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Power Transformers Home
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Pole Transformer
A pole transformer is exactly what it sounds like, a transformer that is mounted to an electrical service pole. We see them all over the place. There are pole transformers in rural areas along with in residential neighborhoods. The pole transformer is used to convert and distribute voltage to most 120/240 power voltages. The pole transformer can range from 16 kVA to 100 kVA and they will transform volts of 11,000 to 33,000 down to a lower voltage of 400 volts. The pole transformer is usually placed on a pole that is at least 5 meters above the ground. They are designed to be of a smaller size so that they can easily be installed on a single pole structure. If the pole transformer is of a larger size, they are usually installed on a double pole structure. Pole transformers are usually inaccessible to access unless you use a cherry picker like the workers from the utility company use. This reduces the risk to animals and people from getting electrocuted along with any vandalism that could take place. The pole transformer is usually encased in a tank to protect it from exposure to harsh climate conditions. These tanks on the pole transformer have protective coatings applied to them that will reduce any corrosion that could arise. When a pole transformer is located in an area that can receive high corrosion, the tanks are then made out of stainless steel or 3CR12 steel. Most of the pole transformer tanks that are in coastal areas are sprayed with zinc. A risk factor with the pole transformer is the chance of getting hit by lightning strikes. This risk has been minimized with attaching surge arresters that fit on mounting brackets that are welded to the pole transformer tanks. Most pole transformers that you see when driving in rural and residential areas use what we call a step-down transformer. This pole transformer converts the high voltage, which is usually 7200 or 14400 volts down to standard voltage of 120/240 that is used in the home. How it works is the high voltage distribution lines are attached to the two bushings on the top and the low voltage lines attach to three terminals that are on the side of the pole transformer. The pole transformer has a secondary winding that is center tapped and grounded and this makes the two end conductors "hot" in respect to the center tap. The wires then run down to an electrical meter and breaker panel that is located inside a building. When you connect a load that is between either of the hot wires and the neutral wire, you are then getting 120 volts. When you connect between both of the hot wires, you are then getting 240 volts of electricity. This process is considered to be the set-up for single phase power, however, if three phase power is needed, then three pole transformers are mounted on the pole that have the correct KVA rating. These pole transformers for three phase power are wired in either wye or a delta transformer bank. If you need a good quality pole transformer, the TEMCo pole transformer specialists are who you need to contact. They can help you select a pole transformer that will meet your requirements and also keep your costs down. TEMCo has been around in the electrical industry for 40 years providing quality electrical products, here in the states and also worldwide. They provide solutions, not confusion, to all your needs. So utilize their experience and knowledge and get the best quality deal on all your electrical supplies. Give them a call at 1-510-490-2187, you'll be glad you did.
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