1. What is Three Phase Voltage Drop?

Definition: Voltage drop is the reduction in voltage in an electrical circuit between the source and load due to the resistance of conductors.

Purpose: This calculator helps electrical engineers and technicians determine the voltage drop in three-phase systems to ensure proper equipment operation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( VD \) — Voltage drop (volts)
• \( I \) — Current flowing through the conductor (amps)
• \( L \) — One-way length of the conductor (meters)
• \( R \) — Resistance per unit length of the conductor (ohms/meter)

Explanation: The √3 factor accounts for the phase difference in three-phase systems. The voltage drop increases with current, conductor length, and resistance.

3. Importance of Voltage Drop Calculation

Details: Proper voltage drop calculation ensures electrical equipment receives adequate voltage for proper operation and prevents excessive power loss.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's an acceptable voltage drop?
A: Typically 3% for branch circuits and 5% for feeders, but check local electrical codes.

Q2: How do I find conductor resistance?
A: Check manufacturer specifications or use standard tables based on conductor material and size.

Q3: Does this account for power factor?
A: This is the simplified formula. For precise calculations, include power factor and reactance.

Q4: Why is length one-way?
A: In three-phase systems, current flows through one conductor to the load and returns through the other two.

Q5: How to reduce voltage drop?
A: Use larger conductors, reduce circuit length, or decrease load current.