CN101694395A - Flow measuring and transmitting device of dam infiltration flow of reservoir - Google Patents
Flow measuring and transmitting device of dam infiltration flow of reservoir Download PDFInfo
- Publication number
- CN101694395A CN101694395A CN200910174812A CN200910174812A CN101694395A CN 101694395 A CN101694395 A CN 101694395A CN 200910174812 A CN200910174812 A CN 200910174812A CN 200910174812 A CN200910174812 A CN 200910174812A CN 101694395 A CN101694395 A CN 101694395A
- Authority
- CN
- China
- Prior art keywords
- flow
- microprocessor
- weir
- primary coil
- guide rod
- 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 flow measuring and transmitting device of dam infiltration flows of a reservoir, comprising a field measuring unit and an indoor receiving unit, wherein the field measuring unit comprises a flow measuring device and a transmission circuit, the flow measuring device comprises a triangular flow measuring weir, a triangular residue separating drum, a floater, a guide rod, a guide ring and a differential transformer; the triangular flow measuring weir is embedded into an infiltration flow open canal water-retaining weir to be connected with the floater; the floater is fixedly connected with the guide rod; the guide rod is connected with a movable armature iron; the differential transformer comprises a secondary winding, a primary coil winding and the movable armature iron and is coupled with a device with coefficient changed along with the up-and-down movement of the armature iron, wherein the movable armature iron is positioned between the secondary winding and the primary coil winding and moves up and down along with the lifting of the floater; the floater has very reliable work when used as a device for detecting a liquid level without being influenced by the canal bottom sullage of an infiltration flow weir, weather and temperature; and the differential transformer is sensitive and durable, has high precision and is widely used for measuring physical quantities such as distances, displacements, and the like in the industrial production process.
Description
Technical field:
The present invention relates to a kind of measurement mechanism of flow, particularly relate to a kind of measurement transmitting device of reservoir dam seepage flow flow.
Background technology
In the middle-size and small-size reservoir of China's One's name is legion, great majority all last century 50～the seventies build up with native, building stones.Because the compaction rate of earth and rockfill dam body self is limited, the total seepage that exists in various degree of dam.When the reservoir upper pond level changed, the discharge that leaks out from dam body also can and then change.Operation reservoir for many years, its dam body inside is gradually all even stable, so this seepage flow also tends towards stability with the rule that upper pond level changes.Therefore, the size of seepage flow just becomes weighs the whether important indicator of safe operation of this reservoir dam, according to national reservoir earth and rockfill dam safety monitoring standard, water reservoir management person must observe the dam infiltration flow every day and converge into form, form historical archives, reservoir engineering ruuning situation is carried out analysis-by-synthesis with this.
The automatic detection of seepage flow at present mainly contains weir formula flow measurement plates such as adopting restriction device such as triangle sharp-crested weir, Cipolletti weir and adopts the slot type work current surveying machine of Bashel groove, and these devices all are to rely on the measuring liquid level height to measure flow indirectly.According to hydraulic principle, the flow and the crest of weir head height that flow through crest of weir or notch satisfy certain single valued relation, so only need measure the head height of crest of weir, just can calculate the seepage flow of dam.It is available that at present the product sensor of measuring liquid level mainly contains pressure resistance type, ultrasonic type, magnetostriction type.The two kinds of product prices in back are very high, and are still difficult for applying on a large scale, and preceding a kind of product only could guarantee measuring accuracy preferably as under the situation more than 3 meters greatly in range ratio, and precision is then not ideal enough when a small amount of journey.Because the depth of water in the reservoir seepage flow open channel usually less than 1 meter, will exist than mistake if at this moment go to measure with the pressure resistance type liquid level sensor; On the other hand, the seepage flow open channel all in the open air, harsh and unforgiving environments such as measurement mechanism must weather, Exposure to Sunlight, thunder and lightning.The pressure resistance type liquid level sensor is owing to the cause of self structure, and the probability that damages after suffering indirect lightning strike is bigger, and this makes the cost risk of device later maintenance increase.
Summary of the invention:
The objective of the invention is to overcome the shortcoming of prior art, the measurement transmitting device of the reservoir dam seepage flow flow that a kind of cost is low, durability good and precision is high is provided.
