Application Of Settings; Setting Example; Description; System Setup - GE G60 Instruction Manual

9 APPLICATION OF SETTINGS

9 APPLICATION OF SETTINGS 9.1SETTING EXAMPLE
This section provides an example of the settings required for an example system configuration. Consider the generator pro-
tection system shown below:
8000 : 5 A
12000 : 240 V
R
"+"
CURRENT INPUTS
8H
Inlet valve
52b
H5a CONTACT INPUT H5a
H5c CONTACT INPUT H5c
CONTACT INPUT H6a
H6a
H6c CONTACT INPUT H6c
H5b COMMON H5b
H7a CONTACT INPUT H7a
H7c CONTACT INPUT H7c
H8a CONTACT INPUT H8a
H8c
CONTACT INPUT H8c
H7b COMMON H7b
H8b SURGE
"–"
Ideally, the CTs should be selected so the generator nominal current is 80 to 85% of CT primary. The following settings are
entered for the example system. The M5 bank and the ground CT input on each of the groups are unused in this example.
The nominal current is given by:
Make the following settings changes in EnerVista UR Setup (or alternately, via the front panel through the

AC INPUTS CURRENT BANK F1
GE Multilin
GENERATOR:
211.765 MVA, 18 kV, ABC
x' = 0.216 pu
d
x = 1.967 pu
d
2
I T capability = 10
2
I capability = 8%
2
Motoring Power = 22000 kW
A
B
C
18900 : 120 V
VOLTAGE INPUTS
DIGITAL INPUTS/OUTPUTS
GE Consumer & Industrial
Multilin
G60
Generator Management Relay
Figure 9–1: G60 SAMPLE SYSTEM
S
212
nom
I -------------------- - ----------------------------------------- -
= =
nom
3V
×
3 18
nom
and the 

SYSTEM SETUP

AC INPUTS
G60 Generator Protection System
GSU:
200 MVA
18 : 138 kV
X = 10%
1
X2
X1
X3
8000 : 5 A
X1
X2
X3
H0
Yd1
CURRENT INPUTS
8F
6G H1a
I
H1 H1b
V
H1c
H2a
I
H2 H2b
V
H2c
H3a
I
H3 H3b
V
H3c
H4a
I
H4 H4b
V
H4c
830712A7.CDR
6
×
10 VA
6800 A
=
3
×
10 V

CURRENT BANK M1

9.1 SETTING EXAMPLE

9.1.1 DESCRIPTION

TX LINE:
138 kV
Z = 15 + j75 ohm
1
H2
H0
H1 H3
H1
A
H2
B
52G 52
H3
C
Trip generator breaker
Trip field breaker
Trip turbine
Alarm
9.1.2 SYSTEM SETUP
(EQ 9.1)
SYSTEM SETUP
menus).
Power
system

9
9-1