CN103337119A - Burglary-resisting monitoring and positioning method for armored cable - Google Patents
Burglary-resisting monitoring and positioning method for armored cable Download PDFInfo
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- CN103337119A CN103337119A CN2013102280712A CN201310228071A CN103337119A CN 103337119 A CN103337119 A CN 103337119A CN 2013102280712 A CN2013102280712 A CN 2013102280712A CN 201310228071 A CN201310228071 A CN 201310228071A CN 103337119 A CN103337119 A CN 103337119A
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Abstract
The invention particularly discloses a burglary-resisting monitoring and positioning method for an armored cable, which comprises the following steps: 1, selecting a grounding point at one end of a cover layer of the armored cable to be monitored to serve as a testing point; 2, piling a pile at the place near the grounding point selected in the step 1, and sleeving a transformer on a grounding wire of the cover layer of the armored cable; 3, sending signal at specific frequency by an armored cover layer burglary-resisting monitor terminal, and coupling the signal into the armored cover layer through the grounding pile; 4, receiving the specific frequency signal and reflected signal of the armored cover layer by the armored cover layer burglary-resisting monitor terminal through the transformer; 5, in case the armored cover layer is damaged, breaking point occurs or impedance is increased, detecting the reflected signal at the signal emission point, and calculating the distance between the break point and the signal emission point through detecting the time difference between the transmission signal and reflected signal.
Description
Technical field
The present invention relates to a kind of cable theft-prevention technical field, relate in particular to the method that a kind of armored electric cable theft prevention detects and locatees.
Background technology
Along with China's rapid development of economy, the urban power consumption increases day by day, to the also raising day by day of safety requirements of electrical network and design thereof.For the critical facility of electrical network, sheathed cable, because artificial pilferage and external construction, malicious event frequently takes place, and has caused tremendous loss to work production and daily life.So the monitoring to sheathed cable is imperative.
At present, a lot of products about armored electric cable theft prevention have been arranged on the market, have all had problem in various degree:
1. armouring anti-theft product on the market, when sheathed cable is cut off or is stolen, warning device just can send the alerting signal of sound or light, when but some thiefs are stolen, generally not that whole cable cutting stolen, but the screen layer below the armor is stolen, because the induced voltage on armor and the screen layer is very low, the conductor layer of sheathed cable, flame retardant coating and insulation course be not again by broken meeting, can not influence normal power supply, so it is stolen to be difficult to detect sheathed cable, thereby cause anti-theft effect poor.
2. the patent No. is 201220561755.5 " the online antitheft anti-outside destroy monitoring alarm of sheathed cable ", description according to its technical scheme and claims, this patent can only realize the whether ruined monitoring of sheathed cable closed-loop path, when destroying, can report to the police, all do not mention in technical scheme and claims and the case study on implementation and can locate breakdown point, so can't realize location to the sheathed cable breakdown point from this patent of the angle of technology location.
3. infrared detecting method, its ultimate principle are by at conduit line the infrared monitoring device being installed, and whether the someone enters conduit line in monitoring, thereby carries out cable anti-theft alarm.The shortcoming of this method is easy wrong report.
4. also have the mode by current-voltage transformer, its principle is by installing current-voltage transformer additional at cable core, by detecting the variation of current/voltage, carrying out cable anti-theft alarm.The shortcoming of this mode is not report to the police when screen layer does not cut off heart yearn when the robber shells, and cable can't burglar alarm under stand-by state.
5. power carrier method, its ultimate principle are by in the cable core load signal, adopt Principle of Communication, carry out cable anti-theft alarm.Shortcoming is not report to the police when screen layer does not cut off heart yearn when the robber shells, and often reports by mistake when load current changes greatly, influences original cable insulation state, can not locate breakdown point.
6. the patent No. is 201010117339.1 " a kind of sheathed cable is put the outside destroy monitoring and positioning method ", need directly touch armor or copper shield could be monitored changes in capacitance, thereby realizes the location.This method can cause the electric parameter of cable to change, thereby cable security and life-span are brought uncertain influence, is unfavorable for the safe operation of cable.
