CN102540014B - Online real-time anti-theft and anti-cut device and method for power cable - Google Patents
Online real-time anti-theft and anti-cut device and method for power cable Download PDFInfo
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- CN102540014B CN102540014B CN201110455012.XA CN201110455012A CN102540014B CN 102540014 B CN102540014 B CN 102540014B CN 201110455012 A CN201110455012 A CN 201110455012A CN 102540014 B CN102540014 B CN 102540014B
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Abstract
The invention discloses an online real-time anti-theft and anti-cut device and an online real-time anti-theft and anti-cut method for a power cable. The online real-time anti-theft and anti-cut device is characterized in that: the existing low voltage pulse ranging and resistance measurement are organically combined together so as to monitor the resistance between a copper shielding layer and a steel belt of the cable in real time; when a person steals and cuts the cable, the steel belt is disconnected from the copper shielding layer, a system measures that the resistance between the steel belt and the copper shielding layer is hundreds of kilohms or even infinite, the system immediately detects the position of a stolen cut point by a low voltage pulse method; and meanwhile, the system warns a client through the short message of the mobile phone, so that the client can rapidly and effectively find the person who steals and cuts the cable; in addition, the online real-time anti-theft and anti-cut device for the power cable can deter other criminals willing to steal and cut the cable, thereby effectively protecting the normal operation of the cable.
Description
Technical field
The invention belongs to the method for power cable anti-theft, the device and method that particularly a kind of anti-theft of that laid and moved or to be moved buried and channel-type power cable is monitored in real time.
Background technology
In recent years, for power cable, particularly the robber of the outer copper shield of mesohigh power cable outsourcing steel band more than 6Kv and three cores to cut phenomenon more and more serious, brought serious hidden danger to the safe operation of electric power system, found that the illegal robber person of cutting electrocutes the situation in conduit line.Although present video monitoring equipment technology is very ripe, it is obviously unpractical that video monitoring equipment is all installed on every cable duct, because expense too expensive.
Summary of the invention
The problem being cut for solving power cable, the present invention utilizes ripe resistive measurement and action of low-voltage pulse ranging technology to provide a kind of can monitoring in real time to apply the safety case that relates to power cable, can demonstrate the distance of the cable that is cut and the method for position at monitor terminal, can monitor the power cable of many different azimuth simultaneously simultaneously.
For reaching above object, the present invention takes following technical scheme to be achieved:
The online real-time anti-theft of power cable cuts a device, it is characterized in that, comprises a multicircuit switch, is connected and realizes multi-path monitoring input with the copper shield of many power cables with steel band, a CPU control module, carries out timesharing loop test by controlling multicircuit switch, the monitoring input of every power cable all enters into a function switch by multicircuit switch through passage I, CPU control module is measured the resistance of each cable by a resistance measurement unit, when cable is cut, CPU control module is controlled function switch and is switched to pulse ranging unit, and send one 5 volts by the I/O mouth of CPU control module, width is that the pulse signal of 0.1-1 μ s arrives pulse ranging unit, the low voltage pulse signal that the output of pulse ranging unit is one tens volts to 100 volts, the function switch of leading up to is added between the copper shield and steel band of cable through passage II and multicircuit switch, another road enters into a high-speed a/d converter and carries out analog to digital conversion, CPU control module obtains test data by high-speed a/d converter, shows after treatment by liquid crystal display, sends warning message by a short message alarm module simultaneously.
