Method and system for detecting occupational exposure level of power frequency electric field of overhead transmission and distribution line

Abstract

The application discloses an overhead power transmission and distribution line power frequency electric field occupational exposure level detection method and system, comprising the following steps: selecting an overhead line span, and arranging and controlling the overhead line detection points by taking the middle point of the overhead line span as a starting detection point; acquiring the power frequency electric field intensity of the overhead line detection points in a patrol inspection time period; and determining the occupational exposure level according to the power frequency electric field intensity. The method realizes the acquisition of the power frequency electromagnetic field exposure level of workers in the working positions in the power transmission and distribution line scene, and has good pertinence and applicability in the power transmission and distribution line scene.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection of occupational hazards, in particular to a method and system for detecting occupational exposure level of power frequency electric field of overhead power transmission and distribution lines. BACKGROUND

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

[0003] Power transmission lines refer to lines that transmit electric energy from power plants to power load centers and tie lines between power systems. Distribution lines refer to lines that deliver power from step-down substations to distribution transformers, or deliver power from distribution substations to power users. Occupational hazards refer to various hazards that may cause occupational diseases to laborers engaged in occupational activities. Occupational hazard detection refers to obtaining the level (concentration or intensity) of occupational hazard factors to which laborers at a work post are exposed in a working day (8 hours).

[0004] In actual work, power transmission and distribution lines generally need to be regularly inspected by laborers to promptly eliminate various faults and ensure safe operation of the lines. During the process of laborers engaged in power transmission and distribution line inspection, they may be exposed to occupational hazards such as power frequency electric field and power frequency magnetic field generated by power transmission and distribution lines.

[0005] Currently, there are two methods for detecting power frequency electromagnetic field:

[0006] Method 1 is “Measurement of Physical Agents in the Workplace - Part 3: 1 Hz to 100 kHz Electric and Magnetic Fields” (GBZT189.3-2018), which specifies the measurement method of 1 Hz to 100 kHz electric and magnetic fields in the workplace;

[0007] Method 2 is “Technical Code for Labor Environment Monitoring in Electric Power Industry - Part 7: Monitoring of Power Frequency Electric and Magnetic Fields” (DL / T 799.7-2019), which specifies the detection content, detection instrument, detection method, detection point setting, detection result calculation, and detection result evaluation of power frequency electric and magnetic field monitoring in the workplace of the electric power industry.

[0008] However, method 1 does not mention the detection method of power frequency electric and magnetic field of power transmission and distribution lines. Although method 2 mentions “according to the operation mode of line inspection personnel, 1 measuring point is set at the inspection passage closest to the lowest position of the central sag of the span of overhead lines, and different types of towers and conductor arrangements are detected”, but it does not make further detailed provisions.

[0009] Due to the long distance of power transmission line, the winding path, etc., the working post laborers are not fixed at the inspection operation site, and the operation range is particularly large, and even can be throughout the county, and the existing public occupational hazards detection method does not have good pertinence and applicability in the power transmission line scene. SUMMARY

[0010] In order to solve the above problems, the present application provides a kind of overhead power transmission line power frequency electric field occupational exposure level detection method and system, realize the acquisition of the power frequency electromagnetic field exposure level of working post laborers in the power transmission line scene, and have good pertinence and applicability in the power transmission line scene.

[0011] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0012] Firstly, the present application provides an overhead power transmission line power frequency electric field occupational exposure level detection method, comprising:

[0013] Select overhead line span, and take the middle point of overhead line span as the starting detection point to arrange and control overhead line detection point;

[0014] Obtain the power frequency electric field intensity of overhead line detection point in the inspection time period;

[0015] Determine occupational exposure level according to power frequency electric field intensity.

[0016] As an optional implementation, the selection of overhead line span specifically includes: sequentially screening according to conductor arrangement mode, tower type, voltage grade and set span two side environment principle.

[0017] As an optional implementation, the arrangement and control process of overhead line detection point includes: from the starting detection point, according to the set interval, point is arranged in turn along the vertical line direction, until the specified distance is reached, and the measurement end point is determined.

[0018] As an optional implementation, the overhead line span is two towers plus a middle line segment as 1 span.

[0019] As an optional implementation, the middle point of the overhead line span is the middle point of the tower connecting line.

[0020] As an optional implementation, the process of obtaining power frequency electric field intensity includes: using three-axis measuring instrument for fixed point measurement, setting the erection height of three-axis measuring instrument measurement probe and the distance between measurement personnel and measurement probe, under the condition that the environment meets the requirements, each overhead line detection point is measured multiple times and the average value is taken, and all selected overhead line spans are measured in turn.

