ABB has introduced a new feeder and motor protection relay, the REX521GHHPSH07G. With its superior performance and comprehensive protection features, this product meets a wide range of needs for power system protection, measurement, monitoring and control.

REX521GHHPSH07G features include:

Provides comprehensive protection for a wide range of grounding systems, including neutral ungrounded systems, resonant grounding systems, neutral direct grounding systems and resistance grounding systems.

A variety of new advanced features, such as power quality monitoring and protection features such as acceleration before and after reclosing, are added especially for the Chinese market.

Supports advanced data acquisition and analysis to help improve user network control efficiency and operation and maintenance.

Full Chinese man-machine interface display, making debugging and operation more convenient.

In terms of technical parameters, the REX521GHHPSH07G offers a range of protection features, including but not limited to:

Three stage overcurrent protection

Two zero sequence current (ground) protection

Zero sequence current (ground) protection in two directions

A section of overvoltage protection

A low voltage protection

Two-stage frequency protection

A negative sequence protection

Three-phase motor start-up monitoring

Thermal overload protection for three-phase equipment

In addition, the REX521GHHPSH07G also has a variety of measurement and monitoring functions, such as three-phase current measurement, zero-sequence current measurement, zero-sequence voltage measurement, three-phase voltage measurement, system frequency measurement, three-phase power and electrical energy measurement.