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HV Safety advice required

E95

Hi, 

Contemplating the safest way to carry out a HV switching program

We're carrying out function checks of an existing 11kV VCB, we have two options:

  1. Switch off, rack out into a test position (only control voltage applied) and manually operate on a dead system, and then rack back into the live connections or:
  2. Switch the downstream load off, so the circuit is energised with no load and perform manual switching in front of the energised VCB

Personally I see both as having pitfalls, however I am uncertain whether manually switching 11kV VCB under no load is safer than racking into and out of live busbars

Any other important considerations to be taken into account?

Regds

Parents

  • Hi,

    I assume this is an older type of oil circuit breaker at 11kv. Do you know the manufactures type and reference type it is?

    Why do you need to do a function check? If the function check is to just open and close the breaker are you not testing protection? When was the last time this was done?

    I am an SAP amongst other things, if you are not that sure - i would suggest you look at external support. 

Reply

  • Hi,

    I assume this is an older type of oil circuit breaker at 11kv. Do you know the manufactures type and reference type it is?

    Why do you need to do a function check? If the function check is to just open and close the breaker are you not testing protection? When was the last time this was done?

    I am an SAP amongst other things, if you are not that sure - i would suggest you look at external support. 

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