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Why UT, SUT secondary is rated for 6.9kV where as bus voltage is 6.6kV?

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Why UT, SUT secondary is rated for 6.9kV where as bus voltage is 6.6kV? 

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The no load secondary 6.9kV voltage level adequately takes into account voltage drop during loaded condition to cater station buses at 6.6kV level.

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