Saturable Reactor Essay Example for Free

Saturable Reactor riseSaturable reactor or magnetised amplifier is a circuit that used to control very large rouse of AC with very small input DC. The saturable reactor consists of three essential elements Direct sure source, magnetic core with wind instruments, and alternating current source. How it work? The AC load circuit run on to magnetic core and the DC control circuit is also went on to the same core. Ac current flows by steer and Since this current is alternating, the coalesce set up in the magnetic circuit loop is invariably ever-changing in magnitude and direction. This means the field builds up to a uttermost in ane direction, collapses, and builds up to a maximum in the opposite direction DC circuit will reason mingle which is which is constant in magnitude and constant in direction. This means the field builds up and body steady state. The AC flux tends to saturate and then desaturate the core because of its cyclical operation. This results in a cha nging inductive reactance in the load winding.The DC flux, according to its strength, aids or opposes the AC flux in its saturate or desaturate effects in the core. Hence, the DC flux tends to control the AC flux controlling the reactance of the load winding. The use of separate windings on a single core has distinct advantages. consign winding consists of comparatively few turns of heavy wire because of large current requirements of different loads. Control winding Ni consists of many turns of fine wire. Since magnetomotive force depends upon the number of ampere turns, a small current in the control winding produces a magnetomotive force equal to that of the load winding. Usually, DC in the order of milliamperes controls AC in the order of amperes. The following describes the steps in the operation and control of the simple saturable reactor 1. nought DC control current in the control loop.Since only AC current is flowing by the load windings, an extremely advanced inductive reactance (Xl) is present in the load windings. This is overdue to the high trigger (L) of the load windings and the action of the varying magnetic field produced. Extremely high inductive reactance in this winding results in a high impedance (Z) which limits the flow of AC current to a low value. This high reactance also causes a large voltage drop across the load windings in series with the load, confine the current supplied to the load.Since current is limited to a low value to the load, minimum business office is transferred to the load since power is a function of current. 2. Increase DC control current in control loop. DC current creates a flux which, when superimposed on the AC flux, collectively saturates the core.Since the core is near saturation or fully saturated (core unable to hold any more flux lines), the inductive reactance is greatly reduced. This is due to the fact that no additional changing flux can be held by the core. With reduced inductive reactance the im pedance of the load windings is greatly reduced.Large AC currents are now permitted to flow through the load. This results in maximum power transfer to the load. Decrease DC control current in control loop. With less DC current flowing there is less total flux in the core and the core desaturates. This results in the cores ability to support once again the changing flux, creating a high inductive reactance, and resulting in change magnitude impedance in the load winding. Minimum power transfer results since current to the load is greatly reduced.