Measuring Unit Tests - GE LPS-D Instruction Manual

5.2 MEASURING UNIT TESTS

5.2 MEASURING UNIT TESTS
The Fault Detector responds to sudden changes in current levels. Slow changes are not picked up.
1. Connect the relay as shown in Figure 4–3: PHASE TO GROUND TEST CONNECTIONS on page 4–14.
2. Set the relay into test mode 38 (the fault detector). The relay displays
FAULT DETECTOR ON
3. Settings:
Z1DISTANCE
(101)
(104)
Z2DISTANCE
(201)
(204)
Z3DISTANCE
(301)
(304)
Z4DISTANCE
(401)
5
(405)
OVERCURRENT
(605)
(610)
4. Set the voltages as follows:
VA = 67 V rms ∠0°
VB = 67 V rms ∠–120°
VC = 67 V rms ∠+120°
5. Slowly increase I
rent to 0 A. The A1 contact should not close.
6. Immediately increase I
7. Immediately increase I
8. Reduce I to 0.
op
5-
2
Z1PHASE = NO
Z1GROUND = NO
Z2PHASE = NO
Z2GROUND = NO
Z3PHASE = NO
Z3GROUND = NO
Z4PHASE = NO
Z4GRND = NO
50G = NO
51G = NO
to 1.2 (0.4) A rms, at approximately 0.1 (0.01) A per second. Slowly decrease the cur-
op
to 1.5 (0.3) A rms. The A1 contact should close momentarily.
op
to 2.5 (0.5) A rms. The A1 contact should close until current is removed.
op
LPS-D Line Protection System
5 FUNCTIONAL TESTS (FACTORY SETTINGS)
5.2.1 T1 – FAULT DETECTOR TEST
GE Power Management