{"title":"Preventing Maloperation of Mho Distance Relays During Load Encroachment Conditions Through a Pilot Scheme","authors":"Sujitha Arasu, Rathinam Ananthanarayanan","doi":"10.1007/s42835-024-02019-y","DOIUrl":null,"url":null,"abstract":"<p>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.</p>","PeriodicalId":15577,"journal":{"name":"Journal of Electrical Engineering & Technology","volume":null,"pages":null},"PeriodicalIF":1.6000,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Electrical Engineering & Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s42835-024-02019-y","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
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.
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.