HF Series High Frequency Partial Discharge Monitoring Sensor

Partial discharge monitoring is now a technical means of diagnosing the insulation condition of equipment that has been widely recognized and adopted internationally. Mainly used for routine inspection or on-site inspection of high-voltage equipment in substations. It is used to monitor and analyze the internal partial discharge signal of gas-insulated combined electrical equipment (GIS) equipment. It can be analyzed centrally by the data analysis system, display and output alarms, and then monitor and evaluate the operation status of GIS equipment, so as to effectively avoid sudden accidents of GIS high-voltage equipment. . The large amount of data on partial discharge and the complex situation on site make real-time monitoring of partial discharge a challenging task. When partial discharge occurs inside the cable, the high-frequency current will propagate to the ground along the ground wire. The partial discharge detection is realized by installing a high-frequency partial discharge sensor on the ground wire to detect the high-frequency current signal. The high-frequency partial discharge sensor uses the Rogowski coil method, which surrounds multiple turns of conductive coils on the annular magnetic core material. The high-frequency alternating electromagnetic field caused by the high-frequency current passing through the center of the magnetic core will generate an induced voltage on the coil. . There is no electrical connection between the measurement loop of the sensor and the measured current, which is a non-invasive detection method, and the equipment under test does not need to be shut down. By monitoring monitoring and PD trending activity using a PD on-line monitoring system, its development over time can be continuously observed so that high-voltage cables or cable accessories can be replaced in time before failure occurs.

BNWHF series high-frequency partial discharge sensor is a sensor that can be widely used in partial discharge detection of cables, switch cabinets, GIS, generators, PT cabinets, circuit breakers and other high-voltage electrical equipment of various power levels. It can be installed on the ground wire of the cable input bushing/surge capacitor, on the ground wire of the cable body or shield, on the secondary winding of the current transformer in the switchgear, on the neutral wire of the generator and transformer. Real-time online monitoring and diagnosis of the reliability of the discharge that occurs on high-voltage equipment, and realize digitalization of substation maintenance. Provide a strong foundation for end users to ensure the safe and reliable operation of the equipment during the expected life cycle of the equipment.