ISA-351G Feeder Protection and Control Device

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