CN109546751A - Power transmission line intelligent inspection tour system - Google Patents

Power transmission line intelligent inspection tour system Download PDF

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Publication number
CN109546751A
CN109546751A CN201811546639.4A CN201811546639A CN109546751A CN 109546751 A CN109546751 A CN 109546751A CN 201811546639 A CN201811546639 A CN 201811546639A CN 109546751 A CN109546751 A CN 109546751A
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CN
China
Prior art keywords
wireless communication
capacitor
feet
transmission line
communication module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811546639.4A
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Chinese (zh)
Inventor
杨志勇
樊瑞明
白雪琴
高建国
王亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Shuozhou Power Supply Co of State Grid Shanxi Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Shuozhou Power Supply Co of State Grid Shanxi Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Shuozhou Power Supply Co of State Grid Shanxi Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201811546639.4A priority Critical patent/CN109546751A/en
Publication of CN109546751A publication Critical patent/CN109546751A/en
Pending legal-status Critical Current

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Classifications

    • H02J13/0075
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/18Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)

Abstract

Power transmission line intelligent inspection tour system of the present invention belongs to power transmission line intelligent inspection tour system technical field;Technical problem to be solved are as follows: a kind of power transmission line intelligent inspection tour system is provided;Solve the technical solution of technical problem use are as follows: including transmission line of electricity monitoring device, the transmission line of electricity monitoring device is mounted at the top of wire pole tower, transmission line of electricity monitoring device periphery is provided with corresponding transmission line of electricity monitoring module, it include: the video camera being arranged on wire pole tower adjutage, the temperature sensor that wire pole tower sets up cable surface is set, the shaft tower angular transducer of wire pole tower bottom is set;The transmission line of electricity monitoring device is internally provided with central controller, and the central controller is connected with video camera, temperature sensor, shaft tower angular transducer respectively by conducting wire;The present invention is applied to transmission line of electricity and monitors place.

