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The Constant Underground AC is defined as the constant of line for a 3-phase 3-wire underground AC supply system. It represents a calculated value based on conductor volume and phase difference that characterizes the electrical properties of the transmission system.
The calculator uses the formula:
Where:
Explanation: The formula calculates the system constant by multiplying the conductor volume by the square of the cosine of the phase difference, then dividing by 1.5.
Details: Accurate calculation of the system constant is crucial for designing efficient underground AC transmission systems, optimizing conductor material usage, and ensuring proper system performance under various load conditions.
Tips: Enter conductor volume in cubic meters and phase difference in radians. Both values must be positive numbers (volume > 0, phase difference ≥ 0).
Q1: What is the significance of the 1.5 factor in the formula?
A: The 1.5 factor accounts for the specific configuration and electrical characteristics of a 3-phase 3-wire underground AC system.
Q2: How does phase difference affect the constant value?
A: Since the formula uses the square of cosine of phase difference, the constant decreases as the phase difference increases from 0 to 90 degrees.
Q3: What are typical values for conductor volume in underground systems?
A: Conductor volume varies significantly based on system capacity, but typically ranges from 0.001 to 0.1 cubic meters for standard installations.
Q4: Why is this calculation specific to 3-phase 3-wire US systems?
A: The formula and constant are specifically derived for the electrical characteristics and configuration of American 3-phase 3-wire underground systems.
Q5: Can this calculator be used for overhead transmission systems?
A: No, this calculation is specifically designed for underground AC systems and may not be accurate for overhead transmission configurations.