Resistance of Neutral Wire (Two-Phase Three-Wire OS) Calculator

Resistance of Neutral Wire Formula:

\[ R_{neutral} = \frac{R}{\sqrt{2}} \]

Resistance of Neutral Wire (R_neutral):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Resistance of Neutral Wire?

The Resistance of Neutral Wire in a Two-Phase Three-Wire Overhead System represents the opposition to current flow in the neutral conductor. It is calculated based on the resistance of the overhead AC conductor and follows a specific mathematical relationship.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ R_{neutral} = \frac{R}{\sqrt{2}} \]

Where:

\( R_{neutral} \) — Resistance of Neutral Wire (Ohm)
\( R \) — Resistance Overhead AC (Ohm)
\( \sqrt{2} \) — Square root of 2 (approximately 1.4142)

Explanation: The neutral wire resistance is derived from the overhead AC resistance divided by the square root of 2, which accounts for the specific electrical characteristics of the two-phase three-wire system.

3. Importance of Neutral Wire Resistance Calculation

Details: Accurate calculation of neutral wire resistance is essential for proper system design, voltage drop calculations, and ensuring balanced current distribution in two-phase three-wire overhead systems.

4. Using the Calculator

Tips: Enter the Resistance Overhead AC value in Ohms. The value must be positive and greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is the neutral wire resistance calculated differently?
A: In two-phase three-wire systems, the neutral wire carries return current from both phases, requiring a specific calculation to account for this balanced load distribution.

Q2: What are typical resistance values for overhead AC conductors?
A: Resistance values vary based on conductor material, size, and temperature, but typically range from 0.1 to 1.0 Ohm per kilometer for standard overhead conductors.

Q3: How does temperature affect the resistance calculation?
A: Resistance increases with temperature. The calculated value should be adjusted based on the operating temperature if different from the standard reference temperature.

Q4: Are there safety considerations for neutral wire sizing?
A: Yes, the neutral wire must be properly sized to handle the maximum expected current and prevent overheating, which could lead to system failure or safety hazards.

Q5: Can this formula be used for other electrical systems?
A: This specific formula applies to two-phase three-wire overhead systems. Other system configurations may require different calculations for neutral wire resistance.