EPE-Based Pilot Relaying Scheme Immune to SIR Variations

Abstract

To avoid the under/over-reaching problems of distance protection of extra high voltage/ultra high voltage transmission lines (TLs) in the presence of series compensation, pilot relaying scheme can be preferred. In this article, a pilot relaying scheme is proposed which is unaffected by source-to-line impedance ratio variations and is based on the estimated phase error (EPE) of shunt charging component of the TL. For external fault, EPE is very small or close to pre-fault EPE while for internal fault, EPE is more than 10 times of pre-fault EPE. This scheme can be used to protect the series-compensated line as well as an uncompensated line with the same threshold value. The prerequisites for this scheme are the parameters of the TL which is to be protected. The scheme has been tested using power system computer aided design/electromagnetic transient and DC simulations for three different types of test power systems. The proposal is found to be accurate for different test systems, fault types, variations in compensation level, source impedance, fault location and fault resistance.

KEYWORDS:

• Estimated phase error
• Pilot relaying
• Series compensation
• Transmission line

ORCID

Om Hari Gupta http://orcid.org/0000-0001-6171-809X

Additional information

Notes on contributors

Om Hari Gupta

Om Hari Gupta received the PhD degree in electrical engineering from the Indian Institute of Technology Roorkee, Uttarakhand, India. He has visited University of Ontario Institute of Technology (UOIT), Oshawa, Canada, for the research on microgrid operation. Currently, he is an Assistant Professor in the Department of Electrical and Electronics Engineering, National Institute of Technology, Jamshedpur, India. His research interests include power system compensation and protection, microgrid control and protection, and control of drives. Dr Gupta is a recipient of Queen Elizabeth-II scholarship for pursuing research on microgrid operation at UOIT, Canada. Corresponding author. Email: [email protected]

Manoj Tripathy

Manoj Tripathy received his BE degree in electrical engineering from Nagpur University, Nagpur, India, in 1999, the MTech degree in instrumentation and control from Aligarh Muslim University, Aligarh, India, in 2002, and the PhD degree from the Indian Institute of Technology Roorkee, Roorkee, India, in 2008.He is currently working as Associate Professor in the Department of Electrical Engineering, Indian Institute of Technology Roorkee, Uttarakhand, India. His fields of interest are wavelets, neural network, optimization techniques, content-based image retrieval, digital instrumentation, digital protective relays and digital speech processing.Dr Tripathy is a reviewer for various international journals in the area of power systems and speech. Email: [email protected]