CN106679797A - Paralleling-reactor sound-shield sound reduction measuring method and device - Google Patents
Paralleling-reactor sound-shield sound reduction measuring method and device Download PDFInfo
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Abstract
The invention provides a paralleling-reactor sound-shield sound reduction measuring method and device. The method includes: measuring first sound intensity level located at the first default distance of a paralleling reactor and calculating sound power level of the paralleling reactor according to the measured first sound intensity level; mounting a sound shield on the paralleling reactor, measuring second sound intensity level at the first default distance of the sound shield and calculating sound power level according to the measured second sound intensity level; determining difference value of the calculated sound power level of the paralleling reactor and the sound power level of the sound shield to be sound reduction of the paralleling-reactor sound shield. The sound reduction is calculated through measurement of the sound intensity levels, sound intensity which is a vector and has directionality is less prone to interference of outer environment, the measured sound intensity is more accurate and reliable, and accuracy in calculation of the sound reduction is improved.
Description
Technical Field
The invention relates to the technical field of transmission and transformation station engineering sound environment measurement, in particular to a method and a device for testing the sound insulation quantity of a sound insulation cover of a shunt reactor.
Background
The shunt reactor is generally connected between the end of the extra-high voltage transmission line and the ground to perform reactive compensation, but the noise radiated outwards by the shunt reactor is very loud. The sound insulation cover is a sound insulation structure which is commonly used, and in order to reduce the noise radiated outwards by the shunt reactor, the sound insulation cover is usually covered outside the shunt reactor.
The sound insulation capacity of the sound insulation cover determines the sound insulation capacity of the sound insulation cover. At present, the sound insulation measurement of the totally-enclosed sound insulation cover of the shunt reactor is mainly obtained by measuring the sound pressure level difference in a high-voltage hall of a transformer substation or a reactor manufacturer. The specific method comprises the following steps:
(1) before the sound insulation cover is installed, sound pressure level of the paralleling reactor under the condition of electrifying is measured at a certain position or a plurality of positions 2-3 m away from the paralleling reactor, and the average sound pressure level of the paralleling reactor is obtained through calculation
(2) After the sound insulation cover is installed on the shunt reactor, the sound pressure level of the sound insulation cover is measured at the same position, and the average sound pressure level of the sound insulation cover is obtained through calculation
(3) Calculating the average sound pressure level of the shunt reactorAverage sound pressure level with sound-proof coverThe difference Δ p of (a) as the sound insulation amount of the sound insulation cover is represented by TL:
when the sound insulation amount of the sound insulation cover is calculated by adopting the sound pressure level difference method, the measured sound pressure level is easily interfered by other external sound sources, and the calculation accuracy of the sound insulation amount is directly influenced. In addition, the sound pressure level is measured at a position 2-3 m away from the parallel cable device or the sound insulation cover, so that the radiation area of noise is increased, and further the error of the calculated sound insulation amount of the sound insulation cover is larger.
Disclosure of Invention
In view of the above, the invention provides a method for testing the sound insulation quantity of a sound insulation cover of a shunt reactor, and aims to solve the problem that in the prior art, when the sound insulation quantity of the sound insulation cover is calculated by adopting a sound pressure level difference method, the calculation is inaccurate due to the fact that the sound insulation quantity is easily interfered by an external sound source. The invention provides a device for testing the sound insulation quantity of a sound insulation cover of a parallel reactor.
In one aspect, the invention provides a method for testing the sound insulation quantity of a sound insulation cover of a shunt reactor, which comprises the following steps: measuring a first sound intensity level at a first preset distance from the shunt reactor, and calculating the sound power level of the shunt reactor according to the measured first sound intensity level; installing an acoustic shield on the shunt reactor, measuring a second sound intensity level at a first preset distance away from the acoustic shield, and calculating the sound power level of the acoustic shield according to the measured second sound intensity level; and determining the difference value of the calculated sound power level of the shunt reactor and the calculated sound power level of the sound insulation cover as the sound insulation amount of the sound insulation cover of the shunt reactor.
Further, in the method for testing the sound insulation amount of the sound insulation cover of the parallel reactor, the first sound intensity level at a first preset distance from the parallel reactor is measured, and the sound power level of the parallel reactor is calculated according to the measured first sound intensity level, which includes: at least one first annular test unit surrounding the shunt reactor is arranged at a first preset distance away from the shunt reactor along the height direction of the shunt reactor, and each first annular test unit is provided with a plurality of first test points along the circumferential direction; sequentially determining a first sound intensity level of each first test point in each first annular test unit; calculating the average sound intensity level of the shunt reactor according to the first sound intensity level of each first test pointAccording to the calculated average sound intensity level of the shunt reactorCalculating the acoustic power level L of a shunt reactorW1。
Further, in the method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor, the average sound intensity level of the shunt reactor is calculatedThe method comprises the following steps: according to the formulaCalculating average sound intensity level of shunt reactorIn the above formula, N1Is the number of all first test points, L11 iIs the intensity level of the ith first test point.
Further, in the method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor, the sound insulation quantity is calculatedAverage sound intensity level of shunt reactorCalculating the acoustic power level L of a shunt reactorW1The method comprises the following steps: obtaining the height h of the oil tank of the parallel reactor1And the perimeter l of the annular cylindrical body where the first annular test unit is locatedm1(ii) a According to the height h of the oil tank1And a circumference lm1Calculating the side surface area S of the annular columnar body where the first annular test unit is positioned1(ii) a According to the formulaCalculating the acoustic power level L of a shunt reactorW1In the above formula, the first reaction mixture is,is the average sound intensity level of the shunt reactor.
