GE Power Management
DGP Digital Generator Protection System
4-
31
4 ACCEPTANCE TESTS
4.7 PROTECTION TESTS
4
4.7.14 T17: VOLTS/HERTZ OVEREXCITATION TRIP 24T
1.
Settings:
24T
(1404) INV CURV = 1
(1405) INV PU = 1.5
(1406) TIME FAC = 99.99
(1407) INST PU = 1.5
(1408) TL7 = 1
(1409) RESET = 1
2.
Connect relay as shown in Figure 4–8: STANDARD FUNCTIONAL TEST CONNECTIONS on page 4–26.
3.
Set up relay in test mode for the 24T function; 24T ON will be displayed on the MMI.
4.
Set all current inputs to 0. Using a 60 Hz source, set the voltage inputs according to the following table:
5.
Verify that for all tests in the above table, test pickup operates immediately and test trip operates in 1.0 to
1.05 seconds.
6.
Change the following settings:
24T
(1406) TIME FAC = 1
(1408) TL7 = 9.9
7.
Repeat step 4. Verify that for all tests in the above except test trip should now operates in 5.0 to 5.5 sec-
onds.
If this test is repeated, the operate time of the trip contact will change according to how soon
the test is repeated. The trip time can be calculated according to the following equation:
where
T
= the time between successive tests, Original Trip Time = the 5.0 to 5.5 seconds it
originally took to trip the relay, and RESET = Setting 1409. If the time between successive
trips is greater than the RESET time, the relay will trip in the original trip time.
Table 4–8: VOLTAGE INPUTS FOR TEST T17
TEST
PHASE A
PHASE B
PHASE C
MAG.
PHASE
MAG.
PHASE
MAG.
PHASE
A
114 V
0°
69 V
–120°
69 V
–240°
B
69 V
0°
114 V
–120°
69 V
–240°
C
69 V
0°
69 V
–120°
114 V
–240°
NOTE
New Trip Time
T
RESET
--------------------
Original Trip Time
×
=
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