CN103344170A - High voltage transmission conductor sag measuring device and method - Google Patents
High voltage transmission conductor sag measuring device and method Download PDFInfo
- Publication number
- CN103344170A CN103344170A CN2013102618983A CN201310261898A CN103344170A CN 103344170 A CN103344170 A CN 103344170A CN 2013102618983 A CN2013102618983 A CN 2013102618983A CN 201310261898 A CN201310261898 A CN 201310261898A CN 103344170 A CN103344170 A CN 103344170A
- Authority
- CN
- China
- Prior art keywords
- sag
- measurement mechanism
- high voltage
- unit
- conductive wire
- 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
Links
Images
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a high voltage transmission conductor sag measuring device. The measuring device comprises a measuring device shell body which is arranged on a transmission conductor. A radar waveguide opening and a radio frequency antenna are arranged on the surface of the measuring device shell body respectively. A monitoring device main control unit is arranged in the measuring device shell body. The monitoring device main control unit comprises a central processing unit which is connected with a radar sensor unit and a power supply unit respectively through wires. The central processing unit is further connected with a data monitoring terminal and a monitoring center respectively through a communication module. The invention further discloses a measuring method of the measuring device, wherein the radar sensor unit is used for transmitting collected sag information to the central processing unit, and then the central processing unit conducts calculation to obtain a transmission conductor sag value. The high voltage transmission conductor sag measuring device and method can monitor the changes in the sag of a high voltage transmission line in real time and transmit the monitoring data to the backstage monitoring center, thereby guaranteeing the safe operation of an electric power circuit.
Description
Technical field
The invention belongs to the power transmission and transforming equipment monitoring technical field, be specifically related to a kind of high voltage electricity transmission conductive wire sag measurement mechanism, the invention still further relates to the method that above-mentioned high voltage electricity transmission conductive wire sag measurement mechanism is measured sag.
Background technology
The high voltage electricity transmission conductive wire sag is the important indicator of line security operation, the size of lead sag should be controlled in certain scope, if the requirement that the sag of lead is against regulation, excessive or too smallly all may cause broken string earth fault because the stress of conductor surpasses permissible value, even destroy tower structure or the wind cycloid set up lead and cause phase fault, produce electric arc, the electric spark combustible on every side that ignites.
In recent years, because the sharp increase of power load, many transmission lines of electricity are in order to improve transport capacity, the highest operation allowable temperature of lead is brought up to 80 ° of C from 70 ° of C, at this moment the transmission line of electricity sag just becomes main restraining factors, need carry out verification or monitoring in real time to the transmission line of electricity sag, to guarantee the transmission line of electricity operation and by the safety of line balance converter.
At present, people have proposed several different methods at the measurement of transmission line of electricity sag and monitoring in real time, traditional transmission line of electricity sag measuring method mainly contains: be suitable for the mid point height method of landform comparison flat site and be suitable for the mountain region and the preset angle configuration of high mountain high hill stringing and degree of speeding plate observation method, but these measuring method workloads are big, and are also closely bound up with surveying work personnel's the security of the lives and property sometimes.In addition, also have by tension force or measurement of dip angle sag, utilize conductor temperature to measure sag and survey sag etc. by stress, but these method inconvenient operation, measurement parameter are many, cause the sag degree of accuracy that records lower.Therefore, further investigation is carried out monitoring in real time accurately significant to the transmission line of electricity sag.
Summary of the invention
The object of the present invention is to provide a kind of high voltage electricity transmission conductive wire sag measurement mechanism, the sag that can monitor ultra-high-tension power transmission line for a long time, in real time changes, and Monitoring Data can be transferred to backstage monitoring center, be convenient in time understand the sag variation of ultra-high-tension power transmission line, guarantee the power circuit safe operation.
Another object of the present invention is to provide above-mentioned high voltage electricity transmission conductive wire sag measurement mechanism to measure the method for sag.
The technical solution adopted in the present invention is, high voltage electricity transmission conductive wire sag measurement mechanism, include the measurement mechanism housing, the measurement mechanism housing is arranged on the transmission pressure, the measurement mechanism surface of shell is respectively arranged with radar waveguide mouth, wireless radio frequency antenna, include the monitoring device main control unit in the measurement mechanism housing, the monitoring device main control unit includes CPU (central processing unit), CPU (central processing unit) is connected with the radar sensor unit respectively by lead, power supply power supply unit, CPU (central processing unit) also by communication module respectively with transmission tower on the data monitoring terminal, the communication apparatus of Surveillance center connects.
