A Hierarchical Fuzzy Comprehensive Evaluation Algorithm for Running State of a 6 kV (10 kV) Power Switch Cabinet

Table 1

Comments collection of the switch cabinet.

	Working state	Components aging degree	Failure possibility	Examination and reparation
Great ()	stable	very low	very low	no
Good ()	good for a long time	a certain degree	low	no
General ()	normal	no serious damage	increasing	no
Careful ()	abnormal	high or abnormal	high	yes

Great: the switch cabinet’s working state is stable; each component works good; the failure possibility is very low; Good: the switch cabinet has been running for a period, some electrical components have a certain degree of aging, and vacuum circuit breaker has a certain degree of electrical wear. But the test data of power off and on is normal; the working performance is generally stable; the possibility of fault occurrence is low; the maintenance is not necessary; General: electrical components in the switch cabinet have no serious damage; the possibility of failure increases somewhat, yet it will not pose a threat to the safe operation temporarily; it is necessary to analyze and judge the specific abnormal types of electrical components; Careful: running or testing data from the main electrical components is abnormal dramatically; faults may occur; it is advisable to cut off the power supply and overhaul the power switch cabinet, finding the cause of abnormal conditions or abnormal components; the engineers consider replacing the specific equipment if necessary.