SL NO MAINTENANCE/TEST NAME

1 Bushing Oil Level

2 Oil level in Conservator
3 Oil level in OLTC Conservator
4 Manual Starting of Oil Pumps & Fans
5 Checking of Oil Leak
6 Oil level in breather oil seal
7 Condition of Silica Gel
8 Transformer TAP position
1 AUTOSTARTING OF FANS AND PUMPS
2 BDV OF TRAFO OIL
3 EXTERNAL CLEANING OF ALL BUSHINGS
MAINTENANCE OF OLTC DRIVING MECHANISM
4
5 CHECKING OF REMOTE INDICATIONS OF WTI/ REMOT
6 MB OF OLTC
8 MB OF NGR
9 TB OF PRD
10 Transformer TB OF BUCHHOLZ RELAY
11 TB OF OIL SURGE RELAY
12 TB OF SPR (IF PROVIDED)
13 TB OF BUSHING CT
14 MARSHALING BOX-MAINTENANCE
Trafo insulation resistance & PI
1 WTI AND OTI SETTINGS
2 ALARM/TRIP TEST
3 NEUTRAL EARTH RESISTANCE MEASURMENT
4 TANδ MEASUREMENT FOR BUSHINGS
1 TANδ AND CAPACITANCE MEASUREMENT OF WINDIN
2 CHECKING AND CALIBRATION OF OTI AND WTI
3 CORE INSULATION TEST
1 CHECKING AND CLEANING OF DIVERTER SWITCH CON
2 WINDING RESISTANCE MEASUREMENT
1   FREQUENCY RESPONSE ANALYSIS (FRA)
2 MEASUREMENT OF VOLTAGE RATIO
3 Trafo oil DGA test

CBM checklist
a. Oil Leakage in Operating Mechanism

1 b. Oil Level in Operating Mechanism

SF-6 CIRCUIT BREAKER (PNEUMATIC OPERATING
2 MECHANISM)
3 CB timing checks
4
Breaker Pole Discrepancy Relay
5   Checking the Pressure Setting of switches
6   Healthiness Of Operation Counter
7 Maintenance of Control Cabinets
8 Measurement of Static Contact Resistance
 Dynamic Contact Resistance and Contact Travel
9 Measurement
10    Measurement of dew point in SF6 Gas (For SF6 CB)
11 SF6 Gas Leakage Test
1 Visual inspection of CT for oil leakage and crack in ins
2 Checking of bellow for expansion/ oil level
3 Marshalling Box
4 Capacitance & Tan delta Measurement
5 Current Dissolved Gas Analysis
6 transformer   Oil Parameters
7 Measurement of CT Ratio
8 Measurement of Secondary Resistance
9 Magnetising Characteristics
10 Insulation Resistance Measurement
1   Checking of Oil Leaks
2 Measurement of voltage
Visual Checking of Earthing of HF Point. (In case it is
3 not used for PLCC)

4 CAPACITIVE Checking of any breakage or cracks in HF bushing.

VOLTAGE Checking for any breakage or cracks in cementing
5
TRANSFORME joint
Cleaning of CVT Capacitor Stacks and tightness of
6 R terminal connections
MAINTENANCE Checking of Neutral Earthing in CVT MB and
7 Tightness of All connections
8 Cleaning of Marshalling Box & Junction Box
9 Checking of Space heater & illumination
10 Checking healthiness of all gaskets
11 Capacitance & Tan d Measurement of CVT
1 Checking opearting mechanism
2 isolator checking
3 Isolator & EARTH SWITCH
4 earthswitch MARSHALLING BOXES OF ISOLATORS AND EARTH SW
5 Contact Resistance Measurement-(In Micro Ohm) of I
6 Contact Resistance Measurement-(In Micro Ohm) of
Checking of Leakage by Current Analyser (mA) after
1 cleaning the porcelain surface.
2 LIGHTNING Testing by Surge Monitor kit -Counter and meter test
3 ARRESTER Cleaning of LA Insulators
4 Insulation Resistance Measurement
5 Capacitance and Tan Delta Measurement

Switchyard Thermovision
Equipment &
1 Joints
 PGCIL SIEMENS

Performing or not FREQUENCY IN MONTHS Performing or not FREQUENCY

Yes MONTHLY MAINTENANCE ACTIVITY Yes Weekly

NA NA Yes Daily

Yearly maintenance Yes Half yearly

Yes
Yes SOS Yes Half yearly/SOS

2 Years maintenance

Yes Yes yearly

Yes Yearly
4 years Yes
Yes Yes 4 years
Yes Yes 5 years
5 years
Yes Yes 5 years
Yes Yes sos
sos
Yes Yes sos
NA NA Yes Half yearly

Monthly Yes &

1.Breaker counter reading
2.Breaker SF6 gas pressure.
Yes Daily

Yes Half yearly Yes Half yearly

Yes Yes Yearly
Yes Yes Half yearly
Yes Yearly maintenance Yes yearly
Yes Yes Half yearly
Yes Yes Half yearly
Yes Yes yearly
Two years maintenance
 Two years maintenance
Yes Yes
Yes Four years Yes
Yes sos Yes sos
Yes Yes Daily
Monthly
Yes Yes Daily
Yes Yes Half yearly
Yearly maintenance
Yes Yes yearly
Yes NA NA
Yes NA NA
Yes Yes SOS
sos
Yes Yes SOS
Yes Yes sos
Yes Yes sos
Yes Monthly Yes Daily
Yes Half yearly Yes Yearly

Yes Yes yearly

Yes Yes yearly

Yes Yes yearly

Yearly maintenance
Yes Yes yearly

Yes Yes yearly

Yes Yes yearly
Yes Yes yearly
Yes Yes yearly
Yes Four years Yes yearly
Yes Yes yearly
Yes Yes yearly
Yearly maintenance
Yes Yes yearly
Yes Yes Yearly
Yes Four years NA NA
Yes Four years NA NA

Yes Yes yearly

Yearly maintenance
Yes Yes commissioing time
Yes Yes Half yearly
Yes Sos Yes yearly
Yes SOS Yes sos

Yes Yearly Yes Weekly