ACCURA 7500 , CÁCH SỰE DỤNG , ỨNG DỤNG CHI TIẾT NHẤT

ACCURA 7500
Integrated Digital Protection Relay
+ High Accuracy Power Meter

User Guide[English]
Revision 6.00 2019/5/27



Accura 7500 User Guide

Notice

Notice
Symbol
Caution
Indicates the presence of dangerous voltage which can cause electrical shock, severe injury or
death to persons if proper precautions are not followed.

Caution
Alerts the user to the presence of hazards which can cause somewhat injury to persons, loss to
property or damage to the device itself, if proper precautions are not followed.

Note
Indicates the user’s attention to installation, operating and maintenance instructions.

Indicates alternative voltage or current.
Indicates direct voltage or current.

Installation Considerations
Installation and operation of Accura 7500 should be performed only by qualified, competent personnel that

have appropriate training and experience with high voltage and current devices.

Caution
During installation or use of this product, careless handling of hazardous voltage in field may result in
severe injury or death to user.



During normal operation of Accura 7500, hazardous voltages always exists on the terminal strips
connecting PT/CT, digital input, power supply, external I/O circuit power. The PT/CT secondary can generate
a deadly voltage/current due to energy on the primary side.



Standard safety precautions are as followed while performing any installation or service work [eg, removing
PT fuses, shorting CT secondaries, etc].



Do not access to terminal strips of Accura 7500 after installation.



External CT secondary should not be open.

ⓒ 2006 Rootech Inc. All Rights Reserved

Page 3

Notice

Accura 7500 User Guide

Caution
Failure to observe the following instructions may result in serious damage to the device.



Do not apply Accura 7500 to voltages and currents that exceed input ratings of PT and CT



To use the device in the other way than specified by manufacturer can cause severe damage.



Connect the chassis ground terminal of the device to the earth ground to protect device from noise and
surge. Otherwise, the warranty is not guaranteed.



Terminal screw torque is as followed.
- barrier-type voltage terminal: 1.35 N∙m (14 kgf∙cm = 1.00 lbf∙ft) max.
- barrier-type digital inputs/digital output terminal: 0.90 N∙m (9 kgf∙cm = 0.66 lbf∙ft) max.

About Manual
Rootech Inc. reserves the right to make changes in the device specifications shown in this User Guide without
notice. Rootech Inc. always recommends that customers review the latest specifications for their manuals and
specifications before ordering the product..

In the absence of written agreement to the contrary, Rootech Inc. assumes no liability for applications
assistance, customer’s system design, or infringement of patents or copyrights of third parties by or arising
from the use of devices described herein.

The information contained in this document is believed to be accurate at the time of publication, however,
Rootech Inc. assumes no responsibility for any errors which may appear here and reserves the right to make
changes without notice.

Limitation of Liability
Where applicable law allows and does not prohibit or restrict such limitation, the Rootech, Inc’s liability for
anything relating to this product shall be limited to the price paid for the product.

Page 4

ⓒ 2006 Rootech Inc. All Rights Reserved


Accura 7500 User Guide

Warranty

Warranty
For products and software that are sold or licensed by Rootech Inc. during the period from the date of receipt
by you until the present, Rootech warrants only to the original purchaser.

The purchased products shall be substantially free from material defects in material and workmanship by
Rootech for two years from the date receipt by you.

The software itself is provided “as is” without any warranty of any kind.

In order for the original purchaser to make a claim under the warranties described above, the original
purchaser must promptly contact Rootech headquarter. After receiving such notice, Rootech may either in
Rootech’s sole discretion, examine the product at the original purchaser’s site or issue shipping instructions to
the original purchaser to return the relevant product to Rootech for examination at the original purchaser ’s
expense, transportation charges prepaid.

If after examining the product Rootech reasonably confirms that such examined product does not meet the
warranties, then the original purchaser’s sole remedy and Rootech’s sole obligation or liability shall be, at
Rootech’s option, to repair, replace or refund the price paid for that product.

Limitation of Warranty
The Warranty does not apply to uninterrupted or error-free operation of the Product or cover normal wear and
tear of the product or costs caused by the removal, installation, or troubleshooting of the customer's electrical
systems.

The warranty claims for defects caused by any of the following factors are not covered.


Improper use(alteration, accident, misuse, abuse) or Failure to act in accordance with installation, operation
or maintenance instructions



Unauthorized modification, changes or repair attempted



Failure to comply with applicable safety standards & regulations



Damages when transporting or storing



Damages by force majeure, (examples are not necessarily limited : fire, flood, earthquakes, storm damage,
overvoltage & lightning)



If the original identify markings(trade-mark, serial number, etc) have been defaced, altered, or removed

Rootech shall not be liable for any other claim than a claim solely for the breach of one of the above
warranties that is made in accordance with the above described procedures- made by the original purchaser,
ⓒ 2006 Rootech Inc. All Rights Reserved

Page 5


Warranty

Accura 7500 User Guide

its employees, agents, or contractors for any loss, damage, or expense incurred due to, caused by, or related
to any purchased product.

Any technical assistance provided by Rootech's personnel or representatives in system design shall be deemed
to be a proposal and not a recommendation. The responsibility for determining the feasibility of such
proposals lies with the original purchaser and should be tested by the original purchaser.

It is the original purchaser’s responsibility to determine the suitability of any product and associated
documentation for its purposes. The original purchaser acknowledges that 100% "up" time is not realizable
because of possible hardware or software defects. The original purchaser recognizes that such defects and
failures may cause inaccuracies or malfunctions.