Further, in the method for testing the sound insulation amount of the sound insulation cover of the parallel reactor, the sound insulation cover is installed on the parallel reactor, a second sound intensity level at a first preset distance from the sound insulation cover is measured, and the sound power level of the sound insulation cover is calculated according to the measured second sound intensity level, including: at least one second annular test unit surrounding the sound insulation cover is arranged at a first preset distance away from the sound insulation cover along the height direction of the sound insulation cover, and each second annular test unit is provided with a plurality of second test points along the circumferential direction; sequentially determining a second sound intensity level of each second test point in each second annular test unit; calculating the average sound intensity level of the sound insulation cover according to the second sound intensity level of each second test pointAccording to the calculated average sound intensity level of the sound insulation coverCalculating the sound power level L of the sound-insulating coverW2。
Further, in the method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor, the level of the sound insulation cover is calculatedUniform sound intensity levelThe method comprises the following steps: according to the formulaCalculating the average sound intensity level of the sound-proof coverIn the above formula, N2Is the number of all second test points, L12 iThe intensity level of the ith second test point.
Further, in the method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor, the average sound intensity level of the sound insulation cover is calculatedCalculating the sound power level L of the sound-insulating coverW2The method comprises the following steps: obtaining the height h of the sound-insulating cover2And the perimeter l of the annular cylinder where the second annular test unit is locatedm2(ii) a According to the height h of the sound-insulating cover2And a circumference lm2Calculating the side surface area S of the annular columnar body where the second annular test unit is located2(ii) a According to the formulaCalculating the sound power level L of the sound-insulating coverW2In the above formula, the first reaction mixture is,is the average sound intensity level of the sound-insulating cover.
In the invention, the sound intensity level is measured, the sound power level is calculated according to the sound intensity level, and the sound insulation quantity of the sound insulation cover of the shunt reactor is finally calculated, because the sound intensity is a vector and has directionality, the sound insulation cover is not easily interfered by the external environment, the measured sound intensity level is more accurate, the calculation accuracy of the sound insulation quantity is further improved, and the problem of inaccurate calculation caused by the interference of the external sound source when the sound insulation quantity of the sound insulation cover is calculated by adopting a sound pressure level difference method in the prior art is solved; in addition, the first sound intensity level of the shunt reactor and the second sound intensity level of the sound insulation cover are obtained by measurement under the same condition, so that the calculated sound insulation amount is more accurate and reliable.
On the other hand, the invention also provides a device for testing the sound insulation quantity of the sound insulation cover of the shunt reactor, which comprises the following components: the first sound power level calculation module is used for measuring a first sound intensity level at a first preset distance away from the shunt reactor and calculating the sound power level of the shunt reactor according to the measured first sound intensity level; the second sound power level calculation module is used for installing the sound insulation cover on the shunt reactor, measuring a second sound intensity level at a first preset distance away from the sound insulation cover, and calculating the sound power level of the sound insulation cover according to the measured second sound intensity level; and the sound insulation amount determining module is used for determining the calculated difference value between the sound power level of the shunt reactor and the sound power level of the sound insulation cover as the sound insulation amount of the sound insulation cover of the shunt reactor.
Further, in the sound insulation quantity testing device for the sound-proof cover of the shunt reactor, the first sound power level calculating module comprises: the first setting unit is used for at least arranging a first annular test unit surrounding the shunt reactor along the height direction of the shunt reactor at a first preset distance from the shunt reactor, and each first annular test unit is provided with a plurality of first test points along the circumferential direction; the first determining unit is used for sequentially measuring the first sound intensity level of each first test point in each first annular test unit; a first average sound intensity level unit for calculating the average sound intensity level of the shunt reactor according to the first sound intensity level of each first test pointA first sound power level unit for calculating the average sound intensity level of the shunt reactorCalculating the acoustic power level L of a shunt reactorW1。
Further, the sound insulation measurement of the sound insulation cover of the shunt reactorIn the trial apparatus, the second sound power level calculation module includes: the second setting unit is used for at least arranging a second annular test unit surrounding the sound insulation cover along the height direction of the sound insulation cover at a first preset distance away from the sound insulation cover, and each second annular test unit is provided with a plurality of second test points along the circumferential direction; the second determining unit is used for sequentially determining the second sound intensity level of each second test point in each second annular test unit; a second average sound intensity level unit for calculating the average sound intensity level of the sound-proof cover according to the measured second sound intensity level of each second test pointA second sound power level unit for calculating the average sound intensity level of the sound-proof coverCalculating the sound power level L of the sound-insulating coverW2。
The method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor has the advantages, so the device for testing the sound insulation quantity of the sound insulation cover of the shunt reactor also has corresponding technical effects.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a flowchart of a method for testing the sound insulation quantity of a sound insulation cover of a shunt reactor according to an embodiment of the present invention;
fig. 2 is another flowchart of a method for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention;
fig. 3 is another flowchart of a method for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention;
fig. 4 is another flowchart of a method for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention;
fig. 5 is another flowchart of a method for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a shunt reactor provided in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a first annular test unit in the method for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention;
fig. 8 is a block diagram of a structure of a device for testing the sound insulation amount of a sound insulation cover of a shunt reactor according to an embodiment of the present invention;
fig. 9 is a block diagram of another structure of the device for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention;
fig. 10 is a block diagram of still another structure of the device for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The method comprises the following steps:
referring to fig. 1, fig. 1 is a flowchart of a method for testing a sound insulation amount of a sound insulation cover of a shunt reactor according to an embodiment of the present invention. As shown in the figure, the method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor comprises the following steps:
a first sound power level calculating step S1 of measuring a first sound intensity level at a first preset distance from the shunt reactor, and calculating a sound power level of the shunt reactor according to the measured first sound intensity level.
