CN110736557A - data collector for passive wireless temperature transmission measuring system - Google Patents
data collector for passive wireless temperature transmission measuring system Download PDFInfo
- Publication number
- CN110736557A CN110736557A CN201911019522.5A CN201911019522A CN110736557A CN 110736557 A CN110736557 A CN 110736557A CN 201911019522 A CN201911019522 A CN 201911019522A CN 110736557 A CN110736557 A CN 110736557A
- Authority
- CN
- China
- Prior art keywords
- signal
- control module
- temperature
- passive wireless
- transmits
- 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
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/22—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects
- G01K11/26—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of resonant frequencies
- G01K11/265—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of resonant frequencies using surface acoustic wave [SAW]
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2612—Data acquisition interface
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Automation & Control Theory (AREA)
- Acoustics & Sound (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention provides data collectors for a passive wireless temperature transmission and measurement system, which comprise a signal transmission control module, a transceiving antenna control module, a return signal modulation module and a signal processing and control module, wherein the signal transmission control module transmits a detection signal to the transceiving antenna control module, the transceiving antenna control module sends the detection signal to an external surface acoustic wave passive wireless temperature sensor in an electromagnetic signal mode, the external surface acoustic wave passive wireless temperature sensor receives the detection signal and then sends a temperature signal to the transceiving antenna control module in an electromagnetic signal mode, the transceiving antenna control module transmits the temperature signal to the return signal modulation module, the return signal modulation module performs down-frequency processing on the temperature signal and transmits the decomposed I/Q signal to the signal processing and control module, and the signal processing and control module calculates the I/Q signal to obtain temperature data.
Description
Technical Field
The invention relates to the field of temperature monitoring, in particular to data collectors for a passive wireless temperature transmission and measurement system.
Background
Especially, China is in a period of economic rapid growth, the power supply load of national power grids is increasing day by day, and series safety problems are brought to the power distribution equipment while power supply is continuously expanded.
The switch cabinet plays an important role in the power transmission and distribution process, and the safety problem of the switch cabinet is very important for the normal operation of the whole power system. The traditional infrared temperature measurement, optical fiber temperature measurement and active wireless temperature measurement technologies have own defects when testing moving and static contacts of a switch frame and cable wiring contact points. The infrared temperature measurement precision is not high enough, and manual inspection is needed; the optical fiber temperature measuring optical fiber is easy to break, and the surface of the optical fiber temperature measuring optical fiber is easy to have a creepage phenomenon; active wireless temperature measurement requires battery replacement and is not the best temperature measurement option.
At present, the on-line temperature measurement technology of the common switch cabinet at home and abroad mainly comprises grating optical fiber temperature measurement, infrared temperature measurement, semiconductor digital temperature measurement, thermistor temperature measurement and sound surface temperature measurement. The problems existing in the current stage of various temperature measurement technologies are summarized as follows:
1. measuring the temperature by using the grating fiber: under the influence of accumulated dust or water vapor condensation, the creepage distance of the optical fiber is greatly reduced; the optical fiber is easy to break and break, belongs to a wired temperature measurement mode, is influenced by the structure of switch cabinet equipment, and has higher installation difficulty;
2. infrared temperature measurement, which is easily affected by environmental factors such as ambient temperature, humidity, dust in air, etc., the probe must be kept at a certain distance from the object to be measured.
3. Semiconductor digital temperature measurement: the environment with temperature resistance lower than 90 ℃ can be damaged, is not suitable for strong magnetic field and strong electric field environments, and is easy to be interfered.
4. Temperature measurement by a thermistor: special AD conversion and sampling circuits are needed, system insulation is easily affected, voltage and electromagnetic radiation interference are easily caused, voltage is easily induced, breakdown and damage are caused, and data processing is complex.
At present, no effective method is available for monitoring the temperature of a switch cabinet joint contact, as an alternative mode of monitoring, a low-efficiency and high-cost artificial infrared detection inspection mode is generally adopted, real-time temperature monitoring becomes the big problem of the current smart grid, an effective and reliable novel temperature monitoring mode is urgently needed, and temperature data collectors for passive wireless temperature transmission and measurement systems are urgently needed.
Disclosure of Invention
In order to solve the problems, the invention provides data collectors for a passive wireless temperature transmission measurement system.
