Answer / mn krishnamurthy

usage of lot of frequency drives and votage regulatiors with IGBT and SCR for heavy loads with start and stop and linear varying voltage for speed control created Harmonic currents

how to reduce the initial starting amps which is equal to the running load amps

3 Answers  

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in our sub station why we step down firstly 33kv\11kv then 11kv to 430v. can we direct step down 33v to 430.v.

18 Answers   Eaton, Siemens,

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what is balanced network and unbalanced network

1 Answers   Nalco,

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Sir, plz tell me the relation b/w KW and frequency in Variable frequency Drive?

2 Answers  

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What is the intent of short circuit studies?

3 Answers  

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In dc ckt. 24v or 110v, which one is more efficient and why?

0 Answers  

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what is the function of a starter in a motor? explain RLC circuit.

14 Answers  

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working principle of AC Servo Motor with its construction

0 Answers   TATA,

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help!!!! i bought a new house 2 yrs ago,ive just had 2 new lights fitted,when i boil the kettle,maybe 2 times in succession the safety light switch trips out,it dosnt do it straight away but it seems to do it when the kettle boils!!!!! sounds very odd to me

2 Answers  

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1. If we apply dc supply to the primary winding of transformer it will be burnt out. similarly dc supply is given to field winding of syn. motor and armature winding of dc motor, they are safe. (Remember both windings inductive nature) what is the reason behind that?

2 Answers  

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Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV

0 Answers   Bhel,

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funtion of choke

4 Answers   L&T,

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