CN216433266U - Passive wireless temperature measuring device of switch cabinet - Google Patents
Passive wireless temperature measuring device of switch cabinet Download PDFInfo
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- CN216433266U CN216433266U CN202122949593.4U CN202122949593U CN216433266U CN 216433266 U CN216433266 U CN 216433266U CN 202122949593 U CN202122949593 U CN 202122949593U CN 216433266 U CN216433266 U CN 216433266U
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Abstract
The utility model relates to a switch cabinet passive wireless temperature measuring device, which comprises a reading antenna, a data acquisition unit, a monitoring terminal and at least six surface acoustic wave temperature sensors; the surface acoustic wave temperature sensors are respectively arranged at the three-phase wire inlet end of the upper cavity of the switch cabinet, and the rest three surface acoustic wave temperature sensors are respectively arranged at the three-phase wire outlet end of the lower cavity of the switch cabinet; the reading antenna is arranged in the switch cabinet, the data collector is arranged in an instrument room of the switch cabinet, and the monitoring terminal is arranged in a monitoring room of a transformer substation; all the surface acoustic wave temperature sensors are in communication connection with the data collector through the reading antenna, and the data collector is in communication connection with the monitoring terminal. The utility model discloses really accomplish passive wireless temperature measurement, operating condition is extensive, and interference immunity is strong, and small in size can install in a flexible way at potential points that generate heat such as cable business turn over line, and the potential safety hazard is low.
Description
Technical Field
The utility model relates to a cubical switchboard temperature measurement field, in particular to passive wireless temperature measuring device of cubical switchboard.
Background
The wireless temperature measurement technology has been applied to power system switch cabinets for many years, wherein the most widely applied technology is the infrared radiation temperature measurement technology, and non-contact wireless temperature measurement is performed by using an infrared sensor. However, this thermometry technique belongs to active wireless thermometry, which has the following drawbacks:
1. the installation is inconvenient. The infrared temperature measuring probe is harsh in installation and fixing conditions and large in size, and the temperature rise state of a plurality of heating points in the cabinet cannot be effectively monitored.
2. The interference immunity is poor. The temperature measurement precision is easily influenced by factors such as cabinet cataract obstacles, dust, temperature measurement distance and the like, and the infrared temperature measurement probe needs to be regularly maintained and cleaned.
3. The potential safety hazard is high. The temperature measurement host usually needs a wired battery to supply power, so that potential hazards are brought to the safety distance of a primary system in the cabinet; meanwhile, the service life of the battery at high temperature is greatly reduced, even the potential safety hazard of failure is reached; in order to avoid the electromagnetic field from interfering the battery, a shielding box is generally required to be configured, and the installation difficulty of the temperature measuring device is increased.
SUMMERY OF THE UTILITY MODEL
The utility model provides a passive wireless temperature measuring device of cubical switchboard has solved the technical problem that the installation is inconvenient among the current active wireless temperature measurement technique, interference immunity is poor and the potential safety hazard is high.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
a switch cabinet passive wireless temperature measuring device comprises a reading antenna, a data collector, a monitoring terminal and at least six surface acoustic wave temperature sensors;
the surface acoustic wave temperature sensors are arranged at three-phase wire inlet ends of an upper cavity of the switch cabinet respectively, and the rest three surface acoustic wave temperature sensors are arranged at three-phase wire outlet ends of a lower cavity of the switch cabinet respectively; the reading antenna is arranged in the switch cabinet, the data collector is arranged in an instrument room of the switch cabinet, and the monitoring terminal is arranged in a monitoring room of a transformer substation;
all the surface acoustic wave temperature sensors are in communication connection with the data collector through the reading antenna, and the data collector is in communication connection with the monitoring terminal.