[0021] As an alternative embodiment, the occupational exposure level E determined according to the power frequency electric field intensity is:

[0022]

[0023] In the formula, t is the length of a working day; T is the average value of the inspection time within a working day; E i is the power frequency electric field intensity; and n is the number of measurement points.

[0024] In a second aspect, the present application provides an overhead transmission and distribution line power frequency electric field occupational exposure level detection system, comprising:

[0025] The detection point arrangement module is configured to select an overhead line span, and arrange and control the overhead line detection points by taking the middle point of the overhead line span as a starting detection point.

[0026] The data acquisition module is configured to acquire the power frequency electric field intensity of the overhead line detection points within the inspection time period.

[0027] The occupational exposure level determination module is configured to determine the occupational exposure level according to the power frequency electric field intensity.

[0028] In a third aspect, the present application provides an electronic device, comprising a memory and a processor, and computer instructions stored in the memory and running on the processor, when the computer instructions are run by the processor, the method of the first aspect is completed.

[0029] In a fourth aspect, the present application provides a computer readable storage medium for storing computer instructions, when the computer instructions are executed by a processor, the method of the first aspect is completed.

[0030] Compared with the prior art, the present application has the following beneficial effects:

[0031] The present application provides an overhead transmission and distribution line power frequency electric field occupational exposure level detection method and system, which selects an overhead line span according to the conductor arrangement mode, tower type, voltage grade and the principle of setting the environment on both sides of the span, takes the middle point of the overhead line span as a starting detection point, arranges points according to the set distance along the vertical line direction from the starting detection point until a specified distance is reached to determine the measurement endpoint, thereby realizing the arrangement and control of the overhead line detection points, acquiring the power frequency electric field intensity of the overhead line detection points within the inspection time period to determine the overhead transmission and distribution line power frequency electric field occupational exposure level, solving the influence of the long transmission distance, the zigzag path, the non-fixed inspection operation site and the large operation range of the transmission and distribution line on the occupational hazard factor detection, realizing the acquisition of the power frequency electromagnetic field exposure level of the workers at the working post in the transmission and distribution line scene, and having good pertinence and applicability in the transmission and distribution line scene.

[0032] Advantages of the additional aspects of the application will become apparent in the following description. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the application and together with the description serve to explain the application.

[0034] Figure 1 A flow chart of a method for detecting occupational exposure level of power frequency electric field of overhead power transmission and distribution line is provided for embodiment 1 of the application;

[0035] Figure 2 A schematic diagram of an example line is provided for embodiment 1 of the application;

[0036] Figure 3 A schematic diagram of point detection of overhead line is provided for embodiment 1 of the application. DETAILED DESCRIPTION

[0037] The application will be further described with reference to the drawings and the following examples.

[0038] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, 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 application belongs.

[0039] It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, as the scope of the application will be limited only by the appended claims. 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 application belongs. Unless otherwise required by context, singular terms shall include pluralities and vice versa. Plural elements can be separated by a hyphenated form of the element name, for example, "multiple elements". Singular terms shall include pluralities except where otherwise evident by context. Singular terms shall include pluralities and vice versa as well, unless otherwise explicit by context. The terms "comprises", "comprising", "includes", "including" and "contains", "containing" as used herein are specifically intended to be open-ended terms i.e., to mean including, but not limited to, to provide for the presence of stated features, integers, steps or components.

[0040] The embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0041] Embodiment 1

[0042] The application provides a method for detecting occupational exposure level of power frequency electric field of overhead power transmission and distribution line, as shown in the following formula (I): Figure 1 The method comprises the following steps:

[0043] Select the span of overhead line, and take the middle point of the overhead line span as the starting detection point to arrange and control the detection points of the overhead line.

[0044] Obtain the power frequency electric field intensity of the overhead line detection point in the inspection period.

[0045] Determine the occupational exposure level according to the power frequency electric field intensity.

[0046] In this embodiment, as shown in the figure Figure 2 is a schematic diagram of a certain section of the line, wherein: Z represents a straight line tower, N represents a strain tower, J represents a corner tower, H represents a transposition tower, G represents a terminal tower, A represents a single circuit on the same tower, B represents a double circuit on the same tower, C represents a three-circuit on the same tower, D represents a four-circuit on the same tower, E represents a five-circuit on the same tower, and F represents a six-circuit on the same tower.