Specifically, when the shunt reactor is not equipped with the sound-insulating cover, a first sound intensity level at a first preset distance of the shunt reactor is measured with the sound intensity probe at the position. The first preset distance may be 1m, 2m, or other values, which is not limited in this embodiment, however, in this embodiment, the first preset distance is 2m, and the sound intensity level is measured at this distance, which not only provides a space for the measurement of the sound intensity probe, but also enables the measured sound intensity level to be more accurate.
The first sound intensity level may be a weighted sound intensity level or a sound intensity level. The frequency band range of the first sound intensity level can be selected at will, and when the sound intensity probe measures the first sound intensity level, the frequency band range of the measurement can be selected, and the A-weighted sound intensity level or the sound intensity level can also be selected to be measured, so that the first sound intensity level measured by the sound intensity probe is the A-weighted sound intensity level or the sound intensity level of a certain frequency band, and correspondingly, the sound power level of the shunt reactor is the A-weighted sound power level or the sound power level of the frequency band. In this embodiment, the intensity probe measures the 1/3 times band of the first level of the a weight, and accordingly, the shunt reactor has a level of 1/3 times band of the a weight level of the sound power.
In specific implementation, the measurement frequency of the sound intensity probe may include 50Hz to 5000Hz, that is, the sound intensity probe may measure the sound intensity level and the total sound intensity level corresponding to any frequency of 50Hz to 5000 Hz. Correspondingly, the sound power level can also be the sound power level corresponding to any frequency of 50 Hz-5000 Hz and the total sound power level. In this embodiment, the sound intensity probe can measure the A-weighted sound intensity level of any 1/3 times frequency band from 50Hz to 5000 Hz.
And a second sound power level calculating step S2, mounting a sound insulation cover on the shunt reactor, measuring a second sound intensity level at a first preset distance from the sound insulation cover, and calculating the sound power level of the sound insulation cover according to the measured second sound intensity level.
Specifically, after the sound-insulating amount is installed, the second sound intensity level at the position is measured with the sound intensity probe at a first preset distance from the sound-insulating cover, that is, the distance from the sound-insulating cover when the second sound intensity level is measured is equal to the distance from the paralleling reactor when the first sound intensity level is measured. Of course, the first and second intensity levels are measured under the same conditions.
The second sound intensity level can be a weighted sound intensity level or a sound intensity level. The frequency band range of the second sound intensity level may be arbitrarily selected. However, the second intensity level should have the same frequency band range as the first intensity level, and if the first intensity level is a weighted intensity level, the second intensity level is also a weighted intensity level; if the first intensity level is an intensity level, then the second intensity level is also an intensity level. In this embodiment, the sound intensity probe measures the second sound intensity level of the 1/3 times frequency band, and accordingly, the sound power level of the sound-proof cover is 1/3 times frequency band of the second sound intensity level of the weight a.
And a sound insulation amount determining step S3, wherein the calculated difference value between the sound power level of the shunt reactor and the sound power level of the sound insulation cover is determined as the sound insulation amount of the sound insulation cover of the shunt reactor.
Specifically, the acoustic power level of the shunt reactor is denoted as LW1Let the sound power level of the sound-insulating cover be LW2When the sound insulation amount of the sound insulation cover of the shunt reactor is recorded as TL, TL is equal to delta LA＝LW1-LW2。
When the sound power level of the shunt reactor is calculated according to the total first sound intensity level, the sound power level of the shunt reactor is the total sound power level, correspondingly, the sound power level of the sound insulation cover is also calculated according to the total second sound intensity level, and the sound insulation amount of the sound insulation cover of the shunt reactor is the total sound insulation amount obtained by subtracting the total sound power level of the sound insulation cover from the total sound power level of the shunt reactor.
When the sound power level of the shunt reactor is calculated according to the first sound intensity level corresponding to a certain frequency, the sound power level of the shunt reactor is the sound power level of the frequency, correspondingly, the sound power level of the sound insulation cover is calculated according to the second sound intensity level of the frequency to obtain the sound power level of the frequency, and the sound insulation amount of the sound insulation cover of the shunt reactor is the sound insulation amount of the frequency obtained by subtracting the sound power level of the frequency of the sound insulation cover from the sound power level of the frequency of the shunt reactor. Thus, the sound insulation amount of the sound insulation cover of the shunt reactor corresponding to any frequency within 50 Hz-5000 Hz can be calculated. Generally speaking, the sound insulation amount of the sound insulation cover of the shunt reactor is the total sound insulation amount finally calculated according to the total sound intensity level.
It can be seen that, in the embodiment, the sound intensity level is measured, the sound power level is calculated according to the sound intensity level, and the sound insulation amount of the sound insulation cover of the shunt reactor is finally calculated, because the sound intensity is a vector and has directionality, the sound intensity is not easily interfered by the external environment, the measured sound intensity level is more accurate, the calculation accuracy of the sound insulation amount is further improved, and the problem of inaccurate calculation caused by the fact that the sound insulation amount of the sound insulation cover is easily interfered by the external sound source when a sound pressure level difference method is adopted for calculating the sound insulation amount in the prior art is solved; in addition, the first sound intensity level of the shunt reactor and the second sound intensity level of the sound insulation cover are obtained by measurement under the same condition, so that the calculated sound insulation amount is more accurate and reliable.
Referring to fig. 2, fig. 2 is another flowchart of a method for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention. As shown in the figure, a first sound intensity level at a first preset distance from the shunt reactor is measured, and the sound power level of the shunt reactor is calculated according to the measured first sound intensity level, that is, the first sound power level calculating step S1 further includes:
in the first setting substep S11, at least one first annular test cell surrounding the shunt reactor is disposed along a height direction of the shunt reactor at a first preset distance from the shunt reactor, and each first annular test cell is circumferentially provided with a plurality of first test points.
