STRESS CONTROL ASSEMBLY AND METHODS OF MAKING THE SAME

摘要

A stress control apparatus for managing effects caused by electrical stress in a high voltage environment, and methods of manufacturing the apparatus. A dielectric tube with a central bore coated with a conductive material has an outer conductive coating on a lower section that is grounded. The central bore carries a high voltage potential from a current-carrying conductor. The grounded coating transitions to the exposed outer dielectric surface along a gradually tapered transition. A conductive insert connects to the central bore and forms an electric field in a space between the insert and the grounded coating. When coated with an epoxy and inserted into the central bore, the insert forms a small gap between an outer surface of the insert and part of the central bore, such that there is no zero potential difference in the gap. Any epoxy that oozes out during insertion will collect in the gap.

主权项

1. A stress control apparatus, comprising:
a base assembly having an elongated dielectric member, a channel extending lengthwise through the dielectric member, an electrically conductive coating completely covering an inner surface of the channel and connected to a high voltage potential, the dielectric member having an upper portion that transitions to a lower portion at a transition area, wherein the lower portion has a smaller overall cross section than the upper portion at the transition area, and wherein the upper portion transitions to the lower portion in the transition area along a smooth taper devoid of sharp edges; a conductive grounded coating on the lower portion connected to a ground potential; and an electric field space formed in the lower portion adjacent to the channel and configured to receive therein a voltage sensor for sensing a voltage between the conductive coating and the conductive grounded coating.