การบำรุงรักษาเชิงป้องกัน ระบบไฟฟ้า

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Gas circuit breaker

1. Visual inspection (physical inspection) and recording
2. Insulation resistance test (2.5 kV DC)
3. Contact resistance test (100A DC)
4. SF6 Pressure system test and gasket inspection
5. Motor test and Spring charged test
6. SF6 gas moisture (Dew-point) and leakage test
7. Operation time test (at normal voltage)
8. Gas Pressure switch functional test
9. Cleaning of insulator and greasing of movable operation mechanism

1. Visual inspection (physical inspection) and recording
2. Insulation resistance test (2.5 kV DC)
3. Contact resistance test (100A DC)
4. Interlocking system test
5. Operation test (Manual / Electrical)
6. Cleaning of insulator and greasing of movable operation mechanism
7. Greasing of fix and movable contact blade

H.V Current transformer & H.V Potential Transformer

1. Visual inspection (physical inspection) and recording
2. Insulation resistance test (2.5 kV DC)
3. Ratio test & Polarity test

Lightning Arrester

1. Visual inspection (physical inspection) and recording
2. Insulation resistance test (2.5 kV DC)
3. Earthing connection inspection
4. Surge Counter Operation Checked

1. Visual inspection (physical inspection) and recording
2. Insulation resistance test / Polarization index test
3. Winding resistance test
4. Ratio test
5. Buchholz / Temp. function test
6. Tap changer operation test
7. Cooling system operation test
8. Dielectric strength of oil test (Main tank and OLTC)
9. Dissolved gas analysis (DGA) of oil test (Main tank and OLTC)
10. Water content of oil test (Main tank and OLTC)
11. Protective &alarm device check

Distribution transformer and Capacitor

1. Visual inspection (physical inspection) and recording
2. Insulation resistance test / Polarization index test
3. Dielectric strength of oil test
4. Protective &alarm device check

Medium Voltage Capacitor

1. Visual inspection (physical inspection) and recording
2. Insulation resistance test / Polarization index test
3. Dielectric strength of oil test
4. Measurement Capacitance value

Medium Voltage Switchgear and MV Starter panel

1. Visual inspection (physical inspection) and recording
2. Insulation resistance test of busbar (2.5 kV DC)
3. Contact resistance of switching equipment
4. Operation test switching device (manual/electric)
5. Operation timing test
6. Spring charging test
7. Protective relay and metering device test (service setting value test)
8. Interlock function test
9. Cleaning of insulator and greasing of movable operation mechanism
10. Panel outside cleaning & waxing

1. Visual inspection (physical inspection) and recording setting value
2. Test function of relay , Service Setting and operation -Over current relay , Over current ground relay
-Over and Under Voltage relay
-Differential Reley etc.
3. Test function of interlocking circuit
4. Test of metering device
5.Test of Annunciator operation
6. Function test at Local & Remote Position
7. Cleanning & Tighting

1. Visual inspection (physical inspection) and recording
2. Operation Charge & discharge Voltage
3. Measurement Voltage per Cell

Main Distribution Board (MDB) and Motor Control Center (MCC)

1. Visual inspection (physical inspection) and recording
2. Cleaning and tightening 3. Insulation resistance test

Motor

1. Insulation resistance test
2. Visual inspection (physical inspection) and recording

Cable

1. Insulation resistance test
2. Visual inspection (physical inspection) and recording