Anti-theft alarm method and device for street lamp cable with self-checking function

Abstract

The invention relates to the field of burglary prevention for street lamp cables and discloses an anti-theft alarm method for a street lamp cable with a self-checking function. An anti-theft front end is arranged in a substation control cabinet; the anti-theft front end provides a weak direct current for the street lamp cable at a time interval when a street lamp is not opened and switches the weak direct current into an alternating current for supplying power to the street lamp at a time interval when the street lamp is opened; the anti-theft front end detects the weak direct current and the alternating current on the street lamp cable to judge whether voltage and current are abnormal, determine types of abnormal states of the voltage and the current and transmit abnormal information of the front end simultaneously; and an anti-theft tail end is arranged in a terminal pole of the street lamp at the tail of the cable, and the anti-theft tail end judges whether a line is abnormal by detecting whether the voltage is present on the street lamp cable, transmits abnormal information of the tail end, and determines a fault result of the street lamp cable according to the front-end abnormal information of the anti-theft front end and tail-end abnormal information of the anti-theft tail end. The invention is applicable to anti-theft alarm for the street lamp cable.

Description

technical field [0001] The invention relates to a street lamp cable anti-theft alarm method and device with self-check function. Background technique [0002] With the development of the economy and the acceleration of urban modernization, street lamps have spread in every corner of life, affecting people's production and life. The vast majority of street lamp cables in my country use copper cores. Due to the sharp rise in copper prices in the market in recent years, many lawbreakers have taken risks and frantically stolen street lamp cables, especially in rural areas and remote areas. The theft of urban street lamp cables is very serious. Bring immeasurable economic losses. In addition, the theft of lighting cables has also brought great social harm to urban security. Large-scale power outages of street lamps may cause many traffic accidents and public security chaos; live exposed wires will threaten the lives of passers-by; It brings great inconvenience to the lives of en...

AI Technical Summary

Problems solved by technology

[0004] In the above schemes, the principle of the current detection method is: install two resistors in series at the terminal pole of the street lamp (that is, the last street lamp at the end far away from the substation) and at both ends of the substation, and add AC voltage to the cable circuit during the day , and judge whether the cable is stolen by detecting the divided voltage of the two resistors; at night, when the street lamp is in the power supply state, directly detect the cable loop current to judge whether the cable is stolen; this method has the following disadvantages: 1. The voltage of the power grid at night Large fluctuations lead to large current fluctuations, and there are large errors in actual use, which can easily cause false alarms; 2. If the position where the thief cuts the cable is close to the substation, the entire line will be disconnected, and the current will drop sharply, which is easy to judge The cable is stolen, and if the position of cutting the cable is close to the terminal pole of the street lamp, the current changes little before and after the cable is cut, and it is not easy to judge that the cable is stolen; 3. Because the resistance is easy to change, it is easy to switch between power supply and power failure 4. This method is based on the situation that one AC contactor controls one circuit. When one AC contactor controls multiple circuits, or one circuit has multiple street lamp terminal poles, this method cannot be used. method for anti-theft detection

[0005] Other solutions also have their own defects in actual use. For example, the carrier communication device is expensive, and is affected by the line transformer, compensation capacitor, and line impedance. The carrier signal attenuation is large, and it is difficult to use for anti-theft detection of long cables; It can complete the detection of line conditions during the day, and it can be completed by collecting circuit current after turning on the lights at night. Due to the influence of collection accuracy, cable leakage, lighting street lights and theft methods, sufficient accuracy cannot be guaranteed. At the same time, in rainy days and other weather case, prone to false positives

[0006] As can be seen from the above status quo, the current cable anti-theft alarm has a high false alarm rate, which brings great inconvenience to practical applications.

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