Setting and Testing of the Out-of-Step Protection at Mongolian Transmission System

Francisco Gonzalez-Longatt, Choidorj Adiyabazar and Ernesto Vazquez Martinez
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Francisco Gonzalez-Longatt: Department of Electrical Engineering, Information Technology and Cybernetics, University of South-Eastern Norway, 3918 Porsgrunn, Norway
Choidorj Adiyabazar: Power System Analysis and Research Department, National Dispatching Centre State-Owned LLC, Ulaanbaatar 14210, Mongolia
Ernesto Vazquez Martinez: Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autonoma de Nuevo Leon, Monterrey, Barragán No. 4904 Norte, Col. Hogares Ferrocarrileros, Monterrey C.P. 64260, Nuevo León, Mexico

Energies, 2021, vol. 14, issue 23, 1-35

Abstract: Modern distance relays have integrated numerous protection functions, including power-swing blocking and out-of-step or pole-slip tripping functions. The main purpose of the power-swing blocking function is to differentiate faults from power swings and block distance or other relay elements from operating during stable or unstable power swings. Most power-swing blocking elements are based on traditional methods that monitor the positive sequence impedance rate. The required settings for the power-swing blocking elements could be difficult to calculate in many applications, particularly those where fast swings can be expected. For these cases, extensive stability studies are necessary to determine the fastest rate of possible power swings. This paper presents a detailed step-by-step method for settings calculation of out-of-step (OOS) protection, both blocking and tripping functions considering a generic two-source system. Then the method is applied to define the protection relay settings installed at the interconnection between the Russian and Mongolian power systems, as it is crucial to feed the demand-rich Mongolian power system. In this paper, a specific impedance method is used for defining the OOS protection settings. This paper innovates by testing the settings using the recordings of the major events of 15 September 2018 in two approaches: hybrid co-simulation and cyber-physical. Both tests have demonstrated the appropriate performance of the proposed settings and proving the proposed methodology works appropriately.

Keywords: power swing detector; out-of-step blocking; out-of-step tripping; blinders (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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