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Three-Phase Voltage Drop Calculator Online

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The Three-Phase Voltage Drop Calculator serves as an invaluable tool in electrical engineering and construction, enabling professionals to determine the voltage drop across a three-phase electrical circuit accurately. It aids in maintaining the desired voltage levels by accounting for the impedance or resistance encountered by the electrical conductors.

Formula of Three-Phase Voltage Drop Calculator

The calculation for Voltage Drop (VD) using this calculator follows a specific formula:

VD = (sqrt(3) * I * R * L * PF) / 1000


  • VD represents the voltage drop in volts (V).
  • I stands for the current in amperes (A).
  • R denotes the resistance in ohms (Ω) per unit length of the conductor.
  • L signifies the length of the conductor in feet (ft).
  • PF indicates the power factor of the load.

This formula allows precise determination of the voltage drop experienced across the electrical system due to various factors like current flow, conductor resistance, length, and power factor of the load.

General Terms Table

Search TermDescription
Voltage DropLoss of voltage in an electrical circuit due to impedance or resistance
Three-Phase SystemElectrical power transmission system using three alternating currents
ImpedanceTotal opposition offered by a circuit to the flow of alternating current
Power FactorRatio of real power to apparent power in an electrical system
Conductor ResistanceMaterial property resisting the flow of electric current

This table outlines commonly searched terms related to voltage drop and associated electrical concepts.

Example of Three-Phase Voltage Drop Calculator

Let’s consider a scenario where a three-phase electrical circuit experiences a current (I) of 50 amperes (A), a conductor resistance (R) of 0.1 ohms (Ω) per foot, a length (L) of 100 feet (ft), and a power factor (PF) of 0.8.

Plugging these values into the formula:

D = sqrt(3)​×50×0.1×100×0.8​ / 1000

This yields a voltage drop (VD) of approximately 3.46 volts (V).

Most Common FAQs

Q: What causes voltage drop in a three-phase system?

A: Voltage drop occurs due to the resistance in the conductors used for power transmission, leading to energy dissipation as heat and reduced voltage at the load end.

Q: Why is controlling voltage drop important?

A: Maintaining voltage within acceptable limits is crucial to ensure the proper functioning and efficiency of electrical equipment and systems. Excessive voltage drop can affect equipment performance and lifespan.

Q: How can voltage drop be minimized?

A: To reduce voltage drop, use larger conductors with lower resistance, minimize cable length, and consider voltage regulation techniques such as transformers.

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