KR20190128797A - Measurement system and method for fire risk of cable by temperature - Google Patents

Abstract

Provided is a fire risk measuring system, which comprises: a memory storing resistance value change data in accordance with the temperature change for each of the plurality of cables; a first sensor surrounding an outer surface of a designated cable and measuring a surface temperature of the designated cable; a second sensor measuring an external temperature of the designated cable; a resistance measuring circuit measuring an insulation resistance value of the designated cable; and a processor calculating a difference between the surface temperature and the external temperature, comparing the resistance value change data stored in the memory with the measured insulation resistance value, and calculating a fire probability of the designated cable in accordance with the calculated temperature difference and the comparison result.

Description

MEASUREMENT SYSTEM AND METHOD FOR FIRE RISK OF CABLE BY TEMPERATURE

It relates to a fire hazard measurement system and method, and more particularly to a system and method for measuring the likelihood of fire due to insulation degradation of a cable.

According to the statistics of the Korea Fire and Disaster Prevention Agency, fires caused by cables and wiring devices occur at the highest rate with regard to ignition of electrical fires. In particular, underground power outlets in urban areas are already saturated and temperature rises are caused by dense cable, which is a major cause of fire by accelerating cable insulation deterioration. Although the fire caused by the cable and the wiring apparatus continues to occur, the installation and research of the protection equipment for this is insufficient.

Acceleration of cable insulation due to electrical, mechanical, chemical, thermal or moisture intrusion is the main cause of fire. Internal or external causes cause the temperature of the cable to rise, and as the temperature rises, the resistance of the cable insulator will decrease, which will lead to dielectric breakdown. Insulation deterioration occurs even when there is no change in the appearance of the cable itself, and there is a difficulty in preventing a fire because the degree of deterioration cannot be identified by the naked eye alone. In addition, ground faults and short circuit failures may occur due to internal or external causes of the cable, which may also cause fire.

Republic of Korea Patent Laid-Open No. 10-2014-0145638 relates to a fire fire monitoring system. Specifically, the target patent is configured to receive a first optical wavelength measuring the temperature inside the power sphere in real time from the optical cable to convert into a temperature signal, a configuration to receive a second optical wavelength measuring the location of the fire is converted into a position signal and Disclosed is a configuration of a management unit for receiving and displaying a temperature signal and a position signal.

According to one side, a memory for storing the resistance value change data according to the temperature change for each of the plurality of cables, a first sensor surrounding the outer surface of the designated cable to measure the surface temperature of the designated cable, the external temperature of the specified cable The second sensor for measuring the resistance, the resistance measuring circuit for measuring the insulation resistance value of the specified cable and the difference between the surface temperature and the external temperature, and calculates the resistance value change data stored in the memory and the measured insulation resistance value A fire risk measurement system is provided that includes a processor for comparing and calculating a fire probability of the designated cable according to the calculated temperature difference and the comparison result.

According to an embodiment, the processor determines that a temperature increase factor of the cable exists inside the designated cable when the surface temperature is greater than the external temperature, and when the external temperature is greater than the surface temperature. It can be determined that the temperature rise factor of the cable is present outside the designated cable.

According to another embodiment, a fire hazard measurement system receives the first sensor and the second sensor, supports the first sensor to contact the designated cable along the outer surface, and along a preset rotational direction. It may further include a clamping housing for fastening the designated cable.

According to another embodiment, the clamping housing part may include a screw for applying a force to close the first sensor to the designated cable and a hole through which the screw rotates.

According to another embodiment, when the measured insulation resistance value is smaller than the first threshold value according to the resistance value change data stored in the memory, the communication unit may transmit a fire hazard message for the designated cable to the designated terminal. have.

According to another embodiment, the processor generates a fire hazard message for the designated cable when the temperature increase rate of at least one of the surface temperature and the external temperature is greater than or equal to a preset second threshold, and through the communication unit. The generated fire danger message may be transmitted to the designated terminal.

According to another embodiment, the communication unit receives a temperature increase rate measured by another terminal present in a predefined sensor network, the processor is a temperature rise rate measured by the other terminal and the surface temperature and the external temperature of the At least one temperature increase rate may be compared to validate the fire hazard message.

According to another embodiment, the processor may determine a failure interval based on the position of the terminal indicating the highest temperature rise rate by comparing the temperature rise rate measured by each of the plurality of terminals present in the sensor network.

