Changyuan Shenru ISA-351G Feeder Protection and Control Device

Protection Functions:
? Phase current over-limit recording element with independent threshold
? Three-stage current protection with independent enable/disable function
? Inverse-time overcurrent protection with selectable extreme, very, or general operating characteristics
? Phase current acceleration protection with selectable front acceleration or rear acceleration
? Selectable three-phase single/double auto-reclosing (with enable/disable synchronous check and dead voltage check)
? Under-frequency load shedding with slip/no-slip blocking
? Under-voltage load shedding with voltage slip blocking
? Zero-sequence overcurrent protection with zero-sequence direction, compatible with different grounding methods
? Overload protection
? Control circuit break alarm with selectable reclosing blocking function
? Bus PT break alarm with selectable blocking of voltage-related protections
? External input protection with enable/disable and settable delay
? Independent operating circuit and fault recording
? Remote ground fault line selection test trip function for ungrounded systems (automatic identification of line grounding)
? Blocking of simplified bus protection
Control and Monitoring Functions:
? 3 position teleindication signals collected via operating circuit; 8 (expandable to 20) teleindication input collections, with options to block reclosing, external trip input, external alarm input, external reset, device maintenance; multiple soft teleindication signals, including general fault signal, reclosing charging flag, protection soft plate
? 21 telemetry quantities: Ia, Ib, Ic, Ua, Ub, Uc, 3I0, Uab, Ubc, Uca, 3U0, Pa, Pb, P, Q, S, COSφ, Fr, 3I01, 3I05
? Remote control of switches and soft plates, with remote control operation records and statistics
? Large-capacity event recording, SOE recording, self-check recording, instantaneous protection blocking recording
? Up to 11th harmonic analysis function
? Bay-specific interlocking remote control function with rules consistent with five-prevention host