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  1. Electricrifying

    Transformers megger zero

    Dear sir's, pl advise, In a 100MVA, BHEL make Tx, found IR value between C-F , C-T is Zero, internal inspection was carried out no fault like shorting between core to frame & core to tank found, in this Tx. As pet design Frame & Tank is on same potential. After that a cable lead connected from...
  2. Electricrifying

    HV DC LINK TRIP IN VFD

    I am facing problem with my 690V,1500kw vfd unit which is 7 years old(make:Nelco),It is a 12 pulse rectifier unit driving a PD pump(Make:Geho) for dense slurry disposal with output pressure upto 160bar.It has functioned well till three months before the vfd started tripping on HV DC LINK BUS...

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