| 摘要 |
The device is applicable in the electrical supply of systems having responsible functions in the power industry, railway transport, air transport, etc. It has simple structure and higher reliability as no electromechanical switchgear and automated system for their control is needed. The device consists of AC supply feeders (1, 2,...n), the phases of the same pole of the latter being connected respectively to one of the AC inputs of single-phase two half-period rectifiers (1', 2'..n), and the other AC input of every one of the rectifiers being connected to neuter of the supply feeders. The DC outputs of the same pole of the rectifiers are interconnected, and their positive outputs - to the middle point of the primary side of a supply mains tansformer. The end of one of the primary windings (3), across a thyristor (5) and the beginning of the other primary winding (4) across a thyristor (6) are connected to the negative outputs of the rectifiers, and the secondary winding (7) of the supply mains transformer (2) is connected to AC load (8). The phases of the same pole of the supply feeders are connected, respectively, to the anodes of a group of diodes (9.1, 9.2,....9n) and the cathodes of another group of diodes (10.1, 10.2,...10.n). The cathodes of the first group of diodes are connected by a limiting resistor (11) to the control electrode of thyristor (5), and the anodes of the second group of diodes, by an inverting transformer (12) and limiting resistor (13) are connected to the control electrode of a second thyristor (6).
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