Answer / mayur m budh

The neutral earthing is bound to take the maximum possible fault current all the times, so the least voltage drop and the least step potential is desired, however a body earthing, generally depending on its criticality and most of the times connected at tow diagonally opposite points is the main parallel path other than the body or supporting structure itself to carry away any fault current.
Every design has an advantage and copper is less resistive as compared to ferrous, so lesser cross section is required to connect on the neutral of a bushing or a generator.

why there is a high voltage line in multiplication of 11?i.e.- -66kv,11,kv,22kv

4 Answers   Bhel,

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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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1 Answers   ABB,

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5 Answers   RVNL,

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how much the voltage & resistance should be ,between earth & neutral points.?& why?

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what is tertiary winding in transformer?What is its purpose?

18 Answers   Bhel,

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