Power frequency electric field intensity prediction method, computer readable storage medium and equipment

Abstract

The invention discloses a power frequency electric field intensity prediction method, a computer readable storage medium and equipment, and the method comprises the steps: obtaining the voltage grade of an electric power facility in a proposed power station, and selecting an existing power station where the electric power facility with the voltage grade being a target grade is located as an analog power station, the difference value between the target grade and the voltage grade of the electric power facility in the proposed power station does not exceed a preset difference value; setting a plurality of inspection points in the analogy power station according to the electric power facility, respectively measuring the power frequency electric field intensity at each inspection point, and taking the contact duration of the operator at each inspection point in the analogy power station as a first duration; according to the number of each electric power facility in the proposed power station and the first duration, converting the expected contact duration of the operator at each inspection point in the proposed power station; based on the power frequency electric field intensity of each inspection point in the analogy power station and the expected contact duration of each inspection point in the proposed power station, the power frequency electric field intensity of contact of the operator at each inspection point in the proposed power station is determined, and the prediction accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric field measurement, and in particular to a method for predicting power frequency electric field strength and a computer-readable storage medium and device. Background Art

[0002] With the rapid development of my country's power industry, the number of high-voltage transmission and transformation facilities has increased dramatically, and occupational exposure of workers to power-frequency electric fields is becoming increasingly common. Long-term exposure to high-intensity power-frequency electric fields can pose potential health risks to workers. Therefore, accurately assessing power-frequency electric field intensity is crucial for protecting the occupational health of power industry workers.

[0003] Currently, although power-frequency electric field testers can be used to directly measure the electric field strength at the operating location, direct testing at a proposed power plant presents practical difficulties. Firstly, the proposed power plant will not be operational during the construction period, making it impossible to perform power-frequency electric field measurements in a real-world environment. Secondly, existing methods often rely on theoretical simulations and lack calibration based on real-world operating data, resulting in significant deviations between predicted results and actual operating conditions, affecting measurement accuracy. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for predicting the power frequency electric field strength, a computer-readable storage medium, and a device. By selecting an analog power station with a similar voltage level, a conversion prediction is performed based on the measured electric field strength data and the contact time of the operators, and the power frequency electric field strength that the operators are exposed to at each inspection point of the proposed power station is determined, thereby improving the measurement accuracy.

[0005] The technical solution adopted by the present invention is a method for predicting the power frequency electric field strength, which includes the following steps: obtaining the voltage level of the power facilities in the proposed power station, selecting the existing power station where the power facilities with a voltage level of the target level are located as the analog power station, and the difference between the target level and the voltage level of the power facilities in the proposed power station does not exceed the preset difference; setting multiple inspection points in the analog power station according to the power facilities, measuring the power frequency electric field strength at each inspection point respectively, and taking the contact time of the operating personnel at each inspection point in the analog power station as the first time; converting the expected contact time of the operating personnel at each inspection point in the proposed power station according to the number of power facilities in the proposed power station and the first time; determining the power frequency electric field strength to which the operating personnel are exposed at each inspection point in the proposed power station based on the power frequency electric field strength at each inspection point in the analog power station and the expected contact time of each inspection point in the proposed power station.

[0006] Furthermore, the power facilities include generators, main transformers, excitation transformers, high-voltage plant transformers, live equipment in the outgoing line field and GIS combination electrical appliances. According to the power facilities, multiple inspection points are set up in the analog power station, including: setting an inspection point 1 meter in front of the generator; setting an inspection point 2 meters on the side of the main transformer; setting an inspection point 2 meters on the side of the excitation transformer; setting an inspection point 2 meters on the side of the high-voltage plant transformer; setting an inspection point 1 meter in front of the live equipment in the outgoing line field; and setting an inspection point 1 meter outside the GIS combination electrical appliance.

[0007] Furthermore, measuring the power frequency electric field strength at each inspection point includes: measuring the power frequency electric field strength at different heights of each inspection point; performing arithmetic averaging on the power frequency electric field strengths measured at different heights to obtain the power frequency electric field strength at the corresponding inspection point.

