Short circuit current fundamentals: Characteristics/magnitudes/definitions for high voltage circuit breaker duties
The ANSI/IEEE Standards C37 provide many sections identifying the characteristics, magnitudes and relationships for short circuit/fault currents. Also, these Standards provide many sections defining the preferred ratings that circuit breakers and/or fuses are to be capable of. The goal for this paper is to provide a general/executive summary and clear definition for Medium and High Voltage Short Circuit (SC) current rating requirements for circuit breakers and present the five stages (steps) of SC current that are derived from the Standards. It has been encountered that one commercial power system analysis program calculated fundamental SC current values correctly, but did not comply with the IEEE/ANSI Standards definition for stage 2 asymmetrical values. This mis-directed the decision of the required circuit breaker rating. There definitely is another commercial program that does provide values and definitions that comply with the Standards for all specified magnitudes in the five stages of SC current. It is important to be able to clearly understand the SC current characteristics when making circuit breaker selection. For instance, what value should be used: Asymmetrical Peak or RMS, Rated SC current, Close and Latch and/or other magnitudes. This paper will provide a guide to evaluate the required circuit breaker capability/rating, per the latest ANSI/IEEE Standards, for the supplier to comply with.
- OSTI ID:
- 427892
- Report Number(s):
- CONF-9510203-; TRN: IM9708%%219
- Resource Relation:
- Conference: IEEE/Industrial Application Society conference, Orlando, FL (United States), 8-12 Oct 1995; Other Information: PBD: 1995; Related Information: Is Part Of Conference record of the 1995 IEEE Industry Applications Society 30. IAS annual meeting. Volume 3; PB: 961 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
BTRAN AC Solid State Circuit Breaker
Power circuit breaker transient recovery voltages