CN112784945A

CN112784945A - High-availability mutual inductor electronic tag system

Info

Publication number: CN112784945A
Application number: CN202110031802.9A
Authority: CN
Inventors: 费晓明; 严娴峥; 董哲峰; 赵司恒; 姚费锋; 柏菊红; 李国平; 朱慧杰; 李越玮; 开馨
Original assignee: Huzhou Zhongke Fanzai Electric Power Technology Development Co ltd; Huzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Current assignee: Huzhou Zhongke Fanzai Electric Power Technology Development Co ltd; Huzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Priority date: 2021-01-11
Filing date: 2021-01-11
Publication date: 2021-05-11

Abstract

The invention provides a high-availability mutual inductor electronic tag system, which comprises a first tag, a second tag, an equipment protection box, a temperature compensation device and a mobile RFID read-write terminal, wherein the first tag is arranged outside the equipment protection box, power equipment is arranged in the equipment protection box, the second tag is arranged on a shell of the power equipment, the mobile RFID read-write terminal is in communication connection with the first tag and the second tag through radio frequency signals, the first tag and the second tag respectively comprise a receiving antenna, a transmitting antenna and a chip, the receiving antenna and the transmitting antenna are electrically connected with the chip, the chip comprises a modulation circuit, a control circuit, a memory and a processor, the modulation circuit converts induced potential generated by the receiving antenna into direct current to supply power to the chip, the processor controls the output of the transmitting antenna through the control circuit, and the memory stores the identity information of the power equipment or the equipment protection box, the temperature compensation device compensates for the chip supply voltage as the temperature increases.

Description

High-availability mutual inductor electronic tag system

Technical Field

The invention relates to the field of operation and maintenance of power systems, in particular to a high-availability mutual inductor electronic tag system.

Background

Radio Frequency Identification (RFID) is an abbreviation for Radio Frequency Identification. The principle is that non-contact data communication is carried out between the reader and the tag, so that the aim of identifying the target is fulfilled. RFID passive electronic tags have been widely used.

Compared with a low-frequency system, the ultrahigh frequency radio frequency identification system has the advantages of long distance, higher data exchange speed, higher counterfeiting difficulty, stronger external anti-interference capability and small volume, and the application of the ultrahigh frequency system is more extensive along with the reduction of manufacturing cost and the further improvement of high-frequency technology. Common specifications of the UHF RFID system are 430-460 MHz and 860-960 MHz, and the RFID tags are passive antennas and can be manufactured by etching or printing, so the cost is low. The energy supply principle of the passive electronic tag is based on a wireless power transmission mechanism, the passive tag does not have a self-contained power supply, induced electromotive force is generated in an antenna by receiving radio frequency energy transmitted by a reader, and then a direct current power supply is established through voltage doubling rectification.

The RFID electronic tag is applied to the power equipment, so that the working life and identity information of the equipment can be conveniently confirmed through radio frequency identification during maintenance, and an electric power worker can be helped to quickly and accurately distinguish whether the power equipment in front is the target equipment needing maintenance or repair in a work task. Meanwhile, the RFID read-write terminal can be matched with a background communication system, and an information matching triggering mechanism is added, so that the background server can acquire the position of an electric power worker, and the reliability of electric power operation and maintenance work in remote areas is improved.

However, in order to ensure the safety of human bodies and equipment, electric equipment such as mutual inductors and the like are generally installed in equipment protection boxes, the equipment protection boxes are generally box-type structures formed by iron sheets, and play roles of wind prevention, dust prevention, rat prevention, theft prevention and electromagnetic shielding. In addition, because the process of converting electric energy loss into heat energy inevitably exists when electric equipment such as mutual-inductor works, consequently, the temperature on equipment surface can reach hundreds of degrees centigrade, and under this temperature, passive electronic tags's copper resistance can increase for the technical problem that communication distance shortens appears because the energy supply is not enough in the label.

The patent document with the publication number of CN111802832A discloses an RFID intelligent gun cabinet system, which comprises a cabinet body, wherein a cabinet door is rotatably installed on the surface of the cabinet body, an android main control board is installed on the surface of the cabinet door, an LCD display screen is arranged on the surface of the android main control board, a fingerprint acquisition instrument is arranged on the side edge of the LCD display screen, and a password key is arranged at the bottom of the fingerprint acquisition instrument; the middle part of the inner side of the cabinet body is provided with a bottom supporting plate, the cabinet body forms two independent areas through the bottom supporting plate, and each independent area is internally provided with an RFID reader-writer; RFID intelligence rifle cabinet system is on the physical precaution means of traditional iron sheet rifle cabinet, through increasing RFID discernment reading equipment and antenna in the rifle cabinet to increase tall and erect main control board of ann and LCD display screen, under the prerequisite that does not change army's traditional gun and keep with the operation mode, realize the real-time supervision of gun in the storehouse, realize the automatic record of gun business turn over storehouse and at the automatic function such as check in storehouse, can save the time of manual work greatly, further liberate the manpower. However, the invention still does not solve the technical problem that the communication distance is shortened due to insufficient energy supply of the labels under high temperature.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the existing RFID label can not overcome the technical problems of metal electromagnetic shielding and short communication distance due to insufficient functions at high temperature.

