A corona noise measurement method and system under different air pressure conditions

Abstract

The present invention discloses a method and system for measuring corona noise under different air pressure conditions, wherein the method comprises: applying voltage to a standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge; after the standard hardware generates the stable corona discharge, keeping the voltage applied to the standard hardware unchanged, adjusting the closed environment in which the standard hardware is located to multiple air pressure values, and measuring the sound pressure level of the corona noise generated by the standard hardware at a measuring point at each air pressure value; the multiple air pressure values ​​include a standard atmospheric pressure value; based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measuring point corresponding to the multiple air pressure values, calculating the sound power level parameter of the corona noise of the standard hardware corresponding to each air pressure value; based on the sound power level parameter, determining the sound power correction coefficient corresponding to each air pressure value, and calculating the sound power parameters of different air pressure values ​​based on the sound power correction coefficient.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid environmental protection, and more particularly to a corona noise measurement method and system under different air pressure conditions. Background Art

[0002] The planning, design, and environmental impact assessment of UHV AC transmission and transformation projects require prediction and calculation of the substation's acoustic impact. Currently, design firms and environmental impact assessment agencies often use commercial noise prediction software such as SoundPLAN or Cadna / A to predict and calculate substation acoustic environments. However, these existing commercial noise prediction software lacks a dedicated calculation module for substation noise. The results obtained using industrial noise modules differ significantly from measured results. Analysis of measured noise levels at UHV substation boundaries in low-altitude areas reveals that many substations at high risk of exceeding standards have a significant contribution from corona noise. However, noise predictions for substations at low altitudes often fail to consider corona noise, leading to frequent noise levels exceeding standards at UHV substations. Furthermore, low air density reduces the attenuation of noise during transmission. To ensure the environmental friendliness of substation noise at high altitudes and improve the accuracy of noise predictions at these locations, it is necessary to consider not only corona noise from hardware but also the impact of altitude on the noise attenuation characteristics of hardware.

[0003] Therefore, a technology is needed to measure the corona noise of hardware under different air pressure conditions. Summary of the Invention

[0004] The technical solution of the present invention provides a method and system for measuring corona noise under different air pressure conditions, so as to solve the problem of how to measure the corona noise of hardware under different air pressure conditions.

[0005] In order to solve the above problems, the present invention provides a method for measuring corona noise under different air pressure conditions, the method comprising:

[0006] Applying voltage to the standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge;

[0007] After the standard hardware generates a stable corona discharge, the voltage applied to the standard hardware is kept constant, the closed environment in which the standard hardware is located is adjusted to multiple air pressure values, and the sound pressure level of the corona noise generated by the standard hardware at the measurement point is measured at each air pressure value; the multiple air pressure values ​​include the standard atmospheric pressure value;

[0008] Calculating the sound power level parameter of the corona noise of the standard hardware corresponding to each air pressure value based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to the multiple air pressure values;

[0009] Based on the sound power level parameter, a sound power correction coefficient corresponding to each air pressure value is determined, and based on the sound power correction coefficient, sound power parameters of different air pressure values ​​are calculated.

[0010] Preferably, after applying voltage to the standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge, the method further comprises:

[0011] After the standard hardware generates a stable corona discharge, measuring the number N of corona discharge photons generated by the standard hardware at a measuring point under standard atmospheric pressure;

[0012] Adjusting the voltage applied to the standard hardware to maintain the number N of corona discharge photons generated by the standard hardware, adjusting the closed environment in which the standard hardware is located to multiple air pressure values, and measuring the sound pressure level of the corona noise generated by the standard hardware at the measurement point at each air pressure value; the multiple air pressure values ​​include the standard atmospheric pressure value;

[0013] Based on multiple sound pressure levels of corona noise generated by the standard hardware at a measurement point corresponding to multiple air pressure values, an attenuation coefficient of the corona noise at each air pressure value is calculated.

