CN102141395B - ZigBee-based system and method for monitoring wind drift of power transmission line on line - Google Patents
ZigBee-based system and method for monitoring wind drift of power transmission line on line Download PDFInfo
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- CN102141395B CN102141395B CN2011100005567A CN201110000556A CN102141395B CN 102141395 B CN102141395 B CN 102141395B CN 2011100005567 A CN2011100005567 A CN 2011100005567A CN 201110000556 A CN201110000556 A CN 201110000556A CN 102141395 B CN102141395 B CN 102141395B
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Abstract
The invention discloses a ZigBee-based system for monitoring the wind drift of a power transmission line on line, which comprises a ZigBee wireless wind drift detector, a rod tower monitoring sub-machine, a general packet radio service (GPRS) communication module and a monitoring center, which are connected in turn, wherein the rod tower monitoring sub-machine and the GPRS communication module are connected with a power supply module respectively; and the rod tower monitoring sub-machine is connected with a wired wind drift detector. In a method using the system for monitoring, the actual wind drift condition of an insulator string of the power transmission line can be obtained accurately by acquiring the wind drift angles of the topmost and bottommost insulators of the insulator string of the power transmission line in real time or fixed time and by quantitative calculation and qualitative analysis, and thus, the most direct and efficient monitoring of the wind drift of the insulator string of the power transmission line is realized.
Description
Technical field
The invention belongs to power transmission and transformation equipment state on-line monitoring technique field; Relate to a kind of transmission pressure windage yaw on-line monitoring system; Be specifically related to a kind of transmission pressure windage yaw on-line monitoring system, the invention still further relates to the method that this system of employing monitors based on ZigBee.
Background technology
Overhead transmission line receives the influence of natural conditions that multiple disaster accident can take place, and electric transmission line isolator windage yaw flashover is wherein comparatively serious a kind of disaster.The angle of wind deflection of lead suspension insulator is meant that wind acts on and causes the suspension insulator angular deflection on insulator chain and the lead that the lead wind load makes suspension insulator produce deflection.The reason of windage yaw flashover fault mainly is that lead and insulator chain are excessive in the high wind aforesaid downward angle, makes that lead and shaft tower minimum clearance distance are too small.This deflection must cause the lead, suspension clamp of live part, all press shading ring, damper etc. that the air insulation of the grounded part body of the tower of shaft tower, cross-arm, pin nail etc. is reduced at interval.In case the generation of windage yaw flashover fault can cause faults such as transmission of electric energy loss and windage yaw tripping operation.Because the windage yaw tripping operation is under the condition of high wind weather or mima type microrelief area generation squall line wind, to take place, the duration of wind often surpasses reclosing section actuation time, and discharging gap still keeps less distance when making the reclosing action; Simultaneously, during the reclosing action, the switching overvoltage of certain amplitude will appear in the system; Cause the gap to be discharged once more, and discharge just might take place for the second time in bigger gap, therefore; During circuit generation windage yaw tripping operation, the reclosing success ratio is lower, has had a strong impact on power supply reliability.
In recent years; Receive the influence of disastrous meteorological condition; Frequency and intensity that overhead transmission line insulator windage yaw flashover fault takes place obviously increase; Caused enormous economic loss, had a strong impact on the safe operation of electrical network, transmission pressure insulator chain angle of wind deflection is effectively monitored becomes the task of top priority.For a long time; In the design of domestic high pressure overhead power line, when calculating the windage yaw of suspension insulator, all be that insulator is installed a windage yaw detector in the top usually; Only obtain the angle of wind deflection of insulator topmost; Again insulator chain is reduced to the rigidity straight-bar, or the polygon method of stopping, the angle of wind deflection of suspension insulator under the effect of design mean wind speed calculated with the statics method.And in engineering reality; Have only heavylier and just adopt string polygon method when needing under the close inspection strong wind insulator topmost whether to brush up against cross-arm or lower end live part, all insulator chain is reduced to the angle of wind deflection that rigid rod calculates suspension insulator approx generally speaking the gap of cross-arm when suspension insulator.But because insulator chain is actually flexibility, and in the statics computing method, do not consider of the influence of fluctuating wind dynamic perfromance to the insulator chain angle of wind deflection.Therefore, current suspension insulator angle of wind deflection computing method are difficult to the accurately actual windage yaw situation of reflection electric transmission line isolator string.
