CN106679797A - Paralleling-reactor sound-shield sound reduction measuring method and device - Google Patents

Abstract

The invention provides a method and device for testing the sound insulation of a shunt reactor sound insulation cover, wherein the method includes the following steps: measuring the first sound intensity level at the first preset distance from the shunt reactor, and according to the measured Calculate the sound power level of the shunt reactor at the first sound intensity level; install a sound insulation cover on the shunt reactor, measure the second sound intensity level at the first preset distance from the sound insulation cover, and use the measured second sound intensity Calculate the sound power level of the sound insulation enclosure; determine the difference between the calculated sound power level of the shunt reactor and the sound power level of the sound insulation enclosure as the sound insulation of the shunt reactor sound insulation enclosure. In the present invention, the sound insulation is calculated by measuring the sound intensity level. Since the sound intensity is a vector and has directionality, it is not easily disturbed by the external environment, and the measured sound intensity level is more accurate and reliable, thereby improving the accuracy of the sound insulation calculation.

Description

Method and device for testing sound insulation of shunt reactor sound insulation cover

technical field

The invention relates to the technical field of sound environment measurement for power transmission and transformation station engineering, in particular to a method and device for testing the sound insulation of a shunt reactor sound insulation cover.

Background technique

The shunt reactor is generally connected between the end of the ultra-high voltage transmission line and the ground, and plays the role of reactive power compensation. However, the noise radiated from the shunt reactor is very large. The sound insulation cover is a commonly used sound insulation structure. In order to reduce the noise radiated from the shunt reactor, a sound insulation cover is usually provided outside the shunt reactor.

The sound insulation of the sound insulation enclosure determines the sound insulation ability of the sound insulation enclosure. At present, the measurement of the sound insulation of the fully enclosed sound insulation enclosure of the shunt reactor is mainly obtained by measuring the sound pressure level difference in the high voltage hall of the substation or the reactor manufacturer. The specific method is:

(1) Before installing the sound insulation enclosure, measure the sound pressure level of the shunt reactor when it is energized at a certain position or multiple positions 2 to 3m away from the shunt reactor, and calculate the average sound pressure level of the shunt reactor

(2) After installing the shunt reactor in the sound insulation cover, measure the sound pressure level of the sound insulation cover at the same position, and calculate the average sound pressure level of the sound insulation cover

(3) The calculated average sound pressure level of the shunt reactor Average sound pressure level with acoustic enclosure The difference Δp, as the sound insulation of the sound insulation enclosure, expressed in TL as:

When the above-mentioned method of sound pressure level difference is used to calculate the sound insulation of the sound insulation enclosure, the measured sound pressure level is easily interfered by other external sound sources, which directly affects the accuracy of the calculation of the sound insulation. In addition, the sound pressure level is measured at a distance of 2-3m from the parallel cable connector or the sound insulation cover, which increases the radiation area of the noise, which in turn leads to a large error in the calculated sound insulation of the sound insulation cover.

Contents of the invention

In view of this, the present invention proposes a method for testing the sound insulation of a shunt reactor sound insulation cover, aiming at solving the problem of inaccurate calculation caused by the interference of external sound sources when calculating the sound insulation of a sound insulation cover using the sound pressure level difference method in the prior art The problem. The invention provides a sound insulation test device for a shunt reactor sound insulation cover.

In one aspect, the present invention provides a method for testing the sound insulation of a shunt reactor sound insulation cover, the method comprising the following steps: measuring a first sound intensity level at a first preset distance from the shunt reactor, and according to the measured first sound intensity level Sound intensity level Calculate the sound power level of the shunt reactor; install the sound insulation cover on the shunt reactor, measure the second sound intensity level at the first preset distance from the sound insulation cover, and according to the measured second sound intensity level Calculate the sound power level of the sound insulation enclosure; determine the difference between the calculated sound power level of the shunt reactor and the sound power level of the sound insulation enclosure as the sound insulation of the shunt reactor sound insulation enclosure.

Further, in the above method for testing the sound insulation of the shunt reactor sound insulation cover, the first sound intensity level at the first preset distance from the shunt reactor is measured, and the sound intensity level of the shunt reactor is calculated according to the measured first sound intensity level. The power stage includes: at a first preset distance from the shunt reactor, at least one first annular test unit surrounding the shunt reactor is arranged along the height direction of the shunt reactor, and each first annular test unit is Set multiple first test points in the direction; determine the first sound intensity level of each first test point in each first ring test unit in turn; calculate the average value of the shunt reactor according to the first sound intensity level of each first test point Sound intensity level According to the calculated average sound intensity level of the shunt reactor Calculate the sound power level L _W1 of the shunt reactor.

Further, in the above test method for the sound insulation of the shunt reactor sound insulation cover, the average sound intensity level of the shunt reactor is calculated Including: According to the formula Calculate the average sound intensity level of a shunt reactor In the above formula, N ₁ is the number of all first test points, and L ₁₁ ⁱ is the sound intensity level of the i-th first test point.

