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Voltage Drop Formula:
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The voltage drop formula for 3-phase cable calculates the voltage loss in an electrical circuit due to the resistance of the cable. It is essential for ensuring proper voltage levels at the load end of the circuit.
The calculator uses the voltage drop formula:
Where:
Explanation: The formula accounts for the three-phase system by including the √3 factor, which relates to the phase difference in three-phase power systems.
Details: Accurate voltage drop calculation is crucial for designing electrical systems to ensure that the voltage at the load is within acceptable limits, preventing performance issues and potential damage to equipment.
Tips: Enter the current in amperes (A), the length of the cable in meters (m), and the resistance per unit length in ohms per kilometer (Ω/km). All values must be positive.
Q1: Why is voltage drop important in electrical systems?
A: Voltage drop can affect the performance of electrical equipment. Excessive voltage drop can lead to insufficient voltage at the load, causing equipment to operate inefficiently or fail.
Q2: What is an acceptable voltage drop?
A: Generally, a voltage drop of up to 3% for lighting circuits and 5% for power circuits is considered acceptable, but specific standards may vary.
Q3: How does cable length affect voltage drop?
A: Voltage drop increases with the length of the cable. Longer cables have higher resistance, leading to greater voltage loss.
Q4: What factors influence cable resistance?
A: Cable resistance depends on the material (e.g., copper or aluminum), cross-sectional area, and temperature.
Q5: Can this formula be used for single-phase systems?
A: No, this formula is specifically for three-phase systems. For single-phase systems, the formula is \( V_d = \frac{2 \times I \times L \times R}{1000} \).