Specifically, referring to fig. 7, fig. 7 is a schematic structural diagram of the arrangement of the first annular test unit in the method for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention. The first ring test unit 4 may be plural, each of the first ring test units 4 is disposed in the height direction of the paralleling reactor 1, and the first ring test unit 4 surrounds one turn of the paralleling reactor. Each first ring-shaped test unit 4 comprises a plurality of first test points 5, and each first test point 5 surrounds a circle along the circumferential direction of the shunt reactor to form the first ring-shaped test unit 4. The first test points 5 are uniformly distributed along the circumferential direction of the shunt reactor, and the distance between two adjacent first test points 5 is equal, for example, the distance may be 1 m. The shape of the first annular test unit 4 is the same as that of the shunt reactor 1, that is, the shape of an annular cylindrical body where the first annular test unit 4 is located is the same as that of the shunt reactor 1, that is, the first test points 5 in each first annular test unit 4 are enclosed together to form an annular cylindrical body, and the shape of the annular cylindrical body is the same as that of the shunt reactor 1. The distance between the first annular testing unit and the shunt reactor is a first preset distance. The number of first test points 5 in each first ring-shaped test unit 4 is the same.
In this embodiment, the number of the first annular test units 4 is two, and if the height of the parallel reactor is recorded as h1Then two first ring test units are respectively arranged onAndto (3).
In specific implementation, if the position where the first test point 5 is arranged meets other obstacles, the arrangement position of the first test point 5 is adaptively modified, for example, the first test point 5 is arranged beside the obstacle.
The first determining substep S12 measures the first intensity level of each first test point in each first ring-shaped test cell in turn.
Specifically, the intensity probe is used to sequentially measure the first intensity level of each first test point 5 in each first ring-shaped test unit 4, and the measurement time for each first test point 5 can be set, for example: 1min, but the embodiment does not limit this. Before measurement, the frequency band range measured by the sound intensity probe can be selected, and whether the A-weighted sound intensity level or the sound intensity level is measured can also be selected.
In specific implementation, before measurement, the cooling fan 3 arranged on one side of the shunt reactor 1 is turned off to prevent noise generated by the cooling fan from influencing the measured sound intensity level.
A first average sound intensity level substep S13, calculating the average sound intensity level of the shunt reactor according to the determined first sound intensity level of each first test point
Specifically, the average sound intensity level of the shunt reactor is calculated according to the first sound intensity level meter of each first test pointThe method of (1) is arbitrary, and this embodiment does not limit this, and the present embodiment introduces one of the calculation methods as follows:
according to the formulaCalculating average sound intensity level of shunt reactorIn the above formula, N1Is the number of all first test points, L11 iIs the intensity level of the ith first test point. Wherein N is1The sum of all the first test points in all the first ring test units, for example, two first ring test units, each having 40 first test points, the number of all the first test points is: 80 in 40+40, i.e. N1＝80。
A first sound power level substep S14, based on the calculated average sound intensity level of the shunt reactorCalculating the acoustic power level L of a shunt reactorW1。
Specifically, the average sound intensity level of the shunt reactor calculated in the above-described first average sound intensity level substep S13Calculating the acoustic power level L of a shunt reactorW1The method of (2) is arbitrary, and this embodiment is not limited to this.
In the embodiment, the first sound intensity level is measured at each first test point in the first annular test unit, so that the calculation of the average sound intensity level can be effectively ensured to be accurate, the calculated sound power level is ensured to be accurate and reliable, and the calculation method is simple and accurate; in addition, the arrangement of the first test points in the first annular test unit can effectively reduce the measurement error caused by uneven distribution of the near-field sound field of the shunt reactor, and improve the measurement precision.
Referring to fig. 3, fig. 3 is another flowchart of a method for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention. For basis meterCalculated average sound intensity level of shunt reactorCalculating the acoustic power level L of a shunt reactorW1The present embodiment introduces one of the calculation methods, specifically, based on the calculated average sound intensity level of the shunt reactorCalculating the acoustic power level L of a shunt reactorW1Namely, the first sound power level sub-step S14 includes the following sub-steps:
the first obtaining substep S141 of obtaining the height h of the tank of the parallel reactor1And the perimeter l of the annular cylindrical body where the first annular test unit is locatedm1。
Specifically, referring to fig. 6, fig. 6 is a schematic structural diagram of a shunt reactor provided in an embodiment of the present invention. Measuring the height h of the oil tank of the shunt reactor by using a distance meter or other measuring equipment1. Perimeter l of annular cylindrical body where first annular test unit is locatedm1I.e. the circumference of the annular cylinder around which the first test points in any one of the first annular test cells are arranged, which can be measured by the measuring device. And each first annular test unit is positioned in the side surface of the same annular cylindrical body.
A first side surface area calculation substep S142, based on the tank height h1And a circumference lm1Calculating the side surface area S of the annular columnar body where the first annular test unit is positioned1。
Specifically, the annular cylindrical body where the first annular test unit is located is rectangular after being unfolded, and the area of the rectangle is the side surface area S of the annular cylindrical body where the first annular test unit is located1. Side surface area S1Is related to the first predetermined distance, i.e. the side surface area S is different when the first predetermined distance is different1The calculation formula of (c) is also different. For example, when the first preset distance is 2m, it mayAccording to the formula S1＝(h1+2)lm1To calculate the side surface area S1. When the first preset distance is other values, the side surface area S1The calculation formula of (a) will be changed accordingly.