[0014] Preferably, the multiple air pressure values ​​also include: the air pressure value corresponding to an altitude of 1000m, the air pressure value corresponding to an altitude of 2000m, the air pressure value corresponding to an altitude of 3000m, the air pressure value corresponding to an altitude of 4000m, and the air pressure value corresponding to an altitude of 5000m.

[0015] Preferably, the calculating of the sound power level parameter of the corona noise of the standard hardware corresponding to each air pressure value based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to the multiple air pressure values ​​includes:

[0016] When the frequency of corona noise does not exceed 2kHz, the sound power level parameters of corona noise are:

[0017]

[0018] When the frequency of corona noise is not less than 2kHz, the sound power level parameters of corona noise are:

[0019]

[0020] in, is the average sound pressure level of the closed environment where the standard hardware is located, αS is the total absorption in the closed environment where the standard hardware is located, m is the air absorption attenuation coefficient, and V is the volume of the closed environment where the standard hardware is located.

[0021] Preferably, determining the sound power correction coefficient corresponding to each air pressure value based on the sound power level parameter includes:

[0022] The sound power correction factor is:

[0023] p i =(L w(i+1) -L wi )

[0024] Preferably, the step of calculating the attenuation coefficient of the corona noise at each air pressure value based on multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to multiple air pressure values ​​includes:

[0025] m i =(L s(i+1) -L si ) / r

[0026] Among them, L s(i+1) is the sound pressure level corresponding to the i+1th air pressure value, L si is the sound pressure level corresponding to the i-th air pressure value.

[0027] According to another aspect of the present invention, a corona noise measurement system under different air pressure conditions is provided, the system comprising: a high-voltage test power supply, a bushing, a high-pressure air tank, standard hardware, an acoustic sensor, an observation window, an ultraviolet imager, a data collector, and an analysis unit;

[0028] The ultraviolet imager observes the corona discharge of the standard hardware through the observation window;

[0029] The high-voltage test power supply is connected to the high-pressure air tank through a bushing to discharge the standard hardware;

[0030] Applying voltage to the standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge;

[0031] After the ultraviolet imager observes that the standard hardware generates a stable corona discharge, the voltage applied to the standard hardware is kept constant, and the closed environment of the high-pressure air tank in which the standard hardware is located is adjusted to multiple air pressure values. The sound pressure level of the corona noise generated by the standard hardware at the measuring point at each air pressure value measured by the acoustic sensor is collected by a data collector; the multiple air pressure values ​​include a standard atmospheric pressure value;

[0032] The analysis unit is used to calculate the sound power level parameters of the corona noise of the standard hardware corresponding to each air pressure value based on multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to multiple air pressure values; determine the sound power correction coefficient corresponding to each air pressure value based on the sound power level parameters, and calculate the sound power parameters of different air pressure values ​​based on the sound power correction coefficients.

[0033] Preferably, after applying voltage to the standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge, the system is further configured to:

[0034] After the standard hardware generates a stable corona discharge, measuring the number N of corona discharge photons generated by the standard hardware at a measuring point under standard atmospheric pressure;

[0035] Adjusting the voltage applied to the standard hardware to maintain the number N of corona discharge photons generated by the standard hardware, adjusting the closed environment in which the standard hardware is located to multiple air pressure values, and measuring the sound pressure level of the corona noise generated by the standard hardware at the measurement point at each air pressure value; the multiple air pressure values ​​include the standard atmospheric pressure value;

[0036] Based on multiple sound pressure levels of corona noise generated by the standard hardware at a measurement point corresponding to multiple air pressure values, an attenuation coefficient of the corona noise at each air pressure value is calculated.

[0037] Preferably, the multiple air pressure values ​​also include: the air pressure value corresponding to an altitude of 1000m, the air pressure value corresponding to an altitude of 2000m, the air pressure value corresponding to an altitude of 3000m, the air pressure value corresponding to an altitude of 4000m, and the air pressure value corresponding to an altitude of 5000m.

