CN205920572U - Early warning system is prevented destroying by power transmission line based on multi -sensor fusion technique - Google Patents
Early warning system is prevented destroying by power transmission line based on multi -sensor fusion technique Download PDFInfo
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- CN205920572U CN205920572U CN201620701536.0U CN201620701536U CN205920572U CN 205920572 U CN205920572 U CN 205920572U CN 201620701536 U CN201620701536 U CN 201620701536U CN 205920572 U CN205920572 U CN 205920572U
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Abstract
The utility model discloses an early warning system is prevented destroying by power transmission line based on multi -sensor fusion technique, belong to electric wire netting protection technical field, a laser detector and a shaft tower fixed connection and the horizontal laser beam adjacent shaft tower direction of orientation of launching cover transmission line, high pitch alarm and video monitor all with shaft tower fixed connection, the terminal surface equals transmission line's range line under the horizontal laser beam to ground or by the perpendicular distance of leap thing, the terminal surface flushes under horizontal range line pole up end and the horizontal laser beam, be provided with a set of vibration sensor along length direction on the horizontal range line pole, vibration sensor while and electrical unit and remote server connection. Laser detector and vibration sensor belong to passive protection, and horizontal range line pole itself belongs to the initiative protection, and dual -protection combines together, has reduced the destroyed probability of transmission line, can protect transmission line better.
Description
Technical field
This utility model belongs to electrical network protection technology field, is related to a kind of power transmission line based on multi-sensor fusion technology
Tamper-proof early warning system.
Background technology
Fast development with national economy and the continuous expansion of city size, transmission line of electricity is more and more intensive, runs ring
Border is increasingly sophisticated, numerous transmission lines of electricity across highway, railway, bridge, river, lake, also some transmission lines of electricity can pass through high mountain,
Groups of building etc., after transmission line of electricity puts into operation, if people, animal or other are spanned thing near to or in contact with transmission line of electricity, will
Cause a serious accident, therefore, transmission line of electricity is over the ground, should limit not less than certain safe distance to the vertical dimension being spanned thing
Away from.The safety of transmission line of electricity is increasingly subject to various constructions violating the regulations, the architecture against regulations, trees violating the regulations, floating thing and bird pest etc.
Serious threat.
Transmission line of electricity in all parts of the country is happened occasionally by external force malicious event, such as: construction site scene is just in power transmission line
Below road or near, construction appliance (the mainly tall and big construction machinery such as crane, excavator, concrete mixer truck) is in operating process
In, its tall ledge enters sometimes in the safe range line of transmission line of electricity and causes transmission line of electricity that it is discharged, or even touches extension
Lead to the generation of tripping operation, power outage to transmission line of electricity, there is very big potential safety hazard.Public in the high speed having transmission line of electricity to cross over
Lu Shang, because transmission line of electricity lacks warning mark, the driver of Overheight Vehicles cannot learn that the vehicle of oneself cannot here pass through, no
Can adopt remedial measures in time, lead to transmission line of electricity to be destroyed, also the passenger on vehicle and car can be caused different degrees of
Injury.In the same manner, on the rivers having transmission line of electricity to cross over, some large ships, the equipment such as dredger is in flood tide and non-loading thing
In the case of pass through below transmission line of electricity, its superelevation part will also result in the destruction of transmission line of electricity.
The danger that transmission line of electricity is potential, destroyed by external force runs to transmission line safety and brings serious threat, therefore, needs
Develop a kind of preventing damage to power transmission line caused by external force prior-warning device, critical circuits are carried out with comprehensive real-time monitoring, warns in time
Show the risky operation behavior of site operation personnel, vehicular traffic and ship.
Content of the invention
This utility model, in order to overcome the defect of prior art, devises a kind of transmission of electricity based on multi-sensor fusion technology
The tamper-proof early warning system of line, laser detector and vibrating sensor broadly fall into passive protection, and horizontal range line bar belongs to main in itself
Dynamic protection, double protection combines, and reduces the probability that transmission line of electricity is destroyed, can preferably protect transmission line of electricity.