The invention is realized by the following technical scheme:
the invention provides data collectors for a passive wireless temperature transmission and measurement system, which comprise a signal emission control module, a transceiving antenna control module, a return signal modulation module and a signal processing and control module, wherein the signal emission control module transmits a detection signal to the transceiving antenna control module, the transceiving antenna control module transmits the detection signal to an external surface acoustic wave passive wireless temperature sensor in an electromagnetic signal mode, the external surface acoustic wave passive wireless temperature sensor transmits a temperature signal to the transceiving antenna control module in an electromagnetic signal mode after receiving the detection signal, the transceiving antenna control module transmits the temperature signal to the return signal modulation module, the return signal modulation module performs down-frequency processing on the temperature signal and transmits the decomposed I/Q signal to the signal processing and control module, and the signal processing and control module calculates the I/Q signal to obtain temperature data.
, the data collector for passive wireless temperature transmission measurement system also includes a communication module, the signal processing and control module transmits the temperature data to the communication module.
, the signal emission control module includes a DDS chip, a filter, a LNA and a PA, the DDS chip generates an excitation signal, the excitation signal is synthesized by the DDS chip into a sine signal, the sine signal passes through a DAC and a band-pass filter in the DDS chip to form a detection signal and a local oscillation signal, and the detection signal passes through the filter, the LNA and the PA in sequence and is finally transmitted to the transceiving antenna control module.
, the receiving and dispatching antenna control module comprises a radio frequency antenna, the radio frequency antenna receives the detection signal from the DDS chip, the radio frequency antenna sends the detection signal to the passive wireless temperature sensor of outside surface acoustic wave in the mode of electromagnetic signal, and the passive wireless temperature sensor of outside surface acoustic wave sends the temperature signal to the radio frequency antenna in the mode of electromagnetic signal.
, the return signal modulation module includes a second filter, a second LNA, a quadrature modulator and a PLL chip, the radio frequency antenna transmits the temperature signal to the return signal modulation module, the temperature signal is sequentially transmitted to the second filter and the second LNA, and finally the temperature signal is subjected to down-frequency processing by the quadrature modulator, the quadrature modulator separates an I/Q signal from the temperature signal, and the local oscillator signal is transmitted to the quadrature modulator by the PLL chip.
And , the signal processing and control module comprises a DSP chip, the quadrature modulator transmits the I/Q signal to the DSP chip, an ADC is arranged in the DSP chip and samples, analyzes and calculates the temperature signal, and finally temperature data is obtained.
The invention has the beneficial effects that:
the data acquisition unit for the passive wireless temperature transmission measurement system has the advantages of high sensitivity and high signal-to-noise ratio, can realize long-term, real-time and stable detection of the temperature of a measured object by matching with the surface acoustic wave passive wireless temperature sensor, and is suitable for temperature detection systems in high-voltage and low-voltage power distribution.
Drawings
Fig. 1 is a schematic frame diagram of a data collector for a passive wireless temperature transmission measurement system according to the present invention.
Detailed Description
In order to more clearly and completely describe the technical solution of the present invention, the following describes the present invention with reference to the accompanying drawings in step .
Referring to fig. 1, the invention provides data collectors for a passive wireless temperature transmission measurement system, the data collectors for the passive wireless temperature transmission measurement system include a signal transmission control module 10, a transceiving antenna control module 20, a return signal modulation module 30 and a signal processing and control module 40, the signal transmission control module 10 transmits a detection signal to the transceiving antenna control module 20, the transceiving antenna control module 20 transmits the detection signal to an external surface acoustic wave passive wireless temperature sensor in an electromagnetic signal manner, the external surface acoustic wave passive wireless temperature sensor transmits a temperature signal to the transceiving antenna control module 20 in an electromagnetic signal manner after receiving the detection signal, the transceiving antenna control module 20 transmits the temperature signal to the return signal modulation module 30, the return signal modulation module 30 performs down-frequency processing on the temperature signal and transmits the decomposed I/Q signal to the signal processing and control module 40, and the signal processing and control module 40 calculates the I/Q signal to obtain temperature data.
In this embodiment, the signal transmission control module 10 is electrically connected to the transceiving antenna control module 20, the transceiving antenna control module 20 is electrically connected to the return signal modulation module 30, the return signal modulation module 30 is electrically connected to the signal processing and control module 40, and the signal processing and control module 40 is electrically connected to the signal transmission control module 10; the data acquisition unit for the passive wireless temperature transmission measurement system has the advantages of high sensitivity and high signal-to-noise ratio, can realize long-term, real-time and stable detection of the temperature of a detected object by matching with the surface acoustic wave passive wireless temperature sensor, and is suitable for temperature detection systems in high-voltage and low-voltage power distribution.
