Voltage drop chart

[mbrooke]

Question. Can a chart for voltage drop apply to all voltages given all other parameters are the same or does every voltage drop chart only apply to a specific voltage? I came across a chart for open wires on a typical 8 foot cross arm (and typical pole height) from an engineering paper, yet no mention of voltage being referenced.

The top translates to "voltage drop per ampere per kilometer" Bottom right to "power factor in percent"

 

[gar]

180617-2240 EDT

mbrooke:

Why would it be dependent upon supply voltage? Wire size, spacing, resistance, and LC are not dependent upon voltage.

.

 

[mbrooke]

180617-2240 EDT

mbrooke:

Why would it be dependent upon supply voltage? Wire size, spacing, resistance, and LC are not dependent upon voltage.

.

Ok, thats what I needed to know. This is MV, so I was wondering if the same rules applied as with LV.

 

[publicgood]

Ok, thats what I needed to know. This is MV, so I was wondering if the same rules applied as with LV.

Given the same load and conductor size, the only difference will be distance allowed to maintain the same %VD.

 

[GoldDigger]

What does depend on system voltage, of course, is the percentage VD as opposed to the absolute VD.

 

[mbrooke]

What does depend on system voltage, of course, is the percentage VD as opposed to the absolute VD.

Squaring of the voltage- double the voltage means 4 times the distance for the same load (half the current) or 2 x the voltage for 2x the distance at the same current (twice the load).

Only variable being that as voltage increase so does conductor spacing- so Xl goes up- VD goes up a bit as well.

 

[mbrooke]

Given the same load and conductor size, the only difference will be distance allowed to maintain the same %VD.

Thanks