Overhead line short circuit grounding fault detection sensor

Abstract

The utility model relates to an overhead line short-circuit grounding fault detection sensor which is composed of a power transmission line power supply electricity taking device, a microcomputer and peripheral circuit, a Beidou / GPS positioning circuit, a current detection circuit, and a 4G / GPRS DTU transparent transmission and conversion circuit; the power transmission line power supply electricity taking device is responsible for taking electricity from an overhead line to charge a storage battery BT1; the Beidou / GPS positioning circuit is responsible for acquiring positioning and time service information from a Beidou / GPS satellite, the current detection circuit is responsible for measuring the current of an overhead line, the 4G / GPRS DTU transparent transmission and conversion circuit is responsible for wireless two-way transmission of data information, and the microcomputer and peripheral circuit enable the circuits to work in a coordinated mode through programs; and fault diagnosis and detection functions of three-phase short circuit, two-phase short circuit and single-phase grounding short circuit of the overhead line are completed. According to the invention, the working efficiency of fault repair is improved, the power failure cost is reduced, the working intensity of line patrol personnel is reduced, and the safety and reliability of the power transmission line are further improved.

Description

technical field [0001] The invention belongs to the fields of electric power automation, smart grids and sensors, and performs short-circuit grounding fault location, fault type judgment and fault monitoring by detecting the current of an overhead line. Background technique [0002] The power line is the lifeblood of the stable operation of the power system. It is responsible for the mission of power transmission, but due to the lack of protection, it is quite fragile. Any external force or misoperation by the operator may cause large-scale power outages and destroy the stable operation of the power system. , bringing serious harm to the social economy and people's lives. Therefore, it is of great significance to study the detection and diagnosis methods of transmission lines, determine the type of fault, and locate the fault point for timely handling of faults, ensuring the stable operation of the power system and reducing economic losses. [0003] At present, there are fe...

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Problems solved by technology

[0003] At present, there are few studies on distribution lines in China. The short circuit and ground fault of transmission lines are mainly judged by zero-sequence current and zero-sequence voltage detection. When this detection method fails, the fault diagnosis and positioning are mainly manual. Carried out in the way of inspection, low automation level, low real-time monitoring, high failure cost, and difficult to locate the fault point

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