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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

  • Not an SAP but presumably there’s also (3) Switch downstream load off, then rack the CB out off-load and carry out tests on a dead system.

    Consider: What happens if the EUT fails?

    The best answer may depend on the make, model, age and condition of the equipment. For example, when was the busbar racking system itself last serviced and are there any known operational notices applicable to the system?

Reply

  • Not an SAP but presumably there’s also (3) Switch downstream load off, then rack the CB out off-load and carry out tests on a dead system.

    Consider: What happens if the EUT fails?

    The best answer may depend on the make, model, age and condition of the equipment. For example, when was the busbar racking system itself last serviced and are there any known operational notices applicable to the system?

Children
  • in reply to Jam

    Apologies Jam, both options are switching the downstream load off

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