Composite Insulator for Disconnectors
ACTOM High Voltage Equipment has developed a 132 kV/550 BIL/31 mm/kV composite post insulator with a porcelain core for use on their disconnectors and other support functions.
The new insulator, introduced into the market recently, is ACTOM High Voltage Equipment’s first ACTOM branded insulator product. “It has been designed by us and is manufactured by an approved overseas manufacturer to our specifications in accordance with international quality standards,” said Jan Venter, the division’s Supervisor, Insulators.
Hard on the heels of the division’s completion of development of the new product in mid-2013, Namibia’s power utility NamPower awarded it a R20-million contract in September to manufacture and supply 28 x 132 kV and 45 x 245 kV disconnectors. A total of 288 of the new composite post insulators were used on the 132 kV units. Alstom, ACTOM’s technology partner, supplied the 245 kV units equipped with composite insulators.
The disconnectors, delivered on schedule in April this year, are earmarked for installation at NamPower’s Lithops and Khan transmission substations in the Namib Desert. Khan is an existing 220 kV switching substation that is being extended with the addition of a new bay, while Lithops is a new 220 kV/132 kV substation that is being built.
“This particular product is unusual among composite insulators as it consists of a porcelain core coated with silicon. The porcelain-based insulator has the rigidity that our disconnectors require,” said Venter:
He explained that other categories of high voltage equipment are adequately served by composite insulators with glass cores, but for the ACTOM disconnector design, glass core insulators are unsuitable because they increase the risk of deflection under load, among other problems.
ACTOM High Voltage Equipment is the first local manufacturer to develop and produce a composite insulator with a porcelain core. Prior to introducing the new product the disconnectors it supplied into the local market were fitted with traditional all-porcelain insulators.
“The porcelain-based composite insulators have the advantages of being lighter than the traditional product, as well as performing more efficiently in polluted environments,” Venter concluded.
ACTOM (Pty) Ltd is the largest manufacturer, solution provider, repairer and distributor of electro-mechanical equipment in Africa, offering a winning and balanced combination of manufacturing, service, repairs, projects and distribution through its 41 distribution outlets throughout Southern Africa.
ACTOM is also a major local supplier of electrical equipment, services and balance of plant to the renewable energy projects.
It also holds numerous technology, distribution and value added reseller agreements with various partners, both locally and internationally.
For further information contact Terry Lawrenson, ACTOM High Voltage Equipment
PO Box 13793, Witfield 1467
Tel (011) 820-5369 Fax (011) 823-9047
Press release compiled by Julian Kraft, J Kraft Public Relations
PO Box 2826 Wilropark 1731
Tel (011) 472-6686 Fax (011) 086-613-9657
Date: July 28, 2014
Caption: Jan Venter (left), ACTOM High Voltage Equipment’s Supervisor, Insulators, and Craig Aaron, Senior Product Manager, Isolators, with some of the newly-developed ACTOM-branded composite insulators for disconnectors.