The present invention has adopted the differential transformer that is widely used for Displacement Measurement and distance in industrial processes, have characteristics highly sensitive, that precision is good, cooperate with mechanical component such as float, lever, magnetic core and ironcore choke parts by differential transformer, durability is good, even being subjected to indirect lightning strike can not damage yet, reduced device later maintenance workload, established good basis for saving cost.
Purpose of the present invention is achieved through the following technical solutions:
A kind of reservoir dam seepage flow flow measurement transmitting device comprises in-site measurement unit and indoor receiving element; Described in-site measurement unit comprises flow measurement device and transmission circuit; Described flow measurement device comprises triangle flow gaging weir, anti-slag tube, float, guide rod, guide ring and differential transformer; Described triangle flow gaging weir embeds in the seepage flow open channel overfall and is connected with float, and float and guide rod are affixed, and guide rod is connected with removable armature;
Described differential transformer comprises; Secondary winding, primary coil winding and removable armature are that a coupling coefficient moves up and down along with armature and the device that changes; The primary coil winding has two windings that the number of turn is identical, with being connected; The secondary winding has two windings that the number of turn is identical, the anti-phase differential connection that is connected to form; Secondary winding and primary coil winding all are wound on the magnetic core; The removable armature identical with the magnetic core material moves up and down with the float lifting between secondary winding and primary coil winding;
Described transmission circuit comprises sine-wave generator, power amplifier, displacement signal phase-sensitive rectifier, wave filter, zeroing and modulation circuit, A/D converter, first microprocessor, seepage flow LCDs, RS-485 bus logic circuit and DC-DC supply convertor; Described primary coil winding is connected with sine-wave generator by power amplifier; Be connected with the signal phase-sensitive rectifier after two secondary winding differential concatenations, the output and the wave filter of phase-sensitive rectifier join, and the output of wave filter is connected with modulation circuit with zeroing; The input of DC-DC supply convertor connects the external power source bus; One end of A/D converter is connected with modulation circuit with zeroing, and the other end links to each other with first microprocessor; The seepage flow LCDs all is connected with microprocessor with the RS-485 bus logic circuit;
Indoor unit comprises LCD, second microprocessor, D.C. regulated power supply and the 2nd RS-485 bus logic circuit; Described D.C. regulated power supply+24V powers to field unit through external bus, and second microprocessor is connected with the 2nd RS-485 bus logic circuit with LCD respectively.
For further realizing the object of the invention, described guide rod passes guide ring and is connected with removable armature.
Described float and guide ring are positioned at anti-slag tube, and guide ring and anti-slag tube all are fixed on the sidewall of weir canal.
Described in-site measurement unit is sealed in the waterproof aluminium box.
The described first microprocessor and second microprocessor are selected AT89C51 type microprocessor for use.
The present invention has following advantage and good effect:
(1) float is very reliable as the device work that detects liquid level, and it is not subjected to the influence of mud at the bottom of the canal of seepage flow weir, is not subjected to the weather Temperature Influence yet.
(2) the float material is plastics or stainless steel, uses not corrosion not damage for a long time.
(3) differential transformer is sensitive and durable, precision is high, and it is widely used in measuring physical quantitys such as distance in the industrial processes and displacement.
(4) on-the-spot and indoor unit design has the RS-485 bus logic circuit, dam infiltration amount signal can be transferred to administrative center and show and store, and forms the historical data archives, and managerial personnel can analyze reservoir dam ruuning situation in view of the above.
Description of drawings
Fig. 1 is the measurement mechanism structural representation of the measurement transmitting device of reservoir dam seepage flow flow.
Fig. 2 is the transmission circuit block diagram.
Fig. 3 is the transmission circuit electrical schematic diagram.
Fig. 4 is indoor receiving element electrical schematic diagram.
