1. What is a 3 Phase Voltage Drop Calculator?

Definition: This calculator estimates the voltage drop in a three-phase electrical circuit based on current, conductor length, and resistance.

Purpose: It helps electrical engineers and technicians ensure proper voltage levels in three-phase power distribution systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( VD \) — Voltage drop (volts)
• \( I \) — Current (amperes)
• \( L \) — Length of conductor (meters)
• \( R \) — Resistance per unit length (ohms/meter)

Explanation: The √3 factor accounts for the phase difference in three-phase systems, while the other variables represent the basic electrical characteristics of the circuit.

3. Importance of Voltage Drop Calculation

Details: Proper voltage drop calculation ensures electrical equipment receives adequate voltage, prevents power loss, and maintains system efficiency.

4. Using the Calculator

Tips: Enter the current in amps, conductor length in meters, and resistance in ohms per meter. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's an acceptable voltage drop?
A: Typically 3-5% of the supply voltage is acceptable, but check local electrical codes for specific requirements.

Q2: How do I find the resistance per meter?
A: Check conductor specifications or use R = ρ/A where ρ is resistivity and A is cross-sectional area.

Q3: Does this account for power factor?
A: This is the basic DC-like formula. For more precision, include power factor and reactance in calculations.

Q4: When would I use this calculation?
A: When designing or troubleshooting three-phase power circuits to ensure proper voltage at load points.

Q5: How does temperature affect the calculation?
A: Higher temperatures increase conductor resistance. For precise calculations, adjust resistance values for expected operating temperatures.