Improvements in and relating to electric air-break power and isolating switches

摘要

528,395. Air-break switches. BRITISH THOMSON - HOUSTON CO., Ltd. May 5, 1939, No. 13475. Convention date, May 7, 1938. [Class 38 (v)] In an air-break switch of the power and isolating type and having each of a pair of cooperating contacts 3 carried by an individual supporting insulator 1, the mounting of the insulators and/or contacts being such as to enable the latter to execute relative swinging movements in a horizontal (as shown) or vertical plane or relative sliding movements, each insulator is mounted on a base member 5 consisting of a concrete, brickwork, or like non-metal structure formed in situ for maintaining the insulator in erect condition for switch-operation. The base members 5 are in the form of boxes containing parts 6 of the driving mechanism for rotating the insulator 1 in bearings 4, the members being set as deeply as necessary in the ground. In order to prevent relative movement between the members by subsidence, an interconnecting box-like wall 7, of the same material as the members, is provided, and houses a driving rod 8 and motor, to which access is had by inspection covers 9 on the side or top. To allow for inequalities in foundation-building, the contacts may be adjustable horizontally or vertically in the heads 2, or the latter may be adjustable in the insulators. The foundations of the phases of a polyphase switch may be linked up by walls similar, and at right-angles, to those 7, extending between members 5. Compressedair vessels for arc-quenching and operating mav be accommodated in the members 5 and walls 7 of power switches.