Passive multi-state RFID hierarchical feedback method for relay protection

Abstract

The invention relates to the technical field of relay protection monitoring, in particular to a passive multi-state RFID hierarchical feedback method for relay protection, which is realized on the basis of an RFID safety measure device, and the RFID safety measure device comprises an RFID reader-writer, a passive RFID chip, a microswitch, a first antenna and a second antenna, the first antenna, the microswitch and the passive RFID chip are connected in sequence, the second antenna is connected with the passive RFID chip, the RFID reader-writer is used for remotely receiving signals sent by the passive RFID chip through the first antenna and the second antenna and processing the signals, and on the basis, the feedback method comprises the steps that the first antenna, the microswitch and the passive RFID chip are connected in sequence, and the second antenna is connected with the RFID reader-writer. The working state of the RFID safety measure device is judged according to the intensity of signals received by the RFID reader-writer, signal sending and interruption of the first antenna are controlled according to on-off of the microswitch, and the intensity of the signals received by the RFID reader-writer is changed. According to the invention, the working state of the RFID safety measure device can be accurately monitored in real time, real-time feedback can be realized, and maintenance personnel can be reminded in time.

Description

Technical Field

[0001] The present invention relates to the technical field of relay protection monitoring, and specifically relates to a passive multi-state RFID hierarchical feedback method for relay protection. Background Art

[0002] In the maintenance of relay protection in the power system, the secondary safety measure tools are mainly installed on the protection pressure plates to play a role of identification, preventing the disconnected pressure plates from being accidentally restored by others during the maintenance period, and also avoiding omissions during the restoration after the maintenance is completed.

[0003] Traditional secondary safety measure tools rely on manual monitoring, which requires on-site visual observation by staff and cannot provide real-time status feedback. This lack of intelligent monitoring means easily leads to the risk of misoperation. Especially when the staff is fatigued or inattentive, wrongly removing the safety tool may directly affect the equipment and personal safety. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a passive multi-state RFID hierarchical feedback method for relay protection, which accurately and real-time monitors the working state of the RFID safety measure device, and when the working state changes after the RFID safety measure device is removed, it gives real-time feedback and timely reminds the maintenance personnel.

[0005] The technical solution adopted by the present invention is to provide a passive multi-state RFID hierarchical feedback method for relay protection. This method is implemented based on an RFID safety measure device. The RFID safety measure device includes an RFID reader, a passive RFID chip, a micro switch, a first antenna, and a second antenna. The first antenna, the micro switch, and the passive RFID chip are connected in sequence. The second antenna is connected to the passive RFID chip. The RFID reader is used to remotely receive the signals sent by the passive RFID chip through the first antenna and the second antenna and process them.

[0006] On this basis, the feedback method includes:

[0007] Judging the working state of the RFID safety measure device according to the signal strength received by the RFID reader.

[0008] Controlling the signal transmission and interruption of the first antenna according to the opening and closing of the micro switch, and changing the signal strength received by the RFID reader.

[0009] The step of judging the working state of the RFID safety measure device according to the signal strength received by the RFID reader is specifically:

[0010] Defining the signal strength as a strong signal state and a weak signal state;

[0011] Define the working states of the RFID safety device as the normal protection state and the protection release state;

[0012] When the microswitch is closed, both the first antenna and the second antenna are in the signal transmission state, the signal strength received by the RFID reader is in the strong signal state, and the working state of the RFID safety device is the normal protection state;

[0013] When the microswitch is open, the connection between the first antenna and the passive RFID chip is disconnected, the first antenna is in the signal interruption state, the signal strength received by the RFID reader is in the weak signal state, and the state of the RFID safety device is the protection release state.

[0014] There are two sets of the microswitch and the first antenna, including microswitch A, microswitch B, first antenna A and first antenna B. The passive RFID chip, microswitch A and first antenna A are connected in sequence, and the passive RFID chip, microswitch B and first antenna B are connected in sequence. On this basis, judging the working state of the RFID safety device according to the signal strength received by the RFID reader is specifically that,

[0015] Define the signal strength as the strong signal state, the medium signal and the weak signal state;

[0016] Define the states of the RFID safety device as the normal protection state, the ready-to-release protection state and the protection release state;

[0017] When microswitch A and microswitch B are closed, first antenna A, first antenna B and the second antenna are in the signal transmission state, the signal strength received by the RFID reader is in the strong signal state, and the working state of the RFID safety device is the normal protection state;

[0018] When microswitch A or microswitch B is open, first antenna A or first antenna B is in the signal interruption state, the signal strength received by the RFID reader is in the medium signal state, and the state of the RFID safety device is the ready-to-release protection state;

[0019] When microswitch A and microswitch B are open, first antenna A or first antenna B is in the signal interruption state, the signal strength received by the RFID reader is in the weak signal state, and the state of the RFID safety device is the protection release state.

