CN106327769A - Cable antitheft device and cable antitheft method of wireless sensor network intelligent street lamp system - Google Patents
Cable antitheft device and cable antitheft method of wireless sensor network intelligent street lamp system Download PDFInfo
- Publication number
- CN106327769A CN106327769A CN201610705548.5A CN201610705548A CN106327769A CN 106327769 A CN106327769 A CN 106327769A CN 201610705548 A CN201610705548 A CN 201610705548A CN 106327769 A CN106327769 A CN 106327769A
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- Prior art keywords
- cable
- street
- lamp
- street lamp
- centralized controller
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/08—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using communication transmission lines
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
Abstract
The invention relates to the field of a street lamp antitheft detecting technology, and particularly to a cable antitheft device and a cable antitheft method of a wireless sensor network intelligent street lamp system. The cable antitheft device comprises a street lamp cable which is provided with a plurality of street lamp nodes. Each street lamp node is provided with a street lamp node controller. The street lamp cable is provided with a street lamp field centralized controller. The street lamp node controllers and the street lamp field centralized controller perform data exchange in a wireless communication manner. The street lamp field centralized controller is connected with a management center. The street lamp node controller is used for transmitting a first alarm signal to the street lamp field centralized controller on the condition that a cable lamp cable is electrified and no current information or voltage information is detected. The street lamp field centralized controller performs detection on the real-time length of the street lamp cable on the condition that the street lamp cable is not electrified, and compares the real-time length of the street lamp cable with a preset length for generating a second alarm signal on the condition that the real-time length is smaller than the preset length. The cable antitheft device and the cable antitheft method can perform antitheft monitoring on the street lamp cable in a relatively good manner.
Description
Technical field
The present invention relates to road lighting cable antitheft detection technique field, specifically, relate to a kind of wireless sense network intelligence road
The cable anti-theft device of lamp system and method.
Background technology
Applying of intelligent road lamp system is gradually increasing, and intelligent road lamp system possesses street-lamp node Control & data acquisition and leads to
The ability of letter, such that it is able to obtain voltage x current information, environmental information etc. on each street lamp information, line, wherein monitoring street lamp electricity
Cable situation, it is judged that the most stolen major function belonging to intelligent road lamp system of road lighting cable.Street-lamp node controls and communicates
The relatively conventional method of ability is power line carrier, PLC, relatively this technology, and sensor network technology has that transfer rate is very fast, net
The advantages such as network spatial extent is big, Internet mature and reliable, but realizing the aspect Shortcomings of cable theft-prevention function, this be because of
Being not power by day for road lighting cable, simple dependence Street lamps control node cannot judge that cable is the most stolen, it is contemplated that
A kind of a kind of complete street lamp electricity that road lighting cable carries out when can not power on cable the most by day simultaneously anti-thefting monitoring is proposed
Cable anti-theft technique.
Summary of the invention
The invention provides the cable anti-theft device of a kind of wireless sense network intelligent road lamp system, it can overcome existing skill
Certain or some defect of art.
The cable anti-theft device of the wireless sense network intelligent road lamp system according to the present invention, it includes being located at arbitrary street lamp joint
Street-lamp node controller at Dian, is provided with street lamp scene Centralized Controller at the road lighting cable at described arbitrary street-lamp node place,
Street lamp scene Centralized Controller and an administrative center connect；
Being provided with GPS unit in street-lamp node controller, GPS unit is for gathering the space bit confidence at corresponding street-lamp node
Cease and be sent to street lamp scene Centralized Controller；Street-lamp node controller is additionally operable to when road lighting cable has electricity on road lighting cable
Curtage information carry out periodically gathering, and when being not detected by curtage information to street lamp scene centralized Control
Device sends the first alarm signal；
Street lamp scene Centralized Controller includes that one or two pulse temporal sends detection module, memory element and centre
Reason device, memory element for storing the preseting length of road lighting cable, pulse temporal send detection module for road lighting cable without
During electricity, the real time length to road lighting cable detects, and central processing unit is used for the real time length to road lighting cable and preseting length
Compare and produce the second alarm signal when real time length is less than preseting length；
Street lamp scene Centralized Controller is additionally operable to the spatial positional information received and the first alarm signal and generation
The second alarm signal be sent to administrative center, administrative center includes electronic chart unit, and electronic chart unit is for according to connecing
The spatial positional information received carries out visualization display to the position of corresponding street-lamp node.
