title: Research on the Error Characteristics of a 110 kV Optical Voltage Transformer under Three Conditions: In the Laboratory, Off-Line in the Field and During On-Line Operation.
abstract: Optical voltage transformers (OVTs) have been applied in power systems. When performing accuracy performance tests of OVTs large differences exist between the electromagnetic environment and the temperature variation in the laboratory and on-site. Therefore, OVTs may display different error characteristics under different conditions. In this paper, OVT prototypes with typical structures were selected to be tested for the error characteristics with the same testing equipment and testing method. The basic accuracy, the additional error caused by temperature and the adjacent phase in the laboratory, the accuracy in the field off-line, and the real-time monitoring error during on-line operation were tested. The error characteristics under the three conditions-laboratory, in the field off-line and during on-site operation-were compared and analyzed. The results showed that the effect of the transportation process, electromagnetic environment and the adjacent phase on the accuracy of OVTs could be ignored for level 0.2, but the error characteristics of OVTs are dependent on the environmental temperature and are sensitive to the temperature gradient. The temperature characteristics during on-line operation were significantly superior to those observed in the laboratory.
authors.affiliation: School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430070, China. xiaoxiahust@163.com.
authors.forename: Xia
authors.initials: X
authors.lastname: Xiao
authors.affiliation: State Grid Electric Power Research Institute, Wuhan 430070, China. huhaoliang@epri.sgcc.com.cn.
authors.forename: Haoliang
authors.initials: H
authors.lastname: Hu
authors.affiliation: School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430070, China. xuyan919@hust.edu.cn.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.affiliation: State Grid Electric Power Research Institute, Wuhan 430070, China. leimin@epri.sgcc.com.cn.
authors.forename: Min
authors.initials: M
authors.lastname: Lei
authors.affiliation: State Grid Electric Power Research Institute, Wuhan 430070, China. xiongqianzhu@epri.sgcc.com.cn.
authors.forename: Qianzhu
authors.initials: Q
authors.lastname: Xiong
keywords: OVT; error characteristics; field off-line; laboratory; on-line operation