Modeling and Implementation of Percentage Bias Differential Relay with Dual-Slope Characteristic

2021 IEEE Texas Power and Energy Conference (TPEC) Pub Date : 2021-02-02 DOI:10.1109/TPEC51183.2021.9384987

J. Desai, V. Makwana

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引用次数: 7

Abstract

The transformer's protection against internal faults like phase to phase faults, phase to ground faults, and inter-turn faults are provided using the percentage bias differential protection scheme. The paper introduced dual-slope implementation in percentage bias differential relay by considering mal-operation of the percentage bias differential relay against high external fault current and inrush current harmonics. The paper's beginning shows the modeling and analysis of a percentage bias differential protection scheme to protect the 132KV/33KV primary distribution transformer. The issues of a percentage bias differential protection scheme are explained in the middle of the paper. The dual slop algorithm is designed and implemented on a radial distribution system using MATLAB software environment. The results show that the through fault stability of the transformer is improved due to dual-slope implementation. The risk of maloperation of bias differential scheme due to high external fault current and harmonic inrush current is considerably reduced after implementing dual-slope characteristics. The proposed algorithm is practical for deploying in the digital signal controller (DSC) for protection engineers.

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双斜率特性百分比偏压差动继电器的建模与实现

变压器对内部故障的保护，如相对相故障、相对地故障和匝间故障，采用百分比偏压差动保护方案。考虑到百分比偏压差动继电器对外部高故障电流和涌流谐波的误动，介绍了百分比偏压差动继电器的双斜率实现。本文首先对132KV/33KV一次配电变压器的百分比偏压差动保护方案进行了建模和分析。本文对百分比偏压差动保护方案中存在的问题进行了说明。利用MATLAB软件环境，设计并实现了径向配电系统的双斜率算法。结果表明，双斜率的实现提高了变压器的过故障稳定性。采用双斜率特性后，大大降低了偏置差分方案因外部故障电流和谐波涌流过大而导致的误动风险。该算法适用于保护工程师的数字信号控制器(DSC)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2021 IEEE Texas Power and Energy Conference (TPEC)

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