Characteristics of the present invention also are,
The measurement mechanism housing is arranged at transmission pressure sag maximum; The measurement mechanism housing adopts irony or alloy to make.
The radar waveguide mouth of measurement mechanism surface of shell setting is horn-like, and radar waveguide mouth is facing to measuring object.
Communication module adopts ZigBee module or the RF radio-frequency module with MANET function.
The radar sensor unit includes A/D converting unit and the microwave radar distance measuring sensor that connects successively by lead.
The power supply power supply unit includes the power control circuit unit, and the power control circuit unit is connected with by lead respectively and charges and discharge accumulator, lead induction power taking unit.
Lead induction power taking unit adopts bayonet type.
Another technical scheme of the present invention is that high voltage electricity transmission conductive wire sag measurement mechanism is measured the measuring method of sag, specifically implements according to following steps:
The characteristics of another technical scheme of the present invention also are,
Step 2.1, utilize the microwave radar sensor in the radar sensor unit to gather transmission pressure sag information simulation signal, and transmission pressure sag information simulation signal is passed to the A/D converting unit;
Step 2.2, through step 2.1, the A/D converting unit converts transmission pressure sag information simulation signal to digital signal;
Step 2.3, A/D converting unit are sent to CPU (central processing unit) with the digital signal in the step 2.2.
The sag L that the transmission pressure sag information calculations that step 3.1, the transmission pressure sag algoritic module that utilizes setting in the CPU (central processing unit) and step 2 obtain goes out transmission pressure, specifically implement according to following algorithm:
In the formula, f
bBe difference frequency, △ f is tuning range, and T is modulation period, and C is propagation velocity of electromagnetic wave.
The sag L of step 3.2, transmission pressure that step 3.1 is obtained is sent to data monitoring terminal on the transmission tower via communication module through the ZigBee network, finally is sent on the communication apparatus of Surveillance center by the data monitoring terminal again.
Beneficial effect of the present invention is:
(1) high voltage electricity transmission conductive wire sag measurement mechanism of the present invention can be monitored the sag variation of ultra-high-tension power transmission line for a long time, in real time, and Monitoring Data can be transferred to backstage monitoring center, be convenient in time understand the sag variation of ultra-high-tension power transmission line, guarantee the power circuit safe operation.
(2) high voltage electricity transmission conductive wire sag measurement mechanism of the present invention is in the process that monitoring high voltage electricity transmission conductive wire sag changes, if when finding to surpass early warning value, can in time report to the police, avoided high voltage electricity transmission conductive wire owing to wire icing cause over the ground, tree, the too small generation that causes power circuit accidents such as ground connection, short circuit of buildings distance.
Description of drawings
Fig. 1 is the structural representation of high voltage electricity transmission conductive wire sag measurement mechanism of the present invention;
Fig. 2 is that high voltage electricity transmission conductive wire sag measurement mechanism of the present invention is arranged at the structural drawing on the transmission pressure;
Fig. 3 adopts high voltage electricity transmission conductive wire sag measurement mechanism of the present invention to carry out sag to measure transmitting and the frequency relation figure that receives signal of setting up.
Among the figure, 1. monitoring device main control unit, 2. CPU (central processing unit), 3. microwave radar distance measuring sensor, 4. the power control circuit unit 5. charges and discharge accumulator, 6. lead is responded to the power taking unit, 7. communication module, 8.A/D converting unit, 9. radar sensor unit, 10. power supply power supply unit, 11. transmission pressure, 12. wireless radio frequency antennas, 13. radar waveguide mouths.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
High voltage electricity transmission conductive wire sag measurement mechanism of the present invention, its structure as shown in Figure 1, include the measurement mechanism housing, the measurement mechanism housing is arranged on the transmission pressure 11, the measurement mechanism surface of shell is respectively arranged with radar waveguide mouth 13, wireless radio frequency antenna 12, include monitoring device main control unit 1 in the measurement mechanism housing, monitoring device main control unit 1 includes CPU (central processing unit) 2, CPU (central processing unit) 2 is connected with radar sensor unit 9 respectively by lead, power supply power supply unit 10, CPU (central processing unit) 2 also by communication module 7 respectively with transmission tower on the data monitoring terminal, the communication apparatus of Surveillance center connects.
