Distance Section Protection Characteristic Research and Setting Calculation

doi:10.11930/j.issn.10.11930.2015.10.113

Abstract

Abstract: When 110 kV line distance relay serves as remote backup as YND11 type transformer fault on transformer low side backup,setting impedance is not simply the sum of line impedance and transformer impedance. The capability of distance relay on transformer remote backup and load conservation are analyzed in detail for relays of circular, polygon and circular-quadrilateral combined characteristics. The load conservation coefficient calculation method is summarized for different types of distance relays under different load impedance angles. The field test results show the simplicity and validity of proposed calculation method.

Key words: phase distance section, remote backup, avoiding load, setting calculation, reliability coefficient, circular characteristics, polygon characteristics

CLC Number:

TM771

QU Diqing. Distance Section Protection Characteristic Research and Setting Calculation[J]. journal1, 2015, 48(10): 113-117.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.10.11930.2015.10.113

https://www.electricpower.com.cn/EN/Y2015/V48/I10/113

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