Question
Download Solution PDFResistance switching is normally resorted in case of-
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFResistance switching is normally resorted in the Air blast Circuit breaker.
Resistance switching:
Circuit diagram for the resistance switching of circuit breaker is shown below.
- Resistance Switching in Circuit Breaker refers to a method adopted for dampening the over voltage transients due to current chopping, capacitive current breaking etc.
- In this method, a shunt resistance is connected across the contacts of circuit breaker.
- The main role of shunt resistance R is to limit the growth of re-strike voltage and cause it to grow exponentially up to recovery voltage.
- R is so selected that the circuit becomes critically damped then re-strike voltage rises exponentially till recovery voltage is reached.
- The value of R for critical damping is
- Resistance Switching also reduces the oscillatory growth of Re-striking Voltage
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Voltage appearing across the electrodes of circuit breaker or switching voltage
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