Selective Leakage Protection Research Of Mine-used Low Voltage Feed Switch

Leakage protection technology have been developing rapidly, and the technology waswidely applied to the development of mine low-voltage feed switch. Compared with traditionalleakage protection device, selective leakage protection device only resect the fault line, whichreduced the power cut and also can quickly locate the location of fault point, these advantagesare obvious. Differential selective leakage protection technology according to the currentdifferential protection theory, which can identify the fault line and non-fault line rapidly and canbe used as an important basis for leakage protection.In view of this, in order to break through the reliability of defects and low sensitivity oftraditional feeder switch, designs a kind of feed switches which based on differential selectiveleakage protection. This device has good sensitivity and high reliability, it also has obviousadvantages when compared with the traditional leakage protection. Firstly, this paper analyzesthe principle and method of the differential selective leakage protection; Based on this, then setup system parameter model.At last, use AVR single chip microcomputer as the main controllerfor the system, then design control circuit and software design process, and then set up differentsystem and leakage fault parameters, and finally completed the design process.