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<p>auxiliary transformer.  The period of switching from the first unit transformer to the next unit is designed for automatic, instantaneous operation in times when the emergency power system needs to kick in.  It is imperative that the power to unit auxiliaries not fail during a station shutdown (an occurrence known as <a href="page.php?w=Power_blackout">black-out</a> when all regular units temporarily fail). Instead, during shutdowns the <a href="page.php?w=Electric_power_transmission">grid</a> is expected to remain operational.  When problems</p><p>
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