Inhoudsopgawe
Hoofstuk 1: Beroepsgesondheid en -veiligheid Gevaarlike praktyke .......................................................................................................... 2 Risiko-ontleding ................................................................................................................ 3 Menseregte in die werkplek ............................................................................................. 4 Werketiek ............................................................................................................................ 5 Mediese noodgevalle ......................................................................................................... 6
Hoofstuk 2: Drie-fase WS-Opwekking Voordele en nadele van enkel-fase in vergelyking met drie-fase-stelsels .................12 Enkelfaseopwekking ........................................................................................................15 Drie-faseopwekking ........................................................................................................16 Drie-fasestelsels; ster vs. delta (delta vs. ster) ..............................................................18 Drywing in drie-fase-stelsels en berekenings ..............................................................22 Verliese ..............................................................................................................................26 Konsep van arbeidsfaktorverbetering ...........................................................................27 kWh-meter .......................................................................................................................30 Meting van drywing in Drie-fase-stelsels.....................................................................35
Hoofstuk 3: Drie-fase transformators Drie-fase transformators ................................................................................................42 Hoe om ’n drie-fase transformator in ster of delta te verbind ...................................45 Tipes drie-fase transformators .......................................................................................46 Transformators (ster/ster, delta/delta, ster/delta, delta/ster) .....................................51 Berekenings: (Rendement 100%) ..................................................................................54 Toepassing van transformators ......................................................................................57 Veiligheid en transformators .........................................................................................58
Hoofstuk 4: Drie-fase motors en aansitters Werkingsbeginsel van die driefase-kourotor induksiemotor ....................................66 Verbindings van die motor in begin of delta ...............................................................71 Berekenings van sinchrone spoed, glip, drywing en rendement ..............................72 Elektriese en meganiese inspeksies/foutsporing .........................................................75 Direk-aan-lyn-aansitter met oorbelasting ....................................................................81 Vorentoe-agtertoe-aansitter met oorbelasting ...........................................................86 Outomatiese Ster-Delta-aansitter met oorbelasting ..................................................89 Agtereenvogende aansitter met oorbelasting (sonder tydreëlaar) ............................92 Agtereenvolgendemotor-aansitter met oorbelasting (met tydreëlaar) .....................94
Hoofstuk 5: RCL-stroombane Induktiewe reaktansie ....................................................................................................106 Drywing ...........................................................................................................................108 Hoe om sin te maak van serie- en parallelstroombane .............................................111 Berekenings vir serie-RCL-stroombane ......................................................................115 Parallel-RCL-stroombane ..............................................................................................118 Berekenings vir parallelstroombane ............................................................................124
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