CN115183865A - Method for measuring sound power level of corona discharge noise of outgoing line of transformer substation - Google Patents
Method for measuring sound power level of corona discharge noise of outgoing line of transformer substation Download PDFInfo
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- 238000000825 ultraviolet detection Methods 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a method for measuring the sound power level of corona discharge noise of an outgoing line of a transformer substation, which comprises the following steps: s1, acquiring the position and the number of corona discharge points; s2, measuring points with the number more than that of the corona discharge points are arranged in the area near the lower portion of the corona discharge points, the sound intensity level perpendicular to the ground direction is measured at the position of each measuring point, and the distance and the inclination angle between each measuring point and each corona discharge point are measured; and S3, establishing a formula simultaneous equation set according to the measured sound intensity level, distance and inclination angle, solving the equation set by using a least square method, and calculating the noise sound power level of each corona discharge point. According to the characteristic that the corona discharge point is generally located at high altitude and other sound source equipment in the station is generally lower, the method measures the sound intensity component of the area below the corona discharge point in the direction vertical to the ground by means of the vector characteristic of sound intensity, so that the effects of increasing the contribution weight of corona discharge noise to the measurement result and improving the accuracy of measuring the sound power level of the corona discharge noise are achieved.
Description
Technical Field
The invention relates to the technical field of noise measurement, in particular to a method for measuring the sound power level of corona discharge noise of an outgoing line of a transformer substation.
Background
There are many sound source devices in a transformer substation/converter station, and the measurement of the sound power level of the outgoing line corona discharge noise is always a big difficulty. Because the position of a corona discharge point is generally positioned at a high altitude, near-field measurement is difficult to carry out due to the limitation of the electrical safety distance in the station; when the device is used for long-distance measurement, the total sound power level of corona discharge noise is small, and the device is easily influenced by noise of other devices in a station to cause large measurement error.
Although the microphone array technology adopting the beam forming algorithm can measure the sound power level of corona discharge noise, the microphone array is complex to operate, heavy in instrument and high in price, and is difficult to apply to noise field tests of all substations and converter stations.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for measuring the sound power level of the corona discharge noise of the outgoing line of a transformer substation. According to the characteristic that the corona discharge point is generally located at high altitude and other sound source equipment in the station is generally lower, the method measures the sound intensity component of the area below the corona discharge point in the direction vertical to the ground by means of the vector characteristic of sound intensity, so that the effects of increasing the contribution weight of corona discharge noise to the measurement result and improving the accuracy of measuring the sound power level of the corona discharge noise are achieved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for measuring the sound power level of corona discharge noise of an outgoing line of a transformer substation comprises the following steps:
s1, acquiring the position and the number of corona discharge points;
s2, measuring points with the number more than that of the corona discharge points are arranged in the area near the lower portion of the corona discharge points, the sound intensity level perpendicular to the ground direction is measured at the position of each measuring point, and the distance and the inclination angle between each measuring point and each corona discharge point are measured;
and S3, establishing a formula simultaneous equation set according to the measured sound intensity level, distance and inclination angle, solving the equation set by using a least square method, and calculating the noise sound power level of each corona discharge point.
Preferably, the simultaneous equations are:
in the formula, N is the number of determined corona discharge points, M is the number of measuring points arranged in the area near the lower part of the corona discharge points, and M is more than N; w is a group of i Noise sound power for the ith corona discharge point; x is the sound intensity contribution vertical to the ground direction caused by other noise sources except corona discharge noise;
is an error vector; i is Vj Is the jth measuring point vertical to the groundA sound intensity component in a face direction; a is a ij Is the coefficient of the equation set; i =1, …, N; j =1, …, M;
after solving the equation set to obtain the noise sound power of each corona discharge point, the noise sound power level of each corona discharge point is obtained according to the following formula:
in the formula, L Wi Noise power level for the ith corona discharge point; w 0 ＝10 -12 W is the reference acoustic power.
Further preferably, the sound intensity component I perpendicular to the ground direction at each measuring point is obtained according to the sound intensity level perpendicular to the ground direction at each measuring point measured in S2 Vj ：
In the formula I 0 ＝10 -12 W/m 2 Is the reference sound intensity; l is IVj The sound intensity level of the jth measuring point in the direction vertical to the ground is shown; j =1, …, M.
Further preferably, the coefficient a of the equation set is obtained according to the distance and the inclination angle between each measuring point and each corona discharge point measured in S2 ij ：
In the formula, r ij Is the distance between the ith corona discharge point and the jth measuring point, theta ij The inclination angle between the ith corona discharge point and the jth measuring point is shown; i =1, …, N; j =1, …, M.
Further preferably, the least square method is used for solving the equation set to obtain the noise sound power W of each corona discharge point i 。
Preferably, the method for acquiring the position and the number of the corona discharge points comprises ultraviolet detection.
Preferably, the sound intensity level perpendicular to the ground at the position of each measuring point is measured by a sound intensity meter.
