CN217845422U - Temperature monitoring device suitable for strong alternating electromagnetic environment - Google Patents
Temperature monitoring device suitable for strong alternating electromagnetic environment Download PDFInfo
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- CN217845422U CN217845422U CN202222116654.3U CN202222116654U CN217845422U CN 217845422 U CN217845422 U CN 217845422U CN 202222116654 U CN202222116654 U CN 202222116654U CN 217845422 U CN217845422 U CN 217845422U
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Abstract
The utility model provides a temperature monitoring device suitable for strong alternation electromagnetic environment, temperature monitoring device includes contact temperature sensor, non-contact infrared temperature sensor, edge gateway and backstage surveillance center. Wherein, the contact temperature sensor is arranged on the IPB shell to measure the temperature of the IPB shell and transmit the temperature in a wireless mode; the non-contact infrared temperature measuring sensor is arranged in a reserved opening on the IPB shell to measure the temperature of the IPB conductor and transmit the temperature in a wireless mode; the edge gateway can receive temperature data acquired by the contact temperature sensor and the non-contact infrared temperature measurement sensor, and performs temperature display, alarm prompt and output, event recording, data recording and administrator operation; the background monitoring center is connected with the edge gateway to inquire information at regular time, and temperature data and alarm information stored by the local temperature monitoring device are obtained. The utility model discloses can realize the temperature monitoring and the data remote transmission of IPB bus conductor and shell simultaneously.
Description
Technical Field
The utility model relates to a power station IPB temperature monitoring technology field, it is specific relates to a temperature monitoring devices suitable for strong reversal electromagnetic environment.
Background
The IPB (isolated phase enclosed bus) is a full-connection type naturally-cooled isolated phase enclosed bus and is mainly used for current transmission of a main loop and a plant branch loop connected between an outgoing line of a generator set and a main transformer. The IPB is composed of a bus conductor, a shell, a post insulator, a shell supporting piece, a sealing and isolating device and the like. When the isolated phase enclosed bus runs under the normal use condition, the joint and other parts of the conductor are easy to generate heat, and the bus is burnt to cause accidents due to local overheating. Therefore, the IPB case needs to be directly measured at the connection between the main loop closed bus and the generator, the inner side of the generator outlet circuit breaker (GCB), the outer side of the generator outlet circuit breaker (GCB) and the main transformer by using a temperature measurement technology, and usually, a non-contact infrared temperature measurement probe is installed at the case corresponding to the portion of the conductor easy to generate heat, so as to indirectly measure the temperature of the conductor in a non-contact manner.
At present, temperature measuring equipment of an IPB conductor and a shell often breaks down, and particularly, the fault rate of the non-contact infrared temperature measuring equipment is the highest. The non-contact infrared temperature measuring equipment operates in a strong magnetic field environment, and the conditions of temperature measurement abnormity and equipment burnout often occur. Taking XXX hydropower station as an example, at present, the hydropower station is provided with 4 generators-transformer sets, and since 2015 production, the IPB temperature measurement system has more than 30 faults, wherein the main transformer low-voltage side temperature measurement fault accounts for 95%. According to fault data analysis, the positions of faults of a temperature measuring instrument and a temperature measuring element are mostly generated at the connection position of an IPB and the low-voltage side of a main transformer, the fault time is usually during the power transmission and circuit tripping reclosing of the main transformer, the main reason of the faults is that a power supply loop and a measuring loop in a temperature measuring system are wired measurement, strong electromagnetic induction is generated instantaneously on a lead in a strong alternating magnetic field environment, the temperature measuring instrument and the temperature measuring element are burnt, and the strong electromagnetic field environment can bring strong interference to wired data transmission. Therefore, it is desirable to provide a temperature monitoring device suitable for use in a strongly alternating electromagnetic environment.
SUMMERY OF THE UTILITY MODEL
To the not enough that exist among the prior art, the utility model aims to solve one or more problems that exist among the above-mentioned prior art. For example, the utility model aims at providing a temperature monitoring device suitable for strong alternation electromagnetic environment.
In order to achieve the above object, the utility model provides a temperature monitoring device suitable for strong alternating electromagnetic environment, which comprises a contact temperature sensor, a non-contact infrared temperature measurement sensor, an edge gateway and a background monitoring center, wherein,
the contact type temperature sensor is arranged on the IPB shell to measure the temperature of the IPB shell and transmit the temperature in a wireless mode;
the non-contact infrared temperature measuring sensor is arranged in a reserved port on the IPB shell to measure the temperature of the IPB conductor and transmit the temperature in a wireless mode;
the edge gateway can receive temperature data acquired by the contact temperature sensor and the non-contact infrared temperature measurement sensor, and performs temperature display, alarm prompt and output, event recording, data recording and administrator operation;
and the background monitoring center is connected with the edge gateway to inquire information at regular time and acquire temperature data and alarm information stored by the local temperature monitoring device.
According to an exemplary embodiment of the present invention, the contact temperature sensor and the non-contact infrared temperature measuring sensor may each include a housing, and a circuit module, an energy supply module, a temperature measuring module, and a wireless transmission module disposed in the housing, wherein,
the circuit module is insulated from the IPB, and a squirrel cage shielding structure and a high-frequency wireless communication protocol are arranged in the circuit module;
the energy supply module can supply energy to the sensor;
the temperature measurement module can acquire IPB temperature data;
wireless transmission module can carry out long-range wireless transmission to temperature data, and its inside is provided with the self-defined agreement of loRa, the self-defined agreement of loRa can strengthen wireless transmitting signal's sensitivity.