[0008] Furthermore, measuring the power frequency electric field strength at different heights at each inspection point includes measuring the power frequency electric field strength at heights corresponding to the head, chest, and abdomen of an operator with a height of 1.75 meters at each inspection point.

[0009] Furthermore, based on the number of power facilities in the proposed power station and the first duration, the expected contact duration of the operating personnel at each inspection point in the proposed power station is converted, including: converting the expected contact duration based on the first formula, the first formula is:

[0010] T 建，i =T 类， i×J i

[0011] Among them, T 建，i T represents the expected contact time of the i-th inspection point of the proposed power station, 类，i represents the operator’s contact time at the i-th inspection point in the analog power station, J i Represents the number of the i-th power facility in the proposed power station.

[0012] Furthermore, the above method also includes: determining the weighted average value of the 8-hour exposure of the operating personnel to the power frequency electric field at the proposed power station based on the power frequency electric field intensity at each inspection point in the analog power station and the expected exposure time at each inspection point in the proposed power station; comparing the weighted average value with the preset power frequency electric field occupational exposure limit to determine whether the power frequency electric field intensity to which the operating personnel are exposed meets the occupational regulations; if the weighted average value is less than the preset power frequency electric field occupational exposure limit, then the power frequency electric field intensity to which the operating personnel are exposed meets the occupational regulations.

[0013] Furthermore, based on the power frequency electric field intensity at each inspection point in the analog power station and the expected exposure time at each inspection point in the proposed power station, determining the weighted average value of the operator's exposure to the power frequency electric field for 8 hours at the proposed power station includes: determining the weighted average value of the operator's exposure to the power frequency electric field for 8 hours at the proposed power station based on a second formula, the second formula being:

[0014]

[0015] Among them, E8 represents the weighted average value of the workers’ exposure to the power frequency electric field for 8 hours at the proposed power station, and E i Represents the power frequency electric field strength at each inspection point in the analog power station, T i It represents the expected contact time of each inspection point in the proposed power station.

[0016] The beneficial effect of the power frequency electric field strength prediction method provided by the present invention is that, compared with the existing technology, the above method obtains the voltage level of the power facilities in the proposed power station and selects an existing power station whose voltage level difference with the voltage level of the power facilities of the proposed power station does not exceed a preset difference as an analog power station, thereby ensuring that the analog power station is highly consistent with the proposed power station in voltage level and operating environment, thereby improving the representativeness of subsequent measurement data and the accuracy of prediction evaluation; in the analog power station, multiple inspection points are set according to the power facilities, and the power frequency electric field strength at each inspection point is measured respectively, and the contact time of the operating personnel at each inspection point is recorded as the first time, which can more truly and comprehensively reflect the occupational exposure of the operating personnel in the actual working environment; further, according to the number of each power facility in the proposed power station and the first time, the expected contact time of the operating personnel at each inspection point of the proposed power station is converted, and based on the power frequency electric field strength of each inspection point measured by the analog power station and the expected contact time of the proposed power station, the power frequency electric field strength of the operating personnel at each inspection point in the proposed power station is determined. It can be seen that by introducing the measured data of the analog power station and combining it with the actual contact behavior for conversion prediction, the present invention can solve the problem that the proposed power station has not yet been put into operation and the power frequency electric field cannot be directly measured. At the same time, it can avoid the prediction bias caused by relying on theoretical simulation and estimation, and can improve the accuracy of occupational exposure assessment in the working environment of the proposed power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a flow chart of a method for predicting power frequency electric field strength disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] The present invention discloses a method for predicting power-frequency electric field strength. This method uses analog power plants with similar voltage levels and performs a conversion prediction based on measured electric field strength data and worker exposure duration. This method determines the power-frequency electric field strength workers will be exposed to at each inspection point in a proposed power plant, thereby improving measurement accuracy. This is described in detail below.

[0021] See also Figure 1 , Figure 1 The present invention discloses a method for predicting power frequency electric field strength. The method may include the following steps.

[0022] 101. Obtain the voltage level of the power facilities in the proposed power station, select an existing power station where the power facilities with a voltage level equal to the target level are located as an analogy power station, and the difference between the target level and the voltage level of the power facilities in the proposed power station shall not exceed a preset difference.

