3.3 OUT OF STEP PROTECTION
Accuracy
Accuracy of zones and timers As per Distance
Operating range Up to 7 Hz
3.4 FIBRE TELEPROTECTION TRANSFER TIMES
The table below shows the minimum and maximum transfer time for InterMiCOM64 (IM64). The times are
measured from opto initialization (with no opto filtering) to relay standard output and include a small propagation
delay for back-back test (2.7 ms for 64 kbits/s and 3.2 ms for 56 kbits/s).
IDiff IM64 indicates InterMiCOM64 signals working in conjunction with the differential protection fibre optic
communications channel. IM64 indicates InterMiCOM64 signals working as a standalone feature.
Configuration Permissive op times (ms) Direct op times (ms)
IM64 at 64 k 13 - 18 17 - 20
IM64 at 56 k 15 - 20 19 - 22
IDiff IM64 at 64 k 22 - 24 23 - 25
IDiff IM64 at 56 k 24 - 26 25 - 27
3.5 AUTORECLOSE AND CHECK SYNYCHRONISM
Accuracy
Timers +/- 20 ms or 2%, whichever is greater
3.6 PHASE OVERCURRENT PROTECTION
Accuracy
IDMT pick-up 1.05 x Setting +/-5%
DT pick-up Setting +/-5%
Drop-off (IDMT and DT) 0.98 x setting +/-5%
IDMT operate +/-5% of expected operating time or 40 ms, whichever is greater*
IEEE reset +/-5% or 40 ms, whichever is greater
DT operate +/-2% of setting or 40 ms, whichever is greater
DT reset Setting +/-5%
Repeatability <5%
Characteristic UK IEC 60255-3 1998
Characteristic US IEEE C37.112 1996
Note:
*Reference conditions: TMS = 1, TD = 7, I> = 1A, operating range = 2-20In
P446SV Chapter 26 - Technical Specifications
P446SV-TM-EN-1 689
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