Micro-energy power supply based power switch cabinet contact temperature measurement method and system

Abstract

The application discloses a micro-energy power taking based power switch cabinet contact temperature measuring method and system, and belongs to the technical field of intelligent switch cabinets. The system is used for realizing the method. In the method, electromagnetic waves generated by an exciter module are used for wirelessly supplying power to multiple temperature measuring sensor modules. The temperature measuring sensor modules obtain electric energy, store the electric energy, upload energy storage unit voltage recovery time data and contact temperature detection results to a control module. The control module identifies target sensor modules which need to be preferentially supplied with electric energy according to the voltage recovery time data and the contact temperature detection results. The exciter module performs any of the following actions on the target sensor modules: adjusting the beam direction of the electromagnetic waves emitted by the exciter module, increasing the power of the electromagnetic waves emitted by the exciter module, so as to improve the electric energy supplement intensity of the exciter module on the target sensor modules. The scheme aims to improve the operation stability of the temperature measuring sensor modules in the cabinet environment.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of intelligent switch cabinets, in particular to a power switch cabinet contact temperature measurement method and system based on micro-energy power taking. BACKGROUND

[0002] A switch cabinet is a key device in a power system, and the contact resistance of the moving and static contact connection part may increase due to aging, loosening and other reasons in long-term operation, leading to overheating and even fire and large-area power outage accidents, so it is crucial to monitor the temperature of the switch cabinet contact in real time.

[0003] The existing contact temperature measurement methods and main features are as follows:

[0004] Infrared temperature measurement has the difficulty of obtaining installation space in the switch cabinet, and the installation outside the cabinet needs to be opened later, which is easy to cause monitoring blind area;

[0005] Optical fiber temperature measurement needs to lay optical fibers, has high installation requirements, has great difficulty in use on the moving contact and has high failure rate and high cost;

[0006] Internal battery-powered wireless temperature measurement has the problems of limited service life of the built-in battery, safety hazards in high-temperature environments, the need for regular maintenance, and the failure of traditional batteries on the moving contact due to the action of the moving contact;

[0007] CT power taking wireless temperature measurement has the problems of great installation limitations, the inability to maintain monitoring under no load or light load, and great difficulty in use on the moving contact;

[0008] Surface acoustic wave temperature measurement (SAW passive wireless temperature measurement) has the problems of unstable signal, the inability of traditional schemes to identify ID, and high system debugging difficulty;

[0009] Radio frequency temperature measurement (RFID passive wireless temperature measurement) has the problems of high installation difficulty, short service life, and great influence of temperature on identification distance.

[0010] Specifically, the patent document with the application number CN201410358020.6 and the invention name of switch cabinet surface acoustic wave (SAW) temperature measurement system provides a passive temperature measurement scheme based on surface acoustic wave technology; the patent document with the application number CN202322970482.0 and the invention name of a temperature and pressure measurement complete device for switch cabinet wye contact provides a passive temperature measurement scheme based on wireless power supply box for temperature and pressure measurement sensor wireless power supply, and specifically discloses that the wireless power supply box 2 generates a magnetic field with a specific resonant frequency around the switch cabinet through the transmitting coil 23, the receiving coil 13 resonates with the magnetic field generated by the wireless power supply box 2 under the action of the resonant capacitor 14, an alternating current is generated in the receiving coil 13, and the entire temperature and pressure measurement sensor 1 is powered through the action of the electric energy conditioning module 15, thereby completing the wireless power supply link.

[0011] The existing passive temperature measurement sensor module installed on the switch cabinet contact effectively solves the maintenance problems, safety hazards and unreliable problems of being applied to the movable contact caused by simply relying on battery power supply, and further development of the switch cabinet contact passive temperature measurement technology undoubtedly can further promote the development of power monitoring technology. SUMMARY

[0012] In view of the above problems of developing switch cabinet contact passive temperature measurement technology, the present application provides a power switch cabinet contact temperature measurement method and system based on micro-energy power taking, which aims to improve the running stability of the temperature measurement sensor module in the cabinet environment.

[0013] The purpose of the present application is mainly realized by the following technical scheme: a power switch cabinet contact temperature measurement method based on micro-energy power taking, which is based on the electromagnetic waves generated by the exciter module to wirelessly power the temperature measurement sensor module installed on the switch cabinet contact, and the temperature measurement sensor module is used for switch cabinet contact temperature measurement. In this method, the exciter module powers multiple temperature measurement sensor modules, and the beam direction and / or transmission power of the electromagnetic waves generated by the exciter module are adjustable.

[0014] The temperature measurement sensor module obtains electric energy based on the electromagnetic waves and stores the electric energy through the energy storage unit, and uploads the voltage recovery time data of the energy storage unit and the collected contact temperature detection results to the control module during the working process;

[0015] The control module receives the voltage recovery time data and the contact temperature detection results, judges the electric energy acquisition situation of each sensor module according to the voltage recovery time data, judges the subsequent temperature detection frequency of each sensor module according to the contact temperature detection results, and identifies the target sensor module that needs to be preferentially supplemented with electric energy according to the electric energy acquisition situation and the temperature detection frequency.

[0016] The exciter module performs any of the following actions on the target sensor module:

[0017] Based on the orientation of the target sensor module, the control module sends a first control command to the exciter module. The first control command is used to adjust the beam direction of the electromagnetic waves emitted by the exciter module in order to enhance the power supply intensity of the exciter module to the target sensor module.

[0018] The control module sends a second control command to the exciter module. The second control command is used to increase the power of the electromagnetic waves emitted by the exciter module, so as to enhance the power supply intensity of the exciter module to the target sensor module.

[0019] This solution can be specifically applied as follows: The exciter module is powered by DC (e.g., 24VDC) and emits an ultra-high frequency radio frequency signal (e.g., 840MHz~960MHz). The ultra-high frequency radio frequency signal serves as the electromagnetic wave that is the energy source for the temperature sensor module. The temperature sensor module has a built-in micro-energy harvesting chip that obtains electrical energy based on the electromagnetic wave. It also has a built-in energy storage unit that stores the acquired electrical energy and supplies power to the power-consuming components in the temperature sensor module. Preferably, especially when used on moving contacts, to ensure the stability of the energy storage unit under vibration conditions, the energy storage unit is preferably an energy storage capacitor. It also has a built-in measurement and processing module for measuring the voltage of the energy storage unit and obtaining voltage recovery time data, and a built-in module for realizing voltage recovery... The wireless communication unit sends the time data and contact temperature detection results to the control module. The wireless communication unit has data transmission and reception functions, which is used by the control module to send control commands to the temperature sensor module. It also has a built-in temperature sensor for obtaining the contact temperature detection results. The exciter module supplies power to multiple temperature sensor modules. Multiple temperature sensor modules are distributed within the signal range of the exciter module. These temperature sensor modules obtain power based on their respective micro-energy harvesting chips and store it in the energy storage unit. The beam direction adjustment can be achieved based on the phased array antenna or other antenna array configured in the exciter module. The transmit power adjustment can be achieved based on the control circuit that realizes the output power adjustment.

