CN107402327A - A kind of rotary more rapidly opened and closed devices of circuit - Google Patents
A kind of rotary more rapidly opened and closed devices of circuit Download PDFInfo
- Publication number
- CN107402327A CN107402327A CN201710651450.0A CN201710651450A CN107402327A CN 107402327 A CN107402327 A CN 107402327A CN 201710651450 A CN201710651450 A CN 201710651450A CN 107402327 A CN107402327 A CN 107402327A
- Authority
- CN
- China
- Prior art keywords
- slip ring
- circuit
- radial direction
- rotary
- brush
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of rotary more rapidly opened and closed devices of circuit, including commutation slip ring core and motor, slip ring is cased with commutation slip ring core, slip ring is connected with fixed brush, it is additionally provided with commutation slip ring core and moves brush with slip ring number identical, radial direction contact is provided with commutation slip ring core circumference, radial direction contact is fixed on the securing means, radial direction contact is connected with outside several test electrode cables arranged in measurand, the fixed brush successively with power circuit, signal acquisition circuit connects, signal acquisition circuit is connected with computer, computer and motor connection.Rotary more rapidly opened and closed devices of circuit of the present invention, without using the switching device of relay, overcome the inadequate root problem of circuit opening and closing speed, the problem of cross jamming, the relay noise pollution of wiring can also be avoided, opening and closing switching speed is related to controllable speed motor rotating speed, it is possible to achieve is quickly switched very much between test electrode and Acquisition Circuit, power supply circuit.
Description
Technical field
The present invention relates to rotary more rapidly opened and closed devices of circuit, belong to electrical conductivity (or resistivity) testing field.
Background technology
Resistivity or electrical conductivity are the important parameters of research material electrical properties, the extensive use in Geotechnical Engineering, especially
In the research of special soils, as swelled ground (Cui Kerui, Cha Fusheng, Liu Songyu, waits swelled ground water suctions of the based on resistivity method swollen
Structure change quantitative study [J] Geotechnical Engineering journal .2008,30 (12) during swollen:1832-1839；Miao Linchang, it is strict and impartial good,
Electrical resistivity property testing research [J] Geotechnical Engineering journal .2007,29 (9) of Cui Ying remolded expansive soils:1413-1417.), it is dirty
Dye soil (Han Pengju, Dong Xiaoqiang, white Xiao Hong, waits change in resistance research [J] geotechnical engineerings of the lower soil cement of .NaOH pollutions
Report .2007,29 (11):1715-1719. Han Li China, Liu Songyu, Du Yan army).When measurand is that size is smaller, it can be considered single
The situation of first yardstick, what its method of testing was more commonly used is to be tested (Liu Songyu, to look into Pu using four electrode method or two electrode methods
It is raw, in the technical research of resistivity indoor test [J] engineering geology journal .2006 of small army soil, 14 (02):216-222.), or
With reference to a kind of two electrode methods test (new methods for detecting Polluted Soil of Han Lihua, Liu Songyu, Du Yan army --- the electricity of electric bridge bridge
Resistance rate method [J] Geotechnical Engineering journal .2006,28 (8):1028-1032.), also there is the patent (one in terms of soil body resistivity measurement
Soil resistivity test device (the publication number of kind insulating materials：CN104166049A)).When testee is as a cell cube
During treating, above-mentioned method of testing and device disclosure satisfy that requirement.But when measurand has large-size, and its diverse location
Property change over time, and when changing very fast (change frequency is more than 1Hz), then, it is necessary to arrange multiple (usual in measurand
Be 4 or 2 it is several again) test electrode, it is desirable to realize test contact (and power contacts) with test electrode between being switched fast.
Multigroup test electrode is such as connected from measurand, intermittent contact company is corresponded between signal acquisition circuit and power supply circuit
Connect.I.e. this connection is dynamically to connect, and contact realizes quickly closure and disconnection process between electrode up and down.
