CN104732688A - Power cable tending and monitoring anti-theft alarming system and monitoring alarming method - Google Patents
Power cable tending and monitoring anti-theft alarming system and monitoring alarming method Download PDFInfo
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- CN104732688A CN104732688A CN201510107092.8A CN201510107092A CN104732688A CN 104732688 A CN104732688 A CN 104732688A CN 201510107092 A CN201510107092 A CN 201510107092A CN 104732688 A CN104732688 A CN 104732688A
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Abstract
The invention provides a power cable tending and monitoring anti-theft alarming system and monitoring alarming method. The system comprises an FPGA, a pulse generator, a direct current pulse drive generator, a reflected pulse detector, an audible and visual alarm device, a GSM module and an LCD display screen. The pulse generator generates a constant-speed pulse signal on a monitored cable, the length of the cable is worked out by detecting the waveform of the reflected pulse on the cable and the time difference between the reflected pulse and the transmitted pulse, if the cable length calculated through the FPGA is not the preset cable length value or the reflected wave changes, the audible and visual alarm device is controlled to give an alarm, and the GSM module texts messages about stealing of the cable to assigned mobile phones in a mass mode. Whether the cable is cut through stealing or damaged can be rapidly detected at one end of the cable through the system, implementation is convenient and easy, the detected signal waveform and the calculated related data are displayed on the LCD display screen, and the abnormal position can be visually observed.
Description
Technical field
The invention belongs to electric and electronic technical field, relate to a kind of power cable nurse monitoring guard against theft and alarm system and alarming method by monitoring.
Background technology
The fast development of current city power cable supply network, produces huge challenge to power department cable running safety, accident prevention.Power cable is because unit value amount is comparatively large, by cable duct wiring, be extensively distributed in the three large features such as relatively remote region, in recent years, some lawless persons are for obtaining unlawful advantage, evil backstage manipulator is stretched to power cable, bring to the productive life of broad masses of the people and have a strong impact on, national wealth is suffered massive losses.The monitoring of power cable multiloop off-duty cable and cable laying phase to patrol and examine nurse antitheft imperative.To destroy and theft cable generally all occurs in conduit line or not easily by the place discovered, lawless person is often when in the dead of night, and remote peaceful ground, raises cover plate and creep into cable duct, cut and steal power cable or cable of copper shield layer; Power cable at the phase of laying or multiloop off-duty cable for subsequent use owing to being in non-electriferous state, again and again stolen, even if having, patrol officer is around-the-clock to patrol and examine, and spends a large amount of manpowers, financial resources, also be difficult to prevent from being cut, cause huge property loss even serious accident.For singularity and the restriction of cycloid time of cable place to use, monitoring cable anti-theft device should be had simple to operate, the features such as installation period is short.
At present, cable anti-theft system device emerges in an endless stream, each have their own feature of implementation.But these different anti-theft devices have a common deficiency, that is exactly in use inconvenient, complicated operation.Secondly, some apparatus function is simple, such as can not realize the cable monitoring under non-power status.Moreover, be exactly that interface is friendly not, and alarm form is too single etc.These all cause cable theft-prevention not carry out well.
Existing several technical scheme itemizes as follows:
(1) based on the power cable burglary-resisting system of power line carrier: based on the concrete condition of power line communication channel characteristic and warning system, carrier communication is realized by spread-spectrum modulation and demodulation circuit.Guard against theft and alarm system is made up of report to the police main website and line sniffing terminal, warning main website judges whether to occur the abnormal information such as power cable is stolen according to the carrier communication success or failure of each line sniffing terminal or the terminal's status information data that receive, when abnormality occurs, warning main website called by GSM network and send short message distally duty room personnel transmit alert.
(2) burglar alarm power cable: be made up of the resistance of cable jacket, cable inner core, antitheft cable, fixed resistance value and inner antitheft cable; The novel cable of its inner subsidiary antitheft cable, and attached specialized newspaper alarm device, by adding two antitheft cables at cable inner core, and every certain length, connect the resistance of a fixed resistance value between two antitheft cables; Separately on device, print length mark; One end has special alarming device to be connected with the described anti-theft power cable of interpolation, and timing detects the resistance of whole described antitheft cable.The such as patented claim of application number CN201020586698.7.
