GEX 2000 thuyet minh kich tu

Generator Excitation System Technology and Operation Manual

GEX-2000 Generator Excitation Regulator

Technical documentation

Beijing KeDianYiHeng Electric Power Technology CO., Ltd

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Generator Excitation System Technology and Operation Manual

Contents

1 　 INTRODUCTION............................................................................................................ 1
2 　 FUNCTION DESCRIPTION........................................................................................... 1
2.1 　 MAJOR LOOP
2.2 SYSTEM CONFIGURATION

2

2.3 RECTIFIER BRIDGE

2

2.4 DE-EXCITATION AND OVER-VOLTAGE CIRCUIT
2.4.1 Calculation and choice of de-excitation resistance........................................................................

4
5

2

2.4.2 Rotor over-voltage protection......................................................................................................... 6

2.5 FIELD FLASHING CIRCUIT

6

2.6 　 REGULATOR CONTROL UNIT
6
2.6.1　 Collection of analog quantities.................................................................................................... 6
2.6.2　 Switching value input and output................................................................................................ 7
2.6.3　 Communication.........................................................................................................................

7

2.6.4　 Human-computer interface.........................................................................................................

8

2.6.4.1 　 Keyboard..............................................................................................................................................

8

2.6.4.2 　 LED indicator light................................................................................................................................ 9
2.6.4.3 　 Home screen display............................................................................................................................

9

2.6.4.4 　 Instructions of menu operation.............................................................................................................. 10
2.6.4.5 　 Display measurement............................................................................................................................ 11
2.6.4.6 　 Parameters menu..................................................................................................................................... 12
2.6.4.7 　 Protect switching menu.......................................................................................................................

15

2.6.4.8 　 Input status menu................................................................................................................................

15

2.6.4.9 　 Transmission test menu.......................................................................................................................

16

2.6.4.10 　 System test menu................................................................................................................................

17

2.6.4.11 　 Fault remember menu............................................................................................................................ 17
2.6.4.12 　 Fault wave form menu............................................................................................................................ 18
2.6.4.13 　 Event recording menu............................................................................................................................ 19
2.6.4.14 　 Precision adjustment menu................................................................................................................... 19
2.6.4.15 　 Unit parameter menu............................................................................................................................ 19
2.6.4.16 　 System setup menu................................................................................................................................ 20
2.6.4.17 　 Test option menu..................................................................................................................................... 21
2.6.4.18 　 Other test menu..................................................................................................................................... 22

2.7 　 POWER SUPPLY

22

3 　 OPERATION................................................................................................................ 23
3.1 　 INTRODUCTION OF OPERATION PANEL
3.2 　 OPERATION METHOD

23
24

3.3 　 INCREASE/DECREASE MAGNET OPERATION
3.4 SOFT START

25

3.5 SYSTEM VOLTAGE TRACKING

26

26

3.4 　 NORMAL OPENING STEPS (LOCAL)

26

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Generator Excitation System Technology and Operation Manual

3.5 　 NORMAL CLOSING OPERATION

27

3.9 　 FAULT WARNING AND PROCESSING

27

4 　 MAINTENANCE OF EQUIPMENT.........................................................................
4.1 　 DAILY INSPECTION
4.2 　 MAINTENANCE

28
28
28

5 　 UPPER COMPUTER MONITORING......................................................................... 28
5.1 　 INSTALLATION AND STARTUP

29

5.2 　 CONNECTION TYPE
29
5.2.1　 Single channel............................................................................................................................. 29
5.2.2　 Two-channel................................................................................................................................. 29

5.3 　 SYSTEM SETTING

29

5.4 　 FUNCTIONS

30

6 　 CENTRAL CONTROL DESIGN GUIDELINE........................................................... 35
7 　 TECHNICAL DESCRIPTION OF GEX-2000C/D MICROCOMPUTER
EXCITATION REGULATOR.............................................................................................. 36
7.1 　 UNIT FEATURES
36
7.1.1　 Main features............................................................................................................................. 36
7.1.2　 Operation environment................................................................................................................. 37

7.2 　 MAIN FUNCTIONS AND TECHNICAL CRITERIA
37
7.2.1　 Main functions............................................................................................................................. 37
7.2.1.1 　 Adjustment and control function.........................................................................................................

