1. What is Voltage To Ground?

Voltage to ground is the voltage between any given phase conductor and ground in a three-phase system. For a balanced wye-connected system, it's equal to the phase voltage divided by the square root of 3.

2. How Does the Calculator Work?

The calculator uses the voltage to ground formula:

Where:

• \( V_{ground} \) — Voltage to ground (volts)
• \( V_{phase} \) — Phase voltage (volts)
• \( \sqrt{3} \) — Approximately 1.732 (constant for three-phase systems)

Explanation: In a balanced three-phase wye system, the line-to-ground voltage is the phase voltage divided by √3 due to the 120° phase separation between phases.

3. Importance of Voltage To Ground Calculation

Details: Knowing voltage to ground is essential for insulation coordination, safety clearances, equipment ratings, and protection system design in power systems.

4. Using the Calculator

Tips: Enter the phase voltage in volts. The value must be positive and non-zero. The calculator will compute the corresponding voltage to ground.

5. Frequently Asked Questions (FAQ)

Q1: Is this formula valid for delta connections?
A: No, this formula is specifically for wye-connected systems. In delta connections, the voltage to ground equals the phase voltage.

Q2: Why is √3 used in three-phase calculations?
A: √3 (approximately 1.732) comes from the trigonometric relationship between phase voltages in a balanced three-phase system with 120° separation.

Q3: What's the difference between line voltage and phase voltage?
A: Line voltage is between two phases, while phase voltage is between a phase and neutral. In wye systems, line voltage = √3 × phase voltage.

Q4: Does this calculation consider unbalanced systems?
A: No, this calculator assumes a perfectly balanced three-phase system. Unbalanced systems require more complex calculations.

Q5: How does this relate to electrical safety?
A: Voltage to ground determines shock hazard potential and required insulation levels for equipment and wiring.