[0038] Preferably, the calculating of the sound power level parameter of the corona noise of the standard hardware corresponding to each air pressure value based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to the multiple air pressure values ​​includes:

[0039] When the frequency of corona noise does not exceed 2kHz, the sound power level parameters of corona noise are:

[0040]

[0041] When the frequency of corona noise is not less than 2kHz, the sound power level parameters of corona noise are:

[0042]

[0043] in, is the average sound pressure level of the closed environment where the standard hardware is located, αS is the total absorption in the closed environment where the standard hardware is located, m is the air absorption attenuation coefficient, and V is the volume of the closed environment where the standard hardware is located.

[0044] Preferably, determining the sound power correction coefficient corresponding to each air pressure value based on the sound power level parameter includes:

[0045] The sound power correction factor is:

[0046] p i =(Lw(i+1) -L wi )

[0047] Preferably, the step of calculating the attenuation coefficient of the corona noise at each air pressure value based on multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to multiple air pressure values ​​includes:

[0048] m i =(L s(i+1) -L si ) / r

[0049] Among them, L s(i+1) is the sound pressure level corresponding to the i+1th air pressure value, L si is the sound pressure level corresponding to the i-th air pressure value.

[0050] The technical solution of the present invention provides a corona noise measurement method and system under different air pressure conditions, the method comprising: applying voltage to a standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge; after the standard hardware generates the stable corona discharge, keeping the voltage applied to the standard hardware unchanged, adjusting the closed environment in which the standard hardware is located to multiple air pressure values, and measuring the sound pressure level of the corona noise generated by the standard hardware at the measurement point at each air pressure value; the multiple air pressure values ​​include a standard atmospheric pressure value; based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to the multiple air pressure values, calculating the sound power level parameters of the corona noise of the standard hardware corresponding to each air pressure value; based on the sound power level parameters, determining the sound power correction coefficient corresponding to each air pressure value, and calculating the sound power parameters of different air pressure values ​​based on the sound power correction coefficient. The technical solution of the present invention proposes an altitude correction method for the corona noise of hardware fittings based on a high-pressure air tank, which can solve problems such as the sound source model of the corona noise of hardware fittings in high-altitude areas and the influence law of corona noise attenuation, thereby improving the noise prediction accuracy of substations in high-altitude areas, which is of great significance for protecting the fragile ecological environment of the plateau. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0052] Figure 1 Flow chart of a method for measuring corona noise under different air pressure conditions according to a preferred embodiment of the present invention;

[0053] Figure 2 2. A structural diagram of a corona noise measurement system under different air pressure conditions according to a preferred embodiment of the present invention;

[0054] Figure 3 A flow chart of an altitude correction coefficient for the sound power of corona noise of hardware according to a preferred embodiment of the present invention; and

[0055] Figure 4 The figure is a flow chart of the altitude correction coefficient for attenuation of corona noise of hardware according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0056] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0057] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that 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.

[0058] Figure 1 This is a flowchart of a corona noise measurement method under different air pressure conditions according to a preferred embodiment of the present invention. This invention proposes a method for measuring the sound source parameters and attenuation coefficient of hardware corona noise at different altitudes using a high-pressure air tank. This method accurately obtains the spectrum, specific sound source parameters, and attenuation characteristics of hardware corona noise at different altitudes, thereby deriving an altitude correction method for the sound power parameters and attenuation coefficient of substation hardware noise.

[0059] like Figure 1 As shown, the present invention provides a method for measuring corona noise under different air pressure conditions, the method comprising:

[0060] Step 101: applying voltage to the standard hardware to perform a corona test, so that the standard hardware generates a stable corona discharge;

[0061] The present invention selects typical hardware of ultra-high voltage substations and conducts corona tests in a pressure tank. The specific test method refers to the standard hardware corona test method DL / T 1178 "1000kV AC transmission line hardware corona and radio interference test method" to conduct the corona test. The corona condition of the hardware surface is observed with an ultraviolet imager until stable corona discharge occurs on the hardware surface.