Further, in the above test method for the sound insulation of the shunt reactor sound insulation cover, according to the calculated average sound intensity level of the shunt reactor Calculation of the sound power level L _W1 of the shunt reactor, including: obtaining the fuel tank height h ₁ of the shunt reactor and the circumference l _m1 of the annular cylinder where the first ring test unit is located; calculation based on the fuel tank height h ₁ and circumference l _m1 The side area S ₁ of the annular cylinder where the first annular test unit is located; according to the formula Calculate the sound power level L _W1 of the shunt reactor, in the above formula, is the average sound intensity level of the shunt reactor.

Further, in the above method for testing the sound insulation of shunt reactor sound insulation cover, install the sound insulation cover on the shunt reactor, measure the second sound intensity level at the first preset distance from the sound insulation cover, and according to the measured second The sound intensity level calculation of the sound power level of the sound insulation enclosure includes: at a first preset distance from the sound insulation enclosure, at least one second annular test unit surrounding the sound insulation enclosure is arranged along the height direction of the sound insulation enclosure, each The second ring-shaped test units are provided with a plurality of second test points in the circumferential direction; the second sound intensity level of each second test point in each second ring-shaped test unit is determined in turn; according to the second sound intensity level of each second test point Calculate the average sound intensity level of the sound insulation enclosure According to the calculated average sound intensity level of the sound enclosure Calculate the sound power level L _W2 of the sound enclosure.

Further, in the above test method for the sound insulation of the shunt reactor sound insulation cover, the average sound intensity level of the sound insulation cover is calculated Including: According to the formula Calculating the Average Sound Intensity Level for Acoustic Enclosures In the above formula, N ₂ is the number of all second test points, and L ₁₂ ⁱ is the sound intensity level of the i-th second test point.

Further, in the above test method for the sound insulation of the shunt reactor sound insulation enclosure, according to the calculated average sound intensity level of the sound insulation enclosure Calculate the sound power level L _W2 of the sound insulation enclosure, including: obtain the height h ₂ of the sound insulation enclosure and the perimeter l _m2 of the annular column where the second annular test unit is located; according to the height h ₂ and perimeter l of the sound insulation enclosure _m2 Calculate the side area S ₂ of the annular columnar body where the second annular test unit is located; according to the formula Calculate the sound power level L _W2 of the sound insulation enclosure, in the above formula, is the average sound intensity level of the sound enclosure.

In the present invention, by measuring the sound intensity level, and then calculating the sound power level according to the sound intensity level, the sound insulation of the shunt reactor sound insulation cover is finally calculated. Since the sound intensity is a vector and has directionality, it is not easily disturbed by the external environment , the measured sound intensity level is more accurate, thereby improving the accuracy of sound insulation calculation, and solving the problem of inaccurate calculation caused by external sound source interference when using the sound pressure level difference method to calculate the sound insulation of the sound insulation cover in the prior art Question; In addition, the first sound intensity level of the shunt reactor and the second sound intensity level of the sound insulation enclosure are measured under the same conditions, making the calculated sound insulation more accurate and reliable.

On the other hand, the present invention also proposes a sound insulation test device for a shunt reactor sound insulation cover, which includes: a first sound power level calculation module, used to measure the first sound power level at the first preset distance from the shunt reactor. sound intensity level, and calculate 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 to install the sound insulation cover on the shunt reactor, and measure the distance from the sound insulation cover to the first preset Set the second sound intensity level at the distance, and calculate the sound power level of the sound insulation enclosure according to the measured second sound intensity level; the sound insulation determination module is used to compare the calculated sound power level of the shunt reactor with the sound insulation The difference of the sound power level of the enclosure is determined as the sound insulation of the shunt reactor sound insulation enclosure.

Further, in the above-mentioned sound insulation cover test device for shunt reactors, the first sound power level calculation module includes: a first setting unit, for At least one first annular test unit surrounding the shunt reactor is arranged in the height direction, and each first annular test unit is provided with a plurality of first test points along the circumference; the first determination unit is used to sequentially measure each first The first sound intensity level of each first test point in the ring test unit; the first average sound intensity level unit, which is used to calculate the average sound intensity level of the shunt reactor according to the first sound intensity level of each first test point First sound power level unit for the calculated average sound intensity level of the shunt reactor Calculate the sound power level L _W1 of the shunt reactor.

Further, in the above-mentioned test device for sound insulation of shunt reactor sound insulation enclosures, the second sound power level calculation module includes: a second setting unit, for At least one second ring-shaped test unit surrounding the sound insulation enclosure is arranged in the height direction, and each second ring-shaped test unit is provided with a plurality of second test points along the circumference; the second determination unit is used to sequentially determine each second The second sound intensity level of each second test point in the ring test unit; the second average sound intensity level unit is used to calculate the average sound intensity of the sound insulation enclosure according to the measured second sound intensity level of each second test point class Second sound power level unit for the calculated average sound intensity level of the sound enclosure Calculate the sound power level L _W2 of the sound enclosure.

Since the method for testing the sound insulation of the shunt reactor sound insulation cover has the above effects, the sound insulation test device for the shunt reactor sound insulation cover also has corresponding technical effects.

