Improvements in means for regulating the voltage of asynchronous generators and in the excitation and control of synchronous generators

Abstract

Abstract 479,260. Automatic control systems and regulation; induction generators; inductances. BRITISH THOMSON-HOUSTON CO., Ltd. June 7, 1937, No. 15738. Convention date, June 6, 1936. [Classes 35, 38 (ii), and 38 (iv)] A capacity-excited induction generator has its terminal voltage stabilized by means of a saturable-core reactor connected in parallel, its impedance being high at the maximum voltage but being reduced by D.C. saturation to control the effective exciting current. The winding effecting saturation may be supplied from a source responsive to the generator voltage or current, or both. Parallel connected inductances magnetically biassed in opposite senses by the saturating current avoid asymmetry of the A.C. output. Fig. 3 shows an arrangement of windings LD on a single core and connected in parallel to the A.C. terminals of the machine M and at equipotential points to a saturating source G. A reactor may be saturated by a winding connected across the machine terminals in series with a rectifier which may be grid controlled or connected to the secondary winding of a transformer in series with the exciting capacity. Fig. 6 shows an alternator M excited by a coupled self-excited induction generator m through rectifiers GM. The A.C. output is regulated automatically as regards voltage by a saturating winding Ve, and as regards current by a second winding Vi, two grid-controlled rectifiers Gi, oppositely connected, determining the sense of the compounding.

Inventors

No inventors recorded.

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