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  • Users: yiefang
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  1. yiefang

    Transformer preservation

    Hi.. we have a generator transformer 350MVA which not be used for a 3 years. The last Furan analysis carried out found out the DP value is around 350. The transformer winding is still under oil without keep nitrogen. The OLTC diverter switch were removed before and only covered by blanketing...
  2. yiefang

    Replacement of OLTC

    Hi, i have a question on the replacement of On load tap changer. Usually what test to be carried out:- 1) Before replace the OLTC 2) During replace the OLTC 3) After complete the OLTC replacement.
  3. yiefang

    Vacuuming of the power transformer

    Dear All, We've a power transformer with capacity of ~ 400MVA. For the purpose of the repairing the transformer it cause the transformer were exposed with moisture for around 200 hours. Did anyone have a suggestion or opinion on the vacuuming process in order to remove the moisture inside the...
  4. yiefang

    11KV/433v 2000KVA Cast Resin

    Dear All, FYI...We had a problem with 11KV/433v 2000KVA Cast Resin Transformer. The details of transformer are as follows: 1. Type: DYHK 2. Manufacturer: ABB 3. Rated Power : 2000 KVA 4. Rated Current: 105A-2666A 5. Insulation Class: HV/LV – F/F 6. Winding Material: HV/LV – Cu/Al 7. Insulation...

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