Summary of the invention
The purpose of this invention is to provide a kind of transmission pressure windage yaw on-line monitoring system, solved existing monitoring system and adopted suspension insulator angle of wind deflection computing method, be difficult to the accurately problem of the actual windage yaw situation of reflection electric transmission line isolator string based on ZigBee.
Another object of the present invention provides a kind of method that adopts said system to monitor.
The technical scheme that the present invention adopted is; Transmission line of electricity windage yaw on-line monitoring system based on ZigBee; Comprise the wireless windage yaw detector of ZigBee, shaft tower monitoring unit, GPRS communication module and the Surveillance center that connect successively; Shaft tower monitoring unit, GPRS communication module also are connected with power module respectively, are connected with wired windage yaw detector on the shaft tower monitoring unit.
Another technical scheme that the present invention adopted is based on the transmission pressure windage yaw on-line monitoring method of ZigBee, specifically to implement according to following steps:
Step 1: the wireless windage yaw detector of ZigBee is installed on the insulator bottom of transmission pressure insulator chain; Wired windage yaw detector is installed on the top insulator of transmission pressure insulator chain, ZigBee is wireless, and the windage yaw detector detects the angle of wind deflection θ that insulator chain is located bottom
nPass to the shaft tower monitoring unit, wired windage yaw detector detects the angle of wind deflection θ that insulator chain is located topmost
1Pass to the shaft tower monitoring unit;
Step 2: the angle of wind deflection θ that the insulator chain that the shaft tower monitoring unit obtained the last step is located bottom
n, the angle of wind deflection θ that topmost locates of insulator chain
1Handle, obtain the offset distance d of whole insulator chain, through the wireless Surveillance center that is transported to of GPRS communication module;
Step 3: Surveillance center is according to the offset distance d of the whole insulator chain that receives; Calculate the actual angle of wind deflection of electric transmission line isolator string; According to the installation and operation parameter of shaft tower and circuit, analyze the ruuning situation that obtains current transmission line of electricity again, instruct the operation maintenance and the management of transmission line of electricity.
The invention has the beneficial effects as follows,
(1) adopt wired windage yaw detector to measure the angle of wind deflection at insulator place topmost; Adopt the wireless windage yaw detector of ZigBee to measure the angle of wind deflection at insulator place bottom; Realization to electric transmission line isolator string windage yaw the most directly, monitoring the most intuitively, improved the precision of monitoring greatly.
(2) adopt the ZigBee technology, realized low cost, low power consumption, do not reduced the transmission of wireless signals of electrical safety distance.
(3) adopt the GPRS wireless communication technology to carry out data transmission and control, avoided the cable construction in the conventional data transmission mode, greatly reduce difficulty and system's installation cost of construction; System's installation of not only can having installed continuously but also can disperse.
(4) adopt the sensor and the microprocessor chip of various low-power consumption, greatly reduce the power consumption of system; Adopt sun power to add accumulator charging/discharging circuit, for system provides stable power, the system that makes can be continuously, for a long time, stably work in the open air.
(5) adopt the B/S pattern to realize remote monitoring, client is non-maintaining, makes the distribution of system concentrated relatively, helps the maintenance of system, has extensibility and dirigibility preferably.
(6) based on the research to insulator chain windage yaw in early stage related data, the upper computer software of Surveillance center has embedded multiple intelligent algorithm, has reduced the error of data greatly, has improved the fitting precision of data.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of monitoring system of the present invention;
Fig. 2 is the structural representation of shaft tower monitoring unit in the monitoring system of the present invention;
Fig. 3 is the structural representation of the wireless windage yaw monitor of ZigBee in the monitoring system of the present invention;
Fig. 4 is the structural representation of power module in the monitoring system of the present invention;
Fig. 5 is the program flow diagram of expert software of Surveillance center in the monitoring system of the present invention;
Fig. 6 is the process flow diagram of shaft tower monitoring unit in the monitoring system of the present invention;
Fig. 7 is the calculating synoptic diagram of transmission pressure windage yaw on-line monitoring new method of the present invention.