[0023] In this example, based on the voltage levels of the proposed power plant's electrical facilities (such as generators, main transformers, excitation transformers, high-voltage auxiliary transformers, live equipment in the outgoing line field, and GIS), an existing power plant with a voltage level no more than ±50 kV different from the proposed power plant's facilities can be selected as a reference power plant. Selecting an existing power plant with a similar voltage level ensures that subsequent measurement data is representative, facilitating accurate prediction of occupational exposure levels to power-frequency electric fields for workers at the proposed power plant.

[0024] In some embodiments, when the power facility system includes multi-voltage level equipment, each subsystem can be used to match or calculate the weighted average voltage of the power facility separately to ensure that the difference between the target level of the analog power station and the voltage level of the power facility in the proposed power station does not exceed the preset difference.

[0025] 102. Set up multiple inspection points in the analog power station based on the power facilities, measure the power frequency electric field intensity at each inspection point respectively, and use the contact time of the operating personnel at each inspection point in the analog power station as the first time length.

[0026] In some embodiments, the power facilities may include a generator, a main transformer, an excitation transformer, a high-voltage plant transformer, outgoing line field energized equipment, and a GIS combined electrical appliance.

[0027] Setting up multiple inspection points in the analog power station according to the power facilities may include: setting up inspection points for different power facilities respectively, such as setting up an inspection point 1 meter in front of the generator; setting up an inspection point 2 meters on the side of the main transformer; setting up an inspection point 2 meters on the side of the excitation transformer; setting up an inspection point 2 meters on the side of the high-voltage plant transformer; setting up an inspection point 1 meter in front of the live equipment in the outgoing line field; setting up an inspection point 1 meter outside the GIS combination electrical appliance.

[0028] In some embodiments, measuring the power frequency electric field strength at each inspection point may include: measuring the power frequency electric field strength at different height positions at each inspection point; performing arithmetic averaging on the power frequency electric field strength measured at different height positions to obtain the power frequency electric field strength of the corresponding inspection point.

[0029] Specifically, at each inspection point, the measuring probe can be fixed on an insulating material bracket based on simulating the natural standing posture of the operator, and the industrial frequency electric field strength at different preset heights at each inspection point can be measured respectively. Specifically, at each inspection point, the electric field strength at positions of 1.75 meters high, 1.2 meters high and 0.9 meters high can be measured respectively.

[0030] In some embodiments, measuring the power frequency electric field strength at different heights at each inspection point includes measuring the power frequency electric field strength at heights corresponding to the head, chest, and abdomen of an operator with a height of 1.75 meters at each inspection point.

[0031] In the selected analog power station, the power frequency electric field strength at the corresponding heights of the head, chest and abdomen of an operator with a height of 1.75 meters was measured using power frequency electric field detection equipment 1 meter in front of the generator, 2 meters on the side of the main transformer, 2 meters on the side of the excitation transformer, 2 meters on the side of the high-voltage plant transformer, 1 meter in front of the live equipment in the outgoing line field, and 1 meter outside the GIS combination electrical appliance. The arithmetic average of the power frequency electric field strengths at the head, chest and abdomen was taken as the power frequency electric field strength at the inspection point.

[0032] Among them, the head refers to the uppermost edge of the head when the operator stands naturally upright, the chest refers to the position near the level of the nipple, and the abdomen refers to the position near the level of the navel.

[0033] 103. Based on the number and first duration of each power facility in the proposed power station, calculate the expected contact time of the operating personnel at each inspection point in the proposed power station.

[0034] In some embodiments, based on the number of power facilities in the proposed power station and the first duration, the expected contact duration of the operator at each inspection point in the proposed power station may include:

[0035] The expected contact time is calculated based on the first formula:

[0036] T 建，i =T 类， i×J i

[0037] Among them, T 建，i T represents the expected contact time of the i-th inspection point of the proposed power station, 类，i represents the operator’s contact time at the i-th inspection point in the analog power station, J i Represents the number of the i-th power facility in the proposed power station.

