IEEE Std C37.09-2018 pdf download – IEEE Standard Test Procedures for AC High-Voltage Circuit Breakers with Rated Maximum Voltage Above 1 000 V.
close–open time: Interval of time between the instant when the contacts touch in the first pole during a closing operation and the instant when the arcing contacts have separated in all poles during the subsequent opening operation. NOTE—Unless otherwise stated, it is assumed that the opening release incorporated in the circuit breaker is energized at the instant when the 52a contacts close in the trip circuit during the closing operation. This represents the minimum close–open time. interrupting window: Range of arcing times for which a circuit breaker or a pole of circuit breaker is required to interrupt. loop: Part of the wave of the current embraced by two successive current zero crossings. Note that a distinction is made between a major loop and a minor loop depending on the time interval between two successive current zero crossings being longer or shorter than the half-period of the alternating component of the current. minimum arcing time: Shortest interval of time between the instant of the initiation of an arc and the instant of arc extinction. minimum clearing time: Sum of the minimum opening time, minimum relay time (0.5 cycle), and the shortest arcing time of a minor loop interruption in the phase with intermediate asymmetry that starts with a minor loop at short-circuit current initiation. Note that this definition is applicable only for the determination of the test parameters during short-circuit breaking tests according to test duty T100a in a circuit with a time constant of 45 ms. minimum opening time: Shortest possible interval of time between the initiation of the opening command signal and the instant when the arcing contacts have separated in all poles under defined operating conditions.
4. Design tests 4.1 General The design tests described in this test procedure provide methods of demonstrating the capability of a circuit breaker to meet the ratings listed in IEEE Std C37.04. This revision is not intended to imply or require that any additional tests or retesting of existing ac high-voltage circuit breakers tested and qualified to the previous edition of this standard are necessary. 4.2 Maximum voltage tests The ability of the circuit breaker to operate successfully at rated maximum voltage is demonstrated by performing short-circuit current interruption and other current switching rating tests in accordance with Table 1 and specified values of circuit transient recovery voltage (TRV), as given in IEEE Std C37.04. 4.3 Power frequency tests The ability of a circuit breaker to operate successfully at rated power frequency is demonstrated by performing all tests at rated power frequency ±10% or when tests at either 50 Hz or 60 Hz are specifically allowed by the standards to qualify for both frequencies.