A first calculation substep S143, based on the formulaCalculating the acoustic power level L of a shunt reactorW1In the above formula, the first reaction mixture is,is the average sound intensity level of the shunt reactor.
In particular, the average sound intensity level of the shunt reactorCalculated from the first average intensity level substep S13.
It can be seen that, in the embodiment, when the sound power level of the shunt reactor is calculated, the area of the side surface of the annular columnar body where the first annular test unit is located is taken into consideration, the change of the whole volume of the sound insulation cover after installation is fully considered, the calculation error is effectively reduced, and the sound insulation amount of the sound insulation cover of the shunt reactor is accurately and reliably calculated.
Referring to fig. 4, fig. 4 is another flowchart of a method for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention. As shown in the figure, the step S2 of installing the sound-proof cover on the shunt reactor, measuring the second sound intensity level at a first preset distance from the sound-proof cover, and calculating the sound power level of the sound-proof cover according to the measured second sound intensity level, that is, the step S2 of determining the second sound power level, further includes:
in the second setting substep S21, at least one second annular test unit surrounding the sound-proof cover is arranged along the height direction of the sound-proof cover at a first preset distance from the sound-proof cover, and each second annular test unit is provided with a plurality of second test points along the circumferential direction.
Specifically, the number of the second ring test units may be plural, each of the second ring test units is disposed along the height direction of the sound-proof cover, and the second ring test units surround the sound-proof cover by one turn. Each second annular test unit comprises a plurality of second test points, and each second test point surrounds a circle along the circumferential direction of the sound insulation cover to form the second annular test unit. The second test points are uniformly distributed along the circumferential direction of the sound-proof cover, and the distance between two adjacent second test points is equal, for example, the distance is 1 m. The shape of the second annular test unit is the same as that of the sound insulation cover, namely, the shape of the annular columnar body where the second annular test unit is located is the same as that of the sound insulation cover, namely, the second test points in each second annular test unit are surrounded to be the annular columnar body, and the shape of the annular columnar body is the same as that of the sound insulation cover. The distance between the second annular testing unit and the sound insulation cover is a first preset distance. The number of second test points in each second ring test unit is the same.
In this embodiment, the number of the second annular test units is two, and if the height of the oil tank of the sound insulation cover is recorded as h2Then two first ring test units are respectively arranged onAndto (3).
In specific implementation, if the position where the second test point is arranged meets other obstacles, the arrangement position of the second test point is adaptively modified, for example, the second test point is arranged beside the obstacle.
A second measurement substep S22, in turn, determines a second intensity level for each second test point in each second ring test cell.
Specifically, the second intensity level of each second test point in each second ring-shaped test unit is measured sequentially by the intensity probe, and the measurement time for each second test point may be set, for example: 1min, which is not limited in this embodiment. Before measurement, the frequency band range measured by the sound intensity probe can be selected, and whether the A-weighted sound intensity level or the sound intensity level is measured can also be selected.
In specific implementation, before measurement, the cooling fan 3 arranged on one side of the shunt reactor 1 is turned off to prevent noise generated by the cooling fan from influencing the measured sound intensity level.
A second average sound intensity level substep S23 of calculating an average sound intensity level of the sound shield based on the measured second sound intensity levels of the second test points
Specifically, the average sound intensity level of the sound-proof enclosure is calculated from the second sound intensity level meter of each second test pointThe method of (1) is arbitrary, and this embodiment does not limit this, and in this embodiment, one of the calculation methods is described as follows:
according to the formulaCalculating average sound intensity level of shunt reactorIn the above formula, N2Is the number of all first test points, L12 iIs the intensity level of the ith first test point. Wherein N is2Is the sum of all the second test points in all the second ring test units, and the first test point N1Is less than the second test point N2The number of the cells. For example, two second Ring testsAnd the unit comprises 50 second test points in each second annular test unit, and the number of all the second test points is as follows: 50+ 50-100, i.e. N2＝100。
A second sound power level substep S24 of calculating an average sound intensity level of the sound shieldCalculating the sound power level L of the sound-insulating coverW2。
Specifically, the average sound intensity level of the sound-proof enclosure calculated in the above-described second average sound intensity level substep S23Calculating the sound power level L of the sound-insulating coverW1The method of (2) is arbitrary, and this embodiment is not limited to this.
In the embodiment, the second sound intensity level is measured at each second test point in the second annular test unit, so that the calculation of the average sound intensity level can be effectively ensured to be accurate, the calculated sound power level is ensured to be accurate and reliable, and the calculation method is simple and accurate; in addition, the arrangement of each second test point in the second annular test unit can effectively reduce the measurement error caused by uneven distribution of the near-field sound field of the shunt reactor, and improve the measurement precision.
Referring to fig. 5, fig. 5 is another flowchart of a method for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention. For the average sound intensity level of the sound-proof cover calculated according to the calculationCalculating the sound power level L of the sound-insulating coverW1The present embodiment describes one of the calculation methods, specifically, the calculation method is based on the calculated average sound intensity level of the sound-proof coverCalculating the sound power level L of the sound-insulating coverW2I.e. the second sound power level sub-step S24, comprises the sub-steps of:
a second obtaining substep S241 of obtaining the height h of the acoustic shield2And the perimeter l of the annular cylinder where the second annular test unit is locatedm2。
In particular, the height h of the acoustic enclosure is measured using a range finder or other measuring device2. Perimeter l of annular cylindrical body where second annular test unit is locatedm2I.e. the circumference of the annular cylinder around which the second test points in any of the second annular test units are arranged, which can be measured by the measuring device. And each second annular test unit is positioned in the side surface of the same annular cylindrical body.
