Calculation and Analysis of Transformer Transient Over-Voltage in no-Load Switching

DOI

10.2991/icammce-17.2017.1How to use a DOI?

Keywords

transformer,no-load closing,cable sheath,overvoltage,calculation

Abstract

Transformer no-load closing may result in various types of over-voltage, which may affect the stability of power system. To analyze this problem, a 500kV transformer no-load closing model in Bailianhe Pumped Storage Power Station is built by EMTP/ATP, the closing over-voltage on primary equipment is calculated, and the effect of closing angle on over-voltage value is analyzed. Meanwhile, the cable sheath induced voltage in transient process is analyzed. The results show that when three-phase are simultaneously closed and no resonance occurs, no-load closing over-voltage is small, and closing angle has larger impact on the overvoltage, the overvoltage multiple of transformer on low-voltage side is generally greater than that on high-voltage side. In the transformer no-load closing process, transient current of cable core is coupled to the outer sheath by inducing, which results in inducted voltage, and may cause sheath voltage in ungrounded part exceeding the insulation withstand level.

Copyright

© 2017, 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  - Fengyun Quan
AU  - Jia Chen
AU  - Yu Liu
AU  - Yu Wang
AU  - Wangling He
AU  - Xishan Wen
PY  - 2017/04
DA  - 2017/04
TI  - Calculation and Analysis of Transformer Transient Over-Voltage in no-Load Switching
BT  - Proceedings of the 2017 2nd International Conference on Advances in Materials, Mechatronics and Civil Engineering (ICAMMCE 2017)
PB  - Atlantis Press
SP  - 1
EP  - 8
SN  - 2352-5401
UR  - https://doi.org/10.2991/icammce-17.2017.1
DO  - 10.2991/icammce-17.2017.1
ID  - Quan2017/04
ER  -