EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of IEC EN 62271-2 testing. It applies to all switchgear and their assemblies for alternating current with rated voltages of 72,5 kV and above for internal and external installation, including supporting structures rigidly connected to the ground.
When switching devices and their assemblies are not floor-mounted, for example in a building, the terms of application are subject to agreement between users and manufacturers. The seismic adequacy of switchgear and assemblies takes into account any auxiliary and control equipment, either directly mounted or as a separate structure. This standard specifies procedures for seismic characterization of ground-mounted switchgear and their assemblies with rated voltages of 72,5 kV and above. The seismic qualification of switchgear and assemblies is made on request only.
This standard specifies seismic severity levels and provides a selection of methods that can be applied to demonstrate the performance of high voltage switchgear and their assemblies where seismic characterization is required.
Seismic proficiency should demonstrate the ability of switchgear and assemblies to withstand seismic stress. The main circuits, including the associated mounting structures, must not fail in the control and auxiliary circuit.
Analytical methods, experimental methods, or a combination of both will be used to perform the seismic qualification. If analytical methods are used, sufficient data is required; if not, a sample test rig, representative of the system in structure and function, should be tested. These baseline experimental data will be used as input for calibration in analytical methods.
For practical reasons with existing experimental facilities, the seismic nature of switchgear and assemblies may require the identification and selection of different subsets that meaningfully represent the entire system for structural and functional checks.
Based on the technical knowledge of the design features of the substation, a three-dimensional model of the test set should be created. Such a model should take into account the existence of real compartments and their supporting structures and have sufficient sensitivity to explain the dynamic behavior of the test set in the frequency range under consideration.
In general, electrical and environmental service loads cannot be simulated during seismic testing. This also applies to the internal pressure of the test set due to the test laboratory's safety requirements. The test set will not be run during seismic tests; The control and auxiliary circuits must be energized to monitor any flickering of the relays, but they do not need to cause the switching devices to operate.
EUROLAB assists manufacturers with IEC EN 62271-2 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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