Design and Development of Industrial Energy Measurement Error Compensation Unit

Abstract

Abstract—Industrial Energy Measurement System (IEMS) used for measurement of electrical energy consumed by high-tension industrial consumers. It consists of three current transformers (CTs) and three potential transformers (PTs). Cost of IEMS increases with improvement in its accuracy class. The contribution of this article is that, it adduces design and development of high accuracy class and cost-effective IEMS. To accomplish this, a novel Industrial Energy Measurement-Error Compensation Unit (IEM-ECU) is proposed. To realize this, first, the three different accuracy classes, viz. 0.2, 0.5, and 1.0 IEMS are fabricated in the laboratory. Characteristics of every CT and PT are determined. Second, the proposed error correction algorithm is implemented in real time to improve errors of IEMS. Finally, the experimental results are depicted in LabVIEW for mixed class of CTs and PTs. Various experimental tests have been performed and results are validated by comparing the results obtained from digital storage oscilloscope. These results clearly illustrate that the proposed IEM-ECU not only convert lower accuracy class IEMS to higher accuracy class but it also gives flexibility to use available class of CTs and/or PTs, if required under contingency. Thereby, considerable cost savings can be achieved as the performance of lower accuracy class matches with the higher accuracy class.

Keywords:

• Industrial Energy Measurement System (IEMS)
• current transformers (CTs)
• potential transformers (PTs)
• accuracy class
• ratio error
• phase angle error
• correction coefficient
• Industrial Energy Measurement-Error Compensation Unit (IEM-ECU)
• LabVIEW
• digital energy meter (DEM)

Additional information

Notes on contributors

Makarand Sudhakar Ballal

Makarand Sudhakar Ballal received the B.E. degree in electrical engineering from the Government College of Engineering, Aurangabad, India, in 1993, the M.Tech. degree in integrated power system from the Visvesvaraya National Institute of Technology, Nagpur, India, in 1997, and the Ph.D. degree from Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur, in 2007. He is currently as Professor with the Department of Electrical Engineering, Visvesvaraya National Institute of Technology. He has 15 years of experience in the power sector. He was with Maharashtra State Electricity Transmission Company Limited, Mumbai, India, from 1997 to 2012, where he was involved in the commissioning, installation, testing and maintenance of various HV and EHV electrical equipments and accessories. His current research interests include condition monitoring of electrical machines, power quality measurements, and DC/AC microgrids.

Manish Ganesh Wath

Manish Ganesh Wath received the B.E. degree in electrical engineering from the Government College of Engineering, Karad, India, in 1990, and the M.Tech. degree in electrical engineering from the Visvesvaraya National Institute of Technology, Nagpur, India, in 1995. He is currently a Chief Engineer with Maharashtra State Electricity Distribution Company Limited, Mumbai. He has received the Rajiv Gandhi Gold Medal Award in 2016 for his admirable work in the development of energy meter testing laboratory at Nagpur which is accredited by the National Accreditation Board for Testing and Calibration Laboratories. His current research interests include instrument transformer error compensation and measurement techniques.

Hiralal Murlidhar Suryawanshi

Hiralal Murlidhar Suryawanshi received the B.E. degree in Electrical Engineering from Walchand College of Engineering, Sangli, India, in 1988 and M.E. degree in Electrical Engineering from Indian Institute of Science, Bangalore, in 1994. He has been awarded Ph.D. degree by Nagpur University, Nagpur (India) in 1999. He is currently working as Professor in the Department of Electrical Engineering, Visvesvaraya National Institute of Technology, Nagpur, (India). He has received Fellow of INAE in 2012 for his outstanding research. He has received Institution of Electronics and Telecommunication Engineers (IETE)-Bimal Bose Award in 2009, IETE-Biman Behari Sen Memorial Award in 2017 for his leadership in Power Electronics in India. His research interests include the field of power electronics, emphasising developmental of resonant converters, power factor correction, active power filters, FACTs devices, multilevel converters and electric drives.