Principle and Implementation of Adaptive Neutral Line Breaking Protection

doi:10.11930/j.issn.1004-9649.2017.05.046.06

Abstract

Abstract: Neutral line breaking protection mainly uses load voltage and neutral point displacement voltage. The protection setting value needs to greater then maximum load voltage during normal operation, which leads to low protection sensitivity in long and imbalanced transmission lines. In order to solve this problem, an adaptive neutral line disconnection protection is presented. By introducing adaptive coefficient, the protection setting value is adjusted adaptively according to load imbalance during normal operation. The proposed method has good breaking effect during normal operation, and improve protection sensitivity during neutral line disconnection. The simulation model established by Matlab verifies feasibility of proposed protection.

Key words: power grid, zero line breaking, load unbalance, adaptive, protection

CLC Number:

TM64

CHEN Qianshen, LIU Chunfang, LIAO Weiwen, CHEN Yuan. Principle and Implementation of Adaptive Neutral Line Breaking Protection[J]. Electric Power, 2017, 50(5): 46-51.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2017.05.046.06

https://www.electricpower.com.cn/EN/Y2017/V50/I5/46

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