Application Of COMPASS Timing In Single-phase To Ground Fault Location Of Distribution Network

This paper studies the application and realization of COMPASS timing in location of single-phase to ground fault location in non-grounded distribution system. According to the project requirement, a fault location device based on method of phasor comparison of zero-sequence current is developed, which includes both the hardware design and software design.The typical fault location methods are classified and analyzed and phasor comparison of zero-sequence current is chosen as the fault location algorithm, in view of the characteristics of our distribution network. The hardware is composed of two parts. The former is a fixed device which is installed in a substation to collect zero-sequence voltages. The later is a mobile device composed of a human held device and three clamp ammeters, and is carried along lines to collect zero-sequence currents. The1PPS controls the data acquisition and UTC supplies the flag of time. The mobile device receives the zero-sequence voltages through GSM and gives the result of fault location.The hardware mainly includes ARM embedded development board, C8051F310microcontroller, COMPASS timing module, GPRS module and RF wireless transceiver module. The serial communication between COMPASS timing module and ARM embedded development board is realized by a program coded with C#on the.NET Compact Framework3.5platform in Windows CE operating system, which can receive and abstract the UTC information etc. The software functions of communication between ARM embedded development board and GPRS module, GPRS modules, RF wireless transceiver modules and corresponding AD acquisition are designed and realized. Difficulties related of the device are analyzed in-depth. Finally, the device has been tested on a platform in laboratory to analyze its feasibility and reliability.