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  2. SEPTA's 25 Hz traction power system - Wikipedia

    en.wikipedia.org/wiki/SEPTA's_25_Hz_Traction...

    The 24 kV lines feed a network of 11 substations (12 including the Wayne Junction switchyard) located every 8 to 10 miles (13 to 16 km) along the electrified rail lines. Most branches are short enough to only require a single substation near the end of the line, but the Main and West Trenton lines are long enough to require intermediate ...

  3. Electrical grid - Wikipedia

    en.wikipedia.org/wiki/Electrical_grid

    Step-down substation: these transformers lower the voltage coming from the transmission lines which can be used in industry or sent to a distribution substation. Distribution substation: these transform the voltage lower again for the distribution to end users. Aside from transformers, other major components or functions of substations include:

  4. Distribution transformer - Wikipedia

    en.wikipedia.org/wiki/Distribution_transformer

    These buildings have customer-owned transformers in the basement for step-down purposes. [5] Distribution transformers are also found in wind farm power collection networks, where they step up power from each wind turbine to connect to a substation that may be several miles (kilometers) distant. [6]

  5. Electric power distribution - Wikipedia

    en.wikipedia.org/wiki/Electric_power_distribution

    Most of the world uses 50 Hz 220 or 230 V single phase, or 400 V three-phase for residential and light industrial services. In this system, the primary distribution network supplies a few substations per area, and the 230 V / 400 V power from each substation is directly distributed to end users over a region of normally less than 1 km radius.

  6. Power system protection - Wikipedia

    en.wikipedia.org/wiki/Power_system_protection

    Current and voltage transformers to step down the high voltages and currents of the electrical power system to convenient levels for the relays to deal with; Protective relays to sense the fault and initiate a trip, or disconnection, order; Circuit breakers or RCDs to open/close the system based on relay and autorecloser commands

  7. Substation - Wikipedia

    en.wikipedia.org/wiki/Substation

    The first step in planning a substation layout is the preparation of a one-line diagram, which shows in simplified form the switching and protection arrangement required, as well as the incoming supply lines and outgoing feeders or transmission lines. It is a usual practice by many electrical utilities to prepare one-line diagrams with ...

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