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.

●Time limited overcurrent protection with three-stage composite voltage lockout

●Overload start air cooling; Overload lockout voltage regulation; Overload alarm

●No loss of action records and signal memory in case of power failure

●Equipped with 6 trip outlets for telemetry, remote signaling, and remote control; 6-way remote control exit

●PT disconnection automatic detection

●Two stage zero sequence overcurrent protection

●Matrix tripping method can be used to protect the export

●Remote parameter modification, customized machine backend timing

●Provide three pairs of central signal points

KR-3430Wiring schematic diagram of low backup protection measurement and control device for double coil transformer

Note:

1. The voltage is taken from the PT on this side