Method and system for acquiring radio interference level of high-altitude alternating-current transmission line

Abstract

The invention discloses a method and system for obtaining the radio interference level of a high-altitude alternating-current power transmission line, and the method comprises the steps: determining the position of a target measurement point of the high-altitude alternating-current power transmission line, and obtaining the radio interference measurement data of the position of the target measurement point in heavy rain and / or snowfall weather; screening the radio interference measurement data based on the duration of rain and snow weather, precipitation and wind speed to obtain target radio interference measurement data; and performing statistical analysis based on a radio interference measurement value in the target radio interference measurement data, and determining a radio interference average value of the AC power transmission line in the rainy and snowy weather. According to the invention, the long-term observation time of the high-altitude power transmission line can be greatly reduced, the radio interference level of the power transmission line can be rapidly obtained, the long-term test of a plurality of measuring points in a short time can be realized, the measurement efficiency is greatly improved, the danger of long-term observation in a high-altitude extremely severe environment is reduced, the popularization value is high, and the application prospect is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic environment of power system, and more particularly to a method and system for obtaining radio interference level of high-altitude AC transmission line. Background Art

[0002] my country's power grid is developing rapidly, and high-altitude power transmission and transformation projects are being widely constructed. Power transmission and transformation projects are getting closer and closer to residential areas. As people's environmental awareness continues to increase, people are paying more and more attention to the impact of the electromagnetic environment on power transmission and transformation projects. Radio interference is an important control indicator for ultra-high and ultra-high voltage AC transmission lines, which directly affects the economic and environmental protection of the project. Measuring and obtaining the actual level of the electromagnetic environment of high-altitude AC transmission and transformation projects, and then controlling the impact of the electromagnetic environment has become an important research issue in the field of power grid environmental protection. Since the radio interference of AC transmission lines varies greatly with weather conditions, its value can fluctuate by 25dB or even more in rainy and good weather. Therefore, IEC believes that in order to obtain the radio interference level of AC transmission lines, it is necessary to carry out long-term observations for more than one year and conduct statistical analysis on the measurement results. In the past, domestic and foreign studies on radio interference levels often lasted for 1-2 years, and the measurement time was particularly long. This is not only difficult to implement in high-altitude areas such as the Qinghai-Tibet Plateau, but also has high costs and risks. At present, the control of radio interference of ultra-high and extra-high voltage AC transmission lines mainly focuses on the average value of radio interference under heavy rain and good weather. How to quickly obtain the radio interference level of AC transmission lines through short-term measurement has always been an important issue in the research field of electromagnetic environment.

[0003] Therefore, a method is needed to obtain the radio interference level of high-altitude AC transmission lines through short-term observations. Summary of the invention

[0004] The present invention provides a method and system for obtaining the radio interference level of an AC power transmission line at a high altitude, so as to solve the problem of how to determine the radio interference level of an AC power transmission line in a high altitude area.

[0005] In order to solve the above problem, according to one aspect of the present invention, a method for obtaining the radio interference level of a high-altitude AC transmission line is provided, the method comprising:

[0006] Determine the target measuring point position of the high-altitude AC transmission line, and obtain radio interference measurement data of the target measuring point position under heavy rain and / or snowfall; wherein the radio interference measurement data includes: radio interference measurement values, rain and snow weather duration data, precipitation data and wind speed data with associated relationships;

[0007] Screen radio interference measurement data based on duration of rain and snow, precipitation and wind speed, and obtain target radio interference measurement data;

[0008] Statistical analysis is performed based on the radio interference measurement values ​​in the target radio interference measurement data to determine the average radio interference value of the AC power transmission line under rainy and snowy weather.

[0009] Preferably, the method further comprises:

[0010] Use radio interference measurement equipment to measure radio interference of AC transmission lines in heavy rain and / or snowfall;

[0011] Use the weather station to measure wind speed and precipitation data;

[0012] The weather phenomenon meter is used to identify the rainfall and / or snowfall per minute, so as to make a judgment on heavy rain and / or snowfall weather based on the rainfall and / or snowfall.