Embodiment:
For further understanding the principle of work of device, the present invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1, a kind of reservoir dam seepage flow flow measurement transmitting device is made up of in-site measurement unit and indoor receiving element.The in-site measurement unit comprises flow measurement device 9 and transmission circuit.Flow measurement device comprises triangle flow gaging weir 1, anti-slag tube 2, float 3, guide rod 4, guide ring 5 and differential transformer 9; Transmission circuit comprises sine-wave generator 12, power amplifier 10, displacement signal phase-sensitive rectifier 11, wave filter 13, zeroing and modulation circuit 16, A/D converter 17, first microprocessor 14, seepage flow LCDs 15, RS-485 bus logic circuit 18, DC-DC supply convertor 19 and electric circuit board.
Triangle flow gaging weir 1 embeds in the seepage flow open channel overfall, and float 3 and guide rod 4 are affixed, and guide rod 4 passes guide ring 5 and is connected with the removable armature 6 of differential transformer.Float 3 and guide ring 5 are positioned at anti-slag tube 2, and guide ring 5 and anti-slag tube 2 all are fixed on the sidewall of weir canal.Differential transformer 9 comprises removable armature 6, secondary winding 7 and primary coil winding 8, is that a coupling coefficient moves up and down along with armature and the device that changes.Primary coil winding 8 has two windings that the number of turn is identical, with being connected; Secondary winding 7 also has two windings that the number of turn is identical, the anti-phase differential connection that is connected to form; Secondary winding 7 and primary coil winding 8 all are wound on the magnetic core.Removable armature 6 is between secondary winding 7 and primary coil winding 8, removable armature 6 is identical with the magnetic core material, move up and down with the float lifting, the removable armature 6 and the air gap of magnetic core are changed, and then the coupling coefficient of change differential transformer, cause moving transformer secondary winding 7 output voltages to change, thereby the change-detection of liquid level is come out.Primary coil winding 8 is connected with sine-wave generator 12 by power amplifier 10, and power amplifier 10 constitutes the sine wave drive circuit with sine-wave generator 12; Be connected with signal phase-sensitive rectifier 11 after two secondary winding differential concatenations, the output of phase-sensitive rectifier 11 and wave filter 13 join, the output of wave filter 13 is connected with modulation circuit 16 with zeroing, and obtains and the proportional voltage signal of liquid level on sample resistance.The input of DC-DC supply convertor 19 connects external power source bus 20, and its output is+5V voltage, partly provides direct supply to each electricity consumptions such as integrated circuit.One end of A/D converter 17 is connected with modulation circuit 16 with zeroing, and the other end links to each other with first microprocessor 14.Seepage flow LCDs 15 all is connected with microprocessor with RS-485 bus logic circuit 18; The in-site measurement unit is sealed in the waterproof aluminium box.
As shown in Figure 3, differential transformer 9 is by electromagnetic induction principle work, provides amplitude and the frequency all will very stable sine wave exciting signal must for former limit winding, and this task is finished by differential transformer integrated circuit (IC) chip NE552021.Sine-wave generator 12, power amplifier 10 and displacement signal phase-sensitive rectifier 11 have been comprised in this integrated circuit (IC) chip 21.The tenth capacitor C 10 is used for adjusting sinusoidal wave concussion frequency among Fig. 3, and second resistance R 2, the 6th capacitor C 6 are formed phase-shift circuit, make the reference signal of phase-sensitive rectifier consistent with the input signal phase place, thereby improve circuit performance.Second resistance R 2, the 3rd resistance R 3, the 8th capacitor C 8, the 9th capacitor C 9 constitute the second order active low-pass filter with the auxiliary operation amplifier of integrated circuit (IC) chip NE5520 21 inside, and the output signal of displacement signal phase-sensitive rectifier 11 is carried out effective filtering.
Voltage comprises first operational amplifier A 1, second operational amplifier A 2 and the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 and sample resistance RL, and the output voltage of displacement signal phase-sensitive rectifier 11 is transformed into current signal.The 5th resistance R 5 can be regulated the range of output current among the figure, also promptly regulates the maximum height of liquid level change, the zero-bit that the first potentiometer W1 is used for regulating output current, the i.e. minimum value of liquid level change.The 8th resistance R 8, the 9th resistance R 9, the 5th capacitor C 5, voltage stabilizing diode VZ2 provide stable benchmark for the zero-bit adjustment.The input signal of A/D converter 17 under the control of first microprocessor 14, is finished the conversion work from the simulating signal to the numeric data just from the voltage on the sample resistance RL, and reads in the first microprocessor 14 and handle.Convert engineering unit to---behind the seepage flow flow, transformation result-aspect send on-the-spot liquid crystal display 15 (OCMC2X20) to show, give RS-485 bus logic circuit 18 on the other hand and be sent to the receiving element of administrative center, for managerial personnel's analyzing and processing via the external bus cable.