In the cable anti-theft device of the wireless sense network intelligent road lamp system of the present invention, when having electricity on street lamp cable, whole
Individual system is in running order, and street-lamp node controller periodically gathers the voltage and current information on cable, when finding cable
During upper current-voltage information disappearance, street-lamp node controller can be by the stolen warning message of wireless sense network inbound cable to road
Lamp scene Centralized Controller, this information is uploaded to administrative center, thus realizes cable theft-prevention function by on-the-spot Centralized Controller again,
The method combines the electronic chart of administrative center and the GPS information of street-lamp node, can accomplish being accurately positioned of stolen point.
In the cable anti-theft device of the wireless sense network intelligent road lamp system of the present invention, when road lighting cable unpowered by day
Time, by the current/voltage on monitoring cable, street-lamp node controller can not judge that cable is the most stolen, now on-the-spot concentration
Controller can be carried out contrast by the length of detection cable sentence by using the bounce technique of pulse temporal or point-to-point method
Power-off cable is the most stolen, if it is determined that stolen, then stolen information is uploaded to administrative center, thus realizes cable theft-prevention function；
The method is by calculating, it is also possible to be accurately positioned stolen point.
As preferably, pulse temporal send detection module include oscillating circuit, pulse shaping circuit, pulse amplifying circuit and
Signal amplification circuit, oscillating circuit, pulse shaping circuit, pulse amplifying circuit, road lighting cable and signal amplification circuit connect successively
Connect.Pulse temporal method (reflecting or point-to-point) is often used to do cable length detection, and cable is as electromagnetic medium, and pulse is at it
On with approximation the light velocity transmit, when impedance mismatch occurring in the terminal of cable, will be formed echo to initial transmissions point,
Initial transmissions end or terminal at cable set up signal amplification circuit, amplify the signal received, reach the width that can differentiate
Degree, by calculating the time difference launched with receive, calculates the length of cable, when count frequency reaches more than 100Mhz, surveys
Accuracy of measurement can reach 1 meter.The present invention is the expansive approach of this principle, realizes pulse temporal in the Centralized Controller of street lamp scene
Detection module, during onsite application, first carries out demarcating detection, detects length of cable, arteries and veins determined by when testing together with demarcation
Rush amplitude and width arranges stored along in the power-off non-volatile memory chip of street lamp scene Centralized Controller, then at street lamp
In the period of cable power-off, periodically detecting cable length, it is right that testing result and the demarcation detection data stored are carried out
Ratio, thus realize judgement stolen to cable under cable outage condition, note abnormalities and i.e. report to the police.
As preferably, street-lamp node controller and street lamp scene Centralized Controller are by GPRS mode or 3G mode number
According to alternately.
Present invention also offers a kind of cable theft-prevention method of wireless sense network intelligent road lamp system, it can overcome existing
Certain or some defect of technology.