Summary of the invention
The objective of the invention is in order to address the above problem, the method that provides a kind of armored electric cable theft prevention to detect and locate, the method can realize by the noncontact mode, armouring sheath to sheathed cable carries out on-line monitoring, when the armouring sheath of sheathed cable is destroyed, can realize the warning of fault and the location of trouble spot.
For achieving the above object, the present invention adopts following technical scheme:
The method of the monitoring of a kind of armored electric cable theft prevention and location is at an earth point of the armouring sheath of sheathed cable alternating layers to be sent the signal of characteristic frequency, detects reflected signal at this point simultaneously.When the armouring sheath is intact, monitor less than reflected signal at this point.The armouring sheath of electric power sheathed cable is two-terminal-grounding in practice of construction.
The method of described a kind of armored electric cable theft prevention monitoring and location, the concrete grammar step is as follows:
The sheathed cable of step (1) to monitoring selects a termination place of its sheath as test point;
Step (2) is made a call to a pile nearby at the selected earth point of step (1), simultaneously socket mutual inductor on this sheathed cable sheath ground wire;
Step (3) armouring sheath anti-thefting monitoring terminal sends the signal of characteristic frequency, by grounding post, signal is coupled in the armouring sheath by earth terminal;
Step (4) armouring sheath anti-thefting monitoring terminal receives the reflected signal of the set specific frequency signal in the armouring sheath by mutual inductor;
Step (5) is when the armouring sheath of sheathed cable is destroyed, the situation of breakpoint or impedance increase can appear in the armouring sheath, can detect reflected signal transmitting this moment, by the mistiming of detection of transmitted signals and reflected signal, can calculate the distance of breakdown point and signal launching site, thereby accurately locate the position of armouring sheath breakdown point.
Described computing method are as follows, suppose that the zero-time that transmits is T1(s); The zero-time of receiving reflected signal is T2(s); Signal transmitting speed in the armouring sheath is V;
Armouring sheath breakdown point is apart from the calculating of S: S=(T2-T1) * V/2
The method of described a kind of armored electric cable theft prevention monitoring and location is connected to realize antitheft monitoring to the sheathed cable alternating layers by armouring sheath anti-thefting monitoring terminal and pile and mutual inductor.
Described armouring sheath anti-thefting monitoring terminal comprises: be used for multiple-stage filtering unit that signal is carried out filtering, and the multiple-stage filtering unit links to each other with signal processing unit, describedly link to each other with the high-speed AD acquisition unit for the signal processing unit that signal is handled; Describedly link to each other with the MCU unit for signal being gathered with the high-speed AD acquisition unit of changing; Described MCU unit links to each other with signal transmitting unit, and signal transmitting unit and grounding post communication realize the transmission of set specific frequency signal, and signal multiple-stage filtering unit is connected with the armouring sheath by mutual inductor, realizes the reception of armouring sheath reflected signal.
The signal of described characteristic frequency is high-frequency signal, frequency at 10MHz between the 1000MHz.
Described mutual inductor is the high-frequency mutual inductance device, and the frequency range of the signal specific of its frequency response and emission adapts.
The measuring principle of this method is, when the armouring sheath of sheathed cable was destroyed, a kind of situation was that the armouring sheath is destroyed fully, breakpoint occurs, and it is not thorough that another kind of situation is that the armouring sheath destroys, and causes the alternating layers impedance to increase.A little can detect reflected signal transmitting this moment, by the mistiming of detection of transmitted signals and reflected signal, can calculate the distance of breakdown point and signal launching site, thereby accurately locate the position of armouring sheath breakdown point.