DC-DC supply convertor 19 is made of jointly first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, schottky diode VZ1, switch voltage-stabilizing integrated circuit (IC) 1, be responsible for administrative center send here+the 24V direct supply becomes+5V, so that working power is provided for the each several part circuit.
For reducing circuit power consumption, switch voltage-stabilizing integrated circuit (IC) 1 optional switch voltage-stabilizing integrated circuit LM567-5.0, the optional TD1-200 type of differential transformer model, drive integrated circult IC6 model is selected NE5520, the A/D converter model is selected TLC549, first microprocessor IC3 model is selected the AT89C51 type for use, the model of first operational amplifier A 1 and second operational amplifier A 2 is all selected the TL082 type for use, the RS-485 bus logic circuit selects MAX1487, and the LCD types of on-the-spot liquid crystal display 15 is OCMC2X20.
As shown in Figure 4, indoor unit comprises that LCD 22, second microprocessor 23, D.C. regulated power supply 24, the 2nd RS-485 bus logic circuit 25 form jointly.Wherein D.C. regulated power supply+24V powers to field unit through external bus, second microprocessor 23 is connected with the 2nd RS-485 bus logic circuit 25 with LCD 22 respectively, the process of control communication, communicate with field unit by two RS-485 bus logic circuits 25, receive on-the-spot seepage flow data, give LCD 22 then and show.Indoor receiving element is positioned at monitoring center, and the selection of its components and parts is consistent with field unit, and wherein LCD 22 is used OCMC2X20, second microprocessor, 23 same first microprocessors.
From the monitoring center to the scene, must lay two cables so that carry power supply and transmit signal.These two outdoor cables must pass coating steel pipe protection, and steel pipe and the junction of steel pipe should do conduction and is connected, and the threading steel pipe must buried-pipe laying, and are connected with protecting the earth polar suitably local, cause damage to prevent the induction lightening drawing-in system.
The present invention can implement by following step: 1. build an overfall on reservoir dam seepage flow open channel, open the breach of an about deeply 400mm of wide about 300mm in the middle of the body of weir.2. according to reservoir dam seepage flow situation, make a triangular form flow measurement weir plate, and this weir plate is embedded in the above-mentioned overfall with corrosion resistant plate.3. install mechanisms such as on-the-spot anti-slag tube, float, guide rod, guide ring by Fig. 1.4. make electric circuit board by in-site measurement unit electrical schematic diagram shown in Figure 3, and each element among the figure is welded on the electric circuit board.5. make electric circuit board by indoor receiving element electrical schematic diagram shown in Figure 4, and each element among the figure is welded on the electric circuit board.6. from the scene to the administrative center, dig a trench about dark 30cm, the jacketed cable of being with shielding is passed coating steel pipe guide to administrative center from the scene, the junction of noting steel pipe and steel pipe will guarantee good conductive, so that play the effect of shielding induction lightening, at last with threading steel pipe landfill.7. write the microprocessor work program of field unit and receiving element respectively and connect the machine debugging.The system that finishes after the above-mentioned work operation that can power on.
