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This paper reports the findings in a national survey conducted in 2008/2009 on the quality of supply. The respondents are from distribution system operators (DSOs) and from the Norwegian Transmission system operator (TSO). The survey was implemented as a web based survey and covered all quality of supply phenomena defined in EN 50160 [1]. In addition some EMC issues also were included. The objective of the survey was to investigate which phenomena are the most important and what the utilities’ needs to improve quality of supply management. The phenomena causing most problems in Norway are: 1. Supply voltage variations 2. Short duration supply interruptions 3. Voltage dips These phenomena are of highly ranked both by the Norwegian TSO and the DSOs responding to the survey. The most important need for quality of supply improvement according to the DSOs is to get advice concerning measurements and measurement equipment: The TSO sees basic technology transfer, national databases, advice concerning measurements/ measurement equipment and standardisation as important issues in general, but the needs are different for different phenomena.

Norwegian Quality of Supply Survey. State of Art and Reported Needs