CN115459448A - Switch cabinet latent fault diagnosis early warning detection system and method - Google Patents

Abstract

The invention belongs to the technical field of switch cabinet fault diagnosis, and discloses a latent fault diagnosis and early warning detection system and method of a switch cabinet, including a cabinet body and a main control unit, an auxiliary unit, a receiving unit, a detection unit, and a peripheral device respectively installed in the cabinet body. unit; the present invention can detect the temperature and humidity in the switch cabinet and the content of the main degraded gas and decomposition products produced by the joints in the cabinet due to high temperature, and automatically analyze the detected data, and output the evaluation of the internal insulation performance of the switch cabinet, so as to characterize the switch In the operating state of the cabinet, if it is detected that the degraded gas exceeds the safety threshold, an alarm will be issued to remind the on-site staff to deal with it in time, effectively solving the problem that the closed high-voltage cabinet cannot be opened for detection during operation, and the problem of heating defects cannot be found through normal monitoring methods, avoiding switching Condensation occurs in the cabinet, real-time safety monitoring of the switch cabinet is realized, the difficulty of inspection work by operation and maintenance personnel is reduced, and the safety risk of inspection work by operation and maintenance personnel is reduced.

Description

A switchgear latent fault diagnosis and early warning detection system and method

technical field

The invention belongs to the technical field of switch cabinet fault diagnosis, and in particular relates to a latent fault diagnosis and early warning detection system and method of a switch cabinet.

Background technique

The switchgear is one of the key main equipment of the power system, and its operating status has a great influence on the reliability of the power system. Enclosed switchgear is widely used in switching stations, community power distribution rooms and substations due to its advantages of safety, reliability, compact structure, small footprint, and convenient operation. The closed high-voltage cabinet cannot be opened during operation, so the actual temperature of the joints in the cabinet cannot be measured during operation. Heating accidents of joints in switch cabinets (especially when the load is heavy) have an increasing trend in recent years, and have become a problem that seriously affects safety production.

The primary equipment of the closed switchgear is distributed in three mutually independent compartments, namely the switch room, the busbar room and the outlet room. According to the requirements of relevant regulations, all compartments are in a closed state except that holes must be opened on the partition to realize electrical connection, control and ventilation. There are generally 6 main plugs on the main switch in the switch room, and 18 connection points through which the load current flows; in the outlet room, there are 3 main connectors connected to the outgoing cables and more than a dozen contacts connected to the bypass switch. The above-mentioned connection points directly flow through the load current, and when the load is large, the connection points with hidden dangers will generate heat. Since the heating point is in the sealed cabinet, the door of the cabinet during operation is forbidden to be opened, and the personnel on duty cannot find the heating defect through normal monitoring methods. When the heat is severe, the connector will turn red or even fuse, which will directly cause production accidents. If a sudden power outage is caused, it will not only cause adverse social impacts, but also cause great economic losses to the power supply department. Judging from the current equipment status of the sealed high-voltage switchgear, it is unrealistic to completely avoid joint heating failures. Moreover, when condensation occurs in the switchgear, the insulation performance of each equipment room in the cabinet will decrease in the short term, which will easily lead to creepage accidents, corrode the electrical equipment in the cabinet for a long time, and promote the further decline of the insulation capacity of the equipment, thus causing voltage flashover Accidents will affect the normal operation of the switchgear, so there is an urgent need for a latent fault diagnosis and early warning detection device for the switchgear in order to take measures to prevent vicious accidents.

Contents of the invention

The purpose of the present invention is to provide a switch cabinet latent fault diagnosis and early warning detection system and method, which realizes real-time monitoring of the switch cabinet, real-time diagnosis and early warning of the gas and temperature and humidity in the cabinet, and effectively prevents the joints in the cabinet from turning red when the heat is severe Even fusing, directly causing production accidents.

