شرح موزع الجهد المتوسط ح#8 Circuit Breaker Making and Breaking Currents and rated Voltages скачать в хорошем качестве

شرح موزع الجهد المتوسط ح#8 Circuit Breaker Making and Breaking Currents and rated Voltages

The rated short circuit breaking current of a circuit breaker is the highest rms value of short circuit current which the circuit breaker is capable of breaking under specified conditions of transient recovery voltage and power frequency voltage. It is expressed in KArms at contact separation. The rated short circuit making current of a circuit breaker is the peak value of first current loop of short circuit current (I pk)Which the circuit breaker is capable of making at its rated voltage. The power frequency withstand voltage and Impulse voltage withstand values which characterize the insulation of the circuit breaker. Power-frequency over voltages are due to regulation, ferranti effect, higher tap-setting, etc. The circuit breaker should be capable of withstanding the power frequency over-voltages which are likely to occur. These capabilities are verified by conducting power frequency voltage withstand tests and impulse voltage withstand tests. The circuit breaker is subjected to impulse over-voltage due causes like lighting surge and switching surge. #coursefree #power #volt #electrical #circuit_breaker #coursefree #mcb #power #medium #مهندس_عمرو_عفيفي