Only the terms expressed in these limited Warranties shall apply and no distributor, corporation or other entity,
individual or employee of Rootech or any other entity is authorized to amend, change or extend the Warranties
in any way.

Standard Compliance

PROCESS CONTROL EQUIPMENT
E324900

MSIP-REM-RTE-Accura 7500

QMS-1347

Page 6

KAB-QC-09

ⓒ 2006 Rootech Inc. All Rights Reserved


Accura 7500 User Guide

Revision History

Revision History
The following versions of Accura 7500 User Guide have been released.

Revision

Date

Description

Revision 1.0

2006. 05. 02

Initial draft

Revision 1.1

2007. 03. 06

Revision

Revision 1.2

2007. 07. 01

Wiring diagram changed

Revision 1.3

2008. 12. 30

Applied from Relay Ver2.11
DI input is connected to output as DO

Revision 3.0

2010. 03. 03

OVGR, UVR, SGR multi-stage configuration possible

Revision 5.0

2010. 12. 01

Motor Protection element added
Manual revision number is same as ‘Protection Relay’ Software version
For Software Version 5.0 or less, please refer to User's Manual Revision 3.0.



Revision 5.1

2012. 07. 09

Table 9.2

value added

Revision 5.2

2013. 02. 27

Table 9.1 Change of K value of LI Curve and accordingly Table 9.6 Timetable
contents changed

Revision 5.3

2013. 03. 08

Cautions related to SGR MTA configuration added[page 123]

Revision 5.4

2013. 03. 15

Wiring diagram changed[page 45 ~ 47]
Inverse time LI characteristic table error changed[page 182]

Revision 5.5

2014. 03. 17

F / W Ver. From 5.07 Motor Protection function Added explanation about
changing Ip reflection method of THR[page 28, 110, 191]
CB ON, OFF Cautions when wiring control signal[page 44, 204]

Revision 5.6

2016. 03. 22

Inverse time LI characteristic curve error correction [page 183]

Revision 5.9

2016. 10. 24

Added description of F/W Version reflecting inverse time LI characteristic curve
change [Table 9.1 Note]

Revision 6.0

2019. 05. 27

ⓒ 2006 Rootech Inc. All Rights Reserved

Overall Format Change

Page 7


Contents

Accura 7500 Guide

Contents
Chapter 1. Introduction..................................................................................................................................... 17
Overview ....................................................................................................................................................... 17
Features ......................................................................................................................................................... 18
Application..................................................................................................................................................... 19
Chapter 2. Technical Specification ...................................................................................................................... 20

Protection Relay .............................................................................................................................................. 20
Measurement ................................................................................................................................................. 26
Measurement Test ........................................................................................................................................... 27
Reliability Test ................................................................................................................................................. 28
Control .......................................................................................................................................................... 29
Input & Output ............................................................................................................................................... 30
Communication ............................................................................................................................................. 31
User Interface ................................................................................................................................................. 31
Others ........................................................................................................................................................... 32
Related Compliance ....................................................................................................................................... 32
Chapter 3. Product Installation........................................................................................................................... 33
Installation Conditions .................................................................................................................................... 33
Before Installation........................................................................................................................................... 33
Dimension .............................................................................................................................................. 34
Step 1: Panel Mounting ................................................................................................................................... 36
Detachment and assembly of the unit for repair ....................................................................................... 37
Step 2: External Wiring ................................................................................................................................... 38
Wiring diagram example (3P4W 3PTs, 3CTs) ............................................................................................ 39
Wiring diagram example (3P3W 3PTs, 3CTs) ............................................................................................ 40
Wiring diagram example (3P3W 2PTs, 2CTs) ............................................................................................ 41
Rear panel terminal arrangement diagram .............................................................................................. 42
Description of the rear panel terminals..................................................................................................... 43
Block diagram ........................................................................................................................................ 45
Chapter 4. Meter Operation/Setup..................................................................................................................... 46
Display Mode ................................................................................................................................................. 47
Function of Group E LED ......................................................................................................................... 47
Setup Mode.................................................................................................................................................... 50
Reset Mode .................................................................................................................................................... 52
System Mode.................................................................................................................................................. 53
Reactive power calculation method .......................................................................................................... 54

Chapter 5. Operating the Protection Relay .......................................................................................................... 57
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ⓒ 2006 Rootech Inc. All Rights Reserved


Accura 7500 Guide

Contents

LED Display Content ....................................................................................................................................... 58
Key Control .................................................................................................................................................... 59
Entering the Passcode ..................................................................................................................................... 60
LCD Display and Change setup values ............................................................................................................ 61
Chapter 6. Protection Relay Setup and Analysis ................................................................................................... 64
OCR Setup ..................................................................................................................................................... 65
Inverse time OCR .................................................................................................................................... 65
Instantaneous time OCR.......................................................................................................................... 67
NSOCR Setup ................................................................................................................................................ 68
Inverse time NSOCR ............................................................................................................................... 69
Instantaneous time NSOCR ..................................................................................................................... 71
OCGR Setup .................................................................................................................................................. 72
Inverse time OCGR ................................................................................................................................. 72
Definite time OCGR ................................................................................................................................ 74
Instantaneous time OCGR ....................................................................................................................... 75
OVR Setup ..................................................................................................................................................... 76
Definite time OVR ................................................................................................................................... 76
Instantaneous time OVR .......................................................................................................................... 78
NSOVR Setup ................................................................................................................................................. 79
Definite time NSOVR ............................................................................................................................... 80