The measurement mechanism housing is arranged at transmission pressure 11 sag maximums.
The measurement mechanism housing adopts irony or alloy to make, and reaches the IP66 protection level, closely contacts with transmission pressure during installation, and is fixing reliable.
The radar waveguide mouth 13 that the measurement mechanism surface of shell arranges is horn-like, and 13 pairs of landing grounds of radar waveguide mouth or trees or buildings are namely facing to measuring object.
Communication module 7 adopts ZigBee module or the RF radio-frequency module with MANET function, communication module 7 can send to the data that monitor the data monitoring terminal on the transmission tower that is installed in nearby, also can adopt the communication modes of GPRS, note or 3G directly data to be sent to the communication apparatus that arranges in the monitoring center.
Radar sensor unit 9 includes A/D converting unit 8 and the microwave radar distance measuring sensor 3 that connects successively by lead.
Power supply power supply unit 10 includes power control circuit unit 4, and power control circuit unit 4 is connected with by lead respectively and charges and discharge accumulator 5, lead induction power taking unit 6.
Wherein, lead induction power taking unit 6 adopts bayonet type, can be fixed on the transmission pressure 11.Can obtain induction current on the transmission pressure 11 by the inductive coil of lead induction power taking unit 6, this induction current is handled the back through power control circuit unit 4 and is charged to charging and discharging accumulator 5, carry out in strict accordance with the charging and discharging of accumulator principle; Electric current was low when lead induction power taking unit 6 started, and can normally use in power circuit electric current 20A～4000A scope; The general 8AH battery that is equipped with, can be single charge be finished after circuit continuously in the power failure 30 days monitoring device normally move.
High voltage electricity transmission conductive wire sag measurement mechanism of the present invention is measured the method for sag, specifically implements according to following steps:
Step 2.1, utilize the microwave radar sensors 3 in the radar sensor unit 9 to gather transmission pressure sag information simulation signals, and transmission pressure sag information simulation signal is passed to A/D converting unit 8;
Step 2.2, through step 2.1, A/D converting unit 8 converts transmission pressure sag information simulation signal to digital signal;
Step 2.3, A/D converting unit 8 are sent to CPU (central processing unit) 2 with the digital signal in the step 2.2.
The sag L that the transmission pressure sag information calculations that step 3.1, the transmission pressure sag algoritic module that utilizes setting in the CPU (central processing unit) 2 and step 2 obtain goes out transmission pressure, specifically implement according to following algorithm:
In the formula, f
bBe difference frequency, △ f is tuning range, and T is modulation period, and C is propagation velocity of electromagnetic wave.
The sag L of step 3.2, transmission pressure that step 3.1 is obtained is sent to data monitoring terminal on the transmission tower via communication module 7 through the ZigBee network, finally is sent on the communication apparatus of Surveillance center by the data monitoring terminal again.Wherein communication module 7 is the ZigBee module.
The principle of microwave radar distance measuring sensor 3 image data is:
Adopt the Continuous Wave with frequency modulation method to find range, by monitoring device main control unit 1 control emission electromagnetic wave, running into back reflections such as ground, trees, buildings returns, need T time delay, if monitoring device is L to the measured object distance, range cells is received the electromagnetic wave that returns in time T, 2L=CT then, wherein, C is propagation velocity of electromagnetic wave, and T can utilize the monitoring master control borad to obtain by computing, then the L=CT/2 that can ask, namely try to achieve monitoring device to the distance of measured object (ground, trees, buildings), thereby can obtain the actual sag L of transmission pressure.
Adopt the microwave radar distance measuring sensor 3 in the high voltage electricity transmission conductive wire sag measurement mechanism to measure in the process of the range information between object and the measurement point, only produce the frequency delay effect, namely owing to the delay in transmission time, there is the difference on the frequency in transmit and the echoed signal of synchronization.
Measuring under the static situation of object, the voltage controlled oscillator modulation signal in the microwave radar distance measuring sensor 3 is selected sawtooth wave for use, and this is because the antijamming capability of sawtooth wave is better than triangular wave; Modulating through sawtooth wave is VCO, produces a Continuous Wave with frequency modulation signal, and the frequency range of this Continuous Wave with frequency modulation signal is △ f.
