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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