Development of High-voltage Standard Current Transformer with Three Phases in One Enclosure Based on Shielding and Balanced Winding

5th Annual International Workshop on Materials Science and Engineering

Liu, Gang^1 ; Ai, Bing^1 ; Zhang, Jiefu^1 ; Liu, Kun^1 ; Xiao, Lingyue^1 ; Zhang, Fuzhou^1

State Grid Sichuan Electric Power Corporation Metering Center, No. 18 Wanjing Road, Wuhou District, Sichuan Province, Chengdu, China^1

关键词: Balancing winding;    Error limits;    High voltage;    Phase currents;    Testing device;    Testing errors;    Testing method;    Three phasis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/585/1/012041/pdf
DOI  :  10.1088/1757-899X/585/1/012041

来源: IOP

【 摘 要 】

When three-phase testing method is applied to test errors of three-phase combined transformers on site, many testing devices are needed while laboratory space is limited. Therefore, narrowing down the space that testing devices occupied appears to be crucial. This article designed and developed the gas-insulated high-voltage standard current transformer with all three phases in one enclosure. Its characteristics is that double shielding and shielding combined with balancing winding are used separately to restrain the influence of leakage current and magnetic field on the error of standard current transformer. Moreover, the article carried out the effect of leakage current and magnetic field on the error of standard current transformer. The results show that the influence of leakage current on the error of standard current transformer is less than 1/10 of the error limit. The influence of adjacent phase current on standard current transformer is less than 1/10 of the error limit. The high voltage standard current transformer with three phases in one enclosure, designed and developed in this article, is capable of testing errors of 10 kV three-phase combined transformers for measurement on the field with three-phase testing method.