According to another embodiment, the memory stores the surface temperature and the external temperature measured over time for the designated cable, and the processor is configured to fire the fire hazard message based on the surface temperature and the external temperature stored in the memory. Can be validated.

According to another embodiment, the communication unit receives weather data for the location of the designated cable, the processor corrects the temperature increase rate of at least one of the surface temperature and the external temperature using the received weather data. The correction coefficient is calculated, and the correction coefficient may be determined according to an abnormal voltage value due to lightning introduced into the designated cable.

1 is a block diagram illustrating a fire risk measurement system according to an embodiment.
2A and 2B show resistance value change data according to a cable type stored in a memory.
3A and 3B are exemplary views illustrating a clamping housing part fastened to a cable according to one embodiment.
4A and 4B are cross-sectional views illustrating the clamping housing portion described in FIG. 3A.
5 is a cross-sectional view illustrating a clamping housing part fastened to a cable according to another embodiment.
6A and 6B are flowcharts illustrating a fire risk measuring method according to an exemplary embodiment.
7 is an exemplary view illustrating a process of generating a fire hazard message by a fire hazard measurement system according to another exemplary embodiment.
8 is an exemplary view illustrating a process of verifying validity of a fire danger message by a fire risk measurement system through a sensor network according to another embodiment.

Specific structural or functional descriptions of the embodiments are disclosed for purposes of illustration only, and may be practiced in various forms. Accordingly, the embodiments are not limited to the specific disclosure, and the scope of the present specification includes changes, equivalents, or substitutes included in the technical idea.

Terms such as first or second may be used to describe various components, but such terms should be interpreted only for the purpose of distinguishing one component from another component. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

When a component is referred to as being "connected" to another component, it should be understood that there may be a direct connection or connection to that other component, but there may be other components in between.

Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate that the stated feature, number, step, operation, component, part, or combination thereof is present, but one or more other features or numbers, It is to be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined herein. Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, the same components will be given the same reference numerals regardless of the reference numerals, and duplicate description thereof will be omitted.

1 is a block diagram illustrating a fire risk measurement system according to an embodiment. Referring to FIG. 1, the fire risk measurement system 100 includes a memory 110, a first sensor 120, a second sensor 130, a resistance measurement circuit 140, a processor 150, and a clamping housing unit 160. ) And the communication unit 170. Fire risk measurement system 100 of the present embodiment monitors the temperature of the specified cable to manage the insulation of the cable to check the temperature rise due to internal or external causes, thereby preventing the fire caused by the cable in advance and the failure point It can provide an effect of judging. Hereinafter, the configuration of the fire risk measurement system 100 will be described in detail.

The memory 110 may store resistance value change data according to temperature change for each of the plurality of cables. The insulation surrounding the cable will decrease the insulation resistance as the temperature rises. However, there will be a difference in the temperature at which the insulation resistance sharply decreases according to the physical characteristics of the insulator. In the memory 110 of the fire risk measurement system 100, an insulation resistance value corresponding to a temperature change determined according to a type of cable measured in advance may be stored as the resistance value change data.

In one embodiment, a direct current (DC) voltage may be applied to the insulation ohmmeter to measure the insulation resistance. Specifically, a circular radiant heater can be used to raise the temperature of each cable uniformly in all directions. In addition, it is possible to implement a compartment surrounding the radiant heater to maintain the temperature to minimize the heat lost. The intensity of the radiant heater may control the temperature using the slidax, and measure the surface temperature of the cable and the internal temperature of the compartment using the K type thermocouple to generate resistance value change data to be stored in the memory 110.

The first sensor 120 may surround the outer surface of the designated cable and measure the surface temperature of the designated cable. In addition, the second sensor 130 may measure the external temperature of the designated cable. In exemplary embodiments, each of the first sensor 120 and the second sensor 130 may include a thermocouple (TC) for measuring a temperature of a designated cable.

The resistance measuring circuit 140 may measure the insulation resistance of the designated cable. For example, the resistance measuring circuit 140 may be implemented as an insulation ohmmeter for measuring the magnitude of the resistance value. Since the insulation resistance meter is straight-forward to the person skilled in the art, duplicate description will be omitted.

The processor 150 may calculate a difference between the surface temperature and the external temperature measured by each of the first sensor 120 and the second sensor 130. In addition, the processor 150 may compare the resistance change value data stored in the memory 110 with the measured insulation resistance value. The processor 150 may calculate a fire probability of the designated cable according to the calculated temperature difference and the comparison result. The process by which the fire probability is calculated by the processor 150 will be described in more detail with the drawings to be added below.

