Method and system for locating early fire in power equipment based on space-time array sampling

Abstract

The present invention discloses a method and system for locating early-stage fires of power equipment based on space-time array sampling, including: dividing monitoring points according to the spatial distribution of power equipment in the monitoring area; arranging air sampling tubes and corresponding electronic valves at each monitoring point; obtaining the detection time of each monitoring point according to the air sampling time of the monitoring point, the analysis time of the sampled air, and the delay time after the early warning is issued; determining the opening and closing time of the corresponding electronic valve and the opening and closing interval time between the electronic valves according to the detection time of each monitoring point, so as to sample each monitoring point in chronological order, and locate the monitoring point with early-stage fire risk according to the analysis results of the sampled air. By arranging the monitoring area in space and controlling the sampling time interval in time according to the electronic valve, targeted data analysis is carried out, and early-stage fire risk source positioning is achieved by a multi-partition, array-type detection and identification method.

Description

Technical Field

[0001] The present invention relates to the technical field of early-stage fire identification, and in particular to an early-stage fire locating method and system for electric power equipment based on space-time array sampling. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The relatively closed spaces of power transmission and transformation equipment mainly include cable layers, cable corridors, high and low voltage switch cabinets and various equipment rooms. These spaces are narrow and densely populated with power equipment. Long-term operation is prone to equipment aging, increased contact point resistance, local heating, etc., which increases the risk of fire. Power equipment will have some early signs before a fire occurs, such as frequent arcs, sparks, and even overheating and smoldering of cables, so early fire monitoring and early warning are needed.

[0004] At present, when conducting early fire detection in relatively closed spaces of power transmission and transformation equipment, aspirated smoke detection and aspirated pyrolytic particle detection are mainly used, both of which use air sampling pipes for sampling; an air sampling pipe is a pipe with one or more branches. A long-distance air sampling pipe runs through multiple equipment distribution areas or multiple equipment rooms, and all the air along the way is sampled through the sampling holes on the pipe body, and the air on its path is extracted to the detector end for analysis and identification; the difference is that smoke detection identifies visible smoke, and pyrolytic particle detection identifies invisible pyrolytic particles and visible smoke. Both methods can identify and locate fire risks in a large monitoring area, but can only determine a certain area, and cannot locate a specific location or certain equipment.

[0005] Smoke and temperature detection in traditional fire protection measures mainly monitor visible smoke and ambient temperature, and distinguish different spatial locations by distributing detectors at certain intervals. According to fire protection regulations, each detector has a fixed detection area. When a fire alarm occurs, the fire source is located through its fixed code. Although traditional smoke and temperature detection uses regional settings to achieve fire location within a certain range, it is difficult to identify the early fire risks of power equipment. At the same time, these measures use passive detection methods, which can only work when smoke, light and heat reach the detector. The efficiency is low, and it is often difficult to deploy in small spaces (such as cable trenches, shafts, switch cabinets, etc.), and the scope of application is limited.

[0006] Traditional temperature measurement optical fiber adopts contact temperature measurement method, which means the optical fiber is wrapped around the object to be measured, and the temperature is measured after the contact surface is formed. The temperature measurement optical fiber can locate the abnormal heating position through the controller. However, the optical fiber needs to be attached to the equipment, and the position that cannot be contacted cannot be identified. Therefore, in actual application, optical fiber temperature measurement is generally not deployed over a large area; and it is easy to have intermediate faults and module faults, which is easy to fail and affect the actual use effect.

[0007] Thermal imaging technology uses infrared detectors to receive infrared radiation energy from the target to form an infrared thermal image. However, infrared detectors need to be installed in fixed positions and fixed areas, and the detection objects are limited to a certain angle, distance and range. They cannot fully cover multiple areas and multiple power equipment. If there is occlusion, overlap, closed space, or irregular space, the recognition effect will be affected. Summary of the invention

[0008] In order to solve the above problems, the present invention proposes a method and system for early fire positioning of power equipment based on space-time array sampling. The monitoring area is partitioned in space, and the sampling time interval is controlled by electronic valves in time to perform targeted data analysis. The early positioning of fire sources is achieved by a multi-partition, array-based detection and identification method.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] In a first aspect, the present invention provides a method for locating an early fire of electric power equipment based on space-time array sampling, comprising:

[0011] Divide monitoring points according to the spatial distribution of power equipment within the monitoring area;

[0012] An air sampling tube and a corresponding electronic valve are arranged at each monitoring point to control the on and off of the air flow in the air sampling tube through the electronic valve;

[0013] The detection time of each monitoring point is obtained according to the air sampling time of the monitoring point, the analysis time of the sampled air and the delay time after the warning is issued;

[0014] The opening and closing time of the corresponding electronic valve and the opening and closing interval time between the electronic valves are determined according to the detection time of each monitoring point, so that each monitoring point is sampled in chronological order, and the monitoring points with early fire risks are located according to the sampling air analysis results.