Description

Power transmission line intelligent inspection tour system
Technical field
Power transmission line intelligent inspection tour system of the present invention belongs to power transmission line intelligent inspection tour system technical field.
Background technique
The particularity in geographical location and environmental condition as locating for transmission line of electricity: shaft tower point is more, wide, wire length, route are walked Corridor environment is complicated, is exposed to the factors such as field throughout the year, in addition to will be other than the invasion by severe natural weather, the external force of human factor It is also in rising trend to destroy caused line tripping, the probability of forced line outage accident;Therefore how to route peripheral ring The case where border, the operation conditions of route and steel tower, carries out continual monitoring, understands the operating condition of transmission line of electricity in advance, reduces Failure rate shortens fault time, improves Supply Security and reliability, it has also become line management and maintenance unit are urgently to be solved Problem.
With the fast development of the technologies such as computer, communication and sensor, domestic and international scientific research institution, enterprise are transmitting electricity Route intelligent patrol technical aspect has carried out a large amount of research and practice, such as: power transmission line video monitoring system, transmission line of electricity Conducting wire thermometric on-line monitoring system, transmission tower inclination monitoring system, transmission line of electricity external force damage prevention on-line monitoring system etc.;But it is existing There is product to be only capable of being monitored simple target, handles and concentrate analysis while being unable to satisfy plurality of target, cause current Inspection tour system practicability and functionality are difficult to meet the requirement of Maintenance of Electric Transmission Line.
Summary of the invention
The present invention is in order to overcome problems of the prior art, technical problem to be solved are as follows: provides a kind of transmission of electricity Route intelligent patrol system;In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows: power transmission line intelligent is maked an inspection tour System, including transmission line of electricity monitoring device, the transmission line of electricity monitoring device are mounted at the top of wire pole tower, the transmission line of electricity Monitoring device periphery is provided with corresponding transmission line of electricity monitoring module, comprising: the video being arranged on wire pole tower adjutage is taken the photograph As head, the temperature sensor that wire pole tower sets up cable surface is set, the shaft tower angle sensor of wire pole tower bottom is set Device;The transmission line of electricity monitoring device is internally provided with central controller, the central controller by conducting wire respectively with view Frequency camera, temperature sensor, shaft tower angular transducer are connected;
The central controller is also connected with data memory module, sound and light alarm module by conducting wire;
The signal output end of the central controller is also connected with wireless communication module, and the wireless communication module passes through wireless network Network and monitor terminal, monitoring center computer;
The power input of the central controller is connected with power module.
The chip that the wireless communication module uses is wireless communication chips U1, the circuit structure of the wireless communication module Are as follows:
1 foot, 2 feet, 3 feet, 4 feet, 5 feet of the wireless communication chips U1 are connected with the signal output end of central controller;
7 feet of the wireless communication chips U1 connect 3.3V input power;
9 feet of the wireless communication chips U1 and the one end for meeting crystal oscillator X1 are connected behind one end of resistance R5 with one end of capacitor C9, The other end of the capacitor C9 is grounded;
10 feet of the wireless communication chips U1 and the other end for meeting crystal oscillator X1, after the other end of resistance R5 with capacitor C10 one End is connected, the other end ground connection of the capacitor C10;
One end of 11 feet of the wireless communication module U1 successively shunt-wound capacitance C11, behind one end of capacitor C12 with inductance L3 one End is connected, the other end ground connection of described capacitor C11, C12;
12 feet of the wireless communication module U1 and the one end for meeting inductance L2, the other end behind one end of capacitor C15 with inductance L3 It is connected, the other end ground connection of the capacitor C15;
13 feet of the wireless communication module U1 and the other end for meeting inductance L2, one end behind one end of capacitor C14 with inductance L1 It is connected, the other end of the inductance L1 is connected with one end of capacitor C5, one end of the other end shunt-wound capacitance C6 of the capacitor C5 It is followed by communication antenna E1, the other end ground connection of described capacitor C14, C6;
14 feet of the wireless communication module U1 are grounded;
15 feet of the wireless communication module U1 and 18 feet for meeting wireless communication module U1, one end of capacitor C3, the one of capacitor C2 End is followed by 3.3V input power, the other end ground connection of described capacitor C3, C2;
16 feet of the wireless communication module U1 are connected with one end of resistance R2;
It is grounded after 17 feet of the wireless communication module U1 and the other end of connecting resistance R2;
19 feet of the wireless communication module U1 are connected with one end of capacitor C4;
It is grounded after the other end of the 20 foot shunt-wound capacitance C4 of the wireless communication module U1.
The chip that the power module uses is voltage-stablizer U2 and voltage-stablizer U3, the circuit structure of the power module are as follows:
One end of the 1 foot shunt-wound capacitance C21 of the voltage-stablizer U2 is followed by 12V input power, and 2 feet of the voltage-stablizer U2 simultaneously connect electricity The one end for holding C22, has the anode of electrode capacitance C23 to be followed by 5V power output end, the 3 foot shunt-wound capacitance C21's of the voltage-stablizer U2 The other end, the other end of capacitor C22 are grounded after the cathode for having electrode capacitance C23;
