ISA-378G Transformer Integrated Protection and Control Device

The ISA-378G adopts an independent dual-CPU system technology, primarily designed for small-capacity terminal substations to implement differential protection, main protection, backup protection, measurement and control, and operation functions for two-winding transformers.

1 Basic Configuration

Protection Functions:
1. Differential Instantaneous Protection
2. Composite Ratio Differential Protection
3. CT Open-Circuit Alarm
4. Differential Current Over-Limit Alarm
5. Three-Stage Composite Voltage Blocked Overcurrent Protection on High-Voltage Side/Low-Voltage Side
6. Three-Stage Overload Protection
7. Busbar PT Open-Circuit Alarm and Busbar Grounding Alarm on Both Sides
8. Breaker Control Circuit Open-Circuit Alarm on Both Sides
9. Main Protection
Measurement and Control Functions:
1. 6 Position Remote Signals Collected via Operation Circuit
2. 8 Main Trip Inputs
3. 35 Dry Contact Remote Signal Inputs, including External Reset, Differential Instantaneous Protection Plate, Ratio Differential Protection Plate, Main Light Gas, On-Load Tap Changer Light Gas, Non-Electrical Quantity 1, Non-Electrical Quantity 2, Maintenance Input.
4. Multiple Soft Remote Signals, including General Fault Signal, Protection Soft Plate Position
5. 36 Telemetry Measurements: IaH, IbH, IcH, UaH, UbH, UcH, IaL, IbL, IcL, UaL, UbL, UcL, UabH, UbcH, UcaH, UabL, UbcL, UcaL, PaH, PbH, PcH, PaL, PbL, PcL, PH, QH, SH, COSφH, PL, QL, SL, COSφL, Fr, ZL1, ZL2, DW
6. 9 Operation Switch Remote Controls and Soft Plate Remote Controls, with Remote Control Operation Records and Statistics
7. Large-Capacity Event Records, SOE Records, Self-Check Records, Instantaneous Block Protection Records
8. Harmonic Analysis Function up to 11th Order
9. Bay-Specific Five-Protection Lockout Remote Control Function with Rules Compatible with Five-Protection Host