Currently in order to realizing this function, it is readily apparent that using relay switch to realize, passes through automatic control relay
Switching function, realize this control function being connected and disconnected from.For test object change of properties it is slower or almost unchanged when,
Using control relay circuit, test request disclosure satisfy that.But when quick change occurs for the property of test object, it is necessary to electrode
Quickly switched very much between Acquisition Circuit, power supply circuit, test request could be met.Opened only with Control
Powered-down road can not meet to require.As the single relay most fast response time can reach 50 milliseconds or so, i.e., electrode with
Opening and closing can be realized between Acquisition Circuit, power supply circuit between 50 milliseconds.But it is more to test number of electrodes, if according to 40 meters
Calculate, between electrode and Acquisition Circuit, power supply circuit come and go run-down total time be：40/4 (individual/group) * (50 seconds) * 2=
1.0 the second.When being less than 1 second in the cycle of measurand change of properties, electrode scanning, which only comes and goes, to be scanned 1 time, tests acquisition
Data can not react the change of measurand property.Therefore when dynamic change occurs for measurand property, using relay control
Circuit processed can not meet the needs of object dynamic change test.
Further, since the switch motion control of more group relays needs to arrange more control circuits, electric energy, cost are wasted
Improve, and the switch of mechanical relay has more noise, influences the equipment quality of system.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, it is quick that the present invention provides a kind of rotary more circuits
Opening and closing device, the quickly opening and closing switching one by one between test electrode and signal test circuit (including power supply circuit) can be achieved,
Opening and closing switching speed is related to controllable speed motor rotating speed, overcomes the inadequate root problem of circuit opening and closing speed.
Technical scheme：In order to solve the above technical problems, a kind of rotary more rapidly opened and closed devices of circuit of the present invention, including
Commutated the motor that slip ring core and drive commutation slip ring core rotate, and at least two slip ring is cased with the commutation slip ring core, sliding
Ring is connected with fixed brush, is additionally provided with the commutation slip ring core and is moved brush with slip ring number identical, turned in commutation slip ring
Core circumference is provided with radial direction contact, and radial direction contact is fixed on the securing means, and radial direction contact is with outside positioned at cloth in measurand
Several test electrode cable connections put, the fixed brush are connected with power circuit, signal acquisition circuit successively, and signal is adopted
Collector is connected with computer, computer and motor connection.
Preferably, the commutation slip ring core is provided with circle convex platform, dynamic brush is evenly distributed in circle convex platform.
Preferably, the number of the radial direction contact is more than or equal in test object the number for the test electrode installed.
Preferably, the number of the radial direction contact is more than or equal to the number of dynamic brush, the number for moving brush is typically 4
It is individual.
Preferably, the dynamic brush has four, the computer is connected with the first transition card, the first transition card respectively with electricity
Machine is connected with power amplifier, and power amplifier is connected with current sensor, and current sensor is connected with a fixed brush, its
Its fixed brush and the second conversion card connection, the second transition card are connected with computer.
Preferably, the fixed brush is connected with the both ends of bridge circuit respectively, the feeder ear of bridge circuit passes through
Two transition cards are connected with computer, and the other end of bridge circuit is connected with power amplifier, and power amplifier and the first transition card connect
Connect, the first transition card is connected with motor and computer simultaneously.
Connected preferably, a test electrode connects no less than two radial direction contacts simultaneously.
In the present invention, according to 50 revolutions per seconds of calculating of stabilized (steady-state) speed controllable speed motor (such as stepper motor), the device
Time of all radial direction contacts and dynamic brush opening and closing circulation primary be 20 milliseconds, the radial direction installed in radial direction contact fixing device
For contact according to 20 calculating, the time being opened and closed once equivalent to each contact and dynamic brush is only 1 millisecond.The speed is either single
The opening and closing speed of individual electrode or the opening and closing cycle rate of all electrodes, all far above currently available technology.Rate controlling motor turns
Dynamic frequency is opened and closed frequency once with all M radial direction contacts, is contacted between single dynamic brush and single radial direction contact with not connecing
Tactile time T is the inverse of motor speed V and radial direction contact number M product, i.e. T=1/ (MV), or single circuit contact frequency is F
=MV.The frequency and measurement circuit end signal frequency acquisition F of power supply model occur for externally fed power end, and frequency is contacted with single circuit
Rate is identical.