The Continuous Wave with frequency modulation signal is gone out through wireless radio frequency antenna 12, and when running into object to be measured, return, after elapsed time postponed τ, reflection wave was caught by the radar receiving antenna of microwave radar distance measuring sensor 3 and is sent in the built-in frequency mixer of microwave radar distance measuring sensor 3 and carry out Frequency mixing processing; At this moment, echoed signal is the same with the transmitted wave waveform, but a temporal delay τ is arranged, it just electromagnetic wave travel to and fro between the used time between sensor and the object under test; And the relation in direct ratio of the distance between the two, i.e. τ=2L/C, wherein, L represents measuring distance, C is the light velocity.
Radar sensor is by the signal source part, the mixing output, and signal transmitting and receiving is partly formed.
Transmit with the echoed signal mixing after difference frequency be f
b, then have:
f
b(t)=f(t)-f(t-τ)；
Wherein, transmit and the frequency relation figure that receives signal, as shown in Figure 3, can be learnt by the triangle similarity:
f
b/τ=△f/T；
Namely
Again according to τ=2L/C, so draw at last:
By above-mentioned formula (1) as can be seen: light velocity C is constant, is measuring under the static situation of object institute's distance L of asking and difference frequency f
b, tuning range △ F and modulation period T relevant; Tuning range △ f and modulation period T arrange in early stage under the situation about finishing, radar passage output signal comprises and distance unique relevant difference frequency difference frequency f closely
b, can handle the distance of obtaining a result by signal in this.
Claims (10)
1. high voltage electricity transmission conductive wire sag measurement mechanism, it is characterized in that, include the measurement mechanism housing, described measurement mechanism housing is arranged on the transmission pressure (11), described measurement mechanism surface of shell is respectively arranged with radar waveguide mouth (13), wireless radio frequency antenna (12), include monitoring device main control unit (1) in the described measurement mechanism housing, described monitoring device main control unit (1) includes CPU (central processing unit) (2), described CPU (central processing unit) (2) is connected with radar sensor unit (9) respectively by lead, power supply power supply unit (10), described CPU (central processing unit) (2) also by communication module (7) respectively with transmission tower on the data monitoring terminal, the communication apparatus of Surveillance center connects.
2. high voltage electricity transmission conductive wire sag measurement mechanism according to claim 1 is characterized in that, described measurement mechanism housing is arranged at transmission pressure (11) sag maximum; Described measurement mechanism housing adopts irony or alloy to make.
3. high voltage electricity transmission conductive wire sag measurement mechanism according to claim 1 is characterized in that, the radar waveguide mouth (13) that described measurement mechanism surface of shell arranges is horn-like, and described radar waveguide mouth (13) is facing to measuring object.
4. high voltage electricity transmission conductive wire sag measurement mechanism according to claim 1 is characterized in that, described communication module (7) adopts ZigBee module or the RF radio-frequency module with MANET function.
5. high voltage electricity transmission conductive wire sag measurement mechanism according to claim 1 is characterized in that, described radar sensor unit (9) includes A/D converting unit (8) and the microwave radar distance measuring sensor (3) that connects successively by lead.
6. high voltage electricity transmission conductive wire sag measurement mechanism according to claim 1, it is characterized in that, described power supply power supply unit (10) includes power control circuit unit (4), and described power control circuit unit (4) is connected with by lead respectively and charges and discharge accumulator (5), lead induction power taking unit (6).
7. high voltage electricity transmission conductive wire sag measurement mechanism according to claim 6 is characterized in that, described lead induction power taking unit (6) adopts bayonet type.
8. high voltage electricity transmission conductive wire sag measurement mechanism is measured the measuring method of sag, and this measuring method is characterized in that based on the described high voltage electricity transmission conductive wire sag of claim 1 measurement mechanism, specifically implements according to following steps:
Step 1, the measurement mechanism housing is arranged at transmission pressure (11) goes up the sag maximum;
Step 2, utilize radar sensor unit (9) that the sag information that collects is passed to CPU (central processing unit) (2):
Step 3, utilize the transmission pressure sag algoritic module in the CPU (central processing unit) (2) to calculate, obtain the sag of transmission pressure.