[0020] It also includes a frequency band selection circuit. There are two sets of the microswitch and the first antenna, including microswitch A, microswitch B, first antenna A and first antenna B. The passive RFID chip, microswitch A and first antenna A are connected in sequence, and the passive RFID chip, microswitch B and first antenna B are connected in sequence. The first antenna A, first antenna B and the second antenna adopt multi-frequency antennas,

[0021] On this basis, the working state of the RFID safety device is judged according to the signal strength received by the RFID reader. Specifically,

[0022] The signal strength is defined as a strong signal state, a medium signal, and a weak signal state;

[0023] The state of the RFID safety device is defined as a normal protection state, a ready-to-contact protection state, and a protection release state;

[0024] The signal frequency bands of the first antenna A, the first antenna B, and the second antenna are defined as low-frequency band signals and high-frequency band signals;

[0025] When the microswitch A and the microswitch B are closed, the first antenna A, the first antenna B, and the second antenna are all in the signal constant transmission state of transmitting low-frequency band signals. The signal received by the RFID reader is a low-frequency band signal, the signal strength is in the strong signal state, and the working state of the RFID safety device is the normal protection state;

[0026] When the microswitch A or the microswitch B is disconnected, the first antenna A or the first antenna B is in the signal interruption state. The signal received by the RFID reader is a low-frequency band signal, the signal strength is in the medium signal state, and the state of the RFID safety device is the ready-to-contact protection state;

[0027] When the microswitch A and the microswitch B are disconnected, the first antenna A or the first antenna B is in the signal interruption state. The signal received by the RFID reader is a high-frequency band signal, the signal strength is in the weak signal state, and the state of the RFID safety device is the protection release state.

[0028] The beneficial effect of the present invention is to provide a passive multi-state RFID hierarchical feedback method for relay protection, which combines a microswitch and a passive RFID chip to control the signal strength and signal frequency band of the passive RFID chip, and uses the signal strength and signal frequency band as conditions to judge the working state of the RFID safety device in real time. Description of the Drawings

[0029] Figure 1 It is a system block diagram of the RFID safety device in the present invention. Detailed Embodiments

[0030] Such as Figure 1As shown in the figure, the present invention provides a passive multi-state RFID hierarchical feedback method for relay protection. This method is implemented based on an RFID safety measure device, and the RFID safety measure device includes an RFID reader, a passive RFID chip, a micro switch, a first antenna, and a second antenna. The first antenna, the micro switch, and the passive RFID chip are connected in sequence. The second antenna is connected to the passive RFID chip. The RFID reader is used to remotely receive the signals sent by the passive RFID chip through the first antenna and the second antenna and process them.

[0031] On this basis, the feedback method includes:

[0032] Judging the working state of the RFID safety measure device according to the signal strength received by the RFID reader.

[0033] Controlling the signal transmission and interruption of the first antenna according to the opening and closing of the micro switch, and changing the signal strength received by the RFID reader.

[0034] Embodiment 1, as Figure 1 shown, the judging the working state of the RFID safety measure device according to the signal strength received by the RFID reader is specifically:

[0035] Defining the signal strength as a strong signal state and a weak signal state;

[0036] Defining the working state of the RFID safety measure device as a normal protection state and a protection release state;

[0037] When the micro switch is closed, both the first antenna and the second antenna are in the signal transmission state, the signal strength received by the RFID reader is in the strong signal state, and the working state of the RFID safety measure device is the normal protection state;

[0038] When the micro switch is open, the connection between the first antenna and the passive RFID chip is disconnected, the first antenna is in the signal interruption state, the signal strength received by the RFID reader is in the weak signal state, and the state of the RFID safety measure device is the protection release state.

[0039] Embodiment 2, as Figure 1 shown, there are two groups of the micro switch and the first antenna, including micro switch A, micro switch B, first antenna A, and first antenna B. The passive RFID chip, micro switch A, and first antenna A are connected in sequence. The passive RFID chip, micro switch B, and first antenna B are connected in sequence. On this basis, the judging the working state of the RFID safety measure device according to the signal strength received by the RFID reader is specifically:

[0040] Defining the signal strength as a strong signal state, a medium signal, and a weak signal state;

[0041] Define the states of the RFID safety device as the normal protection state, the ready-to-contact protection state, and the protection release state;

[0042] When microswitch A and microswitch B are closed, the first antenna A, the first antenna B, and the second antenna are in the signal transmission state, the signal strength received by the RFID reader is in the strong signal state, and the working state of the RFID safety device is the normal protection state;

[0043] When microswitch A or microswitch B is open, the first antenna A or the first antenna B is in the signal interruption state, the signal strength received by the RFID reader is in the medium signal state, and the state of the RFID safety device is the ready-to-contact protection state;

[0044] When microswitch A and microswitch B are open, the first antenna A or the first antenna B is in the signal interruption state, the signal strength received by the RFID reader is in the weak signal state, and the state of the RFID safety device is the protection release state.

