IEEE Std C37.04-2018 pdf download – IEEE Standard for Ratings and Requirements for AC High-Voltage Circuit Breakers with Rated Maximum Voltage Above 1000 V.
3.1 Definitions For the purposes of this document, the following terms and definitions apply. The IEEE Standards Online Dictionary should be referenced for terms not defined in this clause.9 The terms and definitions applicable to this standard and to the related standards for ac high-voltage circuit breakers shall be in accordance with IEEE Std C37.20.10 and IEEE Std C37.100.5. These definitions are not intended to embrace all possible meanings of the terms. They are intended solely to establish the meanings of terms used in power switchgear. air system (for pneumatic operating mechanism): An assembly of parts and devices that provide compressed air for the operation of a circuit breaker or circuit breaker operating mechanism. amplitude factor (of transient recovery voltage): The ratio of the highest peak of the transient recovery voltage to the peak value of the normal-frequency recovery voltage. NOTE- -In tests made under one condition to simulate duty under another, as in single-phase tests made to simulate duty on three-phase ungrounded faults, the amplitude factor is expressed in terms of the duty being simulated. 10 cable charging current: Current delivered to charge the parasitic capacitance surrounding an unloaded cable. cable system: A system in which the supply side of the circuit breaker is connected with 100 m or more of cables or the equivalent capacitance. circuit breaker class C0: Circuit breaker with unspecified probability of restrike when switching capacitive current under rated conditions. Syn: class C0. circuit breaker class C1: Circuit breaker with low probability of restrike when switching capacitive current under rated conditions. Syn: class C1. circuit breaker class C2: Circuit breaker with very low probability of restrike when switching capacitive current under rated conditions. Syn: class C2. circuit breaker class M1: Circuit breaker with normal mechanical endurance. Syn: class M1.