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Due to growing competition in the electricity market, the drive for efficient, stable and secure grid operation makes voltage control in the transmission grid relevant. A solution that has potential is to increase the effectiveness of the ancillary service by automatic fast control. The paper describes a Wide Area Voltage Regulation (V-WAR) that fits this framework. The V-WAR is based on Secondary...
Due to growing competition in the electricity market, the drive for efficient, stable and secure grid operation makes voltage control in the transmission grid relevant. A solution that has potential is to increase the effectiveness of the ancillary service by automatic fast control. The paper describes a Wide Area Voltage Regulation (V-WAR) that fits this framework. V-WAR is based on Secondary and...
The environment possesses the most threat to the overall performance of overhead lines as they are continuously exposed to its harsh influences, e.g. birds, lightning, pollution and fires. These environmental influences contribute about 95% to the total transmission network faults. The quality of supply to Eskom's customers is then heavily affected, and hence strategies of combating these environmental...
Continuous changes in the cost of suitable (conductive) material for bare overhead conductors, changes in electrical and mechanical requirements, and improvements in manufacturing technology, have resulted in the development of a variety of possible applications or options for overhead transmission lines. In the early days, simple copper wire or copper based bare conductors were used but nowadays,...
Conductors make up for about a third of the cost of an overhead transmission line. Power losses in lines account for the bulk of the transmission system losses, which in South Africa is about 1100 MW at peak load. These are critical economic factors which needs careful analysis when selecting a conductor for a new overhead line, which will be in operation for an excess of 25 years. Choosing a larger...
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