Among the figure, 1.ZigBee is wireless windage yaw detector, 2. shaft tower monitoring unit, 3. wired windage yaw detector 4.GPRS communication module, 5. power module; 5-1. solar cell, 5-2. charge protector, 5-3. FET A, 5-4.+12V accumulator, 5-5. FET B; 5-6. discharge protection circuit, 5-7. is the power-off restoration circuit regularly, 5-8.+5V power regulator, 6. Surveillance center, 7. microprocessor unit; 8. data storage cell, 9.ZigBee communication module, 9-1. wireless singlechip, 9-2. exterior antenna, 9-3. galley microwave transmission line; 10. signal acquisition process unit, 11. rain sensors, 12. pressure transducers, 13. Temperature Humidity Sensors; 14. air velocity transducer, 15. wind transducers, 16. intensity of sunshine sensors, 17. obliquity sensors.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
The present invention is based on the structure of a kind of embodiment of transmission line of electricity windage yaw on-line monitoring system of ZigBee; As shown in Figure 1; Comprise successively the wireless windage yaw detector of the ZigBee that connects 1, shaft tower monitoring unit 2, GPRS communication module 4 and Surveillance center 6; Shaft tower monitoring unit 2, GPRS communication module 4 also are connected with power module 5 respectively, are connected with wired windage yaw detector 3 on the shaft tower monitoring unit 2.Wherein,
ZigBee is wireless windage yaw detector 1 is used to gather the angle of wind deflection of insulator bottom, and the signal of gathering is transferred to shaft tower monitoring unit 2;
Shaft tower monitoring unit 2; Be used to monitor the local weather information of gathering the transmission line of electricity surrounding environment, the icing condition information of shaft tower circuit and the angle of wind deflection of the top insulator; Receive the signal that the wireless windage yaw detector 1 of ZigBee sends; Information of gathering and the signal that receives are carried out analyzing and processing and storage, and the data that processing obtains are delivered to GPRS communication module 4;
Wired windage yaw detector 3 is used to gather the angle of wind deflection of insulator topmost;
GPRS communication module 4 adopts H7118 DTU, is used to receive the information that shaft tower monitoring unit 2 sends, and with the information transmission that receives to Surveillance center 6, receive the instruction that Surveillance center 6 sends, and the instruction that will receive is transferred to shaft tower monitoring unit 2;
The structure of shaft tower monitoring unit 2; As shown in Figure 2; Comprise microprocessor unit 7; Microprocessor unit 7 is connected with ZigBee communication module 9, data storage cell 8 and signal acquisition process unit 10 respectively, and signal acquisition process unit 10 is connected with rain sensor 11, pressure transducer 12, Temperature Humidity Sensor 13, air velocity transducer 14, wind transducer 15 and intensity of sunshine sensor 16 respectively.Shaft tower monitoring unit 2 is connected with GPRS communication module 4 through microprocessor unit 7; Shaft tower monitoring unit 2 is connected with wired windage yaw detector 3 through signal acquisition process unit 10, and power module 5 is connected with signal acquisition process unit 10, microprocessor unit 7 respectively.
The collection of environment weather information around the pulling force of shaft tower monitoring unit 2 main completion transmission lines of electricity the top insulator angle of wind deflection and shaft tower circuit ambient temperature and humidity, wind speed, wind direction, rainfall, intensity of sunshine, shaft tower place circuit etc.; And the data that the wireless windage yaw detector of the ZigBee that receives 1 sends are handled, pack; And the storage important information, control GPRS communication etc. simultaneously.Microprocessor unit 7 in the shaft tower monitoring unit 2 is selected 16 MSP430F247 microprocessors of TI company for use; Possess super low-power consumption and abundant peripheral hardware; Have 1 16 bit timing device A that have 3 comparisons/catch passage and 1 and have 7 comparisons/catch, 16 bit timing device B of passage; 12 ADC modules of 8 tunnel that microprocessor internal is integrated can the various digital signals of fast processing, simulating signal and pulse signal, this microprocessor 4 kinds of low-power consumption modes in addition except activity pattern; Realizing the high performance while, reducing system power dissipation.
Temperature Humidity Sensor 13 is selected the Temperature Humidity Sensor SHT10 based on the CMOSensTM technology for use, and this sensor combines the CMOS chip technology with sensor technology, and has the I of industrial standard
2C bus digital output interface, the output resolution ratio of humidity value and temperature value are respectively 14 and 12, and are programmed for 12 and 8.Current drain during this sensor measurement is 550 μ A, and average out to 28 μ A are 3 μ A during dormancy, and have good stability.