In order to achieve the above object, the present invention provides a latent fault diagnosis and early warning detection system for switchgear, including a cabinet body and a main control unit, an auxiliary unit, a receiving unit, a detection unit, and a peripheral unit respectively installed in the cabinet body; The control unit is used to receive and analyze data, and monitor the running state of the cabinet; the auxiliary control unit is used to receive collection information, operation instruction information and feedback execution instruction information; the receiving unit is used to collect information and complete data interaction; The detection unit is used to collect on-site information such as temperature, humidity, gas concentration, etc.; the peripheral unit is used to receive control instructions and perform corresponding operations.

As a further technical improvement, the main control unit includes a microprocessor; the receiving unit includes a communication module; the peripheral unit includes a display screen, a key array, a power module, a multiplex port and an alarm module, and the power module is connected to the The display screen, the key array, the power module, the multiplexing port, and the alarm module are electrically connected; the key array is electrically connected to the display screen, the microprocessor, and the alarm module respectively; the multiplexing port is electrically connected to the microprocessor .

As a further technical improvement, the key array includes switch input and switch output; the switch input includes power off, measurement mode, and parameter initialization; the switch output includes component display, temperature and humidity display, and warning information .

As a further technical improvement, the detection unit includes an industrial collector, a filter amplifier circuit, a gas acquisition circuit, and a temperature and humidity sensor; the gas acquisition circuit and the temperature and humidity sensor are respectively electrically connected to the filter amplifier circuit; the industrial collector and The filter amplifier circuit is electrically connected.

As a further technical improvement, the gas collection circuit is provided with a probe module; the probe module includes a carbon monoxide sensor, a nitrogen dioxide sensor and an ozone sensor.

Specifically, the cabinet body is made of POM engineering plastics, and the interior of the cabinet body adopts a four-layer board separation structure to accommodate hardware equipment. The display adopts LCD display.

As a further technical improvement, the alarm module includes a buzzer and a warning light.

As a further technical improvement, the cabinet is equipped with a temperature-regulating dehumidification device; the temperature-regulating dehumidification device is electrically connected to the microprocessor through a relay.

On the other hand, the present invention also provides a latent fault diagnosis and early warning detection method of a switchgear, which includes the following steps: S1, start collecting the information of the switchgear to be tested after parameter initialization; S2, collecting the temperature and humidity data in the switchgear by the temperature and humidity sensor After amplification and filtering and internal A/D conversion, the digital signal is transmitted to the microprocessor, and after analysis and processing, the temperature and humidity value is displayed on the display screen. If the temperature and humidity exceed the set threshold value, the microprocessor drives the relay to adjust the temperature and humidity. At the same time, the early warning information is prompted; S3. The electrochemical sensor collects the component concentration signal in the switch cabinet. After the collected signal is amplified and filtered, the analog voltage signal is compensated according to the temperature and humidity. After the calibration is completed, it is received by the industrial collector and displayed on the display. The gas composition information is displayed on the screen, and when the value exceeds the set threshold, the display screen turns into an early warning prompt window, prompting an early warning signal; S4, when the value exceeds the set threshold, it is an abnormal diagnosis, and the microprocessor immediately closes the gas concentration collection interface, And store the concentration information in the designated folder, return to the diagnosis interface, and pop up a warning to display the diagnosis result; S5, after the warning is over, you can adjust the relevant parameters in the key array to facilitate the subsequent detection of the device.

As a further technical improvement, in addition to automatically storing data when an alarm occurs, under normal conditions, the display shows the gas concentration collection interface. When the pause button in the button array is clicked, the collection will stop, and the collected data will be named after time. Save to a fixed folder; clicking the exit button will also stop collecting and storing data, and then return to the diagnosis interface.

As a further technical improvement, it also includes historical data query: click the historical data view button in the diagnostic interface, and the historical data will pop up. The above files are named in the format of collection time. Select one of them to open and you will see the history data.

