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  1. Ifrat Mahmud

    Amp rating of current meters

    @Mbrooke If you want that the ground meter should show the actual unbalance current then the meter range should match ct ratio. i,e the meter current rating has to be 2000/5. From my experience meter normally can take 120% of rated value. Here you have to take the secondary current. In this...
  2. Ifrat Mahmud

    Automatic fire detection system on power transformer

    Fire protection is used to extinguish fire. So at first fire has to be detected. It can be detected by Quartzoid bulb as sushilksk has told already. But there may be false detection. Fire means oil comes out of transformer. In this circumstances differential must be operated. And device...
  3. Ifrat Mahmud

    Amp rating of current meters

    Dear, Your meters are connected through ct. A, B, C meter is for monitoring phase current. The meter rating is 2000/5 i,e if 5 amps current flows through the meter it will show 2000 A. You didn’t tell the ct ratios. Lets take it also 2000/5 i,e if 2000 A flows through power circuit(ct primary) 5...

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