Simplifying IEEE/ANSI and IEC fault point X/R ratio for breaker evaluation

Author

Dartawan, Ketut ; Pierre, Conrad St

Author_Institution

Power Technol. Inc., Schenectady, NY, USA

fYear

2003

fDate

4-8 May 2003

Firstpage

129

Lastpage

137

Abstract

ANSI/IEEE and IEC standards provide procedures that do a fairly good job in obtaining a single fault point X/R ratio that will allow a conservative estimate of the DC component and therefore the total fault current flowing in a breaker. However, there are circuit configurations that result in overly conservative or under conservative estimates of the fault X/R ratio. This paper explores alternate methods using the information in a complex impedance network reduction and presents an alternate method that provides comparable X/R ratios and conservatism without the need to preform time consuming dual network reductions.

Keywords

ANSI standards; IEC standards; IEEE standards; circuit breakers; electrical faults; AC current flow; DC component; DC current flow; IEC fault point X/R ratio; IEEE/ANSI fault point X/R ratio; breaker evaluation; circuit configurations; complex impedance network reduction; short-circuit currents; time consuming dual network reductions; total fault current flow; Complex networks; EMTP; Equations; Fault currents; Frequency; IEC standards; Impedance;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial and Commercial Power Systems, 2003. 2003 IEEE Technical Conference

Conference_Location

St. Louis, MI, USA

Print_ISBN

0-7803-7771-0

Type

conf

DOI

10.1109/ICPS.2003.1201498

Filename

1201498