The cable theft-prevention method of the wireless sense network intelligent road lamp system according to the present invention, comprising: at road lighting cable
Street lamp scene Centralized Controller is set, street-lamp node controller is set at arbitrary street-lamp node of road lighting cable；Save at street lamp
Arranging GPS unit in base site controller, GPS unit is for the spatial positional information gathered at corresponding street-lamp node and is sent to street lamp
On-the-spot Centralized Controller；One or two pulse temporal is set in the Centralized Controller of street lamp scene and sends detection module, storage
Unit and central processing unit, and at the preseting length of memory cell storage road lighting cable；
When road lighting cable has electricity, by street-lamp node controller, the curtage information on road lighting cable is carried out week
Phase property gathers, and sends the first alarm signal when being not detected by curtage information to street lamp scene Centralized Controller；
When road lighting cable is without electricity, makes pulse temporal send detection module and the real time length of road lighting cable detected,
Make central processing unit that the real time length of road lighting cable to be compared and when real time length is less than preseting length with preseting length
Produce the second alarm signal；
Make street lamp scene Centralized Controller by the spatial positional information received and the first alarm signal and the of generation
Two alarm signals are sent to an administrative center, and arrange an electronic chart unit at administrative center, make electronic chart unit root
According to the spatial positional information received, the position of corresponding street-lamp node is carried out visualized operation to show.
As preferably, send at pulse temporal and oscillating circuit, pulse shaping circuit, pulse amplifying electricity are set at detection module
Road and signal amplification circuit, and oscillating circuit, pulse shaping circuit, pulse amplifying circuit, road lighting cable and signal are amplified electricity
Road is sequentially connected with.
As preferably, street-lamp node controller is carried out by GPRS mode or 3G mode with street lamp scene Centralized Controller
Data interaction.
In the cable theft-prevention method of the wireless sense network intelligent road lamp system of the present invention, when street lamp cable is not powered, on road
When presenting open circuit between two inputs of Lantern Festival point, it is possible to use two pulse temporal to send detection module and use pulse temporal reflection
Method to measure the length of two cables respectively, the length that contrast initial alignment is measured such that it is able to realize cable power-off
Judge cable is the most stolen under situation；When presenting high-frequency resistance between two inputs of street-lamp node, enough use one
Pulse temporal sends detection module and uses the point-to-point measurement method of pulse temporal to measure the total length of two cables, contrasts initial alignment
The length measured such that it is able to realize judging cable is the most stolen under cable outage condition.
As preferably, pulse temporal send detection module include oscillating circuit, pulse shaping circuit, pulse amplifying circuit and
Signal amplification circuit, oscillating circuit, pulse shaping circuit, pulse amplifying circuit, road lighting cable and signal amplification circuit connect successively
Connect.
As preferably, street-lamp node controller and street lamp scene Centralized Controller are by GPRS mode or 3G mode number
According to alternately.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the cable anti-theft device of a kind of wireless sense network intelligent road lamp system in embodiment 1；
Fig. 2 is the schematic diagram of the street lamp scene Centralized Controller in embodiment 1；
Fig. 3 is the schematic diagram of the cable anti-theft device of a kind of wireless sense network intelligent road lamp system in embodiment 2；
Fig. 4 is the schematic diagram of the cable anti-theft device of the wireless sense network intelligent road lamp system in embodiment 3.
Detailed description of the invention
For further appreciating that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.It is to be understood that
, embodiment be only the present invention explained and and non-limiting.
Embodiment 1
As shown in Figure 1, 2, present embodiments provide the cable anti-theft device of a kind of wireless sense network intelligent road lamp system, its
Including the street-lamp node controller 330 being located at arbitrary street-lamp node 320, the street lamp electricity at described arbitrary street-lamp node 320 place
Being provided with street lamp scene Centralized Controller 340 at cable 310, street lamp scene Centralized Controller 340 is connected with an administrative center；
Being provided with GPS unit in street-lamp node controller 330, GPS unit is for gathering the space at corresponding street-lamp node 320
Positional information is also sent to street lamp scene Centralized Controller 340；Street-lamp node controller 330 is additionally operable to be had at road lighting cable 310
Carry out the curtage information on road lighting cable 310 during electricity periodically gathering, and be not detected by curtage information
Time send the first alarm signal to street lamp scene Centralized Controller 340；
Street lamp scene Centralized Controller 340 include one or two pulse temporal send detection module 350, memory element and
Central processing unit, memory element is for storing the preseting length of road lighting cable 310, and pulse temporal sends detection module 350 and is used for
Detecting the real time length of road lighting cable 310 when road lighting cable 310 is without electricity, central processing unit is for road lighting cable
The real time length of 310 and preseting length compare and produce the second alarm signal when real time length is less than preseting length；
Street lamp scene Centralized Controller 340 is additionally operable to the spatial positional information received and the first alarm signal and product
The second raw alarm signal is sent to administrative center, and administrative center includes electronic chart unit, and electronic chart unit is used for basis
The spatial positional information received carries out visualization display to the position of corresponding street-lamp node 320.