(3) power cable anti-theft alarm device: comprise and be located at the power frequency generator of cable far-end, the receiving host machine of cable near-end, power frequency generator is made up of the autotransformer be attempted by power cable and power-switching circuit, oscillatory circuit and power frequency envelop generator, autotransformer and power-switching circuit provide oscillatory circuit and power frequency envelop generator working power, and the oscillator signal that oscillatory circuit produces is in power frequency envelop generator feed-in power cable; Receiving host machine is formed by connecting by signal deteching circuit, monostable circuit, alarm request counter, code translator and audio alert driving circuit successively, code translator exports road clearing control end to alarm request counter after time delay clear circuit, wherein monostable circuit is controlled by the biasing circuit of signal deteching circuit and autotransformer composition respectively, signal deteching circuit connects the power frequency component gathered in power cable by mutual inductor, the biasing circuit of autotransformer composition connects power cable through the relay normally closed contact be connected on power cable.The such as patented claim of application number CN200720006534.0.
(4) Capacitance detecting method.This method utilizes a pair vacant cable exactly, by terminal short circuit, top is connected to the multivibrator of alarm.Can make of 555 timers, when cable is normal, oscillator not starting of oscillation, when cable is stolen, vacant cable forms electric capacity, and oscillator vibrates.
(5) Current and voltage detecting method.The method as the term suggests be exactly according on cable whether charged come detection streamer have not stolen.
The main shortcoming of existing cable anti-theft device is exactly complicated operation.The guard against theft and alarm system of scheme (1) is made up of report to the police main website and line sniffing terminal, and warning main website judges whether to occur the abnormal information such as power cable is stolen according to the carrier communication success or failure of each line sniffing terminal or the terminal's status information data that receive.On practical operation, not only need main website is installed, but also want line sniffing terminal.Scheme (2) needs to change existing cable structure, carrys out computational length by the resistance value in the middle of the antitheft cable of interpolation, impracticable.
Summary of the invention
The object of the invention is to solve prior art defect, provide a kind of and implement simply, the monitoring guard against theft and alarm system of power cable nurse easily and alarming method by monitoring.
For achieving the above object, the present invention by the following technical solutions:
A kind of power cable nurse monitoring guard against theft and alarm system, comprises FPGA, pulse producer, DC pulse driving voltage generator, reflected impulse detecting device, audible-visual annunciator, gsm module and LCD display; Described pulse producer, DC pulse driving voltage generator, reflected impulse detecting device, audible-visual annunciator, gsm module and LCD display are connected with described FPGA and are controlled by FPGA; Described DC pulse driving voltage generator is connected with pulse producer, DC pulse driving voltage generator produces DC voltage and powers to pulse producer, pulse producer produces the pulse signal of constant speed on monitoring cable, reflected impulse detecting device detects the waveform and reflected impulse and exomonental mistiming of guarding reflected impulse on cable, by FPGA collection signal, calculate cable length, and the related data of generation is presented in LCD display; If the cable length that FPGA calculates is not presetting cable length value, or when reflection wave produces variation, audible-visual annunciator produces alarm, and gsm module is to the stolen message of the Mobile phone group of specifying generating cable.
Further, described DC pulse driving voltage generator is 150V DC voltage generator.
Further, described LCD display adopts 12 cun of 24 true color liquid crystal display touch screens.
A kind of power cable nurse monitoring anti-theft alarming method, on monitoring cable, the pulse signal of constant speed is produced by pulse producer, the waveform and reflected impulse and exomonental mistiming of guarding reflected impulse on cable is detected by reflected impulse detecting device, by FPGA collection signal, calculate cable length, if the cable length that FPGA calculates is not presetting cable length value, or reflection wave produces variation, then audible-visual annunciator produces alarm, and gsm module is to the stolen message of the Mobile phone group of specifying generating cable.