The beneficial effects of the utility model are that: taking a three-phase wire inlet end of an upper cavity and a three-phase wire outlet end of a lower cavity of the switch cabinet as six temperature measuring points, and configuring at least six surface acoustic wave temperature sensors to carry out wireless temperature measurement on the switch cabinet; polling and transmitting electromagnetic scanning signals to at least six surface acoustic wave temperature sensors through a data acquisition device in an instrument room, and measuring the temperature after the electromagnetic scanning signals are received by the at least six surface acoustic wave temperature sensors to obtain electromagnetic wave signals containing temperature characteristics; electromagnetic wave signals which contain temperature characteristics and are collected in all surface acoustic wave temperature sensors are transmitted to a data collector in an instrument room through a reading antenna in the switch cabinet to obtain temperature characteristic data, and the temperature characteristic data are transmitted to a monitoring terminal in a monitoring room to realize passive wireless temperature measurement monitoring in the switch cabinet;
the utility model provides a passive wireless temperature measuring device of cubical switchboard based on surface acoustic wave temperature sensor's temperature measurement principle, need not the configuration power, really accomplishes passive wireless temperature measurement, operating condition is extensive, and green pollution-free is difficult for receiving various factor interferences in the cabinet, and interference immunity is strong, small in size, can install in a flexible way at potential heating point such as cable business turn over line, can effectively reduce insulating obstacle, greatly reduced the potential safety hazard, simple structure, equipment operation maintenance cost is low.
On the basis of the technical scheme, the utility model discloses there is following improvement in addition:
further: in each surface acoustic wave temperature sensor, the surface acoustic wave temperature sensor comprises a shell, a temperature measuring antenna, a surface acoustic wave temperature sensing assembly and a tuning fork type mounting base; the temperature measuring antenna is arranged at the upper part of the shell, the surface acoustic wave temperature sensing assembly is arranged in the middle of the inside of the shell, and the tuning fork type mounting base is arranged at the bottom of the shell;
the at least three shells, the corresponding temperature measuring antennas and the corresponding surface acoustic wave temperature sensing assemblies are respectively arranged at three-phase wire inlet ends of an upper cavity of the switch cabinet through the corresponding tuning fork type mounting bases, and the rest at least three shells, the corresponding temperature measuring antennas and the corresponding surface acoustic wave temperature sensing assemblies are respectively arranged at three-phase wire outlet ends of a lower cavity of the switch cabinet through the corresponding tuning fork type mounting bases;
each temperature measuring antenna is in communication connection with the corresponding surface acoustic wave temperature sensing assembly, and each temperature measuring antenna is also in communication connection with the reading antenna.
Further: in each surface acoustic wave temperature sensor, the surface acoustic wave temperature sensing assembly comprises a piezoelectric substrate, an input interdigital transducer, an output interdigital transducer and a plurality of reflecting grids which are arranged in parallel, wherein the piezoelectric substrate, the input interdigital transducer, the output interdigital transducer and the reflecting grids are all arranged in the middle of the shell; the input interdigital transducers and the output interdigital transducers are arranged on corresponding piezoelectric substrates, and all the reflecting gratings are arranged on the corresponding piezoelectric substrates and are uniformly distributed on two sides of the corresponding input interdigital transducers and the corresponding output interdigital transducers;
and each input interdigital transducer and each output interdigital transducer are in communication connection with the corresponding temperature measuring antenna.
Further: the reading antenna comprises a sucker base, an antenna body and a radio frequency cable;
the sucker base is arranged at the bottom of the antenna body, and the radio frequency cable is arranged on the sucker base;
the antenna body with the radio frequency cable all pass through the sucking disc base set up in the cubical switchboard, the antenna body respectively with every surface acoustic wave temperature sensor communication connection, the radio frequency cable with data collection station communication connection.
Further: the data acquisition unit is provided with a serial communication interface and an antenna interface;
the data collector is in communication connection with the radio frequency cable through the antenna interface, and the data collector is in communication connection with the monitoring terminal through the serial communication interface.
Further: the switch cabinet passive wireless temperature measuring device further comprises a data conditioner arranged in an instrument room of the switch cabinet, and the data collector is in communication connection with the monitoring terminal through the data conditioner.
