CN112598099A - Passive RFID temperature and humidity patch and early warning signal device - Google Patents
Passive RFID temperature and humidity patch and early warning signal device Download PDFInfo
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- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
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- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
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Abstract
The invention belongs to the technical field of temperature and humidity monitoring or early warning of switch cabinet equipment, and particularly relates to a passive RFID temperature and humidity patch and an early warning signal device suitable for switch cabinet electrical equipment, wherein the RFID temperature and humidity patch comprises a display layer, a printed circuit layer, an anti-metal coating layer, a bonding agent layer and a tearable protective film layer which are sequentially arranged from top to bottom and used for displaying temperature; the early warning signal device comprises an RFID read-write antenna, an RFID read-write module, a data processor, a short message module, a power supply, a serial port communication module, a relay, a signal lamp and a power supply; the printed circuit layer of the RFID temperature and humidity patch can be used for collecting radio frequency energy of an RFID read-write antenna of the early warning signal device and sending temperature and humidity data signals through an RFID wireless transmission protocol. The invention overcomes the problem of difficult temperature measurement of the equipment in the switch cabinet by far infrared thermal imaging, avoids the hidden danger of equipment humidity, saves manpower and material resources and improves the intelligent operation and maintenance level of the power transmission and transformation equipment.
Description
Technical Field
The invention belongs to the technical field of temperature and humidity monitoring or early warning of switch cabinet equipment, and particularly relates to a passive RFID temperature and humidity patch and an early warning signal device suitable for switch cabinet electrical equipment.
Background
The temperature of the conductor of the electric equipment in use is increased due to overload, short circuit, poor contact, heating of the iron core, poor heat dissipation and the like, and if the electric equipment is not processed in time, dangerous temperature is generated, surrounding combustible materials or objects are heated, and fire disasters can be caused. If the ambient temperature is too high or the air fluidity is poor, the heat of the equipment cannot be dispersed in time, and the equipment can be tripped due to overheating and even burnt out.
Products in the distribution box, such as residual current operated protectors and electronic meters, can seriously affect the service life of the products when running at high temperature, and can also affect the stability of the performance of the protectors, the reliability of the actions and the accuracy of metering. Reactive compensators, fuses operating at high temperatures also have a shortened life.
Influence on the conductor material: the metal material is softened and the mechanical strength is obviously reduced when the temperature is increased. If the long-term working temperature of the copper metal material exceeds 200 ℃, the mechanical strength is obviously reduced. The mechanical strength of aluminum metal materials is also closely related to temperature, and generally, the long-term working temperature of aluminum is not more than 90 ℃, and the short-term working temperature of aluminum is not more than 120 ℃.
If the temperature is too high, the organic insulating material becomes brittle and aged, the insulating property is reduced, and even the organic insulating material breaks down. The maximum allowable temperature in the operation of the electrical equipment should not exceed the regulations of the manufacturing plant. The influence of the ambient humidity of the equipment on the electrical equipment is also serious, and for many switch equipments insulated by air gaps, the insulation performance of air is reduced due to overhigh humidity. For the insulating material, moisture in the air is attached to the surface of the insulating material, so that the insulation resistance of the electrical equipment is reduced, and particularly for the equipment with longer service life, the moisture degree is more serious and the insulation resistance is lower due to the fact that dust is accumulated in the equipment to adsorb the moisture. The leakage current of the equipment is greatly increased, even insulation breakdown is caused, and accidents are caused.
The moist air is beneficial to the growth of the mould, if the ventilation is poor, the growth speed of the mould is accelerated, and the mould contains a large amount of moisture, so that the insulating property of the equipment is greatly reduced. For some porous insulating materials, the root of the mold can also penetrate into the interior of the material, causing insulation breakdown. The acidic substances secreted in the metabolic process of the mould are interacted with the insulation, so that the insulation performance of the equipment is reduced. The moist air will cause corrosion of the conductive metal, the magnetically conductive silicon steel sheets, and the metal casing in the power equipment, which will reduce the performance and service life of the equipment, and even cause electrical failure. During the operation of the electrical equipment, the average value of the relative humidity measured within 24 hours is not more than 95%, and the average value of the relative humidity within months is not more than 90%.
