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  • Users: xabproject
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  1. xabproject

    CT Accuracy Class

    Hi, Found on the nameplate of a CT (Gas Insulated Switchgear of Japanese make): CT Ratio – 2500/1 A Turns ratio – 1/2500 Accuracy class – 0.03X700R6 Can you please explain this accuracy class? I guess, CT class is X and 0.03A is mag current at knee point voltage 700V and winding resistance...
  2. xabproject

    Soil Resistivity Measurement

    Client's specification calls for soil resistivity to be measured before and after backfilling if the thickness of back-fill exceeds 1m. Wonder why this should be done!? [ponder] Does this have any reference to IEEE 80 / 81? I am working is IEC area. Thanks in advance! If there is a separate...
  3. xabproject

    ZnO Elements in Regulating Windings of Transformers

    Dear All, Any information on the use of ZnO Elements in the Regulating Windings of Transformer will be a great help.[bigears] Thanks!
  4. xabproject

    MV Sw Gr - Wiping Contact/Momentary contact

    Client's specification calls for two (2nos) Wiping Contacts as part of the Auxiliary Switch Contacts of a 11kV Sw Gr Breaker. It also calls for "slow closing device". Can some one help me with what purpose do these serve? thanks in anticipation!
  5. xabproject

    Basics

    Dear members, Need help on some basics. I do not know whether the question is too silly or too profound. Question: The metal temperature is generally 'more' or 'less' than the surrounding ambient temperature (dry bulb).If the statement is right (it is most often seen to be so),then when is the...

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