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5.3 MEASURING UNIT TESTS
1. Record the following Settings:
59
(1503) PICKUP (Phase-Phase Voltage) =______ V rms
(1504) TIME FAC (Time Factor, K ) = ______ sec.
2. Trip time is calculated using the following equation:
Trip Time
=
K is Setting 1504: TIME FAC, V
Setting 1503: PICKUP. If the value of V
V
is greater than PICKUP for a time equal to Trip Time, the test trip relay will operate.
1
3. Connect relay as shown in Figure 4–8: STANDARD FUNCTIONAL TEST CONNECTIONS on page 4–26.
4. Set up relay in test mode for the 59 function; 59 ON will be displayed on the MMI.
5. Set all current inputs to 0. Apply a signal to all three phases with a positive-sequence phase-phase voltage
equal to PICKUP + 2 =______ V rms. This will cause the test pickup to operate and the test trip will oper-
ate after the Trip Time has expired.
6. Lower the positive-sequence voltage to PICKUP – 2 =______ V rms. This will prevent the test pickup and
the test trip relays from operating.
5
1. Record the following Settings:
81-1U
(1703) SET PNT (Set Point for Min. Frequency)= ______ Hz
(1704) TL8 (Time Delay) = ______ sec.
2. Underfrequency is calculated with the following equation:
Input Frequency < SET PNT
Input Frequency is equal to the frequency in any phase. The unit should pick up when the above equation
is true. The unit should trip TL8 seconds after it has picked up.
3. Connect relay as shown in Figure 4–8: STANDARD FUNCTIONAL TEST CONNECTIONS on page 4–26.
4. Set up relay in test mode for the 81-1U function; 81-1U ON will be displayed on the MMI.
5. Set all current inputs to 0. Set the voltage (rms) inputs to:
VA = 70 V ∠0°
VB = 70 V ∠–120°
VC = 70 V ∠–240°
6. Set the frequency at SET PNT + 0.04 =______ Hz. This will prevent the test pickup and the test trip from
operating.
7. Change the frequency to SET PNT – 0.04 =______ Hz. This will cause the test pickup relay to operate and
the test trip relay will operate TL8 seconds later.
5-
14
K
---------------------------------------------- -
(
⁄
) 1
V
PICKUP
–
1
is the positive-sequence voltage applied phase-to-phase, and PICKUP is
1
is greater than PICKUP, the test pickup will operate. If the value of
1
DGP Digital Generator Protection System
5.3.12 T15: POSITIVE-SEQUENCE OVERVOLTAGE 59
5.3.13 T16: UNDERFREQUENCY UNIT #1 81-1U
5 PERIODIC TESTS
GE Power Management
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