IEEE C37.04-1999 pdf download.IEEE Standard Rating Structure for AC High-Voltage Circuit Breakers.
Abstract: This standard covers the rating stwcture for all high-voltage circuit breakers, which include all voltage ratings above 1000 V ac and comprise both indoor and outdoor types having the preferred ratings as listed in ANSI C37.06-1997. Typical circuit breakers covered by these standards have maximum voltage ratings ranging from 4.76 kV through 800 kV, and continuous current ratings of 600 A, 1200 A, 2000 A, and 3000 A associated with the various maximum voltage ratings. The rating structure establishes the basis for all assigned ratings, including continuous current, dielectric withstand voltages, short-circuit current, transient recovery voltage, and capacitor switching, plus associated capabilities such as mechanical endurance, load current, and out-ofphase switching. This standard does not cover generator circuit breakers, which are covered in IEEE Std C37.013-1 997.
Keywords: capacitance current switching, dielectric withstand, fast transient recovery voltage, indoor, initial, interrupting time, mechanical endurance, operating duty, outdoor, power frequency, ratings, related capabilities, short-circuit current, shortline fault, voltage distribution.
In 1964. consolidated standards for circuit breakers rated on a symmetrical current basis were published to take the place of standards established on the total current basis of rating. This 1999 revision was undertaken to update the standard to reflect today’s circuit breaker technology and application on modern power systems. The revision also continues harmonization with IEC 60056 Ed. 4.Oh: 1987, a process that first began in 1951.
This document makes significant changes in the rating structure for circuit breakers, such as the change of the voltage range factor. K, and the standard duty cycle. With these changes, information needed to properly apply circuit breakers rated in accordance with the 1979 or 1964 editions of IEEE Std C37.04 are eliminated from this new edition. Accordingly, users must refer to the prior editions of the relevant standards (including IEEE Std C37.04- 1999, ANSI C37.O6. IEEE Std C37.09- 1999, etc.) in order to properly select and apply circuit breakers rated in accordance with the older standards.
This standard establishes a symmetrical current rating structure and construction requirements for all indoor and outdoor types of ac high-voltage circuit breakers rated above l(XX) V. It is only applicable to three-pole circuit breakers used in three-phase systems and single-pole circuit breakers used in single-phase systems. This standard does not cover circuit breakers used at frequencies other than 50 Hz or 6() Hz, or generator circuit breakers that are covered in IEEE Std C37.013-1997.
2. References
This standard shall be used in conjunction with the following publications. When a standard is superseded by an approved revision, the revision shall apply.
ANSI C37.06-1997, American National Standard for Switchgear—AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis—Preferred Ratings and Related Required Capabilities.’
ANSI C37.06. 1-1997, American National Standard Trial-Use Guide for High-Voltage Circuit Breakers
Rated on a Symmetrical Current Basis—Designated Detinite Purpose for Fast Transient Recovery Voltage
Rise Times.”
ANSI C37.54- 1996. American National Standard for Switchgear— Indoor Alternating-Current High-Voltage
Circuit Breakers Applied as Removable Elements in Metal-Enclosed Switchgear Assemblies — Conformance
Test.IEEE C37.04-1999 pdf download.