Description of 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 embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same components. In the attached picture:

Fig. 1 is a flow chart of the method for testing the sound insulation of a shunt reactor sound insulation cover provided by an embodiment of the present invention;

Fig. 2 is another flow chart of the method for testing the sound insulation of the shunt reactor sound insulation cover provided by the embodiment of the present invention;

Fig. 3 is another flow chart of the method for testing the sound insulation of the shunt reactor sound insulation cover provided by the embodiment of the present invention;

Fig. 4 is another flow chart of the method for testing the sound insulation of the shunt reactor sound insulation cover provided by the embodiment of the present invention;

Fig. 5 is another flow chart of the method for testing the sound insulation of the shunt reactor sound insulation cover provided by the embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a shunt reactor provided by an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of the first annular test unit in the method for testing the sound insulation of the shunt reactor sound insulation cover provided by the embodiment of the present invention;

Fig. 8 is a structural block diagram of a sound insulation test device for a shunt reactor sound insulation cover provided by an embodiment of the present invention;

Fig. 9 is another structural block diagram of the sound insulation test device for the shunt reactor sound insulation cover provided by the embodiment of the present invention;

Fig. 10 is another structural block diagram of the sound insulation test device for the shunt reactor sound insulation cover provided by 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. Although 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 by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

Method example:

Referring to Fig. 1, Fig. 1 is a flowchart of a method for testing the sound insulation of a shunt reactor sound insulation cover provided by an embodiment of the present invention. As shown in the figure, the test method for the sound insulation of shunt reactor sound insulation cover includes the following steps:

The first sound power level calculation step S1 is to measure a first sound intensity level at a first preset distance from the shunt reactor, and calculate the sound power level of the shunt reactor according to the measured first sound intensity level.

Specifically, when the shunt reactor is not installed with a sound insulation cover, a sound intensity probe is used to measure the first sound intensity level at a first preset distance from the shunt reactor. The first preset distance can be 1m, 2m, or other values. This embodiment does not make any restrictions on this, but in this embodiment, the first preset distance is 2m, and the sound intensity is measured at this distance Level, not only can provide space for the measurement of the sound intensity probe, but also can make the measured sound intensity level more accurate.

The first sound intensity level may be an A-weighted sound intensity level or a sound intensity level. The frequency band range of the first sound intensity level can be selected arbitrarily, then when the sound intensity probe measures the first sound intensity level, the frequency band range of measurement can be selected, and the A-weighted sound intensity level or the sound intensity level can also be selected to be measured. Like this, The first sound intensity level measured by the sound intensity probe is the A-weighted sound intensity level or sound intensity level of a certain frequency band. Correspondingly, the sound power level of the shunt reactor is the A-weighted sound power level or sound power level of the frequency band. class. In this embodiment, the sound intensity probe measures the A-weighted first sound intensity level of the 1/3 octave band, and correspondingly, the sound power level of the shunt reactor is the A-weighted sound power of the 1/3 octave band class.

During specific implementation, the measurement frequency of the sound intensity probe may include 50 Hz-5000 Hz, that is, the sound intensity probe may measure the sound intensity level and the total sound intensity level corresponding to any frequency in 50 Hz-5000 Hz. Correspondingly, the sound power level may also be the sound power level corresponding to any frequency in 50Hz-5000Hz 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 octave band in 50Hz-5000Hz.

The second sound power level calculation step S2 is to install a sound insulation cover on the shunt reactor, measure the second sound intensity level at the first preset distance from the sound insulation cover, and calculate the sound insulation cover according to the measured second sound intensity level sound power level.

Specifically, after the sound insulation is installed, use a sound intensity probe to measure the second sound intensity level at this position at the first preset distance of the sound insulation enclosure, that is to say, when measuring the second sound intensity level, it is the same as the sound insulation enclosure The distance between is equal to the distance between the shunt reactor and the first sound intensity level. Of course, both the first sound intensity level and the second sound intensity level are measured under the same conditions.

The second sound intensity level may be an A-weighted sound intensity level or a sound intensity level. The frequency band range of the second sound intensity level can be selected arbitrarily. However, the frequency range of the second sound intensity level shall be the same as that of the first sound intensity level, and if the first sound intensity level is an A-weighted sound intensity level, the second sound intensity level shall also be an A-weighted sound intensity level. intensity level; if the first sound intensity level is the sound intensity level, then the second sound intensity level is also the sound intensity level. In this embodiment, what the sound intensity probe measures is the A-weighted second sound intensity level of the 1/3 octave band, and correspondingly, the sound power level of the sound insulation cover is the A-weighted sound power of the 1/3 octave band class.

The sound insulation amount determination step S3 is to determine the difference between the calculated sound power level of the shunt reactor and the sound power level of the sound insulation enclosure as the sound insulation amount of the shunt reactor sound insulation enclosure.

Specifically, the sound power level of the shunt reactor is marked as L _W1 , the sound power level of the sound insulation cover is marked as L _W2 , and the sound insulation of the sound insulation cover of the shunt reactor is marked as TL, then TL = ΔL _A = L _W1 -L _w2 .