The concrete technical scheme that this utility model is taken is: a kind of power transmission line based on multi-sensor fusion technology is prevented broken
Bad early warning system, on two neighboring shaft tower, system includes the information acquisition unit being connected with power subsystem to electric transmission line erection
And alarm unit, also include remote server, information acquisition unit and alarm unit are all by wireless network and remote server
Communication it is important to: described information acquisition unit includes laser detector and video monitor, also includes being arranged on transmission line of electricity
Lower section, the horizontal range line bar being erected on two neighboring shaft tower, alarm unit includes high pitch alarm and is arranged on transmission line of electricity
On audible-visual annunciator, laser detector is with the horizontal laser beam that a shaft tower is fixedly connected and launches towards adjacent shaft tower direction
And transmission line of electricity is covered, high pitch alarm is all fixedly connected with shaft tower with video monitor, and horizontal laser beam lower surface is to ground
Face or the vertical dimension being spanned thing are equal to the range line of transmission line of electricity, and horizontal range line bar upper surface is neat with horizontal laser beam lower surface
Flat, horizontal range line bar is provided with group of vibrating sensor along its length, vibrating sensor simultaneously with power subsystem and remotely
Server connects.
On described horizontal range line bar, coiling is provided with the LED lamp band being connected with power subsystem.
Described LED lamp band is red light bar.
Described information acquisition unit also includes the ultrasonic detector being suspended on transmission line of electricity.
Described ultrasonic detector includes being sleeved on transmission line of electricity, columnar metal shell, also includes being arranged on
Metal shell inside and the ultrasonic sensor modules, signal processing module and the remote communication module that are sequentially connected, telecommunication
Module is connected with remote server, and ultrasonic sensor modules include three ultrasonic sensors, circumferentially square on metal shell
To being equipped with three ultrasonic emitting holes, three ultrasonic sensors correspond and are installed on three ultrasonic emitting in the hole sides,
Warning hole is additionally provided with metal shell, audible-visual annunciator is installed on warning in the hole side.
Described power subsystem include being in turn connected to form the ct induction energy fetching coil of charging circuit, current rectifying and wave filtering circuit,
Take energy power conditioning circuitry, accumulator cell charging and discharging management circuit and accumulator, also include with accumulator cell charging and discharging management circuit even
Connect the voltage-stabilizing output circuit forming discharge circuit, voltage-stabilizing output circuit is connected with information acquisition unit and alarm unit simultaneously, ct
Induction energy fetching mounting coil, in transmission line of electricity periphery, is taken and can power conditioning circuitry be also connected with ct induction energy fetching coil.
Described accumulator is ultracapacitor or colloid battery.
Described wireless network is gsm network or 3g network.
Described system also includes the mobile terminal by wireless network and remote server communication.
Limit for height direction board is fixed with described shaft tower.
The beneficial effects of the utility model are: laser detector is capable of detecting when whether there are metallic objects near power transmission line
Road, it can be avoided that the impact damage to transmission line of electricity for the metallic objects.Horizontal range line bar can play warning function, as passerby or
When operator see horizontal range line bar, will give special heed to and take appropriate measures, it is to avoid encounter horizontal range line bar, thus
The effect of protection transmission line of electricity can be played.If passerby or workmen do not see that level limit encountered by horizontal range line bar
Away from bar, vibrating sensor will be signaled to remote server, so that high pitch alarm sends alarm signal, reminds passerby
Or dangerous objects are removed by workmen, reach the purpose away from alarm region for the dangerous objects, teleworker can pass through
The picture that video monitor is recorded or video view live concrete condition, can thoroughly be reduced to zero by detecting fault rate.Swash
Photo-detector and vibrating sensor broadly fall into passive protection, and horizontal range line bar belongs to active defense in itself, and double protection phase is tied
Close, reduce the probability that transmission line of electricity is destroyed, can preferably protect transmission line of electricity.
Brief description
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of ultrasonic detector in this utility model.
Fig. 3 is the operation principle schematic diagram of early warning system in this utility model.
Fig. 4 is the operation principle schematic diagram of power subsystem in this utility model.
