ITALY – R&S Group’s Tesar cast resin transformers passed the Climatic, Environmental and Fire Behaviour (C2 E2 F1) Test.

Located in Subbiano in the province of Arezzo, Italy, Tesar has been designing and manufacturing cast resin transformers for more than 40 years. In 2016, the company became part of R&S, a global provider of electrical infrastructure products.

Tesar achieved the Test Certificate for the Environmental, Climatic and Fire behaviour classes E4-C3-F1 as per IEC 60076-11:2018 on a cast resin transformer with rated power 1,000 kVA and rated voltages 20/0,4 kV BIL 125 kV in respect of the last ECO DESIGN Tier2 losses as per EU 548/2014 and EU 1783/2019, the manufacturer said in a press release.

The following tests were successfully carried out on the same transformer:

• Thermal shock test C3
• Condensation and humidity penetration test E4
• Fire behavior test and checking of gases emission F1

The tests were attended and certified by an independent third-party laboratory, CESI, in Milan.

The C3 test confirms that the transformer is suitable for transport and storage at temperatures down to -40°C, as well as energized and operated at -25°C (IEC 60076-11 Ed.2 2018-08 paragraph 12.1).

The E4 test verifies that the transformer is suitable for installation in harsh environments, such as areas close to industry where conductive dust and industrial smoke are abundant; areas close to the coast, exposed to salt spray or to strong and polluting winds from the sea; desert areas exposed to strong winds carrying sand and salt, and subjected to regular condensation (IEC 60076-11 Ed.2 2018-08 paragraph 12.2).

The F1 test confirms that the unit can be installed in places subject to a fire hazard (IEC 60076-11 Ed.2 2018-08 paragraph 12.3).

Fulfilling the requirements for the certification means that Tesar transformers are suitable for installation in harsh weather conditions. This is a step towards meeting the requirements of the customers more strictly due to the increase of special installations, Tesar said in a press release.

Source: Rauscher & Stoecklin