, the data collector for passive wireless temperature transmission measurement system further includes a communication module 50, and the signal processing and control module 40 transmits the temperature data to the communication module 50.
In this embodiment, be equipped with the MAX485 chip in the communication module 50, temperature data transmits to the MAX485 chip, and the MAX485 chip transmits temperature data to the display of outside through Modbus communication protocol and shows.
, the signal emission control module 10 includes a DDS chip 11, a filter 12, a LNA 13 and a PA 14, the DDS chip 11 generates an excitation signal, the excitation signal is synthesized by the DDS chip 11 into a sine signal, the sine signal is subjected to DAC and band-pass filtering in the DDS chip 11 to form a detection signal and a local oscillation signal, and the detection signal sequentially passes through the filter 12, the LNA 13 and the PA 14 and is finally transmitted to the transceiving antenna control module 20.
In this embodiment, the model of the DDS chip 11 is AD9958, the th LNA 13 is a th low noise amplifier, the PA 14 is a power amplifier, the DAC is a digital-to-analog converter, and the detection signal is filtered by the th filter 12, amplified by the th LNA 13 and the PA 14 in sequence, and finally transmitted to the transceiver antenna control module 20.
, the transceiving antenna control module 20 includes a radio frequency antenna 21, the radio frequency antenna 21 receives the detection signal from the DDS chip 11, the radio frequency antenna 21 sends the detection signal to the external surface acoustic wave passive wireless temperature sensor in the form of an electromagnetic signal, and the external surface acoustic wave passive wireless temperature sensor sends the temperature signal to the radio frequency antenna 21 in the form of an electromagnetic signal.
In this embodiment, the rf antenna 21 receives the temperature signal and transmits the temperature signal to the return signal modulation module 30.
, the return signal modulation module 30 includes a second filter 31, a second LNA 32, a quadrature modulator 33, and a PLL chip 34, the rf antenna 21 transmits the temperature signal to the return signal modulation module 30, the temperature signal is sequentially transmitted to the second filter 31 and the second LNA 32, and finally is down-frequency processed by the quadrature modulator 33, the quadrature modulator 33 separates the I/Q signal from the temperature signal, and the local oscillator signal is transmitted to the quadrature modulator 33 by the PLL chip 34.
In this embodiment, the second LNA 32 is: a second low noise amplifier; the model of the PLL chip 34 is: ADF 4360-7; the temperature signal is filtered by the second filter 31 and amplified by the second LNA 32; the PLL chip 34 is electrically connected to the DDS chip 11, the local oscillation signal is used as a fractional frequency divider to drive the PLL chip 34, and the PLL chip 34 is used as a local oscillation of the quadrature modulator 33.
Further , the signal processing and control module 40 includes a DSP chip 41, the quadrature modulator 33 transmits the I/Q signal to the DSP chip 41, an ADC 42 is disposed inside the DSP chip 41, and the ADC 42 samples, analyzes, and calculates the temperature signal to finally obtain temperature data.
In this embodiment, the types of the DSP chip 41 are: TMS320F28335 PGFA; the ADC 42 is: an analog-to-digital converter; the DSP chip 41 is electrically connected to the DDS chip 11, and the DSP chip 41 can control the DDS chip 11 to work.
Of course, the present invention may have other embodiments, and based on the embodiments, those skilled in the art can obtain other embodiments without any creative effort, and all of them are within the protection scope of the present invention.
Claims (6)
- The data acquisition unit for the passive wireless temperature transmission measurement system is characterized by comprising a signal emission control module, a transceiving antenna control module, a return signal modulation module and a signal processing and control module, wherein the signal emission control module transmits a detection signal to the transceiving antenna control module, the transceiving antenna control module transmits the detection signal to an external surface acoustic wave passive wireless temperature sensor in an electromagnetic signal mode, the external surface acoustic wave passive wireless temperature sensor transmits a temperature signal to the transceiving antenna control module in an electromagnetic signal mode after receiving the detection signal, the transceiving antenna control module transmits the temperature signal to the return signal modulation module, the return signal modulation module performs down-frequency processing on the temperature signal and transmits the decomposed I/Q signal to the signal processing and control module, and the signal processing and control module calculates the I/Q signal to obtain temperature data.
- 2. The data collector for the passive wireless temperature transmission and measurement system according to claim 1, further comprising a communication module, wherein the signal processing and control module transmits the temperature data to the communication module.