Compared with the prior art, the present invention has the following beneficial technical effects:

The invention can detect the temperature and humidity in the switch cabinet and the content of the main degraded gas and decomposition products produced by the joints in the cabinet due to high temperature, automatically analyze the detected data, and output the evaluation of the internal insulation performance of the switch cabinet, so as to characterize the operation of the switch cabinet If it is detected that the degraded gas exceeds the safety threshold, an alarm will be issued to remind the on-site staff to deal with it in time, effectively solving the problem that the closed high-voltage cabinet cannot be opened for detection during operation, and the problem of heating defects cannot be found through normal monitoring methods, so as to avoid the occurrence of switch cabinets. Condensation phenomenon, realize real-time safety monitoring of switchgear, reduce the difficulty of inspection work of operation and maintenance personnel, and reduce the safety risk of operation and maintenance personnel inspection work.

Description of drawings

In order to illustrate the embodiments of the present invention more clearly, the accompanying drawings required for the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, Other drawings can be obtained based on this drawing without any creative effort.

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic structural diagram of the latent fault diagnosis and early warning detection system of the switchgear of the embodiment.

Fig. 3 is the temperature and humidity detection circuit diagram of the embodiment.

Fig. 4 is a schematic structural diagram of the probe module of the embodiment.

Fig. 5 is a flow chart of the software detection of the embodiment.

Fig. 6 is a flowchart of temperature and humidity signal detection in an embodiment.

Fig. 7 is a flow chart of data collection of the detection unit of the embodiment.

detailed description

Embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings.

Embodiments of the present disclosure are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Apparently, the described embodiments are only some of the embodiments of the present disclosure, not all of them. The present disclosure can also be implemented or applied through different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.

Example

As shown in Figure 1, this embodiment provides a latent fault diagnosis and early warning detection system for a switchgear, including a cabinet and a main control unit, an auxiliary unit, a receiving unit, a detection unit, and a peripheral unit respectively installed in the cabinet; The main control unit is used to receive and analyze data, and monitor the running state of the cabinet; the auxiliary control unit is used to receive collection information, operation instruction information and feedback execution instruction information; the receiving unit is used to collect information and complete data Interaction; the detection unit is used to collect on-site information such as temperature, humidity, gas concentration, etc.; the peripheral unit is used to receive control instructions and perform corresponding operations.

The main control unit includes a microprocessor; the receiving unit includes a communication module; the peripheral unit includes a display screen, a key array, a power supply module, a multiplexing port and an alarm module, and the power supply module is connected to the display screen and the key array respectively. , the power supply module, the multiplexing port, and the alarm module are electrically connected; the key array is electrically connected to the display screen, the microprocessor, and the alarm module; the multiplexing port is electrically connected to the microprocessor. Specifically, the display screen adopts an LCD display screen.

Specifically, the host computer software in this embodiment mainly includes a login interface, a parameter setting interface, a data display interface, and an early warning interface. For a single detection, first switch from the login interface to the main operation interface, after initializing the threshold parameters, the lower computer on the interface transmits data, displays the detection information on the visual interface, and compares it with the set threshold, if it exceeds the set threshold, it goes to the early warning interface and prompts The cabinet needs to be maintained manually, and if the reading is within the threshold range, the device operates normally. After the single detection is over, it can enter the continuous detection mode through key input. After the cabinet is replaced, it will run normally and detect the data information in the cabinet to be tested. The lower computer software mainly completes data collection, analysis, uploading and other functions. After the function of each module of the device is normal, the data collection starts. The lower computer drives the temperature and humidity sensor and the probe module to collect the temperature, humidity and concentration in the cabinet to be tested, and displays them on the LCD screen and UI interface respectively. If the displayed value exceeds the initial set threshold Drive the buzzer to alert relevant personnel for maintenance, and at the same time upload the data to the host computer, interact with the information of the host computer, receive operation information such as parameter settings and early warning information, and feed it back to the module for execution to complete the corresponding operation.

