Answers were Sorted based on User's Feedback
Answer / iamdon
The CT secondary should not be left opened secondary due to
1)Zero current in secondary leads zero back emf.So primary
current becomes very high.Large heat generated may burn the
winding and core.If the transformer sustain this heat, even
then its operation becomes improper as explained below.
2)CT is bascially a step up transformer.So high voltage
induced in secondary may saturate the core (core becomes
permanently damaged).So the operating point advances in non
linear region,which makes the transformer operation improper
(secomdary current will not replicate the primary according
to the turn ratio).
3)High voltage induced in secondary side may endanger the
life of personnel working on the side.
|Is This Answer Correct ?||16 Yes||2 No|
Answer / bhautik patel
due to the absence of the counter ampere-turns of the secondary, the unopposed primary mmf will set up high flux in the core which will produce excessive core loss with subsequent heating & high voltage across the secondary terminals.
|Is This Answer Correct ?||3 Yes||0 No|
10. THE MOST COMMON TYPE OF THREE PHASE IN UNSYMMETRICAL FAULTS IS ........
To prove the capacity of a 10MVA transforemr with 6.5% impedance by a short circuit test how much power is needed to inject an impedance voltage if we have to arrive for its rated current?
WHAT IS THE WINDING PROCEDURE OF ELECTRICAL MOTOR
what is an alternator & generator
In vapour absorption refrigeration machine fluids used are
how electrical earthing maintenance done in industry?
Weather power factor correction needed for synchronous motors?
A system having the charactristic eqation (s+1)(s+2)(s-3)=0 is (a)stable (b)unstable (c)marginally stable (d)critically stale
Active power= VI COS FI But incase of leading power factor ( more than unity), may we use other formula ? because the cos fi (value of cos thita) should not be grater than one.
What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer?
I need bhel electrical test pattern & paper
PLEASE ANYBODY HAVE ELECTRICAL CIRCUIT DIAGRAM FOR CHMER PULSE CD 60M SPARKING MACHINE.PLEASE MAIL ME SUPRIYAAYYAPPAN@YAHOO.CO.IN.