CN112945402B - Cable channel fire early warning device and early warning method thereof - Google Patents
Cable channel fire early warning device and early warning method thereof Download PDFInfo
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- CN112945402B CN112945402B CN202110175918.XA CN202110175918A CN112945402B CN 112945402 B CN112945402 B CN 112945402B CN 202110175918 A CN202110175918 A CN 202110175918A CN 112945402 B CN112945402 B CN 112945402B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims description 21
- 238000009413 insulation Methods 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 6
- 238000013508 migration Methods 0.000 claims description 3
- 230000005012 migration Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 3
- 230000037361 pathway Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 10
- 230000008859 change Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/026—Means for indicating or recording specially adapted for thermometers arrangements for monitoring a plurality of temperatures, e.g. by multiplexing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
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Abstract
The invention relates to the technical field of electronic safety, in particular to a cable channel fire early warning device and a fire early warning method thereof, comprising the disclosed cable channel fire early warning device and the fire early warning method thereof, wherein the whole course measurement of a cable channel can be realized through acquisition modules connected end to end, and compared with the traditional method which adopts a plurality of temperature sensors, the cost is greatly reduced, but the acquisition range is greatly improved; the temperature change is determined by a mode that the memory alloy drives laser reflection, so that the temperature detection precision can be improved, and accurate data support is provided for fire early warning; the fire early warning server receives the signals and draws a graph, wherein the abscissa of the graph is time, and the ordinate is the number of steps; and the fire early warning server establishes a judging model according to a graph drawn by the received real-time data, processes and compares the real-time temperature data in the cable channel through a manually defined algorithm, so as to judge whether to alarm or not, and improve the accuracy of detection and early warning.
Description
Technical Field
The invention relates to the technical field of electric power safety, in particular to a cable channel fire early warning device and an early warning method thereof.
Background
A plurality of cables exist in the cable channel, and in the long-term operation process of the cables, the cables can burn due to ageing and overheating of the middle heads of the cables; short circuits of low voltage cables within the cable channels may also cause other cables to burn. Burning of one cable may ignite other cables in the same cable trough as well, causing significant losses.
The traditional detection mode detects local cables by arranging a plurality of temperature sensors in the cable channel, and the detection mode only can detect local areas of the cables, has huge cost consumption and can not detect the whole cable, and has great limitation, thereby influencing the detection precision.
In view of the above problems, the present inventors have actively studied and innovated based on the practical experience and expertise that are rich for many years in such product engineering applications, so as to create a cable channel fire early warning device and an early warning method thereof, which make the cable channel fire early warning device more practical.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the cable channel fire early warning device and the early warning method thereof are provided, the detection precision is improved, and the high-efficiency early warning is realized.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a cable pathway fire early warning device comprising: the system comprises an acquisition module, a signal processing module, a wireless transceiver module, a power supply module and an early warning server, wherein the signal processing module processes a temperature signal acquired by the acquisition module and then sends the temperature signal to the early warning module through the wireless transceiver module;
the acquisition module comprises a memory alloy, a movable plate, a reflecting mirror surface, a laser emitter and a photoelectric sensor, wherein one end of the memory alloy is fixedly connected with one end of the movable plate, the reflecting mirror surface is arranged at one end of the movable plate far away from the memory alloy, the movable plate is arranged in the vertical direction through a rotating shaft, the memory alloy can drive the movable plate to rotate by taking the rotating shaft as a rotating center, the photoelectric sensor is arranged above the mirror surface and the laser emitter corresponding to the memory alloy, and a plurality of photoelectric sensors are arranged along the length direction of a cable;
the power supply module is used for providing power for the laser transmitter, the photoelectric sensor, the signal processing module and the wireless transceiver module respectively, and the acquisition module is arranged above the cable and is provided with a plurality of acquisition modules in parallel along the length direction of the cable in a tail-ending way.
Further, the acquisition module is arranged in the shell and is divided into an upper layer and a lower layer through the heat insulation plate, the power supply module, the signal processing module and the wireless receiving and transmitting module, the shell is arranged below the heat insulation plate, and the shell is arranged along the length direction of the cable;
the photoelectric sensor is hung and arranged below the heat insulation plate, the memory alloy corresponds to the photoelectric sensor and is arranged below the heat insulation plate, the movable plate and the laser transmitter are respectively arranged at two ends of the length direction of the shell, the laser transmitter and the reflecting mirror face are arranged on the same horizontal plane and are both positioned between the heat insulation plate and the memory alloy, and the bottom of the shell corresponds to the memory alloy and is provided with a window which is convenient for the memory alloy to sense the external temperature.