Further: the data conditioners respectively comprise a preamplification circuit, a bias voltage circuit, a voltage amplification circuit and a voltage following circuit;
the data collector is in communication connection with the pre-amplification circuit, the pre-amplification circuit is electrically connected with the voltage follower circuit sequentially through the voltage amplification circuit, the voltage amplification circuit is further electrically connected with the bias voltage circuit, and the voltage follower circuit is in communication connection with the monitoring terminal.
Further: the pre-amplification circuit comprises an operational amplifier U1A, a first resistor Ra, a second resistor Ri, a third resistor Rf, a first capacitor Ca, a second capacitor Cc, a third capacitor Ci and a fourth capacitor Cf;
an inverting input terminal of the operational amplifier U1A is electrically connected to the data collector, a non-inverting input terminal of the operational amplifier U1A is grounded, one end of the first resistor Ra, one end of the second resistor Ri, one end of the first capacitor Ca, one end of the second capacitor Cc, and one end of the third capacitor Ci are all grounded to an inverting input terminal of the operational amplifier U1A, and the other end of the first resistor Ra, the other end of the second resistor Ri, the other end of the first capacitor Ca, the other end of the second capacitor Cc, and the other end of the third capacitor Ci are all grounded; the output end of the operational amplifier U1A is connected with the power supply, the output end of the operational amplifier U1A is electrically connected with the voltage amplifying circuit, the inverting input end of the operational amplifier U1A is electrically connected with the output end of the operational amplifier U1A through the third resistor Rf, and the inverting input end of the operational amplifier U1A is electrically connected with the output end of the operational amplifier U1A through the fourth capacitor Cf.
Further: the monitoring terminal comprises a data transceiver, a controller, a display and an alarm;
the controller is respectively electrically connected with the data transceiver, the display and the alarm, and the data transceiver is in communication connection with the data conditioner.
Further: the switch cabinet passive wireless temperature measuring device further comprises a remote background, and the remote background is in communication connection with the monitoring terminal through a wireless network.
Drawings
Fig. 1 is a schematic structural diagram of a switch cabinet passive wireless temperature measuring device in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a surface acoustic wave temperature sensor in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a surface acoustic wave temperature sensing assembly according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a reading antenna in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a data conditioner according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of the circuit structures in the data conditioner according to the embodiment of the present invention.
In the drawings, the reference numbers indicate the following list of parts:
1. the acoustic surface wave temperature sensor comprises an acoustic surface wave temperature sensor 2, a reading antenna 3, a data collector 4, a monitoring terminal 5, a switch cabinet 11, a shell 12, a temperature measuring antenna 13, an acoustic surface wave temperature sensing assembly 14, a tuning fork type mounting base 21, a sucker base 22, an antenna body 23, a radio frequency cable 131, a piezoelectric substrate 132, an input interdigital transducer 133, an output interdigital transducer 134 and a reflecting grating.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
The present invention will be described with reference to the accompanying drawings.
In an embodiment, as shown in fig. 1, a switch cabinet passive wireless temperature measuring device includes a reading antenna 2, a data collector 3, a monitoring terminal 4 and at least six surface acoustic wave temperature sensors 1;
at least three surface acoustic wave temperature sensors 1 are respectively arranged at a three-phase wire inlet end of an upper cavity of the switch cabinet 5, and the rest at least three surface acoustic wave temperature sensors 1 are respectively arranged at a three-phase wire outlet end of a lower cavity of the switch cabinet 5; the reading antenna 2 is arranged in the switch cabinet 5, the data collector 3 is arranged in an instrument room of the switch cabinet, and the monitoring terminal 4 is arranged in a monitoring room of a transformer substation;
all the surface acoustic wave temperature sensors 1 are in communication connection with the data collector 3 through the reading antenna 2, and the data collector 3 is in communication connection with the monitoring terminal 4.
