Answer / nilkanth tailor

bY KEEPING FREQUENCY CONSTANT, THIER IS ONLY ONE WAY TO
INCREASE OR DECRASE THE SPEED...SUPPOSE WE HAVE f=50Hz and
N=9000...thean no pole equlas to P=120*f/N...but we got
answer is 0.66pole which is not possible...so i think we
have to incraese freq to get speed high...up to 9000...

Answer / meenakshi

u gotta increase the frequency from 50Hz to greater than
150Hz. am telling for 2 pole.but i dont think this is
practically possible.

what is stper motor

0 Answers   Bhel, WAPDA Water and Power Development Authority,

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What is Partial Discharge test .Please specify that this test can be test on 11/0.433 KV,630 KVA Transformer.

1 Answers   NBCC,

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how to calculate busbar capacity for 1000Kva transformer having22/.433V

2 Answers   Electrical Tech, L&T,

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what's the difference between ATS and AMF...??pls answer me in detail with its working principle and construction also..

3 Answers  

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the distance from my office to d.g is aprox 400mtrs and voltage drops ibn my office near about 40 volt what should i do p[ls suggest.

4 Answers  

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how capacitor pass ac voltage practically?with increase frequency and cpacitance?

1 Answers   DELL,

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why are the a.c.series motors preferred for electric traction

4 Answers  

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what is the difference between unarmoured & Flexible cable? How to identified?

0 Answers   Priyanka Electricals,

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What are safety features considered for Lifts during emergency?

1 Answers  

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types of transformers?

1 Answers   Torrent Power,

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what is the benift of HT metering & LT metering

1 Answers  

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Energy metering: On the property I am renting, the supply voltage is 2 x 110 volts. These 2 x phases enter a energy meter which then exit the meter to over head lines to my house. Question 1. The meter is single phase 240 volts but is being used as 2 x phase(2 x 110volt), is this acceptable? if not, please give me the reasons. The meter details are as follows: 60Hz 15amp Imax 100 amp Kd 3,6 Wh/R 1 fase 3 hilos Model FX 231. I think it was manufactured in Brasil From this meter, the cables run along over head aluminum conductors,I estimate the cross sectional area to be 25mm diameter, but the neutral is only about 10mm square diameter, which cover a distance of 170 meters and then terminate with an underground cable of 65 meter length, total length = 235 meters. There must be a huge voltage drop over this length. This line is protected with 2 x 200 amp aluminum fuses after the meter, there is no main switch in the distribution board. These 2 phases connect directly onto 2 busbars. Surely the neutral should be the same size as the conductors if not more? Question2. What are your thoughts about this installation, should there be better protection, is the neutral too small? During the night, the lights dim then brighten all the time, this cannot be good for my electrical appliances. In my home, I only have a small electric geyser and fridge, my stove works off gas. But when i use other appliances like the washing machine or microwave oven, the light dim. The internal wiring of this house is done with solid hard drawn copper wires and of course, they have to be under rated. I am a retired electrician by trade, but not on the metering and over head mains side, my experience is on the factory maintenance side of things. Your expertise on these matters will be greatly appreciated. Please inform me how to rectify or make any improvements Kind regards, my power bill is very expensive, so I need to know how to bring it lower. Kind regards, Brian

1 Answers  

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