Abstract:Asynchronous motor is one of the important components of the main pump in the valve cooling system. Improving the level of fault identification and instantly locating the fault point are of great value for the valve cooling system. In this paper, a method of online detection of stator high resistance fault based on current unbalance degree is proposed by means of symmetric vector method. Specifically, this paper analyzes the index parameters to determine the fault phase and fault severity under the conditions of stator star connection and delta connection. Furthermore, by setting the voltage monitoring location reasonably, the fault detection range can be further reduced. Finally, the effectiveness of the proposed method is verified through simulation test and a case analysis.
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