Craftsmanship and expertise
For more than 70 years ELEQ has been offering craftsmanship and expertise in electrotechnical applications. We do not only use this gathered knowledge to work continuously together with customers on new products, innovations and smart solutions, but also by participating in research.
Recently PAC World Magazine published a study where our engineer Douwe Baars contributed to together with ABB. The subject of this study is the influence of an external magnetic field on a ring-core Current Transformer which can, for example, be applied in power transformers or switchgear.
In short the study stated that under certain conditions an external magnetic field is able to saturate the core of a ring core current transformer locally. A significant peak current can be generated by the secondary winding at the instant of switching on an external magnetic field, e.g. due to the asymmetrical inrush current of a power transformer. This undesired peak current might trip the protection system. A winding for flux compensation can prevent this peak current almost completely.
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