According to the utility model discloses an exemplary embodiment, contact temperature sensor and non-contact infrared temperature sensor still can include the energy-taking module, the energy-taking module can be charged for the energy supply module through light energy-taking or difference in temperature energy-taking.
According to an exemplary embodiment of the present invention, the shells of the contact temperature sensor and the non-contact infrared temperature sensor can be made of aluminum to shield the induced alternating current flowing through the sensor.
According to the utility model discloses an exemplary embodiment, can be provided with non-contact infrared temperature probe on the non-contact infrared temperature sensor.
According to an exemplary embodiment of the present invention, at least 3 contact temperature sensors and at least 1 non-contact infrared temperature measurement sensor can be disposed on each phase of the housing of the three-phase line of the IPB.
According to the utility model discloses an exemplary embodiment, contact temperature sensor accessible base sets up on IPB shell surface with welding or sticky mode, the hole structural design can be visited according to the original conductor temperature monitoring of IPB to the infrared temperature sensor of non-contact.
According to an exemplary embodiment of the present invention, the edge gateway may be provided therein with a LoRa wireless receiving module, a Flash, and a touch display screen, wherein,
the LoRa wireless receiving module can receive a wireless digital signal, a temperature digital quantity and a battery voltage digital quantity and decode equipment ID information;
the Flash can store data;
the touch display screen can display and update the monitoring data of the in-situ temperature monitoring device.
According to an exemplary embodiment of the present invention, the temperature measuring range of the contact temperature sensor may be-40 ℃ to +200 ℃, the temperature measuring accuracy may be ± 0.5 ℃, and the error is less than or equal to 2 ℃.
According to the utility model discloses an exemplary embodiment, non-contact infrared temperature sensor's temperature measurement scope can be-33 ℃ - +350 ℃, and the temperature measurement precision can be 2%, and the error is less than or equal to 2 ℃.
Compared with the prior art, the beneficial effects of the utility model include at least one of following content:
(1) The utility model can simultaneously realize the temperature monitoring of the IPB bus conductor and the shell thereof and the remote data transmission;
(2) The utility model can reduce the failure rate of the temperature measuring equipment;
(3) The utility model discloses can reduce the fortune dimension cost of temperature measurement equipment or system, improve temperature monitoring system's reliability.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a schematic structural diagram of a temperature monitoring device suitable for a strong alternating electromagnetic environment according to the present invention;
fig. 2 shows a front view of the contact temperature sensor of the present invention;
FIG. 3 illustrates a side view of a contact temperature sensor of the present invention;
FIG. 4 is a front view of the non-contact infrared temperature sensor of the present invention;
FIG. 5 shows a side view of the non-contact infrared temperature sensor of the present invention;
fig. 6 shows a schematic view of the installation of the contact temperature sensor of the present invention;
fig. 7 shows a schematic mounting diagram of the non-contact infrared temperature measurement sensor of the present invention;
FIG. 8 is a schematic diagram showing the layout of the contact temperature sensor and the non-contact infrared temperature sensor according to the present invention;
fig. 9 shows a schematic structural view of the inside of the contact temperature sensor of the present invention;
fig. 10 shows an exploded view of the contact temperature sensor of the present invention.
Reference numerals:
the system comprises a contact type temperature sensor 1, a non-contact type infrared temperature measuring sensor 2, an edge gateway 3, a background monitoring center 4, an IPB5, a main transformer 6, a fixed end 7, a sealing strip 8, a non-contact type infrared temperature measuring probe 9, a base 10, a reserved port 11, a storage battery 12, a dry battery 13, a PCB 14, a battery holder 15, an antenna 16, a shell 17, a temperature measuring probe 18, a temperature measuring probe 19, a PT1000 and a heat conducting copper sheet 20.
Detailed Description
Hereinafter, a temperature monitoring device suitable for a strongly alternating electromagnetic environment according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
It should be noted that "first," "second," and the like are merely for convenience of description and for ease of distinction, and are not to be construed as indicating or implying relative importance. "upper," "lower," "inner," "outer," "middle," and the like are used for convenience only to describe and construct relative orientations or positional relationships, and do not indicate or imply that the referenced components must have that particular orientation or position.
The utility model discloses a in the first exemplary embodiment, the temperature monitoring device who is applicable to strong reversal electromagnetic environment mainly includes contact temperature sensor, non-contact infrared temperature sensor, edge gateway and backstage surveillance center.
The contact type temperature sensor is arranged on the IPB shell and used for measuring the temperature of the IPB shell, and the non-contact type infrared temperature measurement sensor is arranged in a reserved opening on the IPB shell and used for measuring the temperature of the IPB conductor. Under the environment of a complex strong alternating electromagnetic field, the temperature measuring sensor and a background monitoring center (a data receiving terminal) can be damaged by induced current formed by strong induced electromotive force generated by coupling of a long lead with the alternating electromagnetic field, so that the temperature monitoring of the IPB shell and the conductor is realized by adopting a contact type temperature sensor and a non-contact type infrared temperature measuring sensor. The contact temperature sensor and the non-contact infrared temperature measuring sensor are both wireless and passive temperature measuring sensors and transmit temperature data signals in a wireless mode. The data transmission of the two sensors to the edge gateway is wireless one-way transmission. According to different application requirements, different temperature sensing devices can be selected. For example, the contact temperature sensor may employ a PT1000 (platinum thermistor) temperature probe.