Air velocity transducer 14 adopts the three cup type photoelectricity air velocity transducer WAA15 of low threshold value (0.4m/s), measurement range 0～75m/s, and its output signal is a pulse signal, and signal frequency is directly proportional with wind speed, accomplishes measuring wind speed frequently through the meter in the unit interval.
Wind transducer 15 is the single-blade weathercock, when weathercock rotates, drives Gray's code-disc (seven, resolution is 2.8 °) and rotates, and moving 2.8 ° of Gray's code-disc revolution, the photoelectric tube group produces new seven bit parallel Gray code digital signals output.
The simulating signal of pressure transducer 12 outputs 0～5V, this simulating signal is directly imported Simulation with I/O mouth of receiving microprocessor unit 7 and is handled.
Intensity of sunshine sensor 16 adopts the TBQ-2 sensor, is used to measure intensity of sunshine, and the analog voltage signal of this sensor output 0～20mV is through being modulated to the simulating signal of 0～2.5V after the multipole amplification.
Signal acquisition process unit 10 is comprehensive units; Adopt electronics universal signal processing mode; Signal to the input of microprocessor unit 7 front ends carries out filtering, anti-interference and voltage stabilizing processing, prevents the input/output end port of the superpotential damage microprocessor unit 7 of this input signal.
GPRS communication module 4 is supported double frequency GSM/GPRS, meets ETSI GSM Phase 2+ standard, and data terminal is always online; Support A5/1&A5/5 AES, transparent data transmission and protocol conversion, virtual support data private, short message data alternate channel (option) are supported dynamic data center domain name and IP address; Support RS-232/422/485 or Ethernet interface, can carry out software upgrading, and possess self diagnosis, alarm output and interference free performance through Xmodem Protocol; Be suitable for demands of applications in the electromagnetic environment rugged surroundings; This module adopts advanced power technology, and power supply accommodation is wide, and stability better; The apolegamy moisture-proof case is fit to outdoor application.Can directly be connected, realize the GPRS function that dials up on the telephone with monitoring terminal equipment.This module performance is stable, is enough to satisfy the system design needs.
The microprocessor unit 7 of shaft tower monitoring unit 2 is the 3.3V low-power dissipation system; A lot of input/output signals do not match; Adopted a large amount of holding circuits in the system, owing to be operated in the ZigBee node on the 2.4G frequency band, system has adopted anti-high frequency interference simultaneously for this reason; In shaft tower monitoring unit 2, take multiple interference protection measure, guaranteed the stability of shaft tower monitoring unit 2 work.
The structure of ZigBee is wireless windage yaw detector 1; As shown in Figure 3, comprise the ZigBee communication module 9 and obliquity sensor 17 that are connected, the structure of ZigBee communication module 9 is: comprise wireless singlechip 9-1; The pin 11 of wireless singlechip 9-1 is connected with pin 3 with the pin 2 of obliquity sensor 17 respectively with pin 12; The pin 44 of wireless singlechip 9-1 is connected with capacitor C 1, capacitor C 1 ground connection, and the pin 43 of wireless singlechip 9-1 is connected with capacitor C 2; Capacitor C 2 ground connection are parallel with crystal oscillator 1 between pin 44 and the pin 43; The pin 19 of wireless singlechip 9-1 is connected with capacitor C 5, capacitor C 5 ground connection, and the pin 21 of wireless singlechip 9-1 is connected with capacitor C 4, capacitor C 4 ground connection; The pin 32 of wireless singlechip 9-1 is connected with an end of inductance L 2, the end of galley microwave transmission line 9-3 respectively; The other end of inductance L 2 is connected with the pin 34 of wireless singlechip 9-1; The other end of galley microwave transmission line 9-3 is connected with an end of the other end of inductance L 2, pin 34, inductance L 3 respectively; The other end of inductance L 3 is connected with capacitor C 3, and capacitor C 3 is connected with exterior antenna 9-2.
The structure of power module 5; As shown in Figure 4; Comprise successively solar cell 5-1 that parallel connection is provided with, resistance R 1, charge protector 5-2, FET A5-3 ,+12V accumulator 5-4, discharge protection circuit 5-6, regularly power-off restoration circuit 5-7 and+5V power regulator 5-8; The positive pole of solar cell 5-1 and negative pole are connected with negative pole with the positive pole of+12V accumulator 5-4 respectively; The minus earth of solar cell 5-1 and+12V accumulator 5-4, the positive pole of solar cell 5-1 and+be in series with diode D1 between the positive pole of 12V accumulator 5-4, diode D1 is between+12V accumulator 5-4 and FET A5-3; The negative pole of diode D1 is connected with the positive pole of+12V accumulator 5-4; FET A5-3 also is connected with charge protector 5-2, is connected with FET B5-5 between resistance R 2 and the discharge protection circuit 5-6, and FET B5-5 is connected with the negative pole of+12V accumulator 5-4.
