Answer / sant_c

Description Freq.
1. Checking of Transformer oil Level Weekly
2. Leakagee of Transformer oil W
3. Oil BDV test Y
4. Transformer Input &Out put terminal tightening Y
5. Eartging restiance testing Y
6. Watering to earthing M
7. Colouring of transformer if required Y

Answer / kiran

Daily check up
1)Oil level in conservator tank (Main and OLTC)
2)Oil leakages if any
3)Counter rteading of OLTC
4)Sound of Transformer
5)Hourly reading

Querterly Maint.
1)Cleaning of Transformer
2)Note down of Maximum temp of HV LV Wdg. & LV Wdg.
3)Checking of OLTC mechanisum Step by step
4)Tighting of HV & LV connection
5)Checking of gas collection in Bucholz relay, cleaning of
glass cover
6)Operation of cooling fan in manually,remote and auto mode


Yearly Maint: All above quarterly maint point plus
1)DGA Of transformer oil
2)BDV of oil
3)Insulation resistance test
4)Earth resistance test of earth pits of neutral and body
earthing
5)Protection check up

Answer / sathisha n p

1. BDV of oil
2. moisture content in the oil(gas operated relay)
3. leakage in inlet or outlet valve
3. checking the colour of silica gel(in breather)
4. oil and winding temperature

Answer / vinod

Maintenance :

1) Power Isolation of transformer with proper permit
2) Earthing of all hv/lv terminal after physical isolation.
3) Cleaning of transformer with lint free cotton.
4) Oil leakages checks for all joint
5) Silica gel re heating if reqd.
6) OLTC/OFTC local operation Check(calibration of motor
over load relay)
7) OLTC continuity check(by connecting analog meter across
across all the phase terminal and OLTC operation)
8) Alarm and trip circuit checking of OTI,WTI, MOLG, Mulsy
fire,Buchholtz of main and OLTC
9) BDV of main Oil and OLTC oil
10) PPM of oil
11) Tan delta of bushing, main Oil and OLTC oil
12) Magnetic balence
13) Ratio test in every tap
14) Winding resistance
15) Insulation resistance after LA disconnection
16) Secondary injection test of protection relays with CT &
PT test
17) Cooling Fan testing by OTI/WTI temprature (manully by
rotating the prob)
18) Other inter lock if any

Note: Normaly Annual maintenance cover most of the the
test, mainly 5 year test contain all the checks depends on
manufacture and customer check list.

Answer / venki

Answer
# 3 Daily check up
1)Oil level in conservator tank (Main and OLTC)
2)Oil leakages if any
3)Counter rteading of OLTC
4)Sound of Transformer
5)Hourly reading

Querterly Maint.
1)Cleaning of Transformer
2)Note down of Maximum temp of HV LV Wdg. & LV Wdg.
3)Checking of OLTC mechanisum Step by step
4)Tighting of HV & LV connection
5)Checking of gas collection in Bucholz relay, cleaning of
glass cover
6)Operation of cooling fan in manually,remote and auto mode


Yearly Maint: All above quarterly maint point plus
1)DGA Of transformer oil
2)BDV of oil
3)Insulation resistance test
4)Earth resistance test of earth pits of neutral and body
earthing
5)Protection check up

Answer / rashpal singh garcha

daily
1.physical appearance.
2.checking of silica gel colour (in breather).
3.sound of transformer.
4.oil leakage.
5.level of oil in conservator.
6.record oil and winding temperature.

quarterly
1.cleaning of transformer and yard.
2.tightening of hv & lv connection.
3.checking of bucholz relay,cleaning of glass cover.

yearly
1.dehydration of transformer oil.
2.check dielectric strength of oil.
3.check moisture content in oil.
4.check acidity test.
5.insulation resistance test.
6.resistance test of earthing pits.
7.protection check up.
8.tan delta test.

Answer / latika

For Power Transformer:-
1] Insulation test [P-N,S-N & P-S]- Yearly
2] BDV of Oil [top and bottom sample]- Yearly
3] Topping up of Oil if reqd.
4] Opening of all stud connentions cleaning of connectors,
washers, replacing damaged ones and reconnecting properly
both in HV and LV sides.
5] Conditioning the earth electrodes [ both body and neutral
earthings] i/c the continuty made by flats or copper wire,
tightening of joints if any, watering [weekly] in case of
hilly lands.

Beside that any urgent requirement like heavy oil
leakage, any generation of extra heat etc are to be attended
immediately.

Answer / somashekar

) Power Isolation of transformer with proper permit
2) Earthing of all hv/lv terminal after physical isolation.
3) Cleaning of transformer with lint free cotton.
4) Oil leakages checks for all joint
5) Silica gel re heating if reqd.
6) OLTC/OFTC local operation Check(calibration of motor
over load relay)
7) OLTC continuity check(by connecting analog meter across
across all the phase terminal and OLTC operation)
8) Alarm and trip circuit checking of OTI,WTI, MOLG, Mulsy
fire,Buchholtz of main and OLTC
9) BDV of main Oil and OLTC oil
10) PPM of oil
11) Tan delta of bushing, main Oil and OLTC oil
12) Magnetic balence
13) Ratio test in every tap
14) Winding resistance
15) Insulation resistance after LA disconnection
16) Secondary injection test of protection relays with CT &
PT test
17) Cooling Fan testing by OTI/WTI temprature (manully by
rotating the prob)
18) Other inter lock if any

Note: Normaly Annual maintenance cover most of the the
test, mainly 5 year test contain all the checks depends on
manufacture and customer check list.

Answer / balaram sabat

Maintenance :

1) Power Isolation of transformer with proper permit
2) Earthing of all hv/lv terminal after physical isolation.
3) Cleaning of transformer with lint free cotton.
4) Oil leakages checks for all joint
5) Silica gel re heating if reqd.
6) OLTC/OFTC local operation Check(calibration of motor
over load relay)
7) OLTC continuity check(by connecting analog meter across
across all the phase terminal and OLTC operation)
8) Alarm and trip circuit checking of OTI,WTI, MOLG, Mulsy
fire,Buchholtz of main and OLTC
9) BDV of main Oil and OLTC oil
10) PPM of oil
11) Tan delta of bushing, main Oil and OLTC oil
12) Magnetic balence
13) Ratio test in every tap
14) Winding resistance
15) Insulation resistance after LA disconnection
16) Secondary injection test of protection relays with CT &
PT test
17) Cooling Fan testing by OTI/WTI temprature (manully by
rotating the prob)
18) Other inter lock if any

Note: Normaly Annual maintenance cover most of the the
test, mainly 5 year test contain all the checks depends on
manufacture and customer check list.

Answer / pounkumar.s

transformer check list

i have seen one 8.4 MW synchronous motor in a plant located in bellary it is fixed with brushless rotary rectifier ,anybody can explain its start up principle

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