The edge gateway can receive temperature data acquired by the contact temperature sensor and the non-contact infrared temperature sensor, can monitor the working states of the two sensors, and can perform temperature display, alarm prompt and output, event recording, data recording and administrator mode. The edge gateway can set parameters, and each sensor is set with parameters such as specific communication, temperature control point management, alarm threshold and the like so as to meet the operation requirements of different equipment in different places. The information such as the alarm times, the alarm time, the alarm category, the alarm information, the contact alarm time and the like of each device can be inquired through the output of the alarm system. The data recording, statistics and query are that the temperature monitoring data are stored through a database of the background server, the temperature data of historical time nodes can be checked in historical data query, and technicians can be helped to know the running state of the equipment through statistical analysis of the historical data. The administrator mode is to operate the corresponding functional module by classifying and managing the authority of the personnel and endowing different types of personnel with different authorities. If equipment management is needed, the system can enter an administrator mode, corresponding temperature control point configuration operation is executed, and temperature control point parameters can be modified and checked. As an embodiment of the utility model, edge gateway can imbed in block terminal or switch board, installs through the screw hole, consider 12V dc supply, communication link and data receiving antenna's wiring can, specifically look the on-the-spot condition decision. The data transmitted between the edge gateway and the sensor in a wireless mode is safe and reliable, radio frequency physical signals are modulated and demodulated, the wireless frequency points are not public at specific frequency points within an open frequency band (470 MHz-510 MHz), a modulation and demodulation mode is not public, and a frame structure and a preamble identification code are all configured in a private mode. The data transmission of the wireless signal link layer adopts a private encryption protocol. The gateway uplink adopts communication protocols such as HTTPS, MQTT and the like, and the security of the transmission process is ensured through transmission encryption and identity authentication.
The background monitoring center is in wired connection with the edge gateway, the edge gateway can transmit the sensor temperature data stored in the spot to the background monitoring center, and the background monitoring center can inquire information to the edge gateway at regular time to acquire the temperature data and alarm information stored in the spot temperature monitoring device. The data transmission between the background monitoring center and the edge gateway is bidirectional data transmission. The edge gateway can provide various uplink communication physical interfaces, such as RJ45, RS485, WIFI or 4G and the like, and the communication protocol supports MODBUS-RTU, MODBUS-TCP or MQTT and the like. The background monitoring center can initiate query to the edge gateway at regular time through interfaces such as RS485 and RJ45, and the like, and acquire sensor temperature data, alarm information and the like stored in the edge gateway in situ. For example, the data output of the edge gateway adopts an RJ45/RS485 interface, is adaptive to the existing background monitoring center, and supports local firmware upgrading.
In the present exemplary embodiment, each of the contact temperature sensor and the non-contact infrared temperature sensor may include a housing, and a circuit module, an energy supply module, a temperature measurement module, and a wireless transmission module disposed in the housing.
Since the electromagnetic environment on the generator or main transformer side is complex, physical insulation between the measured object and the internal circuit needs to be fully considered in terms of the internal circuit, the antenna and the structure of the sensor device, and wireless signal sensitivity needs to be considered in terms of the antenna transmission signal. Therefore, the circuit modules of the contact temperature sensor and the non-contact infrared temperature sensor are insulated from the IPB, a squirrel cage shielding structure (electromagnetic shielding structure) is arranged in the circuit modules, the influence of a complex strong alternating electromagnetic field on the temperature sensor can be greatly reduced, a high-frequency wireless communication protocol is further arranged, and the sensitivity of a wireless transmitting signal can be enhanced.
The energy supply module can supply energy to the sensor, for example, the energy supply module can adopt the mode of battery energy storage to realize the self-power supply of sensor, accomplishes data acquisition and wireless data transmission.
The temperature measurement module is capable of collecting IPB temperature data. Specifically, the temperature sensing element of the temperature measurement module adopts an RTD (resistance temperature detector), surface-mount contact measurement is carried out, and the sampling temperature digital quantity is calculated by a temperature analog signal through signal mapping, ADC digital sampling, line type fitting, a multiple mean value filtering algorithm and a temperature compensation algorithm. The functions of the temperature measurement module further include: encrypting and coding the equipment ID, the temperature digital quantity and the battery voltage digital quantity into a byte stream message; and sending LoRa wireless digital signals through a chip-integrated radio frequency module and a spring antenna arranged in the equipment.
