The purpose of filtration is to remove the moisture and impurities in the oil, improve the electrical resistance of the oil, protect the paper insulation in the oil, but also to improve the physical and chemical properties of the oil to a certain extent.
1. The ultra-limit value of water-soluble acid is less than 4.2. There are two possible reasons for exceeding the limit: oil aging; The oil is polluted. The following countermeasures can be taken for the water-soluble acid exceeding the limit value: increasing the number of tests and comparing with the acid value to find out the reason. Oil regeneration treatment, if economical and reasonable can be done oil change treatment.
2. The maximum value of flash point is less than 130℃. Or 5℃ lower than the previous test value. There are two possible reasons for exceeding the limit: local overheating fault of the equipment; Fill the wrong oil. The following countermeasures can be taken when the flash point exceeds the limit value: to find out the cause and eliminate the fault; Vacuum oil filter degassing, or oil change.
3. The ultra-limit value of acid value is greater than 0.1MgKOH /g. There are four possible reasons for exceeding the limit: overload operation; Antioxidant consumption; Fill the wrong oil; The oil is polluted. If the acid value exceeds the limit value, the following countermeasures can be taken: investigate the cause, increase the number of tests, measure the content of antioxidant and add appropriately, carry out the regeneration treatment of transformer oil, and change the oil if the economy is reasonable.
4. The maximum value of the breakdown voltage is less than 20KV. There are two possible reasons for exceeding the limit: excessive water content in the oil; There are impurity particles in the oil. The following countermeasures can be taken for the breakdown voltage exceeding the limit value: to find out the cause, vacuum oil filter treatment, plate and frame pressure oil filter treatment or replacement of new oil. The breakdown voltage of ZJB vacuum filter oil is generally required to be more than 50KV.
On 2018-08-08 11:45:46