The clamping housing unit 160 may accommodate the first sensor 120 and the second sensor 130. The clamping housing unit 160 may support the first sensor 120 to be in contact with the designated cable. In addition, the clamping housing 160 may fasten the designated cable along a preset rotation direction.

When the measured insulation resistance value is smaller than the first threshold value according to the resistance change data stored in the memory 110, the communicator 170 may transmit a fire hazard message for the designated cable to the designated terminal. By way of example, a designated device represents a portable electronic device used by a user, the portable electronic device being a laptop computer, mobile phone, smart phone, tablet PC, mobile internet device (mobile) Internet device (MID), personal digital assistant (PDA), enterprise digital assistant (EDA), handheld console, e-book, or smart device. . For example, the smart device may be implemented as a smart watch or a smart band.

The communication unit 170 may transmit a fire danger message through a communication interface. The communication interface may include a wireless LAN (WLAN), a wireless fidelity (WiFi) direct, a digital living network alliance (DLNA), a wireless broadband (Wibro), a world interoperability for microwave access (Wimax), a high speed downlink packet access (HSDPA), and the like. Wireless Internet interfaces and short-range communication interfaces such as Bluetooth ™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, and Near Field Communication (NFC) have.

2A and 2B show resistance value change data according to a cable type stored in a memory. 2A and 2B show resistance value change data corresponding to each of different cable types. Specifically, the X axis of the graphs of FIGS. 2A and 2B may represent a temperature (° C.), and the Y axis may represent a resistance (TΩ). 2A may show resistance value change data of a TFR-8 cable as a first cable type. Also, FIG. 2B may show resistance value change data of the VCTF cable as the second cable type. Referring to FIG. 2A, the insulation resistance value of the first cable 211, the second cable 212, and the third cable 213 included in the first cable type starts to decrease at 160 ° C. as the temperature rises. On the contrary, referring to FIG. 2B, the insulation resistance values of the fourth cable 221, the fifth cable 222, and the third cable 223 included in the second cable type start to decrease at 20 ° C. FIG. The fire risk measurement system of this embodiment may store and manage a database of resistance value change data determined according to a cable type. Accordingly, the probability of fire can be calculated using the time point and the change width of the insulation resistance value with temperature corresponding to the cable type of the designated cable.

3A and 3B are exemplary views illustrating a clamping housing part fastened to a cable according to one embodiment. 3A and 3B, an embodiment of a clamping housing portion 320 that is fastened to a designated cable 310 is shown. The clamping housing part 320 may be implemented to be detachable and attached to the designated cable 310. In the following FIGS. 4A and 4B, the operation principle will be described in more detail through a cross-sectional view of the clamping housing part 320 described with reference to FIG. 3A.

4A and 4B are cross-sectional views illustrating the clamping housing portion described in FIG. 3A. 4A and 4B, the cranking housing part 430 measures the external temperature of the first sensor 421 measuring the surface temperature of the cable 410 designated at the inner side and the cable 410 designated at the outer side. A second sensor 422 to measure can be accommodated. The clamping housing part 430 may be rotated in a preset rotation direction such that the first sensor 421 contacts the designated cable 410 along the outer surface of the cable 410. In addition, the clamping housing part 430 may be fastened to the designated cable 410 along the rotation direction to operate the first sensor 421 to be in contact with the designated cable 410.

The clamping housing part 430 of the present embodiment may provide an effect of simply installing the clamp 410 even without separating the cable 410 itself. In addition, since the first sensor 421 and the second sensor 422 are implemented with thermocouples, the first sensor 421 and the second sensor 422 may be manufactured at low price due to low cost. The first sensor 421 measures the surface temperature of the cable 410 to confirm the degree of insulation deterioration and the fire risk due to the problem of the cable 410 itself. In addition, the second sensor 422 is installed on the outer surface of the cable 410, and calculates the degree of degradation of the insulation resistance by measuring the fire risk and the external temperature of the cable 410 due to external factors of the cable 410. .

5 is a cross-sectional view illustrating a clamping housing part fastened to a cable according to another embodiment. Referring to FIG. 5, a clamping housing part 530 according to another embodiment is shown. The clamping housing part 530 of the present exemplary embodiment may include a screw 541 for applying a force to bring the first sensor 521 into close contact with the designated cable 510 and a hole 542 for rotating the screw 541 through. Can be. The screw 541 may apply a force in a direction in which the first sensor 521 is in close contact with the cable 510. Accordingly, the first sensor 521 may measure the surface temperature of the cable 510 more accurately. The clamping housing part 530 of the present embodiment includes a screw 541 for applying a force to attach the cable 510 having a small cross-sectional area to the first sensor 521 to calculate the fire probability for the cable in various standards. Can provide.

