(19)

(11)

EP 0 243 412 A1

(12)

(43) Date of publication: 04.11.1987 Bulletin 1987/45 (21) Application number: 86906242.0 (22) Date of filing: 30.10.1986

(51) International Patent Classification (IPC):  H02H 3/ 30( . ) H02J 13/ 00( . ) H02H 7/ 26( . ) (86) International application number: PCT/AU1986/000326 (87) International publication number: WO 1987/002836 (07.05.1987 Gazette 1987/10)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 31.10.1985 AU 19850003188 (71) Applicant: THE SOUTH EAST QUEENSLAND ELECTRICITY BOARD Brisbane, QLD 4000 (AU)	(72) Inventors: COOMER, Ronald, James Bracken Ridge, QLD 4017 (AU) HOI, Ah, Loy Dorrington, QLD 4060 (AU) ROBINSON, John, Walton Ferny Grove, QLD 4055 (AU) (74) Representative: Kirk, Geoffrey Thomas, et al  BATCHELLOR, KIRK & CO. 2 Pear Tree Court Farringdon Road London EC1R 0DS London EC1R 0DS (GB)