CN214040387U - Wireless passive temperature measurement system - Google Patents
Wireless passive temperature measurement system Download PDFInfo
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- CN214040387U CN214040387U CN202022572897.9U CN202022572897U CN214040387U CN 214040387 U CN214040387 U CN 214040387U CN 202022572897 U CN202022572897 U CN 202022572897U CN 214040387 U CN214040387 U CN 214040387U
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Abstract
The utility model relates to a wireless passive temperature measurement system, including at least one read write line and with a set of temperature measurement unit at least of read write line complex. The group of temperature measuring units comprises a plurality of temperature sensors arranged on each temperature measuring point on site, at least one antenna arranged on site and capable of radiating all the temperature sensors of the group, and at least one radio frequency line arranged in one-to-one correspondence with the antenna. The reader-writer sends the ultrahigh frequency electromagnetic wave to the antenna through the radio frequency line, and the antenna radiates the received ultrahigh frequency electromagnetic wave outwards. The temperature sensors receive and reflect the ultrahigh frequency electromagnetic waves transmitted by the group of antennas, and the group of antennas receive electromagnetic wave signals reflected by the temperature sensors; the reflected electromagnetic wave signal reflects the temperature value change condition of the electrical equipment. The remote monitoring module monitors the temperature condition of the field electrical equipment in real time, and if the temperature of the temperature measuring point exceeds a threshold value, early warning information is sent to the remote monitoring module.
Description
Technical Field
The utility model relates to a wireless passive temperature measurement system belongs to the electric wire netting automation field.
Background
Important equipment such as a high-voltage switch cabinet, a ring main unit, a high-voltage cable joint and a disconnecting link switch of an electric power system can have the problems of equipment aging, surface oxidation, corrosion, loosening of fastening bolts and the like in long-term operation, and the temperature is easily increased abnormally. If the treatment is not discovered in time, the safety accidents such as melting, burning and even explosion can be caused. Based on the electrical characteristics of the power equipment, the temperature measurement system is required to collect the temperature in a passive and wireless mode, and meanwhile, the temperature measurement system is required to record the temperature of key nodes (such as a busbar, a movable contact, a static contact, a plug and the like) of the equipment in real time and perform safety early warning on the basis of big data analysis.
The existing wireless passive temperature sensors are mainly divided into the following three types:
the first is LC resonant temperature sensor, and the working principle is as follows: the change of temperature causes the magnetic parameter of the sensitive material in the circuit to change, thereby causing the change of inductance value. The inductance is inversely proportional to the resonant frequency, so that the change of the resonant frequency represents the change of the temperature. The resonant frequency is measured and communicated wirelessly. The LC resonance type temperature sensor has simple structure, reliable cavity and easy processing, but the magnetic field is absorbed to form eddy current when being close to the metal surface, thereby influencing the accuracy of the measuring structure and the signal transmission distance.
The second type is a surface acoustic wave (SVW) temperature sensor, and the working principle is as follows: the surface acoustic wave temperature sensor converts a received electromagnetic wave signal into a surface acoustic wave signal to sense temperature, converts the surface acoustic wave signal containing temperature information into an electromagnetic wave signal, sends the electromagnetic wave signal to receiving equipment, and obtains the temperature of a measured object through analysis and processing. Refer to patent "a wireless passive surface acoustic wave sensor for cubical switchboard temperature measurement" that publication number is CN207317964U specifically and install the degree of difficulty and nevertheless easily receive the environmental impact, the temperature measurement precision is low.
The third type is an electromagnetic wave reflection type sensor, and the working principle is as follows: the change of the external temperature causes the change of the performance of the sensor material or the change of parameters such as input impedance, gain and the like of the integrated antenna, thereby causing the change of the signal returned to the transmitting device. The research on a passive wireless patch reflection type high-temperature sensor introduces a reflection type temperature sensor suitable for a high-temperature environment, and the temperature sensor is highly integrated with a patch transmission antenna. The research starting time of the electromagnetic wave reflection type sensor is relatively late, and the practical cases of applying the electromagnetic wave reflection type sensor to the power grid equipment for temperature measurement are relatively few at present.
