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System Grounding and Ground-Fault Protection Methods for UPS-Supplied Power Systems

Cover

The use of solid grounding for UPS-supplied power systems is currently a common practice in data centers. The use of conventional ground fault protection systems in this application often leads to circulating currents and nuisance tripping, resulting in the desire to defeat or exclude ground-fault protection altogether. This paper explores the nature of circulating currents in UPS-supplied power systems when solid system grounding is employed and the use of modified-differential ground fault protection to eliminate the effects of these circulating currents. In addition, the alternative of high-resistance grounding for this application is discussed, along with its advantages and disadvantages.

Author

Bill Brown Square D Critical Power Competency Center
Vendor:
Square D Critical Power Competency Center
Posted:
12 Feb 2009
Published
12 Feb 2009
Format:
PDF
Length:
17 Page(s)
Type:
White Paper
Language:
English

This resource is no longer available.