In the electrical industry, the insulation layer of the field coil winding wire is of fundamental importance. As a result of the winding process, the insulation layer is subjected to great mechanical stresses, making a test of the finalized winding necessary.

With GNT plasma systems this insulation layer can be tested for faulty spots (pores). Due to the safe application of the GNT plasma devices, visual tests on already processed motor or transformer windings are possible without any problems.