Further, if the reflected pulse waveform that reflected impulse detecting device detects is identical with transmitting pulse waveform polarity, represent that open circuit exception or terminals open circuit appear in monitoring cable; If reflected pulse waveform is contrary with transmitting pulse waveform polarity, represents that monitoring cable occurs that short circuit grounding is abnormal, by reflected impulse and exomonental mistiming, calculate the length of abnormal origination point range pulse generator, determine extremely position to occur.
The present invention is guarding by the pulse producer be connected with FPGA pulse signal cable producing constant speed, by the waveform of reflected impulse on reflected impulse detecting device detection streamer and reflected impulse and exomonental mistiming, by FPGA collection signal, calculate cable length, if the cable length that FPGA calculates is not presetting cable length value, or reflection wave produces variation, then control audible-visual annunciator and produce alarm, gsm module is to the stolen message of the Mobile phone group of specifying generating cable, can detect that whether cable is damaged by this system fast in one end of cable, implement convenient and simple, and the related data of detection signal waveform and calculating is presented in LCD display, out-of-the way position can be observed intuitively.
Further, described LCD display adopts 12 cun of 24 true color liquid crystal display touch screens, display screen namely can display according to also can as operation interface, friendly interface, it is convenient to control.
By alarming method by monitoring of the present invention, warning system is connected to one end of cable, can judges whether cable is damaged fast, if damage, FPGA controls audible-visual annunciator and produces alarm, and gsm module is to the stolen message of the Mobile phone group of specifying generating cable.
Further, by judging the polarity of wave of reflection wave and transmitted wave, the Exception Type of cable can be judged, by reflected impulse and exomonental mistiming, calculate the length of abnormal origination point range pulse generator, can determine extremely position to occur, note abnormalities scene fast, avoids producing larger loss.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of power cable of the present invention nurse monitoring guard against theft and alarm system;
Fig. 2 is the wave form analysis figure of cable exception in the present invention.
Embodiment
Describe the present invention below in conjunction with accompanying drawing:
As shown in Figure 1, system of the present invention comprises FPGA and is connected with described FPGA and the pulse producer controlled by it, DC pulse driving voltage generator, reflected impulse detecting device, audible-visual annunciator, gsm module and LCD display; The other end of described DC pulse driving voltage generator connects pulse producer; Described monitoring cable is connected with pulse producer and reflected impulse detecting device respectively.
Adopt FPGA technology to carry out centralized control to all parts, utilize the reflection feature of pulse signal on cable, just can carry out pulse signal loading in one end of cable and reflected signal is detected, and need not operating at two ends, namely simple to operate.And on the other hand, the present invention has reasonably used gsm communication system, just can notify in the mode of short message at once when cable is stolen, and can inform the concrete distance at the stolen place of cable.LCD display is carried out show the stolen details of cable, apply 12 cun of 24 true color liquid crystal display touch screens, make friendly interface, man-machine interaction is convenient.Adopt sound and light alarm, can tell that alert occurs on-the-spot operator on duty in time.GSM network SMS alarm can mass-send relevant responsible official.And carry out alert event record, in order to checking afterwards.
Technology most crucial in the present invention is the utilization of FPGA technology and SOPC technology, according to the functional module preset, designs corresponding hardware circuit.First, DC voltage is produced to supply pulse producer with FPGA control 150V DC voltage generator; Then, pulse producer produces the transponder pulse signal of constant speed on monitoring cable; The waveform of reflected impulse detecting device detection of reflected pulse and reflected impulse and exomonental mistiming, use FPGA to carry out collection signal, calculate the physical length of cable, and the related data of generation is presented in LCD display; If the cable length that FPGA calculates is not presetting length value, or when reflection wave produces mutation, audible-visual annunciator will produce alarm, and gsm module can to the stolen message of the Mobile phone group of specifying generating cable.
About the calculating of cable physical length.The general pulse signal loaded on cable can produce end reflection and short circuit abnormal reflection, but the waveform of these two kinds of reflection waves is different, and both waveforms distinguish whereby.Waveform needed for this is end reflection ripple, according to being carried in waveform speed v known on cable, and the reflected impulse that collects of FPGA and exomonental mistiming t, just can calculate the physical length of cable: S=vt/2,, the waveform detected is presented in LCD display intuitively meanwhile, facilitates user to observe, and there is the writing function of alert event, so that subsequent treatment.