[0045] Embodiment 3, as Figure 1 shown, further includes a frequency band selection circuit. There are two sets of the microswitch and the first antenna, including microswitch A, microswitch B, first antenna A, and first antenna B. The passive RFID chip, microswitch A, and first antenna A are connected in sequence, and the passive RFID chip, microswitch B, and first antenna B are connected in sequence. The first antenna A, the first antenna B, and the second antenna adopt a multi-frequency antenna. By simultaneously closing and opening microswitch A and microswitch B, the frequency band selection circuit is controlled to switch the signal frequency band;

[0046] On this basis, judging the working state of the RFID safety device according to the signal strength received by the RFID reader, specifically,

[0047] Define the signal strength as the strong signal state, the medium signal, and the weak signal state;

[0048] Define the states of the RFID safety device as the normal protection state, the ready-to-contact protection state, and the protection release state;

[0049] Define the signal frequency bands of the first antenna A, the first antenna B, and the second antenna as the low-frequency band signal and the high-frequency band signal;

[0050] When microswitch A and microswitch B are closed, the first antenna A, the first antenna B, and the second antenna are all in the signal constant transmission state of transmitting the low-frequency band signal. The signal received by the RFID reader is the low-frequency band signal, the signal strength is the strong signal state, and the working state of the RFID safety device is the normal protection state;

[0051] When the micro switch A or the micro switch B is disconnected, the first antenna A or the first antenna B is in a signal interruption state. The signal received by the RFID reader is a low-frequency band signal, the signal strength is in a medium signal state, and the state of the RFID safety device is in a ready-to-contact protection state;

[0052] When the micro switch A and the micro switch B are disconnected, the first antenna A or the first antenna B is in a signal interruption state. The signal received by the RFID reader is a high-frequency band signal, the signal strength is in a weak signal state, and the state of the RFID safety device is in a protection release state.

[0053] The present invention combines a micro switch and a passive RFID chip. After the secondary safety measure tool is installed on the relay protection, for example, on the relay protection pressure plate, the trigger button on the micro switch is pressed, and the micro switch is in a closed state. The first antenna and the passive RFID chip are conducted. When the secondary safety measure tool is removed and the pressure plate is mistakenly restored, the trigger button of the micro switch pops up, the micro switch becomes an interruption state, the first antenna and the passive RFID chip are disconnected, and real-time feedback is performed in this way. The RFID reader identifies through the change in the signal strength received, and gives timely reminders to the maintenance personnel. On this basis, combined with the signal frequency band received by the RFID reader as a condition, the working state of the RFID safety device, that is, the working state of the pressure plate, is jointly judged to further improve the monitoring accuracy and effectively avoid misjudgment caused by signal interference when the signal strength changes. At the same time, whether the first antenna is in a closed or disconnected state, the second antenna always maintains the RFID signal transmission state, ensuring that the RFID safety device is always under monitoring.

[0054] RFID reader: Responsible for receiving and processing signals from the passive RFID chip, and judging the state of the RFID safety device according to the received signal strength and frequency changes, so as to determine the state of the relay protection pressure plate. The RFID reader analyzes the strength and frequency changes of the signal, and gives real-time feedback on the state of the device to ensure the accuracy and reliability of the monitoring system.

[0055] Micro switch: The opening and closing state of the micro switch determines the connection of the antenna and the change of the signal. When the state of the device changes, the micro switch adjusts the working mode of the antenna through physical switching, thereby changing the strength and frequency of the RFID signal. For example, in the "ready to release protection" state, the micro switch only adjusts the impedance of the antenna, while in the "protection release" state, it switches the frequency of the RFID antenna.

[0056] Signal strength: By closing and disconnecting the micro switch, the impedance of the antenna is adjusted, and the strength of the RFID signal is changed to achieve accurate state recognition.

[0057] Signal frequency band: By closing and opening the micro switch, the RFID antenna is triggered to select different signal frequencies to achieve more accurate status recognition.

[0058] Through the coordinated cooperation of signal strength and signal frequency band in the present invention, the RFID reader can more accurately distinguish different states, avoid signal interference, and enhance the stability and accuracy of the system.