9. according to claim 8. high voltage electricity transmission conductive wire sag measurement mechanism is measured the measuring method of sag, it is characterized in that described step 2 is specifically implemented according to following steps:
Step 2.1, utilize the microwave radar sensor (3) in the radar sensor unit (9) to gather transmission pressure sag information simulation signal, and transmission pressure sag information simulation signal is passed to A/D converting unit (8);
Step 2.2, through step 2.1, A/D converting unit (8) converts transmission pressure sag information simulation signal to digital signal;
Step 2.3, A/D converting unit (8) are sent to CPU (central processing unit) (2) with the digital signal in the step 2.2.
10. according to claim 8. high voltage electricity transmission conductive wire sag measurement mechanism is measured the measuring method of sag, it is characterized in that described step 3 is specifically implemented according to following steps:
The sag L that the transmission pressure sag information calculations that step 3.1, the transmission pressure sag algoritic module that utilizes setting in the CPU (central processing unit) (2) and step 2 obtain goes out transmission pressure, specifically implement according to following algorithm:
In the formula, f
bBe difference frequency, △ f is tuning range, and T is modulation period, and C is propagation velocity of electromagnetic wave.
The sag L of step 3.2, transmission pressure that step 3.1 is obtained is sent to data monitoring terminal on the transmission tower via communication module (7) through the ZigBee network, finally is sent on the communication apparatus of Surveillance center by the data monitoring terminal again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102618983A CN103344170A (en) | 2013-06-26 | 2013-06-26 | High voltage transmission conductor sag measuring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102618983A CN103344170A (en) | 2013-06-26 | 2013-06-26 | High voltage transmission conductor sag measuring device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103344170A true CN103344170A (en) | 2013-10-09 |
Family
ID=49278986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102618983A Pending CN103344170A (en) | 2013-06-26 | 2013-06-26 | High voltage transmission conductor sag measuring device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103344170A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728511A (en) * | 2013-12-20 | 2014-04-16 | 西安理工大学 | High-voltage direct-current transmission grounding grid state online monitoring system and monitoring method |
| CN104006793A (en) * | 2014-06-17 | 2014-08-27 | 国家电网公司 | Sag real-time monitoring device |
| CN105222749A (en) * | 2015-09-18 | 2016-01-06 | 郑州信工智能化系统有限公司 | A kind of power transmission line sag on-line monitoring method and device |
| CN105510766A (en) * | 2015-11-06 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Radio frequency cable fault positioning detection device and method |
| CN104534997B (en) * | 2015-01-14 | 2016-09-21 | 国家电网公司 | Power transmission line sag monitoring device |
| CN106340188A (en) * | 2016-09-29 | 2017-01-18 | 深圳普智联科机器人技术有限公司 | Roadside parking space detection device and detecting method thereof |
| CN110595340A (en) * | 2019-07-09 | 2019-12-20 | 国网江苏省电力有限公司徐州供电分公司 | High-voltage overhead transmission line sag detection system based on field intensity change and detection method thereof |
| CN110926322A (en) * | 2019-09-30 | 2020-03-27 | 国网浙江省电力有限公司湖州供电公司 | Portable power transmission and distribution line sag detection device |
| CN113405473A (en) * | 2021-07-26 | 2021-09-17 | 贵州送变电有限责任公司 | High-precision sag observation equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201134152Y (en) * | 2007-12-29 | 2008-10-15 | 国网北京电力建设研究院 | Monitoring device and system for swinging of overhead electricity transmission line |
| CN201904655U (en) * | 2010-11-23 | 2011-07-20 | 华北电网有限公司廊坊供电公司 | Online monitoring device for high-voltage overhead power transmission lines |
| CN202204614U (en) * | 2011-08-25 | 2012-04-25 | 王孝敬 | Monitoring device for measuring lead wire sag and lead wire temperature of overhead transmission line |
| CN103091680A (en) * | 2013-01-11 | 2013-05-08 | 北京国网富达科技发展有限责任公司 | Measuring method and measuring system for distance from wires to ground |
| CN103149568A (en) * | 2013-03-11 | 2013-06-12 | 西北工业大学 | Radar-imaging-based wobbling state monitoring system for overhead line system |
-
2013
- 2013-06-26 CN CN2013102618983A patent/CN103344170A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201134152Y (en) * | 2007-12-29 | 2008-10-15 | 国网北京电力建设研究院 | Monitoring device and system for swinging of overhead electricity transmission line |
