With this at least half the load can be supplied with one transformer out of service.Ĭondition for Parallel Operation of Transformerįor parallel connection of transformers, primary windings of the transformers are connected to source bus-bars and secondary windings are connected to the load bus-bars. In addition, it is preferable to have a parallel transformer for the reason of reliability. The cost of a spare unit in the case of two parallel transformers (of equal rating) is also lower than that of a single large transformer. It is usually economical to install another transformer in parallel instead of replacing the existing transformer by a single larger unit. The cost associated with maintaining the spares is less when two transformers are connected in parallel. The reliability is increased with parallel operation than to have single larger unit. The transformers are connected in parallel when load on one of the transformers is more than its capacity. For supplying a load in excess of the rating of an existing transformer, two or more transformers may be connected in parallel with the existing transformer.
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