[0013] Preferably, the radio interference measuring device comprises: a receiver and a waterproof antenna, which is used for measuring the radio interference field strength of 0.5 MHz in all weather conditions.

[0014] Preferably, the screening of radio interference measurement data based on the duration of rain and snow weather, precipitation and wind speed to obtain target radio interference measurement data includes:

[0015] Based on the precipitation data, heavy rain and / or heavy snowfall weather is determined, and the radio interference measurement data when the duration of continuous rainfall and / or snowfall is greater than or equal to a preset duration threshold, the rainfall is greater than or equal to a preset precipitation threshold, and the wind speed is less than or equal to a preset wind speed threshold is screened as target radio interference measurement data; wherein, in snowy weather, the equivalent rainfall during snowfall is used as precipitation.

[0016] Preferably, the method further comprises:

[0017] Based on the difference between the average value of radio interference of the AC transmission line in rainy and snowy weather and the preset change value, the average value of radio interference of the AC transmission line in good weather is determined.

[0018] According to another aspect of the present invention, a system for obtaining a radio interference level of a high-altitude AC transmission line is provided, the system comprising:

[0019] A data acquisition unit is used to determine the target measuring point position of the high-altitude AC transmission line, and obtain the radio interference measurement data of the target measuring point position under heavy rain and / or snowfall; wherein the radio interference measurement data includes: radio interference measurement values ​​with associated relationships, rain and snow weather duration data, precipitation data, and wind speed data;

[0020] A data screening unit, used to screen the radio interference measurement data based on the duration of rain and snow weather, precipitation and wind speed, and obtain target radio interference measurement data;

[0021] The radio interference average value determination unit is used to perform statistical analysis based on the radio interference measurement values ​​in the target radio interference measurement data to determine the radio interference average value of the AC power transmission line under rainy and snowy weather.

[0022] Preferably, the system further comprises:

[0023] Radio interference measuring device, used to measure radio interference of AC power transmission lines under heavy rain and / or snowfall;

[0024] Weather station, used to measure wind speed and precipitation data;

[0025] A weather phenomenon meter is used to identify the rainfall and / or snowfall amount per minute to make a judgment on heavy rain and / or snowfall weather based on the rainfall and / or snowfall amount.

[0026] Preferably, the radio interference measuring device comprises: a receiver and a waterproof antenna, which is used for measuring the radio interference field strength of 0.5 MHz in all weather conditions.

[0027] Preferably, the data screening unit screens the radio interference measurement data based on the duration of rain and snow weather, precipitation and wind speed to obtain the target radio interference measurement data, including:

[0028] Based on the rainfall data, heavy rain and / or heavy snowfall weather is determined, and the radio interference measurement data when the duration of continuous rainfall and / or snowfall is greater than or equal to a preset duration threshold, the rainfall is greater than or equal to a preset precipitation threshold, and the wind speed is less than or equal to the preset wind speed threshold is screened as the target radio interference measurement data; wherein, in snowy weather, the equivalent rainfall during snowfall is used as precipitation.

[0029] Preferably, the radio interference average value determining unit further includes:

[0030] Based on the difference between the average value of radio interference of the AC transmission line in rainy and snowy weather and the preset change value, the average value of radio interference of the AC transmission line in good weather is determined.

[0031] The present invention provides a method and system for obtaining the radio interference level of a high-altitude AC transmission line, including: determining the target measuring point position of the high-altitude AC transmission line, obtaining the radio interference measurement data of the target measuring point position under heavy rain and / or snowfall; screening the radio interference measurement data based on the duration of rain and snow, precipitation and wind speed, and obtaining the target radio interference measurement data; performing statistical analysis based on the radio interference measurement values ​​in the target radio interference measurement data, and determining the average radio interference value of the AC transmission line under rain and snow. The present invention can greatly reduce the long-term observation time of the high-altitude transmission line, quickly obtain the radio interference level of the transmission line, and can realize long-term testing of multiple measuring points in a relatively short time, greatly improving the measurement efficiency, while reducing the danger of long-term observation in extremely harsh environments at high altitudes. The present invention can be used in the acquisition of electromagnetic environment characteristics and line optimization design of high-altitude AC transmission and transformation projects, with high promotion value and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0033] Figure 1 A flowchart of a method 100 for obtaining a radio interference level of a high-altitude AC transmission line according to an embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of a measuring device according to an embodiment of the present invention;

