ISA-367G Line Protection and Control Device

Changyuan Shenru ISA-367G Line Protection and Control Device

The ISA-367G is an integrated device for line protection and control, providing functions such as protection, measurement and control, and operation for transmission lines.

1.1 Basic Configuration

Protection Functions:
• Phase current over-limit recording element with independent threshold
• Three-stage low-voltage blocking directional overcurrent protection (directional element and low-voltage element can be set independently)
• Low-voltage blocking phase current post-acceleration protection
• Three-phase one-shot auto-reclosing (with optional synchronization check, voltage check, and overcurrent blocking reclosing function)
• Under-frequency load shedding with slip frequency blocking
• Under-voltage load shedding with voltage slip blocking
• Zero-sequence directional overcurrent protection for ungrounded systems
• Overload protection
• Control circuit break alarm with optional reclosing blocking function
• Bus PT break alarm with optional blocking of voltage-related protections and line PT break alarm with blocking of auto-reclosing
• Independent operating circuit and fault recording
Measurement and Control Functions: • 3 position remote signals collected via the operating circuit
• 8 remote signal inputs, with options for blocking reclosing, external trip input, external alarm input, external reset, and maintenance input.
• Multiple soft remote signals, including general fault signal, reclosing charging flag, and protection soft switch position
• 19 telemetry measurements including Ia, Ib, Ic, Ua, Ub, Uc, 3I0, Uab, Ubc, Uca, 3U0, Pa, Pb, Q, S, COSφ, and Fr
• Remote control of switches and soft switches, with remote control operation records and statistics
• Large-capacity event records, SOE records, self-test records, and instantaneous protection blocking records
• Harmonic analysis function up to the 11th order
• Remote control function with five-prevention interlocking rules consistent with the five-prevention host
Other Functions:

 • Optional voltage switching module