Beneficial effect of the present invention: by the enforcement of this method, can realize in the noncontact mode, armouring sheath to sheathed cable carries out on-line monitoring, when the armouring sheath of sheathed cable is destroyed, the situation that breakpoint or impedance increase can appear in the armouring sheath, and can detect reflected signal transmitting this moment, by the mistiming of detection of transmitted signals and reflected signal, can calculate the distance of breakdown point and signal launching site, thereby accurately locate the position of armouring sheath breakdown point.Simultaneously, non-contacting mode can not cause the electric parameter of sheathed cable to change, to cable security and life-span without any influence, ensured the safe operation of sheathed cable.
Description of drawings
Fig. 1: a kind of enforcement synoptic diagram of the present invention;
Fig. 2: the composition synoptic diagram of armouring sheath anti-thefting monitoring terminal;
Among the figure, 1. armouring sheath anti-thefting monitoring terminal 2. receives mutual inductor, 3. grounding post, 4.MCU unit, 5. signal transmitting unit, 6. energy-storage units, 7. high-speed AD acquisition unit, 8. signal processing unit, 9. signal multiple-stage filtering unit.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
As shown in Figure 1, electric power sheathed cable armouring sheath two-terminal-grounding, select an earth terminal of armouring sheath, armouring sheath anti-thefting monitoring terminal 1 sends to the earth by grounding post 3 with the signal of characteristic frequency, the sheathed cable sheath is coupled to this signal by the earth, and signal just transmits along armouring sheath direction like this.Equally, armouring sheath anti-thefting monitoring terminal 1 is by receiving the set specific frequency signal that mutual inductor 2 receives the internal reflection of armouring sheath, when the armouring sheath of sheathed cable is destroyed, the situation of breakpoint or impedance increase can appear in the armouring sheath, can detect reflected signal this moment, by the mistiming of detection of transmitted signals and reflected signal, can calculate the distance of breakdown point and signal launching site, thereby accurately locate the position of armouring sheath breakdown point.Computing method are as follows:
The zero-time that transmits is T1(S);
The zero-time of receiving reflected signal is T2(S);
Signal transmitting speed in the armouring sheath is V;
Armouring sheath breakdown point is apart from the calculating of S: S=(T2-T1) * V/2
As shown in Figure 2, armouring sheath anti-thefting monitoring terminal 1, at least comprise MCU unit 4, MCU unit 4 is connected with the high-speed AD acquisition unit with signal transmitting unit 5, signal transmitting unit 5 is connected with energy-storage units 6, high-speed AD acquisition unit 7 is connected with signal processing unit 8, and signal processing unit 8 is connected with signal multiple-stage filtering unit 9.
At first, MCU unit 4 is main control units of armouring sheath anti-thefting monitoring terminal 1, and MCU unit 4 control signal transmitting elements 5 are coupled to the signal of characteristic frequency by grounding post 3 armour protective layer of sheathed cable.Energy-storage units 6 provides the energy that sends signal for signal transmitting unit 5.
After signal sent, the circuit of signal receive section started reception synchronously.The reception of signal is connected the coupled reflection signal by receiving mutual inductor 2 in the noncontact mode with the armouring sheath.When armor does not have when destroyed, a kind of situation is can only detect the transmission signal, and not have reflected signal.Another kind of situation is the reflected signal that can detect sheathed cable opposite end earth point, because the length of known sheathed cable, so this kind situation can be got rid of.
When armor is destroyed, signal multiple-stage filtering unit 9 receives reflected signal by receiving mutual inductor 2, carry out effective filtering to received signal, remove noise signal, extract effective frequency signal, send to signal processing unit 8 then and carry out the amplification processing of signal amplitude, after finishing dealing with, offer high-speed AD acquisition unit 7, carry out high-speed sampling, sampled result offers MCU unit 4, Intelligent treatment and calculating by MCU unit 4, draw the normal and unusual judgement of armor, if normal, proceed monitoring; If unusual, will provide abnormal alarm, calculate the accurate position of destroyed point simultaneously.
