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Experience in using different diagnostics methods for field testing of medium-voltage cables with extruded insulation in Nuclear Power Plants

机译:在核电站中使用不同的诊断方法对具有挤压绝缘的中压电缆进行现场测试的经验

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Medium-voltage cables represent an important component of the Nuclear Power Plant (NPP) nuclear island as well as of its balance of plant. Therefore, it is reasonable to monitor their aging process and expected reliability. There are, however, many electrical, thermal, mechanical and radiation stresses, which, through time, can influence the occurrence of insulation degradation. Assessment and evaluation of the condition of cable insulation is supposed to be carried out periodically, during the scheduled outages and maintenance activities. Accordingly, it is necessary to carefully select the proper efficient diagnostic methods and different scrutinises, particularly studied and purposeful for determining the aging grade and overall adequacy of the cable insulation. To avoid unplanned failures with loss of critical equipment, the insulation must be properly tested. Therefore electrical and non-electrical diagnostic methods are used to ensure proper assessment of cable insulation deterioration. This paper reports on experience with application of different diagnostic methods boosting tendency to improve monitoring of the condition of the cable insulation in the NPP Krško, The diagnostic testing and measurements on cables recommended to be done in nuclear power plant respecting a good practice of asset maintenance management is discussed.
机译:中压电缆是核电厂(NPP)核岛及其电厂平衡的重要组成部分。因此,监视它们的老化过程和预期的可靠性是合理的。但是,存在许多电应力,热应力,机械应力和辐射应力,这些应力会随着时间的流逝而影响绝缘退化的发生。在计划的停运和维护活动期间,应定期进行电缆绝缘状况的评估和评估。因此,有必要仔细选择适当的有效诊断方法和不同的检查方法,特别是为了确定电缆绝缘层的老化等级和总体适用性而进行了专门研究。为避免因丢失关键设备而导致的计划外故障,必须对绝缘进行正确的测试。因此,使用电气和非电气诊断方法来确保正确评估电缆绝缘性能。本文报告了使用不同诊断方法的经验,这些趋势增强了改善对NPPKrško电缆绝缘状况的监控的趋势,建议在核电厂中对电缆进行诊断测试和测量,同时遵守资产维护的良好做法讨论管理。

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