[0020] The voltage recovery time data reflects the voltage recovery capability of the energy storage unit. When the voltage recovery time is too long, it indicates that the energy recovery of the corresponding temperature sensor module is too slow. This can lead to increased energy consumption of the energy storage unit by the power-consuming components during temperature measurement, potentially extending the interval between two consecutive temperature measurements or even preventing further temperature measurement. The contact temperature detection result reflects the current temperature of the measured contact. If the current temperature is too high or rises rapidly, the temperature detection frequency needs to be increased to promptly detect when the contact has reached a dangerous temperature, allowing maintenance personnel or the grid automatic control system to respond in a timely manner. In this context, the temperature sensor module on the corresponding contact requires higher power supply support. If the energy storage unit cannot receive efficient power replenishment, it cannot provide energy for a higher temperature detection frequency. Both of these situations affect the operational stability of the temperature sensor assembly in the cabinet environment, causing the temperature measurement frequency to fall short of expectations, or even causing the temperature sensor module to fail due to insufficient energy.

[0021] Unlike traditional passive power supply applications, which are limited by the installation space available for temperature sensor modules by the moving and stationary contacts and the vibrations that inevitably occur during the operation of the switchgear, temperature measurement of power switchgear contacts relies on the miniaturization of temperature sensor modules. In passive power supply solutions, energy storage units should not be large in size or capacity (it is preferable to use small-sized, relatively large-capacity supercapacitors that are stable under vibration conditions).

[0022] In this solution, the control module receives the voltage recovery time data and the contact temperature detection results, identifies the target sensor module that needs priority power replenishment, and then acts on the exciter module with a first control command and / or a second control command to enhance the power replenishment intensity of the exciter module to the target sensor module. This aims to address the following issues:

[0023] When the temperature sensor module used in the switchgear cabinet is powered by passive micro-energy based on the exciter module, the complexity and variability of the electromagnetic environment inside the cabinet will lead to unstable power extraction by the micro-energy extraction chip. The electromagnetic waves generated by the exciter module will produce areas of strong and weak energy signals in the cabinet environment due to reflection and absorption. The operation of the switchgear will create electromagnetic transients in the cabinet environment, and electromagnetic fields will also be generated during stable operation outside the operation process. These factors can all interfere with the function of the exciter module for the temperature sensor module, leading to a decrease in the energy harvesting efficiency of the micro-energy extraction chip. When the module is used on the moving contact, because the moving contact has different positions in different states, the change of the moving contact position may also cause the temperature sensor module to be in the weak energy signal area or even the blind area, resulting in weakened or interrupted energy harvesting by the temperature sensor module. Therefore, although the use of the exciter module solves the problem of micro-energy source and solves the problem of micro-energy intermittency in the cabinet as a whole, the switch cabinet has the characteristic of many temperature measurement points. When wireless power is provided to these temperature measurement points, the energy received by the temperature sensor modules distributed in different positions in the cabinet is easily affected by the cabinet environment and exhibits unstable energy reception and random energy reception characteristics.

[0024] This solution is based on the intermittent measurement of contact temperature by the temperature sensor module. However, during the wake-up (temperature measurement) period of the temperature sensor module, especially during the transmission of wireless signals, it is in a state of instantaneous high power consumption. If the energy storage unit is not sufficiently charged when the next wake-up is performed, it will cause the voltage of the energy storage unit to collapse, resulting in temperature measurement failure. If the energy storage unit is not sufficiently charged before the temperature detection frequency is increased, the expected temperature detection frequency may not be achieved.

[0025] In this solution, the target sensor module with insufficient energy replenishment of the energy storage unit is detected based on the voltage recovery time data, and the subsequent high-power target sensor module is detected based on the contact temperature detection results. For these target sensor modules, the energy resource allocation is optimized by adjusting the beam direction and / or electromagnetic wave power, so as to avoid system reliability risks caused by insufficient energy of the temperature sensor module at the contact temperature detection point, and switch cabinet safety risks caused by untimely contact temperature measurement.

[0026] As those skilled in the art know, the electromagnetic energy density at the installation locations of each temperature sensor module, from the exciter module to the temperature sensor module, is affected by various factors such as distance, shielding degree, and multipath effect. When the power supply intensity of the target sensor module is increased, it will also affect the power supply of other sensor modules. In order to reduce the control difficulty of the exciter module and the adjustment frequency of the exciter module, it is preferable to arrange two or more exciter modules in the switch cabinet, with some exciter modules serving as backup modules. When the number of target sensor modules exceeds the set number, the backup modules are activated to reduce the impact of the action of a single exciter module on the overall power supply of the temperature sensor modules.

[0027] For each temperature sensor module, after installation in the cabinet, an independent ID information can be configured for each temperature sensor module to distinguish them. The temperature sensor module with independent ID information can be configured in the system by manual calibration or by estimating the azimuth information based on the different antenna signal strengths of the exciter and configuring it in the system. This allows the corresponding target sensor module to be enhanced and recharged by adjusting the beam direction azimuth angle under the action of the first control command. Under the action of enhancing and recharging the target sensor module based on the second control command, the micro-energy density of the installation position of each temperature sensor module can be improved as a whole.

[0028] In practical applications, the fundamental purpose of contact temperature measurement is to ensure the safety of the power system. Therefore, for the two types of target sensor modules that need priority power replenishment based on voltage recovery time data and contact temperature detection results, the preferred approach is to prioritize the power replenishment of the target sensor modules, determining the target sensor modules identified based on contact temperature detection results as high priority and the target sensor modules identified based on voltage recovery time data as low priority. This prioritizes the temperature sensor modules that require high-frequency temperature measurement and timely acquisition of abnormal contact temperatures to ensure the safety of the power system.