Beneficial effect：Rotary more rapidly opened and closed devices of circuit of the present invention, without using the switching device of relay, so
The inadequate root problem of circuit opening and closing speed is overcome, the cross jamming of wiring, relay noise pollution can also be avoided to ask
Topic, opening and closing switching speed are related to controllable speed motor rotating speed, it is possible to achieve enter between test electrode and Acquisition Circuit, power supply circuit
Row very quickly switching.
Brief description of the drawings
Fig. 1 is the structural representation of apparatus of the present invention.
Fig. 2 is the structural representation of commutation slip ring core in the present invention.
Fig. 3 is the radial direction contact fixing device schematic diagram of the present invention.
Fig. 4 is the complete test philosophy figure of specific embodiment 1 in the present invention.
Fig. 5 is the complete test philosophy figure of specific embodiment 2 in the present invention.
Fig. 6 tests electrode and radial direction contact wiring diagram for specific embodiment 3 in the present invention.
In figure：(1)-commutation slip ring core；(2)-move brush；(3)-slip ring；(4)-boss；(5)-fixed brush；(6)-
Rate controlling motor；(7)-radial direction contact；(8)-radial direction contact fixing device；(9)-measurand；(10)-test electrode；(11)-electricity
Flow sensor；(12)-the first transition cards；(13)-power amplifier；(14)-computer；(15)-bridge circuit；(16)-rotary
More rapidly opened and closed device fixed supports of circuit；(17)-bearing.
Embodiment
As shown in Figures 1 to 6, a kind of rotary more rapidly opened and closed devices of circuit of the invention, including commutation slip ring core 1
With the motor 6 for driving commutation slip ring core 1 to rotate, commutation slip ring core 1 and motor 6 are rapidly opened and closed installed in rotary more circuits
On device fixed support 16,4 slip rings 3 are cased with the commutation slip ring core 1, slip ring 3 is connected with fixed brush 5, fixed electricity
Brush 5 is arranged on bearing 17, and being additionally provided with 4 dynamic brushes 2 on the commutation slip ring core 1 (for core spin balancing, can set and move
The symmetrical quantity identical exploring brush of brush position), commutation slip ring core 1 is provided with circle convex platform 4, and dynamic brush 2 is concentrated uniformly
It is distributed in circle convex platform 4, is provided with radial direction contact 7 in the commutation circumference of slip ring core 1, radial direction contact 7 is fixed on fixing device 8
On, radial direction contact 7 is connected with outside several test wires of electrode 10 arranged in measurand 9, of radial direction contact 7
Number is more than or equal in test object the number for the test electrode 10 installed, and the number of the radial direction contact 7 is more than or equal to dynamic brush 2
Number, the fixed brush 5 is connected with power circuit, signal acquisition circuit successively, and signal acquisition circuit is connected with computer 14,
Computer 14 is connected with rate controlling motor 6.
Embodiment 1：The saturated sand resistivity that rotary more rapidly opened and closed devices of circuit carry out four electrode method is surveyed
Examination.Complete test philosophy figure, as shown in Figure 4.
The rotary more rapidly opened and closed devices of circuit counted using M=24 radial direction contact 7, computer 14 control controlled motor 6
Rotating speed use V=40 revolutions per seconds.Measurand 9 is saturated sand, is positioned in the high rectangular vessel of H rice, the water of rectangular vessel
Plane section area is A.Under the effect of 1Hz oscillatory loads, different height opening position, resistivity (or electrical conductivity) hair of saturated sand
Raw real-time change.Embedded 10 quantity of test electrode N=20 in saturated sand different height position, the spacing tested between electrode 10
L=H/ (N-1) rice.(wherein have 4 radial direction contacts 7 vacant) is linked in sequence with wire and radial direction contact 7 for test electrode 10.It is dynamic
Brush 2 has four, and the computer 14 is connected with the first transition card 12, the first transition card 12 respectively with motor 6 and power amplifier
13 connection, the first transition card 12 be digital-to-analogue conversion card, and power amplifier 13 is connected with current sensor 11, current sensor 11 and
One fixed brush 5 is connected, and other fixed brushes 5 are connected with the second transition card, and the second transition card is analog-to-digital conversion card, and second
Transition card is connected with computer 14.Fixed brush 5 in the device is connected with signal acquisition circuit with power supply circuit respectively, and signal is adopted
Collector is connected with computer 14, passes through analog-digital converter real-time testing voltage.Power supply circuit is connected with current sensor 11, then is connected
Connect power amplifier, power amplifier is connected with digital analog converter, and with computer 14, the harmonic wave of output voltage model of computer 14 or step signal.Rate controlling
Motor 6 connects computer 14, controlled motor rotating speed by control circuit.