6A and 6B are flowcharts illustrating a fire risk measuring method according to an exemplary embodiment. Referring to FIG. 6A, a fire hazard measurement method performed by a fire hazard measurement system is illustrated. The fire risk measuring method may include measuring a surface temperature and an external temperature of the cable 610, determining a temperature rise factor of the cable 620, and calculating a fire probability of the cable 630.

In step 610, the fire hazard measurement system may measure the surface temperature and the external temperature of the designated cable. Specifically, the thermocouple disposed on the inner side of the clamping housing portion can measure the surface temperature of the designated cable. In addition, a thermocouple disposed on the outer side of the clamping housing can measure the outside temperature of the designated cable.

In step 620, the fire risk measurement system may determine the temperature rise factor of the cable. Referring to FIG. 6B, after step 610 is performed, the fire hazard measurement system may perform step 621. In step 621 the fire hazard measurement system may compare whether the external temperature of the cable is greater than the surface temperature of the cable. In addition, the processor of the fire hazard measurement system may determine the temperature rise factor of the cable in steps 622 and 623. If greater than the outside temperature than the surface temperature, in step 622 the processor may determine that there is a temperature rise factor outside of the cable. In addition, when the surface temperature is greater than the external temperature, the processor may determine that there is a temperature increase factor in the cable at step 623. If the factors of temperature rise are determined in steps 622 and 623, the fire hazard measurement system may perform step 630.

In step 630, the fire hazard measurement system may calculate the fire probability of the cable. In one embodiment, when the measured insulation resistance value is less than the first threshold value according to the resistance value change data stored in the memory, the communication unit of the fire hazard measurement system may transmit a fire hazard message for the designated cable to the designated terminal. In another embodiment, the processor of the fire hazard measurement system may generate a fire hazard message for the designated cable if the rate of temperature rise of at least one of the surface temperature and the external temperature is above a second predetermined threshold. In addition, the processor may transmit a fire hazard message generated to the designated terminal through the communication unit. Through this process, the fire hazard measurement system can not only determine whether a problem has occurred inside or outside the cable, but also determine the degree of reduction in insulation resistance to reduce the risk of fire of the cable due to short circuit and ground fault.

7 is an exemplary view illustrating a process of generating a fire hazard message by a fire hazard measurement system according to another exemplary embodiment. Referring to FIG. 7, a process in which the fire hazard measurement system 700 including the first sensor 711 and the second sensor 712 interlocks with the fire receiving panel 730 will be described. In smoke and heat detection used today for fire detection, there is a difficulty in detecting fires by cables early. Specifically, the smoke and heat detectors used today are not directly attached to the cable but are spaced apart. In the case of smoke detection, the reaction rate is faster than that of the heat detector. However, since the temperature of the point where smoke occurs through pyrolysis of the cable sheath is approximately 170 ° C. or more and 180 ° C. or less, it is physically impossible to detect and alarm a fire accident early due to the heating of the cable itself. The fire risk measurement system of this embodiment is directly attached to the cable, it can be expected to measure the internal and external temperature of the cable in real time, and to prevent the fire accident caused by the cable in advance. In addition, the fire risk measurement system 700 operates in conjunction with the fire receiving panel 730 has the advantage of monitoring the cable fire in real time without the addition of additional equipment.

The surface temperature and the external temperature of the cable measured by the first sensor 711 and the second sensor 712 are amplified by the amplifier / comparator 720, and the designated data server 740 after converting the analog signal into a digital signal. Storage can be managed. Specifically, the sudden temperature rise detected by the second sensor 712 is determined to be a fire risk due to an external factor of the cable, and the sudden temperature rise detected by the first sensor 711 is a fire caused by an internal factor of the cable. It can be considered a risk. The fire risk measurement system passes the amplification / comparator 720 for instantaneous operation and is compared with a reference signal. When the magnitude of the reference signal is exceeded, the fire hazard measurement system outputs a signal for fire interlocking of the fire receiver 730. do.

