4-
32
DGP Digital Generator Protection System
GE Power Management
4.7 PROTECTION TESTS
4 ACCEPTANCE TESTS
4
4.7.15 T18: POSITIVE-SEQUENCE OVERVOLTAGE 59
1.
Make the following Settings changes:
59
(1503) PICKUP = 120
(1504) TIME FAC = 1
(1505) CURVE # =1 (not available for DGP***AAA models)
(1506) INST PU = 240 (available on DGP****CA models only)
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 59 function; 59 ON will be displayed on the MMI.
4.
Set all current inputs to 0 A. Using a 60 Hz source set the voltage inputs according to the following table.
5.
The following results should be obtained::
TEST RESULTS
Test A
: Test pickup and test trip do not operate.
Test B
: Test pickup operates immediately and test trip operates in 2.18 to 2.32 seconds.
Test C
: Test pickup operates immediately and test trip operates in 540 to 570 ms (see note below).
For DGP****CA models, the trip time should be approximately 30 ms since the instantaneous unit
should operate before the inverse curve.
Table 4–9: CURRENT INPUTS FOR TEST T18
TEST
PHASE A
PHASE B
PHASE C
MAG.
PHASE
MAG.
PHASE
MAG.
PHASE
A
65 V
0°
65 V
–120°
65 V
–240°
B
100 V
0°
100 V
–120°
100 V
–240°
C
200 V
0°
200 V
–120°
200 V
–240°
NOTE
Summary of Contents for DGP Series
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