voltage drop

[sonix80]

i would like to ask some help from you friends..
we have a conductor 1.6 square mm upto 80 meters. if we supply it by 220 volts, on the other end of conductor does it still deliver enough supply for the 220Vcoil voltage of a contactor be energized?

 

[nvcape]

Re: voltage drop

You need to check the information provided. #18 AWG conductor is about 9 square mm. Also, you would need to know the minimum pull in voltage and coil load.

 

[charlie b]

Re: voltage drop

I did a quick voltage drop calculation with the available information, but I had to convert to units with which I am more familiar. A slightly smaller wire (i.e., higher resistance) in a slightly longer run can operate successfully with a current as high as 2.5 amps. But I do not know the coil?s rating (in amps) or the pull-in voltage (as nvcape has already pointed out).

 

[c-h]

Re: voltage drop

1.6 mm2 is a somewhat unusual size (a #15).

I think it is a safe assumption that the current is too small to raise the temperature of the wire and that AC and DC resistance are equal. Therefore, resistivity is taken to be k = 0.0185 ohms mm2/m. If the cable is 80 m long, the conductor is 160 m. (Back and forth)

==>

resistance = resistivity x length / cross sectional area
= 0.0185 x 160 / 1.6 = 1.85 ohms

The technical specifications for the coil should tell you how much current it draws and the minimum voltage it will work with. If you know this voltage and the lowest voltage of the power source, you can figure out the maximum voltage drop you can allow.

To get the voltage drop, simply take resistance times current.

 

[sonix80]

Re: voltage drop

friends, thanks for the replies. my post would tell that i am inexperienced. your replies have helped me a lot. i have learned so much of this.