This IEEE Std C37.06-2009, identifies preferred ratings of circuit breakers and does not exclude use of circuit-breaker characteristics not identified in this standard.The major focus of this revision is to add the ratings tables to coordinate with the revised scheme for presentation of transient recovery voltage (TRV). The new TRV scheme has been defined and elaborated in IEEE Std C37.04b-2008, IEEE PC37.09b (Draft 3, September 2009), and IEEE Std C37.010-2005. This revision brings ANSI C37.06-2000 into harmony with those documents. The manner of representing the TRV has been changed as part of a major effort to harmonize with the TRV requirements in IEC 62271-100:2008. Accompanying this change in the TRV representation is the introduction of the rate of rise of recovery voltage (RRRV) ratings. The representation of TRV in this revision is harmonized with IEC. (A joint IEEE and IEC task force working group was established to solve the problem of TRV envelopes). The new TRV capability of circuit breakers according to IEEE Std C37.04b-2008 is described by two- or four-parameter envelopes rather than the former “1–cosine” and “exponential-cosine” envelopes used in previous editions of this standard. The two-parameter method is used on voltages below 100 kV, and the four-parameter method is used at 100 kV and above. Comprehensive explanations of the two-parameter and the four-parameter methods are provided in this standard.
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