The existing temperature monitoring device for the power transmission and transformation equipment is complex in structure, large in construction and maintenance workload, high in price and not easy to popularize and apply, a large amount of workers or robots are still needed to use the far infrared thermal imaging device to carry out routing inspection temperature measurement, especially, the equipment temperature measurement in a switch cabinet is difficult, a large amount of time and energy of power transformation operation and maintenance personnel are occupied, the trouble and the labor are wasted, the timeliness is poor, and the intelligent operation and maintenance mode requirement of an unmanned transformer substation is not met.
Patent document No. CN201935733U discloses an on-line temperature monitoring device for electrical equipment of a power distribution cabinet or a switch cabinet, which includes: the system comprises a plurality of infrared detection devices (1) arranged in a power distribution cabinet or a switch cabinet, wherein the infrared detection devices (1) are connected into an Intranet network through a combiner (3), and at least one rear-end monitoring computer (2) is arranged in the Intranet network; the infrared detection device (1) comprises: the infrared detector (11) is connected with the control acquisition unit (12) and aims at the electrical equipment to be monitored, and the central processing unit (13) is connected with the control acquisition unit (12), the memory (15) and the optical fiber network adapter (14). This switch board or cubical switchboard electrical equipment temperature on-line monitoring device adopts infrared detection device and rear end control computer through optical network interconnection, has realized the remote monitoring to electrical equipment, has the trouble of taking a lot of trouble and difficultly, and the scheduling problem is relatively poor in timeliness, and intelligent fortune that is not suitable for unmanned transformer substation maintains the mode and development demand thereof.
Patent document No. CN102437646B discloses a wireless temperature and humidity monitoring device for a high-voltage switch cabinet, which comprises a plurality of monitoring terminals, a plurality of monitoring master stations and a background upper computer; each switch cabinet is provided with a monitoring master station and a plurality of monitoring terminals, and data transmission is carried out between the monitoring master station and the monitoring terminals by adopting radio frequency communication modules with two frequency bands of 433M and 2.4G; and the monitoring master station and the upper computer are communicated by RS-485. The device realizes the real-time on-line monitoring of cubical switchboard electrical equipment contact temperature and environment humiture through a plurality of monitor terminal and monitoring main website etc. and there are the more scheduling problem of service equipment, fortune dimension personnel, can not adapt to unmanned transformer substation's intelligent fortune dimension mode and development demand.
Disclosure of Invention
The invention aims to provide a passive RFID temperature and humidity patch and an early warning signal device suitable for electrical equipment of a switch cabinet aiming at the problems in the prior art, the device can greatly reduce the far infrared thermal imaging temperature measurement frequency, overcome the problem of difficulty in far infrared thermal imaging temperature measurement of equipment in the switch cabinet, eliminate the hidden danger of equipment humidity, save manpower and material resources and improve the intelligent operation and maintenance level of power transmission and transformation equipment.
The technical scheme of the invention is as follows:
a passive RFID temperature and humidity patch and an early warning signal device are suitable for electrical equipment of a switch cabinet and are characterized by comprising the RFID temperature and humidity patch arranged at the temperature measuring part of the electrical equipment and the early warning signal device arranged on the switch cabinet.
RFID humiture paster include from last to down set gradually be used for showing the display layer 1 of temperature, printed circuit layer 2, anti metallic paint layer 3, paste agent layer 4, can tear the protection rete 5 that removes.
The early warning signal device comprises an RFID read-write antenna 6, an RFID read-write module 7, a data processor 8, a short message module 9, a power supply 10, a serial port communication module 11, a relay 12, a signal lamp 14 and a power supply.
