ISA-392GA-MP Line Protection and Control Device

Changyuan Shenru ISA-392GA-MP Line Protection and Control Device

1. Overview
The ISA-392GA-MP is an integrated protection and control device for 35kV and below transmission lines, capable of performing line protection, monitoring, control, and other functions. It is suitable for various substations, power plant auxiliary systems, and large industrial and enterprise power systems.

1.1 Basic Configuration

Protection Functions:
1. Three-stage composite voltage blocking overcurrent protection
2. Three-stage zero-sequence overcurrent protection
3. Inverse-time overcurrent protection (both overcurrent stage III and zero-sequence stage III can be set as inverse-time segments)
4. Overcurrent acceleration protection
5. Zero-sequence overcurrent acceleration protection
6. PT broken-phase overcurrent protection
7. Three-phase one-shot auto-reclosing
8. Under-frequency load shedding
9. Under-voltage load shedding
10. Overload protection (trip/alarm)
11. FC overcurrent blocking protection
12. Overvoltage protection (trip/alarm)
13. Undervoltage protection (trip/alarm)
14. Zero-sequence overvoltage alarm (grounding alarm)
15. Small current grounding line selection
16. Auxiliary alarm logic including PT broken wire alarm, line PT broken wire alarm, control circuit broken wire alarm, spring not charged alarm, CT broken wire alarm, TWJ abnormal alarm, etc.
Monitoring and Control Functions:
1. Complete control circuit and switch position acquisition; control circuit without pressure blocking
2. Remote operation, maintenance status, and signal reset function inputs
3. Hardwired inputs for disabling auto-reclosing, spring not charged, overcurrent acceleration after fault, and manual closing synchronization
4. Supports up to 24 general remote signaling inputs
5. Multiple soft remote signals, including general fault signal, auto-reclosing charging completion, etc.
6. Four dual-point remote signals for positions 1~4
7. 22 self-acquired telemetry measurements: Ua, Ub, Uc, Ux, Ima, Imb, Imc, I0wj, Uab, Ubc, Uca, Pa, Pb, Pc, Qa, Qb, Qc, P, Q, S, COSφ, Fr
8. One remote control output function; protection soft压板 supports remote control. Includes remote control operation records and statistics
9. Large capacity event records, SOE records, self-check records, and instantaneous blocking protection records

10. Telemetry harmonic analysis function
11. Manual/remote closing synchronization function
12. Metering function (forward active/reactive energy)
13. Two channels of DC 4~20mA output (optional)