Abstract：The micro-water content of transformer insulation is one of the important factors affecting its life. Based on the theory of depolarized charge and dielectric response, this paper extracts the starting depolarization power Soil and the terminal depolarization power Spaper of the depolarization current to evaluate the micro-water content of transformer oil paper insulation. Firstly, the paper compares the depolarization current curve of insulating oil and insulating paper under different moisture contents. Then, the characteristic quantities Soil and Spaper are extracted according to the dielectric response parameter identification results of the depolarization current curve. The analysis results suggest that both Soil and Spaper show an exponential increase with the increase of the micro-water content in the insulating oil or paper. Finally, the paper gives an example to verify that the characteristic quantity can well evaluate the micro water content of transformer oil-paper insulation.
陈群静, 蔡金锭, 叶荣. 基于去极化电量的油纸绝缘变压器微水含量评估[J]. 电气技术, 2019, 20(3): 62-66.
Chen Qunjing, Cai Jinding, Ye Rong. Evaluation of water content of oil-paper insulation transformer based on depolarization electric quantity. Electrical Engineering, 2019, 20(3): 62-66.
2019, Vol. 20 