[0029] In practical applications, such as using temperature data aggregation terminals to statistically analyze contact temperature measurement results for analyzing the changing patterns of contact states of each contact, the temperature data aggregation terminal can either retrieve the contact temperature detection results from the control module, or the control module can retrieve the contact temperature detection results from the temperature data aggregation terminal after the contact temperature detection results are sent to the temperature data aggregation terminal.

[0030] As a further technical solution to the aforementioned method for measuring the temperature of power switchgear contacts based on micro-energy extraction:

[0031] The identification method of the target sensor module is as follows:

[0032] If the voltage recovery time data of the temperature sensor module exceeds the preset time threshold configured for it, it is determined that the power acquisition is insufficient, and the temperature sensor module is identified as the target sensor module.

[0033] If the contact temperature detection result of the temperature sensor module exceeds the preset temperature threshold configured for it, it is determined that the subsequent temperature detection frequency of the sensor module needs to be increased, and the temperature sensor module is identified as the target sensor module.

[0034] For temperature sensor modules whose contact temperature detection results exceed the preset temperature threshold, the temperature detection frequency is increased in subsequent temperature detection processes.

[0035] In the above scheme, the target sensor module with insufficient power acquisition is identified by comparing the voltage recovery time data with a preset duration threshold. Similarly, the target sensor module whose temperature detection frequency needs to be increased is identified by comparing the contact temperature detection result with a preset temperature threshold. This target sensor module determination logic is simple and can be implemented by embedding a simple logic circuit within the temperature sensor module. It reduces the wireless signal transmission frequency of the temperature sensor module to save energy. However, regarding the timeliness of power replenishment, if the time it takes for the energy storage unit to recover to a preset voltage after high-power discharge is used as the voltage recovery time data, the acquisition time of the voltage recovery time data is relatively long, which affects the duration of the energy replenishment window for the energy storage unit. If the control is inadequate, such as when the base temperature measurement frequency configured for the temperature sensor module is high, it is preferable to use the following judgment method based on a preset voltage growth threshold. Similarly, if the current temperature of the contact is lower than the preset temperature threshold, and the danger temperature set for the contact is higher than the preset temperature threshold (the preset temperature threshold serves as a warning temperature when the contact temperature is about to reach the danger temperature), since the difference between the current temperature and the preset temperature threshold and the danger temperature of the contact is greater, using the current temperature of the contact exceeding the preset temperature threshold as the judgment condition for the target sensor module is also not conducive to the energy storage unit's energy replenishment window duration. If the temperature detection frequency increases significantly, it is preferable to use the following method based on a preset temperature growth threshold to determine the target sensor module.

[0036] In the above scheme, the temperature detection frequency of the corresponding temperature sensor module is increased based on the judgment result of the preset temperature threshold. The aim is to shorten the interval between two adjacent contact temperature measurements, so as to enhance temperature monitoring by increasing the detection frequency.

[0037] The identification method of the target sensor module is as follows:

[0038] If the voltage recovery time data of the temperature sensor module is lower than the preset voltage growth threshold configured for it, it is determined that the power acquisition is insufficient, and the temperature sensor module is identified as the target sensor module.

[0039] If the contact temperature detection result of the temperature sensor module exceeds the preset temperature increase threshold configured for it, it is determined that the subsequent temperature detection frequency of the sensor module needs to be increased, and the temperature sensor module is identified as the target sensor module.

[0040] For temperature sensor modules whose contact temperature detection results exceed the preset temperature threshold, the temperature detection frequency is increased in subsequent temperature detection processes.

[0041] As described above, using preset voltage growth thresholds and preset temperature growth thresholds as the criteria for determining the target sensor module is one approach: by monitoring voltage and temperature at least twice consecutively, the voltage recovery status and contact temperature growth status of the energy storage unit can be determined based on the voltage and temperature detection results obtained at different time points. When the voltage recovery rate is lower than the target threshold and the contact temperature growth rate exceeds the safety threshold, it is considered that the energy storage unit is insufficiently recharged or that the temperature sensor module is about to conduct higher frequency temperature measurements. Under this target sensor module identification method, the target sensor module can be identified more quickly, thus providing a longer recharge window for the energy storage unit of the target sensor module.

[0042] The target sensor modules identified based on the power acquisition situation are classified as the first target sensor modules, and the target sensor modules identified based on the contact temperature detection results are classified as the second target sensor modules.

[0043] During the process of enhancing the power supply intensity of the exciter module to the target sensor module, the power supply priority of the second target sensor module is higher than that of the first target sensor module.

[0044] The above solution involves classifying the energy replenishment priorities of target sensor modules and assigning higher energy replenishment priorities to temperature sensor modules that detect potential overheating of contacts. By increasing the temperature acquisition frequency of dangerous contacts, a more reliable guarantee is provided for the safety of switchgear equipment.

[0045] The temperature sensor module sends the voltage recovery time data and contact temperature detection results to the control module through its built-in wireless communication unit;

[0046] Each temperature sensor module has a built-in wireless communication unit, which includes a first wireless communication unit and a second wireless communication unit.

[0047] The first wireless communication unit is configured such that its signal is shielded inside the switch cabinet and received by a data collector installed inside the switch cabinet. The data collector relays the data to the control module outside the switch cabinet via a wired communication interface.

[0048] The second wireless communication unit is configured such that its signal is able to pass through the switch cabinet and be directly received by a control module located outside the switch cabinet.

[0049] In the above scheme, a wireless communication unit is used to establish a data connection between the temperature sensor module and the control module. This aims to achieve a wireless and passive connection for the temperature sensor module. The wireless communication unit is configured to include a first wireless communication unit and a second wireless communication unit. This provides a technical solution that uses different signal frequencies to give the wireless communication units redundant communication capabilities, ensuring a reliable signal connection between the temperature sensor module and the control module. Specifically, for the first wireless communication unit, its communication channel with the control module is as follows: the first wireless communication unit and the data acquisition unit transmit data wirelessly, and further, through wired communication, a wired relay method is used to establish a signal connection between the data acquisition unit and the control module. This communication channel aims to utilize the shielding effect of the switch cabinet's metal enclosure on the wireless signal to ensure communication quality with the data acquisition unit, and further utilizes the anti-interference characteristics of the wired relay itself to ensure communication quality with the control module. For the second wireless communication unit, the second wireless communication unit directly communicates wirelessly with the control module. In practical applications, it serves as a backup communication channel after the communication channel of the first wireless communication unit fails, ensuring basic data transmission capabilities.