| CN201904655U (en) * | 2010-11-23 | 2011-07-20 | 华北电网有限公司廊坊供电公司 | Online monitoring device for high-voltage overhead power transmission lines |
| CN202204614U (en) * | 2011-08-25 | 2012-04-25 | 王孝敬 | Monitoring device for measuring lead wire sag and lead wire temperature of overhead transmission line |
| CN103091680A (en) * | 2013-01-11 | 2013-05-08 | 北京国网富达科技发展有限责任公司 | Measuring method and measuring system for distance from wires to ground |
| CN103149568A (en) * | 2013-03-11 | 2013-06-12 | 西北工业大学 | Radar-imaging-based wobbling state monitoring system for overhead line system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728511A (en) * | 2013-12-20 | 2014-04-16 | 西安理工大学 | High-voltage direct-current transmission grounding grid state online monitoring system and monitoring method |
| CN104006793A (en) * | 2014-06-17 | 2014-08-27 | 国家电网公司 | Sag real-time monitoring device |
| CN104534997B (en) * | 2015-01-14 | 2016-09-21 | 国家电网公司 | Power transmission line sag monitoring device |
| CN105222749A (en) * | 2015-09-18 | 2016-01-06 | 郑州信工智能化系统有限公司 | A kind of power transmission line sag on-line monitoring method and device |
| CN105510766A (en) * | 2015-11-06 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Radio frequency cable fault positioning detection device and method |
| CN106340188A (en) * | 2016-09-29 | 2017-01-18 | 深圳普智联科机器人技术有限公司 | Roadside parking space detection device and detecting method thereof |
| CN110595340A (en) * | 2019-07-09 | 2019-12-20 | 国网江苏省电力有限公司徐州供电分公司 | High-voltage overhead transmission line sag detection system based on field intensity change and detection method thereof |
| CN110926322A (en) * | 2019-09-30 | 2020-03-27 | 国网浙江省电力有限公司湖州供电公司 | Portable power transmission and distribution line sag detection device |
| CN113405473A (en) * | 2021-07-26 | 2021-09-17 | 贵州送变电有限责任公司 | High-precision sag observation equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103344170A (en) | High voltage transmission conductor sag measuring device and method | |
| CN104375090B (en) | Rechargeable lithium battery remaining capacity remote monitoring method | |
| CN108459244A (en) | Based on UHF and the united power cable partial discharge detecting systems of HFCT | |
| CN103149568B (en) | Radar-imaging-based wobbling state monitoring system for overhead line system | |
| IL140090A0 (en) | Method of and apparatus for measuring battery capacity | |
| CN202204614U (en) | Monitoring device for measuring lead wire sag and lead wire temperature of overhead transmission line | |
| CN105301507B (en) | The quick determination method and device of a kind of capacity of lead acid battery | |
| CN107340432A (en) | Grounding resistance data acquisition and analysis system based on wireless measurement module | |
| CN106353648A (en) | Comprehensive partial discharge monitoring device and method | |
| CN104122428A (en) | Electronic current transformer adopting optical fiber transmission analog signals | |
| CN103954242A (en) | Overhead-power-transmission-line sag online monitoring method based on UWB ranging technology | |
| CN104852096A (en) | Intelligent storage battery diagnosis and prediction system | |
| CN203688099U (en) | Cable temperature monitoring system based on surface acoustic wave and Zigbee technology | |
| CN102750799A (en) | Ion spatial electric current density-based direct current transmission line mountain fire monitoring device | |
| CN103983848B (en) | A kind of capacitor resonant tank early warning system based on capacitor branches monitoring point and method for early warning | |
| CN105758554A (en) | Power transmission line temperature online monitoring system and method, and application | |
| RU115582U1 (en) | ELECTRICAL TRANSMISSION REMOTE MONITORING DEVICE | |
| CN102508124B (en) | Detection method of partial discharge of electrical equipment | |
| CN204854813U (en) | Geological disaster monitoring system | |
| CN110244139A (en) | Remote high-voltage nuclear phase instrument based on GPRS | |
| CN110907743A (en) | Temperature and corona monitoring system for power transmission line cable and hardware fitting and working method thereof | |
| CN201270068Y (en) | Anti-theft device for 10KV transformer | |
| CN202711408U (en) | Ion spatial electric current density-based direct current transmission line mountain fire monitoring device | |
| CN204649833U (en) | A kind of shunting of the large ground network based on ZIGBEE wireless sense network phasor measuring set | |
| CN208805535U (en) | A kind of dynamic anti-electric theft monitoring system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20131009 |