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2. List of railway electrification systems - Wikipedia

   en.wikipedia.org/wiki/List_of_railway...

   Entire IR network uses the current system since 2016. Mumbai: Mumbai Suburban Railway: Conversion from 1.5 kV DC to the current system was completed in 2012 (for Western line [13]) and 2016 (for Central line [14] [15] [16]) respectively Mumbai: Mumbai Metro (Line 1) Chennai (Madras) Chennai Metro: Delhi: Delhi Metro: Hyderabad: Hyderabad Metro ...

3. Current transformer - Wikipedia

   en.wikipedia.org/wiki/Current_transformer

   Many digital clamp meters utilize a current transformer for measuring alternating current (AC). Current transformers are used extensively for measuring current and monitoring the operation of the power grid. Along with voltage leads, revenue-grade CTs drive the electrical utility's watt-hour meter on many larger commercial and industrial supplies.

4. 25 kV AC railway electrification - Wikipedia

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

   Early 50 Hz AC railway electrification in the United Kingdom was planned to use sections at 6.25 kV AC where there was limited clearance under bridges and in tunnels. Rolling stock was dual-voltage with automatic switching between 25 kV and 6.25 kV.

5. Polyphase system - Wikipedia

   en.wikipedia.org/wiki/Polyphase_system

   One voltage cycle of a three-phase system. A polyphase system (the term coined by Silvanus Thompson) is a means of distributing alternating-current (AC) electrical power that utilizes more than one AC phase, which refers to the phase offset value (in degrees) between AC in multiple conducting wires; phases may also refer to the corresponding terminals and conductors, as in color codes.

6. 15 kV AC railway electrification - Wikipedia

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

   Railway electrification using alternating current (AC) at 15 kilovolts (kV) and 16.7 hertz (Hz) are used on transport railways in Germany, Austria, Switzerland, Sweden, and Norway. The high voltage enables high power transmission with the lower frequency reducing the losses of the traction motors that were available at the beginning of the 20th ...

7. Three-phase electric power - Wikipedia

   en.wikipedia.org/wiki/Three-phase_electric_power

   Three-phase electric power (abbreviated 3ϕ [1]) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. [2] It is a type of polyphase system employing three wires (or four including an optional neutral return wire) and is the most common method used by electrical grids worldwide to transfer ...

8. Ton of refrigeration - Wikipedia

   en.wikipedia.org/wiki/Ton_of_refrigeration

   Just as horsepower and candlepower were intuitive units of measure for people living through the transition from horse to steam power [3] and from flame-based to electric lighting, so was the ton of refrigeration an intuitive unit of measure during a technological change, as the ice trade gradually included growing percentages of artificial ice ...

9. Actuator - Wikipedia

   en.wikipedia.org/wiki/Actuator

   The control signal is relatively low in energy and may be voltage, electric current, pneumatic, or hydraulic fluid pressure, or even human power [clarification needed]. [3] In the electric, hydraulic, and pneumatic sense, it is a form of automation or automatic control .