Power System Protection With Relay Co-Ordination

  Mehulkumar D. Devdhariya,  Vibhuti R. Adroja,  Kajal M. Rafaliya

Relayco-ordinationplaysanimportantroleintheprotectionofpower system.Forproperprotection,properco-ordinationofrelays with appropriate relay settings is to be done. Relay settings are done in such a way that proper co-ordination is achieved along various series network. Relay co-ordination can be done by selecting proper plug setting and time multiplication setting of the relay, considering maximum fault current at the relay location. After selecting the plug setting and time multiplier setting, the co-ordination can be checked graphically.When plotting co-ordination curves, certain time intervals must be maintained between the curves of various protective devices in order to ensure the correct sequential operation of the devices when co-coordinating inverse time over current relays.For a given fault current, the operating time of IDMT relay is jointly determined by its plug and time multiplier settings. Thus this type of relay is most suitable for proper co¬ordination. Operating characteristics of this relay are usually given in the form of a curve with operating current of plug setting multiplier along the X axis and operating time along Y axis.

Keywords- Optimal coordination of relay, Primary and Back-up relay, Time setting multiplier, Plug setting multiplier, Relay setting, Over current relay, IDMT relay.

Unique Identification Number - IJEDR1702017
Page Number(s) - 101-106
Pubished in - Volume 5 | Issue 2 | April 2017
DOI (Digital Object Identifier) -   
Publisher - IJEDR (ISSN - 2321-9939)

  Mehulkumar D. Devdhariya,  Vibhuti R. Adroja,  Kajal M. Rafaliya,   "Power System Protection With Relay Co-Ordination", International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.5, Issue 2, pp.101-106, April 2017, Available at :http://www.ijedr.org/papers/IJEDR1702017.pdf