- 3. The data collector for the passive wireless temperature transmission measurement system according to claim 1, wherein the signal emission control module comprises a DDS chip, an th filter, a th LNA and a PA, the DDS chip generates an excitation signal, the excitation signal is synthesized into a sine signal by the DDS chip, the sine signal is subjected to DAC and band-pass filtering inside the DDS chip to form a detection signal and a local oscillation signal, and the detection signal sequentially passes through the th filter, the th LNA and the PA and is finally transmitted to the transceiving antenna control module.
- 4. The data collector for the passive wireless temperature transmission measurement system according to claim 3, wherein the transceiver antenna control module comprises a radio frequency antenna, the radio frequency antenna receives the detection signal from the DDS chip, the radio frequency antenna sends the detection signal to the external surface acoustic wave passive wireless temperature sensor in an electromagnetic signal manner, and the external surface acoustic wave passive wireless temperature sensor sends the temperature signal to the radio frequency antenna in an electromagnetic signal manner.
- 5. The data collector for the passive wireless temperature transmission measurement system according to claim 4, wherein the return signal modulation module comprises a second filter, a second LNA, a quadrature modulator, and a PLL chip; the radio frequency antenna transmits a temperature signal to the return signal modulation module, the temperature signal is sequentially subjected to the second filter and the second LNA, and finally subjected to down-frequency processing by the quadrature modulator, and the quadrature modulator decomposes an I/Q signal from the temperature signal; and the local oscillation signal is transmitted to the quadrature modulator through the PLL chip.
- 6. The data collector for the passive wireless temperature transmission and measurement system according to claim 5, wherein the signal processing and control module comprises a DSP chip, the quadrature modulator transmits I/Q signals to the DSP chip, an ADC is arranged in the DSP chip, and the ADC samples, analyzes and calculates temperature signals to finally obtain temperature data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911019522.5A CN110736557A (en) | 2019-10-24 | 2019-10-24 | data collector for passive wireless temperature transmission measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911019522.5A CN110736557A (en) | 2019-10-24 | 2019-10-24 | data collector for passive wireless temperature transmission measuring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110736557A true CN110736557A (en) | 2020-01-31 |
Family
ID=69271265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911019522.5A Pending CN110736557A (en) | 2019-10-24 | 2019-10-24 | data collector for passive wireless temperature transmission measuring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110736557A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113155306A (en) * | 2021-01-18 | 2021-07-23 | 国网吉林省电力有限公司长春供电公司 | Built-in passive wireless temperature sensor for high-voltage power cable connector |
| US12107611B2 (en) | 2020-12-11 | 2024-10-01 | Intel Corporation | Receiver with reduced noise figure using split LNA and digital combining |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103279777A (en) * | 2013-05-06 | 2013-09-04 | 西南交通大学 | Wireless surface acoustic wave temperature measurement system reader-writer |
| CN104142191A (en) * | 2014-08-22 | 2014-11-12 | 广东广特电气有限公司 | Online temperature measurement system of vacuum isolation circuit breaker |
| CN104990625A (en) * | 2015-06-18 | 2015-10-21 | 电子科技大学 | Wireless test circuit of resonant type surface acoustic wave sensor and test method |
| CN105222919A (en) * | 2015-10-23 | 2016-01-06 | 珠海黑石电气自动化科技有限公司 | A kind of passive wireless temperature sensor based on surface acoustic wave |
| CN206905931U (en) * | 2017-06-19 | 2018-01-19 | 中石化宁波工程有限公司 | Passive and wireless temperature on-line monitoring device |
| CN108344800A (en) * | 2018-01-17 | 2018-07-31 | 浙江大学 | System for detecting temperature based on wireless passive sonic surface wave sensor and receive-transmit system |
| CN207991604U (en) * | 2018-03-30 | 2018-10-19 | 山东映山红智能技术有限公司 | A kind of intelligent apparatus passive, radio detection for humiture |
| CN108809362A (en) * | 2018-07-17 | 2018-11-13 | 中国船舶重工集团公司第七〇九研究所 | A kind of wide bandwidth SAW reader emitter and its method |
| CN208254673U (en) * | 2018-05-17 | 2018-12-18 | 南方电网调峰调频发电有限公司 | Wireless temperature measuring device and In-Line Temperature Measure System |
