Answer / n k singh

We can use AC also but additional shading ring must be
provided which gives sufficient phase displaced flux for
relay to be continuously on in negative half cycle of AC
supply also. In case of DC the flux is unipolar hence relay
will be on if DC is available.

HOW DOES ONE SELECT A TRANSFORMER PHASOR GROUP IE, WHETHER A STAR-DELTA TR OR A STAR-STAR OR A DELTA-DELTA, ETC. TRANSFORMER IS MORE SUITABLE FOR A PARTICULAR KIND OF LOAD OR WORKING CONDITION???

3 Answers   KPTCL,

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Transformer Specification say 66/11KV, 23/27/35MVA OFDAN,what is OFDAN? we know ONAN,ONAF or OFAF

2 Answers   Siemens,

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Define what is the function of anti-pumping in circuit breaker?

0 Answers  

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Why usually in all electrical equipment taking more current in Y pahse like pumps,compressor,or any other applications

1 Answers   Chemplast,

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what is the principle of motor

6 Answers  

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suppose a fan is running with phase and neutral. if its neural is touched to body. then fan get stopped. if this fan is connected to phase and ground supply..then why it runs?

1 Answers  

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how can we determine size of a cable by knowing the kw or current rating of a load?how can we calculate the resistance box of a slip ring motor?

0 Answers   TK Group,

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Alternator rotor earth fault relay circuit

0 Answers  

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what is the purpose of supervision relay coil

1 Answers  

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Draw an S.L.D of the main panel for a hospital, showing meter position. Essential loads are: 1) Equipment load 100 KW 2) Critical load 500 KW 3) Life AID Safety load 400 KW 4) NON-Essential load 200 KW 5) Other service loads 200 KW Calculate and suggest the size of the transformer, size of main cable, capacitor bank, and calculate the capacity of an emergency load having above first three mentioned loads is supplied by an emergency generator.

0 Answers   FEWA, HMK,

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In a synchronous machine if the field axis is ahead of the armature field axis then the machine is ?

1 Answers  

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we often use the word HT (high tension) line.or we say HT switch gear, whats does HT basically mean. is it different from high voltage.

1 Answers  

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