Specifically, the gas acquisition circuit collects the component information in the cabinet to be tested, the analog voltage indicates the concentration of the gas component, and the voltage fluctuation indicates the change trend of the gas component; the noise is filtered out by the filter amplifier circuit and its voltage amplitude is increased to distinguish Effective information and interference signals. The industrial collector receives data information, receives component types and concentrations in multiple channels and dimensions, converts data formats, and transmits data in real time; the microprocessor uniformly receives various data and feeds back on-site operation instruction information.

The button array includes switch input and switch output; the switch input includes power off, measurement mode, and parameter initialization; the switch output includes component display, temperature and humidity display, and early warning information.

The detection unit includes an industrial collector, a filter amplifier circuit, a gas acquisition circuit, and a temperature and humidity sensor; the gas acquisition circuit and the temperature and humidity sensor are respectively electrically connected to the filter amplifier circuit; the industrial collector is electrically connected to the filter amplifier circuit connect.

Specifically, the temperature and humidity sensor adopts an integrated DHT11 digital temperature and humidity sensor, which has a built-in dedicated digital acquisition module and a temperature and humidity sensor module, which can be integrated to achieve the purpose of measurement, with fast response speed and strong anti-interference ability during on-site detection. , Accurate and effective detection of temperature and humidity information, with high reliability and excellent stability during long-term work.

Specifically, during on-site inspection, the DHT11 sensor collects the temperature and humidity information in the cabinet to be tested, and after correction according to the calibration coefficient, it is amplified, mode converted, and transmitted to the microprocessor through the serial port, and the measurement results are displayed intuitively on the LCD display. As shown in Figure 3, pin 2 of the DHT11 temperature and humidity sensor is connected to the data transmission port of the microprocessor. Since the on-site measurement circuit is less than 20 meters, a 5k resistor needs to be connected between pin 2 of the sensor and the power supply. The power port of the sensor Pin 1 and pin 4 are suspended in the power supply module, and pin 3 is suspended.

Specifically, when the temperature and humidity in the cabinet exceed the set threshold, the LCD screen will flash to indicate the warning information, and the buzzer will vibrate and sound to remind the on-site personnel that the temperature and humidity in the cabinet are too high, and the microprocessor drives the relay through the triode to start cooling down. Humidity, when the temperature and humidity in the cabinet drop to the initialization state, the relay will stop after power failure, effectively preventing condensation in the cabinet to be tested.

The gas collection circuit is provided with a probe module; the probe module includes a carbon monoxide sensor, a nitrogen dioxide sensor and an ozone sensor.

Specifically, the purpose of using multiple electrochemical sensors built into the probe module in this embodiment is that when partial discharge occurs in the air in the cabinet, decomposition products such as O ₃ , NO, NO ₂ , N ₂ O ₅ are mainly produced, and the solid insulating material is damaged. CO, CO ₂ and other gases are produced, but the decomposition components such as NO and N ₂ O ₅ are intermediate products of the reaction, and the volume fraction of CO ₂ is too large, so it cannot be used as a characteristic component for partial discharge detection. CO and NO ₂ can exist stably in the air and are closely related to the characteristics of partial discharge, which can be used as the main characteristic components for detecting partial discharge.

Specifically, the probe module has built-in multiple electrochemical sensors, including carbon monoxide sensors, nitrogen dioxide sensors and ozone sensors, and outputs original analog voltage signals. The electrochemical sensors have high sensitivity and resolution, and strong anti-interference ability. The temperature range is -30°C-+80°C, the working humidity range is 15%~95%RH, and the measurement range is 0-1000ppm, among which the detection resolution of CO, NO ₂ , O ₃ is better than 0.05ppm, and the response The time is better than 10s, the pump suction sampling method (flow rate is better than 1L/min), the concentration range of _CO is about 0-60ppm, the range of NO2 concentration is about 0-40ppm, and the range of _O3 concentration is about 0-20ppm, which meets the requirements of gas range detection range, its detection accuracy can reach the decimal level, when the gas diffuses to the electrolytic cell, it can react within 5 seconds to convert the gas concentration into potential information, and the electrochemical sensor has the characteristics of low price and simple operation, so this The project chooses this module as the detection unit.