In accompanying drawing, 1 represents transmission line of electricity, and 2 represent shaft tower, and 3 represent remote server, and 4 represent laser detector, 5 representatives
High pitch alarm, 6 represent video monitor, and 7 represent ultrasonic detector, and 701 represent metal shell, and 702 represent ultrasound wave passes
Sensor, 703 represent ultrasonic emitting hole, and 704 represent audible-visual annunciator, and 705 represent warning hole, and 8 represent laser beam, and 9 represent ct
Induction energy fetching coil, 10 represent current rectifying and wave filtering circuit, and 11 representatives take energy power conditioning circuitry, and 12 represent accumulator cell charging and discharging management
Circuit, 13 represent voltage-stabilizing output circuit, and 14 represent accumulator, and 15 represent mobile terminal, and 16 represent horizontal range line bar, and 17 representatives are shaken
Dynamic sensor, 18 represent LED lamp band.
Specific embodiment
With specific embodiment, this utility model is elaborated below in conjunction with the accompanying drawings:
Specific embodiment, as shown in Figure 1, Figure 2, Figure 3 and Figure 4, a kind of power transmission line based on multi-sensor fusion technology is prevented
Damage alarm system, transmission line of electricity 1 is erected on two neighboring shaft tower 2, and system includes the information gathering being connected with power subsystem
Unit and alarm unit, also include remote server 3, and information acquisition unit and alarm unit are all taken with long-range by wireless network
Business device 3 communicates, and wireless network is gsm network or 3g network.Information acquisition unit includes laser detector 4 and video monitor
6, also include the horizontal range line bar 16 being arranged on transmission line of electricity 1 lower section, being erected on two neighboring shaft tower 2, alarm unit includes
High pitch alarm 5 and be arranged on audible-visual annunciator 704 on transmission line of electricity 1, laser detector 4 is fixedly connected with a shaft tower 2
And the horizontal laser beam 8 launched covers towards adjacent shaft tower 2 direction and by transmission line of electricity 1, laser detector 4 is based on pulsed and swashs
Ligh-ranging, when there being metal object to swarm in the strong-electromagnetic field of transmission line of electricity 1 surrounding generation, the electromagnetic field around transmission line of electricity 1
Can change, the laser sensor circuit transmitting laser beam 8 in laser detector 4, and the change of this magnetic field intensity of sampling, detect
Change, realize to the detection of metal object and identification, its principle is the Doppler effect of laser, laser detector 4 will collect
Magnetic field intensity information sends to remote server 3 and is analyzed and determines whether swashing around metal object entrance transmission line of electricity 1
The search coverage that light beam 8 covers, if it has, then the high pitch alarm 5 in alarm unit carries out high pitch warning around shaft tower 2,
Audible-visual annunciator 704 carries out sound and flashing light alarm, the long service life of this kind of laser detector 4, consumption around transmission line of electricity 1
Electricity is little, and detection rate of failing to report is low, and the span scope that can detect reaches 500 meters about.
High pitch alarm 5 is all fixedly connected with shaft tower 2 with video monitor 6, and horizontal laser beam 8 lower surface is to ground or quilt
The vertical dimension crossing over thing is equal to the range line of transmission line of electricity 1, and horizontal range line bar 16 upper surface is neat with horizontal laser beam 8 lower surface
Flat, horizontal range line bar 16 is provided with group of vibrating sensor 17 along its length, vibrating sensor 17 simultaneously with power subsystem
Connect with remote server 3.Laser detector 4 belongs to passive protection, only when external object enters in the range of range line, just meeting
Cause alarm signal, and horizontal range line bar 16 inherently can play warning function, belongs to active defense, as passerby or operator
When member sees horizontal range line bar 16, will give special heed to and take appropriate measures, it is to avoid encounter horizontal range line bar 16, thus can
To play the effect of protection transmission line of electricity 1.If passerby or workmen do not see that level encountered by horizontal range line bar 16
Range line bar 16, the frequency of vibration of horizontal range line bar 16 changes, and vibrating sensor 17 is by the horizontal range line bar 16 monitoring
Frequency of vibration is sent to remote server 3, and when exceeding restriction scope, the high pitch alarm 5 in alarm unit is around shaft tower 2
Carry out high pitch warning, audible-visual annunciator 704 carries out sound and flashing light alarm around transmission line of electricity 1, structure is simple, protection effect
Good.
As to further improvement of the utility model, coiling on horizontal range line bar 16 is provided with and is connected with power subsystem
LED lamp band 18, the light that LED lamp band 18 sends, passerby or workmen can be reminded to notice the presence of horizontal range line bar 16, have
The effect touched probability arriving of reduction horizontal range line bar 16, thus reduce the number of times that transmission line of electricity 1 is destroyed.LED lamp band 18 is preferred
For red light bar, red light, either daytime or night are all more eye-catching.
