KR-3400Introduction to Series Main Transformer Protection and Measurement Devices

The KR-3400 series main transformer protection and measurement device is a complete set of protection devices suitable for double coil transformers with voltage levels of 35KV and below. The complete set of protection consists of differential protection, high and low backup protection, and non electricity protection. For 35KV transformers, KR-3420 (differential protection)+KR-3410 (high-voltage side backup protection measurement and control)+KR-3430 (low-voltage side backup protection measurement and control)+KR3440 (non electric quantity protection+operation circuit) can generally be used to form all the protection and measurement functions of the transformer.

●Differential quick break protection

●Ratio differential protection for second harmonic braking

●Action records and signal memory that are not lost in case of power failure

●Remote parameter modification, customized machine backend timing

●4-way trip exit

●6-way remote control exit

●Remote control, telemetry, and remote signaling

KR-3420Wiring schematic diagram of differential protection measurement and control device for double coil transformer