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Using an LV meter to measure HV power

Peter Thompson
After some assistance, if I were to use a 1:1 delta/star tx on the VT's on a HV supply, would I be able to measure HV voltage and therefore power, no I cannot configure the meter for a delta connection. Any ideas if it would work ok, and at what effect on accuracy?

  • 0
    I've NEVER seen a meter that takes HV directly - far too dangerous.


    Always use VTs & CTs to match onto the HV.


    Are you sure you mean 1:1 not HV : 110V or similar?


    Most VTs are Star/star but almost all good meters can be setup with the VT ratio and configuration and hence can calculate all 9 powers
  • 0
    Also, if you do use a delta/star VT and you can't tell the meter that, then, although the voltages readings will have the correct magnitude (assume you set the correct reverse VT ratio in the meter) the power readings will be rubbish due to the 30 deg phase shift across a delta/star VT.

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