One end of the 3 foot shunt-wound capacitance C24 of the voltage-stablizer U3 is followed by 5V input power, and 2 feet of the voltage-stablizer U3 simultaneously connect electricity Hold one end of C25, one end of capacitor C26 is followed by 3.3V power output end, and the 1 foot shunt-wound capacitance C24's of the voltage-stablizer U3 is another One end, the other end of capacitor C25 are grounded after the other end of capacitor C26.
The model 78L05 of the model NRF24L01, the voltage-stablizer U2 of the wireless communication chips U1, the pressure stabilizing The model SPX1117 of device U3.
What the present invention had compared with prior art has the beneficial effect that transmission line of electricity various dimensions provided by the invention intelligently patrol Viewing system may be implemented the temperature measurement to conducting wire multinode, capture to route ambient enviroment picture and shaft tower environment picture be grabbed It claps, invades burst the parameters such as link and alarm and synchronize monitoring, realize the overall monitor of the high-incidence fault target of transmission line of electricity, Enable operation maintenance personnel to understand the actual operating state of route in time, and corresponding failure can be prejudged, is had Effect reduces the intensity and cost of failure inspection work, shortens the malfunction elimination time, while effectively improving power supply reliability, The reduction of high degree is because of economic loss direct or indirect brought by failure power outage.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawing:
Fig. 1 is electrical block diagram of the invention;
Fig. 2 is the circuit diagram of wireless communication module of the present invention;
Fig. 3 is the circuit diagram of power module of the present invention;
In figure: 1 being transmission line of electricity monitoring device, 2 be video camera, 3 be temperature sensor, 4 be shaft tower angular transducer, 5 It is data memory module for central controller, 6,7 be sound and light alarm module, 8 be wireless communication module, 9 be monitor terminal, 10 is Monitoring center computer, 11 are power module.
Specific embodiment
As shown in Figure 1 to Figure 3, power transmission line intelligent inspection tour system of the present invention, including transmission line of electricity monitoring device 1, it is described Transmission line of electricity monitoring device 1 is mounted at the top of wire pole tower, and 1 periphery of transmission line of electricity monitoring device is provided with corresponding transmission of electricity Circuit monitoring module, comprising: the video camera 2 on wire pole tower adjutage is set, and setting sets up cable in wire pole tower The shaft tower angular transducer 4 of wire pole tower bottom is arranged in the temperature sensor 3 on surface;The transmission line of electricity monitoring device 1 Be internally provided with central controller 5, the central controller 5 by conducting wire respectively with video camera 2, temperature sensor 3, bar Tower angular transducer 4 is connected;
The central controller 5 is also connected with data memory module 6, sound and light alarm module 7 by conducting wire;
The signal output end of the central controller 5 is also connected with wireless communication module 8, and the wireless communication module 8 passes through nothing Gauze network and monitor terminal 9, monitoring center computer 10;
The power input of the central controller 5 is connected with power module 11.
The chip that the wireless communication module 8 uses is wireless communication chips U1, the circuit knot of the wireless communication module 8 Structure are as follows:
1 foot, 2 feet, 3 feet, 4 feet, 5 feet of the wireless communication chips U1 are connected with the signal output end of central controller 5;
7 feet of the wireless communication chips U1 connect 3.3V input power;
9 feet of the wireless communication chips U1 and the one end for meeting crystal oscillator X1 are connected behind one end of resistance R5 with one end of capacitor C9, The other end of the capacitor C9 is grounded;
10 feet of the wireless communication chips U1 and the other end for meeting crystal oscillator X1, after the other end of resistance R5 with capacitor C10 one End is connected, the other end ground connection of the capacitor C10;
One end of 11 feet of the wireless communication module U1 successively shunt-wound capacitance C11, behind one end of capacitor C12 with inductance L3 one End is connected, the other end ground connection of described capacitor C11, C12;
12 feet of the wireless communication module U1 and the one end for meeting inductance L2, the other end behind one end of capacitor C15 with inductance L3 It is connected, the other end ground connection of the capacitor C15;
13 feet of the wireless communication module U1 and the other end for meeting inductance L2, one end behind one end of capacitor C14 with inductance L1 It is connected, the other end of the inductance L1 is connected with one end of capacitor C5, one end of the other end shunt-wound capacitance C6 of the capacitor C5 It is followed by communication antenna E1, the other end ground connection of described capacitor C14, C6;
14 feet of the wireless communication module U1 are grounded;
15 feet of the wireless communication module U1 and 18 feet for meeting wireless communication module U1, one end of capacitor C3, the one of capacitor C2 End is followed by 3.3V input power, the other end ground connection of described capacitor C3, C2;
16 feet of the wireless communication module U1 are connected with one end of resistance R2;
It is grounded after 17 feet of the wireless communication module U1 and the other end of connecting resistance R2;
19 feet of the wireless communication module U1 are connected with one end of capacitor C4;
It is grounded after the other end of the 20 foot shunt-wound capacitance C4 of the wireless communication module U1.
The chip that the power module 11 uses is voltage-stablizer U2 and voltage-stablizer U3, the circuit structure of the power module 11 Are as follows:
