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Preventive maintenance & Inspection & Test - Transformer 8 set     3150 kVA 11/3.3 kV  Brand : TIRATHAI  2 Set    3150 kVA 11/0.4 kV  Brand : TIRATHAI  4 Set     2000 kVA 11/0.4kV  Brand : TIRATHAI  2 Set   Description : 1.Inspection HV & LV bushing for sign of crack partial discharge clean / tighten 2.Inspection HV & LV insulated for sign of crack partial discharge clean / tighten 3.Inspection all gasket joints for sign of oil leak ; clean /tighten 4.Inspection Off load tap change for sign of arc ; claen / tighten / exercised 5.Inspection Oil level for sign of oil leak; top up 6.Inspection silica gel replace require on yearly basis silica gel provided by contractor 7.Inspection cable connection include grounding point for sign of loosean clean /tighten 8.Preventive maintenance shall include all accesseries of Power transformer     - 8.1 Oil temperature Indicator Oil Level Gauge ,  Pressure Relief Device Sudden Pressure Relay  - 8.2 Off load tap changer, Thermometer, Drain valve Buchholz Relay,Aux cable box , radiator 9.Oil sampling for DGA shall take during Transformer  online nomal operation 2 time / year 10.Perform DBV ( ASTM D877 ) for transformer oil as TTM 2 time/year Shall include moisture and acidity analysis 11.Function test all alarm / trip signal for ensure on Transformer protection 12 Perform Transformer inspection as below Refer Standard article 4    12.1 Widing DC resistance Test    12.2 Voltage ratio and vector Group Test    12.3 Percente Impedance/Leakage Reactance Test    12.4 Insulation power Factor Test    12.5 Insulation resistance test & PI Test    12.6 Core Insulation resistance    12.7 Excilation current Test