JC-OM202 Transformer DC Bias Online Monitoring System (hereinafter referred to as this system) is a new high-tech product developed by our company for the needs of the power system. The current detection of this system adopts an open-loop current sensor to achieve a fully isolated sampling method, advanced microprocessor technology and unique transient parameter testing technology for linearization and calculation; this system has extremely high reliability and The safety and relatively low price enable this system to be installed on each transformer for real-time detection and centralized monitoring. Achieve accurate and timely grasp of the health status of operating equipment, so that operators can grasp and deal with potential accidents in advance, and ensure the safe power supply of the power grid.