The wireless transmission module can carry out remote wireless transmission to the temperature data. The common wireless transmission is that the wireless transmission of data stream is realized by adopting a long-distance wireless local area network wireless communication standard LoRa (low power consumption wireless wide area network), the wireless frequency is set in a 470-510MHz application-free frequency band, the air interface communication baud rate is 10Kbps, and the wireless signal modulation and demodulation is added with an FEC forward error correction algorithm and a CRC32 message check algorithm. The method adopts a conventional message coding mode, private encryption protocol coding and decoding and CRC16 message inspection. The contact type temperature sensor and the non-contact type infrared temperature measurement sensor adopt a self-defined communication protocol based on LoRa modulation to transmit temperature monitoring data. The inside self-defined agreement of loRa that is provided with of wireless transmission module can further strengthen loRa's transmission stability and data receiving and dispatching average power consumption. The user-defined wireless LoRa can transmit the real-time temperature information of the IPB conductor and the shell to be detected, which are acquired by the temperature monitoring device, to the edge gateway and the background monitoring center. The self-defined agreement of loRa can reduce signal collision probability when reinforcing wireless transmission signal sensitivity to greatly reduce the consumption demand that wireless transmission brought, improve the whole operating performance of equipment.
In the exemplary embodiment, the contact temperature sensor and the non-contact infrared temperature measurement sensor may further include an energy obtaining module, and the energy obtaining module may charge the energy supply module by light energy obtaining or temperature difference energy obtaining instead of conventional active charging. For example, the surface of the sensor is embedded with a solar photovoltaic panel, and the energy supply module can be charged by light energy extraction. Contact temperature sensor and non-contact infrared temperature sensor can utilize light to get the ability, the difference in temperature is got the ability and the battery energy storage is whole sensor energy supply, makes the sensor realize autonomous operation under the illumination intensity more than 1000LUX or the difference in temperature condition more than 10 ℃, stops faults such as sensor components and parts burnout that power return circuit leads to.
In the exemplary embodiment, the housings of the contact temperature sensor and the non-contact infrared temperature sensor can be made of aluminum, and can shield the induced alternating current flowing through the sensors. In addition, the shells of the two sensors need to comprehensively consider application scenes, the antenna is built in, the sensor is built in, the joint part of the upper cover and the lower cover of the shell needs to be sealed by using a sealing strip (such as a rubber waterproof sealing strip), and the interior and the exterior of the shell need to be subjected to dustproof and waterproof treatment.
In the present exemplary embodiment, a non-contact infrared temperature measuring probe may be disposed on the non-contact infrared temperature measuring sensor. The non-contact infrared temperature measuring probe can adopt a low-power consumption thermal infrared probe, and the probe can realize non-contact temperature monitoring on the IPB conductor.
In the present exemplary embodiment, at least 3 contact temperature sensors and at least 1 non-contact infrared thermometry sensor may be provided on each phase housing of the three-phase line of the IPB. For example, install 3 contact temperature sensor on each looks shell of IPB three-phase line, 3 contact temperature sensor each other are reserve, can carry out diversified monitoring, improve the monitoring accuracy. 1 non-contact infrared temperature measuring sensor is arranged on each phase shell of an IPB three-phase line, and an original reserved port (probe hole) for monitoring the temperature of an IPB conductor is used as a monitoring hole. And 9 contact temperature sensors and 3 non-contact infrared temperature measurement sensors are mounted on the IPB shell of each main transformer. In order to facilitate the receiving and transmission of monitoring data, 1 edge gateway is installed, and the edge gateway can transmit data such as temperature stored by a sensor on an IPB shell of each main transformer in the field to a background monitoring center.
The contact temperature sensor and the non-contact infrared temperature sensor may be much smaller than the IPB lines, for example, when the IPB housing outer diameter is 1450mm, the contact temperature sensor may be 56mmx 58.5mm, and the non-contact infrared temperature sensor may be 72mmx 63.5mm.
The arrangement positions of the contact temperature sensor and the non-contact infrared temperature measurement sensor on the IPB shell are not specially limited, namely the contact temperature sensor and the non-contact infrared temperature measurement sensor can be arranged at any available position on the IPB shell. Preferably, the contact temperature sensor and the non-contact infrared temperature sensor can be arranged on the housing of the IPB near one side of the main transformer.
In this exemplary embodiment, the material of IPB shell is aluminium usually, and not magnetism can not be inhaled, can not punch and inconvenient welding operation, consequently, accessible welding or sticky mode installation base on IPB shell surface, install contact temperature sensor on the base again, can avoid producing the damage to IPB shell surface like this, conveniently change and adjust contact temperature sensor. The installation process is as follows:
first step, paint removal of IPB housing
And removing the antirust paint of the housing at the mounting position of the IPB housing by using a powerful paint remover so that the adhesion between the glue and the base is firmer.
Secondly, gluing, fixing and installing the base
And (4) coating glue on the base and fixing the base at the paint removing position of the IPB shell.
Thirdly, installing a contact temperature sensor
And after the glue is completely solidified, screwing the contact type temperature sensor into the base through the threaded hole to finish the installation.
The non-contact infrared temperature measurement sensor can be designed according to the original conductor temperature monitoring probing hole structure of the IPB, the mounting structure of the original monitoring device is utilized to the maximum extent, and mounting construction engineering of the non-contact infrared temperature measurement sensor is reduced. The installation construction of non-contact infrared temperature sensor is easy and simple to handle, only need take off the original infrared temperature sensor of IPB after, with the infrared temperature sensor of non-contact through on the IPB shell original reserve intraoral screw hole screw can.
In the exemplary embodiment, an LoRa wireless receiving module, a Flash and a touch display screen may be disposed in the edge gateway.
