1. What is Current Using Line Losses Calculation?

The Current Using Line Losses calculation determines the electrical current flowing through a 3-phase 3-wire underground DC system based on the measured line losses and system resistance. This calculation is essential for proper system design and maintenance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Line\ Losses \) — Power losses in the system (Watt)
• \( Resistance\ underground\ DC \) — System resistance (Ohm)
• 3 — Represents the 3-phase system factor

Explanation: The formula calculates the current by taking the square root of the ratio between line losses and three times the system resistance.

3. Importance of Current Calculation

Details: Accurate current calculation is crucial for proper system sizing, protection device selection, and ensuring efficient operation of 3-phase 3-wire underground DC systems.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is the factor 3 used in the formula?
A: The factor 3 accounts for the three-phase nature of the system in the power loss calculation.

Q2: What are typical line loss values in underground DC systems?
A: Line losses typically range from 1-5% of the total system power, depending on the system design and cable specifications.

Q3: How accurate is this calculation method?
A: This method provides accurate results for balanced 3-phase 3-wire DC systems with uniform resistance values.

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 reactive power and power factor.

Q5: What factors affect system resistance in underground DC systems?
A: Cable material, cross-sectional area, length, temperature, and soil conditions all affect the overall system resistance.