EUROLAB, with its state-of-the-art accredited laboratories and expert team, offers precise and rapid testing services within the scope of IEC EN 60071-1 test. IEC EN 60071-1 applies to three-phase AC systems with the highest voltage for equipment above 1 kV.
It covers the procedure for the selection of declared withstand voltages for phase-to-earth, phase-to-phase and longitudinal isolation of equipment and the installation of these systems. It also gives a list of standard withstand voltages from which nominal withstand voltages should be selected.
This standard recommends that the selected withstand voltages be related to the highest voltage for the equipment. This association is for insulation coordination purposes only. Requirements for human safety are not covered by this standard. Although the principles of this standard also apply to transmission line insulation, the values of the withstand voltages may differ from the standard rated withstand voltages. Device committees are responsible for determining the declared withstand voltages and test procedures appropriate to the equipment concerned, taking into account the recommendations of this standard.
Determination of coordination withstand voltages consists of determining the lowest values of the withstand voltages of the insulation that meet the performance criterion when exposed to representative overvoltages under service conditions.
The coordination withstand voltages of the insulation are the representative overvoltages of the relevant class and their values are obtained by multiplying the values of the representative overvoltages by a coordination factor. The value of the coordination factor depends on the accuracy of the evaluation of representative overvoltages and on the empirical or statistical evaluation of the distribution of overvoltages and insulation properties.
Coordination withstand stresses can be determined as conventional assumed withstand stresses or as statistical withstand stresses. This affects the determination procedure and the values of the coordination factor.
EUROLAB assists manufacturers with IEC EN 60071-1 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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