[0062] Step 102: After the standard hardware generates a stable corona discharge, the voltage applied to the standard hardware is kept unchanged, the closed environment in which the standard hardware is located is adjusted to multiple air pressure values, and the sound pressure level of the corona noise generated by the standard hardware at the measurement point under each air pressure value is measured; the multiple air pressure values ​​include the standard atmospheric pressure value; preferably, the multiple air pressure values ​​also include: the air pressure value corresponding to an altitude of 1000m, the air pressure value corresponding to an altitude of 2000m, the air pressure value corresponding to an altitude of 3000m, the air pressure value corresponding to an altitude of 4000m, and the air pressure value corresponding to an altitude of 5000m.

[0063] Step 103: Calculating a sound power level parameter of the corona noise of the standard hardware corresponding to each air pressure value based on multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to multiple air pressure values;

[0064] Preferably, based on multiple sound pressure levels of corona noise generated by standard hardware corresponding to multiple air pressure values ​​at a measurement point, calculating the sound power level parameter of the corona noise of the standard hardware corresponding to each air pressure value includes:

[0065] When the frequency of corona noise does not exceed 2kHz, the sound power level parameters of corona noise are:

[0066]

[0067] When the frequency of corona noise is not less than 2kHz, the sound power level parameters of corona noise are:

[0068]

[0069] in, is the average sound pressure level of the closed environment where the standard hardware is located, αS is the total absorption in the closed environment where the standard hardware is located, m is the air absorption attenuation coefficient, and V is the volume of the closed environment where the standard hardware is located.

[0070] like Figure 3 As shown, in step 103-1 of the present invention, the air pressure is set to standard atmospheric pressure. When the metal fitting generates a stable corona in step 102, the noise generated by the corona of the metal fitting is measured by a noise measurement system. The sound pressure level of the corona noise generated by the metal fitting measured at a distance r is L p0 .

[0071] In step 103-2, keep the voltage applied to the metal fitting unchanged, adjust the atmospheric pressure of the high-pressure air tank to the corresponding pressure values ​​at altitudes of 1000m, 2000m, 3000m, 4000m and 5000m, and then measure the sound pressure level L of the corona noise generated by the metal fitting under different pressure conditions. pi , i=1,2,3,4,5. When measuring, select 5 different positions for measurement and then calculate the average sound pressure level When measuring air pressure conditions at different altitudes, the air extraction device needs to be stopped in order to avoid the noise of the air pressure regulating device in the air pressure tank.

[0072] The present invention obtains data from measurements of 103-1 and 103-2, and inversely calculates the sound power level parameter LWi of the hardware corona corresponding to different altitude conditions. For frequencies below 2kHz, formula (1) is used for calculation; for frequencies greater than 2kHz, formula (2) is used for calculation;

[0073]

[0074]

[0075] in the formula is the average sound pressure level in the high-pressure air tank, dB; αS is the total absorption in the high-pressure air tank, m 2 ; m is the air absorption attenuation coefficient; V is the volume of the high-pressure air tank, m 3 ;

[0076] Step 104: Determine a sound power correction coefficient corresponding to each air pressure value based on the sound power level parameter, and calculate the sound power parameters of different air pressure values ​​based on the sound power correction coefficient.

[0077] Preferably, determining the sound power correction coefficient corresponding to each air pressure value based on the sound power level parameter includes:

[0078] The sound power correction factor is:

[0079] p i =(L w(i+1) -L wi )

[0080] The present invention processes the sound power parameters at different altitudes measured in step 103-3 by formula (2) to obtain the correction coefficient p of the sound power parameters at different altitudes. i ;

[0081] p i =(L w(i+1) -L wi )

[0082] Preferably, after applying voltage to the standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge, the method further includes:

[0083] After the standard hardware generates a stable corona discharge, measure the number N of corona discharge photons generated by the standard hardware at the measuring point under standard atmospheric pressure.

