Fault detector for intelligent on-line fault monitoring system of cable line

Abstract

The invention discloses a fault detector of an intelligent on-line fault monitoring system of a cable line. The fault detector comprises a housing, a singlechip control unit mounted in the housing, as well as a 2.4G wireless communication module, a current sensor and a light alarm module that are connected with the singlechip control unit, wherein the current sensor is connected with the cable line, collects 12 points of each cycle for fourier current calculation in real time and transmits collected information to the singlechip control unit; and the singlechip control unit accurately obtains a real-time on-line current value of the current line, carries out wireless bidirectional radio frequency short-distance communication with a centralized processor via the 2.4G wireless communication module and transmits collected data to the centralized processor for further processing. The fault detector can completely monitor fault situations such as short circuit, earthing, overload, line breaking, power failure, triphase unbalance, stealing and cutting on the line.

Description

technical field [0001] The invention relates to a fault detector used in an intelligent on-line fault monitoring system for cable lines, belonging to the technical field of line detection. Background technique [0002] In power distribution lines, due to reasons such as long lines, long branches, and complex structures, when faults such as short circuit, disconnection, power outage, three-phase imbalance, and overload occur, the fault point and cause of the fault cannot be detected in time. Then prolong the maintenance time, cause a large-scale power outage, and cause greater economic losses. At present, although fault detectors are also installed in cable lines, there are still several disadvantages: [0003] 1. The fault detector adopts differential and integral analog circuits, which are not sensitive to small current signals; [0004] 2. There is single-phase communication between the fault detector and the centralized processor. The monitoring center cannot remotely m...

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Problems solved by technology

[0003] 1. The fault detector adopts differential and integral analog circuits, which are not sensitive to small current signals;

[0004] 2. There is single-phase communication between the fault detector and the centralized processor. The monitoring center cannot remotely modify the detection parameters of the fault detector, and cannot eliminate the malfunction caused by the inrush current of the reclosing non-fault branch and the feedback power transmission. As long as there is a malfunction ( Refuse to move) then move forever;

[0005] 3. The fault detector can only collect and send current information, but cannot send out an alarm signal

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