POR Setup...................................................................................................................................................... 82
Definite time POR ................................................................................................................................... 82
UVR Setup ...................................................................................................................................................... 84
Definite time UVR .................................................................................................................................... 85
Other UVR setup ..................................................................................................................................... 87
Motor Protection Elements Setup ...................................................................................................................... 88
THR ........................................................................................................................................................ 89
Lock ....................................................................................................................................................... 92
Motor start .............................................................................................................................................. 92
Under current ......................................................................................................................................... 94
OVGR Setup................................................................................................................................................... 95
Definite time OVGR................................................................................................................................. 95
Instantaneous time OVGR ....................................................................................................................... 97
SGR Setup ...................................................................................................................................................... 98
Definite time SGR .................................................................................................................................... 99
Fault Reset.................................................................................................................................................... 101
Record (Event record) .................................................................................................................................... 101
Chapter 7. Checking Relay Status .................................................................................................................... 103
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Contents

Accura 7500 Guide

Voltage ........................................................................................................................................................ 104
Current ........................................................................................................................................................ 104
DI status ....................................................................................................................................................... 105

DO status..................................................................................................................................................... 105
Event record ................................................................................................................................................. 105
CB Counter .................................................................................................................................................. 106
Program version ........................................................................................................................................... 107
Passcode ...................................................................................................................................................... 109
Record Deletion ............................................................................................................................................ 111
DIN Setup .................................................................................................................................................... 113
DO Setup ..................................................................................................................................................... 116
DO related with Relay ................................................................................................................................... 118
DO Control .................................................................................................................................................. 122
LCD Setup .................................................................................................................................................... 124
PT Failure(Fault Detection) ............................................................................................................................. 126
CB Failure(Fault Detection) ............................................................................................................................ 129
Protection Blocking Function .......................................................................................................................... 132
Date Setup ................................................................................................................................................... 135
DO related with DI ....................................................................................................................................... 137
Chapter 9. Protection Relay Characteristic ......................................................................................................... 140
Inverse Time Curve Characteristic .................................................................................................................. 140
IEC Curves ........................................................................................................................................... 140
KEPCO Curves...................................................................................................................................... 141
Selective Ground Relay (SGR) Characteristic ................................................................................................... 154
Instantaneous Time, Definite Time Characteristic ............................................................................................ 155
THR Characteristic ........................................................................................................................................ 156
Motor Starting Characteristic ......................................................................................................................... 162
Chapter 10. Setup Examples ........................................................................................................................... 163
Automatic Power Recovery Function Setup ...................................................................................................... 163
UVR Setup ............................................................................................................................................ 163
DIN Setup............................................................................................................................................. 164
Precautions ........................................................................................................................................... 165
APPENDIX A

Design Example ........................................................................................................................ 166

3-Phase 4-Wire ............................................................................................................................................ 166
3-Phase 3-Wire : 3PT, 2CT ............................................................................................................................ 167
3-Phase 3-Wire : Open-Delta, 2CT ............................................................................................................... 168
Sequence Diagram ....................................................................................................................................... 169

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ⓒ 2006 Rootech Inc. All Rights Reserved


Accura 7500 Guide

Contents

Figures
Figure 3.1 Accura 7500 front ................................................................................................................... 34
Figure 3.2 Accura 7500 rear .................................................................................................................... 34
Figure 3.3 Accura 7500 side .................................................................................................................... 35
Figure 3.4 Assembly structure ................................................................................................................... 36
Figure 3.5 Panel assembly method............................................................................................................ 36
Figure 3.6 Panel cutting ............................................................................................................................ 37
Figure 3.7 Detachment of the unit from the chassis .................................................................................... 37
Figure 3.8 Wiring diagram(3P4W 3PTs, 3CTs) ........................................................................................... 39
Figure 3.9 Wiring diagram (3P3W 3PTs, 3CTs) .......................................................................................... 40
Figure 3.10 Wiring diagram (3P3W 2PTs, 2CTs: 3P3O) .............................................................................. 41
Figure 3.11 Rear panel terminal arrangement diagram ............................................................................. 42
Figure 3.12 Block diagram ....................................................................................................................... 45

Figure 4.1 Front panel for display and control ........................................................................................... 46
Figure 4.2 Display group .......................................................................................................................... 47
Figure 4.3 Power signs ............................................................................................................................. 55
Figure 4.4 Apparent power vector diagram ............................................................................................... 55
Figure 5.1 Front panel for display and control ........................................................................................... 57
Figure 5.2 Passcode input screen .............................................................................................................. 60
Figure 5.3 Typing the passcode ................................................................................................................. 61
Figure 5.4 OCR setup initial screen ........................................................................................................... 61
Figure 5.5 Inverse time OCR setup screen ................................................................................................. 62
Figure 5.6 Screen with a partial cursor in the setup selection value when the setup value is changed ............ 62
Figure 5.7 Screen with a partial cursor in the setup numerical value when the setup value is changed .......... 62
Figure 5.8 Screen with asking for final confirmation................................................................................... 63
Figure 5.9 Screen with notifying that change is complete ............................................................................ 63
Figure 5.10 Screen with notifying that change is cancelled ......................................................................... 63
Figure 6.1 Protection relay part ................................................................................................................. 64
Figure 6.2 OCR setup initial screen ........................................................................................................... 65
Figure 6.3 Inverse time OCR setup screen ................................................................................................. 65
Figure 6.4 Status where the partial cursor appears for change ................................................................... 66
Figure 6.5 Status in which ‘ENTER’ key was pressed after changing setup items........................................... 66
Figure 6.6 Confirmation of setup value change ......................................................................................... 67
Figure 6.7 Notifying change is completed ................................................................................................. 67
Figure 6.8 Notifying change is cancelled ................................................................................................... 67
Figure 6.9 Instantaneous time OCR setup screen ....................................................................................... 68
Figure 6.10 NSOCR setup initial screen .................................................................................................... 68
ⓒ 2006 Rootech Inc. All Rights Reserved

