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31:, which result from plant expansions and power source additions, to levels that can be adequately handled by existing distribution equipment. They can also be used in high voltage electric power transmission grids for a similar purpose. In the control of electric motors, current limiting reactors can be used to restrict starting current or as part of a speed control system.
76:. The inductive reactance is chosen to be low enough for an acceptable voltage drop during normal operation, but high enough to restrict a short circuit to the rating of the switchgear. The amount of protection that a current limiting reactor offers depends upon the percentage increase in impedance that it provides for the system.
219:
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The main motive of using current limiting reactors is to reduce short-circuit currents so that circuit breakers with lower short circuit breaking capacity can be used. They can also be used to protect other system components from high current levels and to limit the inrush current when starting a
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is an inductor wired between a power source and a load. In addition to the current limiting function, the device serves to filter out spikes of current and may also reduce injection of harmonic currents into the power supply. The most common type is designed for
104:. Installation of air-core coils requires consideration of the magnetic field produced by the coils, which may induce current in large nearby metal objects. This may result in objectionable temperature rise and waste of energy.
51:
coils, were first presented in 1915. The inventor of the current limiting reactance coil was Vern E. Alden who filed the patent on
November 20, 1917 with an issue date of September 11, 1923. The original assignee was
121:, in which three isolated inductors are each wired in series with one of the three line phases. Line reactors are generally installed in motor driven equipment to limit starting current, and may be used to protect
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A set of air-core reactors installed outdoors at a substation. Similar reactors are used for current limiting at transmission and distribution voltage levels.
217:, Alden, Vern, "Current Limiting Reactance Coil", issued September 11, 1923, assigned to Westinghouse Electric and Manufacturing Company
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is used. At low and medium voltages, air-insulated coils are practical; for high transmission voltages, the coils may be immersed in
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290:"Electrical Transmission and Distribution Reference Book", Westinghouse Electr Corporation, Pittsburgh PA, 1950 pp. 133-135
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It is desirable that the reactor does not go into magnetic saturation during a short circuit, so generally an air-core
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Simpson, James. "The how and why of current-limiting reactors". EC&M Electrical
Construction & Maintenance.
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192:. Meeting of the Society of Mechanical, Electrical, and Steam Engineers. Boody House,
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234:"Current Limiting Reactors: Technical Overview and Measurement Procedures"
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in a distribution or transmission system is calculated to exceed the
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Current limiting reactors, once called current limiting
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Dann, Walter
Melville; Rudd, H. H. (June 17–18, 1915).
54:Westinghouse Electric & Manufacturing Company
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313:"Cos Phi Inc. - Line/Load Reactor Applications"
300:http://www.myronzucker.com/linereactorpg1.html
64:A current limiting reactor is used when the
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189:The Use of Current-Limiting Reactors
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123:Variable-frequency drives
22:current limiting reactors
339:"Line Reactors and VFDs"
83:Current limiting reactor
302:What is a Line Reactor?
367:Electrical engineering
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18:electrical engineering
239:. NWL. Archived from
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377:American inventions
70:interrupting rating
135:Electrical ballast
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72:of the associated
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321:. Retrieved
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276:17 September
274:. Retrieved
270:the original
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248:. Retrieved
241:the original
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199:18 September
197:. Retrieved
194:Toledo, Ohio
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114:line reactor
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108:Line reactor
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24:can reduce
361:Categories
343:ecmweb.com
323:2014-04-01
215:US 1467771
169:|url=
141:References
74:switchgear
60:Operation
49:reactance
160:cite web
129:See also
29:currents
43:History
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244:(PDF)
237:(PDF)
278:2012
252:2012
201:2012
173:help
98:coil
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