Siemens ISGS SG8158-00 User Manual download pdf (Page 70)

Appendix D: Acceptance Test Procedures

64 Siemens Energy & Automation, Inc.

Phase

ABC

Relay times out per Table D.1

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 overcurrent.

Return current to zero and reset timer.

7. Remove control power from relay for five seconds, then restore it.

Trip LED re-illuminates after relay is powered up again.

8. 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.1 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.

ISGS Acceptance Test (continued)

Phase Time Overcurrent (51) Function

isv3o_1.bk : isv3otst.frm Page 64 Wednesday, August 7, 1996 10:51 AM

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Siemens ISGS SG8158-00 User Manual Page 70