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Contents

Accura 7500 Guide

Figure 6.11 Inverse time NSOCR setup screen ........................................................................................... 69
Figure 6.12 Status where the partial cursor appears for change ................................................................. 70
Figure 6.13 Status in which ‘ENTER’ key was pressed after changing setup items......................................... 70
Figure 6.14 Confirmation of setup value change ....................................................................................... 70
Figure 6.15 Notifying change is completed ............................................................................................... 71
Figure 6.16 Notifying change is cancelled ................................................................................................. 71
Figure 6.17 Instantaneous time NSOCR setup screen ................................................................................ 71
Figure 6.18 OCGR setup initial screen ...................................................................................................... 72
Figure 6.19 Inverse time OCGR setup screen ............................................................................................ 72
Figure 6.20 Status where the partial cursor appears for change ................................................................. 73
Figure 6.21 Status after setup item is changed and ‘ENTER’ key is pressed .................................................. 73
Figure 6.22 setup value change confirmation screen ................................................................................. 74
Figure 6.23 Notifying change is completed ............................................................................................... 74
Figure 6.24 Notifying change is cancelled ................................................................................................. 74
Figure 6.25 Definite time OCGR setup screen ........................................................................................... 74
Figure 6.26 Instantaneous time OCGR setup screen .................................................................................. 75
Figure 6.27 OVR setup initial screen ......................................................................................................... 76
Figure 6.28 Definite time OVR setup screen............................................................................................... 76
Figure 6.29 Status where the partial cursor appears for change ................................................................. 77
Figure 6.30 Status in which ‘ENTER’ key was pressed after changing setup items......................................... 77
Figure 6.31 Setup value change confirmation screen ................................................................................. 78
Figure 6.32 Notifying change is completed ............................................................................................... 78
Figure 6.33 Notifying change is cancelled ................................................................................................. 78
Figure 6.34 Instantaneous time OVR setup screen ..................................................................................... 78
Figure 6.35 OVR setup initial screen ......................................................................................................... 79
Figure 6.36 Definite time NSOVR setup screen .......................................................................................... 80
Figure 6.37 Status where the partial cursor appears for change ................................................................. 80

Figure 6.38 Status in which ‘ENTER’ key was pressed after changing setup items......................................... 81
Figure 6.39 Setup value change confirmation screen ................................................................................. 81
Figure 6.40 Notifying change is completed ............................................................................................... 81
Figure 6.41 Notifying change is cancelled ................................................................................................. 81
Figure 6.42 POR setup initial screen.......................................................................................................... 82
Figure 6.43 Definite time POR setup screen ............................................................................................... 82
Figure 6.44 Status where the partial cursor appears for change ................................................................. 83
Figure 6.45 Status in which ‘ENTER’ key was pressed after changing setup items......................................... 83
Figure 6.46 Setup value change confirmation screen ................................................................................. 84
Figure 6.47 Notifying change is completed ............................................................................................... 84
Figure 6.48 Notifying change is cancelled ................................................................................................. 84
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Accura 7500 Guide

Contents

Figure 6.49 UVR setup initial screen .......................................................................................................... 84
Figure 6.50 Definite time UVR setup screen ............................................................................................... 85
Figure 6.51 Status where the partial cursor appears for change ................................................................. 86
Figure 6.52 Status in which ‘ENTER’ key was pressed after changing setup items......................................... 86
Figure 6.53 Setup value change confirmation screen ................................................................................. 87
Figure 6.54 Notifying change is completed ............................................................................................... 87
Figure 6.55 Notifying change is cancelled ................................................................................................. 87
Figure 6.56 Other UVR setup screen ......................................................................................................... 87
Figure 6.57 Setup initial screen of MOTOR protection elements .................................................................. 88
Figure 6.58 THR setup initial screen .......................................................................................................... 89

Figure 6.59 THR setup Last item display screen.......................................................................................... 89
Figure 6.60 Status where the partial cursor appears for change ................................................................. 90
Figure 6.61 After changing the setup item, press the 'ENTER' key ................................................................ 90
Figure 6.62 LCD Screen with Fifth Row Content ......................................................................................... 91
Figure 6.63 Setup value change confirmation screen ................................................................................. 91
Figure 6.64 Notifying change is completed ............................................................................................... 91
Figure 6.65 Notifying change is cancelled ................................................................................................. 91
Figure 6.66 Lock setup initial screen ......................................................................................................... 92
Figure 6.67 Motor Start Protect Element setup Initial Screen........................................................................ 93
Figure 6.68 Low current protection element setup initial screen .................................................................. 94
Figure 6.69 OVGR setup initial screen....................................................................................................... 95
Figure 6.70 Definite time OVGR setup screen ............................................................................................ 95
Figure 6.71 Status where the partial cursor appears for change ................................................................. 96
Figure 6.72 Status in which ‘ENTER‘ key was pressed after changing setup items......................................... 96
Figure 6.73 Setup value change confirmation screen ................................................................................. 97
Figure 6.74 Notifying change is completed ............................................................................................... 97
Figure 6.75 Notifying change is cancelled ................................................................................................. 97
Figure 6.76 Instantaneous time OVGR setup screen ................................................................................... 97
Figure 6.77 SGR setup initial screen .......................................................................................................... 98
Figure 6.78 Definite time SGR setup screen ............................................................................................... 99
Figure 6.79 Status where the partial cursor appears for change ............................................................... 100
Figure 6.80 Status in which ‘ENTER’ key was pressed after changing setup items....................................... 100
Figure 6.81 Setup value change confirmation screen ............................................................................... 100
Figure 6.82 Notifying change is completed ............................................................................................. 100
Figure 6.83 Notifying change is cancelled ............................................................................................... 101
Figure 6.84 Event record initial screen .................................................................................................... 101
Figure 6.85 A screen numbered one lower than the current event record number ..................................... 102
Figure 6.86 The screen after the ‘ENTER’ key is pressed in the event record .............................................. 102
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Contents

