Answer / dinesh lokhande

Actually above answer is not correct as it is the full load
current.No load current is approximately 4 to 5 % of rated
full load current. hence considering the terminals (i.e HV
side or LV side) the current drawn from source will be 4 to
5 % of respective side rated current.

Answer / satya

the charging current is about 6 times the full load current
about 2000 amps but that will be for mill seconds

Answer / gunasekaran

for good transformer it should be 0.5%of full load current
for normal it may be upto 1%

Answer / pulkit

max current when on load wil be 390 amp drawn by the Hv wdg
of t/f and when on no load the transformer primary losses
occur on the basis of elctic flux principle in which when evr
the current flows in a loop,there is loss in the form of
magnetic field energy that is created arround the primary
coil.it is 1 % of the hv wdg current.

Answer / shyamkr

max. current drawn is 606.1 amps

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

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