In the present embodiment, pulse temporal sends detection module 350 and includes oscillating circuit, pulse shaping circuit, pulse amplifying
Circuit and signal amplification circuit, oscillating circuit, pulse shaping circuit, pulse amplifying circuit, road lighting cable 310 and signal amplify electricity
Road is sequentially connected with.
In the present embodiment, street-lamp node controller 330 and street lamp scene Centralized Controller 340 are by GPRS mode or 3G side
Formula carries out data interaction.
In the present embodiment, it is also associated with at central processing unit first communicating for communicate with street-lamp node controller
Unit, and for the second communication unit communicated with administrative center.
In the present embodiment, street-lamp node controller and street lamp scene Centralized Controller carry out data by wireless communication unit
Alternately, the i.e. first communication unit is wireless communication unit.
Cable anti-theft device based on the wireless sense network intelligent road lamp system in the present embodiment, the present embodiment additionally provides
A kind of cable theft-prevention method of wireless sense network intelligent road lamp system, comprising: arrange street lamp scene collection at road lighting cable 310
Middle controller 340, arranges street-lamp node controller 330 at arbitrary street-lamp node 320 of road lighting cable 310；At street-lamp node
Arranging GPS unit in controller 330, GPS unit is for the spatial positional information gathered at corresponding street-lamp node 320 and is sent to
Street lamp scene Centralized Controller 340；One or two pulse temporal is set in street lamp scene Centralized Controller 340 and sends detection
Module 350, memory element and central processing unit, and at the preseting length of memory cell storage road lighting cable 310；
When road lighting cable 310 has electricity, by street-lamp node controller 330 to the curtage on road lighting cable 310
Information carries out periodically gathering, and sends the when being not detected by curtage information to street lamp scene Centralized Controller 340
One alarm signal；
When road lighting cable 310 is without electricity, pulse temporal is made to send the detection module 350 real time length to road lighting cable 310
Detect, make central processing unit that the real time length of road lighting cable 310 to be compared and little at real time length with preseting length
The second alarm signal is produced when preseting length；
Make street lamp scene Centralized Controller 340 by the spatial positional information received and the first alarm signal and generation
Second alarm signal is sent to an administrative center, and arranges an electronic chart unit at administrative center, makes electronic chart unit
According to the spatial positional information received, the position of corresponding street-lamp node 320 is carried out visualized operation to show.
In the said method of the present embodiment, send at pulse temporal and at detection module 350, oscillating circuit, pulse shaping are set
Circuit, pulse amplifying circuit and signal amplification circuit, and by oscillating circuit, pulse shaping circuit, pulse amplifying circuit, street lamp electricity
Cable 310 and signal amplification circuit are sequentially connected with.
In the said method of the present embodiment, street-lamp node controller 330 is passed through with street lamp scene Centralized Controller 340
GPRS mode or 3G mode carry out data interaction.
Embodiment 2
As it is shown on figure 3, the present embodiment also provides the cable anti-theft device of a kind of wireless sense network intelligent road lamp system, its
Difference with embodiment 1 is: in the present embodiment, when road lighting cable 310 is not powered, between two of street-lamp node 320 inputs in
Existing open-circuit characteristic, street lamp scene Centralized Controller 340 includes that two pulse temporal send detection module 350.
Embodiment 3
As shown in Figure 4, the present embodiment also provides the cable anti-theft device of a kind of wireless sense network intelligent road lamp system, its
It is with the difference of embodiment 2: when road lighting cable 310 is not powered, between two inputs of street-lamp node 320, presents high frequency resistance
Anti-, now street lamp scene Centralized Controller 340 includes that a pulse temporal sends detection module 350.