38

7.2.1.2 　 Limit and protection function..............................................................................................................

38

7.2.1.3 　 Other auxiliary functions....................................................................................................................... 38

7.2.2　 Main technical criteria................................................................................................................. 39
7.2.2.1 　 Analog-digit converter input parameter................................................................................................ 39
7.2.2.2 　 Volume of switching value input/output................................................................................................ 40
7.2.2.3 　 Output parameter................................................................................................................................

40

7.2.2.4 　 Network interface................................................................................................................................

40

7.2.2.5 　 Power supply parameter....................................................................................................................... 40
7.2.2.6 　 Criteria parameter................................................................................................................................

40

7.3 　 PRINCIPAL INTRODUCTION
41
7.3.1　 Main Principal............................................................................................................................. 41
7.3.2　 Single Board Principle................................................................................................................. 42

7.4 SOFTWARE INTRODUCTION
45
7.4.1 Master Scheduler Program............................................................................................................. 45
7.4.2 Interrupt Routine............................................................................................................................. 46

7.5 COMMUNICATION AGREEMENT

50

8 　 PSS TEST METHOD AND STEP................................................................................ 55

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Generator Excitation System Technology and Operation Manual

1　 Introduction
As a product of GEX series of Beijing KeDianYiHeng Electric Power Technology Co., Ltd., GEX2000C/D micro-computer excitation unit is applied in synchronous generators excitation system. It is
designed with single cabinet, featured with compact structure, easy installation and perfect function,
applies to hydro-power generating units and thermal power generating units. The general cabinet size is
800(width)×600(depth)×2260(height).

2　 Function Description
GEX-2000C/D excitation unit is comprised of major loop unit, regulator control unit, power unit and
operating and signal indicating unit.

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Generator Excitation System Technology and Operation Manual

2.1 　 Major loop

2.2 System configuration
Mode

GEX-2000C/D

Config
Exc. Trans

√

Rectifier Bridge

√

Field OV

√

Protction
De-Exc.Circuit

Linear De-Excitation

Field Flash

DC Power

Exc.Regulator

Redundant

Fan

√

2.3 Rectifier Bridge
The three-phase fully-controlled rectifier bridge is composed of six thyristor.

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Generator Excitation System Technology and Operation Manual

Ud is the DC output voltage 　 U2 is the AC input phase-to-phase voltage 　 αis the controlled
angle.
Ud=1.35U2Cosα
Excitation regulator adjust controlled angle α continuously according to generator and busbar conditions.
Three-phase fully-controlled rectifier bridge should be work under three operation conditions,according to
the different controlled ange α.
When 0°<α< 90°,Ud is positive value ,the bridge is under rectifier operation
conditions,and the energy supplied to generator come from the input sides of
rectifier bridge.
When 90°<α< 180°,Ud is negative value ,the bridge is under invertion operation
conditions.the energy of generator field winding discharge gradually.
When α=90° 　 Ud is zero,there are no energy exchange between input and output sides of rectifier
bridge.
The following figure is the wave form with inductive load

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Generator Excitation System Technology and Operation Manual

0

π

2π

3π

4π

ωt

0

π

2π

3π

4π

ωt

0

π

2π

3π

4π

ωt

0

π

2π

3π

4π

ωt

0

π

2π

3π

4π

ωt

用 Fi nePri nt 用 用 - 用 用 www. f i nepri nt. cn 用 用

2.4 De-Excitation and Over-Voltage circuit

The De-exctiation circuit is composed of field current break and linear-resistance. Inverse de-excitation is
used for normal stop operation .If there are some emergency accident, field-current breaker trip
immediately and the residue energy of rotor winding will be released by linear-resistance.
The function of field-current breaker is breaking the rotor excitation current circuit and makeing sure that
residue energy of rotor winding transfer to de-excitation resistance.

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Generator Excitation System Technology and Operation Manual

2.4.1 Calculation and choice of de-excitation resistance
The choice for de-excitation resistance value which refer to rotor winding reverse voltage generated during
the course of de-excitation and the speed of de-excitation is very importance.
The rotor winding voltage during the course of de-excitation calculated according to the following
equation

U fd = Rm I fd
Where:

Rm
I fd

is the de-excitation resistance

is the generator excitation current
The calculation equation for time constant of de-excitation:

T=

Td 0 R f
Rm + R f

Where:

Td 0

is the time constant for rotor winding while stator winding is open.

