The high voltage threat

摘要

HV equipment with questionable insulation may be a threat to operating personnel, nearby equipment and the power system network itself. While it's true that a simple error of judgment or the misunderstanding of some subtle power issue can sometimes lead to a dangerous situation, it is not the well trained, experienced and cautious engineers that generally present a hazard in this area. It is more often than not (and perhaps surprisingly) an aspect of the equipment itself: insulation. The reliable operation of any high voltage equipment depends critically on the integrity of its insulation. This equipment during service, is always under the influence of electrical, mechanical, thermal and environmental stresses, which cause the slow degradation of insulation quality.