[0038] For example, if the operator's contact time at the inspection point corresponding to the main transformer in the analog power station is 0.5 hours, and the number of main transformers in the proposed power station is 4, then the expected contact time at the inspection point corresponding to the main transformer of the proposed power station is T 建，i =T 类，i ×J i =0.5*4=2.

[0039] 104. Based on the power frequency electric field intensity at each inspection point in the analog power station and the expected exposure time at each inspection point in the proposed power station, determine the power frequency electric field intensity to which the operating personnel will be exposed at each inspection point in the proposed power station.

[0040] The beneficial effect of the power frequency electric field strength prediction method provided by the present invention is that, compared with the existing technology, the above method obtains the voltage level of the power facilities in the proposed power station and selects an existing power station whose voltage level difference with the voltage level of the power facilities of the proposed power station does not exceed a preset difference as an analog power station, thereby ensuring that the analog power station is highly consistent with the proposed power station in voltage level and operating environment, thereby improving the representativeness of subsequent measurement data and the accuracy of prediction evaluation; in the analog power station, multiple inspection points are set according to the power facilities, and the power frequency electric field strength at each inspection point is measured respectively, and the contact time of the operating personnel at each inspection point is recorded as the first time, which can more truly and comprehensively reflect the occupational exposure of the operating personnel in the actual working environment; further, according to the number of each power facility in the proposed power station and the first time, the expected contact time of the operating personnel at each inspection point of the proposed power station is converted, and based on the power frequency electric field strength of each inspection point measured by the analog power station and the expected contact time of the proposed power station, the power frequency electric field strength of the operating personnel at each inspection point in the proposed power station is determined. It can be seen that by introducing the measured data of the analog power station and combining it with the actual contact behavior for conversion prediction, the present invention can solve the problem that the proposed power station has not yet been put into operation and the power frequency electric field cannot be directly measured. At the same time, it can avoid the prediction bias caused by relying on theoretical simulation and estimation, and can improve the accuracy of occupational exposure assessment in the working environment of the proposed power station.

[0041] In an embodiment of the present invention, the above-mentioned power frequency electric field strength prediction method may further include: determining the weighted average value of the 8-hour exposure of the operating personnel to the power frequency electric field at the proposed power station based on the power frequency electric field strength at each inspection point in the analog power station and the expected exposure time at each inspection point in the proposed power station; comparing the weighted average value with the preset power frequency electric field occupational exposure limit to determine whether the power frequency electric field strength to which the operating personnel are exposed meets the occupational regulations; if the weighted average value is less than the preset power frequency electric field occupational exposure limit, the power frequency electric field strength to which the operating personnel are exposed meets the occupational regulations.

[0042] In some embodiments, determining the weighted average of the operator's exposure to the power frequency electric field for 8 hours at the proposed power station based on the power frequency electric field intensity at each inspection point in the analog power station and the expected exposure time at each inspection point in the proposed power station includes: determining the weighted average of the operator's exposure to the power frequency electric field for 8 hours at the proposed power station based on a second formula, the second formula being:

[0043]

[0044] Among them, E8 represents the weighted average value of the workers’ exposure to the power frequency electric field for 8 hours at the proposed power station, and E i Represents the power frequency electric field strength at each inspection point in the analog power station, T i It represents the expected contact time of each inspection point in the proposed power station.

[0045] Data test example:

[0046] The project background of the proposed power station and the analogous power station is shown in Table 1:

[0047] Table 1

[0048] name Proposed power station Analog power station Craftsmanship hydropower hydropower Industry Power production Power production Main production equipment turbines, generators, transformers turbines, generators, transformers occupational hazards Power frequency electric field Power frequency electric field Operation method Inspection Inspection Working time 8 hours / day 8 hours / day

[0049] The test results of the power frequency electric field strength of the analog power station and the evaluation of the proposed power station are shown in Table 2:

[0050] Table 2

[0051]