Specifically, as shown in Table 1 are the main performance parameters of this embodiment, the external power supply of this embodiment is 220V, the internal power supply is 5V, 3.3V, the temperature and humidity monitoring is converted into digital signal transmission, received and displayed by the micro-processing, and the gas composition is converted For analog signal transmission, it is received by the industrial collector (received and displayed by the microprocessor through the protocol conversion port during single-component detection) and displayed on the host computer interface.

Table 1. Main parameters

The test shows that the system can achieve the expected goal, and can effectively detect temperature, humidity, and gas composition information. The temperature measurement accuracy can reach ± ₁ °C, and the humidity measurement accuracy can reach ± ₁ %RH. A component gas with a measured concentration up to 1 ppm.

Specifically, during the on-site test, the electrochemical sensor uses the principle of the electrolytic cell to convert the concentration of the gas component to be measured into an electrical signal, and the original voltage signal is modified by combining the temperature and humidity calibration coefficient, and then amplified and filtered, and received by the industrial collector; at the same time, the probe module has a built-in The AD conversion circuit can output digital signals, and the external protocol conversion module is uniformly received by the microprocessor. As shown in Figure 4, when the single probe module is working, pins 1 and 2 are used as power supply inputs to connect to pins 1 and 2 of the acquisition terminal, analog output port 3 is connected to pin 3 of the collector, and the output voltage of the serial port is respectively connected to the protocol conversion Terminal pins 4 and 5 realize the multi-terminal display of the collection components.

Specifically, as shown in Figure 6, the temperature and humidity information detection process is shown in the figure. After the initialization is completed, the cabinet information to be tested begins to be collected: the temperature and humidity collection uses a temperature and humidity sensor, and the collected signal is calibrated according to the correction coefficient and then amplified. After filtering and internal A/D conversion, the digital signal is transmitted to the microprocessor, and the temperature and humidity value is displayed on the LCD after analysis and processing. If the temperature and humidity exceed the set threshold, the microprocessor drives the relay to adjust the temperature and humidity, and prompts at the same time Pre-warning information; the component concentration uses an electrochemical sensor. After the collected signal is amplified and filtered, the analog voltage signal is compensated according to the temperature and humidity. After the calibration is completed, it is received by the industrial collector and the gas component information is displayed on the operation interface. When the value exceeds When setting the threshold, enter the warning prompt window to prompt the warning signal. After the warning is over, you can adjust the relevant parameters in the operating system or the key input module to facilitate subsequent detection of the device.

Specifically, the cabinet body is made of POM engineering plastics, and the interior of the cabinet body adopts a four-layer board separation structure to accommodate hardware equipment.

The alarm module includes a buzzer and a prompt light.

The cabinet body is equipped with a temperature-regulating dehumidification device; the temperature-regulating dehumidification device is electrically connected to the microprocessor through a relay.

This embodiment also provides a latent fault diagnosis and early warning detection method for a switchgear, including the following steps: S1, start to collect the switchgear information to be tested after parameter initialization; S2, the temperature and humidity sensor collects the temperature and humidity data in the switchgear after amplification After filtering and internal A/D conversion, the digital signal is transmitted to the microprocessor, and after analysis and processing, the temperature and humidity value is displayed on the display screen. If the temperature and humidity exceed the set threshold, the microprocessor drives the relay to adjust the temperature and humidity, and prompts at the same time Early warning information; S3. The electrochemical sensor collects the component concentration signal in the switch cabinet. After the collected signal is amplified and filtered, the analog voltage signal is compensated according to the temperature and humidity. After the calibration is completed, it is received by the industrial collector and displayed on the display. For gas composition information, when the value exceeds the set threshold, the display screen turns into an early warning prompt window, prompting the early warning signal; S4, when the value exceeds the set threshold, it is an abnormal diagnosis, and the microprocessor immediately closes the gas concentration collection interface, and puts the The concentration information is stored in the designated folder, returns to the diagnosis interface, and a warning pops up to display the diagnosis result; S5. After the warning is over, the relevant parameters can be adjusted in the key array to facilitate subsequent detection of the device.