In this process, it is I to measure electric current by current sensor 11, measures the voltage between adjacent two tests electrode
For U, then the soil body resistivity between the adjacent test electrode 10 of saturated sand in rectangular vessel is obtained(electrical conductivity).In 1 second, all electrode tests 40 times in all saturated sands.In the soil body between any two electrode
Soil obtained 40 significant figure strong points in 1 second, met soil body dynamic test request.
It is 20 milliseconds of relay (being very high-end product) according to the response time, then all test electrodes 10 are swept
Retouching 1 time (only based on N=20 electrode) needs 0.4 second, and the soil between any two electrode obtained 5 data points in 2 seconds,
Dynamic test request can not be met completely.
Embodiment 2：The saturated sand resistivity that rotary more rapidly opened and closed devices of circuit carry out two electrode methods is surveyed
Examination.Complete test philosophy figure, as shown in Figure 5.The rotary more rapidly opened and closed dresses of circuit counted using M=36 radial direction contact 7
Put, computer 14 controls the rotating speed of controlled motor 6 to use V=30 revolutions per seconds.Measurand 9 is saturated sand, is stacked at rectangular vessel
In, it is H rice to stack height, and the horizontal section area of rectangular vessel is A.Under the effect of 1Hz oscillatory loads, different height position
Real-time change occurs for place, the resistivity (or electrical conductivity) of saturated sand.Test electrode 10 quantity N=is uniformly buried along short transverse
35, the spacing tested between electrode 10 is then L=H/ (N-1) rice.Fixed brush 5 connects with the both ends of bridge circuit 15 respectively
Connect, the feeder ear of bridge circuit 15 is connected by the second transition card with computer 14, the other end of bridge circuit 15 and power amplification
Device 13 is connected, and power amplifier 13 is connected with the first transition card 12, and the first transition card 12 is connected with motor 6 and computer 14 simultaneously.
Test electrode 10 with wire in order it is corresponding with radial direction contact 7 connect (wherein 7 vacancy of radial direction contact 1, such as
Shown in Fig. 2 Fig. 5).By moving brush 2, commutate radial direction contact 7 slip ring 3, fixed brush 5, and connects into electric bridge bridge
In one of bridge arm.The feeder ear of electric bridge bridge is to pass through exchange of the digital analog converter to power amplifier 13 by computer 14
Or step signal (frequency F=MV hertz).The test lead connection analog-digital converter of bridge, and connect computer 14 and gather digital letter
Number.
According to two electrode method test philosophies, the resistance R between two adjacent test electrodes 10 is obtained, adjacent electrode can be calculated
Between the resistivity of saturated sand be(electrical conductivity).In 1 second, all electrodes in all saturated sands
Test 30 times.Soil in the soil body between any two electrode obtained 30 significant figure strong points in 1 second, met soil body dynamic
Test request.
It is 20 milliseconds of relay (being very high-end product) according to the response time, then all test electrodes 10 are swept
Retouching 1 time (only based on N=30 electrode) needs 0.6 second, and the soil between any two electrode obtained 30 data in 5 seconds
Point, dynamic test request can not be met completely.
Specific embodiment 3：If test the resistivity measurement when quantity of electrode 10 is less than the half that radial direction contact 7 counts.
