7 Acceptance/Protection Function Test Guide
D02706R02.30
L-PRO 4000 User Manual
7-15
21P1 Test Procedure
1. In Relay Control Panel access relay
Metering>Logic>Protection.
Monitor 21P1 Zone 1Trip
2. Apply balanced 3-phase nominal voltages (66.4 V) to the relay terminals.
Ph A: 330, 66.4 V
0
Ph B: 331, 66.4 V
-120
Ph C: 332, 66.4 V
+120
Ph N: 333
3. Connect 3-phase current sources (4.24 A lagging voltages by 80
) to the
relay terminals:
Ph A: 300
– 301,
4.24 A
0
Ph B: 302
– 303, 4.24 A
Ph C: 303
– 304, 4.24 A
Observe 21P1 Trip = Low
4. Simultaneously reduce 3-phase voltages.
At 21.0 to 19.0 V (expect 20.0 V)
21 Trip = High (Note that Contact 1 will probably close earlier than
21-1 Trip going high, because Z2 and Z3 trip elements are mapped to
the same output contact, and the length of time this fault will be ap-
plied.)
Testing the Zone 1 Phase Time Delay
1. Monitor (Timer Stop) on normally open Output Contact 1 (202 – 203).
2. Set timer to start from 3-phase amp current transition (i.e. current off to on).
3. Apply (keep on) balanced 3-phase voltages (20.0 V) to the relay terminals.
Ph A: 330, 20.0 V
Ph B: 331, 20.0 V
-120
Ph C: 332, 20.0 V
+120
Ph N: 333
4. Apply 3-phase currents from 0 to 5.3 A to start the timer (this is 80% of
Zone 1 Reach = 64% of the line = 12.4 miles).
where
I
min
- Minimum Current setting
I
DeltaSupervision
- Phase difference between any 2-phase currents
(18)
I
min
I
DeltaSupervision
105
percent
3
-----------------------------------------------------------------------------
7.0 1.05
3
------------------------
4.24
amps
=
=
=
Summary of Contents for L-PRO 4000
Page 1: ...L PRO 4000 Transmission Line Protection Relay User Manual Version 2 3 Rev 0...
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Page 252: ...Appendix B IED Settings and Ranges Appendix B 34 L PRO 4000 User Manual D02706R02 30...
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