The working principle of the passive wireless temperature measuring device of the switch cabinet of the embodiment is as follows:
taking a three-phase wire inlet end of an upper cavity and a three-phase wire outlet end of a lower cavity of the switch cabinet as six temperature measuring points, and configuring at least six surface acoustic wave temperature sensors to carry out wireless temperature measurement on the switch cabinet; polling and transmitting electromagnetic scanning signals to at least six surface acoustic wave temperature sensors through a data acquisition device in an instrument room, and measuring the temperature after the electromagnetic scanning signals are received by the at least six surface acoustic wave temperature sensors to obtain electromagnetic wave signals containing temperature characteristics; electromagnetic wave signals which are collected by all surface acoustic wave temperature sensors and contain temperature characteristics are transmitted to a data collector in an instrument room through a reading antenna in the switch cabinet to obtain temperature characteristic data, and the temperature characteristic data are transmitted to a monitoring terminal in a monitoring room, so that passive wireless temperature measurement monitoring in the switch cabinet is realized.
The switch cabinet passive wireless temperature measuring device of this embodiment, based on surface acoustic wave temperature sensor's temperature measurement principle, need not to dispose the power, really accomplish passive wireless temperature measurement, operating condition is extensive, and green pollution-free is difficult for receiving various factor interferences in the cabinet, and interference immunity is strong, and small in size can install in a flexible way potential heating point such as cable business turn over line, can effectively reduce insulating obstacle, greatly reduced the potential safety hazard, simple structure, equipment operation maintenance cost is low.
It should be noted that the number of the surface acoustic wave temperature sensors can be selected from 6 or more than 6 according to actual situations, when the number is exactly 6, 3 of the three temperature measuring points are installed at three-phase inlet terminals of an upper chamber of the switch cabinet, namely a1, B1 and C1 in fig. 1, and the remaining 3 temperature measuring points are installed at three-phase outlet terminals of a lower chamber of the switch cabinet, namely a2, B3 and C3 in fig. 1; and when the number is more than 6, 6 of the surface acoustic wave temperature sensors are selected to be installed according to the method with the number being just 6, and the rest other surface acoustic wave temperature sensors are installed at other positions in the cabinet according to the actual situation, such as moving contacts, static contacts, busbar and other potential heating points. The number of surface acoustic wave temperature sensors in the present embodiment is specifically 6.
Preferably, as shown in fig. 2, in each of the saw temperature sensors 1, the saw temperature sensor 1 includes a housing 11, a temperature measuring antenna 12, a saw temperature sensing assembly 13, and a tuning fork type mounting base 14; the temperature measuring antenna 12 is arranged at the upper part of the shell 11, the surface acoustic wave temperature sensing assembly 13 is arranged at the middle part of the inside of the shell 11, and the tuning fork type mounting base 14 is arranged at the bottom of the shell 11;
at least three of the shells 11, the corresponding temperature measuring antennas 12 and the corresponding surface acoustic wave temperature sensing assemblies 13 are respectively arranged at three-phase wire inlet ends of an upper cavity of the switch cabinet 5 through the corresponding tuning fork type mounting bases 14, and the rest at least three of the shells 11, the corresponding temperature measuring antennas 12 and the corresponding surface acoustic wave temperature sensing assemblies 13 are respectively arranged at three-phase wire outlet ends of a lower cavity of the switch cabinet 5 through the corresponding tuning fork type mounting bases 14;
each temperature measurement antenna 12 is in communication connection with the corresponding surface acoustic wave temperature sensing assembly 13, and each temperature measurement antenna 12 is also in communication connection with the reading antenna 2.
The acoustic surface wave temperature sensing assembly is convenient for converting the received electromagnetic scanning signal into an acoustic surface wave which works inside and then converting the acoustic surface wave into an electromagnetic wave signal containing temperature characteristics; through the surface acoustic wave temperature sensor of above-mentioned structure, can be convenient for provide the receiving and dispatching passageway for electromagnetic scanning signal and electromagnetic wave signal to support the inside surface acoustic wave temperature sensing subassembly that sets up, and then be convenient for realize the temperature measurement control of each temperature measurement point in the cubical switchboard, really realize passive wireless temperature measurement.