The printed circuit layer 2 of the RFID temperature and humidity patch can be used for collecting radio frequency energy of an RFID read-write antenna 6 of the early warning signal device and sending temperature and humidity data signals through an RFID wireless transmission protocol.
Specifically, the display layer 1 comprises flame-retardant paper, wherein the flame-retardant paper is coated with a thermosensitive color-changing coating, and a digital scale for displaying temperature is printed on the flame-retardant paper.
Specifically, the printed circuit layer 2 includes a flexible antenna, a passive RFID chip, and a temperature and humidity detection component, where the flexible antenna is a coil wound by a metal wire or formed by a conductive circuit on a printed circuit board, and the coil is used to receive energy of a radio frequency signal transmitted by the RFID read-write module and send temperature detection data under the control of the temperature and humidity detection component; the passive RFID chip comprises an RFID control circuit; the temperature and humidity detection component comprises a temperature sensor for converting a temperature signal into an electric signal.
Specifically, the RFID control circuit includes a plurality of integrated circuits.
Specifically, the RFID control circuit includes a single-chip asic, the single-chip asic includes a radio frequency interface circuit, a digital control circuit, a temperature measurement conversion circuit, and a nonvolatile memory, and the radio frequency interface circuit is used for generating a power supply and a clock required for circuit operation, and modulating and demodulating an RFID signal; the digital control circuit is used for controlling the work flow of each part of the integrated circuit, and the coding, decoding, sending and receiving of data; the temperature measurement conversion circuit is used for converting the temperature into an electric signal through the temperature positive correlation circuit, converting the electric signal into a digital signal through the digital-to-analog conversion circuit and transmitting the digital signal to the digital control circuit; the nonvolatile memory is used for storing the characteristic data of the temperature and humidity detection part, and the characteristic data is used for correcting the temperature measurement result to improve the precision.
Specifically, the RFID read-write module 7, the data processor 8, the short message module 9, the serial communication module 11 and the relay 12 are located in an early warning signal device shell 13, the RFID read-write antenna 6 is located above the early warning signal device shell 13 and connected with the RFID read-write module 7 through a cable, and the early warning signal device shell 13 is installed on the outer side of the switch cabinet.
Most high-voltage electrical equipment of transformer substation adopts closed structure, and the radiating effect is poor, if not carrying out timely effectual monitoring measure to corresponding contact temperature, equipment just can lead to the fire incident because too high temperature rise to cause the large tracts of land to have a power failure, cause huge economic loss. In addition, the reliability and the life-span of electrical equipment can be influenced to the environment humiture in the cubical switchboard, should guarantee that the humiture keeps in the normal work allowed band of equipment for a long time. Wireless humiture monitoring system of high tension switchgear, but real-time supervision equipment contact temperature and environment humiture data to send alarm information when each monitoring data exceeds standard, remind operating personnel to take safety measure, improve the security and the equipment life of cubical switchboard operation.
At present, no related device for temperature and humidity monitoring or early warning of transformer substation equipment exists, the existing temperature monitoring device for the power transmission and transformation equipment is complex in structure, large in construction and maintenance workload, expensive and not easy to popularize and popularize, various existing RFID type temperature measurement patches and systems thereof are weak in data analysis and processing functions and are not suitable for modernized operation and maintenance work requirements of transformer operation and maintenance classes and unmanned transformer substations, the existing transformer substations still need a large amount of manual work or robots to use far infrared thermal imaging devices to carry out inspection and temperature measurement, especially equipment temperature measurement in switch cabinets is difficult, a large amount of time and energy of transformer operation and maintenance personnel are occupied, labor and time are wasted, timeliness is poor, and the intelligent operation and maintenance mode and development requirements of the unmanned transformer substations are not suitable.