Though above-mentionedly by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (5)
1. the method for armored electric cable theft prevention monitoring and location is characterized in that step is as follows:
The sheathed cable of step (1) to monitoring selects a termination place of its sheath as test point;
Step (2) is made a call to a pile nearby at the selected earth point of step (1), simultaneously socket mutual inductor on this sheathed cable sheath ground wire;
Step (3) armouring sheath anti-thefting monitoring terminal sends the signal of characteristic frequency, by grounding post, signal is coupled in the armouring sheath by earth terminal;
Step (4) armouring sheath anti-thefting monitoring terminal receives the reflected signal of the set specific frequency signal in the armouring sheath by mutual inductor;
Step (5) is when the armouring sheath of sheathed cable is destroyed, the situation of breakpoint or impedance increase can appear in the armouring sheath, can detect reflected signal transmitting this moment, by the mistiming of detection of transmitted signals and reflected signal, can calculate the distance of breakdown point and signal launching site, thereby accurately locate the position of armouring sheath breakdown point.
2. the method for claim 1 is characterized in that, the distance calculating method of the described calculating breakdown point of step (5) and signal launching site is as follows:
Suppose: the zero-time that transmits is T1; The zero-time of receiving reflected signal is T2; Signal transmitting speed in the armouring sheath is V; Then armouring sheath breakdown point is apart from the calculating of S: S=(T2-T1) * V/2.
3. the method for claim 1, it is characterized in that, the described armouring sheath of step (4) anti-thefting monitoring terminal comprises: for the multiple-stage filtering unit that signal is carried out filtering, and the multiple-stage filtering unit links to each other with signal processing unit, describedly links to each other with the high-speed AD acquisition unit for the signal processing unit that signal is handled; Describedly link to each other with the MCU unit for signal being gathered with the high-speed AD acquisition unit of changing; Described MCU unit links to each other with signal transmitting unit, and signal transmitting unit and grounding post communication realize the transmission of set specific frequency signal, and signal multiple-stage filtering unit is connected with the armouring sheath by mutual inductor, realizes the reception of armouring sheath reflected signal.
4. the method for claim 1 is characterized in that, the signal of described characteristic frequency is high-frequency signal, frequency at 10MHz between the 1000MHz.
5. the method for claim 1 is characterized in that, described mutual inductor is the high-frequency mutual inductance device, and the frequency range of the signal specific of its frequency response and emission adapts.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592577A (en) * | 2013-11-26 | 2014-02-19 | 南京航空航天大学 | Integrated directional non-contact cable fault detection positioning sensing device |
| CN103646488A (en) * | 2013-11-21 | 2014-03-19 | 广东电网公司惠州供电局 | An armored cable monitoring system and a method |
| CN105974244A (en) * | 2016-06-29 | 2016-09-28 | 西安秦骊成套电器有限公司 | Operating cable grounding state detection circuit and method using variable frequency resonant partial voltage |
| CN106341196A (en) * | 2015-07-16 | 2017-01-18 | 苏州宝时得电动工具有限公司 | Breakpoint detection equipment and method |
| CN107229002A (en) * | 2017-06-26 | 2017-10-03 | 仲杏英 | Electric wire breaking point detection device |
| CN113189440A (en) * | 2021-03-09 | 2021-07-30 | 浙江图维科技股份有限公司 | Lead sealing communication detection device and method based on signal coupling technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113189440A (en) * | 2021-03-09 | 2021-07-30 | 浙江图维科技股份有限公司 | Lead sealing communication detection device and method based on signal coupling technology |
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Address after: 250101 A203, block F, entrepreneurship square, Qilu Software Park, No.1 Shunhua Road, high tech Development Zone, Jinan City, Shandong Province Patentee after: Conway Communication Technology Co., Ltd Address before: 250101 Qilu Software Park, No. 1 Shunhua Road, Jinan High-tech Development Zone, Shandong Province, A 203 Patentee before: SHANDONG KANGWEI COMMUNICATION TECHNOLOGY Co.,Ltd. |
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