Pyrolysis particle sensor-based switch cabinet fire early warning device and method

Abstract

The invention discloses a switch cabinet fire early warning device and method based on a pyrolysis particle sensor, and belongs to the field of substation fire early warning. The switch cabinet fire early warning device comprises a monitoring host, a pyrolysis particle and characteristic gas monitoring module, an environment monitoring module and an air exhaust module; the pyrolysis particle and characteristic gas monitoring module and the environment monitoring module are electrically connected with the monitoring host respectively; the exhaust module comprises a gas conduit, a controllable one-way gas valve and a gas collecting pipe; the gas conduit is connected to a sealing flange on the back surface of the switch cabinet; a hole is formed in the back of the switch cabinet and close to the top of the cable chamber, a sealing flange is installed, and a gas conduit penetrates through the sealing flange and is connected with the cable chamber space of the switch cabinet; a gas guide pipe of the switch cabinet passes through the controllable one-way gas valve and then converges in the gas collecting pipe, and then an outlet of the gas collecting pipe is connected with a sealing box body of the pyrolysis particle and characteristic gas monitoring module through a section of gas guide pipe. The overheat defect can be found in an extremely early stage, and the method has the advantages of being safe, economical and accurate.

Description

Technical Field

[0001] The present invention relates to the field of fire warning for transformer substations, and more specifically, to a switch cabinet fire warning device and method based on a pyrolysis particle sensor. Background Art

[0002] Switchgear is an important equipment in the power system, but switchgear fire failures often occur, causing huge economic losses. Especially in the switchgear cable room, the probability of failure is higher.

[0003] The switch cabinet cable room is a high-voltage compartment, and sensors cannot be installed in its space. Some switch cabinets are equipped with smoke alarms or temperature sensors, which have low sensitivity. By the time the alarm sounds, a serious open fire has already occurred. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a switch cabinet fire warning device and method based on a pyrolysis particle sensor, which can detect overheating defects at an extremely early stage and has the advantages of safety, economy and accuracy.

[0005] The object of the present invention is achieved through the following solutions:

[0006] A switch cabinet fire warning device based on a pyrolytic particle sensor comprises a monitoring host, a pyrolytic particle and characteristic gas monitoring module, an environmental monitoring module and an exhaust module, wherein the pyrolytic particle and characteristic gas monitoring module and the environmental monitoring module are electrically connected to the monitoring host respectively;

[0007] The gas extraction module includes a gas conduit, a controllable one-way gas valve and a gas collecting pipe, and the gas conduit is connected to a sealing flange on the back of the switch cabinet; a hole is opened on the back of the switch cabinet near the top of the cable room, and then a sealing flange is installed, and the gas conduit passes through the sealing flange and connects to the cable room space of the switch cabinet; the gas conduits of all the switch cabinets are gathered in the gas collecting pipe after passing through the controllable one-way gas valve, and then the outlet of the gas collecting pipe is connected to the sealed box of the pyrolysis particle and characteristic gas monitoring module through a section of gas conduit;

[0008] The monitoring host is used to collect data from the pyrolysis particle and characteristic gas monitoring module, the environmental monitoring module and the exhaust module, and to provide an early warning of overheating defects or fire through an algorithm.

[0009] Furthermore, the monitoring host collects data from the pyrolysis particle and characteristic gas monitoring module, the environmental monitoring module and the exhaust module through the 485 bus, and displays the monitoring data on the screen.

[0010] Furthermore, the monitoring host is also connected to a controllable one-way gas valve to control the opening and closing of the gas valve.

[0011] Furthermore, the pyrolytic particle and characteristic gas monitoring module includes a sealed box, a pyrolytic particle sensor and a characteristic gas sensor.

[0012] Furthermore, the sealed box has an air inlet and an air outlet at both ends, both of which are respectively equipped with sealing flanges, which are respectively connected to the gas ducts of the exhaust module; a pyrolysis particle sensor and a characteristic gas sensor are installed on the top of the sealed box, and the pyrolysis particle sensor and the characteristic gas sensor communicate with the monitoring host through a bus.

[0013] Furthermore, the characteristic gas sensors include CO, C2H4, C2H6, and CH3cl, and the measurement range and resolution of the four gas sensors are the same.

[0014] Furthermore, the environmental monitoring module includes an air quality sensor and a temperature and humidity sensor, and is installed on the outer wall of the switch cabinet under test.

