Answer / rajkumar85

the diffrent parts in star delta starter are star contactor,
delta contactor, main contactor and mainly timer.when you
press the START button first the star contactor will engage,
and closes its contacts.at the same time main contactor also
engages through n.o of star contactor.the timer is cut the
star contact supply after a preset time delay then engages
the delta contact in to supply lines.now motor will run in
delta, (full speed).

how can we change the polarity of Alternating current rapidly? how frequency of ac can be controlled and changed easily?

0 Answers  

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How can i get my certificate of competency as an electrical supervisor? I have complicated my B.Tech from Uttarakhand technical university this year (2012).

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In LRS how much water PH value maintain for good operation of motor?

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How to calculate or testing the KW in generator

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For 160kw motor what size of cable and material is needed.?

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There are different classes of protections in power plants.class a,b,c are clear..is there any class d and e r there..and elaborate class b protection.

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what is the different ratings of ACB/VCB/SF6 which is used at HT side

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why supervision relay is used in incoming feeders?

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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why ht alternators gland plats using brass?

1 Answers   ONGC,

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Ns=120f/p. what is 120?

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what is the pi test for current transformer?

1 Answers  

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