As to further improvement of the utility model, information acquisition unit also includes being suspended on surpassing on transmission line of electricity 1
Acoustic detector 7, is capable of detecting when whether there is non-metal kind object near transmission line of electricity 1, it can be avoided that non-metal kind object pair
The impact damage of transmission line of electricity 1, ultrasonic detector 7 and laser detector 4 are complementary to one another, cooperate so that entering danger
The metallic objects in region and non-metal kind object can be detected out exhaustive, improve the accuracy rate of system detectio.
As to further improvement of the utility model, ultrasonic detector 7 includes being sleeved on transmission line of electricity 1, cylinder
The metal shell 701 of shape, also includes ultrasonic sensor modules, the signal being arranged on inside metal shell 701 and being sequentially connected
Processing module and remote communication module, columnar enclosure designs guarantee not affect the distribution of transmission line of electricity 1 surrounding high voltage electric field,
Also corona discharge will not be produced.Remote communication module is connected with remote server 3, ultrasonic sensor modules include three ultrasonic
Wave sensor 702, metal shell 701 is along the circumferential direction equipped with three ultrasonic emitting holes 703, three ultrasonic sensors
702 one-to-one corresponding are installed on inside three ultrasonic emitting holes 703, and metal shell 701 is additionally provided with warning hole 705, acousto-optic
Alarm 704 is installed on inside warning hole 705, and ultrasonic detector 7, with ultrasonic ranging as Cleaning Principle, continuously measures surrounding
To the distance of metal shell 701, strong antijamming capability, the angle between each two ultrasonic sensor 702 is all 120 ° to object,
Three ultrasonic sensors 702 can cover 360 ° of scopes around metal shell 701, once having object to metal shell 701
When distance is less than the distance value setting, audible-visual annunciator 704 will flash and audible ringing signal, but also can report this
Alarming information sends to remote server 3 reliability it is ensured that sampling when dangerous close.
As to further improvement of the utility model, power subsystem includes the ct sensing being in turn connected to form charging circuit
Taking energy coil 9, current rectifying and wave filtering circuit 10, take can power conditioning circuitry 11, accumulator cell charging and discharging management circuit 12 and accumulator 14,
Also include managing, with accumulator cell charging and discharging, the voltage-stabilizing output circuit 13 that circuit 12 is connected formation discharge circuit, be related in power subsystem
Each circuit all take existing circuit form, voltage-stabilizing output circuit 13 even with information acquisition unit and alarm unit simultaneously
Connect, ct induction energy fetching coil 9 is sleeved on transmission line of electricity 1 periphery, take and can power conditioning circuitry 11 also connect with ct induction energy fetching coil 9
Connect.Because on transmission line of electricity 1, size of current change amplitude greatly, directly supplies can ensure the stable work of early warning system well
Make, and indirect energy supply control circuit is complicated, battery frequent discharge and recharge poor reliability, therefore, this utility model is using sensing power taking
The mode combining with accumulator 14, accumulator 14 is ultracapacitor or colloid battery, when bus load current is enough,
Using the direct energy supply of electromagnetic induction, keep accumulator 14 fully charged, when the state such as electric current deficiency or power failure, using storage simultaneously
It is ensured that power subsystem is to the uninterrupted power supply loading based on battery 14 power supply.
This power subsystem has three kinds of states.1. the electric current very little on transmission line of electricity 1, is insufficient to allow in power subsystem
Circuit works, and power subsystem is in inactive state, not to load output voltage and power；2. on transmission line of electricity 1, electric current is enough
Greatly, or even very when big, now take can power conditioning circuitry 11 control take can power, after the full energy of accumulator storage, take
The power obtaining is equal with the power of load consumption, and the unnecessary energy of strict restriction enters circuit, protection circuit normal work；3. defeated
Electric current in electric line 1 can make load startup work, but when the energy obtaining is less than the power loading, circuit is in interrupted work
Make state；Power-supply circuit in this power subsystem takes energy with maximal efficiency, and charges for accumulator 14, in the full energy of accumulator 14 storage
Before amount, first not to load output voltage and power, after accumulator 14 storage full energy, then to load supplying, work as power subsystem
When being in non-opening, accumulator 14 can be powered to load it is ensured that power subsystem is to the uninterrupted power supply loading.
