The characteristics of switching impulses in cable OHL mixed network

In recent years, in order to improve the efficiency of urban power supply, automatic reclosing operation is gradually applied in the XLPE cable-OHL mixed line. Operation experience shows that the grounding fault occurred in the overhead line, in most cases, is instantaneous and the success rate of r...

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Bibliographic Details
Published in2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP) pp. 233 - 236
Main Authors Jiankang Zheng, Xiaoyu Yang, Long Xu, Aixuan Zhao, Xing Zhang, Junbo Deng, Guanjun Zhang
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2017
Subjects
Amplitude-frequency characteristics
Cable insulation
Fault location
Grounding
Grounding fault
Mixed line
Power supplies
PSCAD
Reclosing
Voltage control
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Summary:In recent years, in order to improve the efficiency of urban power supply, automatic reclosing operation is gradually applied in the XLPE cable-OHL mixed line. Operation experience shows that the grounding fault occurred in the overhead line, in most cases, is instantaneous and the success rate of reclosing is high. The grounding fault occurred in the cable line is almost permanent and the success of reclosing is quite low. In this paper, a typical mixed line of urban power network was built in PSCAD software. The amplitude-frequency characteristics of overvoltage, caused by single-phase grounding fault of cable segment and overhead line segment, were studied. And the characteristic parameters of two kinds of overvoltage were extracted. According to these parameters, the fault location could be determined and the basis of reclosing strategy was provided.
DOI:10.1109/CEIDP.2017.8257632