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Sunday, May 22, 2011

Substation Maintenance: Oil purifier / Degasifier

High vacuum oil purifier, or commonly known as degassifier, is a machine that purifies the insulating oil of high voltage equipment. Degassifier consists of heaters, vacuum pump, centrifuge pump and filters that work together inorder to improve the insulating capability of the HV equipment insulating oil.
The heater is important as this will "cooked" the insulating oil that passes through the degassifier. Through this cooking method, the water and moisture content of the insulating oil will be eliminated. The "cooked oil" will then go through an enclosed chamber. Inside this chamber, the insulating oil will be subjected to vacuum pump and centrifuge pump. The vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum (definition from Wikipedia). Therefore, this vaccum pump will remove other gases in the oil that can contribute to low level of insulation like acetylene, hydrogen, ethylene, etc. The centrifuge pump is also operated to increase the pressure of a fluid. Centrifugal pumps are commonly used to move liquids through piping(definition from Wikipedia). The constant stirring of the oil by the centrifuge pump will also make the oil vacuuming more effective. Then, the treated oil will be collected to a basin, where it will be pumped again to a filter. The resulting oil will be transferred to a collecting container where it will be ready to be pumped to the desired equipment. There are two types of degassifier, the off-load degassifier and the on-load degassifier. As the name implies, these degassifiers can be operated to an equipment which is energized (on-load) and de-energized (off-load). Degassifiers can also be used to refill a power transformer. Most of the time, only the heaters are left operational and centrifuge pump, vacuum pump and the filter are bypassed during refilling, especially when new insulating oil is being refilled.

Maintenance crew operating the degassifier

Maintenance group connecting the hoses to the intake/outlet of degassifier

For the flow sequence of the degassifier, please click here.

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  5. vaccum pump will remove other gases in the oil that can contribute to low level of insulation like acetylene, hydrogen, ethylene, etc.

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