The edge gateway fully considers the environmental influence of a strong alternating electromagnetic field in the structural design, performs electromagnetic shielding protection design on a main electronic circuit structural unit (LoRa wireless receiving module), has an industrial four-level standard, and can stably operate for a long time at the temperature of-40 ℃ to +85 ℃. The LoRa wireless receiving module is provided with various communication modes such as Bluetooth, WIFI, a 4G, UART serial port, an RJ45 network port or LoRa protocol communication, and can receive information such as a wireless digital signal, temperature digital quantity and battery voltage digital quantity and decode equipment ID information. For example, the LoRa wireless receiving module may implement wireless communication with the sensor using the low power LoRa protocol. If the edge gateway is close to the wireless communication distance of the sensor, on the premise of ensuring the wireless communication quality, the antenna system for receiving the monitoring data of the sensor can be subjected to reduction processing, so that the energy coupling of an electromagnetic field to the gateway antenna is reduced, and the use safety of the edge gateway is ensured. The performance parameters of the edge gateway are as follows:
table 1 edge gateway performance parameters
The Flash arranged in the edge gateway supports data storage, can store data in the edge gateway within one month, and can locally check a temperature data historical curve.
The touch display screen can display the monitoring data of the local sensor, and inspection workers can conveniently inquire real-time data and historical data. The touch screen display can also update data parameter variables for the uplink query. Here, the touch display screen may be a liquid crystal panel. The data acquired by the edge gateway can be displayed on a local liquid crystal panel, and can also be transmitted and uploaded to a background monitoring center for storage and viewing through a communication link.
In the exemplary embodiment, the temperature measurement range of the contact temperature sensor may be-40 ℃ to +200 ℃, the temperature measurement accuracy may be ± 0.5 ℃, and the error may be ≤ 2 ℃. The specific performance parameters of the contact temperature sensor are as follows:
TABLE 2 contact temperature sensor Performance parameters
In the exemplary embodiment, the temperature measuring range of the non-contact infrared temperature measuring sensor can be-33 ℃ to +350 ℃, the temperature measuring precision can be +/-2%, and the error can be less than or equal to 2 ℃. The specific performance parameters of the non-contact infrared temperature measurement sensor are as follows:
TABLE 3 non-contact Infrared thermometric sensor Performance parameters
Fig. 1 shows a schematic structural diagram of a temperature monitoring device suitable for a strong alternating electromagnetic environment according to the present invention; FIG. 2 illustrates a front view of the contact temperature sensor of the present invention; FIG. 3 illustrates a side view of a contact temperature sensor of the present invention; FIG. 4 is a front view of the non-contact infrared temperature sensor of the present invention; FIG. 5 shows a side view of the non-contact infrared temperature sensor of the present invention; fig. 6 shows a schematic view of the installation of the contact temperature sensor of the present invention; fig. 7 shows a schematic mounting diagram of the non-contact infrared temperature measurement sensor of the present invention; fig. 8 shows a schematic layout of the contact temperature sensor and the non-contact infrared temperature sensor of the present invention; fig. 9 shows a schematic structural view of the inside of the contact temperature sensor of the present invention; fig. 10 shows an exploded view of the contact temperature sensor of the present invention.
In the second exemplary embodiment of the present invention, as shown in fig. 1, the temperature monitoring device suitable for strong alternating electromagnetic environment mainly includes a contact temperature sensor 1, a non-contact infrared temperature measurement sensor 2, an edge gateway 3, and a background monitoring center 4.
The contact type temperature sensor 1 is arranged on the shell of the IPB5 and used for measuring the temperature of the shell of the IPB, and the non-contact type infrared temperature measuring sensor 2 is arranged in a reserved opening on the shell of the IPB5 and used for measuring the temperature of an IPB conductor. The contact temperature sensor and the non-contact infrared temperature measuring sensor are both wireless and passive temperature measuring sensors and transmit temperature data signals in a wireless mode. The data transmission of the two sensors to the edge gateway is wireless one-way transmission. According to different application requirements, different temperature sensing devices can be selected. For example, as shown in FIG. 10, the contact temperature sensor may employ a PT1000 temperature probe 19.
The edge gateway 3 can receive temperature data collected by the contact temperature sensor 1 and the non-contact infrared temperature measurement sensor 2, can monitor the working states of the two sensors, and can perform temperature display, alarm prompt and output, event recording, data recording and administrator modes. The edge gateway can set parameters, and each sensor is set with parameters such as specific communication, temperature control point management, alarm threshold and the like so as to meet the operation requirements of different equipment in different places. As an embodiment of the utility model, the border gateway can be embedded in block terminal or switch board, and the site conditions is decided according to the specific installation. The data transmitted between the edge gateway and the sensor is safe and reliable, the radio frequency physical signal is modulated and demodulated, the wireless frequency point is not disclosed in the specific frequency point in the open frequency band (470 MHz-510 MHz), the modulation and demodulation mode is not disclosed, and the frame structure and the preamble identification code are all configured privately. The data transmission of the wireless signal link layer adopts a private encryption protocol. The gateway uplink adopts communication protocols such as HTTPS, MQTT and the like, and the security of the transmission process is ensured through transmission encryption and identity authentication.
