Siemens SG8158-00 manual Appendix D Acceptance Test Procedures

Appendix D: Acceptance Test Procedures

ISGS Acceptance Test			Directional Neutral Time Overcurrent (67N)
(continued)			Function
			(Only Available with Phase-Neutral Connected VTs)
Phase
N
		-increase phase A current in the reverse direction until relay picks up. This should occur at 1.06 x pickup,
		for example, 1.06 A ∠ 180 to phase A,
		1.06 A ∠ 60 to phase B,
		1.06 A ∠ 300 to phase C.
		Pickup LED illuminates.
		Wisdom software records pickup in event log.
		Return current to zero and reset timer.
		Timing
		Apply appropriate value of current in reverse direction for the test. The results match Table D.7.
	6.
		Pickup LED illuminates.
		Display shows PICKUP 67N PN.
		Wisdom software records pickup in event log.
		Relay times out per Table D.7.
	7.
		Trip LED illuminates.

Timer stops as Trip 1 contacts close.

Trip log indicates trip current value and time in pickup.

Wisdom software records trip on directional overcurrent.

Return current to zero and reset timer.

8. Remove control power from relay for five seconds, then restore it. Trip LED re-illuminates after relay is powered up again.

9. Reset relay target. Trip LED resets.

Repeat above steps for phase B and phase C; repeat the same steps also for Parameter Set B. Testing may also be done for each phase at the user settings following the same procedure.

Table D.7 Test Points for Very Inverse Curve Characteristics

Multiple of Pickup	Time Band 2 (seconds)	Time Band 5 (seconds)	Time Band 9.9	(seconds)
2X	3.73	9.30	18.38
4X	0.92	2.27	4.46
8X	0.40	0.96	1.87

Accuracy of the time curve for 2 ≤ I/Ip ≤ 20 is 5% from the defined value, or 30 ms, whichever is greater.

D

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