Title Page
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Site conducted
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Conducted on
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Prepared by
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Location
MAINTENANCE
Information
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TRANSFORMER designation
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Serial Number
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Manufacturer
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Year of Manufacture
Main Tank
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Pressure Wash
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Check condition of man tank and cooling radiators
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Check condition of all pipes and valves
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Check for Evidence of oil and/or compound leaks
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Condition of Kiosks/WTIs/wiring/fittings
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Bushings/cable boxes
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Check bushing oil levels
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Condition of Kiosks
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Torque all bolts, check for leaks
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Check bushing condition, fixings, co-ordinating gap etc
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Check HV Connections
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Check winding and oil temperature instruments and capillary tubes
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Check condition of CT secondary wiring: record resistance to earth (500V IR test >5Mohm expected)
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Examine/replace explosion vent diaphrams, release water and debris
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Examine PRD wiring, test alarm and trip
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Check surge arrester connections and indications
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Check circuit labels, phase plates and locks
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Check main and earthing connections
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Rub down and patch paint as required
Function Tests on Buchholz
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PSI to operate trip/bush button
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Volume to operate alarm/bush button
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Rubdown and patch paint as required
NER
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Check tank, bushings and HV connections
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Inspect NER for internal debris/dirt
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Check operation of heaters and thermostats
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Rubdown and patch paint as required
Tapchanger
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Pressure wash tank, remove debris, check fixings
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Drain divertors, wash down, check/dress/replace contacts as necessary
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Check operation of drive mech, lubricate/adjust as required
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Inspect outside control cubicle
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Check and clean contactors
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Check all fuses
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Check TPI on T/C and panel match
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Tapchanger Counter Reading:
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Rubdown and patch paint as required
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Check/test Drycol/Omnia/Silica breathers
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Visual Inspection of all pipework and joints
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Inspect/clean conservator sight glasses
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Function check oil level alarms
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Rubdown and patch paint as required
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Check condition of Pressure Relief Device wiring
Function Tests on Buchholz
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Inspect/clean Buchholz sight glasses
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PSI to operate trip/bush button
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Volume to operate alarm/bush button
Earthing/Auxillary Transformer
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Pressure wash
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Torque all bolts, check for leaks
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Check bushings and HV connections
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Check/replace silica gel breathers
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Visual inspection of all pipework
Marshalling Kiosks
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Check overall condition
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Check heaters and vents
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Check door seals and clean out
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Lubricate hinges, catches and locks
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Examine/clean contactors as required
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Rubdown and patch paint as required
Examine OTI/WTI capilliaries. Test Alarm and Trip
LV WTI
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Alarm
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Trip
OTI
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Alarm
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Trip
Function Tests
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Test operation of pumps and fans
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Test trip signals sent to relevant CBs