[0084] The voltage applied to the standard hardware is adjusted to maintain the number N of corona discharge photons generated by the standard hardware, the closed environment in which the standard hardware is located is adjusted to multiple air pressure values, and the sound pressure level of the corona noise generated by the standard hardware at the measurement point is measured at each air pressure value; the multiple air pressure values ​​include the standard atmospheric pressure value;

[0085] Based on multiple sound pressure levels of corona noise generated by standard hardware at the measurement point corresponding to multiple air pressure values, the attenuation coefficient of the corona noise at each air pressure value is calculated.

[0086] Preferably, based on multiple sound pressure levels of corona noise generated by standard hardware at a measurement point corresponding to multiple air pressure values, calculating the attenuation coefficient of the corona noise at each air pressure value includes:

[0087] m i =(L s(i+1) -L si ) / r

[0088] Among them, L s(i+1) is the sound pressure level corresponding to the i+1th air pressure value, L si is the sound pressure level corresponding to the i-th air pressure value.

[0089] The invention provides a method for adjusting the altitude of the attenuation coefficient of corona noise of hardware.

[0090] like Figure 4 As shown, the present invention repeats step 103-1 at 105-1 to obtain the sound pressure level L at the specific location of the hardware r under standard atmospheric pressure. s0 , and at the same time, use an ultraviolet imager to observe its corona linearity and record the number of photons N observed by the ultraviolet imager;

[0091] In step 105-2, the present invention adjusts the atmospheric pressure of the high-pressure air tank to the corresponding pressure value at an altitude of 1000m, and at the same time adjusts the voltage applied by the hardware, and observes the corona discharge through the ultraviolet imager. In order to keep the corona discharge degree of the hardware as close as possible to the corona state when the pressure is at the pressure value of 0 meters above sea level, it can be judged by the number of photons observed in the ultraviolet imager. When the number of photons is kept at N, the sound power parameter of the hardware corona discharge can be basically fixed. Then, the sound pressure level L of the noise generated by the hardware corona at a distance r is measured. s1 ;

[0092] In step 105-3, step 105-2 is repeated to complete the sound pressure level measurement at an altitude of 2000m, 3000m, 4000m and 5000m respectively, thereby obtaining the sound pressure level L at a distance r from the sound source under different altitude conditions. si , i=2,3,4,5;

[0093] In step 105-4, repeat step 105-3 to obtain noise data. The attenuation coefficient m of corona noise at different altitudes can be calculated using formula (4): i , i=0,1,2,3,4,5;

[0094] m i =(L s(i+1) -L si ) / r

[0095] The present invention proposes a testing method for the sound source parameters and attenuation characteristics of hardware corona noise based on a high-pressure air tank, which solves the problem that the altitude correction of hardware corona noise cannot be measured. At the same time, by correcting the sound power parameters and attenuation characteristics of hardware corona noise at altitude, the accuracy of noise prediction in substations in high-altitude areas can be greatly improved, providing a technical means for noise reduction in substations in high-altitude areas, and having good economic and environmental benefits.

[0096] Figure 2 1 is a structural diagram of a corona noise measurement system under different air pressure conditions according to a preferred embodiment of the present invention.

[0097] like Figure 2 As shown, the present invention provides a corona noise test system based on a high-pressure air tank. The system includes a high-voltage power supply device, an air tank, an air pressure conditioner, an ultraviolet imager, a noise test system and other equipment. The entire system is composed of Figure 2 As shown in the figure, a high-voltage test power supply is connected to the pressure tank via a wall bushing, supplying power to the surface of the fitting to generate corona discharge. A UV imager observes the corona onset through an observation window on the pressure tank. A pressure regulator adjusts the pressure in the pressure tank. The noise test system, consisting of sensors, a data logger, and a portable computer, is used to measure the corona noise generated by the fitting.

