Research and realization of signal detector in DC signal injection method

In the distribution network fault location, because of the cement pole earth fault and the existence of the wire distribution capacitance makes the C type traveling wave method and the AC signal injection method can not work effectively. DC signal injection method solves the problem of the two methods´ blind area. The advantage of it is free from to wire distributing capacitance influence, and the weakness is the signal would be difficult to detect. The paper gives the design of DC signal detector. It adopts the hall zero magnetic flux principle. The insulating rod is used in measurement operation to provide protection for the safety of the surveyor. C8051F310 MCU is used to realize A/D conversion. The detector uses the wireless technology to transfer data to the handle and then display it, which realized the separation of measure and display.