Claims (5)
1. a reservoir dam seepage flow flow measurement transmitting device comprises in-site measurement unit and indoor receiving element; Described in-site measurement unit comprises flow measurement device and transmission circuit; It is characterized in that: described flow measurement device comprises triangle flow gaging weir, anti-slag tube, float, guide rod, guide ring and differential transformer; Described triangle flow gaging weir embeds in the seepage flow open channel overfall and is connected with float, and float and guide rod are affixed, and guide rod is connected with removable armature;
Described differential transformer comprises; Secondary winding, primary coil winding and removable armature are that a coupling coefficient moves up and down along with armature and the device that changes; The primary coil winding has two windings that the number of turn is identical, with being connected; The secondary winding has two windings that the number of turn is identical, the anti-phase differential connection that is connected to form; Secondary winding and primary coil winding all are wound on the magnetic core; The removable armature identical with the magnetic core material moves up and down with the float lifting between secondary winding and primary coil winding;
Described transmission circuit comprises sine-wave generator, power amplifier, displacement signal phase-sensitive rectifier, wave filter, zeroing and modulation circuit, A/D converter, first microprocessor, seepage flow LCDs, RS-485 bus logic circuit and DC-DC supply convertor; Described primary coil winding is connected with sine-wave generator by power amplifier; Be connected with the signal phase-sensitive rectifier after two secondary winding differential concatenations, the output and the wave filter of phase-sensitive rectifier join, and the output of wave filter is connected with modulation circuit with zeroing; The input of DC-DC supply convertor connects the external power source bus; One end of A/D converter is connected with modulation circuit with zeroing, and the other end links to each other with first microprocessor; The seepage flow LCDs all is connected with microprocessor with the RS-485 bus logic circuit;
Indoor unit comprises LCD, second microprocessor, D.C. regulated power supply and the 2nd RS-485 bus logic circuit; Described D.C. regulated power supply+24V powers to field unit through external bus, and second microprocessor is connected with the 2nd RS-485 bus logic circuit with LCD respectively.
2. reservoir dam seepage flow flow measurement transmitting device according to claim 1 is characterized in that: described guide rod passes guide ring and is connected with removable armature.
3. reservoir dam seepage flow flow measurement transmitting device according to claim 1, it is characterized in that: described float and guide ring are positioned at anti-slag tube, and guide ring and anti-slag tube all are fixed on the sidewall of weir canal.
4. reservoir dam seepage flow flow measurement transmitting device according to claim 1, it is characterized in that: described in-site measurement unit is sealed in the waterproof aluminium box.
5. reservoir dam seepage flow flow measurement transmitting device according to claim 1, it is characterized in that: the described first microprocessor and second microprocessor are selected AT89C51 type microprocessor for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910174812A CN101694395A (en) | 2009-10-16 | 2009-10-16 | Flow measuring and transmitting device of dam infiltration flow of reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910174812A CN101694395A (en) | 2009-10-16 | 2009-10-16 | Flow measuring and transmitting device of dam infiltration flow of reservoir |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101694395A true CN101694395A (en) | 2010-04-14 |
Family
ID=42093380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910174812A Pending CN101694395A (en) | 2009-10-16 | 2009-10-16 | Flow measuring and transmitting device of dam infiltration flow of reservoir |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101694395A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806608A (en) * | 2010-04-21 | 2010-08-18 | 太原科技大学 | Seepage flow and seepage pressure monitoring device |
| CN102296572A (en) * | 2011-06-23 | 2011-12-28 | 中国水电顾问集团华东勘测设计研究院 | Earth and rockfill dam body seepage monitoring structure provided with abandoned dreg site behind dam and construction method thereof |
| CN102435230A (en) * | 2011-08-26 | 2012-05-02 | 中国农业大学 | Slope plot runoff flow measurement system of triangular weir |
| CN105352567A (en) * | 2015-11-27 | 2016-02-24 | 河南华润电力首阳山有限公司 | Mechanical slag removal system and liquid level measurement device thereof |
