Green T.HE CAST RESIN TRANSFORMERS
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Green T.HE CAST RESIN TRANSFORMERS THE GLOBAL SPECIALIST IN ELECTRICAL AND DIGITAL BUILDING INFRASTRUCTURES

Contents 4-9 General features Green T.HE cast resin transformers Advantages of Green T.HE transformers Product News Certified quality Cast resin HV/LV Green T.HE Insulation class 12 kV Insulation class 17.5 kV Insulation class 24 kV Insulation class 36 kV Installation accessories

Cast resin transformers G REEN T.HE From 2021, the new European Commission Ecodesign Directive comes into force imposing stricter efficiency standards. From July 2021 (tier 2), regulation 548/2014 (updated by Regulation 2019/1783) requires manufacturers to produce transformers with no-load loss reduced by 10% compared with the previous requirement. 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...

ECODESIGN REQUIREMENTS CLASSIFICATION The classification of a cast resin transformer depends on the value of the no-load loss (P0), as well as the load loss (Pk). More precisely, P0 losses are independent from the loads and remain constant for the whole time the transformer is connected to the electrical grid. On the other hand, Pk losses only occur when the transformer is feeding a load and they are proportional to the square of the load. TIER 2 (from 1st July 2021) Maximum no-load loss P0 [W] Maximum load loss Pk [W] Requirements applicable (losses values) to medium power three-phase...

TRANSFORMERS Low partial discharges, HIGH quality Partial discharges are microscopic phenomena occurring inside insulating resin cavities 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...

Extreme environmental conditions The IEC 60076-11 standard identifies the environmental, climatic and fire behaviour classes of dry-type transformers with an alphanumeric code. Thanks to the use of high-quality epoxy resins, all Legrand transformers minimize environmental impact and comply with the following classes: • Environmental class E3 • Climate class C2 • Fire behaviour class F1 This means that they can be stored, transported and above all used under extreme environmental conditions: - Minimum room temperature: -25 °C - Maximum relative humidity: 95% Furthermore, in standard...

With the new Green T.HE series (tier 2), Legrand offers its customers a very high-quality product, with excellent performance and reduced losses, in full compliance with regulation 548/2014 and subsequent updates (EU regulation 2019/1783). Thanks to the use of innovative materials and the measures taken during their design, the new transformers are characterised by the following distinctive features: • HV (high voltage) and LV (low voltage) terminals have been modified and built to facilitate the connection of the product on both windings. Updated HV terminals Updated LV terminals The HV...

Certifications The Legrand test lab “IB03” has recently received the qualification by ACAE to work in accordance to IEC EN 17025 standard on all routine tests and on some tests for mediumvoltage transformers. Such acknowledgement and qualification is a very important milestone obtained and Legrand, with a limited number of companies around the world, can offer this to their customers. All Legrand transformers are individually tested before being delivered to the customer. Thanks to the excellent quality of its transformers, Legrand offers to its customers the possibility of extending, upon...

CAST RESIN HV/LV Green T.HE Compliance with the standards: IEC 60076-11 and EN 50708 Power: 100–3150 kVA Frequency: 50 Hz Tapping links, HV side: ± 2 x 2.5% Vector group: Dyn11 Thermal class of the insulation system: 155 °C (F) / 155 °C (F) Temperature rise: 100 K / 100 K Environmental Class: E3-C2-F1 Primary Voltages: from 6 to 11 kV. Insulation class: 12 kV BIL 75 kV Secondary Voltages no-load: from 400 to 433 V (insulation class ≤ 1,1 kV)) Primary Voltages: from 12 to 15.75 kV. Insulation class: 17.5 kV BIL 95 kV Secondary Voltages no-load: from 400 to 420 V (insulation class ≤ 1,1 kV))...

Secondary Uk no-load [%] voltage [V] Wheel Wheel centre line diameter (E) [mm] (D) [mm] Enclosure* type This table shows the characteristics and codes of transformers with 10/0.4 kV ratio and Dyn11 vector group. The losses information is also valid for various transformer ratios and vector groups. Secondary Uk no-load [%] voltage [V] Wheel Wheel centre line diameter (E) [mm] (D) [mm] Enclosure* type This table shows the characteristics and codes of transformers with 15/0.4 kV ratio and Dyn11 vector group. The losses information is also valid for various transformer ratios and vector groups....

Secondary Uk no-load [%] voltage [V] Wheel Wheel centre line diameter (E) [mm] (D) [mm] Enclosure* type This table shows the characteristics and codes of transformers with 20/0.4 kV ratio and Dyn11 vector group. The losses information is also valid for various transformer ratios and vector groups. Secondary Uk no-load [%] voltage [V] Wheel Wheel centre line diameter (E) [mm] (D) [mm] Enclosure* type This table shows the characteristics and codes of transformers with 33/0.4 kV ratio and Dyn11 vector group. The losses information is also valid for various transformer ratios and vector groups....

GREEN T.HE - Cast resin transformers Installation accessories TEMPERATURE MEASUREMENT PROBES The probes are supplied mounted on the transformer and wired to a robust IP66 die-cast aluminium junction box. Type on the LV windings (3) on the LV windings (3) on the LV windings (3) + on the core (1) on the LV windings (3) + on the core (1) on the LV windings (3 pairs) for alarm and trip. on the LV windings (3 pairs) for alarm and trip. on the LV windings (3 pairs) for fan control, for alarm and trip. CONTROL UNITS The control units are supplied loose Type temperature control for 3 or 4 Pt100...