Rf

is the DC.resistance of rotor winding and can be calculated according to the following equation

Rf =

U fd
I fd

De-excitation resistance value usually calculate as 2.5 R f , in consideration of the insulation of rotor
winding when field-current breaker trip under 2 times force excitation. In this case,the rotor winding
voltage is smaller than 60 percent of winding withstand voltage.the rated current of de-excitation
resistance usually greater than 20 percent of rated excitation current.
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Generator Excitation System Technology and Operation Manual

2.4.2 Rotor over-voltage protection
The non-linear resistance connected to DC side of rectifier bridge in parallel is used for absorbing the
excessive voltage produced by the following reasons:
 Over voltage in DC side of rectifier bridge caused by rapid de-excitation
 Over voltage caused by thunderstrike
 Over voltage caused by closing or opening generator circuit breaker asynchronously
 Over voltage caused by generator short-circuit　under excitation and so on.
Setting rule for the action value of rotor over-voltage protection:

 Less than 75 percent of rotor winding test voltage.
 Less than the most permit voltage of rectifier bridge
 Greater than 2.5 times peak voltage value of excitation transformer secondary side.

2.5 Field flashing circuit
The field flashing power come from DC or AC plant power supply.
Field flashing function have two operation mode, automation and manul.
A binary output singal will be sent out automatically and field flashing contract closed until stator voltage
rise up to 20 percent of rated generator terminal voltage when excitation regulator work as automation
mode. In case the stator voltage can not maintain at the point of 20 percent of rated terminal voltage, a field
flashing failure singnal will be sent.
It is necessary that Pressing the button SB3 when the field flashing mode is manual.In this case, excitation
regulaor operate by manual mode.
Notice:
A. There are no automatic field flashing singal,when excitation regulator operate under manual mode
FCR.In this case, the button SB3 must be press.
B. Excitation current set value is 5 percent of rated no-load excitation current under manual mode.In this
case,if the stator voltage can not hold, it is a suggestion that increasing the excitation current setting
value IFR to 15 percent of rated no-load excitation current.
C. There is a risk that generator voltage and excitation current oscillate in a greater range after changing
excitation current setting value to 15 percent of rated no-load excitation current.At worst, generator
stator voltage could exceed allowable values.
D.It is a suggestion that the manual field-flashing operation pressing the button SB3 is in service as a
backup choice for the above reasons B&C

2.6 　 Regulator Control Unit
GEX-2000C excitation regulator is located inside regulating cabinet, is divided into signal processing,
control computer, signal output, communication and human-computer interface. By collecting various
analog quantities and switching value information of generator unit, through CPU computing and
processing, control silicon controlled rectifier bridge output, reach the purpose of excitation system

control.
2.6.1　 Collection of analog quantities

Measuring PT

Rated value

Terminal strip No.

105V

801:1, 801:3, 801:5

voltage

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Generator Excitation System Technology and Operation Manual

Instrument PT

105V

802:1, 802:3, 802:5

Stator current

5A (1A)

803:1,803:2,803:3 803:6,803:7,803,8

Synchronizing

100V

Directly connect to regulator

Actual value

807: 1, 807: 2

voltage

voltage
Rotor voltage
Rotor current

Collect

form

current

807: 3, 807: 6

divider
2.6.2　 Switching value input and output
Remote central controlled operating excitation unit signal input (common terminal 901: 9)
DI

Terminal strip No.

DI

Terminal strip No.

Excitation On

902: 1

Dec

902: 5

Excitation Off

902:2

Var On

902: 6

Auto/Manu

902: 3

Cos PHI On

902: 7

Inc

902: 4

Channel Selection

902:8

Exciting unit working condition and alerting signal output (common terminal 805: 1)
DO

Terminal strip No.

DO

Terminal strip No.

Channel A automatic

805: 3

Constant reactive operation

805: 13

805: 5

Constant Power Factor

805: 11

805: 7

CHA channel fault

805: 15

805: 9

CHB channel fault

805: 17

operation
Channel A manual
operation
Channel B automatic
operation
Channel B manual
operation
Alerting signal output 　　　　 805 　 23　
DO

Terminal strip No.