[0015] Furthermore, the vacuum module also includes a vacuum pump and a gas flow meter, the vacuum pump is connected to the gas flow meter, and the gas flow meter is connected to the gas duct. During the monitoring process, the flow rate of the vacuum gas is monitored by the gas flow meter.

[0016] A switch cabinet fire warning method based on a pyrolytic particle sensor, based on the device as described in any one of the above items, comprises the following steps:

[0017] Step 1: The monitoring host controls the controllable one-way valves 1-n to open, and adjusts the vacuum pump to control the air extraction flow;

[0018] Step 2: Monitor the data of the environment monitoring module and the pyrolysis particle and characteristic gas monitoring module through the monitoring host. Set the pyrolysis particle monitoring value to R, CO, C2H4, C2H6, CH3cl characteristic gas monitoring values ​​to G1, G2, G3 and G4 respectively, and the PM2.5 value in the air quality sensor to K; perform data processing and judgment as follows:

[0019] Step (1), if the pyrolysis particle monitoring data R does not exceed the set threshold TR, that is, R < TR, at this time G1, G2, G3, G4 are all 0, it indicates that the switch cabinet is in normal working condition, and the current switch tube cable room operating condition score is the full score of the set value, and the full score of the set value includes 10 points;

[0020] Step (2), if the pyrolysis particle monitoring data R does not exceed the set threshold TR, that is, R < TR, at this time, a value among G1, G2, G3, G4 is not 0, and the non-zero time lasts for T1 seconds or more, then the current state score is performed according to the following formula:

[0021] The state score S = k1 * SR + k2 * SG1 * k3 * SG2 + k4 * SG3 + k5 * SG4;

[0022] SR, SG1, SG2, SG3, SG4 are the state scores of pyrolysis particles, CO, C2H4, C2H6, and CH3Cl characteristic gases respectively; K1, k2, k3, k4, k5 are the state score weight coefficients respectively; at this time, SR = 10; S = k1 * 10 + k2 * SG1 * k3 * SG2 + k4 * SG3 + k5 * SG4; according to different scores, different risk levels are divided and corresponding measures are taken;

[0023] Step (3), if the pyrolysis particle monitoring data R exceeds the set threshold TR at time t1, that is, R > TR, and the value of R remains in the state of R > TR within the T2 time period after t1, at this time, an evaluation is made according to the value of K. If:

[0024] 1) K exceeds the set threshold TK at time t2, and the value of K remains in the state of K > TK within the T2 time period after t2; if t1 > t2, then look at the values of G1, G2, G3, G4: if G1, G2, G3, G4 are all 0, it indicates that the switch cabinet is in normal working state, and the running state score of the current switch tube cable chamber is the full score of the set value, and the full score of the set value includes 10 points; if a certain value in G1, G2, G3, G4 is not 0, and the time when it is not 0 lasts for T1 seconds or more, then calculate the state score, and different risk levels are divided according to different state scores and corresponding measures are taken;

[0025] 2) K exceeds the set threshold TK at time t2, and the value of K remains in the state of K > TK within the T2 time period after t2, t1 < t2; or, K never exceeds TK, then the following processing is carried out:

[0026] The first step: Determine which switch cabinet cable chamber has a fire hazard. Control the controllable one-way valve 1 to close through the monitoring host, and monitor whether the value of R shows a downward trend within the set time after this moment, that is, R' < 0, where R' is the first derivative of the R data. If so, it is the first switch cabinet. If not, open the controllable one-way valve 1; then close the controllable one-way valve 2 and repeat the judgment until it is found which switch cabinet cable chamber has a fire hazard;

[0027] The second step: Evaluate the risk level of the switch cabinet: S = k1 * SR + k2 * SG1 * k3 * SG2 + k4 * SG3 + k5 * SG4; where, SR = 10 - (R - K) / K. If the calculated SR is less than 0, then take SR = 0;

[0028] SG1: If G1>0, and the time lasts for T1 seconds or more, SG1=0; otherwise SG1=10;

[0029] SG2: If G2>0, and the time lasts for T1 seconds or more, SG2=0; otherwise SG2=10;

[0030] SG3: If G3>0, and the time lasts for T1 seconds or more, SG3=0; otherwise SG3=10;

[0031] SG4: If G4>0, and the time lasts for T1 seconds or more, SG4=0; otherwise SG4=10;

[0032] Step 3: Take appropriate measures based on the risk assessment level.