This monitoring system is worked in the open air, is difficult to power taking, and power module 5 employing sun power add the powering mode of accumulator, for system provides 5 volts stable and 12 volts of power supplys.And charge protector 5-2, discharge protection circuit 5-6 and power-off restoration circuit 5-7 have regularly been adopted.When diode D1 was used for overcast and rainy and night not having sunshine ,+12V accumulator 5-4 discharged to solar cell 5-1; Resistance R 1 is a voltage dependent resistor (VDR) with resistance R 2, is used for anti-thunderbolt protection; FET A5-3 is used for charging control, and FET B5-5 is used for discharge control.
The wireless windage yaw detector 1 of ZigBee is in order to reduce power consumption in this monitoring system; Just be in sleep state (low power consumpting state) after powering on; After the order of the collection angle of wind deflection that the ZigBee communication module 9 that receives on the shaft tower monitoring unit 2 is sent, forward aggressive mode to from park mode at once, begin to gather the inclination angle value of place, monitoring point both direction; And the inclination angle value of gathering sent to shaft tower monitoring unit 2, sending successfully afterwards, the wireless windage yaw detector 1 of ZigBee changes sleep pattern once more over to.
The program flow diagram of expert software of Surveillance center; As shown in Figure 5; The expert software of Surveillance center can monitor the variable situation on each shaft tower of this circuit in real time, and carries out analysis and judgement through the real time data of the point of extension set being surveyed, patrolling survey, and the reference frame of analyzing the transmission pressure windage yaw is provided.When data such as wire tension, ambient wind velocity, insulator angle of wind deflection surpass early warning and alarm threshold value, in time provide early warning and warning message.
The process flow diagram of shaft tower monitoring unit 2, as shown in Figure 6, after the success of shaft tower monitoring unit 2 power-on self-tests,, change low-power consumption mode over to for reducing the power consumption of system.After shaft tower monitoring unit 2 receives the collection that Surveillance center 6 sends and sends the order of data; Change activity pattern over to from low-power consumption mode at once; Let the ZigBee communication module 9 that is installed on the shaft tower monitoring unit 2 send the order of gathering the windage yaw value to other node on the one hand, microprocessor unit 7 begins to gather the signal that each sensor sends on the shaft tower on the other hand, after the whole finishing collecting of two paths of data; Microprocessor unit 7 control GPRS communication modules 4; The data of gathering are sent to Surveillance center 6, and after data were sent successfully, shaft tower monitoring unit 2 changed low power consumpting state once more over to.
Monitoring system of the present invention; In real time/timing acquiring electric transmission line isolator string topmost with the angle of wind deflection of insulator bottom; Through quantitative Analysis and qualitative analysis; Accurately obtain the actual windage yaw situation of electric transmission line isolator string, realized to the windage yaw of electric transmission line isolator string the most directly, the most effectively the monitoring.
A kind of transmission pressure windage yaw of the present invention on-line monitoring method, specifically implement according to following steps:
Step 1: the wireless windage yaw detector 1 of ZigBee is installed on the insulator bottom of transmission pressure insulator chain; Wired windage yaw detector 3 is installed on the top insulator of transmission pressure insulator chain; In transmission pressure insulator swing process, ZigBee is wireless, and windage yaw detector 1 detects the angle of wind deflection θ that insulator chain is located bottom
nPass to shaft tower monitoring unit 2, wired windage yaw detector 3 detects the angle of wind deflection θ that insulator chain is located topmost
1Pass to shaft tower monitoring unit 2;
Step 2: 2 pairs of shaft tower monitoring units are gone up the angle of wind deflection θ that insulator chain that the step obtains is located bottom
n, the angle of wind deflection θ that topmost locates of insulator chain
1Handle, obtain the offset distance d of whole insulator chain, be transported to Surveillance center 6 through GPRS communication module 4 remote-wireless.