In addition to automatically storing data when an alarm occurs, under normal conditions, the display shows the gas concentration collection interface. When the pause button in the button array is clicked, the collection will stop, and the collected data will be named after time and stored in a fixed folder. ;Clicking the Exit button will also stop collecting and storing data, and then return to the diagnosis interface.

It also includes historical data query: click the historical data view button in the diagnostic interface, and the historical data will pop up. The above files are named in the format of collection time. Select one of them to open and you will see the historical data.

As shown in Figure 5, the software of the switch cabinet latent fault diagnosis and early warning detection system based on the embedded operating system in this embodiment mainly completes functions such as signal collection, early warning prompts, key input, output display, etc., first key input initializes hardware execution functions and software operation functions, initialize hardware parameters and software task flow, collect data information such as temperature, humidity, and component concentration in the cabinet after each module runs smoothly, and display the information in numerical form on the interactive interface for easy observation. When the number exceeds the set threshold, the alarm prompts the relevant personnel to overhaul, so as to avoid the failure of the switchgear caused by condensation and partial discharge.

Specifically, detect the gas concentration in the switch cabinet in real time: after the hardware startup is complete, run the check.m file to enter the login interface, confirm the user identity and go to the diagnosis interface, click the real-time concentration check button to go to the gas concentration collection interface, Click the start button to start collecting gas concentration data in real time.

Specifically, as shown in Figure 7, when the data acquisition of the detection unit detects the potential change of the input port, it starts to receive signals at high speed: the industrial collector receives gas composition information at high speed in multiple channels and collects analog signals; the microprocessor receives temperature and humidity at high speed information, collect digital signals, and compare data formats to judge data accuracy. After the data verification is completed, a data stream is formed and imported into the buffer. After receiving the transmission command, the data information is packaged and transmitted to the control module. The operation command information is received and the execution command information is fed back to complete the data information interaction. At the same time, the visualization The analysis results are displayed on the interface. After the detection is completed, the control module can issue a parameter adjustment command to adjust the initialization parameters of the device to facilitate subsequent detection.

The fault diagnosis function of the latent fault diagnosis and early warning detection system of the switchgear in this embodiment includes two parts, the first is the fault diagnosis of the latest historical data, and the other is the fault diagnosis during real-time monitoring. Click the fault diagnosis button on the diagnosis interface to diagnose the latest gas concentration data. On the gas concentration collection interface, click the start button to start data collection and diagnose at the same time. The diagnosis model is the same as above. When an abnormality is diagnosed, the gas concentration acquisition interface will be closed immediately, and the concentration information will be stored in the designated folder, and the diagnosis interface will be returned to, and a warning will pop up. The diagnostic results will be displayed on the diagnostic interface to realize real-time monitoring of the abnormal state inside the switchgear.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

Claims (10)

1. A switch cabinet latent fault diagnosis early warning detection system is characterized by comprising a cabinet body, a main control unit, an auxiliary unit, a receiving unit, a detection unit and a peripheral unit, wherein the main control unit, the auxiliary unit, the receiving unit, the detection unit and the peripheral unit are respectively arranged in the cabinet body;

the main control unit is used for receiving and analyzing data and monitoring the running state of the cabinet body;

the auxiliary control unit is used for receiving the acquisition information and the operation instruction information and feeding back the execution instruction information;

the receiving unit is used for collecting information and finishing data interaction;

the detection unit is used for acquiring field information;

the peripheral unit is used for receiving the control instruction and executing corresponding operation.

