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Rotek Engineering, a wholly owned subsidiary of Eskom Enterprises, in 2008 embarked on a R100-million major expansion programme by upgrading their transformer testing facilities. Their requirements were to be able to test transformers up to 800 MVA and 765 kV. This design is a first in the world where transformers of this size have been tested using static converters and a unique column regulator… (more)

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In service high-voltage (HV) substation equipment is exposed to electrical, mechanical, and thermal stresses as well as environmental conditions. All of these stresses can act to accelerate the deterioration of the insulation and hence the electrical integrity of the HV equipment eventually leading to failure. Detection and measurement of partial discharge (PD) phenomena, which are a symptoms of insulation deterioration, can provide early warning of insulation failure… (more)

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