主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
Fire Science and Technology

Fire Science and Technology ›› 2020, Vol. 39 ›› Issue (1): 67-69.

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Study on electrical insulation performance ofwater mist for electrical transformer

CHEN Bao-hui1, DENG Jie2, SUN Yi-cheng1,LI Bo1, FANG Zhen1, TAO Li3   

  1. 1. State Key Laboratory of Disaster Prevention & Reduction for Power Grid Transmission and Distribution Equipment, Hunan Changsha 410007, China; 2.College of Electrical and Information Engineering, Changsha University of Science & Technology, Hunan Changsha 410114, China; 3.State Grid Hunan Electric Power Company Research Institute,Hunan Changsha 410007, China
  • Received:2019-09-06 Online:2020-01-15 Published:2020-01-15

Abstract: In order to study the electrical insulation performance of water mist for electrical transformers, the breakdown voltages of water mist were tested. The test voltage was nearly 1 000 kV. The breakdown voltage of water mist under different electrode types or
using different water mist nozzles were compared. The results showed that the breakdown voltage of water mist was similar to
that of air, and the insulation ability was good. The electric spray water mist test of 220 kV transformer covered with high voltage
bushing was carried out. By comparison of electric current of transformer before and after spraying, no significant differences were
found, which verifies the electrical insulation ability of water mist.

Key words: water mist, high- voltage, insulation, breakdown voltage, transformer