Design and Issues Associated with the HDM Electrical Insulation System

Abstract

The Westinghouse Electric Corporation (WEC) is under contract to design and build the High Energy Booster dipole magnets (HDM’s) for the SSCL through low rate initial production (LRIP). The first phase of the HDM program is the fabrication and test of short 1.8 m HDM model magnets designed by the SSCL. This technology transfer phase is well underway with the delivery of the first WMSD built HDM model magnet, DSB701 to the SSCL and the completion of the test program conducted at the SSCL Superconducting Cable and Magnet Test Laboratory (SMCTL) in April of this year. This paper presents a summary of reverse engineering analyses of the HDM model magnet electrical insulation system performed by the WEC. The electrical stresses in the 2-D magnet cross section are estimated under rated voltage conditions for Hipot tests in air. A transient voltage analysis is presented for the ringer circuit Results of an analysis of quench voltage behavior as a function of protection circuit parameters is also presented. The lumped quench circuit model predicts the terminal and splice voltages, coil resistance, hot spot temperature, and MIITS. Deficiencies in the electrical insulation HDM model magnet design are addressed.