Further, LCD display of the present invention adopts 12 cun of 24 true color liquid crystal display touch screens, makes friendly interface, and man-machine interaction is convenient.Adopt sound and light alarm, can tell that alert occurs on-the-spot operator on duty in time.GSM network SMS alarm can mass-send relevant responsible official.And carry out alert event record, in order to checking afterwards.
Ultimate principle of the present invention is low voltage pulse reflection method, is radar method again.This method is mainly used in the abnormality detection of cable, detects the anomaly source of the cable used.Found range by observation abnormity point reflected impulse and exomonental mistiming.Different exceptions has different reflection waves, and when transponder pulse is positive polarity, if reflected impulse is also positive pulse, expression is open circuit exception or terminals open circuit, and namely voltage can not be fed to the exception of the other end; If reflected impulse is negative pulse, be then that short circuit grounding is abnormal, representing the characteristic impedance of cable abnormity point insulation resistance lower than this cable, is even the exception of zero.
To the analysis of low voltage pulse reflection method waveform as shown in Figure 2.Action of low-voltage pulse echo method monitoring cable wave impedance changes and realizes the antitheft object of cable monitoring.That is: calculated the length of cable by monitoring cable total length reflected impulse signal, compare with check length, see if there is change, unchanged then cable security, changes, has exception.
As shown in Figure 2, anomaly analysis of the present invention is as follows:
In Fig. 2,1 is signal generator, and 2 is cable splice, and 3 is electric discontinuity of cable position, and 4 is cable termination, and 5 is cable location of short circuit.
1) end reflection wave form analysis.The t1 moment is transponder pulse, and the t2 moment is the joint reflected impulse of cable, and the t3 moment is total length reflection, and the t4 moment is the secondary reflection of total length reflection, and the distance corresponding to t1 to t3 or t3 to t4 is exactly the total length of cable.
2) open circuit abnormality test wave form analysis.The t1 moment is transponder pulse, and the t2 moment is joint reflected impulse, and the t3 moment is abnormal reflected impulse of opening a way, and the t4 moment is open circuit abnormity point secondary reflection.The distance of the abnormal distance of open circuit corresponding to t1 to t3 or t3 to t4.
3) low-resistance (short circuit) abnormality test wave form analysis.The t1 moment is transponder pulse, and the t2 moment is joint reflected impulse, and the t3 moment is the pulse of low-resistance abnormal reflection, and the t4 moment is end reflection, and the t5 moment is low-resistance abnormity point secondary reflection.The distance of abnormity point distance corresponding to t1 to t3 or t3 to t5.What the present invention mainly adopted is end reflection waveform and open circuit abnormality test waveform.
The present invention also has following characteristics:
(1) FPGA and field programmable gate array, it occurs as a kind of semi-custom circuit in special IC field, has both solved the deficiency of custom circuit, overcomes again the shortcoming that original programming device gate circuit number is limited.Programmable system on chip (SOPC) is a kind of special embedded system: first it is SOC (system on a chip) (SOC), is namely completed the main logic function of whole system by one single chip; Secondly, it is programmable system, has design flexibly, can reduce, extendible, scalable, and possesses the function of software and hardware in-system programmable components.This design is the application embedding IP kernel based on FPGA, and this SOPC system implants processor in advance exactly in FPGA, makes to be applied integrally to design.
(2) 150V DC voltage generator: refer to and be mainly used in the exomonental driving power of low-voltage direct.
(3) pulse producer: be used to the system that signal occurs, send DC pulse signal.
(4) reflected impulse monitoring: adopt the ADC with high frequency ability in sampling to realize the monitoring of transponder pulse and reflected impulse signal.
(5) gsm system: i.e. global system for mobile communications is current application mobile phone standard the most widely.For mass-sending alarming short message.
(6) LCD display: make friendly interface, produces monitoring analysis picture.