The invention has the beneficial effects that: the passive RFID chip used by the humiture patch and the early warning signal device converts the temperature into an electric signal, converts the electric signal changing along with the temperature into a digital quantity, and transmits the digital temperature signal through an RFID communication protocol, so that the far infrared thermal imaging temperature measurement frequency can be greatly reduced, the problem of difficulty in far infrared thermal imaging temperature measurement of equipment in a switch cabinet is solved, the moisture hidden danger of the equipment is eliminated, manpower and material resources are saved, and the intelligent operation and maintenance level of power transmission and transformation equipment is improved The invention also provides serial communication and node signal expansion functions for a third-party online monitoring or monitoring device.
Drawings
Fig. 1 is a schematic structural view of a temperature and humidity patch;
fig. 2 is a schematic structural diagram of the warning signal device.
1 display layer, 2 printed circuit layer, 3 anti-metallic coating layer, 4 adhesive layer, 5 protective film layer,
6RFID read-write antenna, 7 RFID read-write module, 8 data processor, 9 short message module, 10 power supply, 11 serial port communication module, 12 relay, 13 early warning signal device shell, 14 signal lamp.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and the detailed description.
The invention provides a passive RFID temperature and humidity patch and an early warning signal device, which are suitable for electrical equipment of a switch cabinet.
The RFID temperature and humidity paster comprises a display layer 1, a printed circuit layer 2, an anti-metal coating layer 3, a pasting agent layer 4 and a tearable protective film layer 5 which are sequentially arranged from top to bottom, and after the protective film layer is torn off, the temperature measuring parts (on a shell or a metal conductor) of electrical equipment such as the switch cabinet inner cabinet body, the conductor connection part of a static contact, the cable head and the like can be permanently pasted on the switch cabinet inner cabinet body.
The early warning signal device comprises an RFID read-write antenna 6, an RFID read-write module 7, a data processor 8, a short message module 9, a power supply 10, a serial port communication module 11, a relay 12, a signal lamp 14 and a power supply, and is shown in figure 2.
The printed circuit layer 2 of the RFID temperature and humidity patch can be used for collecting radio frequency energy of an RFID read-write antenna 6 of the early warning signal device and sending temperature and humidity data signals through an RFID wireless transmission protocol.
The display layer 1 comprises flame-retardant paper, wherein the flame-retardant paper is coated with a thermosensitive color-changing coating and is printed with a digital scale for displaying temperature.
The printed circuit layer 2 comprises a flexible antenna, a passive RFID chip and a temperature and humidity detection component, wherein the flexible antenna is a coil wound by a metal wire or formed by a conductive circuit on a printed circuit board, and the coil is used for receiving the energy of a radio frequency signal transmitted by the RFID read-write module and transmitting temperature detection data under the control of the temperature and humidity detection component; the passive RFID chip comprises an RFID control circuit; the temperature and humidity detection component comprises a temperature sensor for converting a temperature signal into an electric signal.
The RFID control circuit comprises a plurality of integrated circuits, the RFID control circuit comprises a single-chip special integrated circuit, the single-chip special integrated circuit comprises a radio frequency interface circuit, a digital control circuit, a temperature measurement conversion circuit and a nonvolatile memory, and the radio frequency interface circuit is used for generating a power supply and a clock required by the circuit to work and modulating and demodulating an RFID signal; the digital control circuit is used for controlling the work flow of each part of the integrated circuit, and the coding, decoding, sending and receiving of data; the temperature measurement conversion circuit is used for converting the temperature into an electric signal through the temperature positive correlation circuit, converting the electric signal into a digital signal through the digital-to-analog conversion circuit and transmitting the digital signal to the digital control circuit; the nonvolatile memory is used for storing the characteristic data of the temperature and humidity detection part, and the characteristic data is used for correcting the temperature measurement result to improve the precision.