In the invention patent "wireless temperature measurement monitoring device for power system" and method thereof with patent number CN110726491A, a magnetic-type antenna is connected to an antenna interface on a reader-writer, emits electromagnetic wave energy outwards, receives electromagnetic wave signals fed back by a temperature measurement tag, and feeds back the electromagnetic wave signals to a control terminal through the reader-writer; and a temperature measuring system is installed in the control terminal and is used for remotely monitoring and recording the temperature data of the equipment in the running state. The magnetic-type antenna in the patent is directly connected with a reader-writer, and cannot fully utilize the signal propagation distance of electromagnetic waves; meanwhile, the number of temperature sensor sensors in the management range of the reader-writer is small, so that the data aggregation and data processing capacity of the reader-writer is limited.
Disclosure of Invention
In order to solve the problem that exists among the above-mentioned prior art, the utility model provides a wireless passive temperature measurement system passes through the radio frequency line transmission hyperfrequency electromagnetic wave between antenna and the read write line, makes read write line and a plurality of antenna connection, has prolonged the communication distance between antenna and the read write line simultaneously.
The technical scheme of the utility model as follows:
a wireless passive temperature measurement system comprises at least one reader-writer and at least one group of temperature measurement units matched with the reader-writer, wherein the group of temperature measurement units comprises a plurality of temperature sensors arranged on each temperature measurement point on site, at least one antenna arranged on site and capable of radiating all the temperature sensors of the group, and at least one radio frequency line arranged in one-to-one correspondence with the antenna;
the reader-writer is electrically connected with the corresponding antenna through the radio frequency line, and sends ultrahigh frequency electromagnetic waves to the antenna through the radio frequency line, and the antenna radiates the received ultrahigh frequency electromagnetic waves outwards;
each temperature sensor in a group of temperature measuring units receives and reflects the ultrahigh frequency electromagnetic wave transmitted by the group of antennas, and the group of antennas receive electromagnetic wave signals reflected by the temperature sensors; the reflected electromagnetic wave signal reflects the temperature value change condition of the electrical equipment;
the antenna sends the collected electromagnetic wave signals to the reader-writer through the corresponding radio frequency line, and the reader-writer performs A/D conversion on the electromagnetic wave signals to obtain temperature values corresponding to the electromagnetic wave signals and transmits the temperature values to the remote monitoring module through a communication unit;
the remote monitoring module monitors the temperature condition of the field electrical equipment in real time, and if the temperature of the temperature measuring point exceeds a threshold value, early warning information is sent to the remote monitoring module.
Furthermore, the temperature sensor is a tuning fork type temperature measurement label, a buckle type temperature measurement label or a plug type temperature measurement label.
Further, the communication unit is provided with two independent interfaces: a first interface and a second interface; the first interface transmits temperature data to local equipment through an RS485 protocol; and the second interface uploads the digital signal to a remote monitoring module.
The utility model discloses following beneficial effect has:
1. the ultrahigh frequency electromagnetic waves are transmitted between the antenna and the reader-writer through the radio frequency line, the number of the antennas connected with the reader-writer is increased, the number of the temperature sensors in the management range of the reader-writer is multiplied, and the communication distance between the antenna and the reader-writer is prolonged, so that the data gathering and data processing capacity of the reader-writer is fully utilized, and the equipment cost is reduced.
2. The utility model discloses an electromagnetic wave reflective temperature sensor has advantages such as easy installation, temperature measurement precision height, interference immunity are strong, the utility model discloses a performance is superior to other passive wireless temperature measurement systems.
3. The utility model discloses use the temperature measurement label of different grade type as temperature sensor, be applied to the looped netowrk cabinet of various patterns, cubical switchboard, cable joint.
