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In an existing power plant (phase I) with step up transformers (3nos) with Ynd1 vector group to the 400KV bus bar,an extension power plant (phase II) with transformers (4nos) with Ynd11 vector group >. what are the consequences of such configuration ,please note that % impedance are also differ i.e. 15% & 10.5% the reason was that auxiliary supply interface is at different voltage levels i.e 400v & 6.6KV in phase i and phase II respectively .please advise ! Thank you !

Question Posted / mohammed


In an existing power plant (phase I) with step up transformers (3nos) with Ynd1 vector group to the ..

Answer / mohammed

My reply was not to accept this configuration as it may cause a forced synchronize and floating currents and at the 400KV bus bsr hence false tripping during switching of remote parts of the grid !

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