[0015] As an optional embodiment, the air sampling time is the time from air inhalation to air transmission to the detector through the air sampling tube.

[0016] As an optional implementation, the air sampling time is determined according to the sampling distance and the air flow velocity.

[0017] As an optional implementation, the analysis time of the sampled air is the time from when the detector receives the air, analyzes and identifies the particle concentration value, and issues an early warning.

[0018] As an optional implementation method, the delay time after the warning is issued can be customized.

[0019] As an optional implementation, the detection time of the monitoring point is the sum of the air sampling time, the analysis time of the sampled air and the delay time after the warning is issued.

[0020] As an optional implementation, the opening and closing interval of the electronic valve is: in, Refers to the sum of the detection times of n monitoring points; t i Refers to the detection time of the ith monitoring point.

[0021] As an optional implementation, two adjacent electronic valves are opened and closed in sequence and the opening and closing times do not overlap.

[0022] As an optional implementation, an air sampling tube is arranged above each monitoring point, an electronic valve is provided on the air sampling tube, and a sampling hole is provided on the air sampling tube at the rear end of the electronic valve.

[0023] In a second aspect, the present invention provides an early fire location system for power equipment based on space-time array sampling, comprising: an air sampling tube, an electronic valve and a control module;

[0024] The air sampling tube is arranged at each monitoring point, and an electronic valve is arranged at the air sampling tube corresponding to each monitoring point to control the on and off of the airflow in the air sampling tube through the electronic valve; the monitoring points are multiple monitoring points divided according to the spatial distribution of the power equipment in the monitoring area;

[0025] The control module obtains the detection time of each monitoring point according to the air sampling time of the monitoring point, the analysis time of the sampled air and the delay time after the early warning is issued; and determines the opening and closing time of the corresponding electronic valve and the opening and closing interval time between the electronic valves according to the detection time of each monitoring point, so as to control the opening and closing of the electronic valve in chronological order, realize sampling of each monitoring point in turn, and locate the monitoring point with early fire risk according to the analysis results of the sampled air.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention proposes a method and system for locating early fires in power equipment based on space-time array sampling. The monitoring area is spatially partitioned and the sampling time interval is controlled by an electronic valve to perform targeted data analysis, thereby realizing early positioning of fire hazard sources by a multi-partition, array-based detection and identification method.

[0028] The present invention proposes a method and system for locating early fires in power equipment based on space-time array sampling. According to the fire monitoring needs of power equipment in relatively closed spaces, different monitoring points are divided on the air sampling pipeline, and an electronic valve that can be remotely controlled by the network is set on the air sampling pipe of each monitoring point. Each monitoring point can control the on and off of its airflow through the timed opening and closing of the electronic valve, and air sampling, identification analysis and early warning are performed on all monitoring points in a space-time array mode, thereby achieving the purpose of fire risk positioning by distinguishing the source of air samples.

[0029] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0031] Figure 1 A flow chart of a method for locating an early fire in electric power equipment based on space-time array sampling provided in Example 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the equipment installation provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0037] Example 1

[0038] This embodiment provides a method for locating an early fire of electric power equipment based on space-time array sampling, including:

[0039] Divide monitoring points according to the spatial distribution of power equipment within the monitoring area;

[0040] An air sampling tube and a corresponding electronic valve are arranged at each monitoring point to control the on and off of the air flow in the air sampling tube through the electronic valve;

[0041] The detection time of each monitoring point is obtained according to the air sampling time of the monitoring point, the analysis time of the sampled air and the delay time after the warning is issued;

[0042] The opening and closing time of the corresponding electronic valve and the opening and closing interval time between the electronic valves are determined according to the detection time of each monitoring point, so that each monitoring point is sampled in chronological order, and the monitoring points with early fire risks are located according to the sampling air analysis results.

[0043] In this embodiment, if Figure 1 As shown, the monitoring points are divided according to the spatial distribution of power equipment in the monitoring area and combined with the fire warning requirements; specifically:

[0044] Since the area monitored by each sampling point on the sampling tube is approximately 3m×3m, the monitoring area where the power equipment is distributed can be divided into multiple 3m×3m monitoring points, such as one area, one device or several devices, and each monitoring point is numbered, and each monitoring point is located on the path of the air sampling tube.

