Voltage drop calculation method for LV distribution network

[jimihieu]

Hi everyone,

Does anyone know any good method or algorithm to calculate Voltage drop for LV distribution network?

thank you

 

[bob]

Hi everyone,

Does anyone know any good method or algorithm to calculate Voltage drop for LV distribution network?

thank you

By networks do you mean several transformer sources tied together?

 

[mikehughes8]

Well, I know the formula. If your good with excel you can create a spreadsheet where you just plug in the values.

Vd = voltage drop
I = current in conductor
L = One way lenght of circuit
CM = Cross sectional area of conductor (circular mils) - can find in NEC
K = resistance in ohms of 1 circular mil foot of conductor

K = 12.9 for copper @ 75 celcius
K = 21.2 for alumininum (i doubt your using aluminum)

Single Phase

Vd = 2K x L x I / Cm

Three Phase

Vd = 1.73K x L x I / Cm

Hope that helps

 

[Smart $]

Hi everyone,

Does anyone know any good method or algorithm to calculate Voltage drop for LV distribution network?

thank you

When calculating voltage drop for networks, I've found Excel to be quite useful. Purchasing one of the engineering level programs that will do the calculations somewhat automatically is not a justifiable expenditure for me.