7 Acceptance/Protection Function Test Guide
D02706R02.30
L-PRO 4000 User Manual
7-23
The minimum single-phase current required is:
(Remember: Testing single-phase, so need to exceed the greater of
I
phase
and
3I
o
supervision settings; add 5% to ensure the minimum supervision logic is
high for this test):
This element has been set for Quadrilateral characteristic.
21N2 Reactive Test Procedure
1. In Relay Control Panel access relay
Metering>Logic>Protection.
Monitor: 21N2 Zone 2 Pickup
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 single-phase current source to the relay terminals.
Ph A: 300
–
301, 1.58 A
-76.5
Observe 21N2 Pickup = Low
4. Reduce Phase A voltage.
At 17.4 to 19.2 V (expect 18.3 V):
21N2 Pickup = High (After 400 ms: 21N2 Trip = High)
21N2 Resistive Test Procedure
1. In Relay Control Panel access relay
Metering>Logic>Protection.
Monitor: 21N2 Zone 2 Pickup
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 single -phase current source to the relay terminals.
Ph A: 300
–
301, 1.58 A
+3.5
Observe 21N2 Pickup = Low
4. Reduce Phase A voltage.
At 15.6 to 14.2 V (expect 14.9 V).
21N2 Pickup = High
After 400 ms: 21N2 Trip = High
(30)
I
Min
= (Greater of
I
phase
and
3I
o
Supervision)x105% = 1.5x1.05 = 1.58
A
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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