[0047] Let the two towers plus the middle line segment be one span, and let the number of spans of a section of line be N. Then, the selection of the overhead line span specifically includes:

[0048] (1) Selection according to the arrangement of the conductor;

[0049] For example: there are N1 single circuits on the same tower, N2 double circuits on the same tower, N3 three circuits on the same tower, N4 four circuits on the same tower, N5 five circuits on the same tower, and N6 six circuits on the same tower.

[0050] (2) Selection according to the tower type based on (1);

[0051] For example: taking the double circuit on the same tower N2 as an example, there are N21 with straight line towers at both ends, N22 with strain towers at both ends, N23 with corner towers at both ends, N24 with transposition towers at both ends, and N26 with terminal towers at both ends.

[0052] (3) Selection according to the voltage level based on (2);

[0053] For example: taking the strain tower N22 at both ends as an example, different line voltage levels are selected. There are N221 for 1000kV, N222 for 800kV, N223 for 500kV, N224 for 330kV, N225 for 220kV, N226 for 110kV, N227 for 66kV, N228 for 35kV, and N229 for 10kV.

[0054] (4) Further selection according to the set principle of the environment on both sides of the span, such as the principle that “the range of 300 meters on both sides of the span requires to be open, flat, and free of trees, buildings, rivers, and other obstacles”.

[0055] As an optional implementation, one is selected for each of the typical spans of different tower types, conductor arrangement forms, and maximum voltage levels.

[0056] In the embodiment, the arrangement process of the overhead line detection point comprises:

[0057] The middle point of the overhead line span is taken as the starting detection point, and the points are arranged in sequence according to the set interval along the vertical line direction until the measurement endpoint is reached, as shown in the following formula: Figure 3

[0058] As an alternative embodiment, the points are arranged in sequence every 5m in the vertical line direction.

[0059] As an alternative embodiment, the measurement endpoint is reached when the measurement value first reaches 50V / m or below.

[0060] As an alternative embodiment, the middle point of the overhead line span is the middle point of the tower connecting line.

[0061] It can be understood that the tower has a span of about 10m in actual work, and the middle point of the tower connecting line area is still taken.

[0062] In the embodiment, the process of obtaining the power frequency electric field intensity of the overhead line detection point in the inspection time period comprises: using a required three-axis measuring instrument for fixed-point measurement.

[0063] Specifically, the measurement probe of the three-axis measuring instrument is erected at a height of 1.5m above the ground; the measurement personnel keep a distance of 2.5m or more from the probe; each detection point is measured three times to take the average value; rain and snow weather is avoided, and the environmental humidity is below 80%; all selected spans are measured in sequence; all measurement points, detection data, tower types and numbers, line numbers, names, voltage grades, etc. are recorded.

[0064] In the embodiment, the occupational exposure level determined according to the power frequency electric field intensity is:

[0065]

[0066] In the formula, t is the length of a working day, the unit is hour (h); E is the weighted average value of the power frequency electric field in a working day t, which is taken as the occupational exposure level, the unit is volt per meter (V / m) or kilovolt per meter (kV / m); T is the average value of the line inspection time of the post worker in a working day, the unit is hour (h); E i is the power frequency electric field intensity measured on site, the unit is volt per meter (V / m) or kilovolt per meter (kV / m); n is the sum of the number of points measured on site for all spans, the unit is hour (h).

[0067] Embodiment 2

[0068] The embodiment provides an overhead power transmission and distribution line power frequency electric field occupational exposure level detection system, comprising:​

[0069] The detection point arrangement module is configured to select an overhead line span, and arrange and control the detection points of the overhead line with a middle point of the overhead line span as a starting detection point.

[0070] The data acquisition module is configured to acquire the power frequency electric field intensity of the detection points of the overhead line in the inspection time period.

[0071] The professional exposure level determination module is configured to determine the professional exposure level according to the power frequency electric field intensity.

[0072] It should be noted that the above modules correspond to the steps described in Embodiment 1, and the above modules have the same examples and application scenarios as the corresponding steps, but are not limited to the content disclosed in Embodiment 1. It should be noted that the above modules as part of the system can be executed in a computer system such as a set of computer executable instructions.

[0073] In more embodiments, there are also provided:

[0074] An electronic device includes a memory and a processor, and computer instructions stored in the memory and running on the processor, when the computer instructions are run by the processor, the method described in Embodiment 1 is completed. For the sake of brevity, it will not be repeated here.

[0075] It should be understood that in the embodiments, the processor can be a central processing unit CPU, and the processor can also be other general-purpose processors, digital signal processors DSP, application-specific integrated circuits ASIC, ready-to-program gate arrays FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0076] The memory can include read-only memory and random access memory, and provide instructions and data to the processor, and a part of the memory can also include non-volatile random access memory. For example, the memory can also store device type information.