When the sound power level of the shunt reactor is calculated based on the total first sound intensity level, then the sound power level of the shunt reactor is the total sound power level, and correspondingly, the sound power level of the sound insulation enclosure should also be calculated according to The total sound power level calculated from the total second sound intensity level, then the sound insulation of the shunt reactor sound insulation cover is obtained by subtracting the total sound power level of the sound insulation cover from the total sound power level of the shunt reactor total sound insulation.

When the sound power level of the shunt reactor is calculated based on 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, and correspondingly, the sound power of the sound insulation cover The sound power level of the frequency should also be calculated based on the second sound intensity level of the frequency, then the sound insulation of the shunt reactor sound insulation cover is the sound power level of the frequency of the shunt reactor minus the sound insulation cover The sound power level at that frequency gives the sound insulation at that frequency. In this way, the sound insulation of the shunt reactor sound insulation cover corresponding to any frequency within 50 Hz to 5000 Hz can be calculated. Generally speaking, the sound insulation of the shunt reactor sound insulation cover is the total sound insulation calculated according to the total sound intensity level.

It can be seen that in this embodiment, by measuring the sound intensity level and then calculating the sound power level according to the sound intensity level, the sound insulation of the shunt reactor sound insulation cover is finally calculated. Since the sound intensity is a vector and has directionality, it is not easy Affected by the external environment, the measured sound intensity level is more accurate, thereby improving the accuracy of the calculation of the sound insulation, and solving the problem of being easily interfered by external sound sources when the sound pressure level difference method is used to calculate the sound insulation of the sound insulation cover in the prior art The problem of inaccurate calculation; in addition, the first sound intensity level of the shunt reactor and the second sound intensity level of the sound insulation enclosure are measured under the same conditions, making the calculated sound insulation more accurate and reliable .

Referring to FIG. 2 , FIG. 2 is another flow chart of the method for testing the sound insulation of a shunt reactor sound insulation cover provided by an embodiment of the present invention. As shown in the figure, measure the first sound intensity level at the first preset distance from the shunt reactor, and calculate the sound power level of the shunt reactor according to the measured first sound intensity level, that is, the first sound power level calculation step S1 further includes:

In the first setting sub-step S11, at a first preset distance from the shunt reactor, at least one first ring-shaped test unit surrounding the shunt reactor is arranged along the height direction of the shunt reactor, and each first ring-shaped test unit is A plurality of first test points are arranged along the circumferential direction.

Specifically, refer to FIG. 7 . FIG. 7 is a schematic structural diagram of a first annular test unit in the method for testing the sound insulation of a shunt reactor sound insulation cover provided by an embodiment of the present invention. There may be multiple first annular test units 4 , and each first annular test unit 4 is arranged along the height direction of the shunt reactor 1 , and the first annular test unit 4 surrounds one circle of the shunt reactor. Each first annular test unit 4 includes a plurality of first test points 5 , and each first test point 5 circles around the shunt reactor to form the first annular test unit 4 . The first test points 5 are evenly 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 ring test unit 4 is the same as that of the shunt reactor 1, that is, the shape of the ring column where the first ring test unit 4 is located is the same as that of the shunt reactor 1, that is to say, each first ring test The first test points 5 in the unit 4 are collectively surrounded by an annular columnar body, and the shape of the annular columnar body is the same as that of the shunt reactor 1 . Wherein, the distance between the first loop test unit and the shunt reactor is a first preset distance. The number of first test points 5 in each first ring test unit 4 is the same.

In this embodiment, there are two first annular test units 4. If the height of the oil tank of the shunt reactor is recorded as h ₁ , the two first annular test units are respectively placed in with place.

During specific implementation, if other obstacles are encountered at the position where the first test point 5 is set, then the setting position of the first test point 5 is adaptively modified, such as setting the first test point 5 on the side of the obstacle .

The first determination sub-step S12 is to sequentially measure the first sound intensity level of each first test point in each first annular test unit.

Specifically, the first sound intensity level of each first test point 5 in each first ring test unit 4 is measured sequentially with a sound intensity probe, and the measurement time for each first test point 5 can be set , for example: 1min, but this embodiment does not impose any limitation on this. Before the measurement, you can choose the frequency range of the sound intensity probe to measure, and you can also choose whether to measure the A-weighted sound intensity level or the sound intensity level.

During specific implementation, before the measurement, the cooling fan 3 provided on one side of the shunt reactor 1 should be turned off to prevent the noise generated by the cooling fan from affecting the measured sound intensity level.

The first average sound intensity level sub-step S13, calculate the average sound intensity level of the shunt reactor according to the determined first sound intensity level of each first test point

Specifically, calculate the average sound intensity level of the shunt reactor according to the first sound intensity level meter at each first test point The method is arbitrary, and this embodiment does not make any restrictions on it. In this embodiment, one of the calculation methods is introduced as follows:

According to the formula Calculate the average sound intensity level of a shunt reactor In the above formula, N ₁ is the number of all first test points, and L ₁₁ ⁱ is the sound intensity level of the i-th first test point. Wherein, N1 is the sum of the quantity of all the _first test points in all the first ring test units, for example, two first ring test units, each of the first ring test units has 40 first test points , then the number of all first test points is: 40+40=80, that is, N ₁ =80.

