Protective Relay Settings: ct_saturation
Protective relay settings and coordination parameters per IEEE C37 and IEEE 242. Covers IEEE C37.112-2018 inverse time-overcurrent curve constants (A, B, p, tr) for moderately/very/extremely inverse curves and SEL vendor extensions; IEC 60255-151 curve constants (k, alpha); CT accuracy classes C100/C200/C400/C800 per IEEE C57.13-2016 with burden limits; relay pickup guidance by ANSI device number (50, 51, 50N, 51N, 27, 59, 81U, 81O); coordination time intervals (CTI) per IEEE 242-2001; and CT saturation voltage thresholds.
| parameter type | record id | curve designation | curve name | curve standard | notes |
|---|---|---|---|---|---|
| ct_saturation | sat_voltage_C100 | C100_sat | Saturation Knee Voltage C100 | IEEE C57.13 | Saturation knee-point voltage >= 100V; CT must withstand 20x rated secondary current without >10% error at rated burden |
| ct_saturation | sat_voltage_C200 | C200_sat | Saturation Knee Voltage C200 | IEEE C57.13 | Saturation knee-point voltage >= 200V; typical for 15kV class distribution feeders; use ANSI or 90-degree method |
| ct_saturation | sat_voltage_C400 | C400_sat | Saturation Knee Voltage C400 | IEEE C57.13 | Saturation knee-point voltage >= 400V; required for high-impedance bus differential protection; check CT excitation curve |
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