IEEE P3149

New IEEE Standard - Active - Draft.
The guide describes dissection techniques and methodologies for form wound stator coils and bars from rotating machines. The techniques are for use at any point in the life cycle of a coil or bar, as dissection can be done as part of a manufacturing process, after qualification test, after machine faults, and on coils and bars with no faults. The guide applies to any given construction, including Vacuum Pressure Impregnation (VPI), Resin Rich (RR), and Global Vacuum Pressure Impregnation (GVPI) and other systems. Due to the variety of construction, materials, and manufacturing processes, the guide does not provide acceptance criteria for measurable parameters.

This guide presents techniques and procedures that may be used for stator coil/bar dissection. It describes how dissections are performed in order to achieve the specific goals for which the dissection is made. The document reflects the dissection practices used in the industry and guides the reader to identify which technique to utilize for specific dissection goals.
The purpose of dissection is to assess the quality, homogeneity, and general condition of the insulation system. This can be done at various stages, such as manufacturing, after test failures, after winding failures, or on un-faulted bar/coil as part of a condition assessment effort.