The online real-time anti-theft segmentation method of power cable that adopts said apparatus, specifically comprises the steps:
The first step, one end at cable separates copper shielding layer A and steel band B, and be linked into multicircuit switch, under normal circumstances, resistance between cable copper shielding layer and steel band is below several ohm, when having people to steal to cut cable, steel band and copper shield disconnect, and resistance measurement unit is that hundreds of is kilohm even infinitely great by measuring resistance between A, B;
Second step, CPU control module is transformed into pulse ranging unit by function change-over module immediately, by pulse ranging unit, produce the low voltage pulse signal of tens volts to 100 volts, the function switch of leading up to is added between the steel band and copper shield of cable through passage II and multicircuit switch, another road starts high-speed a/d converter and starts collecting test waveform, when pulse signal arrives cable outer layer cut-off point, just produce reflected impulse, high-speed a/d converter samples complete test waveform;
The 3rd step, high-speed a/d converter by the complete waveform data that collect after CPU control module is processed, by data processing and judge and steal cutpoint to the distance of cable control point, through the multi-functional output interface of CPU control module, export test waveform on liquid crystal display, start short message alarm module simultaneously and send alarming short message to cable management personnel, inform that being cut appears in that root cable and stolen cutpoint to the distance of control point.Wherein, described low pressure output pulse is that 80-100 volt, width are 0.1-1 μ s.
The inventive method is compared with existing method of testing, its advantage is, it combines existing resistance measurement and two kinds of methods of action of low-voltage pulse range finding, size by first measured resistance value judges whether cable is cut, when finding that the resistance of the resistance between copper shield and steel band is especially greatly even infinitely great, judge cable and be cut.Now CPU starts immediately action of low-voltage pulse range cells and tests out the stolen cutpoint of cable to the distance of control point, and sends warning message by note.
Hardware aspect, the present invention's resistive measurement used, action of low-voltage pulse ranging technology and note transmission technology are all existing mature technologies, and antijamming capability is strong, and monitoring effect is good in real time, and volume is little, lightweight, easy for installation.
Anti-theft supervising device of the present invention is arranged on a certain power supply terminal of cable conventionally, can monitor the power cable of many different azimuth simultaneously.
Accompanying drawing explanation
The online real-time anti-theft of Fig. 1 power cable cuts device wiring diagram.
In figure: 1, steel band; 2, copper shield; 3, heart yearn; A, B are respectively copper shield and the steel band exit of cable, receive the input end that the online real-time anti-theft of power cable cuts device.
Fig. 2 is that real-time anti-theft of the present invention cuts apparatus structure functional block diagram.
Fig. 3 is the test waveform figure that action of low-voltage pulse telemetry of the present invention obtains.In figure, S is and steals cutpoint to the distance of monitoring client.
Fig. 4 is a physical circuit schematic diagram of pulse ranging unit in Fig. 2.
Fig. 5 is a physical circuit schematic diagram of resistance measurement unit in Fig. 2.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, in one end of cable, copper shielding layer A and steel band B are separated, and be linked into multicircuit switch.Under normal circumstances, the resistance between cable copper shielding layer and steel band is below several ohm, and when having people to steal to cut cable, steel band and copper shield disconnect, and resistance measurement unit is that hundreds of is kilohm even infinitely great by measuring resistance between A, B; At this moment stealing/cutting prevention device can have been judged rapidly people and cut cable robber.
As shown in Figure 2, real-time anti-theft of the present invention cuts device and comprises a multicircuit switch, carries out the monitoring input of many power cables.CPU control module carries out timesharing loop test by controlling multicircuit switch.The input on each road all enters into function switch by multicircuit switch through passage I, function switch is not changed under normal circumstances, the resistance that CPU carries out each cable by resistance measurement unit is measured, when cable is cut, CPU controls function switch and is switched to pulse ranging unit, and send one 5 volts by the I/O mouth of CPU, width 0.1～1 μ s pulse signal is to pulse ranging unit, pulse ranging unit amplifies a 80-100 of generation by signal and lies prostrate, width is the low voltage pulse signal of 0.1-1 μ s, this signal is leaded up to function switch and is added between the copper shield and steel band of cable through passage II and multicircuit switch, another road enters into high-speed a/d converter and carries out analog to digital conversion.CPU obtains test data by high-speed a/d converter, and test data is shown by liquid crystal display after data processing.CPU sends warning message by short message alarm module simultaneously.