[0077] A computer readable storage medium for storing computer instructions, when the computer instructions are executed by the processor, the method described in Embodiment 1 is completed.

[0078] The method in the embodiment 1 can be directly embodied by a hardware processor or by a combination of hardware and software modules in the processor. The software modules can be located in a storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, or the like. The storage medium is located in a memory, and a processor reads information in the memory and combines hardware to complete the steps of the above method. To avoid repetition, no further detailed description is given herein.

[0079] Those skilled in the art can understand that the units and algorithm steps of the examples described in combination with the embodiments can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software manner depends on the specific application and design constraints of the technical solutions. A person skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0080] Although the specific embodiments of the present application are described above in combination with the drawings, the description is not a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the scope of protection of the present application.

Claims

1. A method for detecting occupational exposure levels to power frequency electric fields in overhead transmission and distribution lines, characterized in that, include: Select the span of the overhead line and set up the detection points of the overhead line with the midpoint of the span as the starting point. The span of the overhead line is two towers plus the middle line segment, which is one span; the midpoint of the span of the overhead line is the midpoint of the line connecting the towers; the selection of the span of the overhead line specifically includes: screening according to the conductor arrangement, tower type, voltage level and the environmental principles on both sides of the set span. The process of setting up detection points for overhead lines includes: starting from the initial detection point and laying out points sequentially along the direction perpendicular to the line according to the set intervals, until the specified distance is reached, and then determining the measurement endpoint; Obtain the power frequency electric field intensity at the overhead line inspection points during the inspection period; Occupational exposure levels are determined based on the intensity of the power frequency electric field.

2. The method for detecting occupational exposure levels of power frequency electric fields in overhead transmission and distribution lines as described in claim 1, characterized in that, The process of obtaining the power frequency electric field strength includes: using a triaxial measuring instrument for fixed-point measurement, setting the installation height of the triaxial measuring instrument probe and the distance between the measuring personnel and the measuring probe, and, under environmental conditions, measuring each overhead line detection point multiple times and taking the average value, and measuring all selected overhead line spans sequentially.

3. The method for detecting occupational exposure levels of power frequency electric fields in overhead transmission and distribution lines as described in claim 1, characterized in that, The occupational exposure level E, determined based on the power frequency electric field strength, is: ； In the formula, t The duration is one working day; T This represents the average inspection time during weekdays. E i The power frequency electric field strength; n This refers to the number of measurement points.

4. A system for detecting occupational exposure levels in power frequency electric fields of overhead transmission and distribution lines, characterized in that, include: The detection point deployment module is configured to select the span of the overhead line and deploy the detection points of the overhead line with the midpoint of the span as the starting detection point. The span of the overhead line is two towers plus the middle line segment, which is one span; the midpoint of the span of the overhead line is the midpoint of the line connecting the towers; the selection of the span of the overhead line specifically includes: screening according to the conductor arrangement, tower type, voltage level and the environmental principles on both sides of the set span. The process of setting up detection points for overhead lines includes: starting from the initial detection point and laying out points sequentially along the direction perpendicular to the line according to the set intervals, until the specified distance is reached, and then determining the measurement endpoint; The data acquisition module is configured to acquire the power frequency electric field strength at the overhead line detection points during the inspection period; The occupational exposure level determination module is configured to determine the occupational exposure level based on the power frequency electric field strength.

5. The occupational exposure level detection system for power frequency electric fields of overhead transmission and distribution lines as described in claim 4, characterized in that, The process of obtaining the power frequency electric field strength includes: using a triaxial measuring instrument for fixed-point measurement, setting the installation height of the triaxial measuring instrument probe and the distance between the measuring personnel and the measuring probe, and, under environmental conditions, measuring each overhead line detection point multiple times and taking the average value, and measuring all selected overhead line spans sequentially.

6. The occupational exposure level detection system for power frequency electric fields of overhead transmission and distribution lines as described in claim 4, characterized in that, The occupational exposure level E, determined based on the power frequency electric field strength, is: ； In the formula, t The duration is one working day; T This represents the average inspection time during weekdays. E i The power frequency electric field strength; n This refers to the number of measurement points.

7. An electronic device, characterized in that, It includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, which, when executed by the processor, perform the method according to any one of claims 1-3.

8. A computer-readable storage medium, characterized in that, Used to store computer instructions, which, when executed by a processor, perform the method described in any one of claims 1-3.

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