Increasing Capacity of a Transformer
INCREASING TRANSFORMER CAPACITY When electric power is supplied to a locality, city or an area, transformers that are capable of handling the required power demand ,are installed. These power transformers are rated in MVAs or KVAs . The capacity for a given transformer, refers to how much electrical load can be put on this transformer . Say for a 230 / 12 volts transformer having 60 VA capacity ( Single phase) ,the maximum load can be 5 Amps on 12 V side. If the load is exceeded, the transformer will get overheated and may burn. Based upon the load requirement, appropriate transformer size is chosen for supplying electricity to a region. E.g.: A transformer rated 20 MVA can satisfy the electricity demand of an area with a load requirement of 20*0.8=16 MWatt. Where 0.8, is assumed to be the power factor. (Apparent power*power factor=Real power) Similarly, if XYZ society has a power demand of 30 MWatt, then a power transformer of capacity 30/0.8= 37.5~40 MVA needs to be installed. Ho