One end of the 1 foot shunt-wound capacitance C21 of the voltage-stablizer U2 is followed by 12V input power, and 2 feet of the voltage-stablizer U2 simultaneously connect electricity The one end for holding C22, has the anode of electrode capacitance C23 to be followed by 5V power output end, the 3 foot shunt-wound capacitance C21's of the voltage-stablizer U2 The other end, the other end of capacitor C22 are grounded after the cathode for having electrode capacitance C23;
One end of the 3 foot shunt-wound capacitance C24 of the voltage-stablizer U3 is followed by 5V input power, and 2 feet of the voltage-stablizer U3 simultaneously connect electricity Hold one end of C25, one end of capacitor C26 is followed by 3.3V power output end, and the 1 foot shunt-wound capacitance C24's of the voltage-stablizer U3 is another One end, the other end of capacitor C25 are grounded after the other end of capacitor C26.
The model 78L05 of the model NRF24L01, the voltage-stablizer U2 of the wireless communication chips U1, the pressure stabilizing The model SPX1117 of device U3.
The present invention is mainly by being arranged intelligent patrol terminal monitoring controller and long-range master station system structure on utility poles At, by the installation transmission line of electricity monitoring device on transmission tower, realize the multi-C stereo overall monitor to power transmission line corridor, Transmission line of electricity monitoring device uses multiple-sensor integration technology, can survey to the temperature of cable guide multiposition multinode Amount captures shaft tower route ambient enviroment picture and shaft tower environment picture, and to shaft tower tilt parameters, burst invasion interlink warning Etc. parameters synchronize monitoring, data will be acquired by remote radio communication network and be sent to corresponding monitoring computer or monitoring Terminal.
The monitoring center computer can quick and precisely analyze the actual motion of current line by daemon software system Situation gives warning in advance to corresponding failure, while the system also supports web access, short message or wechat push alarm, so that operation Maintenance personnel can understand the actual operating state of route in time, and can prejudge to corresponding failure, effectively mitigate event Barrier inspection working strength, shortens the malfunction elimination time.
The transmission line of electricity monitoring device is circumscribed with video camera, temperature sensor, shaft tower angular transducer, collects data It acquires, handle, be in communication in one, the multi-C stereo overall monitor to power transmission line corridor may be implemented;
The wireless communication module at work, the real time temperature measurement number of temperature measurement module is received by the wireless radio frequency modules of 433MHZ Protocol processes are carried out to all data according to, central controller, standard agreement as requested by wireless communication module by data On be sent to main website platform software, platform software carries out warning reminding by Data Management Analysis, to data exception information, assists fortune Dimension personnel prejudge route actual conditions.
Transmission line of electricity monitoring device is used for the long-range tour inspection of transmission line of electricity, transmission tower and passway for transmitting electricity, and device is adopted With modularized design, complying with standard, opening, miniaturization, low-power consumption, design requirement easy to install, software design has can Scalability;Transmission line of electricity monitoring device is by image/video shooting module, conducting wire temperature measurement module, sound and light alarm module, intrusion detection Module, shaft tower tilt module, power supply system, human-computer interactive control module and communication module composition, multiple monitoring sensing modules are total With a set of power supply system, control module, communication module.
Transmission line of electricity monitoring device is integrated using multi-sensor information and the synchronized sampling and synthesis of many reference amounts monitoring information Analytical technology is realized and carries out continual monitoring to route surrounding enviroment, route operation conditions and shaft tower situation;Between device has The functions such as having a rest property is taken pictures, sound-light alarm, remote speech are propagandaed directed to communicate have intrusion detection interlink warning function, have shaft tower inclination prison Brake has and carries out the function of thermometric to transmission line wire, terminal, strain clamp, drainage plate, and supports subsequent function The access of energy development hardware.
Current most of monitoring device functions are more single, cannot reflect on the whole on transmission line of electricity be in the presence of with And connection that may be present between each quantity of state, the present invention may be implemented a variety of operation shapes of power transmission line corridor fast and accurately The acquisition of state data, fault location and association analysis function, the operation conditions of transmission line of electricity can be carried out comprehensive assessment and Early warning;
The conducting wire temperature measurement module supports safety electrification installation, can measure the reality of strain clamp, conducting wire, terminal, drainage plate When running temperature;The monitoring device host uses IP65 degree of protection, adapts to outdoor environment normal work, is provided with 500 Ten thousand pixel camera heads, and battery and solar panel is supported to cooperate.
The present invention is built-in with dedicated wireless communication module, the data measured can be sent to monitoring center meter in real time Calculation machine or corresponding controlling terminal, signal transmit fast and stable, support the wireless transmission of certain distance;Device is internally provided with storage Battery can be powered whole device, pressure stabilizing output can be carried out to battery using power module, to each mould in device The working power of block offer 3.3V-5V.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations;To the greatest extent Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into Row equivalent replacement;And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution The range of scheme.