[0033] Furthermore, the thresholds TR and TK are dynamically adjusted with the temperature and humidity measured by the environmental monitoring module; the initial values ​​of the state weight coefficients are processed as follows: k1=0.6, k2=0.04, k3=0.08, k4=0.08, k5=0.2; and the initial weight coefficients are obtained through expert evaluation and hierarchical analysis method, which can be dynamically corrected according to different scenarios and actual conditions.

[0034] The beneficial effects of the present invention include:

[0035] The present invention adopts the form of an air extraction duct, and there is no need to install a sensor inside the cable room of the switch cabinet, which is safer and more feasible.

[0036] The present invention can use a pyrolysis particle sensor to determine which switch cabinet has hidden dangers, which is more economical.

[0037] The present invention removes interference by comparing environmental particle monitoring data, and uses pyrolysis particle sensors and gas sensors for comprehensive evaluation, which is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 4 is a structural block diagram of a device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] All features disclosed in all embodiments in this specification, or steps in all methods or processes implicitly disclosed, except for mutually exclusive features and / or steps, can be combined and / or expanded or replaced in any manner.

[0041] The specific implementation process of the present invention is as follows:

[0042] On the one hand, in a preferred embodiment, a switch cabinet extremely early fire warning device based on a pyrolytic particle sensor is provided, including a monitoring host, a pyrolytic particle and characteristic gas monitoring module, an environmental monitoring module and an exhaust module.

[0043] The main function of the monitoring host is to collect data from the pyrolysis particle and characteristic gas monitoring module, environmental monitoring module and exhaust module through the 485 bus, and to issue overheating defect or fire warning through the corresponding algorithm, and to display it on the screen. In addition, the monitoring host is also connected to the controllable one-way gas valve through the control circuit to control the conduction and closing of the gas valve.

[0044] The pyrolytic particle and characteristic gas monitoring module is mainly composed of a sealed box, a pyrolytic particle sensor, and a characteristic gas sensor. The sealed box is made of acrylic or epoxy material, with a size not greater than 0.4m×0.3m×0.3m. There is an air inlet and an air outlet at both ends of the sealed box, both of which are respectively equipped with sealing flanges, which are respectively connected to the gas duct of the exhaust module. The pyrolytic particle sensor and the characteristic gas sensor are installed on the top of the sealed box, and the pyrolytic particle sensor and the characteristic gas sensor communicate with the monitoring host through the 485 bus.

[0045] The characteristic gas sensors used in the present invention include CO, C2H4, C2H6, and CH3Cl. The range and resolution of the four gas sensors are the same.

[0046] The environmental monitoring module is mainly composed of air quality sensors and temperature and humidity sensors, and is installed on the outer wall of the switch cabinet under test.

[0047] The exhaust module is mainly composed of a vacuum pump, a gas flow meter, a gas conduit (the blue line in the figure), a controllable one-way gas valve, and a gas collecting pipe. During the monitoring process, the gas flow meter is used to monitor the exhaust flow rate of 5L / min.

[0048] The gas duct is connected to the sealing flange on the back of the switch cabinet. First, a hole is opened on the back of the switch cabinet, near the top of the cable room, and then the sealing flange is installed. The gas duct passes through the sealing flange and connects to the cable room space of the switch cabinet. The gas ducts of all switch cabinets are gathered in the gas collecting pipe after passing through the controllable one-way valve, and then the outlet of the gas collecting pipe is connected to the sealed box of the pyrolysis particle and characteristic gas monitoring module through a gas duct.

[0049] On the other hand, in a preferred embodiment, a switch cabinet very early fire warning method based on a pyrolysis particle sensor is provided, such as Figure 1 As shown, after the above device is installed, the monitoring host controls the controllable one-way valves 1-n to open, and adjusts the vacuum pump to a suitable output so that the air flow rate of the flow meter is about 5L / min.

[0050] By monitoring the host, monitoring the data of the environment monitoring module and the pyrolysis particle and characteristic gas monitoring module, the pyrolysis particle monitoring value is set to R, the monitoring values ​​of CO, C2H4, C2H6, CH3cl characteristic gases are G1, G2, G3 and G4 respectively, and the PM2.5 value in the air quality sensor is K.