Accura 7500 Guide

Figure 6.87 The screen while ‘’ key is pressed in the event record screen ............................................... 102
Figure 7.1 Status initial screen ................................................................................................................ 103
Figure 7.2 Voltage display screen ........................................................................................................... 104
Figure 7.3 Current display screen ........................................................................................................... 104
Figure 7.4 DI status display screen .......................................................................................................... 105
Figure 7.5 DO status display screen ........................................................................................................ 105
Figure 7.6 Event record information display screen .................................................................................. 106
Figure 7.7 CB Counter display screen ..................................................................................................... 106
Figure 7.8 Program version display screen .............................................................................................. 107
Figure 8.1 Setup initial screen ................................................................................................................. 108
Figure 8.2 Passcode setup screen ............................................................................................................ 109
Figure 8.3 Passcode change confirmation partial cursor ........................................................................... 109
Figure 8.4 Current passcode entering screen and the partial cursor .......................................................... 109
Figure 8.5 Passcode mismatch message screen ....................................................................................... 110
Figure 8.6 ‘Passcode Change Completed!’ message screen ..................................................................... 110
Figure 8.7 Record deletion menu screen.................................................................................................. 111
Figure 8.8 Status in which reset can be done ........................................................................................... 111
Figure 8.9 Status where ‘ENTER’ key is pressed after selecting the item to be deleted ................................. 112
Figure 8.10 Setting value change confirmation screen (Confirm deletion of record) ................................... 112
Figure 8.11 Notifying change is completed ............................................................................................. 112
Figure 8.12 Notifying change is cancelled ............................................................................................... 112
Figure 8.13 DIN Setup screen ................................................................................................................. 113
Figure 8.14 Status where change can be done with the partial cursor ....................................................... 114

Figure 8.15 Status in which ‘ENTER’ key was pressed after changing setup items....................................... 115
Figure 8.16 Setup value change confirmation screen ............................................................................... 115
Figure 8.17 Notifying change is completed ............................................................................................. 115
Figure 8.18 Notifying change is cancelled ............................................................................................... 115
Figure 8.19 DO Setup screen ................................................................................................................. 116
Figure 8.20 Status where the partial cursor appears for change ............................................................... 117
Figure 8.21 Status in which ‘ENTER’ key was pressed after changing setup items....................................... 118
Figure 8.22 Setup value change confirmation screen ............................................................................... 118
Figure 8.23 Notifying change is completed ............................................................................................. 118
Figure 8.24 Notifying change is cancelled ............................................................................................... 118
Figure 8.25 DO with Relay setup screen .................................................................................................. 119
Figure 8.26 Status where the partial cursor appears for change ............................................................... 120
Figure 8.27 Status in which ‘ENTER’ key was pressed after changing setup items....................................... 121
Figure 8.28 Setup value change confirmation screen ............................................................................... 121
Figure 8.29 Notifying change is completed ............................................................................................. 121
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Accura 7500 Guide

Contents

Figure 8.30 Notifying change is cancelled ............................................................................................... 121
Figure 8.31 DO control menu screen ...................................................................................................... 122
Figure 8.32 Status where the partial cursor appears for change ............................................................... 123
Figure 8.33 Status were ‘ENTER’ key was pressed after control item change. ............................................. 123
Figure 8.34 LCD setup screen................................................................................................................. 124
Figure 8.35 Status where the partial cursor appears for change ............................................................... 124

Figure 8.36 Status in which ‘ENTER’ key was pressed after changing setup items....................................... 125
Figure 8.37 Setup value change confirmation screen ............................................................................... 125
Figure 8.38 Notifying change is completed ............................................................................................. 125
Figure 8.39 Notifying change is cancelled ............................................................................................... 125
Figure 8.40 PT Failure function setup screen ............................................................................................ 126
Figure 8.41 Status where the partial cursor appears for change ............................................................... 127
Figure 8.42 Status in which ‘ENTER’ key was pressed after changing setup items....................................... 127
Figure 8.43 Setup value change confirmation screen ............................................................................... 127
Figure 8.44 Notifying change is completed ............................................................................................. 127
Figure 8.45 Notifying change is cancelled ............................................................................................... 128
Figure 8.46 CB Failure setup screen........................................................................................................ 129
Figure 8.47 Status where the partial cursor appears for change ............................................................... 130
Figure 8.48 Status in which ‘ENTER’ key was pressed after changing setup items....................................... 130
Figure 8.49 Setup value change confirmation screen ............................................................................... 130
Figure 8.50 Notifying change is completed ............................................................................................. 131
Figure 8.51 Notifying change is cancelled ............................................................................................... 131
Figure 8.52 Protection blocking function setup screen .............................................................................. 132
Figure 8.53 Status where the partial cursor appears for change ............................................................... 133
Figure 8.54 Status in which ‘ENTER’ key was pressed after changing setup items....................................... 133
Figure 8.55 Setup value change confirmation screen ............................................................................... 134
Figure 8.56 Notifying change is completed ............................................................................................. 134
Figure 8.57 Notifying change is cancelled ............................................................................................... 134
Figure 8.58 Date Setup screen ................................................................................................................ 135
Figure 8.59 Status where the partial cursor appears for change ............................................................... 136
Figure 8.60 Status in which ‘ENTER’ key was pressed after changing setup items....................................... 136
Figure 8.61 Setup screen for DO related with DI...................................................................................... 137
Figure 8.62 Status where the partial cursor appears for change ............................................................... 138
Figure 8.63 Status in which ‘ENTER’ key was pressed after changing setup items....................................... 138
Figure 8.64 Setup value change confirmation screen ............................................................................... 139
Figure 8.65 Notifying change is completed ............................................................................................. 139

