User:Ajith vijayan004/Magnetically controlled reactor

A magnetically controlled reactor is a device in which a DC pulsating through a spe-cial winding controls the inductance and inductive susceptance. High saturation of the magnetic circuit steel with optimal magnetic and electrical circuit parameters ensures less than 2-3% main harmonic distortion even without special filters. Simple, trans-former-like construction ensures reliable operation. The price of magnetically con-trolled reactor depends on its response time. MCR was developed in Russia. MCR technology is particularly useful in systems characterized by long extra-high voltage (400-kV and above) AC lines. MCRs are a new type of saturable core reactor which has core magnetic field averaging about 10 times the strength of that used in earlier sys-tems. This greater core saturation makes it possible to decrease the reactor core mass and in the reactive power control system power rating.

MCRs increase power quality through automatic voltage regulation, reduced fluc-tuation, and smoothing of reactive power surges. Damping of voltage-oscillation in-creases power stability limits, permitting higher voltage transmission. MCRs support voltage levels at 1/3 the cost of series capacitive compensation. According to the change of transmitted power, MCR can automatically and smoothly adjust its capacity. Therefore, it can limit the over-voltage, improve reactive power compensation, and raise transmission quality in UHV transmitting lines. MCRs reduce  Idle Mode Power Losses.

Technically, economically, and in maintenance terms, MCRs compete most hand-somely against thyristor-controlled reactors (TCRs), and together with capacitor banks, against SVCs and synchronous condensers. The response of a thyristor-controlled reac-tor in voltage regulation to the voltage variations in a transmission line is faster than that of a magnetically controlled reactor. . In high voltage transmission lines, voltage variations are not sudden, so the slow response of the magnetically controlled reactor with respect to the thyristor-controlled reactor is not important. ajithvijayan004--Ajith vijayan004 (talk) 08:59, 5 July 2010 (UTC)