Cable burglar alarm system

Abstract

The invention discloses an antitheft and alarm system of a cable. A power supply end alarm module and an electric end alarm module have access to the portions, close to power supply equipment and electric equipment, of a power supply line of the system respectively in a series mode. The power supply end alarm module and the electric end alarm module comprise cable detecting boards. The position of a broken cable (short circuit or open circuit) can be detected through the cable detecting boards. High-voltage impulse waves are sent to the cable through an original point, when the impulse waves encounter a breakpoint or short circuit point, echoes can be generated and are reflected to the original point at the speed approximate to light speed, the original point measures the echoes at high speed and then calculates the time difference between emitting and the echoes, and therefore the length of the broken cable is obtained. Patrol personnel can reach the site in time through a vehicle, or start an alarm near the position of the broken cable after obtaining alarm information, the cable stealing behavior is stopped, the scheme is specifically designed to solve the problem of high-frequency loss of a low-voltage main cable, and high practicality is achieved.

Description

technical field [0001] The invention relates to the field of cable anti-theft alarm, in particular to a cable anti-theft alarm system. Background technique [0002] In recent years, cable theft activities have become increasingly rampant, and the anti-theft work of relevant management departments has become difficult. Frequent theft activities have brought many unstable factors to the society and caused huge economic losses. Therefore, the relevant management departments urgently need an effective cable anti-theft alarm system in order to improve the management level and deter criminals from stealing. [0003] Although the existing cable anti-theft methods are many at present, many have the problem of false alarm. The power carrier solution is a more advanced solution. Although it can detect multiple lines, it cannot report the specific location of the breakpoint. When the inspectors slowly search for the location of the breakpoint on the highway without street lights, they...

AI Technical Summary

Problems solved by technology

However, this scheme is connected in parallel on the cable so that there is a normal total impedance. If the cable is broken, the total impedance will become larger. According to the degree of impedance change, the distance of the broken cable can be roughly judged. The distance between street lamps is short, and the measurement error is acceptable. If the light distance is too large, it will seriously affect the ranging accuracy

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