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  1. JonoJakarta

    THD in 20 kV side of 20/0.4 kV Transformer, 3000 kVA, Dyn-5, Year 2019

    Dear expert, I found in THD our PM5500 meter on our SM6-24 switchboard showing around 50%-52%, I was surprised. Is this coming from load side (LV/0.4 kV) or on HV side? Then, I switch off ACB on LV side of Transformer , it's mean our transformer on no-load condition I checked PM5500 meter on...
  2. JonoJakarta

    Temperature of LV transformer terminal connection is high

    Dear All, I have case in our transformer 20/0.4 kV,2500 kVA, 2002 year, DYn5, Ip, when we did IR thermograph today, 19 July 2022, we found temperature of S phase is 99 deg.C This case is repeateable case before on April 20, 2022. At that time, temperature is 102.5 deg C at same location (S...
  3. JonoJakarta

    Synchronization at 20 kV is Fail

    Dear Experts, Last 8 October 2019, we did synchronization between our generator and our grid in 20 kV networking. Our generator is 11 kV and step up by transformer 11/20 kV, 12/15 MVA. The Synchronization is fail. And 87T relay in breaker (this breaker connected between our Transformer and...

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