The Single phase distribution transformer may be used alone for the supply of a single phase load or as one of three units in a bank for the supply of a three phase load.The unit may be direct-mounted to a wooden or concrete pole,or cluster mounted on a pole for three phase use.Oil-filled single-phase overhead transformers designed and produced by LongJian are normally used for stepping utility distribution voltages(ranging from 2400 to 34500 volts)down to lower utilization voltages.Although some are used for stepping down to commercial and industrial voltages. These transformers are also used for small substations,miscellaneous applications and can serve to step up voltages