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Wide-Area Backup Protection Algorithm Based on Earth Impedance Comparison Principle

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Abstract:

A novel algorithm is proposed for the purpose of improving the reliability and sensibility of fault component identification of wide area backup protection. The algorithm, called earth impedance comparison protection (EICP), is realized by comparing the ratios of different nodes, and the ratio is obtained by the bus voltage to the differential current. The advantages of EICP are verified in this paper using the measurement function of wide-area measurement system. The results of case studies show that EICP is superior to the current differential protection in terms of the sensitivity and to the directional pilot protection in terms of the dependability. The satisfactory results can be obtained when the EICP method is applied in the event of abnormal operations of protective relays and circuit breakers, measurement error scenarios or substation DC failure.

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Info:

Periodical:

Applied Mechanics and Materials (Volumes 513-517)

Pages:

858-862

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.513-517.858

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Online since:

February 2014

Authors:

Zhen Xing Li*, Qiu Li, Tao Zhang

Keywords:

Earth Impedance, Fault Component Identification, Wide-Area Backup Protection, Wide-Area Measurement System (WAMS)

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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