A Novel On-line Monitoring System for High Voltage Cable Dielectric Loss Detection

Due to the difficulty of leakage current separation and cable core voltage acquisition, the traditional high voltage cable online monitoring system of dielectric loss have low precision and data instability. Therefore, a new online monitoring system for high voltage cable dielectric loss has been proposed, the accuracy of dielectric loss detection is improved, and the safe and stable operation of the cable is guaranteed. First, the principle of the high voltage cable dielectric loss detection system is introduced. Then, the influence of the distance between the cabinet and the cable on the accuracy of the dielectric loss is analyzed, and the method of correcting the distance error by the ranging method is proposed. Different cable transmission modes were analyzed for the effect of the sensor for leakage current separation, and a method of installing simultaneous sampling current monitoring units was proposed. Finally, the influence of different sampling errors on the dielectric loss detection results is analyzed, and a method of ensuring sampling synchronization using a satellite synchronization system is proposed. The high-voltage cable dielectric loss online monitoring system proposed in the paper is also applicable to live detection.