[0035] Figure 3 It is a schematic diagram of the structure of a system 300 for obtaining radio interference level of high-altitude AC power transmission lines according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0037] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0038] Figure 1FIG. 1 is a flow chart of a method 100 for obtaining radio interference level of high altitude AC transmission lines according to an embodiment of the present invention. Figure 1 As shown, the method for obtaining the radio interference level of a high-altitude AC transmission line provided by the embodiment of the present invention can greatly reduce the long-term observation time of the high-altitude transmission line, quickly obtain the radio interference level of the transmission line, and can realize long-term testing of multiple measuring points in a short time, greatly improve the measurement efficiency, and reduce the danger of long-term observation in extremely harsh environments at high altitudes. The present invention can be used in the acquisition of electromagnetic environment characteristics and line optimization design of high-altitude AC transmission and transformation projects, with high promotion value and broad application prospects. The method 100 for obtaining the radio interference level of a high-altitude AC transmission line provided by the embodiment of the present invention starts from step 101. In step 101, the target measuring point position of the high-altitude AC transmission line is determined, and the radio interference measurement data of the target measuring point position under heavy rain and / or snowfall weather is obtained; wherein the radio interference measurement data includes: radio interference measurement values ​​with associated relationships, rain and snow weather duration data, precipitation data, and wind speed data.

[0039] Preferably, the method further comprises:

[0040] Use radio interference measurement equipment to measure radio interference of AC transmission lines in heavy rain and / or snowfall;

[0041] Use the weather station to measure wind speed and precipitation data;

[0042] The weather phenomenon meter is used to identify the rainfall and / or snowfall per minute, so as to make a judgment on heavy rain and / or snowfall weather based on the rainfall and / or snowfall.

[0043] Preferably, the radio interference measuring device comprises: a receiver and a waterproof antenna, which is used for measuring the radio interference field strength of 0.5 MHz in all weather conditions.

[0044] Combination Figure 2As shown, in the present invention, a radio interference measuring device, a small weather station, a weather phenomenon instrument and a computer are used, and the antenna and the receiver form a radio interference measuring device. The antenna and the receiver are connected through a high-frequency coaxial cable, and the receiver, the small weather station, and the antenna phenomenon instrument are connected to the computer through a communication line. The antenna is placed outdoors, which can be suitable for the needs of long-term observation of severe weather such as rain and snow. Through short-term observation of radio interference of high-altitude AC power transmission lines in rainy or snowy seasons, radio interference measurement data can be obtained. Among them, the radio interference measuring device is composed of a receiver and a waterproof antenna, which can measure the 0.5MHz radio interference field strength all day long. The small weather station can accurately measure precipitation and wind speed. The weather phenomenon instrument identifies and measures the rainfall and snowfall per minute through an optical measurement system. During the measurement, the 0.5MHz radio interference and meteorological parameters such as precipitation and wind speed are synchronously measured by computer control, and the measurement time interval is no more than 1 minute. The observation is carried out in the local rainy or snowy season, and the continuous observation time is no less than 1 day.

[0045] In step 102, the radio interference measurement data is screened based on the duration of the rain and snow weather, the precipitation, and the wind speed to obtain target radio interference measurement data.

[0046] Preferably, the screening of radio interference measurement data based on the duration of rain and snow weather, precipitation and wind speed to obtain target radio interference measurement data includes:

[0047] Based on the precipitation data, determine the heavy rain and / or heavy snowfall weather, and select the radio interference measurement data when the duration of continuous rainfall and / or snowfall is greater than or equal to the preset duration threshold, the rainfall is greater than or equal to the preset precipitation threshold, and the wind speed is less than or equal to the preset wind speed threshold as the target radio interference measurement data. The precipitation includes rainfall and snowfall. In snowy weather, the equivalent rainfall during snowfall can also be used as precipitation.