Further, one end of the movable plate provided with the reflecting mirror surface is connected with one end of the shell through an elastic piece, and the movable plate is slightly inclined along the vertical direction.
Further, a plurality of the photosensors are provided at equal intervals, and the photosensors near the laser emitter are provided at positions capable of receiving the light signal of the laser emitter refracted by the reflecting mirror surface in the initial state of the memory alloy.
Further, the interval setting between the photoelectric sensors includes the following steps:
s01: measuring the inclination angle of the movable plate in the initial state of the memory alloy when the photoelectric sensor close to the laser transmitter can receive the optical signal, and setting the inclination angle as A;
s02: measuring the vertical distance between the refraction point of the reflecting mirror surface and the heat insulation plate, and setting the vertical distance as H;
s03: selecting the number of photoelectric sensors to be set according to the early warning sensitivity required by the environment, and setting the number of the photoelectric sensors as B;
s04: the spacing distance of the photosensors is set to X, and x= [ H (1-tanA) ]/(B-tanA).
Further, the signal processing module comprises a filtering circuit and an amplifying circuit, and the filtering circuit and the amplifying circuit are used for filtering and amplifying signals acquired by the photoelectric sensor.
A cable channel fire early warning device and an early warning method thereof comprise the following steps:
s1: arranging a plurality of fire early-warning devices in a cable channel in parallel from head to tail, and arranging one side provided with a window towards a cable;
s2: adjusting the position of the photoelectric sensor so that the photoelectric sensor closest to the laser transmitter is positioned at the irradiation position of the initial reflected light of the reflecting mirror surface;
s3: the signal is acquired in real time through the photoelectric sensor and is filtered and amplified through the signal processing module, and the signal is transmitted to the fire disaster early warning server through the wireless transceiver module;
s4: the fire early warning server receives the signals and draws a graph, wherein the abscissa of the graph is set as time, and the ordinate is a parallel serial number of the triggering photoelectric sensor and is set as a class number;
s5: the fire early warning server establishes a judgment model after manual definition according to a graph drawn by the received real-time data;
s6: and comparing the real-time data received by the fire early-warning server with the judging model to judge whether an early-warning signal is sent.
Further, the establishment of the judgment model comprises the following steps:
s51: the method comprises the steps that a graph with gradually increased temperature along with time migration in a cable channel is collected through a collection module, time is taken as an abscissa, and the number of steps is taken as an ordinate;
s52: setting a time constant value, and intercepting a graph in each time constant value;
s53: acquisition t 1 To t N A curve segment within N time constant values;
s54: and the number of grades in each time period is L respectively 1 、L 2 ……L N And calculate average number of steps L eq =( L 1 +L 2 +……+L N )/N；
S55: calculating a rank increase coefficient k= (L) in two ending time periods in N time constant values 1 +L N )/(t 1 + t N )；
S56: setting a discrimination coefficient k=k (L N -L 1 )/L eq ；
S57: acquisition t 2 To t N+1 Is repeated from step S54 to step S56.
Further, the early warning coefficient interval of the discrimination coefficient K is 1-C < K < 1+C, wherein C=0-0.2, and when the discrimination coefficient exceeds the early warning interval, the early warning device sends out an alarm signal.
The beneficial effects of the invention are as follows: according to the cable channel fire early warning device and the cable channel fire early warning method disclosed by the invention, the whole course measurement of the cable channel can be realized through the acquisition modules connected end to end, and compared with the traditional method adopting a plurality of temperature sensors, the cost is greatly reduced, but the acquisition range is greatly improved; the temperature change is determined by a mode that the memory alloy drives laser reflection, so that the temperature detection precision can be improved, and accurate data support is provided for fire early warning; and establishing a judgment model, and processing and comparing the real-time temperature data in the cable channel by using a manually defined algorithm, so that the accuracy of detection and early warning is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic diagram of a cable passage fire alarm device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the operation of a fire early warning device for a cable channel according to an embodiment of the present invention;
fig. 3 is a logic frame diagram of a cable channel fire early warning method according to an embodiment of the invention.