[0045] For equipment rooms such as the main transformer room and the distribution room, the monitoring points are divided according to the spatial location of the equipment, and according to the layout path of the air sampling tube, the sampling point of each air sampling tube covers a monitoring point.

[0046] For long-distance cable trays, due to the narrow space, monitoring points can be divided at intervals of 3 to 5 meters.

[0047] For the monitoring of high-voltage switchgear, it is necessary to divide the monitoring points according to the arrangement of the cabinets, and define 1 to 4 groups of switchgear as one monitoring point. In addition, due to the closed nature of the switchgear, the diffusion of internal fire pyrolysis particles and smoke is blocked, so a capillary sampling tube can be used to probe into the switchgear for direct air sampling.

[0048] In this embodiment, an air sampling tube and a corresponding electronic valve are arranged at each monitoring point to control the on / off of the airflow in the air sampling tube through the electronic valve; then, through the installation and arrangement of the air sampling tube, detectors, electronic valves and transmission network, coverage of the monitoring area and physical division of the monitoring points are formed, thereby constructing the spatial array basis for spatial sampling.

[0049] In this embodiment, an air sampling tube is arranged above each monitoring point according to the designated monitoring points, an electronic valve is set on the sampling tube in the middle of the monitoring point, the air sampling tube is connected to the electronic valve, a sampling hole with an aperture of 3 mm is set on the air sampling tube, and the on and off of the sampling airflow is controlled by opening and closing the electronic valve to perform directional air sampling.

[0050] In addition, detectors, power boxes, network control boxes, etc. are installed on the wall for easy viewing. Power lines / data lines are led out from each electronic valve end and laid to the power box and network control box to connect the power supply and gateway. The signals of each electronic valve are uploaded to the monitoring host through the gateway to establish an IoT sensor network for air sampling and monitoring control.

[0051] In this embodiment, by calculating and experimentally verifying the detection time of sampling at each monitoring point, the detection time of sampling at each monitoring point under certain air flow velocity conditions is determined, forming a time array basis for air sampling and data analysis.

[0052] The detection time of the monitoring point includes: air sampling time t1, analysis time t2 of sampled air, and delay time t3 after the warning is issued; specifically:

[0053] (1) The air sampling time is the time it takes for the air sample to be inhaled from the sampling point and transmitted to the detector through the air sampling tube. Due to the differences in the distance and path of each sampling point from the detector, the time it takes for the sampled airflow to reach the detector through the sampling tube is also different. Therefore, according to the sampling distance of the sampling point and the sampling airflow velocity, the air sampling time is: t1 = L / v, where t1 is the air sampling time, in seconds; L is the sampling distance, in meters; and v is the airflow velocity, in meters / s.

[0054] (2) The analysis time of sampled air is the time from when the detector receives the air sample, analyzes it, identifies the particle concentration value and issues an early warning. This time is relatively stable for fixed-model detectors and can be obtained by fire simulation tests: t2 = a, unit s (seconds).

[0055] (3) Delay time after the warning is issued; after the detector issues a warning, further confirmation of the warning situation is required, so there must be an appropriate delay time b, unit s (seconds), which is set to t3 = 10 in this embodiment.

[0056] In summary, the detection time t of monitoring point n n is: t n =t1+t2+t3=L / v+a+b.

[0057] During the test verification, first set the sampling airflow speed of the detector, so that the electronic valve of the monitoring point to be tested is in the open state, and other electronic valves are in the closed state, so that the air flow can only enter from the air sampling tube where the specific monitoring point is located. At this time, release the arc or smoke at the measuring point, test and record the time required for the entire process from the sampling point to the arc or smoke being sucked in, to the detector end sending out the warning signal, and then confirming the warning delay, and compare it with the calculated detection time. If there is an error, take the average value after multiple tests; complete the confirmation of the detection time of all monitoring points in turn.

[0058] In this embodiment, according to the detection time of each monitoring point, the opening and closing interval of each electronic valve is set in sequence, and sampling, analysis and early warning are performed in chronological order to form a fire location and identification mechanism of space-time array sampling.

[0059] The opening and closing interval of the electronic valve is:

[0060] in, Refers to the sum of the detection times of n monitoring points.

[0061] This formula is used to calculate the interval time from the 1st monitoring point to the nth monitoring point. After calculation, the interval time of the 1st monitoring point is 0, the 2nd monitoring point is t1, the 3rd monitoring point is t1+t2, and so on.

[0062] The opening and closing interval of the electronic valve at each monitoring point is obtained according to the detection time of each monitoring point, so that two adjacent electronic valves can be opened and closed successively without affecting each other, thereby realizing the setting of the consecutive opening and closing time of all electronic valves, forming space-time array positioning and early warning.

