Research On Arcless AC Contactor With Controllable And Isolable Function Based On Wireless Communication

The arcless AC contactor of textual research can adopt the bidirectional thyristor in parallel with the main contact of AC contactor,controlled by the control circuit of MOC3083.There is no clear breakpoint between the bidirectional thyristor and the main contact of contactor,which cannot assure the bidirectional thyristor and the main circuit is completely isolated.Once the bidirectional thyristor breaks down,it will be fed into the electrical power distribution,which results in a series of dangerous situation.In order to isolate the main circuit,the isolating contact is set in the parallel branch by the control of relay.Meanwhile,when arcless AC contactor is breaking,it produce large arc,and the short-time current will exist in the parallel branch.The size of the parallel branch current is detected,which can understand the failure status of bidirectional thyristor in real time.The duration of the parallel branch current is shortest,so the current detection of parallel branch should adopt the circuit with precise element of current detecting—ACS758.When arcless ac contactor start and stop,a series of actions are conducted through isolating contact,and the current of the parallel branch can be detected,which realizes controllable and isolable function.Nowadays,intelligent electrical appliance is the development trend of the electrical appliance.By circuits of electric parameter acquisition,voltage and current waveform can be displayed.Meanwhile,running status of arcless AC contactor can also be displayed.These data are transferred to PC by wireless transceiver module.The system PC program is designed to use LabVIEW software.Using STM32 MCU,as core controller,control series of system modules.Finally,based on the breaking-closing effect of the device,large number of trials are conducted,and gain good test effect.