2. The switch cabinet latent fault diagnosis, early warning and detection system of claim 1, wherein the master control unit comprises a microprocessor; the receiving unit comprises a communication module; the peripheral unit comprises a display screen, a key array, a power supply module, a multiplexing port and an alarm module, wherein the power supply module is electrically connected with the display screen, the key array, the power supply module, the multiplexing port and the alarm module respectively; the key array is electrically connected with the display screen, the microprocessor and the alarm module respectively; the multiplexing port is electrically connected with the microprocessor.

3. The switch cabinet latent fault diagnosis and early warning detection system of claim 2, wherein the key array comprises a switching value input and a switching value output; the switching value input comprises power supply turn-off, a measurement mode and parameter initialization; the switching value output comprises component display, temperature and humidity display and early warning information.

4. The switch cabinet latent fault diagnosis, early warning and detection system according to claim 1, wherein the detection unit comprises an industrial collector, a filtering and amplifying circuit, a gas collecting circuit and a temperature and humidity sensor; the gas acquisition circuit and the temperature and humidity sensor are respectively electrically connected with the filtering and amplifying circuit; and the industrial collector is electrically connected with the filtering and amplifying circuit.

5. The switch cabinet latent fault diagnosis, early warning and detection system according to claim 4, wherein the gas collection circuit is provided with a probe module; the probe module comprises a carbon monoxide sensor, a nitrogen dioxide sensor and an ozone sensor.

6. The switch cabinet latent fault diagnosis, early warning and detection system of claim 2, wherein the alarm module comprises a buzzer and a warning light.

7. The latent fault diagnosis, early warning and detection system of switch cabinet according to claim 2, wherein the cabinet body is provided with a temperature-adjusting dehumidifying device; the temperature adjusting and dehumidifying device is electrically connected with the microprocessor through a relay.

8. A switch cabinet latent fault diagnosis early warning detection method is characterized by comprising the following steps; s1, starting to acquire information of a switch cabinet to be detected after parameter initialization; s2, collecting temperature and humidity data in a switch cabinet by a temperature and humidity sensor, amplifying, filtering and carrying out internal A/D conversion, transmitting a digital signal to a microprocessor, analyzing and processing the digital signal, displaying a temperature and humidity numerical value on a display screen, and if the temperature and humidity exceed a set threshold value, driving a relay by the microprocessor to adjust the temperature and humidity and simultaneously prompting early warning information;

s3, an electrochemical sensor collects component concentration signals in a switch cabinet, the collected signals are amplified and filtered, then analog voltage signals are compensated according to temperature and humidity, the analog voltage signals are received by an industrial collector after calibration is completed, gas component information is displayed on a display screen, and when the value exceeds a set threshold value, the display screen is switched into an early warning prompt window to prompt early warning signals;

s4, when the value exceeds a set threshold value, the abnormality is diagnosed, the microprocessor immediately closes the gas concentration acquisition interface, stores the concentration information into a designated folder, returns to the diagnosis interface, and pops up a warning to display a diagnosed result;

and S5, after the early warning is finished, relevant parameters can be adjusted in the key array, and the subsequent detection of the device is facilitated.

9. The latent fault diagnosis, early warning and detection method of the switch cabinet according to claim 8, characterized in that in addition to automatically storing data during alarming, in a normal state, a display screen displays a gas concentration acquisition interface, and when a pause button in a key array is clicked, the acquisition is stopped, and the acquired data is named by time and stored in a fixed folder; clicking the exit button will also stop collecting and storing data and then return to the diagnostic interface.

10. The switch cabinet latent fault diagnosis and early warning detection method according to claim 8, further comprising historical data query: clicking the historical data view button in the diagnostic interface pops up the historical data, the files above are all named in the collection time format, and selecting one of the open will see the historical data therein.

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