[0063] In this embodiment, an independent data storage table is set for each monitoring point, and the detection and analysis data thereof are stored according to number and time.

[0064] In this embodiment, the number of the monitoring point, the number of the electronic valve and the analysis result of the sampled air are matched. When a fire warning occurs, it is directly matched to the number of the monitoring point with risk and its corresponding spatial position to achieve fire risk positioning.

[0065] In this embodiment, in the absence of an early warning, all electronic valves are in an open state, air sampling is performed from each monitoring point, and the detector analyzes the fire risk of all monitoring areas. When a fire early warning appears at the detector end and lasts for a certain period of time (such as 60 seconds), the space-time array analysis mode of the electronic valve is started, and the program automatically controls each sampling point to perform air sampling to check the source of the fire risk.

[0066] Example 2

[0067] like Figure 2 As shown, this embodiment provides an early fire location system for power equipment based on space-time array sampling, including: an air sampling tube, an electronic valve and a control module;

[0068] The air sampling tube is arranged at each monitoring point, and an electronic valve is arranged at the air sampling tube corresponding to each monitoring point to control the on and off of the airflow in the air sampling tube through the electronic valve; the monitoring points are multiple monitoring points divided according to the spatial distribution of the power equipment in the monitoring area;

[0069] The control module obtains the detection time of each monitoring point according to the air sampling time of the monitoring point, the analysis time of the sampled air and the delay time after the early warning is issued; and determines the opening and closing time of the corresponding electronic valve and the opening and closing interval time between the electronic valves according to the detection time of each monitoring point, so as to control the opening and closing of the electronic valve in chronological order, realize sampling of each monitoring point in turn, and locate the monitoring point with early fire risk according to the analysis results of the sampled air.

[0070] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A method for locating early fires in power equipment based on space-time array sampling, characterized in that: include: Divide monitoring points according to the spatial distribution of power equipment within the monitoring area; An air sampling tube and a corresponding electronic valve are arranged at each monitoring point to control the on and off of the air flow in the air sampling tube through the electronic valve; Determine the air sampling time based on the sampling distance and air flow velocity; The detection time of each monitoring point is obtained according to the air sampling time of the monitoring point, the analysis time of the sampled air and the delay time after the warning is issued; According to the detection time of each monitoring point, the opening and closing time of the corresponding electronic valve and the opening and closing interval time between the electronic valves are determined, so as to sample each monitoring point in chronological order, and locate the monitoring point with early fire risk according to the analysis results of the sampled air; the analysis time of the sampled air is the time from the detector receiving the air, analyzing and identifying the particle concentration value and issuing an early warning; the detection time of the monitoring point is the sum of the air sampling time, the analysis time of the sampled air and the delay time after the early warning is issued; After the detector issues an early warning, further confirmation of the early warning situation is required, so there should be an appropriate delay time b, unit s; The opening and closing interval of the electronic valve is: ;in, refer to n The sum of the detection times of the monitoring points; Refers to i The detection time of each monitoring point; Two adjacent electronic valves are opened and closed in sequence and the opening and closing times do not overlap.

2. The method for locating early fires in power equipment based on space-time array sampling according to claim 1, characterized in that: The air sampling time is the time from when air is inhaled to when it is transmitted through the air sampling tube to the detector.

3. The method for locating early fires in power equipment based on space-time array sampling according to claim 1, characterized in that: The delay time after the warning is issued can be customized.

4. The method for locating early fires in power equipment based on space-time array sampling according to claim 1, characterized in that: An air sampling tube is arranged above each monitoring point, an electronic valve is arranged on the air sampling tube in the middle of the monitoring point, the electronic valve is connected to the air sampling tube, and a sampling hole is arranged on the air sampling tube.

5. A system for locating power equipment early fires by space-time array sampling using the method for locating power equipment early fires by space-time array sampling as claimed in claim 1, characterized in that: include: Air sampling tubes, electronic valves and control modules; The air sampling tube is arranged at each monitoring point, and an electronic valve is arranged at the air sampling tube corresponding to each monitoring point to control the on and off of the airflow in the air sampling tube through the electronic valve; the monitoring points are multiple monitoring points divided according to the spatial distribution of the power equipment in the monitoring area; The control module obtains the detection time of each monitoring point according to the air sampling time of the monitoring point, the analysis time of the sampled air and the delay time after the warning is issued; The opening and closing time of the corresponding electronic valve and the opening and closing interval time between the electronic valves are determined according to the detection time of each monitoring point, so as to control the opening and closing of the electronic valves in chronological order, sample each monitoring point in turn, and locate the monitoring points with early fire risks according to the sampling air analysis results.

Images