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Impact of Operating Mechanism Type on MV Vacuum Circuit Breaker Reliability

  • Document Number

    998-2095-06-09-15AR0_EN

  • Type

    White paper

  • Languages

    English

  • Date

    06/09/2015

  • Version

    1.0

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  • Document Number

    998-2095-06-09-15AR0_EN

  • Type

    White paper

  • Languages

    English

  • Date

    06/09/2015

  • Version

    1.0

Description:

Circuit-breakers main duty is to interrupt short-circuit current caused by a fault in the electrical network. As the circuit-breaker is the ultimate electrical safety device, reliable short-circuit current interruption in case of network fault is paramount. The operating mechanism is a key sub-assembly that has direct impact on the circuit breaker reliability as well as its cost and size. This paper describes the principle of operation of MV VCB mechanisms, namely solenoid, spring, and permanent magnet actuators. It provides a synthesis of the requirements imposed by IEC and ANSI standards for MV circuit-breakers as well as an overview of the needs of the main MV network applications regarding the mechanisms. Reliability aspects are examined and it is argued that MV VCB reliability in real operational conditions is not linked to the rated number of mechanical operation that a new VCB can do in a laboratory.

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Description:

Circuit-breakers main duty is to interrupt short-circuit current caused by a fault in the electrical network. As the circuit-breaker is the ultimate electrical safety device, reliable short-circuit current interruption in case of network fault is paramount. The operating mechanism is a key sub-assembly that has direct impact on the circuit breaker reliability as well as its cost and size. This paper describes the principle of operation of MV VCB mechanisms, namely solenoid, spring, and permanent magnet actuators. It provides a synthesis of the requirements imposed by IEC and ANSI standards for MV circuit-breakers as well as an overview of the needs of the main MV network applications regarding the mechanisms. Reliability aspects are examined and it is argued that MV VCB reliability in real operational conditions is not linked to the rated number of mechanical operation that a new VCB can do in a laboratory.

Files for Download

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