Injection Test Setup #3 - GE 489 Instruction Manual

7 TESTING
Apply the values shown in the table below and verify the accuracy and the operation of phase differential element.
View the measured values in:
A2:METERING DATA\CURRENT METERING
or press the button when the trip element is activated.
NEXT
As in Figure 7–2: SECONDARY INJECTION SETUP #2 on page 7–12, I
NOTE
APPLIED CURRENT AS
SHOWN ON 489
= 1000 A ∠0°
I
A
= 1000 A ∠180° lag
I
a
= 1000 A ∠0°
I
A
= 940 A ∠190° lag
I
a
3. Repeat for phases B & C. Rewiring of Figure 7–2: SECONDARY INJECTION SETUP #2 on page 7–12 is required.
GE Power Management
EXPECTED RESULT
DIFFERENTIAL
NO TRIP
PHASE DIFFERENTIAL
TRIP
Figure 7–4: SECONDARY INJECTION TEST SETUP #3
489 Generator Management Relay
7.3 ADDITIONAL FUNCTIONAL TESTING
(test set) = I
A
EXPECTED OBSERVED RESULT
CURRENT
0 A
179 A

7.3.9 INJECTION TEST SETUP #3

and I (test set) = I
A B a
MEASURED
DIFFERENTIAL
CURRENT
7
7-15