基于故障率研究的数字保护最优检修周期

The optimal maintenance intervals of digital relay protection based on failure rate analysis

从保证智能变电站数字保护系统可靠性的角度建模,采用威布尔分布模拟数字保护装置故障率模型,通过L-M算法对保护装置故障率函数进行拟合。针对保护装置修复非新的特性,分析数字保护装置不同检修类型对故障率的影响,利用检修役龄递减因子和故障递增因子对保护装置检修前后故障率进行预测,推导得出数字保护装置故障检修模型。通过此模型计算得出的保护装置非定期检修周期,可保证数字保护装置经济可靠运行。该方法是一种具有实际意义的数字保护系统可靠性评估方法。

The failure rate of digital protection device which is simulated by Weibull distribution and fitted by the L-M algorithm is constructed with the viewpoint of relay protection system in smart substation reliability. According to the character of imperfect maintenance, with the impacts of different types of maintenance and the prediction of the failure rate of age reduction factor and hazard rate increase factor, the model of the maintenance failure rate of digital protection device can be extrapolated, With this model, the optimal strategy of non-regular maintenance intervals which is useful for running the device economic and reliable can be worked out. Analysis of example shows the effectiveness of this method.