As shown in Figure 3, the method for action of low-voltage pulse range finding of the present invention is carried out according to the following steps:
At t1 constantly, one 5 volts of CPU generations, width 0.1～1 μ s pulse signal are to pulse ranging unit, and the high-speed a/d converter of CPU control simultaneously carries out analog to digital conversion.It is that 0.1～1 μ s low voltage pulse signal is added between the copper shield and steel band of cable by the function switch-passage II-multicircuit switch in Fig. 2 that pulse ranging unit amplifies generation 80-100 volt, a width by signal.Signal reaches while stealing cutpoint and produces reflected signal, and reflected signal enters high-speed a/d converter through passage II-pulse ranging unit again and carries out analog to digital conversion.Finally, high-speed a/d is processed the action of low-voltage pulse reflection configuration data that collect through CPU, the test waveform shown in logical display interface output map 3, and t1 is the pulse to cable of copper shield layer and steel band transmitting, the pulse signal that t2 is reflected back for stealing cutpoint, S is and steals cutpoint to the distance of control point.
As shown in Figure 4, action of low-voltage pulse generation circuit comprises two shaping pulse triode Q1, Q2, two pulse amplifying triode Q3, Q4 and the components and parts etc. of setovering.When CPU judgement cable is cut, export a positive pulse to the input end R2 in Fig. 4, pulse enters triode Q1 ground level after resistance R 2, pulse enters the ground level of triode Q2 after triode Q1 is anti-phase by capacitor C 3 and resistance R 4, triode Q2 again paired pulses carries out once by capacitor C 4 and resistance R 7, entering after anti-phase shaping the ground level of triode Q3, pulse enters the ground level of triode Q4 after triode Q3 amplification is anti-phase by capacitor C 5 and resistance R 9, triode Q4 again paired pulses carry out one anti-phase after, pulse by a 80～100V of capacitor C 6 outputs is added on the copper shield and steel band of cable through function switch and multicircuit switch by port 6.
As shown in Figure 5; resistance measuring circuit comprises a constant current source U1; two relay U2, U3; carry out the switching of different size of current, 3 precision resistor R1, R2, R3 that regulate size of current, two protective resistance R4, R6; the transient suppressor of a protection use; a measuring resistance R5, and two filter capacitor C7, C8, RX is measured resistance.When cable normal operation cuts without robber, resistance between copper shield and steel band is smaller, survey relay U3 action, constant current source output 1A electric current, when cable is cut, resistance between copper shield and steel band increases, now, CPU pilot relay U2 action automatically regulator potentiometer R2, R3, make constant current source export suitable electric current, by the voltage in testing standard resistance R 5, calculate the electric current flowing through really on RX, then test the voltage on RX, according to formula: R=U/I, can calculate the resistance of RX, i.e. resistance between copper shield and steel band.
Claims (2)
1. the online real-time anti-theft of power cable cuts a device, it is characterized in that, comprises a multicircuit switch, is connected and realizes multi-path monitoring input with the copper shield of many power cables with steel band, a CPU control module, carries out timesharing loop test by controlling multicircuit switch, the monitoring input of every power cable all enters into a function switch by multicircuit switch through passage I, CPU control module is measured the resistance of each cable by a resistance measurement unit, when cable is cut, CPU control module is controlled function switch and is switched to pulse ranging unit, and send one 5 volts by the I/O mouth of CPU control module, width is that the pulse signal of 0.1-1 μ s arrives pulse ranging unit, one 80 volts to 100 volts of pulse ranging unit outputs, width is the low voltage pulse signal of 0.1-1 μ s, the function switch of leading up to is added between the copper shield and steel band of cable through passage II and multicircuit switch, another road enters into a high-speed a/d converter and carries out analog to digital conversion, CPU control module obtains test data by high-speed a/d converter, shows after treatment by liquid crystal display, sends warning message by a short message alarm module simultaneously.
