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  1. sivajith

    Battery Storage inverter not earhted on AC side

    Hi, I came across a design in which a grid tie inverter (110kVA at 415V) is connected to Battery system on DC side. On the AC side the inverter is connected via separate isolation transformer (delta -star). delta on inverter end and Star on utility end. Hence the inverter AC side is ungrounded...
  2. sivajith

    Earth grid testing

    Can we perform earth grid testing for a substation while it is energized. I have come across some test units that injects current at different frequencies other than 50Hz for this purpose?
  3. sivajith

    CT magnetization

    Hi, When we perform continuity check (ductor test) on a busbar we inject 100Amps current DC on to the circuit. Now if this circuit has a CT will this magnetize the CT?. When we perform CT testing we normally demagnetise the CT but if subsequently we perform this continuity check will it...
  4. sivajith

    REF protection % of winding covered

    thanks
  5. sivajith

    REF protection % of winding covered

    Hello, I'm looking for a litrature/ manual/explanation (which is availble on web) on how to calculate % of winding covered from a Resricted Earthfault setting.Can anyone shed some light on to this? Thankyou
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