This invention relates to a self power-acquiring quickly responsive controllable reactor whose coil of the main body portion contains a control winding (6), a net-side winding (5), further contains a tertiary winding (7). The tertiary winding (7), the control winding (6) and the net-side winding (5) are set in turn on a magnetic conductive core column of the main body portion (1) from inside to outside; the net-side winding (5) has power-acquiring taps; which connect with the primary coil of rectiformer in a rectifying-filtering unit (2). The output terminals of the rectifying-filtering unit (2) connect with the control winding (6). A quick switch (K) is in parallel connected with the tertiary winding (7). The on/off state of the quick switch (K) is controlled by the command transmitted by the control unit (4) in the controllable reactor. This invention uses an additional tertiary winding to control the power system through the high speed switch and the control unit in the case of short circuit to meet the quick response when the controllable reactor is in fault. Moreover, this controllable reactor has an excellent obtaining effect and wide applications.
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