Answer / msalam_shahin

because the flux cuts the voltage with the adjescent limbs.
say if we apply voltage in r-n leads of star connected
secondary then we can get almost 80% voltage in y-n lead
and 20% VOLTAge in b-n leads. Because the b-phase is far
away from y-phase from r-phase.... this the reason.....

Answer / k.prakashchandra

The magnetic balance test is carried out on transformer for
detection of shorted turns and core problems.As the results
recorded on individual phases are compared ,test voltages
should be the same for each phase

is earthing is necessary if we use armoured cable

1 Answers   ABB, Schwing Stetter, Siemens,

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What is the capacitance values of 132,220,400 & 765 kV current transformer

0 Answers  

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HELLO EVERYONE, I RECENTLY HAVE FOUND ONE PROBLEM, I WAS TAKING NO LOAD TRIAL OF AN HT MOTOR 920 MOTOR , 1440 RPM , 6.6 KV, WITH AUTO TRANSFORMER. AT 450 V, LOAD WAS 40 AMP AND SPEED WAS 250 RPM. BUT AS WE INCREASE VOLTAGE FROM 450 TO 480V, LOAD BECOME 41 AND SPEED REDUCED TO SOME RPM . SO WHICH PHENOMENON ACTED HERE FOR REDUCING SPEED.?? AND IS IT HAPPENING ALWAYS OR IT IS RARE? I ALSO HAVE FACED SUCH PROBLEM WITH FEW LT MOTOR ALSO.

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Explain the purpose of inductor in an electric circuit?

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how to calculate total load in a villa?

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0 Answers  

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Difference between drift current and diffusion current?

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2 Answers  

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0 Answers   Apollo, JSKE,

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