The first sound power level sub-step S14, according to the calculated average sound intensity level of the shunt reactor Calculate the sound power level L _W1 of the shunt reactor.

Specifically, according to the average sound intensity level of the shunt reactor calculated in the above-mentioned first average sound intensity level sub-step S13 The method for calculating the sound power level L _W1 of the shunt reactor is arbitrary, and this embodiment does not impose any limitation on it.

It can be seen that in this embodiment, by measuring the first sound intensity level at each first test point in the first annular test unit, it can effectively ensure the accuracy of the calculation of the average sound intensity level, thereby ensuring the calculated sound intensity level. The power level is accurate and reliable, and the calculation method is simple and accurate; in addition, the setting of each first test point in the first ring test unit can effectively reduce the measurement error caused by the uneven distribution of the near-field sound field of the shunt reactor, and improve the measurement efficiency. precision.

Referring to FIG. 3 , FIG. 3 is another flow chart of the method for testing the sound insulation of a shunt reactor sound insulation cover provided by an embodiment of the present invention. For the average sound intensity level of the shunt reactor calculated according to The calculation method for calculating the sound power level L _W1 of the shunt reactor, this embodiment introduces one of the calculation methods, specifically, according to the calculated average sound intensity level of the shunt reactor Calculating the sound power level L _W1 of the shunt reactor, that is, the first sound power level substep S14 includes the following substeps:

The first acquisition sub-step S141 is to acquire the height h ₁ of the oil tank of the shunt reactor and the circumference l _m1 of the annular cylinder where the first annular test unit is located.

Specifically, refer to FIG. 6 , which is a schematic structural diagram of a shunt reactor provided by an embodiment of the present invention. Measure the fuel tank height h ₁ of the shunt reactor with a range finder or other measuring equipment. The perimeter l _m1 of the annular columnar body where the first annular test unit is located, that is, the perimeter of the annular columnar body formed by the first test points in any first annular test unit, the perimeter can be measured by measuring equipment Measurement. Wherein, each first annular test unit is located in the side of the same annular columnar body.

The first side area calculation sub-step S142 is to calculate the side area S ₁ of the annular cylinder where the first annular test unit is located according to the height h ₁ of the fuel tank and the circumference l _m1 .

Specifically, the annular columnar body where the first annular test unit is located is a rectangle after unfolding, and the area of the rectangle is the side area S ₁ of the annular columnar body where the first annular test unit is located. The calculation formula of the side area S1 is related to the _first preset distance, that is, when the _first preset distance is different, the calculation formula of the side area S1 is also different. For example, when the first preset distance is 2m, the side surface area S ₁ can be calculated according to the formula S ₁ =(h ₁ +2)l _m1 . When the _first preset distance is other values, the calculation formula of the side surface area S1 will also be changed accordingly.

The first calculation sub-step S143, according to the formula Calculate the sound power level L _W1 of the shunt reactor, in the above formula, is the average sound intensity level of the shunt reactor.

Specifically, the average sound intensity level of the shunt reactor Calculated by the first average sound intensity level sub-step S13.

It can be seen that in this embodiment, when calculating the sound power level of the shunt reactor, the side area of the annular cylinder where the first annular test unit is located is taken into account, and the overall volume change after the sound insulation cover is installed is fully considered , effectively reducing the calculation error, making the calculation of the sound insulation of the shunt reactor sound insulation cover accurate and reliable.

Referring to FIG. 4 , FIG. 4 is another flow chart of the method for testing the sound insulation of a shunt reactor sound insulation cover provided by an embodiment of the present invention. As shown in the figure, install the sound insulation cover on the shunt reactor, measure the second sound intensity level at the first preset distance from the sound insulation cover, and calculate the sound power level of the sound insulation cover according to the measured second sound intensity level , that is, the second sound power level determination step S2, further comprising:

In the second setting sub-step S21, at a first preset distance from the sound insulation enclosure, at least one second annular test unit surrounding the sound insulation enclosure is arranged along the height direction of the sound insulation enclosure, and each second annular test unit is A plurality of second test points are set along the circumferential direction.

Specifically, there may be multiple second ring-shaped test units, and each second ring-shaped test unit is arranged along the height direction of the sound insulation enclosure, and the second ring-shaped test unit surrounds one circle of the sound insulation enclosure. Each second ring-shaped test unit includes a plurality of second test points, and each second test point surrounds a circle along the circumference of the sound insulation enclosure to form a second ring-shaped test unit. The second test points are evenly distributed along the circumference of the sound insulation enclosure, 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 enclosure, that is, the shape of the annular cylinder where the second annular test unit is located is the same as that of the sound insulation enclosure, that is to say, each of the second annular test units The second test point is surrounded by an annular column, and the shape of the annular column is the same as that of the sound insulation cover. Wherein, the distance between the second annular test unit and the sound insulation enclosure is a first preset distance. The number of second test points in each second ring test unit is the same.

