Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis Amendment 2: To Change the Description of Transient Recovery Voltage for Harmonization with IEC 62271-100
"Introduction This standard has been revised to change text@ tables and figures concerning the TRV descriptions to be consistent with IEEE Std C37.04b-2008 (Amendment to IEEE Std C37.04?-1999) Entitled ""IEEE Standard for Rating Structure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis"" ?? Amendment 2: To Change the Description of Transient Recovery Voltage for Harmonization with IEC 62271-100. The major changes implemented in this revision of the standard are listed as follows: ?? The TRV capability of circuit breakers according to this amendment to IEEE Std C37.09-1999 is described by 2 or 4 parameter envelopes in place of 1-cosine and exponential-cosine envelopes. ?? Everywhere the words ""1-cosine"" appear@ they are replaced by""2-parameter."" ?? Everywhere the words ""exponential-cosine"" appear@ they are replaced by""4-parameter."" ?? Figure 6 is redrawn to replace the exponential-cosine wave forms with 4-parameter wave forms. ?? Figure 8 and Figure 9 have a label changed from ""exponential-cosine"" to ""4-parameter."" ?? Test Duties 1@ 2@ 3@ 4 and 5 are changed to T10@ T30@ T60@ T100s and T100a respectively. ?? Test Duties 4a and 4b are changed to T100s a and T100s b. ?? Test Duties 6 and 7 are changed to T100s 1Ph and T100a 1Ph. ?? Test Duties 8 and 9 are L75 and L90 (Short Line Faults at 75% and 90% respectively). ?? Test Duty 10 is changed to STC (Short Time Current)."