Monitoring and analysis of blood pack faults has resulted in the identification and rectification of specific problems associated with blood pack manufacture and use. Close collaboration with manufacturers has enabled effective remedial action. Wider collation of data would provide an early warning of potential areas of concern.
Abstract--It is generally acknowledged that harmonic distortion levels on distribution networks are steadily increasing due to the proliferation of non-linear loads. While customer complaints relating to harmonic distortion levels are relatively uncommon, and measured levels are typically well within the limits specified by national regulations and international standards, the increasing trend may mean that more active management by utilities will soon be required.Effective management of harmonic distortion levels will require knowledge not only of the level of disturbance, but also of how the disturbance levels vary with time, location, and the connected load. Accepted methods for assessing harmonic levels that rely on cumulative probability statistics are inadequate for this level of insight. In this paper voltage total harmonic distortion levels (THD v ) from a distribution network power quality survey are analysed in terms of variation with time, system load and the physical characteristics of the monitored sites.Index Terms--harmonic distortion, power quality.
Abstract-Continuous power quality (PQ) surveys of electricity networks generate large amounts of data that must be condensed for the purpose of interpretation and reporting. In this paper, summary indices for continuous PQ disturbances are calculated from distribution network data, and the relationship between these indices and the known physical characteristics of the site is investigated.Results from this survey prompted further analysis into the relationship between voltage harmonic distortion (THD v ) levels and variation in load characteristics across the monitored sites. Accepted explanations for variation in THD v are evaluated against the observed levels and alternative explanations are proposed.
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