Transformers have any way of cooling
According to the requirements of the transformer selection guide, the choice of cooling method is recommended as follows:
1, oil leaching from the cold
???31500kVA and below, 35kV and below products;
???50000kVA and below, 110kV products.
2, oil-immersed air-cooled
???12500kVA ~ 63000kVA, 35kV ~ 110kV products;
???75000kVA below, 110kV products;
???40000kVA and below, 220kV products.
3, forced oil circulation air-cooled
???50000 ~ 90000kVA, 220kV products.
4, forced oil circulation water cooling
???General hydropower plant up and down 220kV and above, 60MVA and above products used.
5, forced to guide the oil circulation air cooling or water cooling (ODAF or ODWF)
?????75000kVA and above, 110kV products;
???120000kVA and above, 220kV products;
???330kV level and 500kV grade products.
Selection of strong air-cooled cooling mode, when the pump and fan lose power supply, the transformer can not run for a long time. Even if no load can not run for a long time. Therefore, two separate power supplies should be selected for use by the cooler.
????When the oil-water cooling method is selected, it can not be operated when the pump cooling water loses power. The power supply should select two independent power supplies.
Transformers commonly used cooling methods are the following:
??1, oil immersion (ONAN);
??2, oil-immersed air-cooled (ONAF);
??3, forced oil circulation air cooling (OFAF);
??4, forced oil circulating water cooling (OFWF);
??5, forced to guide the oil circulation air cooling (ODAF);
??6, forced to guide the oil circulating water-cooled ODWF).
