The station transformer (distribution transformer) protection device is suitable for the comprehensive protection of transformers in non-connected systems, resistance grounding systems or arc suppression coil grounding systems with voltage levels below 35kV. It can be installed in small ring network cabinets such as solid cabinets and inflatable cabinets.

Technical indicators

◆ AC rated current: 5A or 1A (please specify when ordering);

◆ AC rated voltage: 57.7V or 100V (please specify when ordering);

◆ Working frequency: 50HZ;

◆ Working power supply: AC/DC85-265V;

◆ Power supply: internal 24V;

◆ Current measurement accuracy: 0.5 level;

◆ Voltage measurement accuracy: 0.5 level;

◆ Protection action exit time: 1.5 times the fixed value protection action time is not more than 35ms;

◆ Switch-on node: Continuously connect AC/DC220V, 5A current (pure resistive load).

Measurement and control function

◆ Remote measurement: voltage, current, active power, reactive power, power factor, etc., can be set to display primary value or secondary value;

◆ Remote signal quantity: The device has 8 remote signal input quantities;

◆ Event record: The device can record 64 events including input position change, device self-check, protection action, etc., which will not be lost in case of power failure;

◆ Remote control: The device can remotely open and close the switch and remotely call and modify the protection setting through the remote background.

Protection function

◆ Unlimited overcurrent protection

◆ Two-stage time-limited overcurrent protection

◆ Overload protection

◆ Inverse time overload protection

◆ Zero sequence overcurrent protection

◆ Zero sequence overvoltage protection

◆ PT disconnection monitoring

◆ Overvoltage protection

◆ Pressure loss protection

◆ Non-electrical protection (heavy gas trip, light gas alarm, over-temperature trip, high temperature alarm)

Communication Function

◆ You can choose a magnetically isolated high-speed standard RS485 interface or a magnetically isolated high-speed standard CAN2.0B interface (choose one of the two, please specify when ordering);

◆ RS485 interface communication protocol is IEC 60870-103 communication protocol;

◆ The communication protocol of CAN2.0B interface is IEC 60870-104 protocol.