CN102194295A - Theft-proof and external-damage-proof detection and location method for armored cable - Google Patents
Theft-proof and external-damage-proof detection and location method for armored cable Download PDFInfo
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- CN102194295A CN102194295A CN2010101173391A CN201010117339A CN102194295A CN 102194295 A CN102194295 A CN 102194295A CN 2010101173391 A CN2010101173391 A CN 2010101173391A CN 201010117339 A CN201010117339 A CN 201010117339A CN 102194295 A CN102194295 A CN 102194295A
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Abstract
The invention discloses a theft-proof and external-damage-proof detection and location method for an armored cable. An armored layer and a copper shielding layer of the armored cable are used as two electrode plates of a capacitor, and by detecting the capacity of the capacitor, whether the armored cable is stolen or damaged by an external force or not is judged and the damaged position is located. The method is characterized in that: the two ends of the armored layer and the shielding layer are grounded to form an intact closed loop, and even though one end of the armored layer is disconnected, the capacitor structure cannot be formed; when a certain point of the armored cable is armored or the shielding layer of the armored cable is damaged by the external force, the capacitor structure taking the armored layer and the copper shielding layer as the two electrode plates cannot be formed until one end of the armored layer is disconnected and the capacity of the capacitor is directly proportional to the distance from the damage point to the detection point, namely, after the armored layer is disconnected, the cable is determined to be intact if the capacity of the capacitor cannot be detected and determined to be damaged by the external force if the capacity of the capacitor is detected; and through the capacity of the capacitor, the position where the capacitor is stolen or damaged by the external force is located.
Description
Technical field
The present invention relates to electric power detection technique field, relate in particular to a kind of armored electric cable theft prevention, anti-outside destroy detection and location method and device, mainly be applicable to the location of antitheft, tamper-proof and the warning and the breakdown point of armoured power cable.
Background technology
In recent years, sheathed cable brings about great losses for commercial production and daily life because the malicious event that artificial pilferage activity and barbarous construction cause frequently takes place.Cable theft-prevention product in the market mainly divides five big classes: 1. whether manhole cover anti-theft, its ultimate principle are to have the people to enter conduit line by the well lid place by the monitoring of human body infrared probe is installed at conduit line well lid place, carry out cable anti-theft alarm.Shortcoming: can not report to the police when cable duct is stolen when the people who steals cable enters by digging out a tunnel; And the method is robber's conventional process.2. infrared acquisition or laser correlation, its ultimate principle are by installing infrared at conduit line or whether the monitoring of laser correlation has the people to enter conduit line by the well lid place, carrying out cable anti-theft alarm.Shortcoming: wrong report when other objects such as mouse shut out the light.More than the common drawback of two class detection methods: powerup issue is difficult to solve, and adopts powered battery later maintenance workload big; Many units are difficult to coordinate; The cost height; Install additional video camera since raceway groove too picture black be difficult to see clearly; Can not locate breakdown point.3. current-voltage transformer, its ultimate principle are by installing current-voltage transformer additional at cable core, change by detecting current/voltage, carrying out cable anti-theft alarm.Shortcoming: (2) cable of not reporting to the police when screen layer does not cut off heart yearn can't can not be located breakdown point by burglar alarm (3) under stand-by state when the robber shells (1); 4. power carrier, its ultimate principle are by in the cable core load signal, adopt Principle of Communication, carry out cable anti-theft alarm.Shortcoming: (1) when the robber shells do not report to the police when screen layer does not cut off heart yearn often report by mistake when (2) load current changes greatly (3) influence original cable insulation states (4) can not locate breakdown point.5. cable pipe, shortcoming: great in constructing amount, long in time limit, the cost height, later stage cable maintenance difficulty is big, can not locate breakdown point.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of armored electric cable theft prevention vandal-proof detection and location method, this method can in time be reported to the police and the location when the armouring (steel band) of sheathed cable layer or copper shield are destroyed.