[0048] In the present invention, the preset duration threshold is 2 hours, the preset precipitation threshold is 5 mm / h, and the preset wind speed threshold is 3 m / s. Heavy rain and / or heavy snowfall weather is determined based on rainfall data, and the radio interference measurement data when the duration of continuous rainfall and / or snowfall is greater than or equal to 2 hours, the rainfall or equivalent rainfall during snowfall is greater than or equal to 5 mm / h, and the wind speed is less than or equal to 3 m / s is screened as the target radio interference measurement data.

[0049] In step 103, statistical analysis is performed based on the radio interference measurement values ​​in the target radio interference measurement data to determine an average value of radio interference of the AC power transmission line under rainy and snowy weather.

[0050] Preferably, the method further comprises:

[0051] Based on the difference between the average value of radio interference of the AC transmission line in rainy and snowy weather and the preset change value, the average value of radio interference of the AC transmission line in good weather is determined.

[0052] In the present invention, when the radio interference under continuous heavy rain or snowfall is statistically analyzed, the corresponding radio interference changes with time on the frequency point diagram approximately in a straight line, showing a saturation trend. By performing statistical analysis on the radio interference under continuous heavy rain or snowfall, the average value of the radio interference under heavy rain or heavy snowfall is obtained, which can represent the radio interference level under heavy rain conditions.

[0053] After obtaining the average value of the radio interference under heavy rain conditions, the average value of the radio interference of the high-altitude AC transmission line under good weather conditions can be obtained by subtracting the preset change value 20dB.

[0054] It should be noted here that, considering the needs of long-term field testing and the harsh environment at high altitudes, the operating temperature range of each measuring device should meet the use needs of -40℃ to 40℃. Radio interference measuring devices, meteorological stations, and weather phenomena instruments should be calibrated in a timely manner to ensure that the data during the measurement period is accurate and valid. Radio interference is approximately saturated under continuous heavy rain and strong rainfall. The measurement results can represent the radio interference level under heavy rain conditions. The wind speed is limited to less than 3m / s to avoid large swings or dancing of the conductor under strong wind conditions, which is difficult to represent the radio interference level under the stable layout of the line. The fluctuation range of radio interference data in good weather is very wide. It is generally believed that the difference in radio interference from heavy rain to good weather is 16-25dB or even greater. The 20dB calculation difference proposed in this aspect is based on the statistical results of a large amount of data, which is obtained by actual measurement and statistics of multiple long-term observation stations of AC transmission lines on the Qinghai-Tibet Plateau. Its value is different from the 18dB recommended for low-altitude areas, and it is more accurate and effective.

[0055] The present invention uses a radio interference measurement device, a small weather station, a weather phenomenon meter, and a computer to perform short-term observations of radio interference of high-altitude AC power transmission lines in rainy or snowy seasons, and to perform statistics on radio interference under continuous heavy rain or heavy snowfall, thereby obtaining radio interference values ​​under heavy rain and good weather. This method can greatly reduce the long-term observation time of high-altitude transmission lines, quickly obtain the actual level of radio interference of transmission lines, and realize long-term testing of multiple measuring points in a relatively short time, greatly improving measurement efficiency, while reducing the risks brought by long-term observations in extremely harsh environments at high altitudes.

[0056] The following specifically illustrates the embodiments of the present invention.

[0057] The method of the present invention for quickly obtaining the radio interference level of high-altitude AC transmission lines through short-term observation mainly includes:

[0058] Step 1: Pre-select the measurement point location of the high-altitude AC transmission line to be tested. According to the historical weather, in the rainy or snowy season with more rain and snow in the local area, place the antenna of a radio interference measurement device 20m outside the projection of the phase conductor of the transmission line, and connect the antenna output to the receiver input.

[0059] Step 2: Place a small weather station and a weather instrument near the measuring point. The small weather station and the weather instrument should not generate large radio interference when working, which will affect the measurement of line radio interference. If necessary, an isolated power supply can be used to supply power separately.

