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Transformer kVA Formula:
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A 480V to 208V transformer is an electrical device that converts 480-volt power to 208-volt power, typically used in commercial and industrial applications to step down voltage for equipment requiring lower voltage levels.
The calculator uses the transformer kVA formula:
Where:
Explanation: This formula calculates the apparent power (kVA) rating needed for a three-phase transformer based on the current and voltage values.
Details: Proper transformer sizing is crucial for electrical system efficiency, safety, and reliability. Undersized transformers can overheat and fail, while oversized transformers are inefficient and costly.
Tips: Enter current in amperes and voltage in volts. Both values must be positive numbers. The calculator will compute the required transformer kVA rating.
Q1: Why is 1.732 used in the formula?
A: 1.732 (√3) is the mathematical constant used in three-phase power calculations to account for the phase relationship between the three phases.
Q2: What's the difference between kVA and kW?
A: kVA measures apparent power (voltage × current), while kW measures real power. The ratio between them is the power factor (PF = kW/kVA).
Q3: When should I use a 480V to 208V transformer?
A: These transformers are commonly used when you need to power 208V equipment from a 480V electrical system, such as in commercial buildings, data centers, or industrial facilities.
Q4: What safety considerations are important?
A: Always follow electrical codes, use properly rated components, ensure adequate ventilation, and have qualified electricians perform installations.
Q5: Can this calculator be used for single-phase transformers?
A: No, this calculator is specifically for three-phase transformers. For single-phase transformers, use kVA = (I × V) / 1000.