NDLI: Considerations and improvements of configuration and protection of a 72 kV mining resistance neutral grounded system

Content Provider	IEEE Xplore Digital Library
Author	Rifaat, R.
Copyright Year	2008
Description	Author affiliation: Jacobs Eng. (Canada), Calgary, AB (Rifaat, R.)
Abstract	This paper provides a discussion on grounding of the neutral of a 72 kV mining system supply with high and low resistance grounding (HRG/LRG), and proposes improvements to the configuration and protection associated with neutral resistance grounded (NRG) systems. For safety reasons, the ground potential rise (GPR) of the switchyards in the mine is limited to 100 Volt. In addition to the reduction of the mine switchyardpsilas ground resistance, the line-to-ground-fault current is reduced by inserting NGR between the ground and the neural of the source transformer. The paper examines the technical viability of extending techniques used for systems of lower voltages such as those used on some generatorpsilas HRG, to a 72 kV mine system. With the advancement of numerical relays and the economical availability of such relays improved protection systems could be adapted for the subject installations.
Starting Page	1
Ending Page	5
File Size	83976
Page Count	5
File Format	PDF
ISBN	9781424420933
DOI	10.1109/ICPS.2008.4606279
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resistance Circuit faults Grounding Resistors Fault currents Relays Power transformer insulation Industrial power system protection Neutral Resistance Grounding Ground Fault Protection 72 KV Mining System Protection
Content Type	Text
Resource Type	Article

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