Specifically implement according to following algorithm: as shown in Figure 7, the length of supposing whole insulator chain is l, obtains the angle of wind deflection θ of insulator topmost through wired windage yaw monitor
1, obtain the angle of wind deflection θ of insulator bottom through wireless windage yaw detector
n, the angle of wind deflection that calculates each sheet insulator is:
θ
n (4)
Through the insulator chain model of installing, obtain the length L of each sheet insulator, the offset distance that calculates whole insulator chain then is:
d＝L·sinθ
1+L·sinθ
2+L·sinθ
3+…+Lsinθ
n
＝L·(sinθ
1+sinθ
2+sinθ
3+…+sinθ
n) (5)
The method that existing transmission pressure windage yaw monitoring system adopts all is only to record the angle of wind deflection θ of insulator topmost
1, becoming the rigidity stretched to whole insulator chain equivalence then, the insulator offset distance that calculates like this is:
d′＝l·sinθ
1 (6)
Obviously, there is very big error in the insulator chain offset distance that calculates like this.
Step 3: Surveillance center 6 is according to the real-time transmission line information data that receive; Calculate the actual angle of wind deflection of electric transmission line isolator string; According to the installation and operation parameter of shaft tower and circuit, analyze the ruuning situation that obtains current transmission line of electricity again, instruct the operation maintenance and the management of transmission line of electricity.
Embodiment
Suppose the long 12m of whole insulator chain, constitute by 80 insulators, the every long L=0.15m of insulator, existing one group of on-the-spot lead windage yaw data are calculated respectively through monitoring method of the present invention and former conventional method, compare analysis:
The comparison of table 1 monitoring method of the present invention and conventional method
Can find out that through table 1 transmission pressure windage yaw monitoring method of the present invention can react actual lead windage yaw situation more accurately.
Claims (2)
1. based on the transmission pressure windage yaw on-line monitoring method of ZigBee, it is characterized in that, specifically implement according to following steps:
Step 1: the wireless windage yaw detector of ZigBee (1) is installed on the insulator bottom of transmission pressure insulator chain; Wired windage yaw detector (3) is installed on the top insulator of transmission pressure insulator chain, ZigBee is wireless, and windage yaw detector (1) detects the angle of wind deflection θ that insulator chain is located bottom
nPass to shaft tower monitoring unit (2), wired windage yaw detector (3) detects the angle of wind deflection θ that insulator chain is located topmost
1Pass to shaft tower monitoring unit (2);
Step 2: the angle of wind deflection θ that the insulator chain that shaft tower monitoring unit (2) obtained the last step is located bottom
n, the angle of wind deflection θ that topmost locates of insulator chain
1Handle, obtain the offset distance d of whole insulator chain, through the wireless Surveillance center (6) that is transported to of GPRS communication module (4);
Step 3: Surveillance center (6) is according to the offset distance d of the whole insulator chain that receives; Calculate the actual angle of wind deflection of electric transmission line isolator string; Again according to the installation and operation parameter of shaft tower and circuit; Analysis obtains the ruuning situation of current transmission line of electricity, instructs the operation maintenance and the management of transmission line of electricity.
2. the transmission pressure windage yaw on-line monitoring method based on ZigBee according to claim 1 is characterized in that the angle of wind deflection θ that said step 2 shaft tower monitoring unit (2) is located insulator chain bottom
n, the angle of wind deflection θ that topmost locates of insulator chain
1Handle, specifically implement according to following steps:
The length of supposing whole insulator chain is l, and the angle of wind deflection that calculates each sheet insulator is:
θ
n，
According to the length L of each corresponding sheet insulator of insulator chain, the offset distance that calculates whole insulator chain is:
d＝L·sinθ
1+L·sinθ
2+L·sinθ
3+…+L·sinθ
n
＝L·(sinθ
1+sinθ
2+sinθ
3+…+sinθ
n)。
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| CN2852542Y (en) * | 2005-11-07 | 2006-12-27 | 国网北京电力建设研究院 | Wireless communication base station for transmission line monitoring |
| CN101571413B (en) * | 2009-06-17 | 2011-02-09 | 西安工程大学 | Transmission line galloping on-line monitoring system based on acceleration sensor |
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2011
- 2011-01-04 CN CN2011100005567A patent/CN102141395B/en not_active Expired - Fee Related
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| CN102141395A (en) | 2011-08-03 |
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