DO

Terminal strip No.

Fuse break

805:25

Power Fault

805: 29

Temperature Limit

805: 27

Fan failure

805: 31

2.6.3　 Communication
Serial port 1: RS-

903: 1, 903: 3

485(segregated)
Serial port 2: RS-232

Regulator front panel

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Generator Excitation System Technology and Operation Manual

2.6.4　 Human-computer interface
GEX-2000C microcomputer excitation regulator uses large screen LCD with size of 240*128 for
displaying, the displayer can display 15*8=120 Chinese characters or 30*16=480 characters, uses T6963C
as controller chip, has two display modes of graphic and text. LCD has driven negative supply inside and
backlight and chip power-supply control circuit outside.
LCD is functioned mainly of human-computer interaction interface, including measurement showing,
parameter adjusting, fault display, system setting, combination with keyboard and completion of the above
features. There are 6 LED indicator lights and 10 keys.

2.6.4.1 　 Keyboard

RESET

RETUN

Q

Key
“

”, “

”“

Functions
”,“

”

Current toolbar of choice menus, correspond to up, down, left and
right of cursor, “

”, “

” can also be used for modifying

parameter, correspond to figure increasing and decreasing.
“

”(enter)

Make sure the current operation and go to the next menu, ensuring
the parameter modification. In the initial interface, press “

”

and go to the next main menu interface.
“Q”(back)

Exit the current operation and back to the previous menu, cancel
the parameter modification.

“

”(reset)

Press “reset” and “return” together, carry reset operation for CPU,
strictly prohibit CPU reset in operation, and this will result in
reactive fluctuations.

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Generator Excitation System Technology and Operation Manual

“

”(return)

The key has function of returning unit signal, can return alerting
signal.
They can also be used for parameter modifying, correspond to

“+”, “-”

figure increasing and decreasing.

2.6.4.2 　 LED indicator light
Name
Automatic operation

Function
Light on in automatic operation status

indicator light
Manual operation

Light on in manual operation status

indicator light

PSS operation indicator

Light on in PSS input

light
Constant reactive

Light on in constant reactive operation status

operation indicator light
Constant power factor

Light on in constant power factor operation status

operation indicator light
Channel fault indicator

Light on and keep by itself in unit internal fault or protection movement

light

limitation status, light off after signal return

(Channel alerting
indicator light)
2.6.4.3 　 Home screen display
After starting, the unit automatically enters into home screen to display the system operation status and
main measured data. The corresponding measurement displaying is as follows, all variables are shown as
actual value. (See chart)
Status display area:

This area will display the main working status, including operation mode, which displays the current
operation mode, falls into automatic operation and manual operation. Automatic operation is constant
generator terminal voltage control, while manual operation is constant regulator output current control
because brushless excitation system rotor current can not be measured.

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Generator Excitation System Technology and Operation Manual

Name
UG1

Definition

Name

Three-phase average value of terminal voltage

Definition

P

Active power

Q

Reactive power

(line voltage)

IG1
UFD

Stator three-phase current average value
Exciting voltage of exciter

ARF

Silicon

controlled

angle
IFD

Exciting current of exciter

COSΦ

UGR

In automatic operation, terminal voltage PID

F0

adjust set value
IFR

Power factor
Terminal

voltage

frequency

In manual operation, exciting current set value of

ILD

exciter

The cabinet output
current in two cabinet
current-sharing
operation status

Field suppression switch: with on specific description, field suppression switch is connected with
normal close auxiliary contact; the status is shown as open or closed.
Channel status: the operation status of regulator in the channel. Three cases: operation, track and quit.
Main switch: display the generator is parallel operation or no-load operation. The main switch status
can be distinguished in accordance with parallel breaker open contact.
Operation mode: display the current operation mode, including automatic operation and manual
operation. The automatic operation is constant generator terminal voltage control, while
manual operation is constant regulator output current control.
Date: display date of system.
2.6.4.4 　 Instructions of menu operation
Press “

” in home screen and go to main menu, which uses tree structure, has multilevel submenus. In

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Generator Excitation System Technology and Operation Manual

menu operation, use “

”, “

”“

”, “

” to move cursor, press “

” and go to the

corresponding sub-menu, press “Q” and exit home screen. The main menu is as follows.