[0052] It should be noted that computer-readable media include permanent and non-permanent, removable and non-removable media that can implement information storage by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, disk storage, quantum memory, graphene-based storage media or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for predicting power frequency electric field strength, characterized in that: The following steps are involved: Obtaining the voltage level of the power facilities in the proposed power station, selecting an existing power station where the power facilities have a voltage level equal to the target level as an analogy power station, where the difference between the target level and the voltage level of the power facilities in the proposed power station does not exceed a preset difference; Setting a plurality of inspection points in the analog power station according to the power facilities, measuring the power frequency electric field strength at each inspection point, and taking the contact time of the operator at each inspection point in the analog power station as the first time length; Calculate the expected contact time of operators at each inspection point in the proposed power station based on the number of power facilities in the proposed power station and the first duration; Based on the power frequency electric field strength at each inspection point in the analog power station and the expected contact time at each inspection point in the proposed power station, the power frequency electric field strength to which the operating personnel are exposed at each inspection point in the proposed power station is determined.

2. The method for predicting power frequency electric field strength according to claim 1, characterized in that: The power facilities include generators, main transformers, excitation transformers, high-voltage plant transformers, live equipment in the outgoing line field, and GIS combined electrical appliances. The multiple inspection points set in the analog power station according to the power facilities include: The inspection point is set 1 meter in front of the generator; The inspection point is set 2 meters from the side of the main transformer; The inspection point is set 2 meters from the side of the excitation transformer; The inspection point is set 2 meters from the side of the high-voltage plant transformer; The inspection point is set 1 meter in front of the live equipment in the outgoing line field; The inspection point is set 1 meter outside the GIS combination electrical appliance.

3. The method for predicting power frequency electric field strength according to claim 2, characterized in that: The respectively measuring the power frequency electric field strength at each inspection point comprises: Measuring the power frequency electric field strength at different heights of each inspection point; The power frequency electric field strength measured at different height positions is subjected to arithmetic averaging to obtain the power frequency electric field strength corresponding to the inspection point.

4. The method for predicting power frequency electric field strength according to claim 3, characterized in that: The separately measuring the power frequency electric field strength at different height positions at each inspection point includes: separately measuring the power frequency electric field strength at height positions corresponding to the head, chest and abdomen of an operator with a height of 1.75 meters at each inspection point.

5. The method for predicting power frequency electric field strength according to claim 1, characterized in that: The conversion of the expected contact time of the operator at each inspection point in the proposed power station based on the number of power facilities in the proposed power station and the first time period includes: The expected contact duration is converted based on a first formula, which is: T 建，i =T 类，i ×J i Among them, T 建，i T represents the expected contact time of the i-th inspection point of the proposed power station, 类，i represents the operator's contact time at the i-th inspection point in the analog power station, J i Represents the number of the i-th power facilities in the proposed power station.

6. The method for predicting power frequency electric field strength according to any one of claims 1 to 5, characterized in that: The method further comprises: Determining a weighted average of an operator's exposure to the power frequency electric field for 8 hours at the proposed power station based on the power frequency electric field intensity at each inspection point in the analog power station and the expected exposure time at each inspection point in the proposed power station; Comparing the weighted average value with the preset occupational exposure limit for power frequency electric fields to determine whether the intensity of the power frequency electric field to which the operator is exposed complies with occupational regulations; If the weighted average value is less than the preset occupational exposure limit for power frequency electric fields, the power frequency electric field intensity to which the operator is exposed complies with occupational regulations.

7. The method for predicting power frequency electric field strength according to claim 6, characterized in that: Determining the weighted average value of the operator's exposure to the power frequency electric field for 8 hours at the proposed power station based on the power frequency electric field intensity at each inspection point in the analog power station and the expected exposure time at each inspection point in the proposed power station includes: The weighted average value of the workers' exposure to the power frequency electric field at the proposed power station for 8 hours is determined based on the second formula. The second formula is: Among them, E8 represents the weighted average value of the workers’ exposure to the power frequency electric field for 8 hours at the proposed power station, and E i represents the power frequency electric field strength at each inspection point in the analog power station, T i It represents the expected contact time of each inspection point in the proposed power station.

8. A computer-readable storage medium, characterized in that Computer instructions are stored thereon, and when the computer instructions are executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

9. A computer device, characterized in that: The computer device includes a memory, a processor, and a program stored and executable on the memory, and when the program is executed by the processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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