4. The utility model discloses a set up two independent communication interface on the read write line, satisfy the demand that local demonstration and long-range upload simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of the system of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example one
Referring to fig. 1, a wireless passive temperature measurement system includes at least one reader/writer and at least one set of temperature measurement units cooperating with the reader/writer. The group of temperature measuring units comprises a plurality of temperature sensors arranged on each temperature measuring point on site, at least one antenna arranged on site and capable of radiating all the temperature sensors of the group, and at least one radio frequency line arranged in one-to-one correspondence with the antenna. Taking a 6-unit ring main unit as an example, the standard configuration includes: 18 temperature sensors, 6 antennas and 1 reader-writer.
The reader-writer is electrically connected with the corresponding antenna through the radio frequency line, and sends ultrahigh frequency electromagnetic waves to the antenna through the radio frequency line, and the antenna radiates the received ultrahigh frequency electromagnetic waves outwards;
each temperature sensor in one group of temperature measuring units receives and reflects the ultrahigh frequency electromagnetic wave transmitted by the group of antennas, and the group of antennas receive electromagnetic wave signals reflected by the temperature sensors. The reflected electromagnetic wave signal reflects the temperature value change condition of the electrical equipment. During each measurement, the reader-writer sequentially sends a plurality of ultrahigh frequency electromagnetic waves, and one ultrahigh frequency electromagnetic wave corresponds to one temperature sensor until the temperature sensors in the group complete the measurement.
The antenna sends the collected electromagnetic wave signals to the reader-writer through the corresponding radio frequency line, and the reader-writer performs A/D conversion on the electromagnetic wave signals to obtain temperature values corresponding to the electromagnetic wave signals and transmits the temperature values to the remote monitoring module through a communication unit;
the remote monitoring module monitors the temperature change condition of the measured object in real time, and if the temperature of the measured object exceeds a threshold value (the initial default is set to 80 ℃, and a user can change the temperature by himself), the reader sends early warning information to a remote monitoring system or a related responsible person (the related responsible person is informed by a short message).
The working principle of the temperature sensor in the embodiment is as follows: the change in ambient temperature induces a change in the properties of the sensor material itself, thereby inducing a change in the signal returned to the emitting device. A comparison of surface acoustic wave and electromagnetic wave reflection is shown in table 1.
TABLE 1
The beneficial effect of this embodiment lies in: the ultrahigh frequency electromagnetic waves are transmitted between the antenna and the reader-writer through the radio frequency line, the number of the antennas connected with the reader-writer is increased, the number of the temperature sensors in the management range of the reader-writer is multiplied, and the communication distance between the antenna and the reader-writer is prolonged, so that the data gathering and data processing capacity of the reader-writer is fully utilized, and the equipment cost is reduced. Electromagnetic wave reflective temperature sensor has advantages such as easy installation, temperature measurement precision height, interference immunity are strong simultaneously, the utility model discloses a performance is superior to other passive wireless temperature measurement systems.
Example two
Furthermore, the temperature sensor is a tuning fork type temperature measurement label, a buckle type temperature measurement label or a plug type temperature measurement label.
The tuning fork type temperature measurement label is suitable for connecting points such as bus bars, outgoing lines and the like in the switch cabinet. The communication distance between the tuning fork type temperature measurement tag and a reader-writer with standard configuration can reach 10 meters. The tuning fork type temperature measurement label is directly fixed through a bus bar overlapping screw, the whole flame retardant level is NUL94-VO, and the frequency deviation in the temperature range is less than 2 MHzo.
The buckle type temperature measurement label is suitable for a moving contact in a switch cabinet. The communication distance between the buckle type temperature measurement label and a reader-writer with standard configuration can reach 3 meters. The buckle type temperature measurement label can be directly clamped into any contact finger of the moving contact, the installation is simple and firm, and the self telescopic characteristic of the contact is not changed. The integral flame retardant rating is NUL94-V0, and the frequency deviation in the temperature range is less than 2 MHzo.
The performance and parameters of the end cap type temperature measurement tag are shown in table 2.