Reference numerals: 1. an acquisition module; 11. a memory alloy; 12. a movable plate; 13. a reflecting mirror surface; 14. a laser emitter; 15. a photoelectric sensor; 16. a rotation shaft; 17. an elastic member; 2. a signal processing module; 3. a wireless transceiver module; 4. a power supply module; 5. a housing; 51. and the heat insulation plate.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The cable channel fire early warning device as shown in fig. 1-2 comprises an acquisition module 1, a signal processing module 2, a wireless transceiver module 3, a power supply module 4 and an early warning server, wherein the signal processing module 2 processes a temperature signal acquired by the acquisition module 1 and then sends the temperature signal to the early warning server through the wireless transceiver module 3; the acquisition module 1 comprises a memory alloy 11, a movable plate 12, a reflecting mirror surface 13, a laser emitter 14 and a photoelectric sensor 15, wherein one end of the memory alloy 11 is fixedly connected with one end of the movable plate 12, the reflecting mirror surface 13 is arranged at one end of the movable plate 12 far away from the memory alloy 11, the movable plate 12 is arranged in the vertical direction through a rotating shaft 16, the memory alloy 11 can drive the movable plate 12 to rotate by taking the rotating shaft 16 as a rotating center, the photoelectric sensor 15 is arranged above the mirror surface and the laser emitter 14 corresponding to the memory alloy 11, and a plurality of photoelectric sensors 15 are arranged along the length direction of a cable; the power supply module 4 provides power for the laser transmitter 14, the photoelectric sensor 15, the signal processing module 2 and the wireless transceiver module 3 respectively, and the acquisition module 1 is arranged above the cable and is provided with a plurality of parallel tail pipes along the length direction of the cable. Specifically, when the memory alloy 11 is heated and contracted, the movable plate 12 is driven to rotate by taking the rotating shaft 16 as the center, the reflecting angle of the reflecting mirror surface 13 arranged at the other end of the movable plate 12 is changed accordingly, and the photoelectric sensors 15 at different positions are used for receiving the light rays emitted from the laser transmitters 14 to the reflecting mirror surface 13 and reflected by the reflecting mirror surface 13, so that the accurate judgment of different temperature levels is realized. The whole-course measurement of the cable channel is realized by connecting the early warning device in an end-to-end manner, so that compared with the traditional method which adopts a plurality of temperature sensors, the cost is greatly reduced, but the acquisition range is greatly improved; the temperature change is determined by driving the laser reflection mode through the memory alloy 11, so that the temperature detection precision can be improved, and accurate data support is provided for fire early warning.
As a preference of the above embodiment, the collecting module 1 is disposed in the housing 5 and is divided into an upper layer and a lower layer by the heat insulation plate 51, the power supply module 4, the signal processing module 2 and the wireless transceiver module 3, the housing 5 is disposed below the heat insulation plate 51 and the housing 5 is disposed along the length direction of the cable; the photoelectric sensor 15 is hung and arranged below the heat insulation plate 51, the memory alloy 11 is arranged below the photoelectric sensor 15 corresponding to the photoelectric sensor 15, the movable plate 12 and the laser transmitter 14 are respectively arranged at two ends of the shell 5 in the length direction, the laser transmitter 14 and the reflecting mirror surface 13 are arranged on the same horizontal plane and are both positioned between the heat insulation plate 51 and the memory alloy 11, a window is formed in the bottom of the shell 5 corresponding to the memory alloy 11, and the memory alloy 11 is convenient to sense the external temperature. The signal processing module 2 includes a filter circuit and an amplifying circuit for performing filtering and amplifying processing on the signal collected by the photoelectric sensor 15.
As a preferable example of the above embodiment, the end of the movable plate 12 where the reflecting mirror surface 13 is provided is connected to the end of the housing 5 by the elastic member 17, and the movable plate 12 is slightly inclined in the vertical direction. Specifically, a plurality of photosensors 15 are disposed at equal intervals, and the photosensors 15 near the laser emitter 14 are disposed at positions capable of receiving the light signal of the laser emitter 14 refracted by the reflecting mirror surface 13 in the initial state of the memory alloy 11.