[0059] Through the precise status feedback mechanism in the present invention, various states of the device can be monitored and fed back in real time. This mechanism not only improves the monitoring accuracy of the relay protection system, but also can timely remind the operator when the state changes, preventing misoperation or equipment failure.

Claims

1. A passive multi-state RFID hierarchical feedback method for relay protection, which is implemented based on an RFID protection device and is characterized by: The RFID security device includes an RFID reader / writer, a passive RFID chip, a micro switch, a first antenna and a second antenna. The first antenna, the micro switch and the passive RFID chip are connected in sequence, and the second antenna is connected to the passive RFID chip. The RFID reader / writer is used to remotely receive and process the signal sent by the passive RFID chip through the first antenna and the second antenna. On this basis, the feedback method includes, The working status of the RFID security device is determined based on the signal strength received by the RFID reader. The signal transmission and interruption of the first antenna are controlled according to the opening and closing of the micro switch, thereby changing the signal strength received by the RFID reader.

2. The passive multi-state RFID hierarchical feedback method for relay protection according to claim 1, characterized in that: The method of judging the working state of the RFID security device according to the signal strength received by the RFID reader / writer is as follows: The signal strength is defined as a strong signal state and a weak signal state; The working state of the RFID security device is defined as the normal protection state and the protection release state; When the micro switch is closed, the first antenna and the second antenna are both in the signal sending state, the signal strength received by the RFID reader is in the strong signal state, and the working state of the RFID security device is in the normal protection state; When the micro switch is disconnected, the first antenna is disconnected from the passive RFID chip, the first antenna is in a signal interruption state, the signal strength received by the RFID reader is in a weak signal state, and the state of the RFID security device is a protection release state.

3. The passive multi-state RFID hierarchical feedback method for relay protection according to claim 1, characterized in that: The micro switch and the first antenna are provided with two groups, including micro switch A, micro switch B, first antenna A and first antenna B, the passive RFID chip, micro switch A and first antenna A are connected in sequence, and the passive RFID chip, micro switch B and first antenna B are connected in sequence. On this basis, the working state of the RFID security device is judged according to the signal strength received by the RFID reader, specifically, The signal strength is defined as a strong signal state, a medium signal, and a weak signal state; The states of the RFID security device are defined as normal protection state, ready-to-contact protection state and protection release state; When the micro switch A and the micro switch B are closed, the first antenna A, the first antenna B and the second antenna are in a signal sending state, the signal strength received by the RFID reader is a strong signal state, and the working state of the RFID security device is a normal protection state; When the micro switch A or the micro switch B is disconnected, the first antenna A or the first antenna B is in a signal interruption state, the signal strength received by the RFID reader is in a medium signal state, and the state of the RFID security device is in a ready-to-contact protection state; When the micro switch A and the micro switch B are disconnected, the first antenna A or the first antenna B is in a signal interruption state, the signal strength received by the RFID reader is in a weak signal state, and the state of the RFID security device is a protection release state.

4. The passive multi-state RFID hierarchical feedback method for relay protection according to claim 1, characterized in that: It also includes a frequency band selection circuit, wherein the micro switch and the first antenna are provided with two groups, including a micro switch A, a micro switch B, a first antenna A and a first antenna B, the passive RFID chip, the micro switch A and the first antenna A are connected in sequence, the passive RFID chip, the micro switch B and the first antenna B are connected in sequence, the first antenna A, the first antenna B and the second antenna are multi-frequency antennas, and the frequency band selection circuit is controlled to switch the signal frequency band by closing and opening the micro switch A and the micro switch B at the same time; On this basis, the working state of the RFID security device is determined according to the signal strength received by the RFID reader, specifically, The signal strength is defined as a strong signal state, a medium signal, and a weak signal state; The states of the RFID security device are defined as normal protection state, ready-to-contact protection state and protection release state; The signal frequency bands of the first antenna A, the first antenna B and the second antenna are defined as low-frequency band signals and high-frequency band signals; When the micro switch A and the micro switch B are closed, the first antenna A, the first antenna B and the second antenna are all in a signal normal transmission state of sending low-frequency signals, the signal received by the RFID reader is a low-frequency signal, the signal strength is a strong signal state, and the working state of the RFID security device is a normal protection state; When the micro switch A or the micro switch B is disconnected, the first antenna A or the first antenna B is in a signal interruption state, the signal received by the RFID reader is a low-frequency signal, the signal strength is a medium signal state, and the state of the RFID security device is ready for contact protection; When micro switch A and micro switch B are disconnected, the first antenna A or the first antenna B is in a signal interruption state, the signal received by the RFID reader is a high frequency signal, the signal strength is a weak signal state, and the state of the RFID security device is a protection release state.

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