It is rapidly opened and closed less than the rotary more circuits made if the negligible amounts of test electrode 10 installed in test object
In device during the half of the quantity of radial direction contact 7, a test electrode 10 can connect two (or even three) radial direction contacts 7 simultaneously,
All other routes connected mode is identical with specific embodiment 1 or embodiment 2.Such as：It is 17 when testing the quantity of electrode 10, and
The quantity of radial direction contact 7 is 36, and uses two electrode method test resistance rates, then same test electrode 10 can connect two simultaneously
Symmetrical radial direction contact 7, as shown in Figure 6.
The advantage of the embodiment is：Under the identical speed conditions of rate controlling motor 6, the opening and closing circulation speed of test electrode 10
Rate doubles (being raising twice if three radial direction contacts 7 of test electrode 10 while connection connect), and need not adjust this
Individual core component, that is, expand the use range of rotary more rapidly opened and closed this core component of device of circuit.
Claims (7)
- A kind of 1. rotary more rapidly opened and closed devices of circuit, it is characterised in that：Including commutation slip ring core and drive commutation slip ring Core rotate motor, it is described commutation slip ring core on be cased with least two slip rings, slip ring is connected with fixed brush, the commutation It is additionally provided with slip ring core and moves brush with slip ring number identical, is provided with radial direction contact in commutation slip ring core circumference, radially Contact is fixed on the securing means, and radial direction contact connects with outside several test electrode cables arranged in measurand Connect, the fixed brush is connected with power circuit, signal acquisition circuit successively, and signal acquisition circuit is connected with computer, computer with Motor connection.
- 2. rotary more rapidly opened and closed devices of circuit according to claim 1, it is characterised in that：The commutation slip ring core Circle convex platform is provided with, dynamic brush, which is concentrated, to be evenly distributed in circle convex platform.
- 3. rotary more rapidly opened and closed devices of circuit according to claim 1, it is characterised in that：Of the radial direction contact Number is more than or equal in test object the number for the test electrode installed.
- 4. rotary more rapidly opened and closed devices of circuit according to claim 1, it is characterised in that：Of the radial direction contact Number is more than or equal to the number of dynamic brush.
- 5. rotary more rapidly opened and closed devices of circuit according to claim 1, it is characterised in that：The dynamic brush has four Individual, the computer is connected with the first transition card, and the first transition card is connected with motor and power amplifier respectively, power amplifier with Current sensor is connected, and current sensor is connected with a fixed brush, other fixed brushes and the second conversion card connection, the Two transition cards are connected with computer.
- 6. rotary more rapidly opened and closed devices of circuit according to claim 1, it is characterised in that：The fixed brush difference Be connected with the both ends of bridge circuit, the feeder ear of bridge circuit is connected by the second transition card with computer, bridge circuit it is another End is connected with power amplifier, and power amplifier is connected with the first transition card, and the first transition card is connected with motor and computer simultaneously.
- 7. rotary more rapidly opened and closed devices of circuit according to claim 1, it is characterised in that：One test electrode is simultaneously No less than two radial direction contacts of connection connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710651450.0A CN107402327A (en) | 2017-08-02 | 2017-08-02 | A kind of rotary more rapidly opened and closed devices of circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710651450.0A CN107402327A (en) | 2017-08-02 | 2017-08-02 | A kind of rotary more rapidly opened and closed devices of circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107402327A true CN107402327A (en) | 2017-11-28 |
Family
ID=60401904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710651450.0A Pending CN107402327A (en) | 2017-08-02 | 2017-08-02 | A kind of rotary more rapidly opened and closed devices of circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107402327A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082657A (en) * | 2019-05-30 | 2019-08-02 | 广东电网有限责任公司 | A kind of UAV system array-type sensor that can position corona discharge |
