Guide To Changing Transformer Oil

Before we get into how our how to guide on transformer oil

, lets take a step back to understand the significance of maintaining transformer oil levels.The insulation oil in a current-and-voltage transformer acts as an insulator and coolant. The dielectric characteristics of transformer oil enable safe and secure unit operation.

Over time, the oil levels and performance quality in any transformer tend to deteriorate due to age, pollution and humidity. For these reasons its important to invest in temperature gauges and oil level indicators to continually assess your transformer oil and determine when its time for a change. Changing the oil in a transformer is very essential in order to increase the operating life of a transformer.

In many countries, performing tests using oil level indicators, temperature gaugesand other standard monitoring is mandated by law. Having such a stringent law ensures the safety of the transformer.

How to Change the Oil in a Transformer

The process of changing oil in a transformer can be a cumbersome and challenging task. While changing the oil, its standard procedure to also check the transformer for any problems, and clean equipment before resuming operation. This is done in order to make sure there are no existing problems in the transformer. Additionally, this process aids in reducing build up in moisture levels, a leading cause of failure in transformers.

1.Before starting an oil change, make sure to go through the manufacturers manual to ensure all safety measures have been taken

2.Shut down power to the transformer and dismantle or ground all metal equipment to be used in the procedure

3.Begin by testingtransformer oil levels and insulation to identify any changes in shorts or spoilt windings

4.After completing the test, its time to drain the oil by flushing it out. Its important to get as much of the old oil out as possible

5.Now replace the drain plug and fill the transformer with fire retardant oil

6.After 4 to 5 hours, recheck the insulation of the transformer,then leave the unit to sit inoperative for 12 15 hours

7.Check for visible leaks, after which you can turn on the transformer (without load). After charging for three hours, you add load to the unit. Make a final check for leaks, pressure and temperature to identify any deviations

Taking the above steps is important to ensure complete protection for your equipment, as well as to maintain high safety standards for those executing the work in order to ensure their safety.

by: Qualitrol Corp

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