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  2. Short-circuit test - Wikipedia

    en.wikipedia.org/wiki/Short-circuit_test

    Currents during such events can be several times the normal rated current. The resultant forces can distort the windings or break internal connections. For large utility-scale power transformers, high-power test laboratories have facilities to apply the very high power levels representative of a fault on an interconnected grid system.

  3. 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

  4. Single-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Single-phase_electric_power

    A single-phase supply connected to an alternating current electric motor does not produce a rotating magnetic field; single-phase motors need additional circuits for starting (capacitor start motor), and such motors are uncommon above 10 kW in rating. Because the voltage of a single phase system reaches a peak value twice in each cycle, the ...

  5. Phase converter - Wikipedia

    en.wikipedia.org/wiki/Phase_converter

    An American Rotary Phase Converter with a Transformer. A phase converter is a device that converts electric power provided as single phase to multiple phase or vice versa. The majority of phase converters are used to produce three-phase electric power from a single-phase source, thus allowing the operation of three-phase equipment at a site that only has single-phase electrical service.

  6. File:Transformer equivalent circuit.svg - Wikipedia

    en.wikipedia.org/wiki/File:Transformer...

    Equivalent circuit for a single phase transformer with N P turns in the primary winding and N S in the secondary, showing: Primary winding resistance R P; Primary leakage reactance X P; Secondary winding resistance R S, referred to the primary circuit by the turns ratio squared

  7. Split-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Split-phase_electric_power

    The phase shift in Europe is 120°, as is the case with three-phase current. That is why we calculate 130 V × √ 3 = 225 V. A three-phase final step-down transformer is then used. One house gets phases A and B, the next house gets phase B and C, the third house gets phase A and C.

  8. Distribution transformer - Wikipedia

    en.wikipedia.org/wiki/Distribution_transformer

    A "transformer bank", widely used in North America: three single-phase transformers connected to make a 3-phase transformer. The low-voltage secondary windings are attached to three or four terminals on the transformer's side. In North American residences and small businesses, the secondary is often the split-phase 120/240-volt system. The 240 ...

  9. Performance and modelling of AC transmission - Wikipedia

    en.wikipedia.org/wiki/Performance_and_modelling...

    The power is transmitted from one end to another with the help of step-up and step down transformer. Most transmission lines are high-voltage three-phase alternating current (AC), although single phase AC is sometimes used in railway electrification systems.

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