Worked example
No result for these values. The message above the form says which field to change.
Voltage drop, line-to-line
V
- Change as a share of nominal voltage (signed)
- %
- Receiving-end voltage, line-to-line, estimated
- V
- Series-impedance voltage magnitude
- V
- Resistive component
- V
- Reactive component (signed)
- V
Balanced three-phase first-order estimate. This is not an ampacity, protection or code-compliance result.
Underlined figures are rounded. Select one to copy its full value.
Method and assumptions
Formula
1φ: ΔU = 2IL(R cosφ ± X sinφ); balanced 3φ: ΔU = √3IL(R cosφ ± X sinφ); DC: ΔU = 2ILRLength L is one-way in kilometres; R and X are per-conductor Ω/km. Add X for lagging loads and subtract it for leading loads.
Limits of this result
- Use resistance and reactance from the actual cable or busway manufacturer at the applicable operating conditions.
- The AC result is a first-order longitudinal voltage-change approximation, intended only where total series-impedance voltage is no more than 10% of nominal circuit voltage. Outside that domain the receiving-end estimate is suppressed.
- The balanced three-phase shortcut does not model neutral current, harmonics, unbalance, starting transients or distributed loads.
- This result is not an ampacity, protection, fault-duty or jurisdictional cable-selection check.
Technical sources
Put the value to work
Read the related engineering guidance, or carry this task into System Builder to identify the signal path and EpiSensor products.