Figure 8.66 Notifying change is cancelled ............................................................................................... 139
Figure 9.1 IEC Curve A .......................................................................................................................... 143
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Contents

Accura 7500 Guide

Figure 9.2 IEC Curve B ........................................................................................................................... 145
Figure 9.3 IEC Curve C .......................................................................................................................... 147
Figure 9.4 IEC Curve LI .......................................................................................................................... 149
Figure 9.5 KEPCO Normal Inverse .......................................................................................................... 151
Figure 9.6 KEPCO Very Inverse ............................................................................................................... 153
Figure 9.7 SGR operation characteristic .................................................................................................. 154
Figure 9.8 THR Thermal Curve ............................................................................................................... 156
Figure 10.1 UVR setup initial screen ........................................................................................................ 163
Figure 10.2 Definite time UVR setup screen ............................................................................................. 163
Figure 10.3 DIN setup screen ................................................................................................................. 164
Figure 10.4 Setup screen for Power recovery CB input channel ................................................................. 164

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Accura 7500 User Guide

Chapter 1. Introduction

Chapter 1. Introduction
Overview
Specialized functions for essential relay elements
Accura 7500 performs general feeder and motor protection of high-voltage consumers, and easy operation
and setup of equipment by using operation key grouped by relay element.

Convenient structure with the meter separated from the relay
Accura 7500 has a power meter function completely separated from the protection relay both structurally and
by design. As the meter function is placed on the left-hand side of the front of the relay and the protection
relay function is placed on the right-hand side of the front of the relay, these are precluded any human
concern by having separate operating keys.

Easy control
Accura 7500’s meter function has the same control interface as Accura digital meters [3300, 3500], so a user
experienced with a digital meters can easily handle it. The protection relay function displays English characters
on the LCD screen so that the relay status can be easily checked and handled, and each relay element comes
with an independent selection key for quick access to the setup menu [screen].

Reliability
In order to monitor the malfunction inside the device, Accura 7500 is equipped with redundancy structure in
which the DSP responible for the meter function and the DSP responsible for the protection relay function
monitor each other. In addition, Accura 7500 meets IEC60255-22 EMS test and IEC61010 to guarantee the
reliability and stability of the product.

Measurement accuracy and power quality
Accura 7500’s meter function can perform 0.2% high-accuracy measurement for voltage and current, and the
power/energy meets the IEC 62053-22 Class 0.5S specification, providing accurate power measurement
information. In addition, it provides power quality information including voltage/current THD, harmonics

analysis and k factor.

ⓒ 2006 Rootech Inc. All Rights Reserved

Page 17


Chapter 1. Introduction

Accura 7500 User Guide

Features
Protection relay


27, 37, 46, 47, 48, 50, 51, 50G, 51G, 51LR, 59, 64G, 67G



Measurement accuracy: Full scale ± 1.0%[100V, 5A]



Timing Accuracy: within ± 5.0% or ± 35ms



Protection relay based on filtered fundamental component in voltage and current inputs



32 sampling/cycle



Real-time protection per every sampling



Event time analysis resolution: 1msec



Event recording

Measurement


64 sampling/cycle True RMS measurement



IEC 62053-22 Class 0.5S



60Hz or 50Hz supported



Phase voltage(Phase-to-neutral voltage), line-to-line voltage(Phase-to-Phase voltage), current



Power, energy, power factor, frequency



Fundamental and True RMS measurement of current



Quadrature power



Demand measurement, Peak demand



Maximum value, minimum value

Power quality


Voltage/current THD



Harmonics analysis



K factor 1

1

1

Data acquisition through RS485 communication is possible.

Power supply

Page 18



AC 85 ~ 265V, 50/60Hz



DC 100 ~ 300V



Power consumption: 20VA/Max 25VA

ⓒ 2006 Rootech Inc. All Rights Reserved

Accura 7500 User Guide

Chapter 1. Introduction

Application
For high voltage consumer only
Accura 7500 performs general feeder and motor protection for high-voltage consumers.

A power meter in a relay device
Accura 7500 completely separates the power meter function included in the relay from the protection relay
from design and construction. The meter function is placed on the left-hand side of the front of the relay and
the protection relay is on the right-hand side, with their functions separated for convenience of operation. This
removes the burden on the user of human error when operating a product that has meter and relay functions
not functionally separated.

High-accuracy power measurement
For higher accuracy in measurement, Accura 7500 uses a separate measurement CT for power measurement,
apart from the CT for the relay. This resolves the problem of degradation of measurement accuracy when one
CT is shared by the relay and the measurement module.

True RMS measurement robust to harmonics
Today’s power usage environments are composed of nonlinear loads-industrial loads, rectifiers, power
electronic devices, electric furnaces, and so on that induce harmonics. This causes severe distortion due to
harmonics in the voltage and current waveforms. Accura 7500 performs accurate True RMS measurement for
voltage and current waves distorted by harmonics.

Power quality analysis
Accura 7500 can analyze 2nd to 31th harmonics as well as harmonic distortion factors of voltage and current,
and provides K factors.