As to further improvement of the utility model, system also includes communicating with remote server 3 by wireless network
Mobile terminal 15, mobile terminal 15 be preferably mobile phone, teleworker can be to remote server 3 by mobile terminal 15
It is controlled whenever and wherever possible.
As to further improvement of the utility model, shaft tower 2 is fixed with limit for height direction board, in limit for height direction board subscript
The height of bright limit for height herein, can further function as warning function, belong to active defense.
This utility model is in the specific implementation: high pitch alarm 5 and video monitor 6 are all to be started by reporting to the police or far
Cheng Qidong, for saving power consumption, they all in holding state, encounter horizontal range line bar 16 or entrance when object has been detected at ordinary times
When in the range of the range line of transmission line of electricity 1, at least one of vibrating sensor 17 or laser detector 4 can be signaled to remotely
Server 3, remote server 3 starts high pitch alarm 5 and audible-visual annunciator 704 alert, starts video prison simultaneously
The photo of control device 6 floor or video, are then forwarded to remote server 3, for providing scene for teleworker
Image information, this video monitor 6 can also pass through remote server 3 remote activation, existing for remotely checking transmission line of electricity 1
The situation of field.Loudspeaker alarm selected by high pitch alarm 5, passes through because remote server 3 is also associated with remote terminal 15
Gsm/gprs is controlled, and therefore, this loudspeaker alarm can also directly be propagandaed directed to communicate by remote terminal 15, reminds existing
The related personnel of field notices that expelling effect for object in deathtrap can be more preferably away from transmission line of electricity 1.Laser detector 4
Broadly fall into passive protection with vibrating sensor 17, and horizontal range line bar 16 belongs to active defense in itself, double protection combines, fall
The probability that low transmission line of electricity 1 is destroyed, can preferably protect transmission line of electricity 1.
Claims (10)
1. the tamper-proof early warning system of a kind of power transmission line based on multi-sensor fusion technology, transmission line of electricity (1) is erected at adjacent two
On individual shaft tower (2), system includes information acquisition unit and the alarm unit being connected with power subsystem, also includes remote server
(3), information acquisition unit and alarm unit all by wireless network with remote server (3) communication it is characterised in that: described
Information acquisition unit includes laser detector (4) and video monitor (6), also includes being arranged on below transmission line of electricity (1), sets up
Horizontal range line bar (16) on two neighboring shaft tower (2), alarm unit includes high pitch alarm (5) and is arranged on transmission line of electricity
(1) audible-visual annunciator (704) on, the horizontal laser beam that laser detector (4) is fixedly connected and launches with a shaft tower (2)
(8) cover towards adjacent shaft tower (2) direction and by transmission line of electricity (1), high pitch alarm (5) and video monitor (6) all with bar
Tower (2) is fixedly connected, horizontal laser beam (8) lower surface to ground or be spanned the vertical dimension of thing and be equal to transmission line of electricity (1)
Range line, horizontal range line bar (16) upper surface is flushed with horizontal laser beam (8) lower surface, on horizontal range line bar (16) along its length
It is provided with one group of vibrating sensor (17), vibrating sensor (17) is connected with power subsystem and remote server (3) simultaneously.
2. the tamper-proof early warning system of a kind of power transmission line based on multi-sensor fusion technology according to claim 1, it is special
Levy and be: the upper coiling of described horizontal range line bar (16) is provided with the LED lamp band (18) being connected with power subsystem.
3. the tamper-proof early warning system of a kind of power transmission line based on multi-sensor fusion technology according to claim 2, it is special
Levy and be: described LED lamp band (18) is red light bar.
4. the tamper-proof early warning system of a kind of power transmission line based on multi-sensor fusion technology according to claim 1, it is special
Levy and be: described information acquisition unit also includes the ultrasonic detector (7) being suspended on transmission line of electricity (1).