Claims (4)

1. power transmission line intelligent inspection tour system, it is characterised in that: including transmission line of electricity monitoring device (1), the transmission line of electricity prison Control device (1) is mounted at the top of wire pole tower, and transmission line of electricity monitoring device (1) periphery is provided with corresponding transmission line of electricity prison Control module, comprising: the video camera (2) on wire pole tower adjutage is set, and setting sets up cable surface in wire pole tower Temperature sensor (3), the shaft tower angular transducer (4) of wire pole tower bottom is set;The transmission line of electricity monitoring device (1) Be internally provided with central controller (5), the central controller (5) by conducting wire respectively with video camera (2), temperature pass Sensor (3), shaft tower angular transducer (4) are connected;
The central controller (5) is also connected with data memory module (6), sound and light alarm module (7) by conducting wire;
The signal output end of the central controller (5) is also connected with wireless communication module (8), the wireless communication module (8) Pass through wireless network and monitor terminal (9), monitoring center computer (10);
The power input of the central controller (5) is connected with power module (11).
2. power transmission line intelligent inspection tour system according to claim 1, it is characterised in that: the wireless communication module (8) The chip used is wireless communication chips U1, the circuit structure of the wireless communication module (8) are as follows:
1 foot, 2 feet, 3 feet, 4 feet, 5 feet of the wireless communication chips U1 are connected with the signal output end of central controller (5);
7 feet of the wireless communication chips U1 connect 3.3V input power;
9 feet of the wireless communication chips U1 and the one end for meeting crystal oscillator X1 are connected behind one end of resistance R5 with one end of capacitor C9, The other end of the capacitor C9 is grounded;
10 feet of the wireless communication chips U1 and the other end for meeting crystal oscillator X1, after the other end of resistance R5 with capacitor C10 one End is connected, the other end ground connection of the capacitor C10;
One end of 11 feet of the wireless communication module U1 successively shunt-wound capacitance C11, behind one end of capacitor C12 with inductance L3 one End is connected, the other end ground connection of described capacitor C11, C12;
12 feet of the wireless communication module U1 and the one end for meeting inductance L2, the other end behind one end of capacitor C15 with inductance L3 It is connected, the other end ground connection of the capacitor C15;
13 feet of the wireless communication module U1 and the other end for meeting inductance L2, one end behind one end of capacitor C14 with inductance L1 It is connected, the other end of the inductance L1 is connected with one end of capacitor C5, one end of the other end shunt-wound capacitance C6 of the capacitor C5 It is followed by communication antenna E1, the other end ground connection of described capacitor C14, C6;
14 feet of the wireless communication module U1 are grounded;
15 feet of the wireless communication module U1 and 18 feet for meeting wireless communication module U1, one end of capacitor C3, the one of capacitor C2 End is followed by 3.3V input power, the other end ground connection of described capacitor C3, C2;
16 feet of the wireless communication module U1 are connected with one end of resistance R2;
It is grounded after 17 feet of the wireless communication module U1 and the other end of connecting resistance R2;
19 feet of the wireless communication module U1 are connected with one end of capacitor C4;
It is grounded after the other end of the 20 foot shunt-wound capacitance C4 of the wireless communication module U1.
3. power transmission line intelligent inspection tour system according to claim 2, it is characterised in that: the power module (11) uses Chip be voltage-stablizer U2 and voltage-stablizer U3, the circuit structure of the power module (11) are as follows:
One end of the 1 foot shunt-wound capacitance C21 of the voltage-stablizer U2 is followed by 12V input power, and 2 feet of the voltage-stablizer U2 simultaneously connect electricity The one end for holding C22, has the anode of electrode capacitance C23 to be followed by 5V power output end, the 3 foot shunt-wound capacitance C21's of the voltage-stablizer U2 The other end, the other end of capacitor C22 are grounded after the cathode for having electrode capacitance C23;
One end of the 3 foot shunt-wound capacitance C24 of the voltage-stablizer U3 is followed by 5V input power, and 2 feet of the voltage-stablizer U3 simultaneously connect electricity Hold one end of C25, one end of capacitor C26 is followed by 3.3V power output end, and the 1 foot shunt-wound capacitance C24's of the voltage-stablizer U3 is another One end, the other end of capacitor C25 are grounded after the other end of capacitor C26.
4. power transmission line intelligent inspection tour system according to claim 3, it is characterised in that: the wireless communication chips U1's The model 78L05, the model SPX1117 of the voltage-stablizer U3 of model NRF24L01, the voltage-stablizer U2.
CN201811546639.4A 2018-12-18 2018-12-18 Power transmission line intelligent inspection tour system Pending CN109546751A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110978001A (en) * 2019-11-28 2020-04-10 江苏金猫机器人科技有限公司 Industrial robot system based on voice control

