Method and system for locating fault of high-voltage transmission line

Abstract

The invention discloses a method and a system for locating a fault of a high-voltage transmission line. According to the method and the system disclosed by the invention, a current transformer is arranged at a tower needing to be located of an erected high-voltage transmission line and is used for sending acquired current information to a current signal processing unit; the current signal processing unit is used for determining whether fault current at the tower is in accordance with the load current in direction according to the current information so as to obtain a current direction result; the current direction result is sent to a remote server by a wireless unit; the remote server is used for collecting the current direction results of all towers; when the current direction results of certain two adjacent towers are both opposite, a fault point of the high-voltage transmission line can be determined to be between the two towers. Thus, the fault point of the high-voltage transmission line can be accurately located, and rapid fault location and precise overhauling are facilitated.

Description

technical field [0001] The invention relates to the field of detecting high-voltage transmission lines, in particular to a fault location method and system for high-voltage transmission lines. Background technique [0002] In order to reduce heat loss and materials for power transmission during long-distance transmission of electric energy, high-voltage transmission lines are usually used to transmit electric energy. Specifically: install multiple pole towers on the transmission path, erect high-voltage transmission lines through the pole towers, and set up substations at both ends of the transmission path. The line is transmitted to the destination substation, and then converted to low voltage by the destination substation for use by user equipment. When a fault occurs on a high-voltage transmission line, such as a short circuit or an open circuit, it will affect the transmission of electric energy. Therefore, it is very important to measure the fault location of the high-...

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Problems solved by technology

[0008] However, the fault location method of the high-voltage transmission line in this way cannot accurately determine the fault point of the high-voltage transmission line

This is because the high-voltage transmission line is erected with multiple towers, the longer the distance of the high-voltage transmission line and the more rugged the site environment, the more towers are used and the greater the sag of the high-voltage transmission line erected between the towers ,like figure 2 as shown, figure 2 It is a schematic diagram of a high-voltage transmission line erected between poles and towers in the prior art. After calculating and determining the fault distance between the high-voltage transmission line and the busbar, the fault point must be determined, but because the high-voltage transmission line erected between the poles and towers has a sag , so when the fault point is determined by the fault distance from the high-voltage transmission line to the bus, there is a large distance error between the determined fault point location and the actual fault point location

figure 2 The actual fault point is at point A of the high-voltage transmission line, but the fault point determined according to the fault distance from the high-voltage transmission line to the bus is point B. It can be seen that there is a distance between point A and point B. During maintenance, if you go to point B for maintenance, the fault point may not be detected, which will cause trouble for the location and maintenance of the fault point, especially in a rugged environment, the greater the sag of the high-voltage transmission line, the greater the distance error bigger

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