TECHNICAL MEETING PROCEEDINGS TEGNIESE VERGADERINGVERRIGTINGE

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1 THE ASSOCIATION OF MUNICIPAL ELECTRICITY UNDERTAKINGS OF SOUTH AFRICA DIE VERENIGING VAN MUNIS I PALE ELEKTRISITEITSONDERNEMINGS VAN SUID AFRIKA TECHNICAL MEETING PROCEEDINGS TEGNIESE VERGADERINGVERRIGTINGE,

2 V. ^ * If you have ever experienced the incon venience of unexpected peaks you will be looking for a gun. Peaks can be shot by disconnecting non-essential load during periods of exceptionally high network de mand. Effective selective load shedding at any time and in any part of your network can be achieved by means of: - Zellweger Ltd. Uster Factories for Apparatus and Machines CH-8610 Uster/Switzerland Sole S.A. representative: Farad Pty. Ltd. 5 Zambesi Road Emmarentia/Johannesburg ey

3 Vital anc ife-lines of power communication Paper and plastic insulated power and telecommunications cables. Bare copper strand. Aluminium wire and strand. Aberdare Cables Africa Ltd. Associated with: NKF GROEP N.V. HOLLAND Factory: Stanford Road, Port Elizabeth, P.O. Box 494, Tel Sales Office: Main Road, Eastleigh, Edenvale. P.O. Box 8514, Jhb. Tel AD MARK 6420

4 SIEMENS Siemens in die jare tig Die grafiek verteenwoordig die totale beleggings in miljoene rand deur Siemens in Suid-Afrika vir die tydperk 1967 tot Waar u ook al gaan in Suid-Afrika - of in Suidelike Afrika wat dit betref - is Siemens nooit ver weg nie. Die krag wat u gebruik, het bes moontlik deur Siemens-transformators of elektriese skakeltuig gegaan. Siemens het 'n aandeel gehad in die telefoonoproep of teleks wat u sitplek op die trein of vliegtuig bespreek het. En as die verkeer besonder vlot beweeg, het Siemens se gekoppelde rekenaar miskien ook daarin 'n rol vervul. In drie fabrieke en ses kantore oral in Suid-Afrika is byna 5000 Siemens-werknemers die meeste van hulle Suid-Afrikaners fluks aan die werk om Suid-Afrika te help uitbou. Hulle vervaardig klein transformators of telekommunikasiestelsels of groot en klein kragingenieurstoerusting en bied u diens in alle vertakkinge van die elektrotegniese ingenieurswese of u nou ook al 'n klein eenheid uit ons voorraad of 'n omvattende installasie of stelsel nodig het. Siemens (Suid-Afrika) het meer as R68 miljoen in Suid-Afrika bele. Waar kom al hierdie geld vandaan? Siemens se ontwikkeling in die verlede en in die toekoms is en word gerugsteun deur Suid-Afrikaanse aandeelhouers die Nywerheid-ontwikkelingskorporasie, Federale Volksbeleggings en die Ou Mutual, wat 'n aansienlike deel van die maatskappy se uitgereikte kapitaal besit. Vervul 'n hoofrol in Suid-Afrika S4368/a

5 METALCLAD SWITCHGEAR INCORPORATING INTEGRAL EARTHING Suitable for systems up to 13.8 kv 750 MVA Current ratings up to 2000 amps Now impulse withstand tested up to 95 kv. Models: VSI -with single busbar and VTD with double busbar. Air insulated, with extensive use of epoxy resin * Transfer Integral earthing * Attractive, flush-fronted appearance * Easy access for inspection and main tenance * Good cabling facilities * Fully interlocked * Readily extensible in all current ratings - no trunks or joggle chambers required to connect units of one current rating to those of another * Complies with all relevant British Standard Specifications. For further information contact HAWKER SIODELEY ELECTRIC A.T.W. (PTY) LTD. P.O. Box 417, Roodepoort, Transvaal. Phone

6

7 THE ASSOCIATION OF MUNICIPAL ELECTRICITY UNDERTAKINGS OF SOUTH AFRICA DIE VERENIGING VAN MUNISIPALE ELEKTRISITEITSONDERNEMINGS VAN SUID-AFRIKA EXECUTIVE COUNCIL UITVOERENDE RAAD STANDING COMMITEE/DAGBESTUUR J.C. Waddy E.de C. Pretorius J.K. von Ahlften D.C. Plowden Rdl. C. de Kock Clr. H. Lundie President (Pietermaritzburg) President Elect (Potchefstroom) Aangewese President Springs Johannesburg Potchefstroom Pietermaritzburg MEMBERS - LEDE R.W. Barton -Welkom P.J. Botes -Roodepoort E.E. de Villiers -Rustenburg H.C. Dreyer -Paarl D.H. Fraser -Durban K.G. Robson -East London Clr. M.L. Neppe -Johannesburg Clr. Dr. D. Frost -Welkom Clr. P.S. Stranack -Durban Rdl. H.J. Hugo -Roodepoort Clr. H.G. Kipling -East London Rdl. M.P. Kotze -Springs Rdl. Dr. S.'J.G. Hofmeyr -Paarl Rdl. J.F. van Zijl -Rustenburg CONTENTS INHOUD Programme7 Program 7 Welcome by Mayor 9 Verwelkoming deur Burgemeester 9 Member's Forum ;10 Ledeforum 10 New developments in the field of audio frequency signal transmission over power mains 32 Nuwe ontwikkelinge op die gebied van oudiofrekwensieseintransmissie deur die kragnet.'32 Committee Reports 49 and96 Komiteeverslae 49 en 96 Censitive Earth Fault Protection on.high Voltage overhead transmission lines. 74 Sensitiewe aardpunt beveiliging op bogrondse hoogspanning transmissielyne 74 Membership Roll 106 Ledelys 106 BRANCH CHAIRMEN/VOORSITTERS VAN TAKKE K.J. Murphy A.H.L. Fortmann W. Bozyczko" D. Haig-Smith -Good HopeyfGoeie Hoop Highveld/Hoeveld -Natal Eastern Cape/Oostelike Kaap SECRET ARIAT/SEKRETARIAAT Van der Walt &Kie/Co., Volkskasgebou 613, Volkskas Building Markstraat 76, Market Street JOHANNESBURG Phone Foon MNR. EUGENE DE C. PRETORIUS Aangewese President President Elect MR./MNR. JACK C. WADDY President

8 South Africa is a rich industrial country. ^s getting more powerful At every stage, you'll find TotaL Where it matters. TOTAL^ The fuel that powers and the oil that protects. TOTAL LfNTAS TL1O679/FP

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