TABLE 2
| Plug temperature measurement label | Parameter(s) | Performance of |
| Material | PCB (RFC) + waterproof Package | Resistance to metal |
| Frequency of signal transmission | 902～928MHZ | Ultra high frequency transmission |
| Energy source | Electromagnetic wave energy | Passive |
| Overall dimension | φ47*φ31*3mm | Applicable to cable plug |
| Measurement accuracy | ±1℃ | Meet the requirement of the power grid temperature measuring device |
| Measuring range | -25℃～+150℃ | Meet the requirement of the power grid temperature measuring device |
| Temperature range of environment | -40℃～+180℃ | Meet the working requirements of the power grid |
| Reading distance | Greater than 0.5 m | Superior to the requirement of a power grid temperature measuring device |
| Fixing mode | Heat-conducting silicon adhesive sticker | Wide application range |
The embodiment is directed at the characteristics that the types of power equipment are wide, the quantity is large, and the temperature measurement requirements of different equipment are different in the power grid, and different types of temperature measurement tags (tuning fork type temperature measurement tags, buckle type temperature measurement tags or plug type temperature measurement tags) are used as temperature sensors and applied to various types of ring main units, switch cabinets and cable connectors.
EXAMPLE III
Further, the communication unit of the reader-writer is provided with two independent interfaces: the first interface and the second interface. The first interface transmits the temperature data of the key equipment/node to the local equipment through the RS485 interface. The second interface uploads temperature data (namely the digital signals) to a cloud server or a remote monitoring module through a Modbus RTU protocol (or a 4G network).
The improvement of the embodiment is that two independent communication interfaces are arranged on the reader-writer, and the requirements of local display and remote uploading are met simultaneously.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (3)
1. A wireless passive temperature measurement system is characterized in that: the temperature measurement unit comprises a plurality of temperature sensors arranged on each temperature measurement point on site, at least one antenna arranged on the site and capable of radiating all the temperature sensors of the group, and at least one radio frequency line arranged in one-to-one correspondence with the antenna;
the reader-writer is electrically connected with the corresponding antenna through the radio frequency line, and sends ultrahigh frequency electromagnetic waves to the antenna through the radio frequency line, and the antenna radiates the received ultrahigh frequency electromagnetic waves outwards;
each temperature sensor in a group of temperature measuring units receives and reflects the ultrahigh frequency electromagnetic wave transmitted by the group of antennas, and the group of antennas receive electromagnetic wave signals reflected by the temperature sensors; the reflected electromagnetic wave signal reflects the temperature value change condition of the electrical equipment;
the antenna sends the collected electromagnetic wave signals to the reader-writer through the corresponding radio frequency line, and the reader-writer performs A/D conversion on the electromagnetic wave signals to obtain temperature values corresponding to the electromagnetic wave signals and transmits the temperature values to the remote monitoring module through a communication unit;
the remote monitoring module monitors the temperature condition of the field electrical equipment in real time, and if the temperature of the temperature measuring point exceeds a threshold value, early warning information is sent to the remote monitoring module.
2. The wireless and passive temperature measurement system according to claim 1, wherein the temperature sensor is a tuning fork type temperature measurement tag, a snap-in type temperature measurement tag or a plug type temperature measurement tag.
3. The wireless and passive temperature measurement system of claim 1, wherein the communication unit is provided with two independent interfaces: a first interface and a second interface; the first interface transmits temperature data to local equipment through an RS485 protocol; the second interface uploads temperature data to the remote monitoring module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022572897.9U CN214040387U (en) | 2020-11-09 | 2020-11-09 | Wireless passive temperature measurement system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022572897.9U CN214040387U (en) | 2020-11-09 | 2020-11-09 | Wireless passive temperature measurement system |
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| Publication Number | Publication Date |
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| CN214040387U true CN214040387U (en) | 2021-08-24 |
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| CN202022572897.9U Active CN214040387U (en) | 2020-11-09 | 2020-11-09 | Wireless passive temperature measurement system |
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