Answer / biswajit sahoo

IT DEPENDS TYPE OF LOAD IT VARRIES FROM 20 S TO 80 SEC

Answer / srinivas

In star delta starter first star contactor will be in action after some delay time delta contactor will come in to picture and no need of time delay for star contactor.

At the time of starting motor ohmic resistance is zero and hence the back EMF zero. So it will takes more current, it may cause winding damage. So we have to reduce the starting currents. it is possible by connecting the motor terminals as star at the starting. Time delay range depends on what type of load used in motor and rating of motor. Normally the time delay range will set to reach above 70% of the motor load.

Why the standard of ambient teperature mentioned as 40 degree celcius in machines.

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why ht11kv supply needs discharging during shut down time

1 Answers  

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generaly all power generating devices is expressed in KVA or MVA then why power ststion is expressed in MW

6 Answers  

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what is the ms flat constant for calculating earth mat design calculation?

0 Answers  

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In iduction motors the current is higher than normal for both the cases when the voltage appllied is more than the rated as well as less than the rated, why?

2 Answers  

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in my industry we are using 3 step up transformers for induction heaters..i.e 415/580v and other are 11/440v.in power consumption does a step trnsformer makes any difference compared to step up?? plz explain

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prefer any good electrical engineering book.....it should be useful in the practical fied?

1 Answers  

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what are the limitations to use 33kv ac in industries?

0 Answers  

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what is power factor for any engineering equipment?? what should be its value?

3 Answers   ETA,

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What is power factor?

3 Answers   L&T,

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typical per KM resistance values of ACSR DOG conductor for 33KV & 11KV OH system? typical per KM resistance values of XLPE 300Sq mm cable for 33KV system? typical per KM resistance values of XLPE 185Sq mm cable for 11KV system?

2 Answers   wbsedcl,

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2. What are the parameters of EHT sub-station?

1 Answers   APGenco, Blue Star, Enercon,

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