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  1. 132kVshunt

    Earthing (grounding) transformer trip

    Thanks all. We shall do further tests and I will keep you informed of our findings.
  2. 132kVshunt

    Earthing (grounding) transformer trip

    The cable protection operated correctly and cleared the fault in 0.117 seconds The Buchholz protection on the earthing initiated the tripping of the 33kV and 132kV circuit breakers to isolate the earthing transformer 0.418 seconds after the start of the cable fault and the earthing transformer...
  3. 132kVshunt

    Earthing (grounding) transformer trip

    We have a 90MVA 132/33kV YNd1 transformer with a ZNyn1 earthing transformer on the 33kV side. Recently, during major road works, the contractor damaged a 33kV cable and the earthing transformer tripped on Buchholtz. This happened twice. After the first trip, gas was found in the Buchholtz...
  4. 132kVshunt

    Reclaimed oil in switchgear

    Can anybody (from UK) give me more details about the Suspension of normal practice (SOP) related to the use of Carless reclaimed oil in switchgear? Was this oil supplied by the switchgear manufacturer, or was it used as a replacement during maintenance? Thanks

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