The background monitoring center 4 is connected with the edge gateway 3 by wire. The edge gateway can transmit the sensor temperature data stored in the spot to the background monitoring center, and the background monitoring center can query the edge gateway for information at regular time and acquire the temperature data and alarm information stored by the spot temperature monitoring device. The data transmission between the background monitoring center and the edge gateway is bidirectional data transmission. The edge gateway can provide various uplink communication physical interfaces, such as RJ45, RS485, WIFI or 4G and the like, and the communication protocol supports MODBUS-RTU, MODBUS-TCP or MQTT and the like. The background monitoring center can initiate query to the edge gateway at regular time through interfaces such as RS485 and RJ45, and the like, and acquire sensor temperature data, alarm information and the like stored in the edge gateway in situ. For example, the data output of the edge gateway adopts an RJ45/RS485 interface, is adaptive to the existing background monitoring center, and supports local firmware upgrading.
In the exemplary embodiment, each of the contact temperature sensor and the non-contact infrared temperature sensor may include a housing, and a circuit module, an energy supply module, a temperature measurement module, and a wireless transmission module disposed in the housing.
Since the electromagnetic environment on the generator or main transformer side is complex, physical insulation between the measured object and the internal circuit needs to be fully considered in terms of the internal circuit, the antenna and the structure of the sensor device, and wireless signal sensitivity needs to be considered in terms of the antenna transmission signal. Therefore, the circuit modules of the contact type temperature sensor and the non-contact type infrared temperature measuring sensor are insulated from the IPB, a squirrel cage shielding structure (electromagnetic shielding structure) is arranged in the circuit modules, the influence of a complex strong alternating electromagnetic field on the temperature measuring sensor can be greatly reduced, a high-frequency wireless communication protocol is further arranged, and the sensitivity of wireless transmitting signals can be enhanced. The circuit module may be disposed on the PCB circuit board 14 in fig. 10.
The energy supply module can supply energy to the sensor, for example, the energy supply module can adopt the mode of battery energy storage to realize the self-power supply of sensor, accomplishes data acquisition and wireless data transmission. As shown in fig. 9, the battery storage energy may utilize the dry cells 13 in the battery holder 15 and the secondary battery 12 provided on the housing 17.
The temperature measurement module is capable of collecting IPB temperature data. Specifically, the temperature sensing element of the temperature measurement module adopts an RTD (resistance temperature detector), surface-mounted contact measurement is carried out, and the sampling temperature digital quantity is calculated by a temperature analog signal through signal mapping, ADC digital sampling, line fitting, a multiple mean value filtering algorithm and a temperature compensation algorithm. The functions of the temperature measurement module further include: encrypting and coding the equipment ID, the temperature digital quantity and the battery voltage digital quantity into a byte stream message; and sending LoRa wireless digital signals through a chip-integrated radio frequency module and a spring antenna built in the equipment. The temperature measurement module may be disposed on the PCB circuit board 14 in fig. 10.
The wireless transmission module can carry out remote wireless transmission to the temperature data. The common wireless transmission is that the wireless transmission of data stream is realized by adopting a long-distance wireless local area network wireless communication standard LoRa (low power consumption wireless wide area network), the wireless frequency is set in a 470-510MHz application-free frequency band, the air interface communication baud rate is 10Kbps, and the wireless signal modulation and demodulation is added with an FEC forward error correction algorithm and a CRC32 message check algorithm. The method adopts a conventional message coding mode, private encryption protocol coding and decoding and CRC16 message inspection. The contact type temperature sensor and the non-contact type infrared temperature measurement sensor adopt a self-defined communication protocol based on LoRa modulation to transmit temperature monitoring data. The inside self-defined agreement of loRa that is provided with of wireless transmission module can further strengthen loRa's transmission stability and data receiving and dispatching average power consumption. The user-defined wireless LoRa can transmit the real-time temperature information of the IPB conductor and the shell to be detected, which are acquired by the temperature monitoring device, to the edge gateway and the background monitoring center. The self-defined agreement of loRa can reduce signal collision probability when reinforcing wireless transmission signal sensitivity to greatly reduce the consumption demand that wireless transmission brought, improve the whole operating performance of equipment. The wireless transmission module may be disposed on the PCB circuit board 14 in fig. 10, and may further include an antenna 16 on the PCB circuit board 14 in fig. 10.
In the exemplary embodiment, the contact temperature sensor and the non-contact infrared temperature measurement sensor may further include an energy obtaining module, and the energy obtaining module may charge the energy supply module by light energy obtaining or temperature difference energy obtaining instead of conventional active charging. For example, the surface of the sensor is embedded with a solar photovoltaic panel, and the energy supply module can be charged by light energy extraction. The contact type temperature sensor and the non-contact type infrared temperature measurement sensor can utilize light energy taking, temperature difference energy taking and battery energy storage to supply energy to the whole sensor, so that the sensor can realize autonomous operation under the condition of illumination intensity above 1000LUX or temperature difference above 10 ℃, and faults such as sensor element burning caused by a power supply loop are avoided.
In the exemplary embodiment, the housings of the contact temperature sensor and the non-contact infrared temperature sensor can be made of aluminum, and can shield the induced alternating current flowing through the sensors. In addition, the shells of the two sensors need to comprehensively consider application scenes, the antenna is built in, the sensor is built in, as shown in fig. 3 or fig. 5, the joint part of the upper cover and the lower cover of the shell of the contact type temperature sensor 1 or the non-contact type infrared temperature measurement sensor 2 is sealed by using a sealing strip 8, and the interior and the exterior of the shell are subjected to dustproof and waterproof treatment.