5. the tamper-proof early warning system of a kind of power transmission line based on multi-sensor fusion technology according to claim 4, it is special
Levy and be: described ultrasonic detector (7) inclusion is sleeved on transmission line of electricity (1), columnar metal shell (701), also
Lead to including the ultrasonic sensor modules being arranged on inside metal shell (701) and being sequentially connected, signal processing module and remotely
Letter module, remote communication module is connected with remote server (3), and ultrasonic sensor modules include three ultrasonic sensors
(702), metal shell (701) is along the circumferential direction equipped with three ultrasonic emitting holes (703), three ultrasonic sensors
(702) correspond and be installed on inside three ultrasonic emitting holes (703), metal shell is additionally provided with warning hole on (701)
(705), audible-visual annunciator (704) is installed on inside warning hole (705).
6. the tamper-proof early warning system of a kind of power transmission line based on multi-sensor fusion technology according to claim 1, it is special
Levy and be: described power subsystem includes being in turn connected to form ct induction energy fetching coil (9) of charging circuit, current rectifying and wave filtering circuit
(10), take energy power conditioning circuitry (11), accumulator cell charging and discharging management circuit (12) and accumulator (14), also include and accumulator
Management of charging and discharging circuit (12) connect formed discharge circuit voltage-stabilizing output circuit (13), voltage-stabilizing output circuit (13) simultaneously with letter
Breath collecting unit and alarm unit connect, and ct induction energy fetching coil (9) is sleeved on transmission line of electricity (1) periphery, and taking can power adjustments
Circuit (11) is also connected with ct induction energy fetching coil (9).
7. the tamper-proof early warning system of a kind of power transmission line based on multi-sensor fusion technology according to claim 1, it is special
Levy and be: described accumulator (14) is ultracapacitor or colloid battery.
8. the tamper-proof early warning system of a kind of power transmission line based on multi-sensor fusion technology according to claim 1, it is special
Levy and be: described wireless network is gsm network or 3g network.
9. the tamper-proof early warning system of a kind of power transmission line based on multi-sensor fusion technology according to claim 1, it is special
Levy and be: described system also includes the mobile terminal (15) communicating by wireless network and remote server (3).
10. the tamper-proof early warning system of a kind of power transmission line based on multi-sensor fusion technology according to claim 1, it is special
Levy and be: on described shaft tower (2), be fixed with limit for height direction board.
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| CN201620701536.0U CN205920572U (en) | 2016-07-06 | 2016-07-06 | Early warning system is prevented destroying by power transmission line based on multi -sensor fusion technique |
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| CN201620701536.0U CN205920572U (en) | 2016-07-06 | 2016-07-06 | Early warning system is prevented destroying by power transmission line based on multi -sensor fusion technique |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106937088A (en) * | 2017-03-13 | 2017-07-07 | 沈阳工程学院 | 800kV DC power transmission line monitoring protection systems |
| CN107328463A (en) * | 2017-07-25 | 2017-11-07 | 中国电力科学研究院 | A kind of overhead transmission line contactless vibration measuring method at a distance |
| CN108062845A (en) * | 2017-12-19 | 2018-05-22 | 国家电网公司 | Line protection warning device |
-
2016
- 2016-07-06 CN CN201620701536.0U patent/CN205920572U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106937088A (en) * | 2017-03-13 | 2017-07-07 | 沈阳工程学院 | 800kV DC power transmission line monitoring protection systems |
| CN107328463A (en) * | 2017-07-25 | 2017-11-07 | 中国电力科学研究院 | A kind of overhead transmission line contactless vibration measuring method at a distance |
| CN108062845A (en) * | 2017-12-19 | 2018-05-22 | 国家电网公司 | Line protection warning device |
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Address after: Room 409, Huigu Pioneering Building, 333 Hongqiao Road, Xuhui District, Shanghai Co-patentee after: State Grid Corporation of China Patentee after: Shanghai Beiken Intelligent Technology Co., Ltd. Co-patentee after: STATE GRID JILIN ELECTRIC POWER COMPANY LIMITED BAISHAN POWER SUPPLY COMPANY Address before: Room 409, Huigu Pioneering Building, 333 Hongqiao Road, Xuhui District, Shanghai Co-patentee before: State Grid Corporation of China Patentee before: SHANGHAI BEIKEN ELECTROMECHANICAL TECHNOLOGY CO., LTD. Co-patentee before: STATE GRID JILIN ELECTRIC POWER COMPANY LIMITED BAISHAN POWER SUPPLY COMPANY |
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