The second side surface area calculating substep S242, which is based on the height h of the sound-insulating cover2And a circumference lm2Calculating the side surface area S of the annular columnar body where the second annular test unit is located2。
Specifically, the annular cylindrical body where the second annular test unit is located is rectangular after being unfolded, and the area of the rectangle is the side surface area S of the annular cylindrical body where the second annular test unit is located2. Side surface area S2Is related to the first predetermined distance, i.e. the side surface area S is different when the first predetermined distance is different2The calculation formula of (c) is also different. For example, when the first preset distance is 2m, according to the formula S2＝(h2+2)lm2To calculate the side surface area S2. When the first preset distance is other values, the side surface area S2The calculation formula of (a) will be changed accordingly.
A second calculation substep S243, based on the formulaCalculating the sound power level L of the sound-insulating coverW2In the above formula, the first reaction mixture is,is the average sound intensity level of the sound-insulating cover.
In particular, the average sound intensity level of the sound-insulating coverCalculated from the second average intensity level substep S23.
It can be seen that, in the embodiment, when the sound power level of the sound insulation cover is calculated, the area of the side surface of the annular columnar body where the second annular testing unit is located is taken into consideration, the change of the whole volume of the sound insulation cover after installation is fully considered, the calculation error is effectively reduced, and the sound insulation amount of the sound insulation cover of the shunt reactor is accurately and reliably calculated.
The following describes a method for calculating the sound insulation amount of the sound insulation cover of the shunt reactor in detail. Wherein the first preset distance is 2 m. The measuring frequency of the sound intensity probe comprises 50Hz to 5000Hz, and the measured sound intensity level is 1/3 times of the A-weighted sound intensity level of the frequency band, and correspondingly, the sound power level is 1/3 times of the A-weighted sound power level of the frequency band.
First, when the shunt reactor is not equipped with the sound-insulating cover, the a-weighted sound power level of the 1/3-fold frequency band of the shunt reactor is calculated.
(1) Measuring the height h of the oil tank of the shunt reactor by using a distance measuring instrument1。
(2) Two first annular test units are arranged at a position 2m away from the shunt reactor and are respectively arranged inAndhere, the distance between the first test points of each ring-shaped test unit is 1 m.
(3) And ensuring that the shunt reactor normally operates under the rated voltage, and turning off the cooling fan 3. And sequentially measuring 1/3 times frequency band A weighted first sound intensity level for each first test point in each annular test unit by using a sound intensity probe, wherein the measurement time of each first test point is 1 min. The measuring frequency of the sound intensity probe comprises 50Hz to 5000Hz, namely the sound intensity probe measures any 1/3 times frequency band A weight first sound intensity level and total A weight first sound intensity level in the 50Hz to 5000 Hz.
(4) According to the formulaCalculating 1/3 octave band A weighted average sound intensity level of shunt reactorWherein N is1For the number of all first test points, L, in two ring-shaped test units1A1 iThe first intensity level is weighted for the 1/3 octave band a at the ith first test point.
(5) Measuring the perimeter l of the annular cylinder in which any one of the first annular test units is locatedm1And according to S1＝(h1+2)lm1Calculating the side surface area S of the annular columnar body where the first annular test unit is positioned1。
(6) According to the formulaCalculating 1/3 octave band A weighting sound power level L of shunt reactorWA1。
Then, when the shunt reactor is mounted on the sound-proof cover, the a-weighted sound power level of the 1/3-fold frequency band of the sound-proof cover is calculated.
(7) Measuring the height h of the acoustic enclosure with a distance meter2。
(8) Two second annular test units are arranged at a distance of 2m from the sound insulation cover and are respectively arrangedAndand the distance between the second test points of each annular test unit is 1 m.
(9) And ensuring that the shunt reactor normally operates under the rated voltage, and turning off the cooling fan 3. And sequentially measuring 1/3 times frequency band A weighted second sound intensity level for each second test point of each annular test unit by using a sound intensity probe, wherein the measurement time of each second test point is 1 min. The measuring frequency of the sound intensity probe comprises 50Hz to 5000Hz, namely, the sound intensity probe measures any 1/3 times frequency band A weight second sound intensity level and total A weight second sound intensity level within 50Hz to 5000 Hz.
(10) According to the formulaCalculating 1/3 octave band A weighted average sound intensity level of sound insulation coverWherein N is2For the number of all second test points, L, in the two ring-shaped test units1A2 iThe second intensity level is weighted for the 1/3 octave band a at the ith second test point.
(11) Measuring the perimeter l of the annular cylinder in which any one of the second annular test units is locatedm2And according to S2＝(h2+2)lm2Calculating the side surface area S of the annular columnar body where the second annular test unit is located2。
(12) According to the formulaCalculating 1/3 octave band A weighting sound power level L of sound insulation coverWA2。
Finally, the 1/3 times frequency band A of the shunt reactor is weighted by the sound power level LWA11/3 times frequency band A weighted sound power level L minus sound insulation coverWA2The sound insulation of the sound insulation cover of the shunt reactor is obtained and is marked as TL, namely TL is equal to delta LWA＝LWA1-LWA2。
Because the sound intensity probe can measure the A weighted sound intensity level of any 1/3 multiplied frequency band and the total A weighted sound intensity level within 50 Hz-5000 Hz, the sound insulation amount of the sound insulation cover of the shunt reactor of any 1/3 multiplied frequency band or the sound insulation amount of the sound insulation cover of the shunt reactor can be obtained by calculating the A weighted sound intensity level of any 1/3 multiplied frequency band or the total A weighted sound intensity level according to the method.