In the present exemplary embodiment, as shown in fig. 5, a noncontact infrared temperature measuring probe 9 may be provided on the noncontact infrared temperature measuring sensor 2. The non-contact infrared temperature measuring probe can adopt a low-power consumption thermal infrared probe, and the probe can realize non-contact temperature monitoring on the IPB conductor.
In the present exemplary embodiment, at least 3 contact temperature sensors and at least 1 non-contact infrared temperature measurement sensor may be disposed on each phase housing of the three-phase lines of the IPB. The arrangement positions of the contact temperature sensor and the non-contact infrared temperature measurement sensor on each phase shell of the IPB are not specially limited. Preferably, as shown in fig. 1, the contact temperature sensor 1 and the non-contact infrared temperature measuring sensor 2 may be disposed on the housing of the IPB5 near one side of the main transformer 6. For example, as shown in fig. 8, 3 contact temperature sensors 1 and 1 non-contact infrared thermometric sensor 2,4 are mounted on each phase of the housing of the three-phase line of the IPB5 and are circumferentially and uniformly distributed on the IPB housing. 3 contact temperature sensor each other are reserve, can carry out diversified monitoring, improve the monitoring accuracy. And 9 contact temperature sensors and 3 non-contact infrared temperature measurement sensors are mounted on the IPB shell of each main transformer.
The contact temperature sensor and the non-contact infrared temperature sensor are much smaller than the IPB pipeline, for example, when the outer diameter of the IPB housing is 1450mm, the contact temperature sensor may be 56mm by 58.5mm, and the non-contact infrared temperature sensor may be 72mm by 63.5mm.
In the exemplary embodiment, the IPB housing is usually made of aluminum, which is not magnetically attractable, not perforated, and is inconvenient for welding operation, so that the base can be mounted on the surface of the IPB housing by welding or gluing, and then the contact temperature sensor is mounted on the base. As shown in fig. 2 or fig. 3, the contact temperature sensor 1 is provided with a fixing end 7, and the surface of the fixing end can be provided with threads which can be matched with the threads in the base. As shown in fig. 10, the fixed end 7 has a temperature probe opening 18 therein, in which a temperature probe can be disposed. As shown in FIG. 9, a copper sheet 20 may also be disposed in the opening 18 of the thermometric probe. As shown in fig. 6, the base 10 is fixed on the IPB5 housing, and the contact temperature sensor 1 is screwed into the internal threaded hole of the base through the fixing end 7 to be connected with the IPB housing.
The non-contact infrared temperature measurement sensor can be designed according to the original conductor temperature monitoring probing hole structure of the IPB, the mounting structure of the original monitoring device is utilized to the maximum extent, and mounting construction engineering of the non-contact infrared temperature measurement sensor is reduced. As shown in fig. 4 or fig. 5, the non-contact infrared temperature sensor 2 is provided with a fixed end 7, and the surface of the fixed end is provided with threads which can be matched with the threads in the original reserved opening (threaded hole) on the IPB housing. As shown in fig. 5, the non-contact infrared temperature measuring probe 9 of the non-contact infrared temperature measuring sensor 2 is connected to the fixed end 7, which facilitates the installation and replacement of the probe. As shown in fig. 7, the non-contact infrared temperature measuring sensor 2 is screwed in the reserved port 11 through the fixing end 7 to be connected with the IPB.
In the exemplary embodiment, an LoRa wireless receiving module, a Flash and a touch display screen may be disposed in the edge gateway.
The edge gateway fully considers the environmental influence of a strong alternating electromagnetic field in the structural design, performs electromagnetic shielding protection design on a main electronic circuit structural unit (LoRa wireless receiving module), has an industrial four-level standard, and can stably operate for a long time at the temperature of-40 ℃ to +85 ℃. LoRa wireless receiving module disposes multiple communication modes such as bluetooth, WIFI, 4G, UART serial ports, RJ45 net gape or LoRa protocol communication, can receive information such as radio digital signal, temperature digital quantity and battery voltage digital quantity and decoding equipment ID information. For example, the LoRa wireless receiving module may implement wireless communication with the sensor using the low power LoRa protocol. If the wireless communication distance between the edge gateway and the sensor is short, the antenna system for receiving the monitoring data of the sensor can be subjected to reduction processing on the premise of ensuring the wireless communication quality, so that the energy coupling of an electromagnetic field to the gateway antenna is reduced, and the use safety of the edge gateway is ensured. The Flash arranged in the edge gateway supports data storage, can store data in the edge gateway within one month, and can locally check the historical temperature data curve. The touch display screen can display the monitoring data of the local sensor, and inspection workers can conveniently inquire real-time data and historical data. The touch screen display can also update data parameter variables for the uplink query. Here, the touch display screen may be a liquid crystal panel. The data acquired by the edge gateway can be displayed on a local liquid crystal panel, and can also be transmitted and uploaded to a background monitoring center for storage and viewing through a communication link.
In the exemplary embodiment, the temperature measurement range of the contact temperature sensor may be-40 ℃ to +200 ℃, the temperature measurement accuracy may be ± 0.5 ℃, and the error may be ≤ 2 ℃.
In the exemplary embodiment, the temperature measuring range of the non-contact infrared temperature measuring sensor can be-33 ℃ to +350 ℃, the temperature measuring precision can be +/-2%, and the error can be less than or equal to 2 ℃.