As a preferable example of the above embodiment, the interval setting between the photosensors 15 includes the steps of: s01: when the photoelectric sensor 15 close to the laser transmitter 14 can receive the optical signal, the inclination angle of the movable plate 12 in the initial state of the memory alloy 11 is set as A; s02: measuring the vertical distance between the refraction point of the reflecting mirror surface 13 and the heat insulation plate 51, and setting the vertical distance as H; s03: selecting the number of the photoelectric sensors 15 to be set according to the early warning sensitivity required by the environment, and setting the number of the photoelectric sensors 15 as B; s04: the separation distance of the photosensors 15 is set to X, and x= [ H (1-tanA) ]/(B-tanA).
The early warning method of the cable channel fire early warning device shown in fig. 3 comprises the following steps: s1: arranging a plurality of fire early-warning devices in a cable channel in parallel from head to tail, and arranging one side provided with a window towards a cable; s2: adjusting the position of the photoelectric sensor so that the photoelectric sensor closest to the laser transmitter is positioned at the irradiation position of the initial reflected light of the reflecting mirror surface; s3: the signal is acquired in real time through the photoelectric sensor and is filtered and amplified through the signal processing module, and the signal is transmitted to the fire disaster early warning server through the wireless transceiver module; s4: the fire early warning server receives the signals and draws a graph, wherein the abscissa of the graph is set as time, and the ordinate is a parallel serial number of the triggering photoelectric sensor and is set as a class number; s5: the fire early warning server establishes a judgment model after manual definition according to a graph drawn by the received real-time data; s6: and comparing the real-time data received by the fire early-warning server with the judging model to judge whether an early-warning signal is sent.
Preferably, the establishing of the judgment model includes the following steps: s51: the method comprises the steps that a graph with gradually increased temperature along with time migration in a cable channel is collected through a collection module, time is taken as an abscissa, and the number of steps is taken as an ordinate; s52: setting a time constant value, and intercepting a graph in each time constant value; s53: acquisition t 1 To t N A curve segment within N time constant values; s54: and the number of grades in each time period is L respectively 1 、L 2 ……L N And calculate average number of steps L eq =( L 1 +L 2 +……+L N ) N; s55: calculating a rank increase coefficient k= (L) in two ending time periods in N time constant values 1 +L N )/(t 1 + t N ) The method comprises the steps of carrying out a first treatment on the surface of the S56: setting a discrimination coefficient k=k (L N -L 1 )/L eq The method comprises the steps of carrying out a first treatment on the surface of the S57: acquisition t 2 To t N+1 Is repeated from step S54 to step S56. And setting an early warning coefficient interval of the discrimination coefficient K to be 1-C < K < 1+C, wherein C=0-0.2, and sending an alarm signal by the early warning device when the discrimination coefficient exceeds the early warning interval. In the invention, a judgment model is established, and real-time temperature data in the cable channel is processed and compared through a manually defined algorithm, so that the accuracy of detection and early warning is improved.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A cable pathway fire early warning device, comprising: the system comprises an acquisition module (1), a signal processing module (2), a wireless transceiver module (3), a power supply module (4) and an early warning server, wherein the signal processing module (2) processes a temperature signal acquired by the acquisition module (1) and then sends the temperature signal to the early warning server through the wireless transceiver module (3);
the acquisition module (1) comprises a memory alloy (11), a movable plate (12), a reflecting mirror surface (13), a laser emitter (14) and a photoelectric sensor (15), one end of the memory alloy (11) is fixedly connected with one end of the movable plate (12), the reflecting mirror surface (13) is arranged at one end, far away from the memory alloy (11), of the movable plate (12), the movable plate (12) is arranged in the vertical direction through a rotating shaft (16), the memory alloy (11) can drive the movable plate (12) to rotate by taking the rotating shaft (16) as a rotating center, the photoelectric sensor (15) is arranged above the mirror surface and the laser emitter (14) corresponding to the memory alloy (11), and a plurality of photoelectric sensors (15) are arranged in the length direction of a cable;
the power supply module (4) is used for respectively providing power for the laser transmitter (14), the photoelectric sensor (15), the signal processing module (2) and the wireless transceiver module (3), and the acquisition module (1) is arranged above a cable and is provided with a plurality of acquisition modules in parallel along the length direction of the cable in a tail-end manner;
the acquisition module (1) is arranged in the shell (5) and is divided into an upper layer and a lower layer by the heat insulation plate (51), the power supply module (4), the signal processing module (2) and the wireless receiving and transmitting module (3), the shell (5) is arranged below the heat insulation plate (51) and the shell (5) is arranged along the length direction of the cable;
the photoelectric sensor (15) is hung below the heat insulation plate (51), the memory alloy (11) is arranged below the photoelectric sensor (15) corresponding to the photoelectric sensor, the movable plate (12) and the laser transmitter (14) are respectively arranged at two ends of the shell (5) in the length direction, the laser transmitter (14) and the reflecting mirror surface (13) are arranged on the same horizontal plane and are both positioned between the heat insulation plate (51) and the memory alloy (11), and a window is formed in the bottom of the shell (5) corresponding to the memory alloy (11) so as to facilitate the memory alloy (11) to sense the external temperature;
the plurality of photoelectric sensors (15) are arranged at equal intervals, and the photoelectric sensor (15) close to the laser transmitter (14) is arranged at a position capable of receiving a light signal of the laser transmitter (14) refracted by the reflecting mirror surface (13) in the initial state of the memory alloy (11).
