改进的灰靶理论在固体环网柜绝缘状态评估中应用的研究

Application of Improved Gray Target Theory Based Assessment on Insulation State of Solid-Insulated Ring Main Unit

针对固体环网柜绝缘状态评估的问题,提出一种在没有标准故障模型情况下对固体环网柜绝缘进行状态评估分级的新方法。通过对传统灰靶计算方法进行改进,得到改进加权灰靶靶心度计算方法,针对各项指标权重问题,采用层次?熵权组合权重法计算各项指标的影响权重,解决了各项绝缘参数指标对于绝缘评估结果影响不同的问题。并针对固体环网柜自身的特点,给出了固体环网柜的绝缘状态分级策略,最后通过实验验证了该评估方法能够客观、合理地评估固体环网柜的绝缘状态,为固体环网柜状态检修提供参考。

In allusion to the assessment on insulation state of solid-insulated ring main unit, a novel method for assessment and classification of its insulation state under the condition of not existing standard fault model is proposed. Through improving calculation method in traditional gray target theory, a method to calculate the approaching degree of the improved weighted gray target is achieved. For the weights of various indicators a weighting method combining analytic hierarchy process with entropy weight method is adopted to calculate the impacting weight of various indicators to solve the problem that various insulation parameter indicators differently impact the assessment result of insulation state. According to the features of solid-insulated ring main unit of its own, a strategy to classify the insulation state of solid-insulated ring main unit is given. Finally, the validity of the proposed assessment method is verified by experiments, and the results of the verification show that the proposed method can assess the insulation state of solid-insulated ring main unit objectively and reasonable, and the assessment results are available for reference to condition based maintenance of solid-insulated ring main units.