In this embodiment, there are two second ring-shaped test units. If the height of the oil tank of the sound insulation cover is recorded as h ₂ , the two first ring-shaped test units are respectively placed in with place.

During specific implementation, if other obstacles are encountered at the position where the second test point is set, then the setting position of the second test point is adaptively modified, such as setting the second test point at the side of the obstacle.

The second measurement sub-step S22 is to sequentially determine the second sound intensity level of each second test point in each second annular test unit.

Specifically, use the sound intensity probe to measure the second sound intensity level of each second test point in each second ring test unit in sequence, and the measurement time for each second test point can be set, for example: 1 min, which is not limited in this embodiment. Before the measurement, you can choose the frequency range of the sound intensity probe to measure, and you can also choose whether to measure the A-weighted sound intensity level or the sound intensity level.

During specific implementation, before the measurement, the cooling fan 3 provided on one side of the shunt reactor 1 should be turned off to prevent the noise generated by the cooling fan from affecting the measured sound intensity level.

Second average sound intensity level sub-step S23, calculate the average sound intensity level of the sound insulation enclosure according to the second sound intensity level of each second test point measured

Specifically, the average sound intensity level of the sound insulation enclosure is calculated according to the second sound intensity level meter at each second test point The method of is arbitrary, and this embodiment does not make any restrictions on it. In this embodiment, one of the calculation methods is introduced as follows:

According to the formula Calculate the average sound intensity level of a shunt reactor In the above formula, N ₂ is the number of all first test points, and L ₁₂ ⁱ is the sound intensity level of the i-th first test point. Wherein, N ₂ is the sum of the numbers of all the second test points in all the second ring test units, and the number of the first test points N ₁ is smaller than the number of the second test points N ₂ . For example, there are two second ring test units, each of which has 50 second test points, then the number of all second test points is: 50+50=100, ie N ₂ =100.

The second sound power level sub-step S24, according to the average sound intensity level of the calculated sound insulation enclosure Calculate the sound power level L _W2 of the sound enclosure.

Specifically, according to the average sound intensity level of the sound insulation enclosure calculated in the above-mentioned second average sound intensity level sub-step S23 The method for calculating the sound power level L _W1 of the sound insulation enclosure is arbitrary, which is not limited in this embodiment.

It can be seen that in this embodiment, by measuring the second sound intensity level at each second test point in the second annular test unit, it can effectively ensure the accuracy of the calculation of the average sound intensity level, thereby ensuring the calculated sound intensity level. The power level is accurate and reliable, and the calculation method is simple and accurate; in addition, the setting of each second test point in the second ring test unit can effectively reduce the measurement error caused by the uneven distribution of the near-field sound field of the shunt reactor, and improve the measurement accuracy. precision.

Referring to FIG. 5 , FIG. 5 is another flow chart of the method for testing the sound insulation of a shunt reactor sound insulation cover provided by an embodiment of the present invention. For the average sound intensity level of the sound enclosure calculated according to The calculation method for calculating the sound power level L _W1 of the sound insulation enclosure, one of which is introduced in this embodiment, specifically, according to the calculated average sound intensity level of the sound insulation enclosure Calculating the sound power level L _W2 of the sound insulation enclosure, i.e. the second sound power level substep S24, includes the following substeps:

The second acquisition sub-step S241 is to acquire the height h ₂ of the sound insulation enclosure and the circumference l _m2 of the annular cylinder where the second annular test unit is located.

Specifically, the height h ₂ of the sound insulation enclosure is measured using a distance meter or other measuring equipment. The perimeter l _m2 of the annular columnar body where the second annular test unit is located, that is, the perimeter of the annular columnar body formed by each second test point in any second annular test unit, this perimeter can be measured by measuring equipment Measurement. Wherein, each of the second annular test units is located in the side of the same annular columnar body.

The second side area calculation sub-step S242 is to calculate the side area S ₂ of the annular cylinder where the second annular test unit is located according to the height h ₂ and the perimeter l _m2 of the sound insulation enclosure.

Specifically, the annular columnar body where the second annular test unit is located is a rectangle after unfolding, and the area of the rectangle is the side area S ₂ of the annular columnar body where the second annular test unit is located. The calculation _formula of the side area S2 is related to the first preset distance, that is to say, when the first preset distance is different, the calculation _formula of the side area S2 is also different. For example, when the first preset distance is 2m, the side surface area S ₂ is calculated according to the formula S ₂ =(h ₂ +2)l _m2 . When the first preset distance is other values, the calculation _formula of the side surface area S2 will also be changed accordingly.

The second calculation sub-step S243, according to the formula Calculate the sound power level L _W2 of the sound insulation enclosure, in the above formula, is the average sound intensity level of the sound enclosure.

Specifically, the average sound intensity level of the acoustic enclosure It is calculated by the second average sound intensity level sub-step S23.

It can be seen that in this embodiment, when calculating the sound power level of the sound insulation enclosure, the side area of the annular columnar body where the second annular test unit is located is taken into account, and the overall volume change after the installation of the sound insulation enclosure is fully considered , effectively reducing the calculation error, making the calculation of the sound insulation of the shunt reactor sound insulation cover accurate and reliable.

