Satellite time synchronization based electric power line fault location system and method

Abstract

The invention relates to a satellite time synchronization based electric power line fault location system and a method and belongs to the technical field of smart power grid distribution automation. The system comprises a collecting indicator, collecting controllers, a master station and bus voltage collecting devices, the collecting indicator, the collecting controllers and the bus voltage collecting device are all provided with temperature compensation clock chips, and the master station and the collecting devices of the master station are provided with respective satellite time synchronization modules or satellite time synchronization devices to guarantee that data collected by parts of the system contain accurate time information. By means of a method that the collecting indicator synchronically collects three-phase current of a line and transmits the three-phase current to the collecting controllers by means of wireless communication for math composition of line zero-sequence current, the technical problem of collection of the line zero-sequence current is solved; by means of a distribution and centralization combined line single phase ground fault judgment method which mainly relies on the collecting controllers supplemented by the main station and other devices, data communication flows among the parts of the system are reduced, and data communication between the main station and the collecting controllers is reduced; and by means of a method which combines mobile wireless radio multicast services and point-to-point communication, communication efficiencies and fault location efficiencies of the parts of the system are improved.

Description

technical field [0001] The invention relates to the technical field of smart grid power distribution automation, in particular to a method for locating a power line fault based on satellite time synchronization and a system for realizing the method. Background technique [0002] At present, the fault location and distance measurement methods of power transmission lines mainly include impedance detection method, reactance detection method and traveling wave distance measurement method. The problem of the above methods is that the fault location deviation is relatively large. In my country's distribution network system, the small current grounding system is widely used, that is, the distribution system with the neutral point not grounded or grounded through the arc suppression coil. The distribution network frame is characterized by wide coverage, many branches, complex operating environment, and great influence from external factors. At present, the main method of fault loca...

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Problems solved by technology

[0002] At present, the fault location and distance measurement methods of power transmission lines mainly include impedance detection method, reactance detection method and traveling wave distance measurement method. The problem with the above methods is that the fault location deviation is relatively large

The problem existing in this invention is: all the data distributed in different points of the line with time labels are sent back to the main station for fault calculation and analysis, which will inevitably cause problems for the communication system, the data storage system of the main station, and the CPU of the main station. Bringing huge pressure and impact, although its technical principle is feasible, it is difficult to implement under the existing data communication and computer technology conditions

In addition to the common shortcomings of the invention patent CN201110438732.5, this patent does not propose how to solve the problem of zero-sequence current collection of overhead lines, and it is difficult to realize the application in overhead lines

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