PLANT FOR ARAPUNI

Evening Post, Volume CXXI, Issue 107, 7 May 1936, Page 8

PLANT FOR ARAPUNI

WATER-WHEEL ALTERNATORS

MANUFACTURE IN BRITAIN

(From "The Post's" Representative.) LONDON, April 4.

1 The "Electrical Keview" gives some facts regarding the two vertical waterwheel alternators which are being manufactured by the ' MetropolitanVickers Electrical Company for the Arapuni power station.

The alternators are rated at 24,000 kva, 11,000 v., 3-pliase, 50-cycles, 214 r.p.m. and are believed to be among the largest-sized electrical machines of which construction has yet been undertaken by British manufacturers. The yoke is just over 26ft,in diameter and weighs nearly 18 tons. It is of welded steel construction and is made in four sections, with special arrangements to ensure that the sections, when assembled, will always fit into correct circular form without necessity for packing or special fitting. The core is also assembled in four sections so that the stator, when completed, can be divided for shipping, the coils spanning^ the joints being, of course, removed for this purpose. The punchings are assembled in the yoke on dove-tailed axial ribs welded to the frame, the exact location of the ribs being ensured by the use of jigs. The 11,000-v. stator winding is of the diamond coil type in open slots,'facilitating removal of the coils. The total weight of copper in the stator winding of each machine is nearly five tons.

The initial equipment of the Arapuni power station, was supplied by Messrs. Armstrong Whitworth and Co. The two new sets will consist of the Metro-politan-Vickers alternators and Francis type water turbines which are being supplied by Messrs. Bovings, Limited.