Static circuit breaker

Definition of static circuit breaker :

The static circuit breaker is basically semiconductor-based circuit. This circuit breaker is capable of providing a fast and also a reliable interruption current. 

The static circuit breaker is of two types :
  1. Static AC circuit breaker 
  2. Static DC circuit breaker
Here this article gives information about two circuit breaker to know more details about circuit breaker.

Static AC circuit breaker :
  • A simple arrangement of static ac circuit breaker shown in the figure. The circuit can switch on and switch off by using two thyristors SCR 1 and SCR 2.
  • When thyristor SCR 1 is turn on a positive cycle alternative supply when the switch is on condition.
  • When SCR 1 is off, the current becomes automatically zero.
  • When SCR 2 turn on the negative cycle of alternative supply.
  • SCR 1 receives the gate pulse through the diode D2 and  SCR 1 receives the gate pulse through the diode D1.
 

Static DC circuit breaker :
  • A simple arrangement of static dc circuit breaker shown in the figure given below. Force commutation is essential for turning off a thyristor device.
  • When SCR1 turn on, load voltage becomes equal to supply voltage and capacitor get charge through the circuit source voltage Vs, resistor R, capacitor C and SCR 1.
  • When breaking the circuit, SCR 2 is turned on.
  • SCR 2 turn on and  SCR 1 turn off due to reverse voltage across it.
  • The capacitor again charge +Vs to -Vs through the circuit Vs, load C and SCR 2.
  • When capacitor C is totally charged to -Vs, a current through load will be zero and the same time current through R will less than the holding current of SCR 2.
  • At that time SCR 2 will get turn off naturally, from this the value R can be determined.
Definition of static circuit breaker :

The static circuit breaker is basically semiconductor-based circuit. This circuit breaker is capable of providing a fast and also a reliable interruption current. 

The static circuit breaker is of two types :
  1. Static AC circuit breaker 
  2. Static DC circuit breaker
Here this article gives information about two circuit breaker to know more details about circuit breaker.

Static AC circuit breaker :
  • A simple arrangement of static ac circuit breaker shown in the figure. The circuit can switch on and switch off by using two thyristors SCR 1 and SCR 2.
  • When thyristor SCR 1 is turn on a positive cycle alternative supply when the switch is on condition.
  • When SCR 1 is off, the current becomes automatically zero.
  • When SCR 2 turn on the negative cycle of alternative supply.
  • SCR 1 receives the gate pulse through the diode D2 and  SCR 1 receives the gate pulse through the diode D1.
 

Static DC circuit breaker :
  • A simple arrangement of static dc circuit breaker shown in the figure given below. Force commutation is essential for turning off a thyristor device.
  • When SCR1 turn on, load voltage becomes equal to supply voltage and capacitor get charge through the circuit source voltage Vs, resistor R, capacitor C and SCR 1.
  • When breaking the circuit, SCR 2 is turned on.
  • SCR 2 turn on and  SCR 1 turn off due to reverse voltage across it.
  • The capacitor again charge +Vs to -Vs through the circuit Vs, load C and SCR 2.
  • When capacitor C is totally charged to -Vs, a current through load will be zero and the same time current through R will less than the holding current of SCR 2.
  • At that time SCR 2 will get turn off naturally, from this the value R can be determined.

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