Mal-Operation of Distance Relay in Parallel Cable Lines of Sub-Transmission Network Due to the Effect of Reverse Fault Current in the Direction of Load Flow
Subject Areas : Power EngineeringFarhad Aghajanian Sabagh 1 , Farzad Hajimohammadi 2
1 - Events Studies and Analysis Unit, Technical Office Affairs, Akhtar Bargh Esfahan Company, Isfahan, Iran
2 - Events Studies and Analysis Unit, Technical Office Affairs, Akhtar Bargh Esfahan Company, Isfahan, Iran
Keywords: Mal-operation of distance protection relay, Parallel cable lines, Sub-transmission network, Cable shield grounding,
Abstract :
Mal-operation of distance relays in electric power systems can be caused by a variety of factors, including errors in the relay's hardware or software, incorrect settings, and so on. In this paper, the issue malfunction of distance relay in parallel cable lines of sub-transmission network due to a systemic phenomenon titled "reverse fault current effect in the direction of load flow on the healthy phase" is studied and explored from various aspects. The innovation presented in this article is the detection of described above phenomenon that may cause the distance relay maloperation on a healthy phase of the adjacent line, leading to disconnection of the mentioned line. This is despite the fact that the fault has occurred on only one of the two parallel cable lines, and only that faulted line should be isolated from the network. In this study, we initially provide a comprehensive explanation of this phenomenon and illustrate its impact on the healthy phases of nearby parallel lines. Subsequently, to confirm the occurrence of this phenomenon, a real electrical power network is examined and modeled through DIgSILENT software simulations. Furthermore, we explore and analyze the factors that amplify or mitigate this phenomenon. Concluding the paper, we propose several strategies to mitigate the effects of this phenomenon, thereby preventing the mal-operation of the distance relay.
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