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

The KR-3000A series main transformer protection and measurement device is a complete set of protection devices suitable for transformers with three or more turns and voltage levels of 110KV and above. The complete set of protection consists of differential protection, backup protection, and non electricity protection. For a 110KV transformer, generally KR-3420A (differential protection)+KR-3410A (high-voltage side backup protection measurement and control)+KR-3430A (low-voltage side backup protection measurement and control)+KR3440A (non electricity protection+operation circuit) can be used to form all the protection and measurement functions of the transformer. Add a set of backup protection and measurement device on the medium voltage side to the main transformer with a medium voltage system, with the same model as KR-3430A.

●Realize the restart of non electric contacts (such as heavy gas, pressure release, etc.) from the transformer body and activate the trip relay of this device to cut off the transformer and send out a central signal and remote control signal; Send to the main protection device CPU as an event record

●Realize the alarm of non electric abnormal signals (light gas, high oil temperature, ventilation obstruction) from the transformer body and send them to the main protection device CPU as event records

KR-3440ATerminal diagram of non electric quantity protection and measurement device for three coil transformer