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Topic Title: CT's & PT's
Topic Summary: Maintenance of Oil immersed Current & Potential Transformers used in 33 kV Unit & 220 kV Main Substation
Created On: 02 August 2013 09:56 AM
Status: Read Only
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 02 August 2013 09:56 AM
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vvvviswavijay

Posts: 39
Joined: 11 September 2003



Hi All,

I have been reading OEM supplier manuals for oil immeresed current & potential transformers.

In every manual they had advised to use nitrogen gas with low pressure for cleaning the tank. They had advised to use in regular service or maintenance for CT's & PT's.

Request your advise for
1. it's importance
2. is it must to be carried out on regular O&M service period
3. What will it happen if we don't do it

Your answers and suggestions are welcome.

Best Regards
Vj
 05 August 2013 07:15 PM
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Zuiko

Posts: 518
Joined: 14 September 2010

It is important to monitor the health of mineral oil.

You can take a samples and send it to a good lab (if you are in the UK, EOS are good). The oil is analysed for dissolved gases which can tell you the health of your equipment.

Poor quality oil can lead to premature failure of equipment.


Service period will depend on the health of the oil. Monitoring the quality of the oil will give you your maintenance period.



As to clean the tank. I would not recommend using nitrogen gas - seems over the top; and if the windings are paper-insulated you do not want to dry the papers out.

It is important to flush the old oil out along with any contamination.
Empty the tank of oil (of course, after a correct shut-down procedure)
Spray the tank thoroughly with clean oil until the tank is spotless, then re-fill with new, clean oil.

You can use "new" oil or re-claimed oil.

New oil is significantly more expensive than re-claimed oil.
 29 August 2013 10:17 AM
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vvvviswavijay

Posts: 39
Joined: 11 September 2003

Thank You Zuiko for your valuble suggestions.

 29 August 2013 10:18 AM
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vvvviswavijay

Posts: 39
Joined: 11 September 2003

Thank You Zuiko for your valuble suggestions.

 29 August 2013 10:18 AM
User is offline View Users Profile Print this message



vvvviswavijay

Posts: 39
Joined: 11 September 2003

Thank You Zuiko for your valuble suggestions.
:cool;
IET » Energy » CT's & PT's

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