THFI series intelligent line fault indicator device indicating the line fault current path. Using a line fault indicator can quickly determine the time of short circuit and ground fault section completely change the past blind hunt, find fault section backward segmented closing, saving more than 80% of the time troubleshooting, making the line patrol officers to find The failed labor intensity is reduced by 90%, greatly improving the reliability of power supply. The products are widely used in oil fields, the city's overhead cable lines or switchgear box changes a device supporting, can be quickly and accurately determine the fault line and the point of failure. The product uses a micro-power, high-performance microcontrollers as a signal processing unit, use of modern digital signal processing techniques to identify the fault information, compared with the current market analog circuit fault indicator, scalability, consistency, stable performance, high precision, strong anti-jamming capability advantages. Ultrasonic, wireless communication technology, can also constitute the remote automatic fault monitoring system. Features automatically identify short-circuit fault adaptive function, overcurrent settings is set automatically according to the load current, and do not need to set the action value. Can detect ground fault short circuit THFI-II asymmetric current source ground fault indicator with the installation of the line (or substation) match, can be accurately detected ground fault (the specific principles, see below). THFI-II short circuit ground fault indicator the asymmetrical current source is not required, which utilizes the phase relationship between the pulse and the voltage of the current generated in the ground fault occurs to detect single-phase ground fault, and insulation breakdown caused by a ground fault detection accuracy rate high. Adaptive algorithm, installation direction requirements, to avoid the problems caused when the supply of the ring network to refuse to move and operation error, a national initiative. Uses 14-bit A / D converter fault waveform sampling, using wavelet transform to extract ground pulse, making the device has a high sensitivity and reliability of the single-phase ground fault detection. Automatically reset to factory settings reset time, time to time, automatically reset. Can confirm that the failure in order to avoid false indication requirements within seven seconds after the occurrence of the fault pulse voltage drop, so you can ensure that this time the switch to trip at a higher level. Inrush restraint algorithm unique inrush detection algorithm avoids line surge or flaring down power transmission due to the indicator malfunction problem. Insulated operating rod can be charged handling and installation, removal tool can be charged handling, to avoid loss of power outages caused by equipment installed. All-day instructions flop and light indication is a combination of both to meet the observation during the day, but also to meet the rainy days and night observation.