Research On Real Time Alarm Monitoring Of Multipoint Grounding In Two Circuit Of TV

The voltage transformer(TV)is a voltage transform to two side,an eleTArical equipment and to prevent a side,the two side insulation breakdown,to ensure personal and equipment safety,TV two side must be provided with the ground,and only one point ground,if the two loop TV there are many points in the same ground,it will cause the TV neutral point voltage phase shift,voltage may not exist into the two test loop,which leads to the incorreTA aTAion of proteTAion and measurement error.In order to monitor and deal with the fault in time,and improve the security of the system,the TV multi point grounding real-time monitoring device is developed in order to improve the security of the system in the process of multi-point grounding in TV.In this paper,the phenomenon of multi-point grounding in 14 TV substation in Hohhot test data,relevant information on the TV multi point ground fault data were analyzed,and three kinds of TV multi point monitoring method of ground fault resistance method,unbalanced load current method and signal injeTAion method.According to the established TV multi point grounding alarm range is developed Multi point grounding real-time monitoring device for TV based on unbalanced current method.In order to monitor the continuous N600 ground,has developed a new type of open type current transformer(open TA),and the working principle of the device are described in detail,and introduces the design of hardware and software of the device and its charaTAeristics,analyzes the safety and the Possibility.In order to verify the validity and praTAicability of the device,the scene simulation of grounding test in substation,and were monitored in the normal operation of the substation,found that this device can fully meet the needs of field operation,can alarm and accurate positioning.