Six Best Practices in Transformer Installation

Six Best Practices in Transformer Installation

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You can avoid many accidents and problems during the installation of power transformers by making sure you install them in a proper environment. Additionally, most safety hazards and difficulties can be alleviated by adhering to certain factors during transformer positioning, before set-up and connection. Furthermore, location is a determining factor in setting up the transformer as well as the safety measures that should be instituted in future. When it comes to installation of transformers, this post provides a brief overview of vital things to consider during the installation process of any pole mounted transformers as well as indoor transformers. Let’s dive straight into some of the best practices below.

Firm and Permanent Grounding

There is a need to ensure that the transformer tank is correctly installed and sized on a firm and permanent ground. This should be done before any further inspection is performed or even the unit is assembled. The poles should be able to withstand weather elements and be firmly reinforced with concrete in the ground.


The transformer liquid-filled parts should be tightly secured against extreme weather conditions such as rain or humidity. For instance, dry air should be pumped into the gas space continuously in case the humidity levels exceed 70%. On the other hand, transformers that are liquid-filled and shipped with nitrogen should be pumped with dry air for more than half an hour before any service is performed.

Fluid Inspection

In case the insulating liquid requires to be changed, there is a need to have clean and dry storage equipment ready at inspection prior to refilling the tank to filter the liquid. Additionally, all accompanying equipment such as horses and pumps are kept clean and dry. All equipment used before and had a different type of liquid must be cleaned to prevent possible contamination. Remember that the liquid level should not be less than the top windings when it is removed.

Pressure Maintenance

Sometimes, liquid-filled transformers are stored outdoors after delivery. Proper gas pressure should be instituted to maintain a positive pressure (between 1 to 2 psi) constantly, even in cases of low ambient temperature. There is also a need to take regular ambient temperature and pressure recordings. Furthermore, ensure that you adhere to the manufacturer’s instructions regarding all the accompanying accessories.

Inspection and filling

It is mandatory that you conduct a final inspection to the transformer before it is powered up. This is true especially if service experts conducted any checkups inside. To do this, ensure that all electrical connections, bushings and other draw lead connections are inspected and tightened. Do not forget to check whether any tools are left inside.


After voltage applications, make sure you keep a close eye on the transformer for the first couple of hours during operation load. You can take several days off and be back to scrutinize oxygen levels as well as dielectric power. Ensure that you have checked pressure and temperature in the transformer during and after the first week in operation. These are the few best practices you can employ to ensure you have a safe and properly working transformer. Don’t forget to carry out your own research for additional best practices you can undertake.

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