[0051] Further, data processing and determination are performed as follows:

[0052] (1) If the pyrolysis particle monitoring data R does not exceed the set threshold TR, that is, R<TR, then G1, G2, G3, and G4 are all 0, indicating that the switch cabinet is working normally, and the current switch tube cable room operating status score is 10 points.

[0053] (2) If the pyrolysis particle monitoring data R does not exceed the set threshold TR, that is, R<TR, at this time, a value in G1, G2, G3, G4 is not 0, and the non-zero time lasts for T1 seconds or more, then the current state score is performed according to the following formula (T1 can be 5 seconds). State score S=k1*SR+k2*SG1*k3*SG2+k4*SG3+k5*SG4; SR, SG1, SG2, SG3, SG4 are the state scores of pyrolysis particles, CO, C2H4, C2H6, CH3cl characteristic gases respectively. K1, k2, k3, k4, k5 are the state score weight coefficients respectively.

[0054] At this time, SR=10, then S=k1*10+k2*SG1*k3*SG2+k4*SG3+k5*SG4; process according to the following table 1:

[0055] Table 1

[0056]

[0057] (3) If the pyrolysis particle monitoring data R exceeds the set threshold TR at time t1, that is, R>TR, and the value of R remains R>TR in the time period T2 after t1 (T2 can be 1 second or 2 seconds).

[0058] At this point, it is necessary to evaluate based on the value of K. If:

[0059] 1) K exceeds the set threshold value TK at time t2, and the value of K remains in the state of K>TK within the time period T2 after t2 (the value of TK can be set to be consistent with TR);

[0060] If t1>t2, then look at the values ​​of G1, G2, G3, and G4:

[0061] (A) If G1, G2, G3, and G4 are all 0, it indicates that the switch cabinet is working normally. The current switch cabinet cable room operating status score is 10 points.

[0062] (B) If any value among G1, G2, G3, G4 is not 0 and the non-zero time lasts for T1 seconds or more, the status score is calculated, and different risk levels are classified according to different status scores and corresponding measures are taken. Specifically, the method (2) can be used for processing.

[0063] 2) K exceeds the set threshold TK at time t2, and the value of K remains K>TK in the time period T2 after t2, t1 <t2;

[0064] Or, if K never exceeds TK, proceed as follows:

[0065] Step 1: Determine which switch cabinet cable room has a fire hazard

[0066] The controllable one-way gas valve 1 is closed by the monitoring host, and the R value is monitored within 30 seconds after this moment to see whether it shows a downward trend, that is, R'<0 (R' is the first-order derivative of the R data). If so, it is the first switch cabinet, if not, open the controllable one-way gas valve 1;

[0067] Then close the controllable one-way gas valve 2 and repeat the above steps to make a judgment until you find which switch cabinet cable room has a fire hazard.

[0068] Step 2: Assess the risk level of the switchgear

[0069] S=k1*SR+k2*SG1*k3*SG2+k4*SG3+k5*SG4;

[0070] Wherein, SR = 10-(RK) / K. If the calculated SR is less than 0, SR = 0.

[0071] SG1: If G1>0, and the time lasts for T1 seconds or more, SG1=0; otherwise SG1=10;

[0072] SG2: If G2>0, and the time lasts for T1 seconds or more, SG2=0; otherwise SG2=10;

[0073] SG3: If G3>0, and the time lasts for T1 seconds or more, SG3=0; otherwise SG3=10;

[0074] SG4: If G4>0, and the time lasts for T1 seconds or more, SG4=0; otherwise SG4=10;

[0075] Step 3: Take appropriate measures based on risk assessment, as shown in Table 2 below.

[0076] Table 2

[0077]

[0078] In the above implementation, the thresholds TR and TK need to be dynamically adjusted according to the temperature and humidity measured by the environment monitoring module.

[0079] In the above implementation, the initial value of the weight coefficient is processed as follows: k1=0.6, k2=0.04, k3=0.08, k4=0.08, k5=0.2. The basis for the initial value of the weight coefficient is that, through the previous laboratory test data, it was found that the sensitivity of pyrolytic particles is always higher than that of gas sensors, so the score weight of pyrolytic particles is higher. Among the four gases, if CH3cl gas containing chlorine appears, it means that the outer sheath PVC material of the cable begins to pyrolyze (indicating that the internal temperature is higher), so G4 has a higher weight in the gas. CO may be subject to certain interference, so the weight of CO is relatively small. Then, the initial weight coefficient is obtained through expert evaluation and hierarchical analysis. These weight coefficients can also be dynamically corrected according to different scenarios and actual conditions.