Embodiment 4
The present embodiment also provides the cable anti-theft device of a kind of wireless sense network intelligent road lamp system, itself and embodiment 2
Difference be: when road lighting cable 310 is not powered, between two of street-lamp node 320 inputs, present high frequency load characteristic, this
Time for ensureing accuracy of detection, need to disconnect the physical connection between street-lamp node 320 and road lighting cable 310；Therefore, at street-lamp node
One electronic controllable double-pole switch is set between 320 and road lighting cable 310, a contactless voltage is set at street-lamp node 320
Sensor；And make, control electronic controllable double-pole switch Guan Bi when voltage sensor senses to road lighting cable 310 is powered, instead
Then control electronic controllable double-pole switch disconnect.
Schematically being described the present invention and embodiment thereof above, this description does not has restricted, institute in accompanying drawing
Show is also one of embodiments of the present invention, and actual structure is not limited thereto.So, if the common skill of this area
Art personnel enlightened by it, in the case of without departing from the invention objective, designs and this technical scheme without creative
Similar frame mode and embodiment, all should belong to protection scope of the present invention.
Claims (6)
1. the cable anti-theft device of wireless sense network intelligent road lamp system, it is characterised in that: include being located at arbitrary street-lamp node
(320) the street-lamp node controller (330) at place, road lighting cable (310) place at described arbitrary street-lamp node (320) place is provided with road
Lamp scene Centralized Controller (340), street lamp scene Centralized Controller (340) is connected with an administrative center；
Street-lamp node controller is provided with GPS unit in (330), and GPS unit is used for gathering the space at corresponding street-lamp node (320) place
Positional information is also sent to street lamp scene Centralized Controller (340)；Street-lamp node controller (330) is additionally operable at road lighting cable
(310) carry out the curtage information on road lighting cable (310) when having an electricity periodically gathering, and be not detected by electric current or
The first alarm signal is sent to street lamp scene Centralized Controller (340) during information of voltage；
Street lamp scene Centralized Controller (340) include one or two pulse temporal send detection module (350), memory element and
Central processing unit, memory element is used for storing the preseting length of road lighting cable (310), and pulse temporal sends detection module (350)
For detecting the real time length of road lighting cable (310) when road lighting cable (310) is without electricity, central processing unit is used for satisfying the need
The real time length of lamp cable (310) and preseting length compare and produce the second warning when real time length is less than preseting length
Signal；
Street lamp scene Centralized Controller (340) is additionally operable to the spatial positional information received and the first alarm signal and generation
The second alarm signal be sent to administrative center, administrative center includes electronic chart unit, and electronic chart unit is for according to connecing
The spatial positional information received carries out visualization display to the position of corresponding street-lamp node (320).
The cable anti-theft device of wireless sense network intelligent road lamp system the most according to claim 1, it is characterised in that: pulse
Time domain sends detection module (350) and includes oscillating circuit, pulse shaping circuit, pulse amplifying circuit and signal amplification circuit, shakes
Swing circuit, pulse shaping circuit, pulse amplifying circuit, road lighting cable (310) and signal amplification circuit to be sequentially connected with.
The cable anti-theft device of wireless sense network intelligent road lamp system the most according to claim 1, it is characterised in that: street lamp
Node Controller (330) and street lamp scene Centralized Controller (340) carry out data interaction by GPRS mode or 3G mode.