The RFID read-write module 7, the data processor 8, the short message module 9, the serial port communication module 11 and the relay 12 are positioned in an early warning signal device shell 13, the RFID read-write antenna 6 is positioned above the early warning signal device shell 13 and is connected with the RFID read-write module 7 through a cable, and the early warning signal device shell 13 is installed on the outer side of the switch cabinet. The data processor 8 is provided with temperature and humidity early warning values of 65 ℃, 70 ℃, 75 ℃ and 90% to adapt to early warning requirements of different equipment types, when a certain temperature or humidity reaches a set value, the BDS/GPS short message module 9 and the RFID read-write antenna 6 send corresponding temperature and humidity early warning short message information to a specified mobile phone, a signal lamp is bright to remind operation and maintenance personnel to carry out on-site inspection, the reason that the equipment generates heat (or has high humidity) is analyzed in advance, the root cause of equipment hidden danger is eliminated, the far infrared thermal imaging temperature measurement frequency can be greatly reduced, the humidity hidden danger of the equipment is avoided, manpower and material resources are saved, and the intelligent operation and maintenance level of the power transmission and transformation equipment is improved.
The serial port communication module 11 or the relay 12 of the early warning signal device also outputs digital signals or node signals for being provided to a third-party signal monitoring device, so that an online monitoring or monitoring function is realized.
The RFID read-write antenna 6 is arranged on the inner side of the lower cabinet behind the switch cabinet and can be in radio frequency communication with the temperature and humidity patches in the switch cabinet.
At present, a low-voltage power distribution (switch) cabinet in an electric power system is generally not provided with a temperature online monitoring device, the temperature of equipment is not monitored online, electric power operation maintenance personnel are required to perform periodic inspection, the operation condition of the equipment is observed in the inspection process, and a handheld infrared thermometer is used for measuring the temperature of the electric equipment. Although the handheld infrared imager has mature technology, convenient use and accurate temperature measurement, the handheld infrared imager has the defects of limited power distribution equipment and limited power operation maintainers, and basically only carries out one-time patrol temperature measurement in half a year, so that the condition that the electrical equipment generates heat and is not found in time is caused, and the operation fault of the electrical equipment is caused.
Several temperature measurement methods exist in the prior art are listed: 1 conventional monitoring system: the conventional temperature measuring modes such as a thermocouple, a thermal resistor, a semiconductor temperature sensor and the like need a metal wire to transmit signals, and the insulating property cannot be ensured; 2. optical fiber temperature measurement: the optical fiber temperature sensor transmits temperature signals by adopting optical fibers, the optical fibers have excellent insulating property and can isolate high voltage in the switch cabinet, so that the optical fiber temperature sensor can be directly installed on a high-voltage contact in the switch cabinet to accurately measure the operating temperature of the high-voltage contact, and the on-line monitoring of the operating temperature of the switch cabinet contact is realized. However, the optical fiber has the characteristics of easy breaking, no high temperature resistance and the like. Thereby easily lead to optic fibre creeping discharge to make insulating nature reduce after the accumulation dust, and receive the cubical switchboard structure influence, the wiring degree of difficulty is great in the cabinet. In addition, the cost of optical fiber temperature measurement is relatively high; 3. infrared temperature measurement: the infrared temperature measurement is non-contact temperature measurement, and is easily interfered by environment and surrounding electromagnetic fields, in addition, the space in the switch cabinet is very narrow, the infrared temperature measurement probe is difficult to install (because the probe must keep a certain safety distance with a measured object and needs to be over against the surface of the measured object), and the measured point can be required to be free from being covered in the visual field, and the surface is clean to ensure the accuracy; 4. active wireless temperature measurement: active wireless temperature sensors are typically relatively large in size and require frequent battery replacement, which can be costly to maintain. Meanwhile, the battery is not suitable for operating in a high temperature state, particularly, an operating environment of more than 150 ℃.