[0060] Step 3: Turn on the computer, radio interference measuring device, small weather station, and weather phenomenon instrument. The computer controls each device to synchronously measure 0.5MHz radio interference, wind speed, rainfall (snow) and other meteorological parameters. The measurement time interval should not be greater than 1 minute.

[0061] Step 4: Observe and save the measurement data.

[0062] Step 5: Filter out the radio interference measurement data under the conditions of continuous heavy rain or heavy snowfall, where the duration of continuous rainfall or snowfall is not less than 2 hours, the rainfall and equivalent precipitation during snowfall are not less than 5mm / h, and the wind speed is not more than 3m / s. If the change of radio interference over time on the frequency point diagram is approximately a straight line, calculate the average value of radio interference under such conditions.

[0063] Step 6: The calculated average radio interference value in heavy rain or heavy snowfall can represent the radio interference level in heavy rain conditions. The average radio interference value in good weather is obtained by subtracting 20dB from the radio interference level in heavy rain conditions.

[0064] Figure 3 FIG. 3 is a schematic diagram of a system 300 for obtaining radio interference levels of high-altitude AC power transmission lines according to an embodiment of the present invention. Figure 3 As shown, the system 300 for obtaining the radio interference level of high-altitude AC power transmission lines provided by the embodiment of the present invention includes: a data obtaining unit 301, a data screening unit 302 and a radio interference average value determining unit 303.

[0065] Preferably, the data acquisition unit 301 is used to determine the target measuring point position of the high-altitude AC transmission line, and obtain radio interference measurement data of the target measuring point position under heavy rain and / or snowfall; wherein the radio interference measurement data includes: radio interference measurement values ​​with associated relationships, rain and snow weather duration data, rainfall data and wind speed data.

[0066] Preferably, the system further comprises:

[0067] Radio interference measuring device, used to measure radio interference of AC power transmission lines under heavy rain and / or snowfall;

[0068] Weather station, used to measure wind speed and rainfall data;

[0069] A weather phenomenon meter is used to identify the rainfall and / or snowfall amount per minute to make a judgment on heavy rain and / or snowfall weather based on the rainfall and / or snowfall amount.

[0070] Preferably, the radio interference measuring device comprises: a receiver and a waterproof antenna, which is used for measuring the radio interference field strength of 0.5 MHz in all weather conditions.

[0071] Preferably, the data screening unit 302 is used to screen the radio interference measurement data based on the duration of rain and snow weather, rainfall and wind speed, and obtain target radio interference measurement data.

[0072] Preferably, the data screening unit 302 screens the radio interference measurement data based on the duration of rain and snow weather, precipitation and wind speed to obtain the target radio interference measurement data, including:

[0073] Based on the rainfall data, heavy rain and / or heavy snowfall weather is determined, and the radio interference measurement data when the duration of continuous rainfall and / or snowfall is greater than or equal to a preset duration threshold, the rainfall is greater than or equal to a preset precipitation threshold, and the wind speed is less than or equal to the preset wind speed threshold is screened as the target radio interference measurement data; wherein, in snowy weather, the equivalent rainfall during snowfall is used as precipitation.

[0074] Preferably, the radio interference average value determining unit 303 is used to perform statistical analysis based on the radio interference measurement values ​​in the target radio interference measurement data to determine the average value of the radio interference of the AC power transmission line in rainy and snowy weather.

[0075] Preferably, the radio interference average value determining unit 303 further includes:

[0076] Based on the difference between the average value of radio interference of the AC transmission line in rainy and snowy weather and the preset change value, the average value of radio interference of the AC transmission line in good weather is determined.

[0077] The system 300 for obtaining radio interference level of high altitude AC transmission line in the embodiment of the present invention corresponds to the method 100 for obtaining radio interference level of high altitude AC transmission line in another embodiment of the present invention, and will not be described in detail herein.