Citations (5)

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Publication number Priority date Publication date Assignee Title
EP0869598A1 (en) * 1997-03-03 1998-10-07 Georg Köppl Method for making effective use of the thermal loading limit of high-voltage overhead power lines and cables
CN202353096U (en) * 2011-12-05 2012-07-25 山西省电力公司晋城供电分公司 Ultrahigh voltage power transmission line remote inspection system
CN104536467A (en) * 2014-12-26 2015-04-22 国家电网公司 Beyond visual range aircraft inspection system
CN105182165A (en) * 2015-09-24 2015-12-23 山西大学 System of mobile power supply ground wire connection state real-time monitoring and fault positioning
CN105551179A (en) * 2015-12-17 2016-05-04 大同柏盛电子电气有限公司 Remote video monitoring and early-warning system of high-tension power transmission line

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0869598A1 (en) * 1997-03-03 1998-10-07 Georg Köppl Method for making effective use of the thermal loading limit of high-voltage overhead power lines and cables
CN202353096U (en) * 2011-12-05 2012-07-25 山西省电力公司晋城供电分公司 Ultrahigh voltage power transmission line remote inspection system
CN104536467A (en) * 2014-12-26 2015-04-22 国家电网公司 Beyond visual range aircraft inspection system
CN105182165A (en) * 2015-09-24 2015-12-23 山西大学 System of mobile power supply ground wire connection state real-time monitoring and fault positioning
CN105551179A (en) * 2015-12-17 2016-05-04 大同柏盛电子电气有限公司 Remote video monitoring and early-warning system of high-tension power transmission line

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110978001A (en) * 2019-11-28 2020-04-10 江苏金猫机器人科技有限公司 Industrial robot system based on voice control

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