Multifunction digital relay commissioning and maintenance testing

This paper discusses with the protective relay technology over the past 25 years has evolved from single-function electromechanical (EM) relays, to static (electronic) relays, and, finally, to digital multifunction relays. A significant number of these multifunction digital relays are being installed on medium-voltage electric power systems within industrial and commercial facilities. As was required in earlier EM and static relay technologies, digital relays also require commissioning and relay-setting verification. This article discusses the unique challenges the user faces in testing and commissioning digital multifunction relays. It also explores the impact on maintenance testing of self-diagnostics, the digital relay's internal capability to check itself for failures.

[1]  Charles J. Mozina,et al.  Fundamental Reliability Considerations in the Design , Manufacturing and Application of Multifunction Digital Relays for Generator Protection , 2000 .

[2]  F. Nepveux.  Applying the directional neutral, 67N, function in microprocessor multifunction relays , 2002, Conference Record of the 2002 Annual Pulp and Paper Industry Technical Conference (Cat. No.02CH37352).

[3]  J.V.H. Sanderson.  IEEE Recommended Practice for Protection and Co-ordination of Industrial and Commercial Power Systems , 1989 .

[4]  J.R. Closson,et al.  Commissioning numerical relays , 2001, Conference Record of 2001 Annual Pulp and Paper Industry Technical Conference (Cat. No.01CH37209).