Preferably, the distance and inclination angle between each measuring point and each corona discharge point are measured by a laser distance meter.
Compared with the prior art, the invention has the following advantages and beneficial effects:
compared with the method for calculating the sound power level of the corona discharge noise through the sound pressure level test result near the corona discharge point, the method provided by the invention measures the sound intensity component of the area below the corona discharge point in the direction vertical to the ground by means of the vector characteristic of sound intensity according to the characteristic that the corona discharge point is generally positioned at high altitude and other sound source equipment in the station is generally positioned at lower positions, thereby achieving the effects of increasing the contribution weight of the corona discharge noise to the measurement result and improving the measurement accuracy of the sound power level of the corona discharge noise.
Compared with the method for measuring the sound power level of the corona discharge noise through the microphone array, the method simplifies the measuring method and the testing instrument, is more convenient and faster to operate, and is more suitable for the noise field test of the transformer substation and the converter station.
Drawings
FIG. 1 is a diagram showing the positional relationship between a corona discharge point and a measuring point in the present invention.
FIG. 2 is a schematic diagram of the distance and inclination angle between the measuring point and the corona discharge point in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other examples obtained based on the examples in the present invention are within the scope of the present invention. But are not to be construed as limiting the invention.
The invention provides a method for measuring the sound power level of corona discharge noise of an outgoing line of a transformer substation, which comprises the steps of firstly determining the number and the position of corona discharge points by using auxiliary means such as ultraviolet detection and the like, and arranging measuring points (shown in figure 1) with the number more than that of the corona discharge points in a nearby area below the corona discharge points. At each station position, the intensity level in the direction perpendicular to the ground is measured using an intensity meter, and the distance and inclination of the station to each corona discharge point position are measured using a laser rangefinder (see figure 2). Therefore, an equation set related to the sound power of each corona discharge point can be obtained, the sound power radiated by each corona discharge point under the condition of the minimum error can be obtained by solving the equation set by using a least square method, and the sound power level of the noise of each corona discharge point is further calculated.
The specific calculation principle of the sound power level is as follows:
regarding each corona discharge point as a unipole point sound source without directivity in a free field, the following are provided:
in the formula, N is the number of determined corona discharge points, M is the number of measuring points arranged in the area near the lower part of the corona discharge points, and M is more than N; w i Noise sound power of the ith corona discharge point; r is ij The distance between the ith corona discharge point and the jth measuring point is calculated; I.C. A ij The sound intensity contribution value of the ith corona discharge point to the jth measuring point is obtained; i =1, …, N; j =1, …, M.
Obtaining the component of the sound intensity contribution value of the ith corona discharge point to the jth measuring point in the direction vertical to the ground as follows:
in the formula I Vij The component of the sound intensity contribution value of the ith corona discharge point to the jth measuring point in the direction vertical to the ground; theta ij Is the inclination angle between the ith corona discharge point and the jth measuring point.
Defining the intermediate variables:
then there are:
I Vij ＝a ij ·W i
for other sound source devices except corona discharge noise, the sound source position is lower and far away from the measuring point, the sound intensity direction caused at the measuring point position is close to the horizontal direction, and the contribution value of the sound intensity to the direction vertical to the ground is smaller. The components of the sound intensity contribution values of the other sound source devices to the M measuring points in the direction vertical to the ground are all equal (which is approximately true when the positions of corona discharge points are relatively concentrated and the distances from the sound sources of the other devices are far), and are recorded as X.
Then the sound intensity component perpendicular to the ground direction at the jth measuring point is:
wherein X is the component of the contribution value of other sound sources to the sound intensity at each measuring point in the direction vertical to the ground, n j Is the measurement error at the jth measurement point; i is Vj The sound intensity component perpendicular to the ground direction at the jth measuring point can be calculated according to the test result in S2 by the following formula:
wherein L is IVj The sound intensity level of the jth measuring point in the direction vertical to the ground is shown; i is 0 ＝10 -12 W/m 2 The reference sound intensity.
The above equation holds for all M measurement points, and the simultaneous equations are:
wherein,
is an error vector;
in particular, when the other sound source devices contribute negligible components of the sound intensity contribution value at the measurement point in the direction perpendicular to the ground (i.e., X = 0), the system of equations can be simplified as follows:
solving an equation set by using a least square method to obtain the noise sound power W of each corona discharge point i (i＝1,…,N)
The noise power level L of each corona discharge point is obtained according to the following formula Wi ：
In the formula, L Wi Noise sound power level for the ith corona discharge point; w 0 ＝10 -12 W is the reference acoustic power.
Optionally, a 50mm spacer more suitable for low frequency band may be used when the dual microphone probe is used to measure the sound intensity.
