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  2. Volt-ampere - Wikipedia

    en.wikipedia.org/wiki/Volt-ampere

    A common prefixed derived unit is "kilovolt-ampere" (symbol kVA). The VA rating is limited by the maximum permissible current, and the watt rating by the power-handling capacity of the device. When a UPS powers equipment which presents a reactive load with a low power factor, neither limit may safely be exceeded. [4]

  3. Uninterruptible power supply - Wikipedia

    en.wikipedia.org/wiki/Uninterruptible_power_supply

    Most UPS below one kilovolt-ampere (1 kVA) are of the line-interactive or standby variety which are usually less expensive. For large power units, dynamic uninterruptible power supplies (DUPS) are sometimes used. A synchronous motor/alternator is connected on the mains via a choke. Energy is stored in a flywheel. When the mains power fails, an ...

  4. Per-unit system - Wikipedia

    en.wikipedia.org/wiki/Per-unit_system

    In the power systems analysis field of electrical engineering, a per-unit system is the expression of system quantities as fractions of a defined base unit quantity. . Calculations are simplified because quantities expressed as per-unit do not change when they are referred from one side of a transformer to t

  5. Buck–boost transformer - Wikipedia

    en.wikipedia.org/wiki/Buck–boost_transformer

    Buck–boost transformers can be used to power low voltage circuits including control, lighting circuits, or applications that require 12, 16, 24, 32 or 48 volts, consistent with the design's secondaries. The transformer is connected as an isolating transformer and the nameplate kVA rating is the transformer’s capacity. [2]

  6. Orders of magnitude (current) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(current)

    400 V low voltage secondary side distribution transformer with primary 12 kV; 200 kVA (up to 1000 kVA also common) [7] 10 3: 2 kA 10.5 kV secondary side from an electrical substation with primary 115 kV; 63 MVA [8] 9.3 kA 2.7V, Ultracapacitor short circuit current [9] 10 4: 25 kA Lorentz force can crusher pinch [10] 30 kA Typical lightning ...

  7. APC by Schneider Electric - Wikipedia

    en.wikipedia.org/wiki/APC_by_Schneider_Electric

    APC Smart-UPS is a line of smaller units intended for home and office use, available as floor-standing and rackmount versions. With the exception of the Smart-UPS Online series (SURT and SRT models), Smart-UPS units are line-interactive UPS systems, running their outputs off the inverters only when the grid power is unavailable.

  8. Power factor - Wikipedia

    en.wikipedia.org/wiki/Power_factor

    Power Quality Analyzers, often referred to as Power Analyzers, make a digital recording of the voltage and current waveform (typically either one phase or three phase) and accurately calculate true power (watts), apparent power (VA) power factor, AC voltage, AC current, DC voltage, DC current, frequency, IEC61000-3-2/3-12 Harmonic measurement ...

  9. Power distribution unit - Wikipedia

    en.wikipedia.org/wiki/Power_distribution_unit

    A 10-outlet rack-mount PDU (front), connected to a UPS (bottom unit on right) A temporary PDU, distributing 120 volt AC power at an outdoor event Cabinet PDU with access doors open A power distribution unit ( PDU ) is a device fitted with multiple outputs designed to distribute electric power, especially to racks of computers and networking ...

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