[0080] The units involved in the embodiments of the present invention may be implemented by software or hardware, and the units described may also be arranged in a processor. The names of these units do not, in some cases, limit the units themselves.

[0081] According to one aspect of an embodiment of the present invention, a computer program product or a computer program is provided, the computer program product or the computer program includes a computer instruction, and the computer instruction is stored in a computer-readable storage medium. A processor of a computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the method provided in the above various optional implementations.

[0082] As another aspect, an embodiment of the present invention further provides a computer-readable medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being assembled into the electronic device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by an electronic device, the electronic device implements the method described in the above embodiment.

Claims

1. A switch cabinet fire warning device based on pyrolysis particle sensor, characterized in that: It includes a monitoring host, a pyrolysis particle and characteristic gas monitoring module, an environmental monitoring module and a gas extraction module, wherein the pyrolysis particle and characteristic gas monitoring module and the environmental monitoring module are electrically connected to the monitoring host respectively; The gas extraction module includes a gas conduit, a controllable one-way gas valve and a gas collecting pipe, and the gas conduit is connected to a sealing flange on the back of the switch cabinet; a hole is opened on the back of the switch cabinet near the top of the cable room, and then a sealing flange is installed, and the gas conduit passes through the sealing flange and connects to the cable room space of the switch cabinet; the gas conduits of all the switch cabinets are gathered in the gas collecting pipe after passing through the controllable one-way gas valve, and then the outlet of the gas collecting pipe is connected to the sealed box of the pyrolysis particle and characteristic gas monitoring module through a section of gas conduit; The monitoring host is used to collect data from the pyrolysis particle and characteristic gas monitoring module, the environmental monitoring module and the exhaust module, and to provide an early warning of overheating defects or fire through an algorithm.

2. The switch cabinet fire warning device based on pyrolytic particle sensor according to claim 1 is characterized in that: The monitoring host specifically collects data from the pyrolysis particle and characteristic gas monitoring module, the environmental monitoring module and the exhaust module through the 485 bus, and displays the monitoring data on the screen.

3. The switch cabinet fire warning device based on pyrolytic particle sensor according to claim 1 is characterized in that: The monitoring host is also connected to a controllable one-way gas valve to control the opening and closing of the gas valve.

4. The switch cabinet fire warning device based on pyrolytic particle sensor according to claim 1 is characterized in that: The pyrolytic particle and characteristic gas monitoring module comprises a sealed box, a pyrolytic particle sensor and a characteristic gas sensor.

5. The switch cabinet fire warning device based on pyrolytic particle sensor according to claim 4 is characterized in that: The sealed box has an air inlet and an air outlet at both ends, both of which are respectively equipped with sealing flanges, which are respectively connected to the gas ducts of the exhaust module; a pyrolysis particle sensor and a characteristic gas sensor are installed on the top of the sealed box, and the pyrolysis particle sensor and the characteristic gas sensor communicate with the monitoring host through a bus.

6. The switch cabinet fire warning device based on pyrolytic particle sensor according to claim 4 is characterized in that: The characteristic gas sensors include CO, C2H4, C2H6, and CH3cl, and the measurement ranges and resolutions of the four gas sensors are the same.

7. The switch cabinet fire warning device based on pyrolytic particle sensor according to claim 1 is characterized in that: The environmental monitoring module includes an air quality sensor and a temperature and humidity sensor, and is installed on the outer wall of the switch cabinet under test.

8. The switch cabinet fire warning device based on pyrolytic particle sensor according to claim 1 is characterized in that: The vacuum module also includes a vacuum pump and a gas flow meter. The vacuum pump is connected to the gas flow meter, and the gas flow meter is connected to the gas conduit. During the monitoring process, the flow of the vacuumed gas is monitored by the gas flow meter.

