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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This paper gives an overview of the ongoing activities in CIGRE WG36-07: "Power quality indices and objectives". It introduces the considerations supporting the need for power quality indices and objectives in the present context of deregulation of the electricity industry. Experts generally agree on the need for standardized quality indices allowing to monitor and to report power quality in a common format. However, concerning quality objectives the need is more likely for different levels of quality that can match customers expectations and the price they are willing to pay for electricity. Some practical limitations to voltage quality monitoring are also discussed. The status of the work within the working group is described for harmonics, flicker, unbalance and voltage dips.

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