Resistivity Using Line Losses (DC Three-Wire US) Calculator

Formula Used:

\[ \rho = \frac{A \times P_{line}}{2 \times l \times (C1^2)} \]

Area of Underground DC Wire:

m²

Line Losses:

Length of Wire DC:

Current Underground DC:

Resistivity:

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1. What is Resistivity Using Line Losses (DC Three-Wire US)?

Resistivity is the measure of how strongly a material opposes the flow of current through it. In DC three-wire underground systems, calculating resistivity helps in understanding the material properties and efficiency of the transmission system.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \rho = \frac{A \times P_{line}}{2 \times l \times (C1^2)} \]

Where:

\( \rho \) — Resistivity (Ω·m)
\( A \) — Area of underground DC wire (m²)
\( P_{line} \) — Line losses (W)
\( l \) — Length of wire DC (m)
\( C1 \) — Current underground DC (A)

Explanation: The formula calculates the resistivity based on the area of the wire, line losses, length of the wire, and the current flowing through it.

3. Importance of Resistivity Calculation

Details: Accurate resistivity calculation is crucial for designing efficient electrical systems, minimizing energy losses, and selecting appropriate materials for underground DC transmission.

4. Using the Calculator

Tips: Enter the area in square meters, line losses in watts, length in meters, and current in amperes. All values must be positive and non-zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is resistivity important in DC systems?
A: Resistivity determines how much a material resists the flow of electric current, affecting efficiency and heat generation in DC systems.

Q2: What are typical resistivity values for common materials?
A: Copper has low resistivity (~1.68×10⁻⁸ Ω·m), while insulators like rubber have very high resistivity (>10¹³ Ω·m).

Q3: How does temperature affect resistivity?
A: For most conductors, resistivity increases with temperature due to increased atomic vibrations.

Q4: What factors influence line losses in DC systems?
A: Line losses are influenced by current magnitude, wire resistance, length, and material properties.

Q5: Can this calculator be used for AC systems?
A: No, this formula is specifically designed for DC three-wire underground systems. AC systems require different calculations due to skin effect and other factors.