Specifically, the casing of this embodiment is cylindrical casing, can provide signal transceiver channel better to support the inside surface acoustic wave temperature sensing subassembly that sets up, tuning fork formula installation base accessible bolt fastening also can adopt high temperature resistant high sticky double faced adhesive tape to fix.
Preferably, as shown in fig. 3, in each of the surface acoustic wave temperature sensors 1, the surface acoustic wave temperature sensing assembly 13 includes a piezoelectric substrate 131, an input interdigital transducer 132, an output interdigital transducer 133, and a plurality of reflection gratings 134 arranged in parallel, all of which are disposed in the middle of the inside of the housing 11; the input interdigital transducers 132 and the output interdigital transducers 133 are arranged on the corresponding piezoelectric substrates 131, and all the reflection gratings 134 are arranged on the corresponding piezoelectric substrates 131 and are uniformly distributed on two sides of the corresponding input interdigital transducers 132 and the corresponding output interdigital transducers 133;
each of the input interdigital transducers 132 and each of the output interdigital transducers 133 are in communication connection with the corresponding temperature measuring antenna 12.
The temperature measuring antenna is used for receiving electromagnetic scanning signals sent by the data collector, the input interdigital transducer is used for converting the received electromagnetic scanning signals into surface acoustic wave pulse signals by utilizing the inverse piezoelectric effect of the piezoelectric substrate, the surface acoustic wave pulse signals are longitudinally transmitted on the piezoelectric substrate, the surface acoustic wave pulse signals are reflected and overlapped by the reflecting gratings on two sides, finally, the output interdigital transducer is used for converting the overlapped pulse signals into electric signals by utilizing the inverse piezoelectric effect of the piezoelectric substrate and transmitting the electric signals to the temperature measuring antenna, and then the reading antenna and the data collector are used for reading temperature characteristics.
Specifically, the overall size of the surface acoustic wave temperature sensor in the embodiment is 40mm × 20mm × 45mm, the measurement accuracy is ± 2 ℃, and the temperature measurement range is-25 ℃ to 125 ℃.
Preferably, as shown in fig. 4, the reading antenna 2 includes a suction cup base 21, an antenna body 22 and a radio frequency cable 23;
the sucker base 21 is arranged at the bottom of the antenna body 22, and the radio frequency cable 23 is arranged on the sucker base 21;
The receiving of the electromagnetic wave signal transmitted by the temperature measuring antenna is realized through the antenna body, the data communication between the temperature measuring antenna and the data acquisition unit is realized through the radio frequency cable, the installation and the fixation of the whole reading antenna in the cabinet are realized through the sucker base, the temperature measuring cabinet can be suitable for different installation environments, the installation is flexible and convenient, and the application range is wide.
Specifically, reading antenna passes through the sucking disc base and installs on the inside lateral wall of cubical switchboard, and the variable dog-ear of different angles can be realized to the antenna in this embodiment.
Preferably, the data acquisition unit 3 is provided with a serial communication interface and an antenna interface;
the data collector 3 is in communication connection with the radio frequency cable 23 through the antenna interface, and the data collector 3 is in communication connection with the monitoring terminal 4 through the serial communication interface.
The data communication between the data collector and the reading antenna is realized through the antenna interface, and the data communication between the data collector and the monitoring terminal is realized through the serial communication interface.
Specifically, the number of serial communication interface and antenna interface can set up one or more according to actual conditions, and serial communication interface is RS485 half-duplex communication interface in this embodiment, and the quantity is 2, and antenna interface is 4, and 6 surface acoustic wave temperature sensor can be connected to every interface.
Preferably, the switch cabinet passive wireless temperature measuring device further comprises a data conditioner arranged in an instrument room of the switch cabinet 5, and the data collector 3 is in communication connection with the monitoring terminal 4 through the data conditioner.
The data conditioner can be used for conditioning electromagnetic wave signals carrying temperature characteristics such as amplification and the like, and further wide-range temperature characteristic data can be obtained.
