Zucchini MV Transformers

A range of high efficiency transformers.

The Legrand Green T.HE transformers fully comply with the new eco-compatible design rules and guarantee a significant reduction in energy consumption, thus promoting significant economic savings and the reduction of CO2 emissions into the atmosphere.

Partial discharges are microscopic phenomena occurring inside insulating resin cavities and are a factor in the speeding up of the ageing process of a transformer. Therefore, it is important that the values of such currents are limited. According to the product standard regarding the design of resin transformers (IEC 60076-11), all windings with a voltage of ≥ 3.6 kV are subject to the measure of partial discharges and the value measured should not exceed 10 pC (picocoulomb). When the Green T.HE transformers were subjected to the measurement of partial discharges, the values detected were always below 5 pC, significantly better than required by the standard.

A low value of partial discharges represents the index of some positive factors, such as:

• proper and solid design criteria.
• quality raw materials.
• precision during conductor foil winding phases.
• competence during the epoxy resin pouring around the high-voltage winding.
• accuracy in final assembling of the complete assembly.

It is clearly evident that a lower level of partial discharge leads to a higher resistance to work stresses and consequently to a higher life expectancy of the transformer under examination.

Features and benefits:

• Confirming to IEC 60076-11 and EU regulation 548/2014.
• HV (high voltage) and LV (low voltage) terminals have been modified and built to facilitate the connection of the product on both windings.
• The HV windings are all made in BIL LIST 2, thanks to the reinforced insulation in the critical points of the unit.
• They guarantee very high performance and reduced losses compared to previous models, while maintaining equivalent weights and dimensions. All this is possible thanks to the completely new magnetic core with newly developed and high-performance material.
• New magnetic core.
• Reinforced insulation.
• Higher performance with low weights and dimensions.