Injection Test Setup #2; Ge Multilin 50:0.025 Ground - GE Multilin 489 Instruction Manual

CHAPTER 7: TESTING
7.3.5

Injection Test Setup #2

7.3.6 GE Multilin 50:0.025 Ground Accuracy
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
GENERATOR PHASE SEQUENCE:
In the
S3 DIGITAL INPUTS
BREAKER STATUS:
In the
S6 VOLTAGE ELEMENTS
PHASE REVERSAL TRIP:
ASSIGN TRIP RELAYS:
Apply voltages as per the table below. Verify the operation on voltage
phase reversal
Applied Voltage
Va = 120 V∠0°
Vb = 120 V∠120° lag No Trip
Vc = 120 V∠240° lag
Va = 120 V∠0°
Vb = 120 V∠240° lag Phase Reversal Trip
Vc = 120 V∠120° lag
Set up the 489 device as follows for the GE Multilin HGF Ground Accuracy Test, Neutral
Voltage (3rd Harmonic) Accuracy Test, and the Phase Differential Trip Test.
V C
3 PHASE VARIABLE AC TEST SET
V A
V B
A B C N
NC NC
50:0.25
E10 F10 G9 H9 G10 H10 G3
PHASE a PHASE b PHASE c
GROUND INPUTS
FIGURE 7–2: Secondary Injection Setup #2
The specification for GE Multilin HGF 50:0.025 ground current input accuracy is ±0.5% of
2 × CT rated primary (25 A). Perform the steps below to verify accuracy.
In the
S2 SYSTEM SETUP
"ABC"
BREAKER STATUS
"Breaker Auxiliary a"
PHASE REVERSAL
"Unlatched"
"1---"
Expected Result
H3 G4 H4 G5 H5 G6
AUTOMATIC CT
SHORTING
BAR
PHASE A PHASE B PHASE C
NEUTRAL END CT's
CURRENT SENSING
menu, set:
menu, set:
Observed Result
A B C N
H6 G7 H7 G8 H8 G2 H1 H2 G1
PHASE
VOLTAGE INPUTS
OUTPUT CT's
808817A1.CDR
menu, set:
7–15