2.6.4.5 　 Display measurement
The menu displays the measured data and computed value on screen. Displayed value as follows:

UG1:
UAB1:
UBC1:
UCA1:
I G:
I A:
I B:
I C:

UG2:
UAB2:
UBC2:
UCA2:
UFD:
I FD:

Measurement

I LA:
I LB:
P:
Q:
Cos
F0:
F1:
ARF
URAN:
UPSS:
U5V:
U12V:
H0:
US:

KV
KV
KV
KV
KA
KA

KA
KA
KV
KV
KV
KV
V
A

A
A
MW
Mvar
Hz
Hz
V
V
V
V
%
KV

Name

Definition

UG1

Measured PT three-phase line voltage average
value

UAB1, UBC1, UCA1

Measured PT three-phase line voltage

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Generator Excitation System Technology and Operation Manual

Name

Definition

IG

Stator three-phase current average value

IA, IB, IC

Three-phase stator current

UG2

Instrument PT three-phase line voltage average
value

UAB2, UBC2, UCA2

Instrument PT three-phase line voltage

UFD

Exciting voltage of exciter (output voltage of
excitation unit)

IFD

Exciting current of exciter (output current of
excitation unit)

ILA, ILB

Apply to three-generator brush excitation system;
operate as two-cabinet current-sharing operation,
output current of this cabinet and other cabinet.

P

Active power of generator

Q

Reactive power of generator

COSΦ

Power factor, displayed three decimal places.

F0

Generator terminal voltage frequency

F1

Excitation power supply frequency

ARF

Silicon controlled trigger angle

URAN

Test signal of external stack

UPSS

PSS output, check the signal first when input PSS,
no impact when the signal is zero.

U5V

5V

U12V

12V

H0

Rotor equivalent heat productivity percentage

US

System side voltage

2.6.4.6 　 Parameters menu
In the main menu, move the cursor to parameter, press “
in cursor place by pressing “

”, “

”, press “

”, “

12

”, popup password, input password number
” to move the cursor.


Generator Excitation System Technology and Operation Manual

Password * * * *

After inputting the correct password, press “

Move the cursor and select submenu by “
submenu of parameter, press“

” and go to submenu of parameter.

”, “

”, “

”, press “

” and go to

” again when modify the parameter value, cursor is flashing, select

parameter number place needed modifying through “
”, “

”“

”, “

” (Circulatory change from 0 to 9), then press “

”, modify parameter value using “
” and save modification, press “Q”

back to the previous menu, and give up modification, the displayed value is the original value. The
parameter setup and modification screen is as follow.
Automatic PID parameter setup screen:

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Generator Excitation System Technology and Operation Manual

AUTO PI D Para.
Ke

Kp

1 + T1S
1 + T2S

1 + TeS

1 + T3S
1 + T4S

b

T1=0. 94
T2=9. 4

Kp=3
b=0. 02

T3=0. 5
T4=0. 05

Manual PID parameter setup screen:

MANU PI D Para.

Kp

T1=0. 8
T2=8. 0

1 + T1S
1 + T2S

T3=2
T4=2

Underexcitation limit setup screen

14

1 + T3S
1 + T4S

Kp=6


Generator Excitation System Technology and Operation Manual

U. E. L Li mit er

A: ( 0 , - 18Mvar )
K: 1. 0

B: ( 30MW, 0 )
Ti : 2. 0

2.6.4.7 　 Protect switching menu
The menu will display and set switching status of function switches.
Use “
press “

”, “
”, “

”“

”, “

” to select modifying items. Press “

” to change switching status, then press “

” to enter into modifying status,
” again to complete current item

modification, at the same time the cursor go back to the previous menu. Press “Q” to go back to the
previous menu and give up modification.

2.6.4.8 　 Input status menu
It mainly display on-off of inputting quantities real-time status. Pressing “
page. Pressing “Q” and go back to main menu.

15

”, “

” can turn


Generator Excitation System Technology and Operation Manual

2.6.4.9 　 Transmission test menu
In the main menu, select transmission test item, press “
by “

”, “

”“

”, “

”, press “

and select transmission status, then press “

”, popup submenu, select output channel No

”, move the cursor to “on/off”, press “

”, “

”

” to start test, after test, change transmission status to

“off”. Press “Q” and go back to main menu. See chart.

