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Publication of GB374861ApublicationCriticalpatent/GB374861A/en
374,861. Impedance networks. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London, and COE, R. T., Brandreth, Dunchurch Road, Rugby. Jan. 10, 1931, No. 912. Drawings to Specification. [Class 40 (iii).] Undesired harmonics are filtered out of a three-phase supply by means of acceptor circuits arranged in star or delta connection. These are coupled to the mains through transformer windings, the transformer leakage reactances serving as the tuning inductances for the acceptor circuits. The connections to the transformer may be variable tappings. The voltage may be stepped down to a value suitable to the condensers.