Preferably, as shown in fig. 5, the data conditioners each include a pre-amplification circuit, a bias voltage circuit, a voltage amplification circuit, and a voltage follower circuit;
the data acquisition device 3 is in communication connection with the pre-amplification circuit, the pre-amplification circuit is electrically connected with the voltage follower circuit sequentially through the voltage amplification circuit, the voltage amplification circuit is further electrically connected with the bias voltage circuit, and the voltage follower circuit is in communication connection with the monitoring terminal 4.
Through the preamplification circuit, on one hand, a weak signal of an electromagnetic wave signal carrying temperature characteristics can be amplified, and on the other hand, high-impedance output of the sensor can be changed into low-impedance output; the electromagnetic wave signals can be further amplified through the voltage amplifying circuit, and direct current bias can be provided for the rear-stage operational amplifier through the bias voltage circuit; sufficient output impedance can be provided by the voltage follower circuit.
Specifically, as shown in fig. 6, the pre-amplification circuit includes an operational amplifier U1A, a first resistor Ra, a second resistor Ri, a third resistor Rf, a first capacitor Ca, a second capacitor Cc, a third capacitor Ci, and a fourth capacitor Cf;
an inverting input terminal of the operational amplifier U1A is electrically connected to the data collector, a non-inverting input terminal of the operational amplifier U1A is grounded, one end of the first resistor Ra, one end of the second resistor Ri, one end of the first capacitor Ca, one end of the second capacitor Cc, and one end of the third capacitor Ci are all grounded to an inverting input terminal of the operational amplifier U1A, and the other end of the first resistor Ra, the other end of the second resistor Ri, the other end of the first capacitor Ca, the other end of the second capacitor Cc, and the other end of the third capacitor Ci are all grounded; the output end of the operational amplifier U1A is connected with the power supply, the output end of the operational amplifier U1A is electrically connected with the voltage amplifying circuit, the inverting input end of the operational amplifier U1A is electrically connected with the output end of the operational amplifier U1A through the third resistor Rf, and the inverting input end of the operational amplifier U1A is electrically connected with the output end of the operational amplifier U1A through the fourth capacitor Cf.
Specifically, as shown in fig. 6, the voltage amplifying circuit includes an operational amplifier U2A, a fourth resistor R, a fifth resistor Rb1, a sixth resistor Rb2, and a fifth capacitor C;
the non-inverting input terminal of the operational amplifier U2A is electrically connected to the output terminal of the operational amplifier U1A through the fourth resistor R, the inverting input terminal of the operational amplifier U2A is electrically connected to the bias voltage circuit through the fifth resistor Rb1, the inverting input terminal of the operational amplifier U2A is electrically connected to the output terminal of the operational amplifier U2A through the sixth resistor Rb2, and the output terminal of the operational amplifier U2A is electrically connected to the voltage follower circuit.
Specifically, as shown in fig. 6, the bias voltage circuit includes an operational amplifier U1B, a seventh resistor Ra1, and an eighth resistor Ra 2;
the positive input end of the operational amplifier U1B is electrically connected to the VCC power supply through the seventh resistor Ra1, the positive input end of the operational amplifier U1B is also grounded through the eighth resistor Ra2, the inverting input end of the operational amplifier U1B is electrically connected to the output end of the operational amplifier U1B, and the output end of the operational amplifier U1B is electrically connected to one end of the sixth resistor Rb 2.
Specifically, as shown in fig. 6, the voltage follower circuit includes an operational amplifier U2B;
the non-inverting input terminal of the operational amplifier U2B is electrically connected to the output terminal of the operational amplifier U1A, the inverting input terminal of the operational amplifier U2B is electrically connected to the output terminal of the operational amplifier U2B, and the output terminal of the operational amplifier U2B is communicatively connected to the monitor terminal 4.
Preferably, the monitoring terminal 4 comprises a data transceiver, a controller, a display and an alarm;
the controller is respectively electrically connected with the data transceiver, the display and the alarm, and the data transceiver is in communication connection with the data conditioner.