2. The cable passage fire alarm device according to claim 1, wherein one end of the movable plate (12) provided with the reflecting mirror surface (13) is connected with one end of the housing (5) through an elastic member (17), and the movable plate (12) is arranged slightly inclined in a vertical direction.
3. Cable channel fire warning device according to claim 1, characterized in that the arrangement of the spacing between the photosensors (15) comprises the steps of:
s01: measuring the inclination angle of the movable plate (12) in the initial state of the memory alloy (11) when the photoelectric sensor (15) close to the laser transmitter (14) can receive optical signals, and setting the inclination angle as A;
s02: measuring the vertical distance between the refraction point of the reflecting mirror surface (13) and the heat insulation plate (51), and setting the vertical distance as H;
s03: selecting the number of the photoelectric sensors (15) to be set according to the early warning sensitivity required by the environment, and setting the number of the photoelectric sensors (15) as B;
s04: the distance between the photosensors (15) is set to X, and X= [ H (1-tanA) ]/(B-tanA).
4. The cable channel fire early warning device according to claim 1, characterized in that the signal processing module (2) comprises a filtering circuit and an amplifying circuit for filtering and amplifying the signals collected by the photoelectric sensor (15).
5. The early warning method of the cable channel fire early warning device is characterized by comprising the following steps of:
s1: arranging a plurality of fire early-warning devices in a cable channel in parallel from head to tail, and arranging one side provided with a window towards a cable;
s2: adjusting the position of the photoelectric sensor so that the photoelectric sensor closest to the laser transmitter is positioned at the irradiation position of the initial reflected light of the reflecting mirror surface;
s3: the signal is acquired in real time through the photoelectric sensor and is filtered and amplified through the signal processing module, and the signal is transmitted to the fire disaster early warning server through the wireless transceiver module;
s4: the fire early warning server receives the signals and draws a graph, wherein the abscissa of the graph is set as time, and the ordinate is a parallel serial number of the triggering photoelectric sensor and is set as a class number;
s5: the fire early warning server establishes a judgment model after manual definition according to a graph drawn by the received real-time data;
s6: comparing the real-time data received by the fire early warning server with the judging model to judge whether an early warning signal is sent out;
the establishment of the judgment model comprises the following steps:
s51: the method comprises the steps that a graph with gradually increased temperature along with time migration in a cable channel is collected through a collection module, time is taken as an abscissa, and the number of steps is taken as an ordinate;
s52: setting a time constant value, and intercepting a graph in each time constant value;
s53: acquisition t 1 To t N A curve segment within N time constant values;
s54: and the number of grades in each time period is L respectively 1 、L 2 ……L N And calculate average number of steps L eq =( L 1 +L 2 +……+L N )/N；
S55: calculating a rank increase coefficient k= (L) in two ending time periods in N time constant values 1 +L N )/(t 1 + t N )；
S56: setting a discrimination coefficient k=k (L N -L 1 )/L eq ；
S57: acquisition t 2 To t N+1 Is repeated from step S54 to step S56.
6. The method for early warning of a fire early warning device for a cable channel according to claim 5, wherein the early warning coefficient interval of the discrimination coefficient K is 1-C < K < 1+C, wherein c=0-0.2, and the early warning device sends out an alarm signal when the discrimination coefficient exceeds the early warning interval.
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