Preventing Maloperation of Mho Distance Relays During Load Encroachment Conditions Through a Pilot Scheme

IF 1.6 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Journal of Electrical Engineering & Technology Pub Date : 2024-09-04 DOI:10.1007/s42835-024-02019-y

Sujitha Arasu, Rathinam Ananthanarayanan

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Abstract

Distance relays are crucial components of power transmission systems, providing protection against faults and ensuring the stability and reliability of the electrical grid. However, under certain conditions, they may experience maloperations, leading to erroneous tripping or failure to trip during fault events. The proposed scheme incorporates a modified Mho characteristics for monitoring load impedance to improve loadability during load encroachment conditions and prevent false tripping. In addition, the pilot scheme Permissive Under reach Transfer Trip (PUTT) provides communication capabilities enhancing the relay’s accuracy in fault detection. Extensive simulations and tests are conducted using MATLAB/Simulink to validate the effectiveness of the pilot scheme in EMTP (Electro Magnetic Transient Program) environment. The results indicate that the proposed scheme achieves faster detection of remote circuit breaker operations by 520ms bypassing the Zone 2 set delay of 500ms also. The scheme offers a practical and cost-effective solution to mitigate the challenges associated with load encroachment and enhance the overall stability and reliability of power systems.

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通过试点计划防止 Mho 距离继电器在负载侵占情况下误动作

距离继电器是输电系统的重要组成部分，可提供故障保护并确保电网的稳定性和可靠性。然而，在某些条件下，它们可能会出现误动作，导致在故障事件中错误跳闸或无法跳闸。拟议方案采用改进的 Mho 特性来监测负载阻抗，以提高负载侵蚀条件下的可负载性，防止误跳闸。此外，试验方案允许欠压转移跳闸（PUTT）提供了通信功能，提高了继电器故障检测的准确性。我们使用 MATLAB/Simulink 进行了大量模拟和测试，以验证试点方案在 EMTP（电磁暂态程序）环境中的有效性。结果表明，拟议方案绕过了 2 区 500ms 的设定延迟，以 520ms 的速度实现了对远程断路器操作的快速检测。该方案提供了一个实用且经济高效的解决方案，可减轻与负载侵蚀相关的挑战，提高电力系统的整体稳定性和可靠性。

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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来源期刊

Journal of Electrical Engineering & Technology ENGINEERING, ELECTRICAL & ELECTRONIC-

CiteScore

4.00

自引率

15.80%

发文量

321

审稿时长

3.8 months

期刊介绍： ournal of Electrical Engineering and Technology (JEET), which is the official publication of the Korean Institute of Electrical Engineers (KIEE) being published bimonthly, released the first issue in March 2006.The journal is open to submission from scholars and experts in the wide areas of electrical engineering technologies. The scope of the journal includes all issues in the field of Electrical Engineering and Technology. Included are techniques for electrical power engineering, electrical machinery and energy conversion systems, electrophysics and applications, information and controls.