D
Appendix D: Acceptance Test Procedures
ISGS Acceptance Test (continued) | Neutral Time Overcurrent (51N) Function |
Phase
N
6. Relay times out per Table D.2.
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
8. Reset relay target. Trip LED resets.
Repeat the same steps also for Parameter Set B.
Testing may also be done for the user settings following the same procedure.
Table D.2 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.
66 | Siemens Energy & Automation, Inc. |