The passive RFID temperature and humidity patch and early warning signal device provided by the invention can greatly reduce the far infrared thermal imaging temperature measurement frequency, overcome the problem of difficulty in measuring the temperature of equipment in a switch cabinet by far infrared thermal imaging, avoid the hidden danger of equipment humidity, save manpower and material resources and improve the intelligent operation and maintenance level of power transmission and transformation equipment. The invention provides a temperature and humidity early warning signal without temperature and humidity data transmission, storage, display and manual analysis and judgment, and the early warning signal lamp indication and temperature and humidity patch data display provide state information for on-site manual inspection or robot inspection.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (6)
1. A passive RFID temperature and humidity patch and an early warning signal device are suitable for electrical equipment of a switch cabinet, and are characterized by comprising RFID temperature and humidity patches arranged at the temperature measuring part of the electrical equipment and the early warning signal device arranged on the switch cabinet;
the RFID temperature and humidity patch comprises a display layer (1) for displaying temperature, a printed circuit layer (2), an anti-metal coating layer (3), an adhesive layer (4) and a removable protective film layer (5) which are sequentially arranged from top to bottom;
the early warning signal device comprises an RFID read-write antenna (6), an RFID read-write module (7), a data processor (8), a short message module (9), a power supply (10), a serial communication module (11), a relay (12), a signal lamp (14) and a power supply;
the printed circuit layer (2) of the RFID temperature and humidity patch is used for collecting radio frequency energy of an RFID read-write antenna (6) of the early warning signal device and sending temperature and humidity data signals through an RFID wireless transmission protocol.
2. The passive RFID temperature and humidity patch and early warning signal device as claimed in claim 1, wherein the display layer (1) comprises flame retardant paper, and the flame retardant paper is coated with a thermochromic coating and printed with a digital scale for displaying temperature.
3. The passive RFID temperature and humidity patch and early warning signal device according to claim 1, wherein the printed circuit layer (2) comprises a flexible antenna, a passive RFID chip and a temperature and humidity detection component, the flexible antenna is a coil wound by a metal wire or formed by a conductive circuit on a printed circuit board, and the coil is used for receiving energy of a radio frequency signal transmitted by the RFID read-write module and transmitting temperature detection data under the control of the temperature and humidity detection component; the passive RFID chip comprises an RFID control circuit; the temperature and humidity detection component comprises a temperature sensor for converting a temperature signal into an electric signal.
4. The passive RFID temperature and humidity patch and warning signal device of claim 3, wherein the RFID control circuit comprises a plurality of integrated circuits.
5. The passive RFID temperature and humidity patch and warning signal device of claim 3, wherein the RFID control circuit comprises a single-chip asic, the single-chip asic comprising a radio frequency interface circuit, a digital control circuit, a temperature measurement and conversion circuit, and a non-volatile memory, the radio frequency interface circuit being configured to generate a power supply and a clock required for circuit operation, and to modulate and demodulate RFID signals; the digital control circuit is used for controlling the work flow of each part of the integrated circuit, and the coding, decoding, sending and receiving of data; the temperature measurement conversion circuit is used for converting the temperature into an electric signal through the temperature positive correlation circuit, converting the electric signal into a digital signal through the digital-to-analog conversion circuit and transmitting the digital signal to the digital control circuit; the nonvolatile memory is used for storing the characteristic data of the temperature and humidity detection part, and the characteristic data is used for correcting the temperature measurement result to improve the precision.
6. The passive RFID temperature and humidity patch and early warning signal device according to claim 1, wherein the RFID read-write module (7), the data processor (8), the short message module (9), the serial communication module (11) and the relay (12) are located in an early warning signal device shell (13), the RFID read-write antenna (6) is located above the early warning signal device shell (13) and connected with the RFID read-write module (7) through a cable, and the early warning signal device shell (13) is installed on the outer side of the switch cabinet.
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| CN202011600428.1A CN112598099A (en) | 2020-12-30 | 2020-12-30 | Passive RFID temperature and humidity patch and early warning signal device |
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| CN202011600428.1A CN112598099A (en) | 2020-12-30 | 2020-12-30 | Passive RFID temperature and humidity patch and early warning signal device |
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