2. an online real-time anti-theft segmentation method for power cable, is characterized in that, adopts the online real-time anti-theft of power cable claimed in claim 1 to cut device, specifically comprises the steps:
The first step, one end at cable separates copper shielding layer A and steel band B, and be linked into multicircuit switch, under normal circumstances, resistance between cable copper shielding layer and steel band is below several ohm, when having people to steal to cut cable, steel band and copper shield disconnect, and resistance measurement unit is that hundreds of is kilohm even infinitely great by measuring resistance between A, B;
Second step, CPU control module is transformed into pulse ranging unit by function switch immediately, by one 80 volts to 100 volts of pulse ranging unit generations, width, it is the low voltage pulse signal of 0.1-1 μ s, the function switch of leading up to is added between the steel band and copper shield of cable through passage II and multicircuit switch, another road starts high-speed a/d converter and starts collecting test waveform, when pulse signal arrives cable outer layer cut-off point, just produce reflected impulse, high-speed a/d converter samples complete test waveform;
The 3rd step, high-speed a/d converter by the complete waveform data that collect after CPU control module is processed, by data processing and judge and steal cutpoint to the distance of cable control point, through the multi-functional output interface of CPU control module, export test waveform on liquid crystal display, start short message alarm module simultaneously and send alarming short message to cable management personnel, inform that being cut appears in which root cable and stolen cutpoint to the distance of control point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110455012.XA CN102540014B (en) | 2011-12-22 | 2011-12-22 | Online real-time anti-theft and anti-cut device and method for power cable |
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| CN201110455012.XA CN102540014B (en) | 2011-12-22 | 2011-12-22 | Online real-time anti-theft and anti-cut device and method for power cable |
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| CN102540014A CN102540014A (en) | 2012-07-04 |
| CN102540014B true CN102540014B (en) | 2014-07-16 |
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| CN201110455012.XA Expired - Fee Related CN102540014B (en) | 2011-12-22 | 2011-12-22 | Online real-time anti-theft and anti-cut device and method for power cable |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015008196A2 (en) | 2013-07-16 | 2015-01-22 | Batista Oliveira Costa Leal Miguel | System for operating and monitoring power cables |
| DE102013107819A1 (en) * | 2013-07-22 | 2015-01-22 | Ebm-Papst Mulfingen Gmbh & Co. Kg | "Circuit for thermal protection and power control of electric motors" |
| CN103592576B (en) * | 2013-10-24 | 2015-09-30 | 西安理工大学 | Based on anti-theft monitoring positioning system and the monitoring method of the power cable of GIS |
| CN103969550A (en) * | 2014-04-25 | 2014-08-06 | 西安电子科技大学 | On-line anti-theft alarm device for underground power cable |
| CN103985212A (en) * | 2014-05-09 | 2014-08-13 | 国家电网公司 | Anti-theft device for cable |
| CN104732688A (en) * | 2015-03-11 | 2015-06-24 | 国家电网公司 | Power cable tending and monitoring anti-theft alarming system and monitoring alarming method |
| CN105301408A (en) * | 2015-11-17 | 2016-02-03 | 中国神华能源股份有限公司 | Cable fault monitoring method, device and system |
| CN105334474A (en) * | 2015-11-30 | 2016-02-17 | 国网浙江省电力公司宁波供电公司 | Distributed on-line power supply monitoring system |
| CN105389923B (en) * | 2015-12-23 | 2017-12-05 | 长乐致远技术开发有限公司 | A kind of cable alarm |
| CN105590688A (en) * | 2015-12-30 | 2016-05-18 | 广安金侑达电业科技有限公司 | Cable with constant voltage power supply antitheft device |
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| CN200950159Y (en) * | 2006-09-25 | 2007-09-19 | 广州长正电子技术有限公司 | Anti-theft device for road lamp cable |
| CN101937600A (en) * | 2010-09-27 | 2011-01-05 | 山东省科学院海洋仪器仪表研究所 | Anti-theft alarm system for street lamp cable |
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| KR100282623B1 (en) * | 1998-05-12 | 2001-03-02 | 탁승호 | Value transfer and value storage method and value storage power meter using the same |
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| CN200950159Y (en) * | 2006-09-25 | 2007-09-19 | 广州长正电子技术有限公司 | Anti-theft device for road lamp cable |
| CN101937600A (en) * | 2010-09-27 | 2011-01-05 | 山东省科学院海洋仪器仪表研究所 | Anti-theft alarm system for street lamp cable |
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