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Generator protection using differential protection schemes

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                                 Figure : Stator biased differential protection for generator To protect the generator against the failure of winding insulation and the failure of the field circuit as well as the primemover failures, differential protection is used with biased circulating current scheme. The theory of circulating current differential protection is discussed fully in part 7. The protection scheme is shown in Fig.1.Normally differential protection is used for generators larger than or equal to 20MW.                                                                                                                ...
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What happened if generator rotate at reverse power?

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  What happened if generator rotate at reverse power? <script type="text/javascript"> atOptions = { 'key' : 'bb50abd8651834037402f57330168d33', 'format' : 'iframe', 'height' : 50, 'width' : 320, 'params' : {} }; </script> <script type="text/javascript" src="//www.highperformanceformat.com/bb50abd8651834037402f57330168d33/invoke.js"></script> ANSWER:  When the generator becomes a motor, the turbine will become its load. In the absence of steam flow, the turbine blades will be spinning in air, and can overheat, potentially causing damage to the turbine. <script type="text/javascript"> atOptions = { 'key' : '980910fc29ea585d131f649de90754ee', 'format' : 'iframe', 'height' : 90, 'width' : 728, 'params' : {} }; </script> <script type="text/javascript" src="//www.hi...
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