IEEE C37.013A:2007 pdf free download

IEEE C37.013A:2007 pdf free download.IEEE Standard for AC High Voltageenerator Circuit Breakers Rated ona Symmetrical Current Basis Amendment 1: Supplement for Usewith Generators Rated 10-100 MVA.
The transient recovery vollagc during the test shall be recorded. During a short-circuit test, the circuit- breaker characteristics such as arc voltage, post-arc conductivity, and presence of switching resistors (if any) will affect the transient recovery voltage. Thus, the test transient recovery voltage will differ from the inherent TRV wave of the test circuit upon which the performance requirements arc based to a degree depending on the characteristics of the circuit breakcr. Unless the modifying effect of thc circuit breaker is not significant and the breaking current does not contain a significant dc component, records taken during tests should not be used for assessing the inherent transient recovery voltage characteristics of the circuit:
rather, this should be done by other means. (Additional guidance is given in Annex F of IEC 62271-100. Ed. I.)
Please refer to 6.2.3.7.3 for additional information
5.10 Rated load current switching capability
Insert the following new subelause and renumber subsequent subclauses:
5.10.1 Operation endurance capability classes Ml and M2
The operation endurance capabilities specified in Table 7 indicate the type and number of complete closing opening operations that the generator circuit breaker shall be capable of performing for the operation endurance classes M I or M2. under the following conditions:
a) The generator circuit breaker shall operate with rated control voltage and rated fluid gas or liquid) pressure in the operating mechanism.
hI The frequency of operations is not to exceed two in 30 mm and four in 4 h because the generator circuit breaker may be equipped with auxiliary devices, such as resistors, that have thermal limitations. When auxiliary devices such as resistors are not used, the manufacturer may provide an alternative frequency of operation values.
c) The values listed in the rating tables have been established by experience and engineering judgment. Those involving currents are derived from service capability and circuit breaker condition (see 5.R.3.2) and are not separate ratings (see 6.2.X.2).