)이 초당 3℃ 이상 상승한 경우 주의 신호, 초당 5℃ 이상 상승하기 되면 위험 신호, 초당 10℃ 이상 상승하게 되면, 내부 또는 외부에서의 온도 상승인지를 구분하여 화재 경보를 발생시킬 수 있다. 앞서 기재한 온도 상승률에 대한 예시를 이해를 돕기 위한 예시적 수치일 뿐, 기술 분야의 전문가에 의한 다양한 변경이 가능할 것이다.Specifically, the processor of the fire hazard measurement system 700 includes a rate of temperature rise of at least one of the surface temperature and the external temperature.

) Is higher than 3 ℃ per second, warning signal, if it rises above 5 ℃ per second, danger signal, if it rises above 10 ℃ per second, fire alarm can be generated by distinguishing whether temperature is rising from inside or outside. It is merely exemplary values to help understand the examples of the rate of temperature rise described above, and various modifications may be made by those skilled in the art.

In addition, the fire risk measurement system 700 is a magnitude of a reference signal for instantaneous operation as a warning signal when at least one of the surface temperature and the external temperature rises above 40 ° C, a danger signal when rises above 70 ° C, and rises above 100 ° C. Can cause a fire alarm. The size of the reference signal described above may also be variously changed depending on the season and the place where the cable is installed.

8 is an exemplary view illustrating a process of verifying the validity of a fire danger message by a fire risk measurement system through a sensor network according to another embodiment. The fire hazard measurement system 800 may verify the validity of the fire hazard message within the sensor network 820, 830, 840 connected to the plurality of power generators 811, 812, 813. Cables are used in open or enclosed spaces with lengths of several meters to several kilometers, depending on where they are installed. In the case of a cable buried underground, it is difficult to determine the exact point of failure when a failure such as insulation breakdown occurs in the cable due to internal or external factors. The fire risk measurement system 800 according to the present exemplary embodiment may determine the fire risk according to whether the insulation resistance decreases with temperature by using the first sensor and the second sensor. Accordingly, the fire risk measurement system 800 may provide an effect of accurately detecting a cable accident point due to a hot spot to increase the efficiency of the repair step after a failure.

In one embodiment, the communication unit of the fire risk measurement system 800 may receive a temperature increase rate measured by another terminal existing in the predefined sensor network (820, 830, 840). The fire risk measurement system 800 may accurately calculate the risk of insulation breakdown based on temperature data for each section received from the sensor networks 820, 830, and 840.

In this case, the processor of the fire hazard measurement system 800 may verify the validity of the fire hazard message by comparing the temperature rise rate measured by the other terminal with the temperature rise rate of at least one of the surface temperature and the external temperature. . For example, the fire risk measurement system 800 may compare the measured surface temperature and the external temperature with temperature data of other sensors installed on the left and right sides of the sensor. In the case of the temperature rise due to the problem inside the cable, if the overcurrent or fault current is energized due to the failure except the problem due to local heating, the same current flows through the cable and the temperature rises as a whole. That is, the error can be minimized by comparing the temperature change between the sensors installed on the left and right sides of the sensor.

In addition, the processor may compare the temperature rise rate measured by each of the plurality of terminals existing in the sensor network, and determine a failure section based on the position of the terminal indicating the highest temperature rise rate.

As another example, the memory of the fire hazard measurement system 800 may store the surface temperature and the external temperature measured over time for the designated cable. In this case, the processor may validate the fire hazard message based on the surface temperature and the external temperature stored in the memory. Temperature data measured from the sensors of the fire risk measurement system 800 may be stored in the data server, and may be selected and used in combination with instantaneous operation and time delay according to the application location of the sensor and the administrator's judgment. . Accordingly, the fire risk measurement system 800 may determine heat generation due to an error and an instantaneous fault current when the temperature rise within 10 sec and the temperature of the initial state are reduced based on the temperature data stored in the data server. If the heating is repeated more than the specified threshold number of times, the fire risk measurement system 800 may transmit a fire alarm message to the designated terminal.

Cables are installed in the range of several m to several km. In case of damage to the cable due to short circuit and ground fault, there may be technical difficulties in accurately detecting the point of failure. Specifically, if a short circuit or ground fault occurs, currents of hundreds [A] to thousands [A] flow depending on the location of the failure point, and thus the cable generates Joule heat and causes a temperature rise. In this case, since the temperature rise does not occur after the failure point, the fire hazard measurement system 800 reduces the failure section to confirm the failure section more quickly, and maintenance becomes possible.

