Protective Relay Settings: ct_burden
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_burden | burden_1p0 | B-1.0 | Burden B-1 Standard | IEEE C57.13 | Impedance: 1.0 ohm at 60 Hz; PF=0.5; VA=500 at 5A secondary; standard metering burden |
| ct_burden | burden_2p0 | B-2.0 | Burden B-2 Standard | IEEE C57.13 | Impedance: 2.0 ohm at 60 Hz; PF=0.5; VA=1000 at 5A secondary; used for moderate relay burden |
| ct_burden | burden_4p0 | B-4.0 | Burden B-4 Standard | IEEE C57.13 | Impedance: 4.0 ohm at 60 Hz; PF=0.5; VA=2000 at 5A secondary; heavy relay burden |
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