ipment and bad weather conditions.
You can mount multiple transformers onto a single pole as long as the weight is evenly distributed and the total weight is within the safety limits of the pole. Sub-100 kVA single-phase transformers are mounted above the secondary mains. For transformers larger than 100kVA, a platform is recommended.
In case of rain or humidity, many precautions need to be taken, particularly in the case of liquid-filled transformers. Dry air needs to be continuously pumped into the gas space for about 20-30 minutes prior to service personnel entering the tank.
If the insulating liquids need to be drawn down, you need to make sure that all the equipment like containers, hoses and pumps used are clean and dry. If the equipment has been used for any other liquid before, clean all the contaminated items prior to use. Make sure that you have cleaned and dry storage containers at the ready for storing the liquid as well as filtering the liquid prior to filling up the tank again.
Maintaining a positive pressure at all times is very important, even at low temperatures. In order to allow this, sufficient gas pressure needs to be maintained. The pressure-vacuum gauge will show pressure variations with ambient temperature, which needs to be recorded on a regular basis.
Once the transformer has been set up, a final inspection has to be made prior to the unit becoming energized. Follow electrical safety protocol and alert all personnel about the lethal voltages which are present within the transformer enclosure and connection points. It needs to be made sure that the electrical connections have been properly carried out and that there is a correct low and high voltage ratio between the windings. Make sure to examine the fans, motors, thermal relays and other auxiliary devices. Also, all the windings must be checked for continuity.
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