A probabilistic method for the design of power grounding systems

Author

Sverak, Jiri G. ; Wang, Wen ; Gervais, Yvon ; DO, Xuan-Dai ; Mukhedkar, Dinkar

Author_Institution

Gibbs & Hill Inc., New York, NY, USA

Volume

7

Issue

3

fYear

1992

fDate

7/1/1992 12:00:00 AM

Firstpage

1196

Lastpage

1206

Abstract

An improved multivariable, probabilistic method for the safety analysis of power grounding systems is presented. The application of this method is demonstrated in four examples. The first three examples illustrate the practical evaluation of one new and two existing substation grounding grids when the substation is connected to an overhead distribution system. The fourth example ascertains the relative impact of a difference between the S curve of IEC Publication 479 and Dalziel´s equation for the allowable body current used in ANSI/IEEE Std 80-1986 on the validity of an exposure model based on the requirements of Std 80. In this example, the statistical data on ground faults have been taken from actual system records. Further possible refinements of the exposure model are discussed

Keywords

earthing; probability; safety; substations; ANSI/IEEE Std 80-1986; IEC Publication 479; multivariable method; overhead distribution system; power grounding systems; probabilistic method; safety analysis; substation grounding grids; Accidents; Design methodology; Fault currents; Frequency; Grounding; IEC standards; Safety; Senior members; Substations; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.141831

Filename

141831