Technical scheme of the present invention is: a kind of armored electric cable theft prevention is prevented outside destroy detection and location method, lay standard according to power cable, the necessary two-terminal-grounding of the armor of sheathed cable and metal screen layer, armor and external shielding layer just constitute the ground loop of a closure like this, wherein mainly to act on be to strengthen the cable compression and tensile strength to armor, screen layer its mainly to act on be that electromagnetic screen and uniform electric field distribute, this armored electric cable theft prevention is prevented outside destroy detection and location method, be to utilize the armor of sheathed cable and the electric capacity that copper shield constitutes as the electric capacity two-plate, judge that by the capacity that detects this electric capacity sheathed cable is whether stolen or suffer outside destroy, and its failure position is positioned.It is characterized in that: what be made of armor and screen layer two-terminal-grounding is complete closed-loop path, can not form capacitance structure even disconnect an end of armor; When sheathed cable point armouring or screen layer suffer outside destroy, disconnect and to form behind the end of armor, and capacitance is directly proportional with the distance of breakdown point to check point with armor and copper shield capacitance structure as two-plate.Both disconnected and do not detect electric capacity behind the armor and conclude that cable is intact, and measured electric capacity and conclude that cable suffers outside destroy, and can position stolen or outside destroy point by capacity.
The concrete steps of method are as follows:
1, cable theft-prevention detecting unit (11) is serially connected with in armor and earth point or the armor.
2, whether outside destroy or thievery taking place, judges according to following method:
What armor and screen layer two-terminal-grounding constituted is complete closed-loop path, can not form capacitance structure even disconnect an end of armor; When sheathed cable point armouring or screen layer suffer outside destroy, disconnect and to form behind the end of armor, and capacitance is directly proportional with the distance of breakdown point to check point with armor and copper shield capacitance structure as two-plate.Promptly disconnect and do not detect electric capacity behind the armor and conclude that cable is intact, measure electric capacity and conclude that cable suffers outside destroy, and can position stolen or outside destroy point by capacity.
Capacitance detects according to following method:
The capacitance that Fig. 3 implements the inventive method detects schematic diagram.
Vcc is the voltage stabilizing charging voltage;
V0 is the initial voltage value on the electric capacity;
V1 is the magnitude of voltage that electric capacity finally can be charged to or be put into;
Vt is the magnitude of voltage on the t moment electric capacity.Then,
Vt=V0+ (V1-V0) * [1-exp (t/RC)] or,
T=RC*Ln[(V1-V0)/(V1-Vt)] promptly,
C＝t/{R*Ln[(V1-V0)/(V1-Vt)]}
So, just can calculate the capacity of electric capacity as long as known V1 and R measure V0, Vt and t.
Realize the anti-theft and anti-damage of cable warning locating device of said method; be made up of cable theft-prevention detecting unit (11) and high voltage isolated power supply (12), wherein cable theft-prevention detecting unit (11) is made up of signals collecting and disposal system (5), program control voltage stabilizing charging circuit (7), voltage detecting circuit (6), single-pole double-throw (SPDT) D.C. contactor (8), contactor drive circuit (10), protected location (9), communication module (4).
Its course of work is that signals collecting and disposal system (5) are controlled single-pole double-throw (SPDT) D.C. contactor (8) alternately cable theft-prevention detecting unit output A end (13) and program control voltage stabilizing charging circuit (7) and cable theft-prevention detecting unit (11) output B end (18) connection at interval by contactor drive circuit (10).Behind cable theft-prevention detecting unit output A end (13) and program control voltage stabilizing charging circuit (7), signals collecting and disposal system (5) are opened program control voltage stabilizing charging circuit (7), voltage detecting circuit (6) is monitored output voltage, and signals collecting and disposal system (5) are carried out time synchronisation and magnitude of voltage is carried out analyzing and processing.The constant explanation of voltage does not form with armor (16) and copper shield (17) concludes that as the capacitance structure of two-plate detected cable is intact; Voltage has formed with armor (16) and copper shield (17) along charging curve rising explanation concludes that as the capacitance structure of two-plate detected cable suffers outside destroy, and signals collecting and disposal system (5) can position stolen or outside destroy point by capacity, and by communication module (4) warning message are sent on Surveillance center and the related personnel's mobile phone.
Among the present invention, the major function of protected location (9) is to provide passage for surge voltage and surge current, and then reaches the purpose of protection cable theft-prevention detecting unit (11).
Among the present invention, high voltage isolated power supply (12) mainly is the low pressure insulating power supply to be provided and to prevent that high pressure from pouring into low-voltage network for cable theft-prevention detecting unit (11).
Description of drawings
Fig. 1 implements the cable construction artwork of the inventive method.
Fig. 2 implements the apparatus structure synoptic diagram of the inventive method.
The capacitance that Fig. 3 implements the inventive method detects schematic diagram.