To sum up, the present invention provides advantages including at least one of the following:
(1) The utility model fully considers the environmental influence of strong alternating electromagnetic field, and makes electromagnetic shielding protection design in the sensor and the edge gateway, thereby ensuring the long-term stable operation of the temperature monitoring equipment;
(2) The contact type temperature sensor and the non-contact type infrared temperature measuring sensor provided by the utility model can utilize light energy taking, temperature difference energy taking and battery energy storage and supply, and can reduce the occurrence probability of faults such as sensor burning caused by a power supply loop;
(3) The utility model provides a contact temperature sensor and non-contact infrared temperature sensor carry out data transmission mode with edge gateway is wireless form, can avoid the strong electric magnetic field environment to the strong interference that data transmission brought.
Although a temperature monitoring device suitable for strongly alternating electromagnetic environments of the present invention has been described above by way of example embodiments. It will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the invention without departing from the spirit and scope of the invention as defined in the claims.
Claims (10)
1. A temperature monitoring device suitable for a strong alternating electromagnetic environment is characterized by comprising a contact type temperature sensor, a non-contact type infrared temperature measurement sensor, an edge gateway and a background monitoring center, wherein,
the contact type temperature sensor is arranged on the IPB shell to measure the temperature of the IPB shell and transmit the temperature in a wireless mode;
the non-contact infrared temperature measuring sensor is arranged in a reserved port on the IPB shell to measure the temperature of the IPB conductor and transmit the temperature in a wireless mode;
the edge gateway can receive temperature data acquired by the contact temperature sensor and the non-contact infrared temperature sensor, and performs temperature display, alarm prompt and output, event recording, data recording and administrator operation;
and the background monitoring center is connected with the edge gateway to inquire information at regular time and acquire temperature data and alarm information stored by the in-situ temperature monitoring device.
2. The temperature monitoring device suitable for strong alternating electromagnetic environment of claim 1, wherein the contact temperature sensor and the non-contact infrared temperature sensor each comprise a housing, and a circuit module, an energy supply module, a temperature measurement module and a wireless transmission module arranged in the housing, wherein,
the circuit module is insulated from the IPB, and a squirrel cage shielding structure and a high-frequency wireless communication protocol are arranged in the circuit module;
the energy supply module can supply energy to the sensor;
the temperature measurement module can acquire IPB temperature data;
the wireless transmission module can carry out long-range wireless transmission to temperature data, and its inside is provided with the self-defined agreement of loRa, the self-defined agreement of loRa can strengthen wireless transmitting signal's sensitivity.
3. The temperature monitoring device suitable for strong alternating electromagnetic environment of claim 1, wherein the contact temperature sensor and the non-contact infrared temperature sensor further comprise an energy obtaining module, and the energy obtaining module can charge the energy supply module by light energy obtaining or temperature difference energy obtaining.
4. The temperature monitoring device suitable for use in a strongly alternating electromagnetic environment as claimed in claim 1, wherein the housings of the contact temperature sensor and the non-contact infrared temperature sensor are made of aluminum material to shield the induced alternating current flowing through the sensors.
5. The temperature monitoring device suitable for strong alternating electromagnetic environment according to claim 1, wherein the non-contact infrared temperature measuring probe is arranged on the non-contact infrared temperature measuring sensor.
6. The temperature monitoring device suitable for strong alternating electromagnetic environment of claim 2, wherein at least 3 contact temperature sensors and at least 1 non-contact infrared temperature measuring sensor are arranged on each phase shell of the three-phase line of the IPB.
7. The temperature monitoring device suitable for the strongly alternating electromagnetic environment according to claim 2, wherein the contact temperature sensor is welded or glued on the surface of the IPB shell through a base, and the non-contact infrared temperature measurement sensor is designed according to the original conductor temperature monitoring probe hole structure of the IPB.
8. The temperature monitoring device suitable for strong alternating electromagnetic environment according to claim 1, wherein an LoRa wireless receiving module, a Flash and a touch display screen are arranged in the edge gateway, wherein,
the LoRa wireless receiving module can receive a wireless digital signal, a temperature digital quantity and a battery voltage digital quantity and decode equipment ID information;
the Flash can store data;
the touch display screen can display and update the monitoring data of the in-situ temperature monitoring device.
9. The temperature monitoring device suitable for the strongly alternating electromagnetic environment according to claim 1, wherein the temperature measurement range of the contact temperature sensor is-40 ℃ to +200 ℃, the temperature measurement precision is ± 0.5 ℃, and the error is less than or equal to 2 ℃.
10. The temperature monitoring device suitable for the strongly alternating electromagnetic environment according to claim 1, wherein the temperature measuring range of the non-contact infrared temperature measuring sensor is-33 ℃ to +350 ℃, the temperature measuring precision is +/-2%, and the error is less than or equal to 2 ℃.
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| CN117309151A (en) * | 2023-10-09 | 2023-12-29 | 镇江加勒智慧电力科技股份有限公司 | Overheat fault early warning system and method for dense insulating bus duct |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117309151A (en) * | 2023-10-09 | 2023-12-29 | 镇江加勒智慧电力科技股份有限公司 | Overheat fault early warning system and method for dense insulating bus duct |
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