The following is a detailed introduction to the calculation method of the sound insulation of the shunt reactor sound insulation cover. Wherein, the first preset distance is 2m. The measurement frequency of the sound intensity probe includes 50Hz to 5000Hz, and the measurement is the A-weighted sound intensity level of the 1/3 octave band, and correspondingly, the sound power level is the A-weighted sound power level of the 1/3 octave band.

First, when the shunt reactor is not installed with a sound insulation cover, calculate the A-weighted sound power level of the 1/3 octave band of the shunt reactor.

(1) Measure the fuel tank height h ₁ of the shunt reactor with a rangefinder.

(2) At a distance of 2m from the shunt reactor, set up two first loop test units, and the two first loop test units are respectively placed in with , the distance between the first test points of each ring test unit is 1m.

(3) Ensure that the shunt reactor operates normally under the rated voltage, and turn off the cooling fan 3 . Use the sound intensity probe to sequentially measure the A-weighted first sound intensity level of the 1/3 octave band for each first test point in each ring test unit, and the measurement time for each first test point is 1 min. Among them, the measurement frequency of the sound intensity probe includes 50 Hz to 5000 Hz, that is to say, the sound intensity probe measures any 1/3 octave band A-weighted first sound intensity level and the total A-weighted first sound level within 50 Hz to 5000 Hz. Strong grade.

(4) According to the formula Calculation of 1/3 octave band A-weighted average sound intensity level for shunt reactors Wherein, N ₁ is the number of all first test points in the two ring test units, and L _1A1 ⁱ is the 1/3 octave band A-weighted first sound intensity level of the ith first test point.

(5) Measure the perimeter l _m1 of the annular cylinder where any first annular test unit is located, and calculate the side area S of the annular column where the first annular test unit is located according to S ₁ =(h ₁ +2)l _{m1 1} .

(6) According to the formula Calculate the 1/3 octave band A-weighted sound power level L _WA1 of the shunt reactor.

Then, when the shunt reactor is installed with the sound insulation cover, calculate the A-weighted sound power level of the 1/3 octave band of the sound insulation cover.

(7) Use a range finder to measure the height h ₂ of the sound insulation enclosure.

(8) At a distance of 2m from the sound insulation enclosure, two second ring-shaped test units are set, and the two second ring-shaped test units are respectively placed in with , the distance between the second test points of each annular test unit is 1m.

(9) Ensure that the shunt reactor operates normally under the rated voltage, and turn off the cooling fan 3 . Use the sound intensity probe to sequentially measure the A-weighted second sound intensity level of the 1/3 octave band for each second test point of each ring test unit, and the measurement time for each second test point is 1 min. Among them, the measurement frequency of the sound intensity probe includes 50 Hz to 5000 Hz, that is to say, the sound intensity probe measures any 1/3 octave band A-weighted second sound intensity level and the total A-weighted second sound intensity level within 50 Hz to 5000 Hz. Strong grade.

(10) According to the formula Calculation of 1/3 octave band A-weighted average sound intensity levels for acoustic enclosures Wherein, N ₂ is the number of all the second test points in the two ring test units, and L _1A2 ⁱ is the 1/3 octave band A-weighted second sound intensity level of the i-th second test point.

(11) Measure the perimeter l _m2 of the annular columnar body where any second annular test unit is located, and calculate the side area S of the annular columnar body where the second annular test unit is located according to S ₂ =(h ₂ +2)l _{m2 2} .

(12) According to the formula Calculate the 1/3 octave band A-weighted sound power level L _WA2 of the acoustic enclosure.

Finally, the 1/3 octave band A-weighted sound power level L _WA1 of the shunt reactor is subtracted from the 1/3 octave band A-weighted sound power level L _WA2 of the sound insulation cover to obtain the sound insulation of the sound insulation cover of the shunt reactor , recorded as TL, that is, TL=ΔL _WA =L _WA1 -L _WA2 .

Since the sound intensity probe can measure any 1/3 octave band A-weighted sound intensity level and the total A-weighted sound intensity level within 50Hz to 5000Hz, any 1/3 octave band A-weighted sound intensity level can be measured according to actual needs. The weighted sound intensity level or the total A-weighted sound intensity level can be calculated according to the above method to obtain the sound insulation of the sound insulation cover of any 1/3 octave band shunt reactor or the sound insulation of the total shunt reactor sound insulation cover Sound insulation.

Since the sound energy of the high-voltage shunt reactor is mainly concentrated in the 1/3 octave band of the center frequency of 100Hz, it is necessary to calculate the sound insulation of the shunt reactor sound insulation cover corresponding to the 1/3 octave band of the center frequency of 100Hz. It can be obtained by calculating the 1/3 octave band A-weighted sound intensity level of 100Hz measured by the sound intensity probe according to the above method.

To sum up, in this embodiment, since the sound intensity is a vector and has directionality, it is not easily disturbed by the external environment, and the measured sound intensity level is more accurate, thereby improving the accuracy of sound insulation calculation; in addition, the parallel Both the first sound intensity level of the reactor and the second sound intensity level of the sound insulation enclosure are measured under the same conditions, making the calculated sound insulation more accurate and reliable.