| CN105675090A (en) * | 2016-01-15 | 2016-06-15 | 湖州师范学院 | Coil-induced cork floating body water leakage detection mechanism |
| CN106014482A (en) * | 2016-07-08 | 2016-10-12 | 山东新河矿业有限公司 | Sensor positioning device for dynamically monitoring underground water of coal mine |
| TWI564549B (en) * | 2015-07-08 | 2017-01-01 | 桓達科技股份有限公司 | Radar liquid level measuring apparatus and radar liquid level measuring method |
| CN111912469A (en) * | 2020-06-28 | 2020-11-10 | 沈阳北星仪表制造有限公司 | LZP flowmeter and flow calculation method |
| CN112185673A (en) * | 2020-09-02 | 2021-01-05 | 中铁第一勘察设计院集团有限公司 | Voltage stabilizing transformer based on self-adaptive on-load tap-changer |
-
2009
- 2009-10-16 CN CN200910174812A patent/CN101694395A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806608A (en) * | 2010-04-21 | 2010-08-18 | 太原科技大学 | Seepage flow and seepage pressure monitoring device |
| CN101806608B (en) * | 2010-04-21 | 2011-08-24 | 太原科技大学 | Seepage flow and seepage pressure monitoring device |
| CN102296572A (en) * | 2011-06-23 | 2011-12-28 | 中国水电顾问集团华东勘测设计研究院 | Earth and rockfill dam body seepage monitoring structure provided with abandoned dreg site behind dam and construction method thereof |
| CN102435230A (en) * | 2011-08-26 | 2012-05-02 | 中国农业大学 | Slope plot runoff flow measurement system of triangular weir |
| TWI564549B (en) * | 2015-07-08 | 2017-01-01 | 桓達科技股份有限公司 | Radar liquid level measuring apparatus and radar liquid level measuring method |
| CN105352567A (en) * | 2015-11-27 | 2016-02-24 | 河南华润电力首阳山有限公司 | Mechanical slag removal system and liquid level measurement device thereof |
| CN105675090A (en) * | 2016-01-15 | 2016-06-15 | 湖州师范学院 | Coil-induced cork floating body water leakage detection mechanism |
| CN106014482A (en) * | 2016-07-08 | 2016-10-12 | 山东新河矿业有限公司 | Sensor positioning device for dynamically monitoring underground water of coal mine |
| CN106014482B (en) * | 2016-07-08 | 2018-07-17 | 山东新河矿业有限公司 | Sensor locator for underground coal mine water dynamic monitoring |
| CN111912469A (en) * | 2020-06-28 | 2020-11-10 | 沈阳北星仪表制造有限公司 | LZP flowmeter and flow calculation method |
| CN112185673A (en) * | 2020-09-02 | 2021-01-05 | 中铁第一勘察设计院集团有限公司 | Voltage stabilizing transformer based on self-adaptive on-load tap-changer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101694395A (en) | Flow measuring and transmitting device of dam infiltration flow of reservoir | |
| CN201307238Y (en) | Intelligent detection and control system for rod-pumped wells | |
| CN201514237U (en) | Device for measuring seepage flow of dam of reservoir | |
| CN203759859U (en) | Deep foundation pit deformation wireless test device and deep foundation pit deformation test system | |
| CN201903348U (en) | Monitoring device for soil displacement and pore water pressure of seabed | |
| CN208000117U (en) | A kind of mangneto electrical measurement sedimentometer | |
| CN107525566A (en) | A kind of sewage piping lane monitoring system | |
| CN101241156A (en) | Method for loading direct current mutual-inductor for applying to converter transformer bias magnet monitoring | |
| CN110455237A (en) | A kind of ice layer thickness automatic detection device and method | |
| CN211178667U (en) | Water conservancy reservoir monitoring devices | |
| CN204286502U (en) | A kind of chemical grouting self recording apparatus | |
| CN104596477A (en) | Transformer substation foundation settlement monitoring method | |
| CN209085710U (en) | A kind of online remote supervision system of drainage pipeline networks liquid level | |
| CN104390144A (en) | Urban sewerage system trench terminal beneficial to installation | |
| CN204788496U (en) | Portable multi -functional ground water level measuring device | |
| CN207976142U (en) | A kind of magnetic resistance electrical measurement sedimentometer | |
| CN203929060U (en) | A kind of inductance type intelligence static level instrument apparatus | |
| CN106225833A (en) | A kind of novel Dam Safety Monitoring Automation measure and control device | |
| CN204719111U (en) | A kind of low-power consumption photoelectric hybrid ultra-high-tension power transmission line current sensing means | |
| CN104266741A (en) | Calibrating platform and calibrating method used for aeolian vibration sensor of electric transmission line | |
| CN108680138A (en) | Soft soil foundation roadbed large deformation settlement automatic monitoring system and method | |
| CN209556000U (en) | A kind of monitoring device for Excavation Settlement | |
| CN101382449B (en) | Seepage line measuring set for two-wire system reservoir dam | |
| CN105352562A (en) | Induction type servo liquid metal liquid level measurement device and method | |
| CN104238525A (en) | Monitoring device of passive drainage 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 | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100414 |