Voltage Drop After Distance 500 Meters

It depends on the size of the cable, which was not specified.

There is no such thing as zero voltage drop over a length of cable, unless you have superconducting cable.

The cable is 7/44, use in pakistan,

it is natural phenomena that at long distance the resistance of wire increases, this problem can be solved if u use a transformer with tap setting, and calculate the voltage at mid of at the end calculate the voltage i.e if the voltages are 180VAC use a step up transformer whose primary is at 180 VAC and secondary at 220VAC your problem can be solved.

step voltage up at start and down at end like they do on transmission lines

http://en.wikipedia.org/wiki/Electric_power_transmission

http://www.cablecalculation.co.uk/?gclid=CLrnrM776qACFQE8lAodtFtUHg

http://www.sengpielaudio.com/calculator-cross-section.htm

http://www.martindalecenter.com/Calculators.html

How to calculate power loss in transmission cables?

Taken from other site dont ask me how to work it out Power station generates 120kW

Electricity can be transmitted either at 240V or at 24000V using a step-up transformer.

The cables have total resistance of 0.4W

What is the power loss when voltage is transmitted at:

1) 240V
2) 24000V



I AM SURE YOU CAN WORK THIS OUT USING I squared R (or as I have typed it: I^2R)

Using 240V:
P = IV, therefore I = 500A
P = I^2R = 100000W

Using 24000V:
P = IV, 120000W = I24000V, therefore I = 5A
P = I^2R = 10A

Less power loss when using higher voltage




My question begins with the premises called Ohm's law and Joules' law which lead to the textbook equations I^2R = V^2/R = P

Power loss using I^2R works out different to power loss using V^2/R, given all text books equate I^2R with V^2/R

THIS FAILS TO WORK WITH ABOVE QUESTION!

Infact P=V^/R indicates greater power loss at higher voltages (for same resistance), negating the idea of stepping up voltages to reduce power loss in electrical transmission. like this one its simple http://www.electacourse.com/cableselector.html http://www.csgnetwork.com/wiresizecalc.html Hope this lot has been of use

There is no way you can avoid voltage drop, you can decrease it using higher size of cable. Consideration of voltage drop within the limit is part of the cable selection.

500 meter is pretty long for 220V, 1 Phase. However, you have to select the larger size of cables (or more cables in parallel) to compensate the voltage drop. You need the maximum load current and cable resistance (ohm/km from the manufacturer) for voltage drop calculation. Once you have it, calculate the voltage drop (in %) using the formula from http://cr4.globalspec.com/comment/535743. Make sure your voltage drop is within 3%. If it exceeds 3%, select the next higher size cable and calculate it again until the voltage drop is within 3%.

You can go for the suggestions by others (use automatic on load tap changing transformer at load end or two different transformers at both ends) but the larger size (or parallel) cables will be more economical (as well as hassle free) than those options.

- MS

Thanks for giving me advice,

My friend told me that if we are installed High value capacitors in the middle of cable and the load end side, the voltage will become stable....do you know about this idea, because i am not sure...plesase tell me about this idea..

I am waiting,

Munawer Hussain,

Well Munawer, i am not pretty sure about this.. but this idea works.

this is called Reactive power compensation. since reactive power helps to control the voldtage drop, thus if u generate the reactive power, it can maintain the desired level of the voltage. If u are not generating the reactive power, the capacitors banks can induce reactive power and hence might control your voltage drop,.

But you need to study about the capacity of the capacitor bank, the drop that occurs with particular wire sizing.

You can also use other deives to compensate the reactive power...

take care.. I hope it helped u

apna khayal rakhna jani.

→ British Standard 7671.