[0050] The first wireless communication unit is configured as the default communication unit on the wireless communication unit and is used to transmit the voltage recovery time data and the contact temperature detection result;

[0051] The control module is configured to: when a fault is detected in the communication path through the first wireless communication unit and / or the data collector, activate the second wireless communication unit as an emergency communication unit and use it to transmit the voltage recovery time data and the contact temperature detection results.

[0052] The above scheme is a specific communication strategy for the first and second wireless communication units. The default communication unit is the regular communication unit, and the emergency communication unit is the backup communication unit. The first wireless communication unit is configured so that its signal is shielded within the switch cabinet, while the second wireless communication unit is configured so that its signal can pass through the switch cabinet. This indicates that the signal frequency of the first wireless communication unit is higher than that of the second wireless communication unit, such as using 2.4GHz and 433MHz signals respectively. The reason for using the first wireless communication unit as the default communication unit is that, on the one hand, when there are many temperature measurement points in the cabinet (such as a design that supports up to 200 temperature measurement points for data access), the data collector actively and in turn queries the sensor module on each contact. Since the complete data request-response cycle can be completed within milliseconds, this polling mechanism and communication delay can effectively avoid data packet collisions caused by multiple sensor modules sending data simultaneously. That is, the star network formed by the first wireless communication unit and the data collector in the cabinet... This approach avoids wireless signal conflicts between multiple temperature sensor modules, ensuring real-time and reliable data transmission. Furthermore, the use of external wired relay signals prevents interference from voltage recovery time data and contact temperature detection results to the external communication environment. The shielding of the cabinet and the anti-interference capabilities of the wired data relay also prevent external signals from interfering with the control module's received signals. Using the second wireless communication unit as a backup utilizes its ability to directly penetrate the cabinet, forming an emergency communication unit and establishing redundant communication channels when the default communication unit fails. This ensures the control module has basic data acquisition capabilities and avoids the risks associated with using the second wireless communication unit as a regular communication unit, where data (including data from temperature sensor modules and other sources in the environment) is prone to collisions during transmission, leading to data loss or high latency, especially when there are many temperature measurement points. This reduces the demands on the system's data transmission processing mechanism.

[0053] The data acquisition unit is configured to communicate with each temperature sensor module in a polling manner via the first wireless communication unit;

[0054] When the temperature sensor module detects that the contact temperature exceeds a preset temperature threshold or a preset temperature increase threshold, the temperature sensor module actively sends the contact temperature detection result to the control module through the first wireless communication unit and / or the second wireless communication unit.

[0055] In the above scheme, for the star-shaped communication network established between the first wireless communication unit and the data acquisition unit in each temperature sensor module, an active and orderly data channel is established in a polling manner. This aims to avoid signal conflicts between data from different temperature sensor modules and ensure the real-time acquisition of data from the temperature sensor modules. The above active transmission of contact temperature detection results is as follows: when the contact temperature is determined to be abnormal based on the comparison result between the contact temperature detection result and the preset temperature threshold or the preset temperature increase threshold, in order to improve the guarantee capability for the safe operation of the switchgear, an emergency communication mechanism is triggered to report the contact temperature detection result in a timely manner.

[0056] The temperature sensor module is configured such that when the communication path between the first wireless communication unit and the data collector is normal, the second wireless communication unit is in a sleep state.

[0057] The control module is configured to send a wake-up signal to the faulty temperature sensor module when the fault is detected. The temperature sensor module is configured to wake up its second wireless communication unit after receiving the wake-up signal to send voltage recovery time data and contact temperature detection results.

[0058] The above scheme provides a specific working and sleep mechanism for the wireless communication unit, which aims to reduce unnecessary power consumption of the wireless communication unit so as to ensure that the temperature sensor module can work stably for a long time under the micro-energy power draw from the electromagnetic waves emitted by the exciter module. In specific applications, the second wireless communication unit is set to wake up based on a wake-up circuit with relatively low sleep power consumption.

[0059] The first wireless communication unit of the temperature sensor module is configured to include a sleep state and a working state. The first wireless communication unit is configured to switch between the sleep state and the working state within a preset time window, or to switch from the sleep state to the working state after receiving a wake-up command from the collector.

[0060] The temperature sensor module is configured to dynamically adjust the time window according to the instructions issued by the control module to the temperature sensor module.

[0061] In the above scheme, the sleep and working states configured for the first wireless communication unit are designed to manage the power consumption of the first wireless communication unit and provide a management strategy based on time windows and wake-up commands to ensure that the temperature sensor module is in a low-power state during non-working hours. The dynamic adjustment of the time window means that the control module can dynamically adjust the working strategy of the temperature sensor module via commands when an abnormal contact temperature is detected, based on the contact temperature detection results, thereby adjusting the sleep and working states to meet emergency temperature measurement needs.

[0062] This solution also relates to a power switchgear contact temperature measurement system based on micro-energy extraction, which is used to implement the method described in any of the above.

[0063] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0064] This solution detects target sensor modules with insufficient energy replenishment in the energy storage unit based on voltage recovery time data, and identifies subsequent high-power target sensor modules based on contact temperature detection results. For these target sensor modules, energy resource allocation is optimized by adjusting beam direction and / or electromagnetic wave power to avoid potential system reliability risks due to insufficient energy of temperature sensor modules at contact temperature detection points, and potential switchgear safety risks due to untimely contact temperature measurement. Attached Figure Description

[0065] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0066] Figure 1 This is a flowchart of a specific embodiment of the power switchgear contact temperature measurement method based on micro-energy extraction according to the present invention;

[0067] Figure 2 This is a structural topology diagram of a specific embodiment of the power switch cabinet contact temperature measurement system based on micro-energy extraction described in this invention. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0069] Example 1:

[0070] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a method for measuring the temperature of power switchgear contacts based on micro-energy extraction. This method uses electromagnetic waves generated by an exciter module to wirelessly power temperature sensor modules installed on the switchgear contacts. The temperature sensor modules are used to measure the temperature of the switchgear contacts. In this method, the exciter module powers multiple temperature sensor modules, and the beam direction and / or transmission power of the electromagnetic waves generated by the exciter module are adjustable.

[0071] The temperature sensor module obtains electrical energy based on the electromagnetic waves and stores the electrical energy through the energy storage unit. During operation, it uploads the voltage recovery time data of the energy storage unit and the collected contact temperature detection results to the control module.

[0072] The control module receives the voltage recovery time data and the contact temperature detection result, and determines the power acquisition status of each sensor module based on the voltage recovery time data, determines the subsequent temperature detection frequency of each sensor module based on the contact temperature detection result, and identifies the target sensor module that needs to be prioritized for power replenishment based on the power acquisition status and temperature detection frequency.

