1. What is Voltage To Ground?

Voltage to ground is the voltage between a given conductor and ground in a three-phase electrical system. It's a crucial measurement for electrical safety and system design.

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)
• \( \sqrt{3} \) — Mathematical constant (≈1.732)

Explanation: In a balanced three-phase system, the voltage between any phase conductor and ground is the phase voltage divided by the square root of three.

3. Importance of Voltage To Ground Calculation

Details: Knowing voltage to ground is essential for proper insulation coordination, safety clearances, and protection device settings in electrical systems.

4. Using the Calculator

Tips: Enter the phase voltage in volts. The value must be positive and non-zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation valid for all three-phase systems?
A: This applies specifically to balanced three-phase systems with no neutral shift or ground faults.

Q2: 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 star systems, line voltage = √3 × phase voltage.

Q3: Does this calculation work for delta systems?
A: In ungrounded delta systems, the voltage to ground is theoretically undefined, though in practice it floats at about phase voltage.

Q4: Why is √3 used in three-phase calculations?
A: The √3 factor comes from the 120° phase difference between the three phases in a balanced system.

Q5: How does grounding affect voltage to ground?
A: In solidly grounded systems, voltage to ground equals phase voltage. In impedance grounded systems, it may be slightly higher.