从图4中可以看出，当m=3，4,5,6时，分别可以将4种不同工况得到较

It can be seen from Figure 4 that when m = 3, 4, 5, 6 respectively, 4 different working conditions can be distinguished, especially the normal working condition, the contact is loose, and the contact is off. The distinction is more obvious in different states. In summary, this paper chooses τ = 1, m = 3, m = 4, m = 5, m = 6, s = 20 as the feature selection parameters of CWPE in this paper, and compares the values ​​through evaluation indicators.

从图4中可以看出，当m=3，4,5,6时，分别可以将4种不同工况得到较好的区分，尤其是正常工况，触头松动状态，触头脱落三种不同的状态，区分度较为明显。综上所述，本文选择选择τ=1，m=3，m=4,m=5,m=6，s=20作为本文CWPE的特征选择参数，并通过评价指标分别进行取值对比。

It can be seen from Fig. 4 that when m = 3, 4, 5 and 6, four different working conditions can be distinguished well, especially three different states, i.e. normal working condition, contact loose state and contact falling off, with a relatively obvious degree of differentiation. In conclusion, τ = 1, M = 3, M = 4, M = 5, M = 6, s = 20 are selected as the characteristic selection parameters of cwpe in this paper, and the values are compared through the evaluation indexes.<br>