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  2. 15 kV AC railway electrification - Wikipedia

    en.wikipedia.org/wiki/15_kV_AC_railway...

    Denmark, despite bordering only 15 kV territory decided to electrify their mainline railways at 25 kV 50 Hz for that and other reasons. [3] [4] Because it is technically very challenging and therefore not cost-effective to provide high-speed passenger services on 1.5 or 3 kV DC lines, newer European electrification primarily in Eastern Europe ...

  3. Voltage controller - Wikipedia

    en.wikipedia.org/wiki/Voltage_controller

    A Voltage controller thyristor based dimmer rack An electrical schematic for a typical SCR-based light dimmer. A voltage controller, also called an AC voltage controller or AC regulator is an electronic module based on either thyristors, triodes for alternating current, silicon-controlled rectifiers or insulated-gate bipolar transistors, which converts a fixed voltage, fixed frequency ...

  4. Utility frequency - Wikipedia

    en.wikipedia.org/wiki/Utility_frequency

    The waveform of 230 V and 50 Hz compared with 120 V and 60 Hz. The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user.

  5. Electronic speed control - Wikipedia

    en.wikipedia.org/wiki/Electronic_speed_control

    The ESC generally accepts a nominal 50 Hz PWM servo input signal whose pulse width varies from 1 ms to 2 ms. When supplied with a 1 ms width pulse at 50 Hz, the ESC responds by turning off the motor attached to its output. A 1.5 ms pulse-width input signal drives the motor at approximately half-speed.

  6. Variable-frequency drive - Wikipedia

    en.wikipedia.org/wiki/Variable-frequency_drive

    Small variable-frequency drive Chassis of above VFD (cover removed). A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, variable voltage variable frequency drive, or drive) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by varying the frequency of the ...

  7. IEEE 1902.1 - Wikipedia

    en.wikipedia.org/wiki/IEEE_1902.1

    IEEE 1902.1 supports the design of networks constituted by two devices: Controllers and Responders, based on a simplified IEEE MAC layer.The Controller initiates a command request and the Responder detects the request, processes some functions like measuring pressure, temperature or activating a relay, before sending a Response packet back to the Controller.

  8. 25 kV AC railway electrification - Wikipedia

    en.wikipedia.org/wiki/25_kV_AC_railway...

    The first successful operational and regular use of a utility frequency system dates back to 1931, tests having run since 1922. It was developed by Kálmán Kandó in Hungary, who used 16 kV AC at 50 Hz, asynchronous traction, and an adjustable number of (motor) poles.

  9. Pennsylvania Railroad 7002 - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania_Railroad_7002

    The original No. 7002 was an E2-class locomotive built in August 1902 by the Pennsylvania Railroad's Altoona Works in Altoona, Pennsylvania. On June 15, 1902, the Pennsylvania Railroad inaugurated its new 18-hour train service from New York City to Chicago, the Pennsylvania Special-forerunner to the famed Broadway Limited. 7002 was coupled to ...

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