[0098] like Figure 2 As shown, the present invention provides a corona noise measurement system under different air pressure conditions, the system comprising: a high-voltage test power supply, a bushing, a high-pressure air tank, standard hardware, an acoustic sensor, an observation window, an ultraviolet imager, a data collector, and an analysis unit;

[0099] The ultraviolet imager observes the corona discharge of the standard metal fixture through the observation window;

[0100] The high-voltage test power supply is connected to the high-pressure gas tank through the bushing to discharge the standard hardware;

[0101] Apply voltage to the standard hardware to perform corona test, so that the standard hardware generates stable corona discharge;

[0102] After the UV imager observes that the standard hardware generates a stable corona discharge, the voltage applied to the standard hardware is maintained constant, and the sealed environment of the high-pressure air tank in which the standard hardware is located is adjusted to multiple air pressure values. The sound pressure level of the corona noise generated by the standard hardware at the measurement point at each air pressure value measured by the acoustic sensor is collected by a data collector; the multiple air pressure values ​​include the standard atmospheric pressure value;

[0103] Preferably, the multiple air pressure values ​​also include: the air pressure value corresponding to an altitude of 1000m, the air pressure value corresponding to an altitude of 2000m, the air pressure value corresponding to an altitude of 3000m, the air pressure value corresponding to an altitude of 4000m, and the air pressure value corresponding to an altitude of 5000m.

[0104] The analysis unit is used to calculate the sound power level parameters of the corona noise of the standard hardware corresponding to each air pressure value based on multiple sound pressure levels of corona noise generated by the standard hardware corresponding to multiple air pressure values ​​at the measurement point; determine the sound power correction coefficient corresponding to each air pressure value based on the sound power level parameters, and calculate the sound power parameters of different air pressure values ​​based on the sound power correction coefficient.

[0105] Preferably, based on multiple sound pressure levels of corona noise generated by standard hardware corresponding to multiple air pressure values ​​at a measurement point, calculating the sound power level parameter of the corona noise of the standard hardware corresponding to each air pressure value includes:

[0106] When the frequency of corona noise does not exceed 2kHz, the sound power level parameters of corona noise are:

[0107]

[0108] When the frequency of corona noise is not less than 2kHz, the sound power level parameters of corona noise are:

[0109]

[0110] in, is the average sound pressure level of the closed environment where the standard hardware is located, αS is the total absorption in the closed environment where the standard hardware is located, m is the air absorption attenuation coefficient, and V is the volume of the closed environment where the standard hardware is located.

[0111] Preferably, determining the sound power correction coefficient corresponding to each air pressure value based on the sound power level parameter includes:

[0112] The sound power correction factor is:

[0113] p i =(L w(i+1) -L wi )

[0114] Preferably, after applying voltage to the standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge, the system is further configured to:

[0115] After the standard hardware generates a stable corona discharge, measure the number N of corona discharge photons generated by the standard hardware at the measuring point under standard atmospheric pressure.

[0116] The voltage applied to the standard hardware is adjusted to maintain the number N of corona discharge photons generated by the standard hardware, the closed environment in which the standard hardware is located is adjusted to multiple air pressure values, and the sound pressure level of the corona noise generated by the standard hardware at the measurement point is measured at each air pressure value; the multiple air pressure values ​​include the standard atmospheric pressure value;

[0117] Based on multiple sound pressure levels of corona noise generated by standard hardware at the measurement point corresponding to multiple air pressure values, the attenuation coefficient of the corona noise at each air pressure value is calculated.

[0118] Preferably, after applying voltage to the standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge, the system is further configured to:

[0119] After the standard hardware generates a stable corona discharge, measure the number N of corona discharge photons generated by the standard hardware at the measuring point under standard atmospheric pressure.

