电机学电机学电机学 (17).ppt
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1、Electrical MachineryParallel Operation of Transformer3.3.1 Parallel Operation of TransformerAdvantage of parallel operation:(1)the reliability of power supplying is improved.(2)Adjust the number of transfers in parallel operation according the size of load to improve the work efficiency.(3)the reser
2、ve capacity can be reduced,and the new transformer can be installed by stages as power consumption increases to reduce initial investment.LoadUABUABUabUabTransformer ITransformer II3.3.1 Ideal parallel operation condition of transformer(1)For the transformers,their rated voltages of the primary side
3、 and the secondary side are respectively equal,so the transformation ratios are equal.(3)Per unit value of short-circuit impedance for transformers(short-circuit voltage)are equal,so short circuit impedance angles are equal.(2)The vector group symbols of the transformers are same;3.3.2 Parallel oper
4、ation when transformation ratios are unequalEnsure ring current not exceed the rated current by 10%when it is no-load operation.Transformation ratios are different,k k 3.3.3 Parallel operation when the vector group symbols are different Parallel operation are prohibited for the transformers whose ve
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