Since the acoustic energy of the high-voltage shunt reactor is mainly concentrated in the 1/3-fold frequency band with the center frequency of 100Hz, it is necessary to calculate the sound insulation amount of the sound insulation cover of the shunt reactor corresponding to the 1/3-fold frequency band with the center frequency of 100 Hz. The 1/3 times frequency band A weighting sound intensity level measured by the sound intensity probe at 100Hz is calculated according to the method.
In summary, in the embodiment, since the sound intensity is a vector and has directivity, the sound intensity is not easily interfered by an external environment, and the measured sound intensity level is more accurate, so that the accuracy of sound insulation calculation is improved; in addition, the first sound intensity level of the shunt reactor and the second sound intensity level of the sound insulation cover are obtained by measurement under the same condition, so that the calculated sound insulation amount is more accurate and reliable.
The embodiment of the device is as follows:
referring to fig. 8, fig. 8 is a block diagram of a structure of a device for testing the sound insulation amount of a sound insulation cover of a shunt reactor according to an embodiment of the present invention. The invention also provides a device for testing the sound insulation quantity of the sound insulation cover of the shunt reactor, which comprises the following components: a first sound power level calculation module 100, a second sound power level calculation module 200, and an amount of sound insulation determination module 300. Wherein,
the first sound power level calculating module 100 is configured to measure a first sound intensity level at a first preset distance from the shunt reactor, and calculate a sound power level of the shunt reactor according to the measured first sound intensity level.
The second sound power level calculation module 200 is configured to install an acoustic enclosure for the shunt reactor, measure a second sound intensity level at a first preset distance from the acoustic enclosure, and calculate a sound power level of the acoustic enclosure according to the measured second sound intensity level.
The sound insulation amount determining module 300 is configured to determine a difference between the calculated sound power level of the parallel reactor and the calculated sound power level of the sound insulation cover as the sound insulation amount of the sound insulation cover of the parallel reactor.
The specific implementation process of the apparatus may refer to the description in the above method embodiments, and the description of the embodiment is omitted here for brevity.
The method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor has the advantages, so the device for testing the sound insulation quantity of the sound insulation cover of the shunt reactor also has corresponding technical effects.
Referring to fig. 9, fig. 9 is a block diagram of another structure of the device for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention. As shown, the first sound power level calculation module 100 may include: a first setting unit 110, a first determining unit 120, a first average sound intensity level unit 130, and a first sound power level unit 140. Wherein,
the first setting unit 110 is configured to set at least one first annular test unit surrounding the parallel reactor in a height direction of the parallel reactor at a first preset distance from the parallel reactor, where each first annular test unit is provided with a plurality of first test points in a circumferential direction.
The first determining unit 120 is configured to measure the first sound intensity level of each first test point in each first ring-shaped test unit in turn.
The first average sound intensity level unit 130 is configured to calculate an average sound intensity level of the shunt reactor according to the first sound intensity level of each first test point
The first sound power level unit 140 is used for calculating the average sound intensity level of the shunt reactorCalculating the acoustic power level L of a shunt reactorW1。
In the above method embodiment, for specific implementation processes of the first setting unit 110, the first determining unit 120, the first average sound intensity level unit 130, and the first sound power level unit 140, reference may be made to the description of the first setting substep S11, the first determining substep S12, the first average sound intensity level substep S13, and the first sound power level substep S14, which is not repeated herein.
It can be seen that the method can effectively ensure accurate calculation of the average sound intensity level, further ensure accurate and reliable calculated sound power level, and the calculation method is simple and accurate; in addition, the arrangement of the first test points in the first annular test unit can effectively reduce the measurement error caused by uneven distribution of the near-field sound field of the shunt reactor, and improve the measurement precision.
Referring to fig. 10, fig. 10 is a block diagram of another structure of the device for testing the sound insulation amount of the sound insulation cover of the shunt reactor according to the embodiment of the present invention. The second acoustic power level calculation module 200 may include: a second setting unit 210, a second determining unit 220, a second average sound intensity level unit 230, and a second sound power level unit 240. Wherein,
the second setting unit 210 is configured to set at least one second annular test unit surrounding the sound-insulating cover in the height direction of the sound-insulating cover at a first preset distance from the sound-insulating cover, where each second annular test unit is provided with a plurality of second test points in the circumferential direction.
The second determining unit 220 is used for sequentially determining the second intensity level of each second testing point in each second ring-shaped testing unit.
The second average sound intensity level unit 230 is configured to calculate an average sound intensity level of the sound-proof enclosure according to the measured second sound intensity level of each second test point
The second sound power level unit 240 is used for calculating the average sound intensity level of the sound insulation coverCalculating the sound power level L of the sound-insulating coverW2。
In the embodiment, for specific implementation processes of the second setting unit 210, the second determining unit 220, the second average sound intensity level unit 230, and the second sound power level unit 240, reference may be made to the descriptions of the second setting substep S21, the second measuring substep S22, the second average sound intensity level substep S23, and the second sound power level substep S24 in the method embodiment, which is not repeated herein.
It can be seen that the method can effectively ensure accurate calculation of the average sound intensity level, further ensure accurate and reliable calculated sound power level, and the calculation method is simple and accurate; in addition, the arrangement of each second test point in the second annular test unit can effectively reduce the measurement error caused by uneven distribution of the near-field sound field of the shunt reactor, and improve the measurement precision.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for testing the sound insulation quantity of a sound insulation cover of a shunt reactor is characterized by comprising the following steps:
measuring a first sound intensity level at a first preset distance from the shunt reactor, and calculating the sound power level of the shunt reactor according to the measured first sound intensity level;
installing an acoustic shield on the shunt reactor, measuring a second sound intensity level at a first preset distance away from the acoustic shield, and calculating the sound power level of the acoustic shield according to the measured second sound intensity level;
and determining the difference value of the calculated sound power level of the shunt reactor and the calculated sound power level of the sound insulation cover as the sound insulation amount of the sound insulation cover of the shunt reactor.