[0120] The voltage applied to the standard hardware is adjusted to maintain the number N of corona discharge photons generated by the standard hardware, the closed environment in which the standard hardware is located is adjusted to multiple air pressure values, and the sound pressure level of the corona noise generated by the standard hardware at the measurement point is measured at each air pressure value; the multiple air pressure values ​​include the standard atmospheric pressure value;

[0121] Based on multiple sound pressure levels of corona noise generated by standard hardware at the measurement point corresponding to multiple air pressure values, the attenuation coefficient of the corona noise at each air pressure value is calculated.

[0122] Preferably, based on multiple sound pressure levels of corona noise generated by standard hardware at a measurement point corresponding to multiple air pressure values, calculating the attenuation coefficient of the corona noise at each air pressure value includes:

[0123] m i =(L s(i+1) -L si ) / r

[0124] Among them, L s(i+1) is the sound pressure level corresponding to the i+1th air pressure value, L si is the sound pressure level corresponding to the i-th air pressure value.

[0125] The corona noise testing system based on a high-pressure air tank provided by one embodiment of the present invention corresponds to the corona noise testing method based on a high-pressure air tank provided by another embodiment of the present invention, and will not be described in detail here.

[0126] It will be understood by those skilled in the art that the 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. Furthermore, 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. The solutions in the embodiments of the present invention may be implemented in various computer languages, for example, the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0127] 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 flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, 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 flowcharts and / or block diagrams. 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.

[0128] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work 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 The function specified in one or more boxes.

[0129] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device 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.

[0130] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0131] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

[0132] 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.

[0133] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / / the [means, component, etc.]" are to be interpreted openly as referring to at least one instance of a means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily need to be performed in the exact order disclosed, unless explicitly stated otherwise.

Claims

1. A method for measuring corona noise under different air pressure conditions, the method comprising: Applying voltage to the standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge; After the standard hardware generates a stable corona discharge, the voltage applied to the standard hardware is kept constant, the closed environment in which the standard hardware is located is adjusted to multiple air pressure values, and the sound pressure level of the corona noise generated by the standard hardware at the measurement point is measured at each air pressure value; the multiple air pressure values ​​include the standard atmospheric pressure value; Calculating the sound power level parameter of the corona noise of the standard hardware corresponding to each air pressure value based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to the multiple air pressure values; Determining a sound power correction coefficient corresponding to each air pressure value based on the sound power level parameter, and calculating the sound power parameters of different air pressure values ​​based on the sound power correction coefficient; After applying voltage to the standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge, the method further includes: After the standard hardware generates a stable corona discharge, measuring the number N of corona discharge photons generated by the standard hardware at a measuring point under standard atmospheric pressure; The voltage applied to the standard hardware is adjusted to maintain the number N of corona discharge photons generated by the standard hardware, the closed environment in which the standard hardware is located is adjusted to multiple air pressure values, and the sound pressure level of the corona noise generated by the standard hardware at the measurement point at each air pressure value is measured; based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to the multiple air pressure values, the attenuation coefficient of the corona noise at each air pressure value is calculated.

2. The method according to claim 1, wherein the plurality of air pressure values ​​further comprises: Air pressure values ​​at an altitude of 1000m, 2000m, 3000m, 4000m, and 5000m, respectively.

3. The method according to claim 1, wherein the step of calculating the sound power level parameter of the corona noise of the standard hardware corresponding to each air pressure value based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to the multiple air pressure values ​​comprises: When the frequency of corona noise does not exceed 2kHz, the sound power level parameters of corona noise are: When the frequency of corona noise is not less than 2kHz, the sound power level parameters of corona noise are: in, is the average sound pressure level of the closed environment where the standard hardware is located, αS is the total absorption in the closed environment where the standard hardware is located, m is the air absorption attenuation coefficient, and V is the volume of the closed environment where the standard hardware is located.

