| Along with the development of society and technology, power consumption alsoincreases gradually, and at the same time, the power quality problem has become moreserious, more and more reliable power supply more attention. According to the statisticaldata shows that the distribution of fault blackouts accidents accounted for95%of totalnetwork. So after failure, can detect the fault and locate the fault has very importantsignificance to quickly and effectively.At present, neutral non effective grounding system in the distribution network inChina has been widely adopted, and the fault in the distribution network with80%arecaused by single phase to ground fault. When the single-phase grounding fault occurs, thefault current flows through the fault point is small, so the system lines allow faultoperation for a period of time, without interruption operation immediately. But when thecable lines increases, will make the grounding capacitive current will also change, so thefault zone to run for a long time, it may cause the expansion of the fault, and the non faultphase voltage increases, especially in the event of arc grounding fault, may cause the arcgrounding overvoltage, the ground voltage is too high, will lead to the destruction ofinsulation weak part in the system, and makes the system equipment was damaged and athreat to network security.For the insulator fault is one of the leading causes of single-phase to ground fault inneutral point detection of insulators, and the distribution network fault in non effectivegrounding system fault positioning method through a monitoring device for groundingcaused by insulator design single-phase fault. The equipment adopts a nanocrystallinematerial as the draw out coil material, when the tower grounding or insulator end produce the fault current, the draw out coil can be taken and stored. This device in thewireless module can through the DC-DC device to take energy and emission fault signal,realize fault location. And the device has stable operation, accurate positioning and lowinvestment. Experiments prove that the device can effectively locate single phase causedby insulator flashover grounding, grounding faults. |
