Insulation Monitoring Sensor

The active zero-flux leakage current sensor is a micro current sensor specifically developed for online monitoring of insulation in high-voltage electrical equipment. It uses materials with high initial magnetic permeability for the iron core, and employs unique deep negative feedback technology and multi-layer metal shielding measures, enabling automatic compensation of the iron core to maintain it in an ideal zero magnetic flux state. This sensor can accurately detect power frequency currents ranging from 100 μA to 700 mA. The phase transformation error is not more than 0.01°, and it exhibits good temperature characteristics and electromagnetic field interference resistance, fully meeting the accuracy requirements for equipment sampling under complex power plant site disturbances. It is applied in online monitoring of substation equipment, including: online monitoring of transformer core grounding; online monitoring of high-voltage bushing insulation; online monitoring of metal zinc oxide lightning arresters; online monitoring of current and voltage transformers and capacitors; high voltage live display.