As another example, the communication unit of the fire hazard measurement system 800 may receive weather data for the location of the designated cable. In the case of cables installed in underground power outlets and enclosed spaces, temperature changes in the interior space occur depending on weather conditions. In this case, the processor may calculate a correction factor for correcting the temperature increase rate of at least one of the surface temperature and the external temperature using the received weather data. The correction coefficient is determined according to the abnormal voltage value due to lightning introduced into the designated cable.

The embodiments described above may be implemented as hardware components, software components, and / or combinations of hardware components and software components. For example, the devices, methods, and components described in the embodiments may include, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors, microcomputers, field programmable gates (FPGAs). It may be implemented using one or more general purpose or special purpose computers, such as an array, a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to the execution of the software. For convenience of explanation, one processing device may be described as being used, but one of ordinary skill in the art will appreciate that the processing device includes a plurality of processing elements and / or a plurality of types of processing elements. It can be seen that it may include. For example, the processing device may include a plurality of processors or one processor and one controller. In addition, other processing configurations are possible, such as parallel processors.

The software may include a computer program, code, instructions, or a combination of one or more of the above, and configure the processing device to operate as desired, or process it independently or collectively. You can command the device. Software and / or data may be any type of machine, component, physical device, virtual equipment, computer storage medium or device in order to be interpreted by or to provide instructions or data to the processing device. Or may be permanently or temporarily embodied in a signal wave to be transmitted. The software may be distributed over networked computer systems so that they may be stored or executed in a distributed manner. Software and data may be stored on one or more computer readable recording media.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. Computer-readable media may include, alone or in combination with the program instructions, data files, data structures, and the like. Program instructions recorded on the computer readable medium may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

Although the embodiments have been described with reference to the accompanying drawings, those skilled in the art may apply various technical modifications and variations based on the above. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Claims (10)

A memory for storing resistance value change data according to temperature change for each of the plurality of cables;
A first sensor surrounding an outer surface of a designated cable and measuring a surface temperature of the designated cable;
A second sensor for measuring an external temperature of the designated cable;
A resistance measuring circuit for measuring an insulation resistance value of the designated cable; And
Calculate the difference between the surface temperature and the external temperature, compare the resistance value change data stored in the memory with the measured insulation resistance value, and calculate the probability of fire of the designated cable according to the calculated temperature difference and the comparison result Processor
Fire risk measurement system comprising a.
The method of claim 1,
The processor determines that a factor of temperature rise of the cable exists inside the designated cable when the surface temperature is greater than the external temperature, and determines that the external temperature of the cable is greater than the surface temperature. A fire hazard measurement system that determines that a factor of temperature rise is outside of the specified cable.
The method of claim 1,
A clamping housing part for accommodating the first sensor and the second sensor, supporting the first sensor to contact the designated cable along the outer surface, and fastening the designated cable along a preset rotational direction.
Fire risk measurement system further comprising.
The method of claim 3,
The clamping housing part,
A screw for applying a force to bring the first sensor into close contact with the designated cable; And
Hole through which the screw rotates
Fire risk measurement system comprising a.
The method of claim 1,
When the measured insulation resistance value is less than the first threshold value according to the resistance value change data stored in the memory, the communication unit for transmitting a fire risk message for the designated cable to the designated terminal
Fire risk measurement system further comprising.
The method of claim 5,
The processor generates a fire hazard message for the designated cable when the rate of temperature rise of at least one of the surface temperature and the external temperature is greater than or equal to a preset second threshold, and generates the generated fire to the designated terminal through the communication unit. Fire hazard measurement system that transmits danger messages.
The method of claim 6,
The communication unit receives a temperature increase rate measured by another terminal existing in a predefined sensor network,
The processor compares the temperature rise rate measured by the other terminal with the temperature rise rate of at least one of the surface temperature and the external temperature to verify the validity of the fire risk message.
The method of claim 7, wherein
The processor determines a failure interval based on the position of the terminal indicating the highest temperature increase rate by comparing the temperature rise rate measured by each of the plurality of terminals present in the sensor network.
The method of claim 7, wherein
The memory stores the measured surface temperature and external temperature over time for the designated cable,
And the processor validates the fire hazard message based on a surface temperature and an external temperature stored in the memory.
The method of claim 7, wherein
The communication unit receives weather data for the location of the designated cable, the processor calculates a correction factor for correcting the temperature increase rate of at least one of the surface temperature and the external temperature using the received weather data, And the correction factor is determined in accordance with an abnormal voltage value due to lightning introduced into the designated cable.

Images