The classification of electrical fault

According to the composition characteristics of electrical devices,from looking for electrical fault,from the viewpoint of the common electrical fault can be divided into three categories: 1.The power failure: lack of power,voltage,frequency deviation,the polarity of by phase line and neutral line and reverse,the lack of a power supply,phase sequence change,ac/dc mixed.2.The circuit fault: break,electric vehicle motor short circuit,short,grounding,connection error.3.The equipment and component failure: overheating burned,can not run,electrical breakdown,performance becomes worse.According to the fault phenomena analysis the cause of the problem,the key is to find electrical fault.Is based on the analysis of the basic theory of electrician,is for the electrical device structure,principle,performance,fully understand,ac electric motor is with the combination of the actual fault.


The causes of an electrical fault may be a lot of,it is important to find out the main reason in many reasons,and use approach to troubleshooting.For example,a three- phase cage asynchronous motor fault functioning,whatever the case,is the most concentrated performance motor does not work,but is not necessarily in the motor fault,and may be a power failure,may also be the failure of circuit or equipment and components.That is to say,the same failure form,failure of a variety of reasons.In these reasons,which is what reasons make the motor can't work,even after a deeper and more detailed analysis.For example: if the motor is used for acmotortrading.blogspot.com the first time,it should check power supply,circuit,the motor and load analysis; If the motor is used for the first time after repair,it should start from the motor itself check analysis; If the motor is running for a period of time suddenly can't run,it should check points off power supply and control components.Through the above process,then determine the specific cause of motor fault.