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.

Main functions

●Main body heavy gas trip input and output signal contacts

●Main body light gas alarm input and output signal contacts

●High and low voltage side operating circuits compatible with AC/DC operation

●Pressure regulating heavy gas trip input and output signal contacts

●Cold control power loss, high temperature measurement alarm input and output signal contacts

●Pressure regulating light tile report input and output contacts

KR-3440Wiring schematic diagram of non electric quantity protection and measurement device for double coil transformer