[0073] The exciter module performs any of the following actions on the target sensor module:

[0074] Based on the orientation of the target sensor module, the control module sends a first control command to the exciter module. The first control command is used to adjust the beam direction of the electromagnetic waves emitted by the exciter module in order to enhance the power supply intensity of the exciter module to the target sensor module.

[0075] The control module sends a second control command to the exciter module. The second control command is used to increase the power of the electromagnetic waves emitted by the exciter module, so as to enhance the power supply intensity of the exciter module to the target sensor module.

[0076] This solution can be specifically applied as follows: The exciter module is powered by DC (e.g., 24VDC) and emits an ultra-high frequency radio frequency signal (e.g., 840MHz~960MHz). The ultra-high frequency radio frequency signal serves as the electromagnetic wave that is the energy source for the temperature sensor module. The temperature sensor module has a built-in micro-energy harvesting chip that obtains electrical energy based on the electromagnetic wave. It also has a built-in energy storage unit that stores the acquired electrical energy and supplies power to the power-consuming components in the temperature sensor module. Preferably, especially when used on moving contacts, to ensure the stability of the energy storage unit under vibration conditions, the energy storage unit is preferably an energy storage capacitor. It also has a built-in measurement and processing module for measuring the voltage of the energy storage unit and obtaining voltage recovery time data, and a built-in module for realizing voltage recovery... The wireless communication unit sends the time data and contact temperature detection results to the control module. The wireless communication unit has data transmission and reception functions, which is used by the control module to send control commands to the temperature sensor module. It also has a built-in temperature sensor for obtaining the contact temperature detection results. The exciter module supplies power to multiple temperature sensor modules. Multiple temperature sensor modules are distributed within the signal range of the exciter module. These temperature sensor modules obtain power based on their respective micro-energy harvesting chips and store it in the energy storage unit. The beam direction adjustment can be achieved based on the phased array antenna or other antenna array configured in the exciter module. The transmit power adjustment can be achieved based on the control circuit that realizes the output power adjustment.

[0077] The voltage recovery time data reflects the voltage recovery capability of the energy storage unit. When the voltage recovery time is too long, it indicates that the energy recovery of the corresponding temperature sensor module is too slow. This can lead to increased energy consumption of the energy storage unit by the power-consuming components during temperature measurement, potentially extending the interval between two consecutive temperature measurements or even preventing further temperature measurement. The contact temperature detection result reflects the current temperature of the measured contact. If the current temperature is too high or rises rapidly, the temperature detection frequency needs to be increased to promptly detect when the contact has reached a dangerous temperature, allowing maintenance personnel or the grid automatic control system to respond in a timely manner. In this context, the temperature sensor module on the corresponding contact requires higher power supply support. If the energy storage unit cannot receive efficient power replenishment, it cannot provide energy for a higher temperature detection frequency. Both of these situations affect the operational stability of the temperature sensor assembly in the cabinet environment, causing the temperature measurement frequency to fall short of expectations, or even causing the temperature sensor module to fail due to insufficient energy.

[0078] Unlike traditional passive power supply applications, which are limited by the installation space available for temperature sensor modules by the moving and stationary contacts and the vibrations that inevitably occur during the operation of the switchgear, temperature measurement of power switchgear contacts relies on the miniaturization of temperature sensor modules. In passive power supply solutions, energy storage units should not be large in size or capacity (it is preferable to use small-sized, relatively large-capacity supercapacitors that are stable under vibration conditions).

[0079] In this solution, the control module receives the voltage recovery time data and the contact temperature detection results, identifies the target sensor module that needs priority power replenishment, and then acts on the exciter module with a first control command and / or a second control command to enhance the power replenishment intensity of the exciter module to the target sensor module. This aims to address the following issues:

[0080] When the temperature sensor module used in the switchgear cabinet is powered by passive micro-energy based on the exciter module, the complexity and variability of the electromagnetic environment inside the cabinet will lead to unstable power extraction by the micro-energy extraction chip. The electromagnetic waves generated by the exciter module will produce areas of strong and weak energy signals in the cabinet environment due to reflection and absorption. The operation of the switchgear will create electromagnetic transients in the cabinet environment, and electromagnetic fields will also be generated during stable operation outside the operation process. These factors can all interfere with the function of the exciter module for the temperature sensor module, leading to a decrease in the energy harvesting efficiency of the micro-energy extraction chip. When the module is used on the moving contact, because the moving contact has different positions in different states, the change of the moving contact position may also cause the temperature sensor module to be in the weak energy signal area or even the blind area, resulting in weakened or interrupted energy harvesting by the temperature sensor module. Therefore, although the use of the exciter module solves the problem of micro-energy source and solves the problem of micro-energy intermittency in the cabinet as a whole, the switch cabinet has the characteristic of many temperature measurement points. When wireless power is provided to these temperature measurement points, the energy received by the temperature sensor modules distributed in different positions in the cabinet is easily affected by the cabinet environment and exhibits unstable energy reception and random energy reception characteristics.

[0081] This solution is based on the intermittent measurement of contact temperature by the temperature sensor module. However, during the wake-up (temperature measurement) period of the temperature sensor module, especially during the transmission of wireless signals, it is in a state of instantaneous high power consumption. If the energy storage unit is not sufficiently charged when the next wake-up is performed, it will cause the voltage of the energy storage unit to collapse, resulting in temperature measurement failure. If the energy storage unit is not sufficiently charged before the temperature detection frequency is increased, the expected temperature detection frequency may not be achieved.

[0082] In this solution, the target sensor module with insufficient energy replenishment of the energy storage unit is detected based on the voltage recovery time data, and the subsequent high-power target sensor module is detected based on the contact temperature detection results. For these target sensor modules, the energy resource allocation is optimized by adjusting the beam direction and / or electromagnetic wave power, so as to avoid system reliability risks caused by insufficient energy of the temperature sensor module at the contact temperature detection point, and switch cabinet safety risks caused by untimely contact temperature measurement.

[0083] As those skilled in the art know, the electromagnetic energy density at the installation locations of each temperature sensor module, from the exciter module to the temperature sensor module, is affected by various factors such as distance, shielding degree, and multipath effect. When the power supply intensity of the target sensor module is increased, it will also affect the power supply of other sensor modules. In order to reduce the control difficulty of the exciter module and the adjustment frequency of the exciter module, it is preferable to arrange two or more exciter modules in the switch cabinet, with some exciter modules serving as backup modules. When the number of target sensor modules exceeds the set number, the backup modules are activated to reduce the impact of the action of a single exciter module on the overall power supply of the temperature sensor modules.