The data transceiver is used for receiving and transmitting signals transmitted by the data conditioner, the controller is used for processing and analyzing the signals of the whole monitoring terminal, the display is used for displaying temperature characteristic data in real time, and the alarm is used for giving an alarm when the temperature reaches an alarm limit value and informing related operation and maintenance personnel in time.
Preferably, the switch cabinet passive wireless temperature measuring device further comprises a remote background, and the remote background is in communication connection with the monitoring terminal 4 through a wireless network.
Through the communication between the monitoring terminal and the remote background, the data sharing and the remote monitoring of the on-line temperature measurement of the switch cabinet can be further realized.
It should be noted that the utility model discloses only improve to the structure of cubical switchboard passive wireless temperature measuring device and relation of connection, do not relate to the improvement of computer program.
The reader should understand that in the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example" or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A switch cabinet passive wireless temperature measuring device is characterized by comprising a reading antenna (2), a data collector (3), a monitoring terminal (4) and at least six surface acoustic wave temperature sensors (1);
the acoustic surface wave temperature sensors (1) are respectively arranged at three-phase wire inlet ends of an upper chamber of the switch cabinet (5), and the rest acoustic surface wave temperature sensors (1) are respectively arranged at three-phase wire outlet ends of a lower chamber of the switch cabinet (5); the reading antenna (2) is arranged in the switch cabinet (5), the data collector (3) is arranged in an instrument room of the switch cabinet, and the monitoring terminal (4) is arranged in a monitoring room of a transformer substation;
all surface acoustic wave temperature sensors (1) all through read antenna (2) with data collection station (3) communication connection, data collection station (3) with monitor terminal (4) communication connection.
2. The switch cabinet passive wireless temperature measuring device according to claim 1, wherein in each SAW temperature sensor (1), the SAW temperature sensor (1) comprises a housing (11), a temperature measuring antenna (12), a SAW temperature sensing assembly (13) and a tuning fork type mounting base (14); the temperature measuring antenna (12) is arranged at the upper part of the shell (11), the surface acoustic wave temperature sensing assembly (13) is arranged at the middle part inside the shell (11), and the tuning fork type mounting base (14) is arranged at the bottom of the shell (11);
the at least three shells (11), the corresponding temperature measuring antennas (12) and the corresponding surface acoustic wave temperature sensing assemblies (13) are respectively arranged at three-phase wire inlet ends of an upper chamber of the switch cabinet (5) through the corresponding tuning fork type mounting bases (14), and the rest three shells (11), the corresponding temperature measuring antennas (12) and the corresponding surface acoustic wave temperature sensing assemblies (13) are respectively arranged at three-phase wire outlet ends of a lower chamber of the switch cabinet (5) through the corresponding tuning fork type mounting bases (14);
each temperature measurement antenna (12) is in communication connection with the corresponding surface acoustic wave temperature sensing assembly (13), and each temperature measurement antenna (12) is also in communication connection with the reading antenna (2).
3. The switch cabinet passive wireless temperature measuring device according to claim 2, wherein in each surface acoustic wave temperature sensor (1), the surface acoustic wave temperature sensing assembly (13) comprises a piezoelectric substrate (131), an input interdigital transducer (132), an output interdigital transducer (133) and a plurality of parallel arranged reflection gratings (134) which are all arranged in the middle of the inside of the shell (11); the input interdigital transducers (132) and the output interdigital transducers (133) are arranged on corresponding piezoelectric substrates (131), and all the reflection gratings (134) are arranged on the corresponding piezoelectric substrates (131) and are uniformly distributed on two sides of the corresponding input interdigital transducers (132) and the corresponding output interdigital transducers (133);
each input interdigital transducer (132) and each output interdigital transducer (133) are in communication connection with the corresponding temperature measuring antenna (12).
