A novel fast distance relay for series compensated transmission lines |
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| Affiliation: | 1. Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University), and Collaborative Innovation Center for Global Energy Interconnection (Shandong), 250061 Ji’nan, China;2. State Grid Tianjin Electric Power Corporation, China;3. State Grid Hebei Electric Power Corporation, China;1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, PR China;2. Center for Ultra-wide-area Resilient Electric Energy Transmission Networks (CURENT), University of Tennessee, Knoxville 37996, USA;1. School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China;2. School of Engineering, Cardiff University, Cardiff CF24 3AA, UK;1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2. Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA |
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| Abstract: | This paper presents a fast distance relay for series compensated transmission lines based on the R–L differential-equation algorithm using the theory of equal transfer process of transmission lines. The measuring distances based on the proposed algorithm can fast approach the actual value of fault distance when a fault occurs in front of the series capacitor. When a fault occurs behind of the series capacitor, the fault loop, including the series capacitor, does not match the R–L transmission line model, so the measuring distances fluctuate severely. Based on this, the relative position of the fault with respect to the series capacitor can be judged effectively according to the fluctuation range of the measuring distances, and the accurate fault location can be obtained fast. A variety of PSCAD/EMTDC simulation tests show that the new relay has fast operating speed and high accuracy when applied to the long series compensated transmission lines. |
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| Keywords: | Distance relay Equal transfer process of transmission lines Series capacitor Transmission line Differential equation |
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