Embodiment
The explanation of mark among Fig. 1: the 1-oversheath, 2-armor near end, the 3-inner sheath, the 16-armor is far held.
The explanation of mark among Fig. 2: 2-armor near end, 4-communication module, 5-signals collecting and disposal system; the 6-voltage detecting circuit, the program control voltage stabilizing charging circuit of 7-, 8-single-pole double-throw (SPDT) D.C. contactor; the 9-protected location, 10-contactor drive circuit, 11-cable theft-prevention detecting unit; the 12-high voltage isolated power supply, 13-detecting unit output A end, 14-copper litz wire; the 15-copper litz wire; the 16-armor is far held, 17-copper shield, 18-detecting unit output B end.
The present invention is described in further detail below in conjunction with drawings and Examples.
According to shown in Figure 1 cable is carried out the following steps construction:
Mode one:
1. after determining the cable no-voltage,, select bigger location, conduit line gap to operate according to on-site actual situations.
2. divest cable armouring; Measure 250mm and divest oversheath (1), respectively will be apart from armor (2) armor (16) colligation of both sides oversheath gap 50mm, remove the interlude armor, with the section of staying armor hacking.
3. weld ground wire; With two 25mm
2Copper litz wire (14) copper litz wire (15) one ends use firing iron and armor (2) armor (16) to weld respectively, and solder joint is good.
4. copper litz wire (14) copper litz wire (15) insulation; With the J-20 para tape copper litz wire is wrapped up the 3-4 layer.
5. waterproof measure; Adopt water blocking tape that oversheath (1) gap is added 100mm and wrap up layer 2-3 with water blocking tape.6. copper litz wire (15) other end presses the 200A Electric nose to connect detecting unit output A end (13), and copper litz wire (14) other end presses the 200A connection terminal to connect detecting unit output B end (18).
Mode two:
Detecting unit output A end (13) passes through 25mm
2Copper litz wire (15) connects cable sheath, and detecting unit output B end (18) passes through 25mm
2Copper litz wire (14) connects earth point.
The present invention is described in further detail in conjunction with embodiment illustrated in fig. 2:
The PUB-220/12 type high voltage isolated power supply that high voltage isolated power supply (12) selects for use POP, Xi'an special power supply company limited to produce; The LM258 that voltage detecting circuit (6) selects for use U.S. BB company to produce; The LM7150 that program control voltage stabilizing charging circuit (7) selects for use TI company to produce; The army grade TD-2006C type communication module that communication module (4) selects for use western ADT communication company limited to produce.
Utilize device shown in Figure 2, signals collecting and disposal system (5) are controlled at interval single-pole double-throw (SPDT) D.C. contactor (8) alternately cable theft-prevention detecting unit output A end (13) and program control voltage stabilizing charging circuit (7) and cable theft-prevention detecting unit (11) output B end (18) connection by contactor drive circuit (10).Behind cable theft-prevention detecting unit output A end (13) and program control voltage stabilizing charging circuit (7), signals collecting and disposal system (5) are opened program control voltage stabilizing charging circuit (7), voltage detecting circuit (6) is monitored output voltage, and signals collecting and disposal system (5) are carried out time synchronisation and magnitude of voltage is carried out analyzing and processing.The constant explanation of voltage does not form with armor (16) and copper shield (17) concludes that as the capacitance structure of two-plate detected cable is intact; Voltage has formed with armor (16) and copper shield (17) along charging curve rising explanation concludes that as the capacitance structure of two-plate detected cable suffers outside destroy, and signals collecting and disposal system (5) can position stolen or outside destroy point by capacity, and by communication module (4) warning message are sent on Surveillance center and the related personnel's mobile phone.
Outside destroy or thievery are located implementation method according to capacitance:
Statistics existing cable each specification list bit length armature of cable layer of each producer and screen layer constitute the capability value of electric capacity, calculate first outside destroy or theft place position in proper order.Through a large amount of hanging net operations, the result shows that this method construction is simple, and cost is low, and is stable, can be reliable, there is not the wrong report phenomenon, and accurate positioning can well realize the purpose to the antitheft anti-outside destroy of cable.