(7) sound and light alarm: send a kind of signalling alarm equipment of warning signal to people by sound and passage of scintillation light.
The foregoing is only embodiments of the invention, be not limited to the present invention.The present invention can have various suitable change and change.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a power cable nurse monitoring guard against theft and alarm system, is characterized in that: comprise FPGA, pulse producer, DC pulse driving voltage generator, reflected impulse detecting device, audible-visual annunciator, gsm module and LCD display; Described pulse producer, DC pulse driving voltage generator, reflected impulse detecting device, audible-visual annunciator, gsm module and LCD display are connected with described FPGA and are controlled by FPGA;
Described DC pulse driving voltage generator is connected with pulse producer, DC pulse driving voltage generator produces DC voltage and powers to pulse producer, pulse producer produces the pulse signal of constant speed on monitoring cable, reflected impulse detecting device detects the waveform and reflected impulse and exomonental mistiming of guarding reflected impulse on cable, by FPGA collection signal, calculate cable length, and the waveform of generation and related data are presented in LCD display; If the cable length that FPGA calculates is not presetting cable length value, or when reflection wave produces variation, audible-visual annunciator produces alarm, and gsm module is to the stolen message of the Mobile phone group of specifying generating cable.
2. power cable nurse monitoring guard against theft and alarm system according to claim 1, is characterized in that: described DC pulse driving voltage generator is 150V DC voltage generator.
3. power cable nurse monitoring guard against theft and alarm system according to claim 1, is characterized in that: described LCD display adopts 12 cun of 24 true color liquid crystal display touch screens.
4. the nurse of the power cable based on a claim 1 system monitoring anti-theft alarming method, it is characterized in that: the pulse signal being produced constant speed by pulse producer on monitoring cable, the waveform and reflected impulse and exomonental mistiming of guarding reflected impulse on cable is detected by reflected impulse detecting device, by FPGA collection signal, calculate cable length, if the cable length that FPGA calculates is not presetting cable length value, or reflection wave produces variation, then audible-visual annunciator produces alarm, gsm module is to the stolen message of the Mobile phone group of specifying generating cable.
5. power cable nurse monitoring anti-theft alarming method according to claim 4, is characterized in that: if the reflected pulse waveform that reflected impulse detecting device detects is identical with transmitting pulse waveform polarity, represents that open circuit exception or terminals open circuit appear in monitoring cable; If reflected pulse waveform is contrary with transmitting pulse waveform polarity, represents that monitoring cable occurs that short circuit grounding is abnormal, by reflected impulse and exomonental mistiming, calculate the length of abnormal origination point range pulse generator, determine extremely position to occur.
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| CN201510107092.8A CN104732688A (en) | 2015-03-11 | 2015-03-11 | Power cable tending and monitoring anti-theft alarming system and monitoring alarming method |
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Cited By (7)
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| CN105469522A (en) * | 2015-11-16 | 2016-04-06 | 国网重庆市电力公司电力科学研究院 | Cable antitheft method and device |
| CN105551160A (en) * | 2016-03-04 | 2016-05-04 | 北京云星宇科技服务有限公司 | Antitheft and alarm system of cable |
| CN105844830A (en) * | 2016-04-22 | 2016-08-10 | 杭州讯能科技有限公司 | Power cable anti-theft alarm system |
| CN106840075A (en) * | 2017-02-15 | 2017-06-13 | 苏州科宝光电科技有限公司 | Cable on-line detecting 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 |
| CN110895299A (en) * | 2018-09-12 | 2020-03-20 | 中国石油化工股份有限公司 | Power cable ranging identification method |
| CN111812449A (en) * | 2020-05-26 | 2020-10-23 | 广西电网有限责任公司电力科学研究院 | Power distribution network state estimation abnormity identification method |
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| CN110895299A (en) * | 2018-09-12 | 2020-03-20 | 中国石油化工股份有限公司 | Power cable ranging identification method |
| 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 |
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| CN111812449A (en) * | 2020-05-26 | 2020-10-23 | 广西电网有限责任公司电力科学研究院 | Power distribution network state estimation abnormity identification method |
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