Because of the complex operating conditions and multiple influence factors

each fault of the high voltage circuit breaker has a wide range of causes. On one hand

multiple types of fault signature signals may reflect the same fault;on the other hand

a signal may simultaneously characterize multiple variety of failures. What’s more

there may be incompatibilities between multiple types of faults. It can be seen that the incompatibility between multiple types of faults

as well as the diversity and complexity of faults

are the key and difficult points in the diagnosis of high voltage circuit breakers. It is noted that the existing high-voltage circuit breaker diagnostic methods are more emphasis on the diversity and complexity of faults

while ignoring the incompatibilities between different types of faults.In this paper

a multi-polar method for fault diagnosis of high voltage circuit breaker is proposed by means of multi-polar fuzzy sets in solving the advantages of multi-category incompatible classification characteristics. In the first place

the expert can evaluate the different kinds of faults that correspond to the same fault state according to the detection signal;Secondly

the weights of different detection signals are determined by the multi-polar entropy method. Then

a multi-polar VIKOR method is used to obtain the diagnosis results. Finally

the effectiveness and feasibility of the new method are verified through the case and comparative analysis of the fault diagnosis of high voltage circuit breaker.