In order to solve the above technical problems, the present invention provides a high-availability electronic tag system for a transformer, including a first tag, a second tag, an equipment protection box, a temperature compensation device, and a mobile RFID read/write terminal, where the first tag is installed outside the equipment protection box, the power equipment is installed in the equipment protection box, the second tag is installed on a housing of the power equipment, the mobile RFID read/write terminal establishes a communication connection with the first tag and the second tag through radio frequency signals, the first tag and the second tag each include a receiving antenna, a transmitting antenna, and a chip, the receiving antenna and the transmitting antenna are electrically connected to the chip, the chip includes a modulation circuit, a control circuit, a memory, and a processor, the modulation circuit converts an induced potential generated by the receiving antenna into a direct current to power the chip, the processor controls the output of the transmitting antenna through the control circuit, the memory stores the identity information of the power equipment or the equipment protection box, and the temperature compensation device compensates the power supply voltage of the chip when the temperature rises. According to the invention, when a power grid worker overhauls, the first label needs to be verified firstly, the target equipment in a work task is confirmed to be in the equipment protection box, then the door of the equipment protection box is opened, electromagnetic shielding is removed, and then the second label is verified to confirm which indoor equipment needs to be operated and maintained, wherein the probability of failure and misinformation of the second label, namely the power equipment label and the first label, namely the equipment protection box label is far lower than that of the single label in the prior art.

Preferably, the door lock of the equipment protective box comprises a mechanical part and an electronic part, and the electronic part is electrically connected with the signal transmitting antenna of the first tag. The preferred scheme enables the lock of the protection room to be automatically opened after the first label and the mobile RFID read-write terminal are successfully verified, and can also be unlocked by a traditional key when an electronic system fails.

Preferably, the back surfaces of the first tag and the second tag are respectively provided with a substrate made of wave-absorbing materials, the receiving antenna, the transmitting antenna and the chip are all packaged in the substrate, and the substrate is provided with a positioning mounting hole. Because the metal can absorb and convert the radio frequency signal energy emitted by the mobile RFID read-write terminal into eddy current, the receiving antenna and the transmitting antenna can not be directly arranged on the surface of the metal, and wave-absorbing materials are required to be added, so that the electromagnetic wave energy is concentrated at the antenna.

Preferably, the wave-absorbing material is resin. The resin material is convenient to synthesize and shape, low in cost and good in wave-absorbing effect and metal resistance effect.

Preferably, the temperature compensation device comprises a voltage stabilizer and a plurality of thermocouples, the hot ends of the thermocouples are mounted on the transformer shell, the cold ends of the thermocouples are mounted on the ground, and the thermocouples are connected in series with the chip modulation circuit of the second tag through the voltage stabilizer. The optimal scheme utilizes the self heating of the electrical equipment to convert the unfavorable condition of hindering the information transmission of the electronic tag into the favorable condition of being beneficial to the electronic tag to obtain energy. The number of the thermocouples and the power generation effect are obtained through mathematical calculation according to the annual average working temperature of the equipment, the copper heat resistance change rate of the antenna and the normal working voltage of the chip.

Preferably, the working frequency of the first tag and the working frequency of the second tag are 920-925 MHz, and the mobile RFID reading and writing terminal can be matched with the working frequencies. Higher frequency signals can carry more energy than lower frequency signals.

The substantial effects of the invention are as follows: 1) through mutual matching of the double RFID tags, electromagnetic shielding is removed by automatically opening the door; 2) converting the surface heat energy of the power equipment into a power supply through a thermocouple; the technical problems that the existing RFID label can not overcome metal electromagnetic shielding and the communication distance is shortened due to insufficient functions at high temperature are solved.

Drawings

Fig. 1 is a schematic structural diagram of the first embodiment.

Fig. 2 is a schematic structural diagram of a second tag according to an embodiment.

In the figure: 1. the electronic device comprises a first label, 2, an equipment protection box, 3, a protection box door lock, 4, a mounting hole, 5, a receiving antenna, 6, a transmitting antenna, 7, a resin substrate, 8, a chip, 801, a modulation circuit, 802, a control circuit, 803, a temperature compensation device, 804, a memory, 805 and a processor.

Detailed Description

The following provides a more detailed description of the present invention, with reference to the accompanying drawings.

