Answer / vinoth

In HT motors it will reduce the starting current up to 60 percent thats why we prefer star to delta conection..........but in LT motors we use Direct online starter/.......it doesnt reduce the starting current

Answer / madhu

The starting current for motors is 6 to 7 times full load current. So start-up power will be large if HT motors are delta connected. It may cause instability (voltage dip) in case small Power system. In starred HT motor starting current will be less compared to delta connected motor. So starting power is reduced. Starting torque will also be reduced. (It will not be a problem as motors are of high capacity.)

why leading pf indicates a negative sign???

1 Answers  

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Hi frnds :) plz tell me that i have 100 KVA 3 phase generator so by thumb rule 100*1.4 = 144 amps and generaly we can operate at 80% load...so it will 144*0.8 =112 amps.... so now i m confused about single phase load.....if we use that generator only for single phase the that 112 amps is total single phase load or i can give 112 amps at red 112 amps at yellow and 112 amps at blue.... i mean that total single phase load that 100 KVA generator will take is 112+112+112=336 amp ??

2 Answers   FWO,

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how to calculate the MF in meter reading

2 Answers  

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Why did call copper as a electrical conductor?

2 Answers   ABB,

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what is the size(sq.mm) of these conductors dog,rabbit,tiger,panther,mush,

8 Answers   Power Grid,

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Q.1:What protection will be used on HT and LT side of 33/0.4 KV, MVA transformer. Indicate capacities of protective device to be used. Q.2:Which types of back-up protections are used in the power transformers? What do you understand by the term over travel in the relay? Q.3:How star and delta connected winding transformer are provided from earth fault

0 Answers   MPSEB,

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What happens to an electric motor if it has poor or no ventilation. Will it burn out? If it will, how long it will run before it burn out?

5 Answers   GMC,

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HOW TO DO GRID EARTHING IN INDUSTRIES FOR A PRODUCTION BUILDING

3 Answers   Timken,

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why only 26v dc is used in aircraft and 115v ac in aircraft.

0 Answers   Jet Airways,

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how we can calculate cable size of 230v,1 hp single phase motor ? panel to motor distance is 25 meter

4 Answers  

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How to convert a two phase power into a three phase power in induction machine?

0 Answers  

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what is the voltage and ampere rating of all range of HT conductor?

1 Answers  

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