Claims (1)
1. an armored electric cable theft prevention is prevented outside destroy detection and location method, be to utilize the armor of sheathed cable and the electric capacity that copper shield is formed as the electric capacity two-plate, judge that by the capacity that detects this electric capacity sheathed cable is whether stolen or suffer outside destroy, and its failure position is positioned.It is characterized in that: what be made of armor and screen layer two-terminal-grounding is complete closed-loop path, can not form capacitance structure even disconnect an end of armor; When sheathed cable point armouring or screen layer suffer outside destroy, disconnect and to form behind the end of armor, and capacitance is directly proportional with the distance of breakdown point to check point with armor and copper shield capacitance structure as two-plate.Promptly disconnect and do not detect electric capacity behind the armor and conclude that then cable is intact,, and can position stolen or outside destroy point by this capacitance if measuring electric capacity concludes that then cable suffers outside destroy.
The concrete steps of method are as follows:
1) detecting unit is serially connected with in armor and earth point or the armor;
2) disconnect armor and earth point at interval, carry out capacitance detecting;
3) whether theft or outside destroy taking place judges according to following method:
Do not detect electric capacity behind the disconnection armor and conclude that then cable is intact, measure electric capacity and conclude that then cable suffers outside destroy, and can position stolen or outside destroy point by this capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101173391A CN102194295A (en) | 2010-03-04 | 2010-03-04 | Theft-proof and external-damage-proof detection and location method for armored cable |
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| CN2010101173391A CN102194295A (en) | 2010-03-04 | 2010-03-04 | Theft-proof and external-damage-proof detection and location method for armored cable |
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| CN2010101173391A Pending CN102194295A (en) | 2010-03-04 | 2010-03-04 | Theft-proof and external-damage-proof detection and location method for armored cable |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104101788A (en) * | 2013-04-08 | 2014-10-15 | 鸿富锦精密工业（深圳）有限公司 | Electronic device |
| CN105021858A (en) * | 2015-07-16 | 2015-11-04 | 国家电网公司 | Anti-electricity theft system |
| CN109272683A (en) * | 2018-11-22 | 2019-01-25 | 国网宁夏电力有限公司宁东供电公司 | The antitheft single-ended monitoring device of the power cable that do not put into operation |
| CN115691015A (en) * | 2022-10-24 | 2023-02-03 | 佛山市新东方电子技术工程有限公司 | Capacitive anti-theft detection circuit and anti-theft and anti-robbery device |
Citations (3)
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| CN1564009A (en) * | 2004-03-22 | 2005-01-12 | 西安交通大学 | On-line detector for insulation of cross-linked polythylene power cable sheath |
| CN101446616A (en) * | 2008-02-29 | 2009-06-03 | 田振国 | Method for finding fault point of cable or pipeline and device thereof |
| CN101458858A (en) * | 2008-10-17 | 2009-06-17 | 深圳市康贝电子有限公司 | Detection method and apparatus for armored electric cable theft prevention |
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2010
- 2010-03-04 CN CN2010101173391A patent/CN102194295A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564009A (en) * | 2004-03-22 | 2005-01-12 | 西安交通大学 | On-line detector for insulation of cross-linked polythylene power cable sheath |
| CN101446616A (en) * | 2008-02-29 | 2009-06-03 | 田振国 | Method for finding fault point of cable or pipeline and device thereof |
| CN101458858A (en) * | 2008-10-17 | 2009-06-17 | 深圳市康贝电子有限公司 | Detection method and apparatus for armored electric cable theft prevention |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101788A (en) * | 2013-04-08 | 2014-10-15 | 鸿富锦精密工业（深圳）有限公司 | Electronic device |
| CN104101788B (en) * | 2013-04-08 | 2017-02-01 | 鸿富锦精密工业（深圳）有限公司 | Electronic device |
| 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 |
| CN105021858A (en) * | 2015-07-16 | 2015-11-04 | 国家电网公司 | Anti-electricity theft system |
| CN105021858B (en) * | 2015-07-16 | 2019-05-10 | 国家电网公司 | Antitheft electric system |
| CN109272683A (en) * | 2018-11-22 | 2019-01-25 | 国网宁夏电力有限公司宁东供电公司 | The antitheft single-ended monitoring device of the power cable that do not put into operation |
| CN109272683B (en) * | 2018-11-22 | 2024-03-22 | 国网宁夏电力有限公司宁东供电公司 | Anti-theft single-end monitoring device for power cable without operation |
| CN115691015A (en) * | 2022-10-24 | 2023-02-03 | 佛山市新东方电子技术工程有限公司 | Capacitive anti-theft detection circuit and anti-theft and anti-robbery device |
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Application publication date: 20110921 |