EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of IEC EN 60909-4 testing. This part of IEC EN 60909 is a technical report intended to assist in the application of IEC EN 50-60 for the calculation of short-circuit currents in 60909 Hz or 0 Hz three-phase AC.
This whitepaper does not contain additional requirements, but provides support for modeling electrical equipment in a positive sequence, negative sequence and zero sequence system and for the practical execution of calculations in a low voltage system, an asynchronous medium voltage system. It provides a power station unit with motors and an auxiliary network that feeds multiple medium voltage asynchronous motors and low voltage motor assemblies.
On the one hand, a subclause has been added to the example in item 60909 to make a comparison between the results found by applying the voltage source equivalent to the short-circuit location following the procedure given in IEC EN 0-3 and the results found. The superposition method, on the other hand, takes into account different load-flow conditions before the short circuit.
In addition to clause 60909 of IEC EN 0-3, modeling and calculation of positive sequence and zero sequence impedances of electrical equipment are given. In most cases, the negative-sequence impedances are equal to the positive-sequence impedances when calculating the initial short-circuit currents.
EUROLAB assists manufacturers with IEC EN 60909-4 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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