-
2019
- 2019-10-24 CN CN201911019522.5A patent/CN110736557A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103279777A (en) * | 2013-05-06 | 2013-09-04 | 西南交通大学 | Wireless surface acoustic wave temperature measurement system reader-writer |
| CN104142191A (en) * | 2014-08-22 | 2014-11-12 | 广东广特电气有限公司 | Online temperature measurement system of vacuum isolation circuit breaker |
| CN104990625A (en) * | 2015-06-18 | 2015-10-21 | 电子科技大学 | Wireless test circuit of resonant type surface acoustic wave sensor and test method |
| CN105222919A (en) * | 2015-10-23 | 2016-01-06 | 珠海黑石电气自动化科技有限公司 | A kind of passive wireless temperature sensor based on surface acoustic wave |
| CN206905931U (en) * | 2017-06-19 | 2018-01-19 | 中石化宁波工程有限公司 | Passive and wireless temperature on-line monitoring device |
| CN108344800A (en) * | 2018-01-17 | 2018-07-31 | 浙江大学 | System for detecting temperature based on wireless passive sonic surface wave sensor and receive-transmit system |
| CN207991604U (en) * | 2018-03-30 | 2018-10-19 | 山东映山红智能技术有限公司 | A kind of intelligent apparatus passive, radio detection for humiture |
| CN208254673U (en) * | 2018-05-17 | 2018-12-18 | 南方电网调峰调频发电有限公司 | Wireless temperature measuring device and In-Line Temperature Measure System |
| CN108809362A (en) * | 2018-07-17 | 2018-11-13 | 中国船舶重工集团公司第七〇九研究所 | A kind of wide bandwidth SAW reader emitter and its method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12107611B2 (en) | 2020-12-11 | 2024-10-01 | Intel Corporation | Receiver with reduced noise figure using split LNA and digital combining |
| CN113155306A (en) * | 2021-01-18 | 2021-07-23 | 国网吉林省电力有限公司长春供电公司 | Built-in passive wireless temperature sensor for high-voltage power cable connector |
| CN113155306B (en) * | 2021-01-18 | 2023-11-10 | 国网吉林省电力有限公司长春供电公司 | Built-in passive wireless temperature-sensing sensor of high-voltage power cable joint |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110736557A (en) | data collector for passive wireless temperature transmission measuring system | |
| CN103675532A (en) | GIS (gas insulated switchgear) fault diagnosis device and GIS fault diagnosis method | |
| CN212648049U (en) | Integrated detection device for transformer and transformer | |
| CN202075376U (en) | GIS (gas-insulated switchgear) partial discharge monitoring device | |
| CN106772627A (en) | Wideband intellectuality long period crustal magnetotelluric measurement system | |
| CN106872066A (en) | A kind of integrated temp measuring system of cable and its temp measuring method | |
| CN101916647B (en) | Multiband measurement digital linear alternating current transformer and measuring method thereof | |
| CN103323641B (en) | The implementation method of electronic mutual inductor and electronic mutual inductor | |
| Upton et al. | Gated pipelined folding ADC-based low power sensor for large-scale radiometric partial discharge monitoring | |
| CN108680843A (en) | A kind of method for detection of partial discharge of switch cabinet based on Radio Transmission Technology | |
| WO2022083175A1 (en) | Track circuit outdoor device having non-contact voltage acquisition function | |
| CN213457212U (en) | Partial discharge detection device for high-voltage electrical equipment | |
| CN207009172U (en) | A kind of intelligent temperature measurement compound inslation subsystem based on SAW Temperature Sensors | |
| CN215956111U (en) | Centralized state monitoring system for power switch cabinet | |
| CN204389630U (en) | A kind of jamproof Portable partial discharge detector | |
| RU2224260C1 (en) | Automated system controlling and metering electric energy ( variants ) | |
| CN216246906U (en) | Passive wireless RFID chip switch board contact temperature measurement system | |
| CN104267320A (en) | High-voltage switch cabinet partial discharge monitoring system based on ultrahigh-frequency electromagnetic wave detection | |
| CN201425522Y (en) | On-line temperature measuring system for equipotential junctions | |
| CN204330902U (en) | A kind of GIS trouble-shooter | |
| CN203705594U (en) | 10V switch cabinet internal discharge detector based on electromagnetic wave antenna reception array | |
| CN110554291A (en) | Partial discharge signal envelope detection device | |
| Zhang et al. | Research on partial discharge state detection in GIS based on Internet of Things technology | |
| CN203732962U (en) | Real-time wireless temperature monitoring system | |
| CN212622821U (en) | Transmission line shaft tower ground resistance measuring device |
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: 20200131 |