4. the cable theft-prevention method of wireless sense network intelligent road lamp system, comprising: arrange street lamp at road lighting cable (310) place existing
Field Centralized Controller (340), arranges street-lamp node controller at arbitrary street-lamp node (320) place of road lighting cable (310)
(330)；Arranging GPS unit in street-lamp node controller (330), GPS unit is used for gathering corresponding street-lamp node (320) place
Spatial positional information is also sent to street lamp scene Centralized Controller (340)；One is arranged in street lamp scene Centralized Controller (340)
Individual or two pulse temporal send detection module (350), memory element and central processing unit, and store up street lamp in memory cell
The preseting length of cable (310)；
When road lighting cable (310) has electricity, by street-lamp node controller (330) to the electric current on road lighting cable (310) or electricity
Pressure information carries out periodically gathering, and sends out to street lamp scene Centralized Controller (340) when being not detected by curtage information
Send the first alarm signal；
When road lighting cable (310) is without electricity, pulse temporal is made to send the detection module (350) the real-time length to road lighting cable (310)
Degree detects, and makes central processing unit compare the real time length of road lighting cable (310) and the longest with preseting length
The second alarm signal is produced when degree is less than preseting length；
Make street lamp scene Centralized Controller (340) by the spatial positional information received and the first alarm signal and the of generation
Two alarm signals are sent to an administrative center, and arrange an electronic chart unit at administrative center, make electronic chart unit root
According to the spatial positional information received, the position of corresponding street-lamp node (320) is carried out visualized operation to show.
The cable theft-prevention method of wireless sense network intelligent road lamp system the most according to claim 4, it is characterised in that: at arteries and veins
Rush time domain transmission detection module (350) place and oscillating circuit, pulse shaping circuit, pulse amplifying circuit and signal amplification electricity are set
Road, and oscillating circuit, pulse shaping circuit, pulse amplifying circuit, road lighting cable (310) and signal amplification circuit are connected successively
Connect.
The cable theft-prevention method of wireless sense network intelligent road lamp system the most according to claim 4, it is characterised in that: by road
Lantern Festival base site controller (330) and street lamp scene Centralized Controller (340) carry out data interaction by GPRS mode or 3G mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610705548.5A CN106327769A (en) | 2016-08-22 | 2016-08-22 | Cable antitheft device and cable antitheft method of wireless sensor network intelligent street lamp system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610705548.5A CN106327769A (en) | 2016-08-22 | 2016-08-22 | Cable antitheft device and cable antitheft method of wireless sensor network intelligent street lamp system |
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| CN106327769A true CN106327769A (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610705548.5A Pending CN106327769A (en) | 2016-08-22 | 2016-08-22 | Cable antitheft device and cable antitheft method of wireless sensor network intelligent street lamp system |
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| CN (1) | CN106327769A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108845521A (en) * | 2018-06-15 | 2018-11-20 | 河北天防电子信息工程有限公司 | Closed-loop intelligent anti-theft Control management system |
| CN110047234A (en) * | 2019-05-07 | 2019-07-23 | 广东电网有限责任公司 | A kind of power cable burglary-resisting system and method |
| CN110366294A (en) * | 2019-07-19 | 2019-10-22 | 四川艾贝斯科技发展有限公司 | A kind of burglar alarm and fault monitoring method of road lamp system |
| CN110517430A (en) * | 2019-07-26 | 2019-11-29 | 安徽静深实业有限公司 | A kind of road lighting cable anti-thefting monitoring method |
| CN112616231A (en) * | 2020-12-17 | 2021-04-06 | 陈迎春 | Fault alarm method, detection alarm device and system for periodic power supply electric appliance |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108845521A (en) * | 2018-06-15 | 2018-11-20 | 河北天防电子信息工程有限公司 | Closed-loop intelligent anti-theft Control management system |
| CN110047234A (en) * | 2019-05-07 | 2019-07-23 | 广东电网有限责任公司 | A kind of power cable burglary-resisting system and method |
| CN110366294A (en) * | 2019-07-19 | 2019-10-22 | 四川艾贝斯科技发展有限公司 | A kind of burglar alarm and fault monitoring method of road lamp system |
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| CN112616231A (en) * | 2020-12-17 | 2021-04-06 | 陈迎春 | Fault alarm method, detection alarm device and system for periodic power supply electric appliance |
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Application publication date: 20170111 |
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