An extensive Insulation coordination study has been conducted for the 500-kV d.c. cables that will be installed in a tunnel under the St.-Lawrence river. These cables wUI be part of the Radisson-Nicdet section of the Quebec-New England HVDC line. This paper provides an overview of the studies and the phenomena that wUI cause decisive overvoltage stresses on the cable insulation. The basic assumptions and the simulations of these phenomena with the DCG/EPRI-released Electromagnetic Transients Program (EMTP) are also discussed. Finally, the results of the overvoltage studies and the specified insulation levels for the d.c. cables are presented.

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