ABB RET 541 Product Manual page 52

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Transformer Terminal
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Fig. 7 Protection, control, measurement and supervision functions of an Dyn-connected power trans-
former, implemented with RET 543 transformer terminal and an REF 543 feeder terminal. The
neutral point of the low-voltage network is earthed via a high impedance. REF 610 is used as a
backup relay on the high-voltage side. This sceme can be applied also for parallel connected
transformers.
RET 541, RET 543, RET 545
1MRS755543