High voltage circuit breaker performance

In order to meet the requirements of the power system work, but also provides a circuit breaker with rated voltage levels corresponding to the maximum operating voltage. On the 3-220KV levels and its maximum operating voltage than the rated voltage of about 15% higher; pair 330KV and above the maximum operating voltage than the rated voltage of about 10% higher. Maximum operating voltage of the circuit breaker should be long-term work reliably.
(1) Rated voltage (nominal voltage): it is characterized by the parameters of the circuit breaker dielectric strength, which is the standard voltage circuit breaker long-term work. In order to meet the requirements of the power system work, but also provides a circuit breaker with rated voltage levels corresponding to the maximum operating voltage. On the 3-220KV levels and its maximum operating voltage than the rated voltage of about 15% higher; pair 330KV and above the maximum operating voltage than the rated voltage of about 10% higher. Maximum operating voltage of the circuit breaker should be long-term work reliably.
(2) Rated current: it is characterized by long-term current capability through the circuit breaker parameters, namely the circuit breaker to allow the maximum current through continuous long-term.
(3) Rated breaking current: it is the ability to characterize the circuit breaker parameters. At rated voltage, the circuit breaker can guarantee reliable breaking the maximum current, known as the rated breaking current, the unit circuit breaker contact separation instantaneous short-circuit current kA rms periodic component numbers. When the circuit breaker, below its rated voltage grid work, the breaking current can be increased. But by the interrupter mechanical strength limitations, there is a  electric meter  breaking current, called the ultimate breaking current.
(4) Dynamic current: it is characterized by short-time current capability through the circuit breaker parameters, reflecting breaker short-circuit current withstand capacity of electric power effect. State of the circuit breaker in the closing moments or closing, the maximum allowed by the current peak is called stable electric current, also known by the current limit. Through dynamic current circuit breaker, it is not the role of electric power due to damage.
(5) closing current: is the characterization of the circuit breaker closing current capability parameters. Because the circuit breaker is turned on, the circuit may Yufu short-circuit fault, the circuit breaker closing time large short circuit current. On the one hand because the short circuit current of the electric power switch operating force weakened, on the other hand because the contact has not yet occurred before contact breakdown and arc welding of the contacts may thus cause damage to the circuit breaker. Closing the circuit breaker can be reliably maximum peak current, known as the rated making current. Rated making current and dynamic current are equal in value, both equal to the rated breaking current of 2.55 times.
(6) thermal stability and thermal stability current current duration: Executive steady current through the circuit breaker is characterized by short-time current capability parameters, but it reflects the breaker short-circuit current withstand capability of thermal effects. Is the thermal current circuit breaker in the closed state, in a certain duration, the maximum allowed current through periodic component rms, when the breaker is not due to short-term heat damage. National standards: circuit breakers rated thermal current equal to the rated breaking current. Rated thermal current duration of 2S, 2S requires more than is recommended 4S.
(7) closing time and opening time: This is the characterization of the circuit breaker operating performance parameters. Various types of circuit breaker, closing at different times, but require rapid action. Closing time is measured from the circuit breaker operating mechanism closing coil connected to the main contact contact during this time, including the circuit breaker opening time opening time and the inherent extinction time in two parts. Inherent opening time is the time from tripping coil actuator connected to the contact separation time. Extinction is the time from  Circuit breaker  to each phase arc is extinguished this time. Therefore, the opening time is also called full opening time.
(8) Operation cycle: This is characterized by the circuit breaker operating performance indicators. Short-circuit overhead line faults are mostly temporary, short-circuit current is cut off, the fault that is rapidly disappearing. Therefore, in order to improve power supply reliability and system stability, the circuit breaker should be able to withstand more than once or twice closing, breaking, or immediately after closing the action breaking ability. Such multiple times at intervals of, co-operation called operating cycle.