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|What conditions are required for a transformer to operate at
low frequencies ?
|An 11kv system consisting of an underground cable to a sub
station about 300 meters away was shut down for about 10
hrs. On energising, it tripped off on earth fault about
10---20 mins later 6 times but since than it is not
tripping.its already 3 weeks now. The SPAJ was found to be
fine. what could be the cause.No test had been done to
determine the cause of the trippings till now because of
|Why current flows in nutral? As per theory there should be
no current in 3 ph explain.
|what is restircted earth fault relay,how it works? what is
diffrance btwn normal earth falut relay & restricted earth
|why battery is connected in series?
|can we use ordinary transformer in place of
autotransformer?give reasons also
|Why we use a H.T. Fuse from a thick wire, on other side we use
high rating of cables?
& Why we use less Sq. mm Cable on H.T. side , on other side we use Large Sq. mm cable?
|how steam converted into electricity in power plant
State the difference between Three winding transformers and
Two winding transformers ? where its used?
|what will be happen if we apply D.C supply to the
|When charging a 20 MVA , 33kV/6.6kV transformer through
regulated (0-6.6 kV or 0-33 kV) source on no load , what
will be the maximum current drawn by transformer from
source and what sould be the source capacity.
|what is stacking factor?
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