Electrical energy management with high reliability
Electrical energy managenet, in conjunction with higher-level programs, is specified by various application
services such as monitoring, cost management, power demand management, power equipment replacement
and electrical energy planning. Here, the most important factor determining the data reliability of electrical
energy management is the accuracy of measurement data. Accura 7500 provides 0.2% high-accuracy
measurement of voltage and current, and the power/energy meets the IEC62053-22 Class 0.5S specification,
enabling the implementation of an accurate electrical energy management system.

ⓒ 2006 Rootech Inc. All Rights Reserved

Page 19


Chapter 2. Specification

Accura 7500 User Guide

Chapter 2. Technical Specification
Protection Relay
Overcurrent relay inverse time OCR(51P)
Item

Range

Current

Fundamental component of phase current (harmonics and DC offset removal)

Rated current

5A

Operation setting range

0.5 ~ 12.00A by the step of 0.01A

Operating time setting range

0.05 ~1.20 by the step of 0.01 (level: time multiplier)

Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation characteristic curve

IEC(A, B, C, LI), KEPCO(NI, VI)

Operation time accuracy

The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level

Overcurrent relay Instantaneous time OCR(50P)
Item

Range

Current

Fundamental component of phase current (harmonics and DC offset removal)

Rated current

5A

Operation setting range

1.00 ~ 99.99A by the step of 0.01A

Operating time setting range

0.05 ~ 60.00 s by the step of 0.01 s, 0.05s: Instantaneous time operation
More than 0.05s: Definite time operation

Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation time accuracy (Definite

The greater value between ± 5% of setting operation time and 35ms at over 1.05

time)

times of pickup level

Operation time accuracy

Within 50ms

(Instantaneous time)

Negative sequence overcurrent relay inverse time NSOCR(46)
Item

Range

Current

Negative sequence current of 3 phase current (harmonics and DC offset removal)

Rated current

5A

Operation setting range

0.5 ~ 4.00A by the step of 0.01A

Operating time setting range

0.05 ~ 1.20 by the step of 0.01 (level: time multiplier)

Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation characteristic curve

IEC(A, B, C, LI), KEPCO(NI, VI)

Operation time accuracy

The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level

Page 20

ⓒ 2006 Rootech Inc. All Rights Reserved


Accura 7500 User Guide

Chapter 2. Specification

Negative sequence overcurrent relay instantaneous time NSOCR(46I)
Item

Range

Current

Negative sequence current of 3 phase current (harmonics and DC offset removal)

Rated current

5A

Operation setting range

0.10 ~ 50.00A by the step of 0.01A

Operating time setting range

0.05 ~ 60.00s by the step of 0.01 s, 0.05s: Instantaneous time operation
More than 0.05s: Definite time operation

Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation time accuracy (Definite

The greater value between ± 5% of setting operation time and 35ms at over 1.05

time)

times of pickup level

Operation time accuracy

Within 50ms

(Instantaneous time)

Overcurrent ground relay inverse time OCGR(51G)
Item

Range

Current

Fundamental component of ground current (harmonics and DC offset removal)

Rated current

5A

Operation setting range

0.10 ~ 2.50A by the step of 0.01A

Operating time setting range

0.05 ~ 1.20 by the step of 0.01 (level: time multiplier)

Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation characteristic curve

IEC(A, B, C), KEPCO(NI, VI) : 2 OCGR inverse time elements can be set

Operation time accuracy

The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level

Overcurrent ground relay definite time OCGR(51G)
Item

Range

Current

Fundamental component of ground current (harmonics and DC offset removal)

Rated current

5A

Operation setting range

0.10 ~ 2.50A by the step of 0.01A

Operating time setting range

0.05 ~ 60.00 s by the step of 0.01 s

Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation time accuracy

The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level

Overcurrent ground relay instantaneous time OCGR(50G)
Item

Range

Current

Fundamental component of ground current (harmonics and DC offset removal)

Rated current

5A

Operation setting range

1.0 ~ 50.00A by the step of 0.01A

ⓒ 2006 Rootech Inc. All Rights Reserved

Page 21


Chapter 2. Specification

Accura 7500 User Guide

Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation time accuracy

Within 50msec

Overvoltage relay definite time and instantaneous time OVR(59P)
Item

Range

Voltage

Fundamental component of phase voltage or phase-to-phase voltage (harmonics
and DC offset removal)

Rated voltage

110V, 63.5V

Operation setting range

60 ~ 270V by the step of 1V

Operating time setting range

0.05 ~ 60.00 s by the step of 0.01 s

(Definite time)
Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation characteristic curve

Definite time, instantaneous

Operation time accuracy (Definite

The greater value between ± 5% of setting operation time and 35ms at over 1.05

time)

times of pickup level

Operation time accuracy

Within 50msec

(Instantaneous time)

Negative sequence overvoltage relay definite time NSOVR(47)
Item

Range

Voltage

Fundamental component of negative sequence voltage calculated by 3 phase
voltage (harmonics and DC offset removal)

Rated voltage

110V, 63.5V

Operation setting range

5 ~ 110V by the step of 1V

Operating time setting range

0.05 ~ 60.00 s by the step of 0.01 s

(Definite time)
Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation characteristic curve

Definite time

Operation time accuracy (Definite

The greater value between ± 5% of setting operation time and 35ms at over 1.05

time)

times of pickup level

Phase-out relay definite time POR(47P)
Item

Range

Voltage

Fundamental component of phase voltage or phase-to-phase voltage (harmonics
and DC offset removal)

