How to Decrease the Voltage Drop on the Conductor

Use larger conductors.

The voltage drop is calculeted from the resistance of the conductors, which can be obtained from manufacturers' or other standard data.

I agree with your idea. but your idea is not effeciency of economic.

do you have any different ideas?

thanks.

There is no other way. Efficiency & economy don't go hand-in-hand.

Though it may be more economically costlier to use a larger conductor. Long term savings over the life of the conductor due to power losses. And the improved efficiency of the devices by providing proper voltage over their lives in replacement cost. Could pay for itself. So it could go hand and hand.

Use superconductors...they're super-cool!

One has to buy the ticket to go by train.

Do you buy any textbooks? Looking through your previous posts "I need the documents" is a regular theme.

You don't say WHY you want to decrease the voltage drop (there are a number of possible reasons) or if the site has already been built, is being upgraded or has not been designed correctly (or at all in the case of a homework question), so here is a fairly broad list of practical ways (some are a little imaginative but all are viable solutions depending on the specific application)....

1) Increase the cross sectional area of the conductor, by either using a larger conductor or multiple conductors in parallel.

2) Change the conductor to a more conductive one, ie- use Copper instead of Aluminium.

3) Reduce the overall voltage drop by reducing the overall length of the conductor (this may not be practical for an existing site ).

4) Reduce the current! Lower current by spreading the load over more branch circuits.

5) Reduce the peak current! Lower the peak starting currents of motors by placing the motor starters and variable speed drives nearer the MSB.

6) Reduce the design current! Just lower the current the circuit is rated at.

7) Increase the size of the transformer or split the circuit and add another one to help reduce the transformer voltage drop contribution to the circuit voltage drop (yes this is not practical for most situations).

8) Change the transformer tap to increase the output voltage (while maintaining the output voltage within the legal limits of course). This works surprisingly well in certain circumstances.

9) Reduce the heating effect of the cable by mounting it differently to give better heat dissipation (if cable overloading is actually issue).

The above list also covers cable heating effect requiring de-rating of the cable, and some of the solutions are not practical for many applications (like running the variable speed drives with really long motor cables, or changing the size of the transformer).

If you were simply after an explanation on voltage drop try Wikipedia.

thanks to jack of all trades.

my site has been installed already, after I read your ways of reducing voltage drop. I regconised the way of install more conductor is suitable with my substation.

thank you again.

Glad to help. Sometimes it is the simple and obvious things in life that escape us and need to be pointed out.

Dear Mr.hungmk86,

You have not specified about the conductor size and cable laying, insulation level, derating factor used etc.

If you do not want to change to the higher size conductor etc., using capacitors to improve Power Factor so that the load current is reduced and there by the voltage drop is reduced.

DHAYANANDHAN.S