Optionally, when a hardened ground surface is present near the survey point, the ground surface near the survey point may be laid using sound absorbing material to reduce the effect of ground reflections on the sound intensity measurements.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (8)
1. A method for measuring the sound power level of corona discharge noise of an outgoing line of a transformer substation is characterized by comprising the following steps:
s1, acquiring the position and the number of corona discharge points;
s2, measuring points with the number more than that of the corona discharge points are arranged in the area near the lower part of the corona discharge points, the sound intensity level vertical to the ground direction is measured at the position of each measuring point, and the distance and the inclination angle between each measuring point and each corona discharge point are measured;
and S3, establishing a formula simultaneous equation set according to the measured sound intensity level, distance and inclination angle, solving the equation set by using a least square method, and calculating the noise sound power level of each corona discharge point.
2. The method for measuring the sound power level of the corona discharge noise of the outgoing line of the transformer substation according to claim 1, wherein the simultaneous equations are as follows:
in the formula, N is the number of determined corona discharge points, M is the number of measuring points arranged in the area near the lower part of the corona discharge points, and M is more than N; w i Noise sound power of the ith corona discharge point; x is the component of the sound intensity contribution in the direction vertical to the ground, which is caused by other noise sources except corona discharge noise;
is an error vector; i is Vj The sound intensity component of the jth measuring point in the direction vertical to the ground is taken as the sound intensity component; a is ij Is the coefficient of the equation set; i =1, …, N; j =1, …, M;
after solving the equation set to obtain the noise sound power of each corona discharge point, the noise sound power level of each corona discharge point is obtained according to the following formula:
in the formula, L Wi Noise power level for the ith corona discharge point; w 0 ＝10 -12 W is the reference acoustic power.
3. The method for measuring the sound power level of the corona discharge noise of the outgoing line of the transformer substation according to claim 2, wherein the sound intensity component perpendicular to the ground direction at each measuring point is obtained according to the sound intensity level perpendicular to the ground direction at each measuring point measured in S2:
in the formula I 0 ＝10 -12 W/m 2 Is the reference sound intensity; l is IVj The sound intensity level of the jth measuring point in the direction vertical to the ground is shown; j =1, …, M.
4. The method for measuring the sound power level of the corona discharge noise of the outgoing line of the transformer substation according to claim 2, wherein the coefficient a of the equation set is obtained according to the distance and the inclination angle between each measuring point and each corona discharge point measured in S2 ij ：
In the formula, r ij Is the distance between the ith corona discharge point and the jth measuring point, theta ij The inclination angle between the ith corona discharge point and the jth measuring point is shown; i =1, …, N; j =1, …, M.
5. The method for measuring the sound power level of the corona discharge noise of the outgoing line of the transformer substation according to claim 2, wherein the least square method is used for solving the equation set to obtain the sound power W of the noise of each corona discharge point i 。
6. The substation outlet corona discharge noise sound power level measuring method according to claim 1, wherein the method for acquiring the position and number of corona discharge points comprises ultraviolet detection.
7. The method for measuring the sound power level of the corona discharge noise of the outgoing line of the transformer substation according to claim 1, wherein a sound intensity meter is adopted to measure the sound intensity level of each measuring point in the direction perpendicular to the ground.
8. The method for measuring the sound power level of the corona discharge noise of the outgoing line of the transformer substation according to claim 1, wherein a laser distance meter is used for measuring the distance and the inclination angle between each measuring point and each corona discharge point.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106096184A (en) * | 2016-06-24 | 2016-11-09 | 中国电力科学研究院 | A kind of noise calculation method and system of transformator multiple spot Source Model based on sound intensity technique |
| KR20200030807A (en) * | 2018-09-13 | 2020-03-23 | 한국전력공사 | Apparatus and method for evaluating sound power for multiple noise source |
| CN111753405A (en) * | 2020-06-05 | 2020-10-09 | 国网湖北省电力有限公司电力科学研究院 | Transformer substation sound source equipment source intensity solving method and system |
| CN112834022A (en) * | 2021-01-05 | 2021-05-25 | 华北电力大学（保定） | Method for calculating audible noise of cross crossing area of alternating-current transmission line |
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- 2022-06-23 CN CN202210726185.9A patent/CN115183865B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106096184A (en) * | 2016-06-24 | 2016-11-09 | 中国电力科学研究院 | A kind of noise calculation method and system of transformator multiple spot Source Model based on sound intensity technique |
| KR20200030807A (en) * | 2018-09-13 | 2020-03-23 | 한국전력공사 | Apparatus and method for evaluating sound power for multiple noise source |
| CN111753405A (en) * | 2020-06-05 | 2020-10-09 | 国网湖北省电力有限公司电力科学研究院 | Transformer substation sound source equipment source intensity solving method and system |
| CN112834022A (en) * | 2021-01-05 | 2021-05-25 | 华北电力大学（保定） | Method for calculating audible noise of cross crossing area of alternating-current transmission line |
Non-Patent Citations (1)
| Title |
|---|
| 黄雪涛 等: "《汽车振动基础》", 30 June 2021, 北京理工大学出版社, pages: 136 * |
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