Change characteristic

3-phase voltage(phase-to-neutral voltage) unbalance ratio[%]
= ((Vmax – Vmin) / Vaverage) x 100

Operation setting range

Page 22

5 ~ 100% by the step of 1%

ⓒ 2006 Rootech Inc. All Rights Reserved


Accura 7500 User Guide

Chapter 2. Specification

Operating time setting range

0.05 ~ 60.00 s by the step of 0.01 s

Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation time accuracy

The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level

Under-voltage relay definite time and instantaneous time UVR(27P)
Item

Range

Voltage

Fundamental component of phase voltage(phase-to-neutral voltage) or phase-tophase voltage (harmonics and DC offset removal)

Rated voltage

110V, 63.5V

Operation setting range

20 ~ 220V by the step of 1V

Operating time setting range

0.05 ~ 60.00 s by the step of 0.01 s

(Definite time)
Minimum operation voltage setting

0 ~ 50V by the step of 1V

range
Operation condition

OR (under voltage on one or more phases), AND (under voltage on all 3-phases)
CB OFF (operation regardless of CB status), CB ON (only when CB status is ON)

Reset level

103% of pickup level

Measurement accuracy

1.0% (F.S)

Operation characteristic curve

Definite time, Instantaneous time : 3 UVR elememts for various settings

Operation time accuracy (Definite

The greater value between ± 5% of setting operation time and 35ms at over 1.05

time)

times of pickup level

Operation time accuracy

Within 50msec

(Instantaneous time)

Thermal overcurrent THR(49)
Item

Range

Current

Fundamental component of phase current (harmonics and DC offset removal)

Rated current

5A

Rated motor[Im]

0.50 ~ 15.00A by the step of 0.01A

k constant

1.00 ~ 1.50 by the step of 0.01

Time Tau (Heat Rise Time)

1 ~ 60min by the step of 1min

Previous Load Current: Ip

Under F/W Ver. 5.06 : 0.00 ~ 1.00 x Im by the step of 0.01
From F/W Ver. 5.07 : No Setting. Automatically calculate and reflect driving
history

Reset method

Definite time

Cooling TC(Running)

1 ~ 6,000s by the step of 1s

Cooling TC(Stopped)

1 ~ 6,000s by the step of 1s

Reset level

97% of pickup level

Operation time accuracy

The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level

ⓒ 2006 Rootech Inc. All Rights Reserved

Page 23


Chapter 2. Specification

Accura 7500 User Guide

Motor overload inverse time LOCK(51LR)
Item

Range

Current

Fundamental component of phase current (harmonics and DC offset removal)

Rated current

5A

Rated motor[Im]

0.50 ~ 10.00A by the step of 0.01A

Operation setting range

1.00 ~ 20.00 x Im by the step of 0.01

Operating time setting range

0.05 ~ 60.00 s by the step of 0.01s

Reset Time

Instantaneous time

Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation time accuracy

The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level

Motor starting protection overcurrent(48, 51S)
Item

Range

Current

Fundamental component of phase current (harmonics and DC offset removal)

Rated current

5A

Rated motor[Im]

0.50 ~ 10.00A by the step of 0.01A

Accepted starting current[Tab] setting

1.00 ~ 20.00 x Im by the step of 0.01

range
Accepted starting time setting range

0.1 ~ 600.0s by the step of 0.1s

Start detection current setting range

0.10 ~ 0.80 x Tab by the step of 0.01

51L Interlock

Selects whether to 51L Interlock in start interval

51G, 50G Interlock

Selects whether to 51G and 50G Interlock in initial start interval

Reset level

97% of pickup level

Operation time accuracy

The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level

Under-current definite time UCR(37)
Item

Range

Voltage

Fundamental component of phase current (harmonics and DC offset removal)

Rated voltage

5A

Operation setting range

0.10 ~ 5.00A by the step of 0.01A

Operating time setting range

0.1 ~ 600.0 s by the step of 0.1s

Motor running status detection

CB On status or starting condition of relay element 48

method selection
Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation time accuracy

The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level

Page 24

ⓒ 2006 Rootech Inc. All Rights Reserved

Accura 7500 User Guide

Chapter 2. Specification

Overvoltage ground definite time and instantaneous time OVGR(64G)
Item

Range

Voltage

Fundamental component of zero-sequence voltage

Rated voltage

190V, 110V

Operation setting range

10 ~110V by the step of 1V

Operating time setting range

0.05 ~ 60.00 s by the step of 0.01 s

(definite time)
Reset level

97% of pickup level

Measurement accuracy

1.0% (F.S)

Operation characteristic curve

Definite time, instantaneous time

Operation time accuracy (Definite

The greater value between ± 5% of setting operation time and 35ms at over 1.05

time)

times of pickup level

Operation time accuracy

Within 50msec

(Instantaneous time)

Selective ground relay definite time SGR(67G)
Item

Range

Current

Fundamental component of zero-sequence current (harmonics and DC offset
removal)

Rated current

1.5 mA

Rated voltage

190V, 110V

Operation setting range

0.2 ~ 10.0 mA by the step of 0.1 mA

Reference voltage setting range

10 ~ 110V by the step of 1V

Reference phase-angle setting range

0°~ 359° by the step of 1°
The phase-angle setting can be set only in 2 SGR, and there is no phase-angle
setting in GR.

Operating time setting range

0.05 ~ 60.00 s by the step of 0.01 s

Reference voltage

Fundamental component of zero-sequence voltage (harmonics and DC offset
removal)

Reset level

97% of pickup level

Phase-angle accuracy

2°

Operation time accuracy

The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level

ⓒ 2006 Rootech Inc. All Rights Reserved

Page 25