Analysis of Two Points Grounding Accident in CT Secondary Circuit

DOI

10.2991/icmmct-18.2018.39How to use a DOI?

Keywords

Current transformer, Relay protection, Impedance

Abstract

The current transformer (CT) is a kind of transformer. The working principle of CT is briefly introduced.Combined with the actual case of relay error trip accident, the specific cause of the accident caused by two point grounding of the secondary circuit loop of the current transformer is further analyzed. There are two points grounding in the B phase circuit in the current transformer. The disturbance of instantaneous potential difference between two points of the ground network causes the protection device to flow into the larger current, thus causing the differential protection device to act. At the same time, the standard requirements for the secondary circuit grounding of the current transformer are put forward. The preventive measures that can be taken in every link of substation operation and maintenance are given.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Yuanyi Li
AU  - Yueyue Li
AU  - Qixin Nie
AU  - Qian Cheng
AU  - Hui Tang
AU  - Yuan Lin
AU  - Fusheng Zhang
AU  - Diancai Shi
AU  - Ren Liu
AU  - Chuanzong Zhao
PY  - 2018/06
DA  - 2018/06
TI  - Analysis of Two Points Grounding Accident in CT Secondary Circuit
BT  - Proceedings of the 2018 6th International Conference on Machinery, Materials and Computing Technology (ICMMCT 2018)
PB  - Atlantis Press
SP  - 198
EP  - 201
SN  - 2352-5401
UR  - https://doi.org/10.2991/icmmct-18.2018.39
DO  - 10.2991/icmmct-18.2018.39
ID  - Li2018/06
ER  -