Electromagnetic compatibility (EMC) is often associated only with radio interference. But another significant component of EMC is generation of harmonic components of electric current and voltage by a device that has an impact on a mains circuit and that could be a reason for considerable losses of supplied energy. The acceptance limits of generated interruptions are specified in both Polish and European standards which, as a result of a quick development of electrical appliances, are frequently updated.This paper presents comparative test results of interruptions generated by selected welding instruments ranging from transformer inverters for both hobby and workshop purposes, up to professional industrial devices.
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