As shown in fig. 1, an embodiment of the present invention includes an equipment protection box 2 made of stainless steel, a plurality of sets of current transformers are installed in the equipment protection box 2, and the equipment protection box 2 is closed by locking a box door, so as to protect internal equipment from external interference and shield the internal equipment from electromagnetic radiation to the outside. The first embodiment further comprises a mobile RFID read-write terminal, and when a radio frequency wave which is matched with the first label 1 and is sent by the mobile RFID read-write terminal is read by the first label 1, the protective box door lock 3 is unlocked.

As shown in fig. 2, the first embodiment further includes a second tag mounted on the surface of the electrical device, and the second tag includes a receiving antenna 5, a transmitting antenna 6 and a chip 8, the receiving antenna 5 and the transmitting antenna 6 are electrically connected to the chip 8, the chip 8 includes a modulation circuit 801, a control circuit 802, a memory 804 and a processor 805, the modulation circuit 801 converts an induced potential generated by the receiving antenna 5 into a direct current to power the chip 8, the processor 805 controls the output of the transmitting antenna 6 through the control circuit 802, the memory 804 stores the identity information of the electrical device or the device protection box 2, and the temperature compensation device 803 compensates the power supply voltage of the chip 8 when the temperature rises. The temperature compensation device 803 comprises a voltage stabilizer and three thermocouples, wherein the hot ends of the three thermocouples are all installed on the shell of the mutual inductor, the cold ends of the thermocouples are installed on the ground, and the potential output of the thermocouples is connected in series with the chip 8 modulation circuit 801 of the second tag through the voltage stabilizer. The back surfaces of the first label 1 and the second label are respectively provided with a resin substrate, the receiving antenna 5, the transmitting antenna 6 and the chip 8 are all packaged in the resin substrate 7, the substrate is provided with a mounting hole 4, and the labels are mounted on the surface of the mutual inductor through the mounting holes 4.

In the first embodiment, the operating frequencies of the first tag 1 and the second tag are 920-925 MHz, when receiving electromagnetic waves in the above frequency range, the receiving antenna 5 of the tag generates corresponding induced potentials to supply power to the chip 8, the chip 8 provides corresponding output according to the operation result of the processor 805, and the electromagnetic waves emitted by the transmitting antenna 6 are converted into visible information to be provided to a user after being acquired by the mobile RFID read-write terminal.

When the temperature of the mutual inductor rises after the mutual inductor works for a long time, the thermocouple of the hot point can generate electric potential due to the temperature difference between the hot end and the cold end, the electric potential generated by the three thermocouples is connected in series for voltage stabilization and then is connected in series to the output end of the modulation circuit 801, and the reduction of the input voltage of the chip 8 caused by the temperature rise of the resistance in the antenna can be counteracted.

The above embodiment is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the technical scope of the claims.

Claims

1. a high-availability transformer electronic label system, characterized in that: comprising a first label, a second label, an equipment protective box, a temperature compensation device and a mobile RFID read-write terminal, the first label is installed on the equipment Outside the protective box, the electric equipment is installed in the equipment protective box, the second tag is installed on the shell of the electric equipment, and the mobile RFID reading and writing terminal passes through the first tag and the second tag The radio frequency signal establishes a communication connection, the first tag and the second tag both include a receiving antenna, a sending antenna and a chip, the receiving antenna and the sending antenna are both electrically connected to the chip, and the chip includes a modulation A circuit, a control circuit, a memory, and a processor, the modulation circuit converts the induced potential generated by the receiving antenna into direct current to supply power to the chip, and the processor controls the transmission antenna through the control circuit. Output, the memory stores the identity information of the power equipment or the equipment protective box, and the temperature compensation device compensates the supply voltage of the chip when the temperature increases.

2. A high-availability transformer electronic label system according to claim 1, characterized in that: the door lock of the equipment protection box comprises a mechanical part and an electronic part, and the electronic part and the first label are separated from each other. The sending antenna is electrically connected.

3. A high-availability transformer electronic label system according to claim 1, characterized in that: the backs of the first label and the second label are both provided with a substrate made of absorbing material, the receiving antenna, Both the sending antenna and the chip are packaged in the base, and the base is provided with positioning and mounting holes.

4 . The high-availability transformer electronic label system according to claim 3 , wherein the wave absorbing material is resin. 5 .

5. A high-availability transformer electronic label system according to claim 1, wherein the temperature compensation device comprises a voltage stabilizer and a plurality of thermocouples, and the hot end of the thermocouples is installed on the casing of the power equipment On the upper side, the cold end of the thermocouple is installed on the ground, and the thermocouple is connected in series with the chip modulation circuit of the second tag through the voltage stabilizer.

6. a kind of high-availability transformer electronic label system according to claim 1, is characterized in that: the operating frequency of described first label and second label is 920～925MHz, and described mobile RFID reading and writing terminal can match the operating frequency.