CN101989470A

CN101989470A - Anti-theft cable

Info

Publication number: CN101989470A
Application number: CN2009101624887A
Authority: CN
Inventors: 黎剑; 朱敏林
Original assignee: GuangDong KeNeng Electrical Co Ltd
Current assignee: GuangDong KeNeng Electrical Co Ltd
Priority date: 2009-08-06
Filing date: 2009-08-06
Publication date: 2011-03-23

Abstract

The invention relates to the technical field of electrical materials, in particular to an anti-theft cable comprising a signal transmission wire and a cable, wherein the signal transmission wire and one of conducting wires in the cable form a circuit. The anti-theft cable has simple structure, simultaneously improves the stability and reliability of a system, and has an anti-theft function under the condition of hardly increasing cost.

Description

A kind of antitheft cable

Technical field:

The present invention relates to the electrical materials and appliances technical field, refer in particular to a kind of antitheft cable.

Background technology:

At present, along with the rise of metal prices such as copper, the steal phenomenon of cable also is on the rise.Hitting the criminal activity of stealing cable has become the whole people's obligation movable.In this process, also there are some relevant burglar alarm products to emerge, but all there is the high phenomenon of rate of false alarm in these products, it is exactly the cable that gently makes a movement, will give the alarm, even some product rate of false alarm is relatively low, but operation cost and cost are too high, have a few even surpassed the cost of stolen cable.First kind is electric current testing.This comprises leakage current detection method and operating current detection method.

It is exactly leakage current at cable front-end detection whole piece cable that leakage current detects ratio juris, and at the cable end piece circuit of connecting, makes detected cable all have the Ground leakage current of a rated range to exist all the time.In case cable is cut, detects and promptly report to the police less than this leakage current.Perhaps, the method also has certain effect in the circuit that newly lays, but along with wearing out of circuit, the leakage current of initial setting up no longer is a steady state value, has become the underrange of a change at random, do not had practical significance and detect this underrange, failed to report, report by mistake and happen occasionally.

Operating current detection ratio juris is that the size of current and the set point of the cable in the testing made comparisons, thereby judges whether cable is operated in normal condition.When cable is non-loaded, add specific signal in the line, detect this signal again and whether judge normally whether cable is stolen.This electric current testing is to change by the detection electric current to judge whether whether final decision reports to the police within the scope of reporting to the police.In fact, cause that the operating current in the circuit is a lot of in the factor that changes, as voltage, load or the like.Therefore, if the excursion that the electric current in the testing circuit detects too little (too sensitive), in the circuit a little electric current a bit change and will report to the police, the probability that wrong report occurs is very high.If the scope that detects strengthens, having a little electric current to change in the circuit promptly includes within the safe range, so, the robber steals a disconnect cable but can not cause that (the final stage cable as public lighting circuit is stolen under the situation that big electric current changes, see the operating current that has just reduced by a street lamp from the excursion of electric current), the safe current scope set within, just do not report to the police, occur fail to report again by this anti-theft device for the electric current of this variation.

Second kind is the input method.Input normally cable two ends all has equipment, according to the difference of end-equipment, is divided into active signal detection method and passive signal detection method.

Active signal detects at cable end piece and adds active parts, transmits information with the pattern of replying with front end, guarantees that the head and the tail communication is normal, judges with this whether circuit is normal.The mode of this transmission information is power line carrier and wireless dual mode normally.Often the distance of transmission is not long in the public lighting circuit of complexity for the former, and to add the relay module usually and assist transmission, and, in case non-transformer in the circuit then can only rely on the battery operated of self.The life-span of battery directly has influence on the life-span of whole system.Though passive signal detects the life problems of having avoided above-mentioned battery, add special-purpose signal in the line, and reliability is not high.Though the phenomenon that the transmission that the complexity of the circuit that wireless transmission information is avoided causes is not smooth, end needs power supply, and the life-span of reserve battery directly determines the life-span of product.

Summary of the invention:

The objective of the invention is at the deficiencies in the prior art, and a kind of antitheft cable is provided, it is simple in structure, simultaneously, has improved the stability of a system and reliability, under the condition that increases cost hardly, makes cable possess anti-theft feature.

For achieving the above object, the present invention adopts following technical scheme: it comprises signal transmssion line, cable, and any lead in signal transmssion line and the cable constitutes a loop;

Be connected with alarm in the loop of described signal transmssion line and cable circuit;

Described alarm is the wireless transmission alarm.

Beneficial effect of the present invention is: any lead in signal transmssion line and the cable constitutes a loop, it is simple in structure, signal transmssion line detects the break-make that level value in this loop can be judged this cable, it is logical and disconnected that this level value has only two states---high level state and low level state, the state of corresponding cable also have only two kinds---; Solved traditional burglary-resisting installation and relied on analog quantity to detect, simultaneously, improved the stability of a system and reliability, under the condition that increases cost hardly, made cable possess anti-theft feature to digital quantity detects.

Description of drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a fundamental diagram of the present invention.

Embodiment:

See shown in Fig. 1,2: the present invention includes signal transmssion line 1, cable 2, it is characterized in that: any lead in signal transmssion line 1 and the cable 2 constitutes a loop;

Be connected with alarm 3 in the loop of described signal transmssion line 1 and cable 2 circuit; Signal transmssion line 1 can be very thin signal transmssion line, and it does not take very big space, and production cost is also low simultaneously.

Described alarm 3 is the wireless transmission alarm, after cable is cut off, detects the break-make that level value in this loop can be judged this cable, and this level value has only two states: high level state and low level state; The state of corresponding cable also has only two kinds---switches on and off; At this moment, alarm 3 can be notified relevant department by radio alarming, and can demonstrate the cut place of cable.

Add a bars transmission line 1 in common cable, this signal transmssion line 1 does not influence the operate as normal of cable, and it transmits as signal simultaneously, the current-carrying of not loading, and under the condition that does not influence tensile strength, sectional area can be done very for a short time, to reduce cost.

Add such holding wire, can form a loop with any single line in original cable; Detect level value in this loop and can judge the break-make of this cable, this level value has only two states: high level state and low level state; The state of corresponding cable also has only two kinds---switches on and off.This just becomes traditional burglary-resisting installation and relies on analog quantity to detect to digital quantity detects, and has improved the stability of a system and reliability, makes cable possess anti-theft feature under the condition that increases cost hardly.

The above only is preferred embodiment of the present invention, so all equivalences of doing according to the described structure of patent claim of the present invention, feature and principle change or modify, is included in the patent claim of the present invention.

Claims

1. antitheft cable, it comprises signal transmssion line (1), cable (2), it is characterized in that: signal transmssion line (1) constitutes a loop with any lead in the cable (2).

2. a kind of antitheft cable according to claim 1 is characterized in that: be connected with alarm (3) in the loop of described signal transmssion line (1) and cable (2) circuit.

3. a kind of antitheft cable according to claim 2 is characterized in that: described alarm (3) is the wireless transmission alarm.