Iscor's experience with On - Line PD Testing on 3.3kV Motors

摘要

It is widely recognised that partial discharge is present and measurable in machines with an operating voltage exceeding 6.6 kV. However, at lower voltages, especially on 3.3 kV machines the effect of PD, if any is unknown. Using existing PD monitoring equipment (such as epoxy-mica capacitors and the TGA test instrument) an attempt was made to monitor the effect of PD on 3.3 kV insulation systems. This was done in order to determine PD levels, as well as failure mechanisms and eventually obtain sufficient data to establish acceptance standards for machines operating at these voltages.