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Generator Excitation System Technology and Operation Manual

2.6.4.10 　 System test menu

WAVE:
Pu

SYSTEM TEST

1. 0
s

STEP　 + 0 %

TI ME:

0. 0s

START

In this interface, you can carry out step response test and display the chosen variable oscillogram. All
should be displayed as unit value in graphic. Step value can be changed in range of ±20%. The second item
needed to be set is the keeping time of step signal, setting range can be from 0 to 15 seconds, the minimum

resolution is 0.1 second, after choosing start menu, press “

” and step value starts to output, now the

menu shows finished and will start again until 20 seconds recording time. If abnormal situations appear in
the test process, press “

” immediately and step value will be cancelled, the menu shows start again.

After test, select WAVE and press “

”, then it will display recording value, keys “

” and “

” can

change the current recording value UG1, UG2, IG, UFD, IFD, ILA, ILB, P, Q, α, UGREF and IFREF,
totally 12 oscillograms. Press “

” again then will appear a cursor, corresponding point time and current

amplitude in the top right corner (unit value display). Press “
“

” and move right quickly, press “

”, “

” and move left/right slowly, press

” and move left quickly. Press “Q” and exit menu step by step.

This interface needs password for entry.
2.6.4.11 　 Fault remember menu
In fault remember menu, press “
as shown in the graphic, press “

” and go to fault remember submenu. The displayed parameter is
” and “

” to change issue items, maximum 20 items, numbered

from 1, circularly display. Press “Q” to go back to the main menu.

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Generator Excitation System Technology and Operation Manual

FAULT LOG
16: 17: 24: 12
2009- 08- 03
OP MODE:
O. E. L.
Operat i ng Val ue　
UG2:
UG1:
KV
I FD:

UFD:
V
P1:
MW
Q1 :
ARF:
F0 :
UGR:
KV
I FR:
I LA:
I LB:
A
U5V:
U12V:
KV
COS:
H0:
%

1/ 20
KV
A
MVR
Hz
A
A
V
KV

　　

2.6.4.12 　 Fault wave form menu

WAVE:

FAULT WAVE

Pu
1. 0
s

FAUL TNUM:

1/ 0

The wave form shows the same system test, can record 4 groups of wave form totally. After entering into
this menu select NUM menu automatically, the cursor is flashing, press “

” and “

” to select the

group needing observation, now the bottom line appears the recording time and fault type of this group,
select WAVE menu and then observe wave form method the same system test.

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Generator Excitation System Technology and Operation Manual

2.6.4.13 　 Event recording menu

EVENT LOG
01.
02.

09- 01- 11 04: 34: 14: 234
1
FCB
0
09- 04- 21 10: 12: 32: 213
0
FCB
1

2.6.4.14 　 Precision adjustment menu
In the main menu, select precision adjustment item, press “

”, password authentication, after inputting

correct password, enter into submenu, this menu provides software potentiometer function, modifies the
difference between actual measured value and displayed value. Its window is as the chart showing. Modify
the reference constant value of Keyboard operation.

Adj ust Accuracy
UAB1:
UBC1:
UCA1:
IA :

IB :
IC :
UAB2:
UBC2:
UCA2:
USA :
USB :
USC :

0. 998
0. 899
0. 995
0. 998
0. 968
0. 992
0. 998
0. 868
0. 908
1. 000
1. 000
1. 000

UFD:
I FD:
URAN:
AD16:
I LB :
I LA :
U12V:
U5V :

P1 :
Q1 :
U1 :
U2 :

1. 000
1. 030
1. 000
1. 000
1. 000
1. 000
0. 988
0. 976
0. 978
0. 948
1. 000
1. 000

2.6.4.15 　 Unit parameter menu
In the main menu, select unit parameter item, press “
submenu is popup. Operate in accordance with parameter setup.

19

”, after passing password authentication,


Generator Excitation System Technology and Operation Manual

----------Unit Data-----------Rated Ug　

10.5
KV
Rated Ig　 1.24 KA
Rated Ufd　
153 A
Rated Ifd　
5.57 A
No-load Ufd0　
50 V
Rated Ild　
5
A
F_PWR Supply　 400
Hz
2.6.4.16 　 System setup menu
In the main menu, select system setup menu, after passing password authentication, submenu is popup
showing some important information of current unit. See chart below:

Password setting

Set users’ password, which has four digits, when change password, enter the new
one and press “enter”, then password is changed successfully.

