Sparks Electrical News December 2017

DISTRIBUTION BOARDS, SWITCHES, SOCKETS AND PROTECTION

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WEG MPW ELECTRIC MOTOR PROTECTION RANGE IDEAL FOR HARSH ENVIRONMENTS

HIGH-QUALITY DBs FOR ALL TYPES OF INSTALLATION S

T he WEG MPW range of motor protection circuit breakers offers reliable operation in the harsh operat- ing environments found on the African continent. All motor protection circuit breakers in the range are manufactured in accordance with IEC 60947 and UL 508 international standards, giving operational parameters and quality assur- ance to the user. The devices offer the benefit of being compact and modular, facilitating space saving within the electrical panel itself. This means the panel can be small- er or, where necessary, more

MAJOR TECH offers high-quality flame-retardant DIN rail distribution boards which are available in two different designs: a robust IP 65 surface-mount for use outdoors or where strength is a pre-requirement; and an elegant IP 20 flush-mount and surface-mount for indoor use where aesthetics and ease of use are important. All distribution boards are supplied with a removable earth/neutral bar, an adjustable DIN rail to ensure straight installation and multiple knock-outs in different sizes located at the top, bottom, sides and back of the board to cater for all installation types. The IP 20 flush-mount offer is available with either a sturdy ABS tray or a galvanised steel tray. The galvanised steel offer is supplied with wire mesh spot welded to the back for increased fixing support.

cost saving. The magnetic-only version allows the use of electronic overload protection devices which further reduce costs. The WEG MPW motor protection circuit breaker is available with a full range of accessories including aux- iliary contacts, shunt trips, under voltage releases, door mounting handles and free-standing enclosures. The devices are certified to Type 2 allowing continuous op- eration until replaced.

components can be included in the panel. The WEG MPW range of motor protection circuit breakers is con- structed for optimal reliability. The WEG MPW range facilitates the protection of a wide range of electric motors from 0.16 A to 100 A. Significantly, the range has thermal magnetic versions facilitating protection against potential short circuit and overload conditions as well as magnetic-only versions which provide protection against short circuits. Use of the thermal magnetic device will reduce the number of components required when manufacturing a motor control centre. This can translate into significant

Enquiries +27 (0)11 872 5500

R70 MILLION SUPPLY OF MCC AND VSD

Enquiries: www.zestweg.com

LOW VOLTAGE SWITCHBOARDS recently supplied motor control centres and vari- able speed drives to the value of R70 million to the KCC mine based in the Demo-

TRAFO SUPPLIES DRY-TYPE TRANSFORMERS FOR WATER TREATMENT WORKS

cratic Republic of Congo (DRC). The project was managed by SENET which is renown for its engineer- ing excellence. Low Voltage Switchboards used the cubic system supplied by Sabelco which conforms to the latest IEC 61439 specifications. The motor control cen- tres were rated for 550 V, 3 200 A at 70 kVA. The project is one of the largest this year for Low Voltage Switchboards.

T he advantages offered by dry-type or cast resin transformers played a role in Trafo Power Solutions securing an order for thirteen custom designed units. These dry-type transformers are destined for installation in a large-scale Rand Water Zuikerbosch Water Treatment Works.

Enquiries: +27 (0)11 979 4100

David Claassen, managing director of Trafo Power Solutions, says it is most gratifying for the company to have received this order only months after the business was established. Claassen, an electrical engineer with broad-ranging and high-level experience in many sectors, recently estab- lished Trafo Power Solutions to distribute and service transformer products from Canada-based Hammond Power Solutions (HPS), in Africa. The contract to supply cast resin transformers for the waste treatment facility will include units that range from 100 kVA to 1 600 kVA. Included in the scope of supply is the complete earth fault protection system that will be in the transformer enclosures. Claassen says that projects go the route of cast resin or dry-type trans- formers for a number of reasons. “Prime among these, is the inherent safety offered by the units as well as ease of installation, given the fact that they are installed inside built substations as opposed to outdoors with as- sociated special bunding and civils.” Dry-type transformers are categorised as F1 in terms of international fire resistance ratings, making them low risk as they are self-extinguishing and flame-retardant by nature. With zero risk of fire, the high safety rating of dry-type transformers allows them to be installed indoors, avoiding the cost and inconvenience of the special structures normally required to ac- commodate the safety and environmental hazards related to oil-filled units. “And this results in savings because there is no need for costly civils and site work to be done,” adds Claassen. Less maintenance is another advantage. Dry-type transformers are low in maintenance and could last for 25 years without significant attention, while oil-filled transformers require regular maintenance, including oil sam- ple analysis to ensure operational consistency and safety.

Enquiries: +27 (0)11 325 4007

SPARKS ELECTRICAL NEWS

DECEMBER 2017