Current limiting reactor
In
History
Current limiting reactors, once called current limiting reactance coils, were first presented in 1915.[2] 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
Operation
A current limiting reactor is used when the
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 large motor.[5]
Construction
It is desirable that the reactor does not go into magnetic saturation during a short circuit, so generally an air-core coil is used. At low and medium voltages, air-insulated coils are practical; for high transmission voltages, the coils may be immersed in transformer oil. 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.[6]
Line reactor
A line reactor 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 [7] and may also reduce injection of harmonic currents into the power supply. The most common type is designed for three-phase electric power, in which three isolated inductors are each wired in series with one of the three line phases.[8] Line reactors are generally installed in motor driven equipment to limit starting current, and may be used to protect Variable-frequency drives and motors.:[9])
See also
References
- ^ Simpson, James. "The how and why of current-limiting reactors". EC&M Electrical Construction & Maintenance.
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(help) - ^ Dann, Walter Melville; Rudd, H. H. (June 17–18, 1915). The Use of Current-Limiting Reactors. Meeting of the Society of Mechanical, Electrical, and Steam Engineers. Boody House, Toledo, Ohio. Retrieved 18 September 2012.
- ^ US 1467771, Alden, Vern, "Current Limiting Reactance Coil", issued September 11, 1923, assigned to Westinghouse Electric and Manufacturing Company
- ^ "Current Limiting Reactors: Technical Overview and Measurement Procedures" (PDF). NWL. Archived from the original (PDF) on 3 March 2014. Retrieved 17 September 2012.
- ^ "Quality Power". Archived from the original on 10 March 2019. Retrieved 17 September 2012.
- ^ "Electrical Transmission and Distribution Reference Book", Westinghouse Electr Corporation, Pittsburgh PA, 1950 pp. 133-135
- ^ http://www.myronzucker.com/linereactorpg1.html What is a Line Reactor?
- ^ "Cos Phi Inc. - Line/Load Reactor Applications". Archived from the original on 2012-12-28. Retrieved 2014-04-01. Line reactor configurations
- ^ "Line Reactors and VFDs". ecmweb.com. Archived from the original on 2004-10-20.