4. The method according to claim 3, wherein determining the sound power correction coefficient corresponding to each air pressure value based on the sound power level parameter comprises: The sound power correction factor is: p i =(L w(i+1) -L wi )。 5. The method according to claim 1, wherein the step of calculating the attenuation coefficient of the corona noise at each air pressure value based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to the multiple air pressure values ​​comprises: m i =(L s(i+1) -L si ) / r Among them, L s(i+1) is the sound pressure level corresponding to the i+1th air pressure value, L si is the sound pressure level corresponding to the i-th air pressure value, and r is the distance.

6. A corona noise measurement system under different air pressure conditions, the system comprising: High-voltage test power supply, bushing, high-pressure gas tank, standard hardware, acoustic sensor, observation window, UV imager, data acquisition device and analysis unit; Applying voltage to the standard hardware to perform a corona test so that the standard hardware generates a stable corona discharge; The ultraviolet imager observes the corona discharge of the standard hardware through the observation window; The high-voltage test power supply is connected to the high-pressure air tank through a bushing to discharge the standard hardware; After the ultraviolet imager observes that the standard hardware generates a stable corona discharge, the voltage applied to the standard hardware is kept constant, and the closed environment of the high-pressure air tank in which the standard hardware is located is adjusted to multiple air pressure values. The sound pressure level of the corona noise generated by the standard hardware at the measuring point at each air pressure value measured by the acoustic sensor is collected by a data collector; the multiple air pressure values ​​include a standard atmospheric pressure value; An analyzing unit, configured to calculate a sound power level parameter of the corona noise of the standard hardware corresponding to each air pressure value based on a plurality of sound pressure levels of the corona noise generated by the standard hardware at a measurement point corresponding to a plurality of air pressure values; Determining a sound power correction coefficient corresponding to each air pressure value based on the sound power level parameter, and calculating the sound power parameters of different air pressure values ​​based on the sound power correction coefficient; After applying voltage to the standard hardware to perform the corona test so that the standard hardware generates a stable corona discharge, the system is further used to: After the standard hardware generates a stable corona discharge, measuring the number N of corona discharge photons generated by the standard hardware at a measuring point under standard atmospheric pressure; The voltage applied to the standard hardware is adjusted to maintain the number N of corona discharge photons generated by the standard hardware, the closed environment in which the standard hardware is located is adjusted to multiple air pressure values, and the sound pressure level of the corona noise generated by the standard hardware at the measurement point at each air pressure value is measured; based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to the multiple air pressure values, the attenuation coefficient of the corona noise at each air pressure value is calculated.

7. The system of claim 6, wherein the plurality of air pressure values ​​further comprises: Air pressure values ​​at an altitude of 1000m, 2000m, 3000m, 4000m, and 5000m, respectively.

8. The system according to claim 6, wherein the step of calculating the sound power level parameter of the corona noise of the standard hardware corresponding to each air pressure value based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to the multiple air pressure values ​​comprises: When the frequency of corona noise does not exceed 2kHz, the sound power level parameters of corona noise are: When the frequency of corona noise is not less than 2kHz, the sound power level parameters of corona noise are: in, is the average sound pressure level of the closed environment where the standard hardware is located, αS is the total absorption in the closed environment where the standard hardware is located, m is the air absorption attenuation coefficient, and V is the volume of the closed environment where the standard hardware is located.

9. The system according to claim 8, wherein determining the sound power correction coefficient corresponding to each air pressure value based on the sound power level parameter comprises: The sound power correction factor is: p i =(L w(i+1) -L wi )。 10. The system according to claim 6, wherein the step of calculating the attenuation coefficient of the corona noise at each air pressure value based on the multiple sound pressure levels of the corona noise generated by the standard hardware at the measurement point corresponding to the multiple air pressure values ​​comprises: m i =(L s(i+1) -L si ) / r Among them, L s(i+1) is the sound pressure level corresponding to the i+1th air pressure value, L si is the sound pressure level corresponding to the i-th air pressure value, and r is the distance.

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