Mailing address

Used for 485 mailing address setting, three-digital integer, range is 0-255; ensure
the two channels of which one is odd, the other one is even for two-channel
system.

Baud rate 1

Corresponding baud rate of RS232 communication
Optional value: 9600, 19200, 38400; unit: bps

Baud rate 2

Corresponding baud rate of CAN communication (no need of change, already set
in procedure inside)

DA1 output

Set parameter of DA1 digital-to-analogue conversion

DA output

Set parameter of DA2 digital-to-analogue conversion

Channel setting

Select operation mode, single/double-channel operation

Operation mode

Set main cabinet, subordinative cabinet mode (two-cabinet current sharing), or
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Generator Excitation System Technology and Operation Manual

active-standby mode.

Fault clear

Clear fault record, select “Yes” in this menu, press “enter” and then the fault
record is cleared.

Event clear
Clock setting

Clear the corresponding event record
After selecting this item, press “

”, then move the cursor to date number,

press left/right key to change place value, press up/down key to change numbers.
After changing the date, press “

”, and then the system date is changed

successfully, at the same time the cursor disappears from changing place, goes
back to the previous menu, if you want to give up date changing, press “Q” and
the current system date will be shown.
2.6.4.17 　 Test option menu
In the main menu, select test option menu, press “

”, after passing password authentication,

enter into submenu. There are totally 6 submenus.

----Test Option-----Test Enable　
Enable/Forbid

Test Signal NUM　
0
Test Type　
With CMP/Without CMP/End
PSS Limitation Value　 5%
PSS ON　
30%
PSS OFF　
20%

Test signal enabling

When enter into this menu, the test signal enabling is disabled status, press

item

“enter” to show changing cursor, now you can press up/down key to change to
enabled status, press “enter” again then test signal joins test signal summing
point, if you press cancel key, then changing is invalid, the cursor is canceled.

Test signal summing
point

Set place of test signal summing point
0

voltage set point

1-8 spare
9-27 PSS transfer function summing point.

Note: this function is used only in PSS test, the test signal enabling must be set
as disabled status in normal operation.
Test type

Set test mode having compensation test, uncompensated test and finished
status;
When test type is uncompensated, PSS output is zero, test PID characteristics;
When test type is compensation test, P of PSS output is zero, test signal join,

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Generator Excitation System Technology and Operation Manual

test PSS+PID characteristics;
When test type is finished status, PSS works normally;
Note: in changing test type, first exit PSS, observe the measured displaying
UPSS output, input PSS until UPSS stable output is close to zero.
PSS limiting value

Set the proportion of PSS output corresponding PID output, generally not more
than 10%

PSS input

Set the limiting value of PSS input, as well as when generator active reaches
rated active proportion, input PSS

PSS exit

Set the limiting value of PSS exit, as well as when generator active reaches
rated active proportion, quit PSS

2.6.4.18 　 Other test menu
The following screen appears after entering into the menu
----Other Test-----COST CTR Angle Enable　 Enable/Forbid
COST CTR Angle Set　
150

Constant controlled

In unloaded status of generator, change it to permit, controller output is

angle output enable

constant controlled angle output. This function is only used for test.

Constant controlled

Set controlled angle of constant output, ranged from the maximum controlled

angle output

angle to the minimum controlled angle

2.7 　 Power supply
The system has several levels of working power supply, deriving from different external power supply
Regulator

The regulator uses AC and DC power supply, DC can use DC220V±20% or

working power

DC110V±20%, while AC can use AC220V±15%. DC220V is supplied through air

supply

switch 2QS, AC220V is supplied through air switch 1QS. Both power supply output
in parallel, if one power supply is cut for reason, the other one can make sure the
regulator working normally.

DC control
power
Field flashing
power

Used for excitation unit logic control circuit, generally is DC220V, adopts the same
external power with regulator DC220V working power supply.
Uses DC220V power supply, introduce independently, in the beginning of exciting,
provides exciting energy

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