4. The switch cabinet passive wireless temperature measuring device according to claim 1, wherein the reading antenna (2) comprises a sucker base (21), an antenna body (22) and a radio frequency cable (23);
the sucker base (21) is arranged at the bottom of the antenna body (22), and the radio frequency cable (23) is arranged on the sucker base (21);
antenna body (22) with radio frequency cable (23) all pass through sucking disc base (21) set up in cubical switchboard (5), antenna body (22) respectively with every surface acoustic wave temperature sensor (1) communication connection, radio frequency cable (23) with data collection station (3) communication connection.
5. The switch cabinet passive wireless temperature measuring device according to claim 4, wherein the data collector (3) is provided with a serial communication interface and an antenna interface;
the data collector (3) is in communication connection with the radio frequency cable (23) through the antenna interface, and the data collector (3) is in communication connection with the monitoring terminal (4) through the serial communication interface.
6. The switch cabinet passive wireless temperature measuring device according to claim 1, further comprising a data conditioner arranged in an instrument room of the switch cabinet (5), wherein the data collector (3) is in communication connection with the monitoring terminal (4) through the data conditioner.
7. The switch cabinet passive wireless temperature measuring device of claim 6, wherein the data conditioners each comprise a pre-amplification circuit, a bias voltage circuit, a voltage amplification circuit and a voltage follower circuit;
the data collector (3) is in communication connection with the pre-amplification circuit, the pre-amplification circuit is electrically connected with the voltage follower circuit sequentially through the voltage amplification circuit, the voltage amplification circuit is further electrically connected with the bias voltage circuit, and the voltage follower circuit is in communication connection with the monitoring terminal (4).
8. The switch cabinet passive wireless temperature measuring device of claim 7, wherein the pre-amplification circuit comprises an operational amplifier U1A, a first resistor Ra, a second resistor Ri, a third resistor Rf, a first capacitor Ca, a second capacitor Cc, a third capacitor Ci and a fourth capacitor Cf;
an inverting input terminal of the operational amplifier U1A is electrically connected to the data collector, a non-inverting input terminal of the operational amplifier U1A is grounded, one end of the first resistor Ra, one end of the second resistor Ri, one end of the first capacitor Ca, one end of the second capacitor Cc, and one end of the third capacitor Ci are all grounded to an inverting input terminal of the operational amplifier U1A, and the other end of the first resistor Ra, the other end of the second resistor Ri, the other end of the first capacitor Ca, the other end of the second capacitor Cc, and the other end of the third capacitor Ci are all grounded; the output end of the operational amplifier U1A is connected with the power supply, the output end of the operational amplifier U1A is electrically connected with the voltage amplifying circuit, the inverting input end of the operational amplifier U1A is electrically connected with the output end of the operational amplifier U1A through the third resistor Rf, and the inverting input end of the operational amplifier U1A is electrically connected with the output end of the operational amplifier U1A through the fourth capacitor Cf.
9. The switch cabinet passive wireless temperature measuring device according to claim 6, wherein the monitoring terminal (4) comprises a data transceiver, a controller, a display and an alarm;
the controller is respectively electrically connected with the data transceiver, the display and the alarm, and the data transceiver is in communication connection with the data conditioner.
10. The switch cabinet passive wireless temperature measuring device according to any one of claims 1 to 9, further comprising a remote background, wherein the remote background is in communication connection with the monitoring terminal (4) through a wireless network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122949593.4U CN216433266U (en) | 2021-11-29 | 2021-11-29 | Passive wireless temperature measuring device of switch cabinet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122949593.4U CN216433266U (en) | 2021-11-29 | 2021-11-29 | Passive wireless temperature measuring device of switch cabinet |
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| CN216433266U true CN216433266U (en) | 2022-05-03 |
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| CN202122949593.4U Active CN216433266U (en) | 2021-11-29 | 2021-11-29 | Passive wireless temperature measuring device of switch cabinet |
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| CN (1) | CN216433266U (en) |
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2021
- 2021-11-29 CN CN202122949593.4U patent/CN216433266U/en active Active
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