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ABSTRACT
Protection engineers and academicians are continuously working towards better relaying for modern transmission structures. This has become a requirement because transmission structure, nowadays, is being updated with new technologies, e.g. flexible AC transmission system devices. In this paper, it has been observed that the differential DC plays an important role in distinguishing the internal and external faults. A criterion is then developed based on this unique feature of the differential DC for the identification of faults in modern transmission lines. The performance of the proposed criterion has been tested with the help of simulation study carried out using EMTDC/PSCAD software for a variety of fault types with variations in fault location, fault resistance, fault inception angle, and compensation level. Furthermore, the performance of the proposed algorithm is also investigated for several rare conditions such as evolving faults, cross-country faults, noise in measurement, and measurement error. The results prove that the scheme is selective, accurate, and robust for uncompensated and series-compensated lines while it is accurate for low resistance faults in the case of a shunt-compensated line.
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Notes on contributors
Jai Prakash Sharma
Jai Prakash Sharma is pursuing PhD degree in the Department of Electrical Engineering, National Institute of Technology Jamshedpur, India. His research interests include transmission line compensation and protection.
Kasala Vijetha
Kasala Vijetha received her BTech degree from the Department of Electrical and Electronics Engineering, National Institute of Technology, Jamshedpur, India in 2020. Currently, she is working with ALSTOM Transport India Limited, Bengaluru, India. Her research interests include FACTS and power system protection. Email: [email protected]
Priya Bharti
Priya Bharti received her BTech degree from the Department of Electrical and Electronics Engineering, National Institute of Technology, Jamshedpur, India in 2020. Currently, she is working with Analytics Quotient Services India Private Limited, Bengaluru, India. Her research interests include FACTS and power system protection. Email: [email protected]
Balla Satya Sravani
Balla Satya Sravani received her BTech degree from the Department of Electrical and Electronics Engineering, National Institute of Technology, Jamshedpur, India in 2020. Currently, she is working with Oracle Financial Services Software Limited, Bengaluru, India. Her research interests include FACTS and power system protection. Email: [email protected]
Om Hari Gupta
Om Hari Gupta received the PhD degree in electrical engineering from the Indian Institute of Technology Roorkee, Uttarakhand, India. He visited the University of Ontario Institute of Technology (UOIT), Oshawa, Canada, for research on microgrid operation. Currently, he is an assistant professor in the Department of Electrical Engineering, National Institute of Technology Jamshedpur, India. Dr Gupta is a recipient of the Queen Elizabeth-II scholarship for pursuing research on microgrid operation at UOIT, Canada. His research interests include power system compensation and protection, microgrid control and protection, and control of drives. Email: [email protected]
Piyush Khadke
Piyush Khadke is currently working as an assistant professor in the Electrical Engineering Department, Shri Ramdeobaba College of Engineering and Management, Nagpur. He has been awarded a PhD degree from VNIT, Nagpur in 2017 in the area of the transmission line protection field. He has also worked in Power Grid Corporation of India Ltd for 2 years. He has completed BTech (2010) in electrical & electronics and MTech (2014) in integrated power systems from VNIT, Nagpur. His area of research work is the EHV transmission protection system, digital relaying, EHV substation equipments, and power system. Email: [email protected]