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The voltage appearing across the contacts after the opening of the circuit breaker is called ______ voltage.

  • The voltage appearing across the contacts after the opening of the circuit breaker is called Recovery voltage.
  • When a circuit breaker opens to interrupt the current flow in an electrical circuit, an arc is created between the contacts due to the ionization of the air or gas surrounding the contacts.
  • The arc creates a conductive path between the contacts, which allows the current to continue flowing even after the contacts have physically separated.
  • As the current continues to flow through the arc, the voltage across the contacts remains high.
  • However, once the arc is extinguished, either through natural current zero or by a separate means, the voltage across the contacts drops rapidly.
  • This sudden drop in voltage can cause a transient overvoltage to appear across the contacts, which is known as recovery voltage.
  • The magnitude and duration of the recovery voltage depend on a number of factors, including the characteristics of the circuit breaker, the magnitude and duration of the fault current, and the characteristics of the power system.