Cast resin transformers

3 February 2010 Power Electronics / Power Management

Legrand has released new cast resin transformers manufactured by its subsidiary, EdM, for the distribution of electrical power, energy co-generation, rectification and traction.

EdM units meet stringent international quality and safety specifications for installation in any environment, including severe conditions. Standard distribution transformers have rated power between 100 and 3150 kVA, primary rated voltage up to 36 kV and secondary rated voltage up to 433 V. Special transformers have rated power up to 20 000 kVA and primary rated voltage up to 36 kV.

Unlike oil transformers, these cast resin units can be installed inside buildings and do not require additional building structures. Since no cooling fluids are necessary, maintenance costs are also minimised. Rubber inserts alleviate the transmission of vibrations between core and windings, also reducing operating noise levels and absorbing thermal expansion of components. Sockets on the MV side adapt the primary voltage to the mains, which can be set with the transformer switched off. Class F insulating material allows for a temperature rise of 100°C and the epoxy resin insulation means low maintenance. The carriage of these units, which allow safe movement, is pre-equipped for the mounting of IP reinforced enclosures.

Accessories include thermal sensors or thermistors, electronic units for temperature control and forced ventilation systems to increase transformer power in temporary overloads or at high environmental temperatures. Legrand can also supply MV terminations for plug-in connections, surge arrester kits and anti-vibrating supports. Protective enclosures, available with different degrees of protection – IP21, IP31 and IP23 – protect transformers from external environmental impacts and people from the risk of direct contact.

EdM transformers are enhanced by the Zucchini busbar trunking system which provides synergy for a direct connection. These busbars are available in aluminium or copper.

For more information contact Legrand, +27 (0)11 444 7971, [email protected], www.legrand.co.za

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