Research on the Design of Enclosed Protective Discharge Gap for Transformer Neutral Point Based on Energy Aggregation Characteristics
Xiaohui Li, Jun Kang, Jianwu Li, Shanghu Zhou, Fujie Wang, Guoxiang Ma, Zhiwu Qin, Huifang Dong, Yuanyue Zhang, Junjun Yang, Chengxiao Tong, Shifeng Liu · Journal of Physics Conference Series · 2025
Abstract Power transformers are very important components of the power system, playing a crucial role in controlling the voltage of electrical energy and driving the transmission of electrical energy. However, in transformers above 110kV, the breakdown voltage of the protection gap is highly dispersed. Due to the influence of altitude and other factors, the protection effect of the neutral point, especially in Northwest China, is poor, prone to protection mal-operation, which seriously affects the lives of residents and social production. Based on this the development of neutral point protection equipment is of great significance. This article focuses on the energy concentration characteristics of discharge gaps in enclosed spaces. By calculating the arc energy value and the number and duration of energy super-positions within the protective equipment’s enclosed casing, the enclosed shell structure and design pressure boundary are determined. An enclosed shell that meets the usage requirements is designed, and the accuracy and rationality of the design are verified through various performance tests.