1. What is Resistance Using Line Losses?

Resistance using line losses calculates the electrical resistance in a two-wire one conductor earthed DC system based on the power losses and current flowing through the system.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Resistance Overhead DC (Ohm)
• \( P_{loss} \) — Line Losses (Watt)
• \( I \) — Current Overhead DC (Ampere)

Explanation: The formula calculates the resistance by dividing the power losses by twice the square of the current flowing through the system.

3. Importance of Resistance Calculation

Details: Accurate resistance calculation is crucial for determining power efficiency, designing electrical systems, and minimizing energy losses in overhead DC transmission lines.

4. Using the Calculator

Tips: Enter line losses in watts and current in amperes. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is the formula divided by 2?
A: The factor of 2 accounts for the two-wire system configuration in the power loss calculation.

Q2: What are typical resistance values for overhead DC lines?
A: Resistance values vary based on conductor material, size, and length, but typically range from 0.01 to 1.0 Ohm per kilometer.

Q3: How does temperature affect resistance calculations?
A: Resistance increases with temperature for most conductors. The calculator provides resistance at the measurement temperature.

Q4: Can this formula be used for AC systems?
A: No, this specific formula is designed for DC systems. AC systems require additional factors for reactance and power factor.

Q5: What is the significance of one conductor being earthed?
A: In a two-wire system with one conductor earthed, the earth serves as the return path, affecting the current distribution and power loss calculation.