Development of an Algorithm for Improving the Reliability of Digital Differential Protection in Transient Modes

2020 International Ural Conference on Electrical Power Engineering (UralCon) Pub Date : 2020-09-01 DOI:10.1109/UralCon49858.2020.9216232

N. Zaytseva, D. Fedosov

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引用次数: 1

Abstract

The article considers the problem of improving the differential protection reliability in transient modes with current transformers' saturation. It is noted that in recent years in the power systems there have been repeated some incorrect trips of these protections in transient conditions. Tripping was observed not only during external short circuits, but also during motor starts and external load switching. The digital differential protection models for generator and transformer are developed using MATLAB Simulink. Transient modes are simulated, which confirmed the possibility of incorrect protection tripping during external short circuits and during motor starts and generator switching. To increase the protection reliability, it is proposed to apply blocking principle by the aperiodic (DC) component in the differential current in addition to digital restraining. Modeling the advanced protection operation confirmed the complete exclusion of incorrect trips during external short circuits and maintaining sensitivity to internal damage. The problem of measuring the aperiodic (DC) current component in the current transformer secondary circuits is noted. It can be solved by the use of current converters based on Hall sensors.

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一种提高瞬态模式数字差动保护可靠性的算法研究

本文研究了在电流互感器饱和情况下，提高暂态差动保护可靠性的问题。值得注意的是，近年来在电力系统中，这些保护在暂态状态下一再出现错误跳闸的情况。跳闸不仅在外部短路时被观察到，而且在电动机启动和外部负载切换时也被观察到。利用MATLAB Simulink开发了发电机和变压器的数字差动保护模型。对暂态模式进行了仿真，证实了在外部短路、电动机启动和发电机切换过程中保护误跳闸的可能性。为了提高保护的可靠性，在数字抑制的基础上，提出了利用差动电流中的非周期(DC)分量进行阻塞的原理。模拟先进的保护操作确认了在外部短路期间完全排除不正确的跳闸，并保持对内部损坏的敏感性。指出了电流互感器二次回路中非周期电流分量的测量问题。采用基于霍尔传感器的电流变换器可以解决这一问题。

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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2020 International Ural Conference on Electrical Power Engineering (UralCon)

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