2. The method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor according to claim 1, wherein the step of measuring a first sound intensity level at a first preset distance from the shunt reactor and calculating the sound power level of the shunt reactor according to the measured first sound intensity level comprises the following steps:
at least one first annular test unit surrounding the shunt reactor is arranged at a first preset distance away from the shunt reactor along the height direction of the shunt reactor, and each first annular test unit is provided with a plurality of first test points along the circumferential direction;
sequentially determining a first sound intensity level of each first test point in each first annular test unit;
calculating the average sound intensity level of the shunt reactor according to the first sound intensity level of each first test point
According to the calculated average sound intensity level of the shunt reactorCalculating the acoustic power level L of a shunt reactorW1。
3. The method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor according to claim 2, wherein the average sound intensity level of the shunt reactor is calculatedThe method comprises the following steps:
according to the formulaCalculating shunt reactanceMean sound level of the deviceIn the above formula, N1Is the number of all first test points, L11 iIs the intensity level of the ith first test point.
4. The method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor according to claim 2, wherein the average sound intensity level of the shunt reactor is calculated according to the calculated sound insulation quantityCalculating the acoustic power level L of a shunt reactorW1The method comprises the following steps:
obtaining the height h of the oil tank of the parallel reactor1And the perimeter l of the annular cylindrical body where the first annular test unit is positionedm1；
According to the height h of the oil tank1And a circumference lm1Calculating the side surface area S of the annular columnar body where the first annular test unit is positioned1；
According to the formulaCalculating the acoustic power level L of a shunt reactorW1In the above formula, the first reaction mixture is,is the average sound intensity level of the shunt reactor.
5. The method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor according to claim 1, wherein the steps of installing the sound insulation cover on the shunt reactor, measuring a second sound intensity level at a first preset distance from the sound insulation cover, and calculating the sound power level of the sound insulation cover according to the measured second sound intensity level comprise:
at least one second annular test unit surrounding the sound insulation cover is arranged at a first preset distance away from the sound insulation cover along the height direction of the sound insulation cover, and each second annular test unit is provided with a plurality of second test points along the circumferential direction;
sequentially determining a second sound intensity level of each second test point in each second annular test unit;
calculating the average sound intensity level of the sound insulation cover according to the second sound intensity level of each second test point
According to the calculated average sound intensity level of the sound insulation coverCalculating the sound power level L of the sound-insulating coverW2。
6. The method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor according to claim 5, wherein the average sound intensity level of the sound insulation cover is calculatedThe method comprises the following steps:
according to the formulaCalculating the average sound intensity level of the sound-proof coverIn the above formula, N2Is the number of all second test points, L12 iThe intensity level of the ith second test point.
7. The method for testing the sound insulation quantity of the sound insulation cover of the shunt reactor according to claim 5, wherein the average sound intensity level of the sound insulation cover is calculated according to the calculated average sound intensity levelCalculating the sound power level L of the sound-insulating coverW2The method comprises the following steps:
obtaining the height h of the sound-insulating cover2And the perimeter l of the annular cylindrical body where the second annular test unit is positionedm2；
According to the height h of the sound-proof cover2And a circumference lm2Calculating the side surface area S of the annular cylindrical body where the second annular test unit is positioned2；
According to the formulaCalculating the sound power level L of the sound-insulating coverW2In the above formula, the first reaction mixture is,is the average sound intensity level of the sound-insulating cover.
8. The utility model provides a shunt reactor sound insulation cover sound insulation volume testing arrangement which characterized in that includes:
the first sound power level calculation module is used for measuring a first sound intensity level at a first preset distance away from the shunt reactor and calculating the sound power level of the shunt reactor according to the measured first sound intensity level;
the second sound power level calculation module is used for installing the sound insulation cover on the shunt reactor, measuring a second sound intensity level at a first preset distance away from the sound insulation cover, and calculating the sound power level of the sound insulation cover according to the measured second sound intensity level;
and the sound insulation amount determining module is used for determining the calculated difference value between the sound power level of the shunt reactor and the sound power level of the sound insulation cover as the sound insulation amount of the sound insulation cover of the shunt reactor.
9. The device for testing the sound insulation quantity of the sound insulation cover of the shunt reactor according to claim 8, wherein the first sound power level calculating module comprises:
the first setting unit is used for at least arranging one first annular test unit surrounding the shunt reactor along the height direction of the shunt reactor at a first preset distance away from the shunt reactor, and each first annular test unit is provided with a plurality of first test points along the circumferential direction;
the first determining unit is used for sequentially measuring the first sound intensity level of each first test point in each first annular test unit;
a first average sound intensity level unit for calculating the average sound intensity level of the shunt reactor according to the first sound intensity level of each first test point
A first sound power level unit for calculating the average sound intensity level of the shunt reactorCalculating the acoustic power level L of a shunt reactorW1。
10. The device for testing the sound insulation quantity of the sound insulation cover of the shunt reactor according to claim 8, wherein the second sound power level calculating module comprises:
the second setting unit is used for at least arranging a second annular test unit surrounding the sound insulation cover along the height direction of the sound insulation cover at a first preset distance away from the sound insulation cover, and each second annular test unit is provided with a plurality of second test points along the circumferential direction;
the second determining unit is used for sequentially determining the second sound intensity level of each second test point in each second annular test unit;
a second average sound intensity level unit for calculating the average sound intensity level of the sound-proof cover according to the measured second sound intensity level of each second test point
A second sound power level unit for calculating the average sound intensity level of the sound-proof coverCalculating the sound power level L of the sound-insulating coverW2。
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