Resistance Using Line Losses(Two-Wire Mid-Point Earthed) Calculator

Formula Used:

\[ R = \frac{P_{loss}}{2 \times I^2} \]

Resistance Overhead DC (R):

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1. What is Resistance Using Line Losses?

The Resistance Using Line Losses calculation determines the resistance in a two-wire mid-point earthed DC system based on measured line losses and current. This helps in analyzing the efficiency and performance of overhead DC transmission lines.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ R = \frac{P_{loss}}{2 \times I^2} \]

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 total line 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 losses, optimizing transmission efficiency, and maintaining the stability of DC power systems.

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 where losses occur in both conductors of the mid-point earthed configuration.

Q2: What are typical resistance values for overhead DC lines?
A: Resistance values vary based on conductor material and size, but typically range from 0.01 to 0.1 Ohm per kilometer for standard transmission lines.

Q3: How does temperature affect resistance calculations?
A: Resistance increases with temperature. For precise calculations, temperature corrections may be necessary based on the conductor material's temperature coefficient.

Q4: Can this formula be used for AC systems?
A: No, this specific formula is designed for DC systems. AC systems require additional considerations for inductive and capacitive reactance.

Q5: What are common causes of high line losses?
A: High losses can result from excessive current, poor conductor quality, long transmission distances, or increased resistance due to environmental factors.