Comparison Between Artificial and in-Service Impulse Electrical Stress for Insulation Degradation Tests

Paper i proceeding, 2025

The challenge to design and properly evaluate future insulation systems increases constantly, as a part of processes aiming to monitor manufacturing quality. One of such approaches is here illustrated when evaluating the performance of an ignition coil exposed to a thermal stress that may introduce cracks in its epoxy-based insulation. By monitoring PD activity, there exists a possibility to clearly detect changes in the coil performance. The measurements of PDPR patterns can be obtained from relatively simple test objects and utilizing an artificially created controllable waveform. These are here compared with on-line measurements performed on complex fullscale coils and indicate that both the approaches are useful to provide a more versatile approach in test object diagnostics.