kVA

Definition

kVA stands for kilo-volt-amperes, a unit of apparent power in an electrical circuit, equal to 1,000 volt-amperes.

Purpose

The purpose of measuring apparent power in kVA is to quantify the total power in an electrical circuit, including both real power (measured in kilowatts) and reactive power. It is commonly used in power distribution and electrical engineering.

Examples of Use

1. Power Transformers: The capacity of power transformers is often rated in kVA to indicate the total power they can handle.
2. Generators: Electrical generators are rated in kVA to specify their output capacity, ensuring they can supply sufficient power to connected loads.
3. UPS Systems: Uninterruptible power supply (UPS) systems are rated in kVA to determine their ability to provide backup power during outages.

Related Terms

• Kilowatt (kW): A unit of real power in an electrical circuit.
• Volt-Ampere (VA): A unit of apparent power, equal to the product of voltage and current.
• Power Factor: A ratio of real power to apparent power, indicating the efficiency of power usage.

Notes

Apparent power in kVA includes both the usable power and the power lost due to reactance in the circuit. It is an important measure for designing and managing electrical systems to ensure they operate efficiently and effectively.