Device for limiting short circuit current on the magnetic core of magnetic relutu00e1ncia variation without movable parts.

摘要

Device for limiting short circuit current with the core magnu00eatico variation magnetic relutu00e3ncia without movable parts being said device limiting short circuit current (or lack dlcf), a magnetic core (1) with a primary winding (2) through which flows the current pri Ncipal of electric circuit.With a entref error (3) on whose space includes the leg of a second magnetic circuit (4) of the same dimension of cross section and the same magnetic material.With a second winding (5) fed by a voltage of 220 V AC (11) of the ancillary service of a substation: the magnetic core (4) is kept saturated by the magnetic flux caused by the winding (5) and how it meets the entreferro (3), the magnetic flow generated by the roll (2) finds a high reluctance.Resulting in low inductance of the winding (2); the sensor TC (8), the controller (10) and the opening of the key Tyristor (6) when the signal reaches a certain level of growth rate, making the core ronto to drive the main magnetic flux, reflecting high in impedance in the en. The bearing (2) line.The variation of the voltage of the AC supply (11) results in changes in the impedance proportional to the supply voltage; the abolition of the TC elements (8), the controller (1 0) and key (6) makes the device completely liability if the magnetic fluxes of the windings (2) and (5) are with polarity op OSTA.With the subtraction of the magnetic flow and resulting in limitation of line current is always below the maximum value corresponding to the adjusted flow in the secondary roll (5).