[0084] For each temperature sensor module, after installation in the cabinet, an independent ID information can be configured for each temperature sensor module to distinguish them. The temperature sensor module with independent ID information can be configured in the system by manual calibration or by estimating the azimuth information based on the different antenna signal strengths of the exciter and configuring it in the system. This allows the corresponding target sensor module to be enhanced and recharged by adjusting the beam direction azimuth angle under the action of the first control command. Under the action of enhancing and recharging the target sensor module based on the second control command, the micro-energy density of the installation position of each temperature sensor module can be improved as a whole.

[0085] In practical applications, the fundamental purpose of contact temperature measurement is to ensure the safety of the power system. Therefore, for the two types of target sensor modules that need priority power replenishment based on voltage recovery time data and contact temperature detection results, the preferred approach is to prioritize the power replenishment of the target sensor modules, determining the target sensor modules identified based on contact temperature detection results as high priority and the target sensor modules identified based on voltage recovery time data as low priority. This prioritizes the temperature sensor modules that require high-frequency temperature measurement and timely acquisition of abnormal contact temperatures to ensure the safety of the power system.

[0086] In practical applications, such as using temperature data aggregation terminals to statistically analyze contact temperature measurement results for analyzing the changing patterns of contact states of each contact, the temperature data aggregation terminal can either retrieve the contact temperature detection results from the control module, or the control module can retrieve the contact temperature detection results from the temperature data aggregation terminal after the contact temperature detection results are sent to the temperature data aggregation terminal.

[0087] Example 2:

[0088] This embodiment is a further refinement of embodiment 1:

[0089] The identification method of the target sensor module is as follows:

[0090] If the voltage recovery time data of the temperature sensor module exceeds the preset time threshold configured for it, it is determined that the power acquisition is insufficient, and the temperature sensor module is identified as the target sensor module.

[0091] If the contact temperature detection result of the temperature sensor module exceeds the preset temperature threshold configured for it, it is determined that the subsequent temperature detection frequency of the sensor module needs to be increased, and the temperature sensor module is identified as the target sensor module.

[0092] For temperature sensor modules whose contact temperature detection results exceed the preset temperature threshold, the temperature detection frequency is increased in subsequent temperature detection processes.

[0093] In the above scheme, the target sensor module with insufficient power acquisition is identified by comparing the voltage recovery time data with a preset duration threshold. Similarly, the target sensor module whose temperature detection frequency needs to be increased is identified by comparing the contact temperature detection result with a preset temperature threshold. This target sensor module determination logic is simple and can be implemented by embedding a simple logic circuit within the temperature sensor module. It reduces the wireless signal transmission frequency of the temperature sensor module to save energy. However, regarding the timeliness of power replenishment, if the time it takes for the energy storage unit to recover to a preset voltage after high-power discharge is used as the voltage recovery time data, the acquisition time of the voltage recovery time data is relatively long, which affects the duration of the energy replenishment window for the energy storage unit. If the control is inadequate, such as when the base temperature measurement frequency configured for the temperature sensor module is high, it is preferable to use the following judgment method based on a preset voltage growth threshold. Similarly, if the current temperature of the contact is lower than the preset temperature threshold, and the danger temperature set for the contact is higher than the preset temperature threshold (the preset temperature threshold serves as a warning temperature when the contact temperature is about to reach the danger temperature), since the difference between the current temperature and the preset temperature threshold and the danger temperature of the contact is greater, using the current temperature of the contact exceeding the preset temperature threshold as the judgment condition for the target sensor module is also not conducive to the energy storage unit's energy replenishment window duration. If the temperature detection frequency increases significantly, it is preferable to use the following method based on a preset temperature growth threshold to determine the target sensor module.

[0094] In the above scheme, the temperature detection frequency of the corresponding temperature sensor module is increased based on the judgment result of the preset temperature threshold. The aim is to shorten the interval between two adjacent contact temperature measurements, so as to enhance temperature monitoring by increasing the detection frequency.

[0095] Example 3:

[0096] This embodiment is a further refinement of embodiment 1:

[0097] The identification method of the target sensor module is as follows:

[0098] If the voltage recovery time data of the temperature sensor module is lower than the preset voltage growth threshold configured for it, it is determined that the power acquisition is insufficient, and the temperature sensor module is identified as the target sensor module.

[0099] If the contact temperature detection result of the temperature sensor module exceeds the preset temperature increase threshold configured for it, it is determined that the subsequent temperature detection frequency of the sensor module needs to be increased, and the temperature sensor module is identified as the target sensor module.

[0100] For temperature sensor modules whose contact temperature detection results exceed the preset temperature threshold, the temperature detection frequency is increased in subsequent temperature detection processes.

[0101] As described above, using preset voltage growth thresholds and preset temperature growth thresholds as the criteria for determining the target sensor module is one approach: by monitoring voltage and temperature at least twice consecutively, the voltage recovery status and contact temperature growth status of the energy storage unit can be determined based on the voltage and temperature detection results obtained at different time points. When the voltage recovery rate is lower than the target threshold and the contact temperature growth rate exceeds the safety threshold, it is considered that the energy storage unit is insufficiently recharged or that the temperature sensor module is about to conduct higher frequency temperature measurements. Under this target sensor module identification method, the target sensor module can be identified more quickly, thus providing a longer recharge window for the energy storage unit of the target sensor module.

[0102] Example 4:

[0103] This embodiment is a further refinement of embodiment 1:

[0104] The target sensor modules identified based on the power acquisition situation are classified as the first target sensor modules, and the target sensor modules identified based on the contact temperature detection results are classified as the second target sensor modules.

[0105] During the process of enhancing the power supply intensity of the exciter module to the target sensor module, the power supply priority of the second target sensor module is higher than that of the first target sensor module.

[0106] The above solution involves classifying the energy replenishment priorities of target sensor modules and assigning higher energy replenishment priorities to temperature sensor modules that detect potential overheating of contacts. By increasing the temperature acquisition frequency of dangerous contacts, a more reliable guarantee is provided for the safety of switchgear equipment.

[0107] Example 5:

[0108] This embodiment is a further refinement of embodiment 1:

[0109] The temperature sensor module sends the voltage recovery time data and contact temperature detection results to the control module through its built-in wireless communication unit;

[0110] Each temperature sensor module has a built-in wireless communication unit, which includes a first wireless communication unit and a second wireless communication unit.

