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[[File:KIMO TRA U2 mL Gruppe.jpg|thumb|300px|Line regenerative [[variable frequency drive]]s, showing capacitors (top cylinders) and inductors attached which f A [[variable frequency drive]] (VFD) or variable speed drive (VSD) describes the electronic portio ...

...rmat when triggered by conditions detected on the power system. Harmonics, frequency, and voltage are examples of data captured by DFRs. ;Load [[Tap (transformer)|tap]] changer (LTC): Load tap changers are devices used to change the tap position on transformers. These devices ...

...nary" component of impedance, or the resistance to AC signals at a certain frequency. Capacitive reactance is equal to 1/(2⋅π⋅f⋅C), and inductive reactance is e ...ows for performance evaluation of generators, voltage regulators, load tap changers, conductors, switchgear and other equipment.<ref name=simplex/> ...

.... Ross at Jennings Radio Manufacturing Corporation revolutionized the high-frequency-circuit vacuum switch and produced a vacuum switch with a rating of 15 kV a Experimental, radio-frequency, and early power-switching vacuum interrupters had glass enclosures. More r ...

{{short description|Frequency used on standard electricity grid in a given area}} ...English]]) or '''mains frequency''' ([[British English]]) is the nominal [[frequency]] of the oscillations of [[alternating current]] (AC) in a [[wide area sync ...

...protection from accidental use of appliances with incompatible voltage and frequency requirements. * [[Utility frequency|Frequency]] ...

...eployment of distributed generation may affect grid-wide functions such as frequency control and allocation of reserves.<ref>Math H. Bollen, Fainan Hassan ''Int ...|title=IEEE Power Engineering Society General Meeting, 2004 |chapter=Grid frequency regulation by recycling electrical energy in flywheels |journal=Power Engin ...

...ted and cooled together. Reverse conducting thyristors are often used in [[frequency changer]]s and [[Inverter (electrical)|inverters]]. ...re two devices related to the thyristor that address this problem. In high-frequency applications, thyristors are poor candidates due to long switching times ar ...

[[File:Small variable-frequency drive.jpg|right|thumb|300px|Small variable-frequency drive]] ...rporating a motor) that controls [[speed]] and [[torque]] by varying the [[frequency]] of the input electricity. Depending on its [[Topology (electrical circuit ...

...c and electric power applications. Transformers range in size from [[Radio Frequency|RF]] transformers less than a cubic centimeter in volume, to units weighing ...ctive volt-ampere are each conserved; these three statements apply for any frequency above zero and periodic waveforms are conserved.<ref name="Crosby1958-145"> ...

...gnus was killed by [[List of The Transformers (TV series) characters#Multi Changers|Sixshot]]. | Was wounded by [[List of The Transformers (TV series) characters#Multi Changers|Sixshot]] in [[List of The Transformers episodes#Season 4 (1987)|The Rebirt ...