| CN114113706A (en) * | 2021-11-24 | 2022-03-01 | 江苏科技大学 | Soil body resistivity field dynamic change test system based on circuit rotation switching mode |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426039A (en) * | 2013-09-02 | 2015-03-18 | Ltn伺服技术有限责任公司 | Slip-ring unit and method for monitoring the condition of a slip-ring unit |
| CN204577263U (en) * | 2015-01-15 | 2015-08-19 | 南京日新科技有限公司 | The built-in on-load switch of a kind of electric motor type |
| CN204577262U (en) * | 2015-01-15 | 2015-08-19 | 南京日新科技有限公司 | The built-in on-load switch that a kind of printed board is installed |
| CN205562767U (en) * | 2016-03-30 | 2016-09-07 | 国家电网公司 | Test battery capacity's analog switch |
| US9666224B1 (en) * | 2016-02-23 | 2017-05-30 | Western Digital Technologies, Inc. | Data storage device adaptively estimating spindle motor current |
-
2017
- 2017-08-02 CN CN201710651450.0A patent/CN107402327A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426039A (en) * | 2013-09-02 | 2015-03-18 | Ltn伺服技术有限责任公司 | Slip-ring unit and method for monitoring the condition of a slip-ring unit |
| CN204577263U (en) * | 2015-01-15 | 2015-08-19 | 南京日新科技有限公司 | The built-in on-load switch of a kind of electric motor type |
| CN204577262U (en) * | 2015-01-15 | 2015-08-19 | 南京日新科技有限公司 | The built-in on-load switch that a kind of printed board is installed |
| US9666224B1 (en) * | 2016-02-23 | 2017-05-30 | Western Digital Technologies, Inc. | Data storage device adaptively estimating spindle motor current |
| CN205562767U (en) * | 2016-03-30 | 2016-09-07 | 国家电网公司 | Test battery capacity's analog switch |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082657A (en) * | 2019-05-30 | 2019-08-02 | 广东电网有限责任公司 | A kind of UAV system array-type sensor that can position corona discharge |
| CN114113706A (en) * | 2021-11-24 | 2022-03-01 | 江苏科技大学 | Soil body resistivity field dynamic change test system based on circuit rotation switching mode |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103140009A (en) | Langmuir multi-probe control circuit used for plasma diagnosis | |
| CN107402327A (en) | A kind of rotary more rapidly opened and closed devices of circuit | |
| CN202649448U (en) | Large user information collection terminal detection apparatus completely simulating scene | |
| CN101281222B (en) | Automatic monitoring system for tracking and erosion resistance of electric insulation material | |
| CN114966205B (en) | Insulation impedance detection method, device and system | |
| CN106872818A (en) | The grid-connected Performance Test System and method of a kind of smooth storing cogeneration device | |
| CN205691724U (en) | A kind of multistation test device of semiconductor components and devices | |
| CN103576121B (en) | A kind of intelligent electric meter perseverance magnetic detection system and its method | |
| CA2330580C (en) | Method and device for monitoring an electrode line of a bipolar high-voltage dc transmission system | |
| CN204101671U (en) | A kind of Novel multi-core cable tester | |
| CN205665317U (en) | Cable is to ground parameter testing appearance | |
| CN106772208A (en) | A kind of integrated reliability testing platform of single three-phase meter | |
| CN109655668A (en) | Electric installation dynamic contact resistance test method | |
| CN206594521U (en) | Large Copacity control system of wind turbines test platform | |
| CN101943744A (en) | Dry high-potential tester and solar simulation tool | |
| CN110244159A (en) | A kind of Multifunctional potentiometer Performance Test System | |
| CN109342972A (en) | Charging pile test equipment and alternating current and direct current charging pile test macro | |
| CN205665194U (en) | Insulator salt density detection device | |
| CN102274025A (en) | Multi-electrode electrical impedance tomography data acquisition system | |
| CN207753907U (en) | A kind of ion blower having automated cleaning ion needle function | |
| CN110082633A (en) | A kind of grounding net of transformer substation on-line monitoring system and method | |
| CN206331108U (en) | A kind of integrated reliability testing platform of single three-phase meter | |
| CN108037365A (en) | A kind of shunt reactor testboard | |
| CN107607221A (en) | A kind of current-carrying temperature rise experimental method and system for current conversion station tab terminal | |
| CN114235675A (en) | Corrosion monitoring system and method for engine exhaust system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171128 |