[0111] The first wireless communication unit is configured such that its signal is shielded inside the switch cabinet and received by a data collector installed inside the switch cabinet. The data collector relays the data to the control module outside the switch cabinet via a wired communication interface.

[0112] The second wireless communication unit is configured such that its signal is able to pass through the switch cabinet and be directly received by a control module located outside the switch cabinet.

[0113] In the above scheme, a wireless communication unit is used to establish a data connection between the temperature sensor module and the control module. This aims to achieve a wireless and passive connection for the temperature sensor module. The wireless communication unit is configured to include a first wireless communication unit and a second wireless communication unit. This provides a technical solution that uses different signal frequencies to give the wireless communication units redundant communication capabilities, ensuring a reliable signal connection between the temperature sensor module and the control module. Specifically, for the first wireless communication unit, its communication channel with the control module is as follows: the first wireless communication unit and the data acquisition unit transmit data wirelessly, and further, through wired communication, a wired relay method is used to establish a signal connection between the data acquisition unit and the control module. This communication channel aims to utilize the shielding effect of the switch cabinet's metal enclosure on the wireless signal to ensure communication quality with the data acquisition unit, and further utilizes the anti-interference characteristics of the wired relay itself to ensure communication quality with the control module. For the second wireless communication unit, the second wireless communication unit directly communicates wirelessly with the control module. In practical applications, it serves as a backup communication channel after the communication channel of the first wireless communication unit fails, ensuring basic data transmission capabilities.

[0114] Example 6:

[0115] This embodiment is a further refinement of embodiment 5:

[0116] The first wireless communication unit is configured as the default communication unit on the wireless communication unit and is used to transmit the voltage recovery time data and the contact temperature detection result;

[0117] The control module is configured to: when a fault is detected in the communication path through the first wireless communication unit and / or the data collector, activate the second wireless communication unit as an emergency communication unit and use it to transmit the voltage recovery time data and the contact temperature detection results.

[0118] The above scheme is a specific communication strategy for the first and second wireless communication units. The default communication unit is the regular communication unit, and the emergency communication unit is the backup communication unit. The first wireless communication unit is configured so that its signal is shielded within the switch cabinet, while the second wireless communication unit is configured so that its signal can pass through the switch cabinet. This indicates that the signal frequency of the first wireless communication unit is higher than that of the second wireless communication unit, such as using 2.4GHz and 433MHz signals respectively. The reason for using the first wireless communication unit as the default communication unit is that, on the one hand, when there are many temperature measurement points in the cabinet (such as a design that supports up to 200 temperature measurement points for data access), the data collector actively and in turn queries the sensor module on each contact. Since the complete data request-response cycle can be completed within milliseconds, this polling mechanism and communication delay can effectively avoid data packet collisions caused by multiple sensor modules sending data simultaneously. That is, the star network formed by the first wireless communication unit and the data collector in the cabinet... This approach avoids wireless signal conflicts between multiple temperature sensor modules, ensuring real-time and reliable data transmission. Furthermore, the use of external wired relay signals prevents interference from voltage recovery time data and contact temperature detection results to the external communication environment. The shielding of the cabinet and the anti-interference capabilities of the wired data relay also prevent external signals from interfering with the control module's received signals. Using the second wireless communication unit as a backup utilizes its ability to directly penetrate the cabinet, forming an emergency communication unit and establishing redundant communication channels when the default communication unit fails. This ensures the control module has basic data acquisition capabilities and avoids the risks associated with using the second wireless communication unit as a regular communication unit, where data (including data from temperature sensor modules and other sources in the environment) is prone to collisions during transmission, leading to data loss or high latency, especially when there are many temperature measurement points. This reduces the demands on the system's data transmission processing mechanism.

[0119] Example 7:

[0120] This embodiment is a further refinement of embodiment 5:

[0121] The data acquisition unit is configured to communicate with each temperature sensor module in a polling manner via the first wireless communication unit;

[0122] When the temperature sensor module detects that the contact temperature exceeds a preset temperature threshold or a preset temperature increase threshold, the temperature sensor module actively sends the contact temperature detection result to the control module through the first wireless communication unit and / or the second wireless communication unit.

[0123] In the above scheme, for the star-shaped communication network established between the first wireless communication unit and the data acquisition unit in each temperature sensor module, an active and orderly data channel is established in a polling manner. This aims to avoid signal conflicts between data from different temperature sensor modules and ensure the real-time acquisition of data from the temperature sensor modules. The above active transmission of contact temperature detection results is as follows: when the contact temperature is determined to be abnormal based on the comparison result between the contact temperature detection result and the preset temperature threshold or the preset temperature increase threshold, in order to improve the guarantee capability for the safe operation of the switchgear, an emergency communication mechanism is triggered to report the contact temperature detection result in a timely manner.

[0124] Example 8:

[0125] This embodiment is a further refinement of embodiment 6:

[0126] The temperature sensor module is configured such that when the communication path between the first wireless communication unit and the data collector is normal, the second wireless communication unit is in a sleep state.

[0127] The control module is configured to send a wake-up signal to the faulty temperature sensor module when the fault is detected. The temperature sensor module is configured to wake up its second wireless communication unit after receiving the wake-up signal to send voltage recovery time data and contact temperature detection results.

[0128] The above scheme provides a specific working and sleep mechanism for the wireless communication unit, which aims to reduce unnecessary power consumption of the wireless communication unit so as to ensure that the temperature sensor module can work stably for a long time under the micro-energy power draw from the electromagnetic waves emitted by the exciter module. In specific applications, the second wireless communication unit is set to wake up based on a wake-up circuit with relatively low sleep power consumption.

[0129] Example 9:

[0130] This embodiment is a further refinement of embodiment 5:

[0131] The first wireless communication unit of the temperature sensor module is configured to include a sleep state and a working state. The first wireless communication unit is configured to switch between the sleep state and the working state within a preset time window, or to switch from the sleep state to the working state after receiving a wake-up command from the collector.

[0132] The temperature sensor module is configured to dynamically adjust the time window according to the instructions issued by the control module to the temperature sensor module.

[0133] In the above scheme, the sleep and working states configured for the first wireless communication unit are designed to manage the power consumption of the first wireless communication unit and provide a management strategy based on time windows and wake-up commands to ensure that the temperature sensor module is in a low-power state during non-working hours. The dynamic adjustment of the time window means that the control module can dynamically adjust the working strategy of the temperature sensor module via commands when an abnormal contact temperature is detected, based on the contact temperature detection results, thereby adjusting the sleep and working states to meet emergency temperature measurement needs.

