RET 54_ Product Guide - ABB Oy Distribution Automation - #51
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Text version of the page
Transformer TerminalRET 541, RET 543, RET 545
1MRS755543 Fig. 7Protection, 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.51