The transformer at front has been problem and it was fixed.
Cause as following
1. Oil of coolant was leaked that it able to be getting a bank exploding the big transformer.
2.Changing for the o ring rubber of the hi positive pole for 3 pcs.
3.Changing for the o ring rubber of the low negative pole for 4 pcs.
4. filter oil to keep out of  the moisture in the oil spare tank .
5. filling for more oil 10 Litres of oil lost.
6.Protect the Hi electric pole also the low pole by the Insulation materials.
7.Labour fees cost 15000 THB .
8.Silica box has been changed (use for indicator of the moisture in the oil tank.