Relay Protection Tester (also known as Relay Protection Testing Device, Relay Protection) English Name: RXRelay Tester. Microcomputer-based relay protection testing devices are important testing tools for ensuring the safe and reliable operation of power systems. With the rapid development of computer technology, microelectronics technology, and power electronics technology, the continuous introduction of new high-performance relay protection testing devices using the latest technological achievements is an inevitable trend of technological progress.