EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of IEC EN 61558-2-17 testing. This part 61558 of IEC EN 2 applies to relevant power transformers for single-phase or multi-phase, air-cooled, switched-mode power supplies:
A rated frequency of 500 Hz to 1 MHz, the rated output does not exceed:
Transformers for switched-mode power supplies must comply with the relevant part of IEC EN 61558-2 and the conditions for use in the apparatus or equipment must comply with their marking. However, if they are used in apparatus or equipment for which there is a corresponding apparatus or equipment standard, they may be tested under conditions existing in the apparatus or equipment for which they are designed.
Accordingly, a switched-mode power supply transformer tested under the conditions found in the apparatus or equipment for which it is designed shall comply with the following clauses and paragraphs or parts thereof; all other clauses, paragraphs, or parts thereof are deemed to be covered by the corresponding provision.
For no-load secondary voltages greater than 35 V peak alternating current or 60 V direct current, the poles remain inaccessible, providing access to live parts that are normally connected to a secondary circuit.
For transformers with cut-off frequencies not greater than 40 kHz, an additional thermocouple or equivalent temperature measurement method must be used to determine the temperature of the insulating material between the windings. In particular, the temperature of the insulating material between the primary and secondary must be measured to ensure that the maximum temperature of the classified material is not exceeded due to the shape of the voltage waves containing high cut-off frequencies and even higher frequency harmonics.
This can be done by preparing a special sample with a thermocouple or equivalent placed at the location of the hottest spot, in agreement with the manufacturer, so that the normal operation of the unit is affected as little as possible.
EUROLAB assists manufacturers with IEC EN 61558-2-17 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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