[0078] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0079] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of said means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

[0080] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0081] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0082] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0083] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0084] 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 above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for obtaining the radio interference level of high-altitude AC transmission lines, characterized in that: The method comprises: Determine the target measuring point position of the high-altitude AC transmission line, and obtain radio interference measurement data of the target measuring point position under heavy rain and / or snowfall; wherein the radio interference measurement data includes: radio interference measurement values, rain and snow weather duration data, precipitation data and wind speed data with associated relationships; Screen radio interference measurement data based on duration of rain and snow, precipitation and wind speed, and obtain target radio interference measurement data; Statistical analysis is performed based on the radio interference measurement values ​​in the target radio interference measurement data to determine the average radio interference value of the AC power transmission line under rainy and snowy weather.

2. The method according to claim 1, characterized in that The method further comprises: Use radio interference measurement equipment to measure radio interference of AC transmission lines in heavy rain and / or snowfall; Use the weather station to measure wind speed and precipitation data; The weather phenomenon meter is used to identify the rainfall and / or snowfall per minute, so as to make a judgment on heavy rain and / or snowfall weather based on the rainfall and / or snowfall.

3. The method according to claim 2, characterized in that The radio interference measuring device comprises a receiver and a waterproof antenna, and is used for measuring the radio interference field strength of 0.5 MHz around the clock.

4. The method according to claim 1, characterized in that: The screening of radio interference measurement data based on the duration of rain and snow weather, precipitation and wind speed to obtain target radio interference measurement data includes: Based on the precipitation data, heavy rain and / or heavy snowfall weather is determined, and the radio interference measurement data when the duration of continuous rainfall and / or snowfall is greater than or equal to a preset duration threshold, the precipitation is greater than or equal to a preset precipitation threshold, and the wind speed is less than or equal to a preset wind speed threshold is screened as target radio interference measurement data; wherein, in snowy weather, the equivalent rainfall during snowfall is taken as precipitation.

5. The method according to claim 1, characterized in that The method further comprises: Based on the difference between the average value of radio interference of the AC transmission line in rainy and snowy weather and the preset change value, the average value of radio interference of the AC transmission line in good weather is determined.

6. A system for obtaining radio interference levels of AC power transmission lines at high altitudes, characterized in that: The system comprises: A data acquisition unit is used to determine the target measuring point position of the high-altitude AC transmission line, and obtain the radio interference measurement data of the target measuring point position under heavy rain and / or snowfall; wherein the radio interference measurement data includes: radio interference measurement values ​​with associated relationships, rain and snow weather duration data, precipitation data, and wind speed data; A data screening unit, used to screen the radio interference measurement data based on the duration of rain and snow weather, precipitation and wind speed, and obtain target radio interference measurement data; The radio interference average value determination unit is used to perform statistical analysis based on the radio interference measurement values ​​in the target radio interference measurement data to determine the radio interference average value of the AC power transmission line under rainy and snowy weather.

7. The system according to claim 1, characterized in that The system further comprises: Radio interference measuring device, used to measure radio interference of AC power transmission lines under heavy rain and / or snowfall; Weather station, used to measure wind speed and precipitation data; A weather phenomenon meter is used to identify the rainfall and / or snowfall amount per minute to make a judgment on heavy rain and / or snowfall weather based on the rainfall and / or snowfall amount.

8. The system according to claim 7, characterized in that The radio interference measuring device comprises a receiver and a waterproof antenna, and is used for measuring the radio interference field strength of 0.5 MHz around the clock.

9. The system according to claim 6, characterized in that The data screening unit screens the radio interference measurement data based on the duration of rain and snow weather, precipitation and wind speed to obtain target radio interference measurement data, including: Based on the precipitation data, heavy rain and / or heavy snowfall weather is determined, and the radio interference measurement data when the duration of continuous rainfall and / or snowfall is greater than or equal to a preset duration threshold, the precipitation is greater than or equal to a preset precipitation threshold, and the wind speed is less than or equal to a preset wind speed threshold is screened as target radio interference measurement data; wherein, in snowy weather, the equivalent rainfall during snowfall is taken as precipitation.

10. The system according to claim 6, characterized in that The radio interference average value determining unit further includes: Based on the difference between the average value of radio interference of the AC transmission line in rainy and snowy weather and the preset change value, the average value of radio interference of the AC transmission line in good weather is determined.

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