Abstract
There is increasing demand for more and more energy efficient magnetic cores to be used in modern electrical devices like inverters or smart grid instrumentation (high and medium voltage instrument transformers). The most important magnetic parameters are as high as possible magnetization characteristics (B m = f(H m ) curve) associated with lowest specific total core losses. As magnetic properties of magnetic cores become worse during production processes it is extremely important to test them in order to improve the production process. In the case of large magnetic cores they cannot be tested in generally used computer systems. Therefore, there is a need for quality testing system for cores of large mass, in the order of several hundred kilogramms.The paper presents an example of an application for testing the system based on Labview platform for quality checking of large magnetic cores in the order of 1000 kg. Example of testing data for one and three phase core are presented.
Highlights
There is increasing demand for more and more energy efficient magnetic cores to be used in modern electrical devices like inverters or smart grid instrumentation
In a case of relatively large masses in the order of dozens and more kilograms commercially available computer test systems are not usually used. This is due to the need to provide high-power necessary to magnetization if the core which has big amount of a ferromagnetic material
Three cores for test were chosen: two stacked one phase, welded and bolted cores made of non-oriented electrical steel tape of grade M400-50A one of 28 kg in mass (Fig. 5 a) and one of 220 kg (Fig. 5 b)
Summary
There is increasing demand for more and more energy efficient magnetic cores to be used in modern electrical devices like inverters or smart grid instrumentation (high and medium voltage instrument transformers). In a case of relatively large masses in the order of dozens and more kilograms commercially available computer test systems are not usually used. This is due to the need to provide high-power necessary to magnetization if the core which has big amount of a ferromagnetic material. Production of cores from electrical steel tapes requires the use of such technological processes as, for example: cutting, packaging of, squeezing, twisting or welding. These processes, as well as undesirable air gaps cause further deterioration in the properties of the final product. The system allows for precise and first of all repeatable determination of magnetic properties of tested magnetic cores
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