Device example:

Referring to Fig. 8, Fig. 8 is a structural block diagram of a sound insulation test device for a shunt reactor sound insulation cover provided by an embodiment of the present invention. The present invention also proposes a sound insulation testing device for a shunt reactor sound insulation cover, which includes: a first sound power level calculation module 100 , a second sound power level calculation module 200 and a sound insulation determination module 300 . in,

The first sound power level calculation module 100 is used to measure a first sound intensity level at a first preset distance from the shunt reactor, and calculate the sound power level of the shunt reactor according to the measured first sound intensity level.

The second sound power level calculation module 200 is used to install a sound insulation cover on the shunt reactor, measure the second sound intensity level at the first preset distance from the sound insulation cover, and calculate the sound insulation according to the measured second sound intensity level The sound power level of the enclosure.

The sound insulation determining module 300 is used to determine the difference between the calculated sound power level of the shunt reactor and the sound power level of the sound insulation enclosure as the sound insulation of the shunt reactor sound insulation enclosure.

Wherein, for the specific implementation process of the device, refer to the description in the foregoing method embodiments, and details will not be repeated in this embodiment.

Since the method for testing the sound insulation of the shunt reactor sound insulation cover has the above effects, the sound insulation test device for the shunt reactor sound insulation cover also has corresponding technical effects.

Referring to Fig. 9, Fig. 9 is another structural block diagram of a sound insulation test device for a shunt reactor sound insulation cover provided by an embodiment of the present invention. As shown in the figure, the first sound power level calculation module 100 may include: a first setting unit 110 , a first determination unit 120 , a first average sound intensity level unit 130 and a first sound power level unit 140 . in,

The first setting unit 110 is used to set at least one first ring 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 ring test unit is A plurality of first test points are set along the circumferential direction.

The first determination unit 120 is used for sequentially measuring the first sound intensity level of each first test point in each first annular test unit.

The first average sound intensity level unit 130 is used to calculate the 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 to calculate the average sound intensity level of the shunt reactor Calculate the sound power level L _W1 of the shunt reactor.

Wherein, for the specific implementation process of the first setting unit 110, the first determination unit 120, the first average sound intensity level unit 130 and the first sound power level unit 140 in the device, please refer to the first setter in the above method embodiment. The descriptions of step S11, the first determining sub-step S12, the first average sound intensity level sub-step S13 and the first sound power level sub-step S14 are sufficient, and will not be repeated here in this embodiment.

It can be seen that this embodiment can effectively ensure that the calculation of the average sound intensity level is accurate, thereby ensuring that the calculated sound power level is accurate and reliable, and the calculation method is simple and accurate; in addition, each first test point in the first ring test unit The setting can effectively reduce the measurement error caused by the uneven distribution of the near-field sound field of the shunt reactor, and improve the measurement accuracy.

Referring to Fig. 10, Fig. 10 is another structural block diagram of a sound insulation test device for a shunt reactor sound insulation cover provided by an embodiment of the present invention. The second sound power level calculation module 200 may include: a second setting unit 210 , a second determination unit 220 , a second average sound intensity level unit 230 and a second sound power level unit 240 . in,

The second setting unit 210 is used to set at least one second annular test unit surrounding the sound insulation enclosure along the height direction of the sound insulation enclosure at a first preset distance from the sound insulation enclosure, and each second annular test unit is A plurality of second test points are set along the circumferential direction.

The second determination unit 220 is configured to sequentially determine the second sound intensity level of each second test point in each second annular test unit.

The second average sound intensity level unit 230 is used to calculate the average sound intensity level of the sound insulation enclosure according to the measured second sound intensity level of each second test point

The second sound power level unit 240 is used to calculate the average sound intensity level of the sound insulation enclosure Calculate the sound power level L _W2 of the sound enclosure.

Wherein, for the specific implementation process of the second setting unit 210, the second determination unit 220, the second average sound intensity level unit 230 and the second sound power level unit 240 in the device, please refer to the second setter in the above method embodiment. The description of step S21, the second measurement sub-step S22, the second average sound intensity level sub-step S23 and the second sound power level sub-step S24 is enough, and the present embodiment will not repeat them here.

It can be seen that this embodiment can effectively ensure that the calculation of the average sound intensity level is accurate, thereby ensuring that the calculated sound power level is accurate and reliable, and the calculation method is simple and accurate; in addition, each second test point in the second ring test unit The setting can effectively reduce the measurement error caused by the uneven distribution of the near-field sound field of the shunt reactor, and improve the measurement accuracy.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. 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, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these 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 reactor_W1。

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 reactor_W1The 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 positioned_m1；

According to the height h of the oil tank₁And a circumference l_m1Calculating 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 reactor_W1In 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 cover_W2。

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 cover_W2The 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 positioned_m2；

According to the height h of the sound-proof cover₂And a circumference l_m2Calculating 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 cover_W2In 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 reactor_W1。

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 cover_W2。