9. A switch cabinet fire warning method based on pyrolytic particle sensor, characterized in that: The device according to any one of claims 1 to 8 comprises the following steps: Step 1: The monitoring host controls the controllable one-way valves 1-n to open, and adjusts the vacuum pump to control the air extraction flow; Step 2: Monitor the data of the environment monitoring module and the pyrolysis particle and characteristic gas monitoring module through the monitoring host. Set the pyrolysis particle monitoring value to R, CO, C2H4, C2H6, CH3cl characteristic gas monitoring values ​​to G1, G2, G3 and G4 respectively, and the PM2.5 value in the air quality sensor to K; perform data processing and judgment as follows: Step (1), if the pyrolysis particle monitoring data R does not exceed the set threshold TR, that is, R < TR, at this time G1, G2, G3, G4 are all 0, it indicates that the switch cabinet is in normal working condition, and the current switch tube cable room operating condition score is the full score of the set value, and the full score of the set value includes 10 points; Step (2), if the pyrolysis particle monitoring data R does not exceed the set threshold TR, that is, R < TR, and at this time, one of the values of G1, G2, G3, G4 is not 0, and the time when it is not 0 lasts for T1 seconds or more, then the current status score is calculated according to the following formula: Status score S = k1 * SR + k2 * SG1 * k3 * SG2 + k4 * SG3 + k5 * SG4; SR, SG1, SG2, SG3, SG4 are the status scores of pyrolysis particles, CO, C2H4, C2H6, CH3cl characteristic gases respectively; K1, k2, k3, k4, k5 are the status score weight coefficients respectively; at this time, SR = 10; S = k1 * 10 + k2 * SG1 * k3 * SG2 + k4 * SG3 + k5 * SG4; Different risk levels are divided according to different status scores and corresponding measures are taken; Step (3), if the pyrolysis particle monitoring data R exceeds the set threshold TR at time t1, that is, R > TR, and the value of R remains in the state of R > TR within the T2 time period after t1, at this time, an evaluation is made according to the value of K. If: 1) K exceeds the set threshold TK at time t2, and the value of K remains in the state of K > TK within the T2 time period after t2; if t1 > t2, then look at the values of G1, G2, G3, G4: if G1, G2, G3, G4 are all 0, it means that the working state of the switch cabinet is normal, and the running state score of the current switch tube cable chamber is the full score of the set value, and the full score of the set value includes 10 points; if one of the values of G1, G2, G3, G4 is not 0, and the time when it is not 0 lasts for T1 seconds or more, then calculate the status score, divide different risk levels according to different status scores and take corresponding measures; 2) K exceeds the set threshold TK at time t2, and the value of K remains in the state of K > TK within the T2 time period after t2, t1 < t2; or, K never exceeds TK, then the following processing is carried out: First step: Determine which switch cabinet cable chamber has a fire hazard. Control the controllable one-way valve 1 to close through the monitoring host, and monitor whether the value of R shows a downward trend within the set time after this moment, that is, R' < 0, where R' is the first derivative of the R data. If so, it is the first switch cabinet. If not, open the controllable one-way valve 1; then close the controllable one-way valve 2 and repeat the judgment until it is found which switch cabinet cable chamber has a fire hazard; Second step: Evaluate the risk level of the switch cabinet: S = k1 * SR + k2 * SG1 * k3 * SG2 + k4 * SG3 + k5 * SG4; where, SR = 10 - (R - K) / K. If the calculated SR is less than 0, then take SR = 0; SG1: If G1 > 0 and the time lasts for T1 seconds or more, SG1 = 0; otherwise SG1 = 10; SG2: If G2 > 0 and the time lasts for T1 seconds or more, SG2 = 0; otherwise SG2 = 10; SG3: If G3 > 0 and the time lasts for T1 seconds or more, SG3 = 0; otherwise SG3 = 10; SG4: If G4>0, and the time lasts for T1 seconds or more, SG4=0; otherwise SG4=10; Step 3: Take appropriate measures based on the risk assessment level.

10. The switch cabinet fire warning device based on pyrolytic particle sensor according to claim 9, characterized in that: The thresholds TR and TK are dynamically adjusted with the temperature and humidity measured by the environmental monitoring module; the initial values ​​of the state weight coefficients are processed as follows: k1=0.6, k2=0.04, k3=0.08, k4=0.08, k5=0.2; and the initial weight coefficients are obtained through expert evaluation and hierarchical analysis method, which can be dynamically corrected according to different scenarios and actual conditions.

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