According to the modified least square algorithm of system identification technique, a diagnostic model of power transformer fault is determined and described by fuzzyrelation matrix.
采用系统辨识的最小二乘法的改进算法，确定了一种用模糊关系矩阵表示电力变压器故障诊断模型。
2
Based on fuzzy theory, the fuzzyrelation between fault signs and fault reasons is analyzed. Then a fuzzy expert system for fault diagnosis in power plant is designed.
The qualitative judgment system based on fuzzy control was built after analyzing the relation between quality of spot welding and the box fractal dimension of signals in spot welding.