Evaluation of protection through effective monitoring,while using scientific and objective evaluation method,can timely and accurately grasp the operation status of equipment,so as to arrange the maintenance plan,shorten maintenance time and improve the quality of maintenance.In this paper,the shortcomings of the existing evaluation methods of protection are studied and compared.A fuzzy comprehensive state evaluation method of protection with changeable membership degree is proposed.Firstly,the protection status evaluation index system is further improved.A new evaluation index and deterioration degree calculation model are added.Secondly,a variable membership function model based on the variable coefficient,normal distribution and the comment set as the 4 area is proposed and the dynamic correction of membership fuzzy judgment matrix is considered.A new method of dynamic correction of fuzzy matrix is proposed.A variable weight function with variable amplitude and variable weight coefficient is constructed.Finally,the method is used to evaluate the state of the device,and the feasibility and advantage of the method is verified.%继电保护的状态评价通过对保护设备的有效监测,同时引入科学客观的评价方法,可以及时准确地掌握设备的运行状况,从而合理安排检修计划,大幅缩短检修时间和提高检修质量.研究和对比了现有继电保护状态评价方法的不足之处,提出了一种考虑隶属度可变的继电保护变权模糊综合状态评价方法.首先完善了继电保护状态评价指标体系,并增加了新的评价指标和劣化度计算模型.其次提出了基于系数可变、正态分布且评语集为4区的可变隶属度函数模型,并考虑了隶属度模糊判别矩阵的动态修正问题,提出了效果更加明显的模糊矩阵动态修正方法.构造了幅度有区别且变权系数可调的惩罚—激励型变权函数.最后,在算例中利用该方法对某设备进行了状态评估,并验证了该方法的可行性和优势.
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