[0134] Example 10:

[0135] Based on Example 1, this embodiment provides a power switch cabinet contact temperature measurement system based on micro-energy extraction. This system is used to implement the method described in Example 1.

[0136] As those skilled in the art will recognize, this embodiment is a system for implementing the method, which includes not only the hardware necessary for implementing the method, but also the software for implementing the method logic.

[0137] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for temperature measurement of power switchgear contacts based on low-energy power extraction, wherein the method uses electromagnetic waves generated by an exciter module to wirelessly power a temperature sensor module installed on the switchgear contacts, the temperature sensor module being used for measuring the temperature of the switchgear contacts, characterized in that... In this method, the exciter module supplies power to multiple temperature sensor modules, and the beam direction and / or transmission power of the electromagnetic waves generated by the exciter module are adjustable. The temperature sensor module obtains electrical energy based on the electromagnetic waves and stores the electrical energy through the energy storage unit. During operation, it uploads the voltage recovery time data of the energy storage unit and the collected contact temperature detection results to the control module. The control module receives the voltage recovery time data and the contact temperature detection result, and determines the power acquisition status of each sensor module based on the voltage recovery time data, determines the subsequent temperature detection frequency of each sensor module based on the contact temperature detection result, and identifies the target sensor module that needs to be prioritized for power replenishment based on the power acquisition status and temperature detection frequency. The exciter module performs any of the following actions on the target sensor module: Based on the orientation of the target sensor module, the control module sends a first control command to the exciter module. The first control command is used to adjust the beam direction of the electromagnetic waves emitted by the exciter module in order to enhance the power supply intensity of the exciter module to the target sensor module. The control module sends a second control command to the exciter module. The second control command is used to increase the power of the electromagnetic waves emitted by the exciter module, so as to enhance the power supply intensity of the exciter module to the target sensor module. The target sensor modules identified based on the power acquisition situation are classified as the first target sensor modules, and the target sensor modules identified based on the contact temperature detection results are classified as the second target sensor modules. During the process of enhancing the power supply intensity of the exciter module to the target sensor module, the power supply priority of the second target sensor module is higher than that of the first target sensor module. The temperature sensor module sends the voltage recovery time data and contact temperature detection results to the control module through its built-in wireless communication unit; Each temperature sensor module has a built-in wireless communication unit, which includes a first wireless communication unit and a second wireless communication unit. The first wireless communication unit is configured such that its signal is shielded inside the switch cabinet and received by a data collector installed inside the switch cabinet. The data collector relays the data to the control module outside the switch cabinet via a wired communication interface. The second wireless communication unit is configured such that its signal is configured to pass through the switch cabinet and be directly received by a control module located outside the switch cabinet. Two or more actuator modules are arranged in the switch cabinet, with some actuator modules serving as backup modules. The backup modules are activated when the number of target sensor modules exceeds the set number.

2. The method for measuring the temperature of contacts in a power switchgear based on micro-energy extraction according to claim 1, characterized in that, The identification method of the target sensor module is as follows: If the voltage recovery time data of the temperature sensor module exceeds the preset time threshold configured for it, it is determined that the power acquisition is insufficient, and the temperature sensor module is identified as the target sensor module. If the contact temperature detection result of the temperature sensor module exceeds the preset temperature threshold configured for it, it is determined that the subsequent temperature detection frequency of the sensor module needs to be increased, and the temperature sensor module is identified as the target sensor module. For temperature sensor modules whose contact temperature detection results exceed the preset temperature threshold, the temperature detection frequency is increased in subsequent temperature detection processes.

3. The method for measuring the temperature of contacts in a power switchgear based on micro-energy extraction according to claim 1, characterized in that, The identification method of the target sensor module is as follows: If the voltage recovery time data of the temperature sensor module is lower than the preset voltage growth threshold configured for it, it is determined that the power acquisition is insufficient, and the temperature sensor module is identified as the target sensor module. If the contact temperature detection result of the temperature sensor module exceeds the preset temperature increase threshold configured for it, it is determined that the subsequent temperature detection frequency of the sensor module needs to be increased, and the temperature sensor module is identified as the target sensor module. For temperature sensor modules whose contact temperature detection results exceed the preset temperature threshold, the temperature detection frequency is increased in subsequent temperature detection processes.

4. The method for measuring the temperature of contacts in a power switchgear based on micro-energy extraction according to claim 1, characterized in that, The first wireless communication unit is configured as the default communication unit on the wireless communication unit and is used to transmit the voltage recovery time data and the contact temperature detection result; The control module is configured to: when a fault is detected in the communication path through the first wireless communication unit and / or the data collector, activate the second wireless communication unit as an emergency communication unit and use it to transmit the voltage recovery time data and the contact temperature detection results.

5. The method for measuring the temperature of contacts in a power switchgear based on micro-energy extraction according to claim 1 or 4, characterized in that, The data acquisition unit is configured to communicate with each temperature sensor module in a polling manner via the first wireless communication unit; When the temperature sensor module detects that the contact temperature exceeds a preset temperature threshold or a preset temperature increase threshold, the temperature sensor module actively sends the contact temperature detection result to the control module through the first wireless communication unit and / or the second wireless communication unit.

6. The method for measuring the temperature of contacts in a power switchgear based on micro-energy extraction according to claim 4, characterized in that, The temperature sensor module is configured such that when the communication path between the first wireless communication unit and the data collector is normal, the second wireless communication unit is in a sleep state. The control module is configured to send a wake-up signal to the faulty temperature sensor module when the fault is detected. The temperature sensor module is configured to wake up its second wireless communication unit after receiving the wake-up signal to send voltage recovery time data and contact temperature detection results.

7. The method for measuring the temperature of contacts in a power switchgear based on micro-energy extraction according to claim 1, characterized in that, The first wireless communication unit of the temperature sensor module is configured to include a sleep state and a working state. The first wireless communication unit is configured to switch between the sleep state and the working state within a preset time window, or to switch from the sleep state to the working state after receiving a wake-up command from the collector. The temperature sensor module is configured to dynamically adjust the time window according to the instructions issued by the control module to the temperature sensor module.

8. A power switchgear contact temperature measurement system based on micro-energy extraction, characterized in that, The system is used to implement the method described in any one of claims 1 to 7.

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