Online measurement of distributed capacitance in distribution network

Abstract

The distributed capacitance current of distribution network is the main factor of single-phase grounding current. In the current engineering, the distributed capacitance current is mostly measured by testing the distributed capacitance. Using the volt and ampere relationship of capacitor element can be indirectly realizing the test of distributed capacitance current. Most of the existing distributed capacitance measurement methods use the total impedance of the system to replace the distributed capacitance, which is easily to cause measurement error. Based on the analysis of the distribution network operation, this paper proposes an online measurement technology of distribution network which can precisely test the distributed capacitance. The physical engineering model is established, and the simulation research and design is carried out. The research shows that the online test technology of distributed capacitance can control the test accuracy below 1%, which can effectively make up for the deficiency of the existing distributed capacitance testing technology. It can realize the online detection of the distributed capacitance current of the distribution network, and ensure the operation safety.