CN113532635B - Noise silence evaluation method and device for power transmission and transformation project - Google Patents
Noise silence evaluation method and device for power transmission and transformation project Download PDFInfo
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Abstract
The application discloses a power transmission and transformation project noise silence evaluation method and device, wherein the method comprises the following steps: measuring noise emission of a sound source of power equipment operated by a power transmission and transformation project by adopting a coherent power method, and obtaining a noise emission frequency spectrum; and selecting a first single-frequency noise value from the noise emission frequency spectrum, comparing the first single-frequency noise value with the environment comprehensive noise value under the corresponding frequency, and if the noise meets the preset requirement, judging that the noise of the sound source of the power transmission and transformation engineering operation power equipment meets the mute requirement. Through the mode, whether the noise emission of the power transmission and transformation project meets the mute requirement can be effectively evaluated.
Description
Technical Field
The application relates to the technical field of noise silence evaluation, in particular to a noise silence evaluation method and device for power transmission and transformation engineering.
Background
Certain hospitals, sanatorium, houses, education, scientific research and other places have high requirements on the quality of the acoustic environment, so that the noise emission of the surrounding power transmission and transformation projects needs to be managed and controlled. How to realize mute emission for power transmission and transformation engineering of a noise emission main body (mute definition: human ears cannot hear the existence of power transmission and transformation engineering noise) is a difficulty, wherein a key point is how to evaluate whether the noise emission of the power transmission and transformation engineering meets mute requirements.
However, no noise silence evaluation method for power transmission and transformation engineering is available for reference.
Disclosure of Invention
The application provides a power transmission and transformation project noise mute evaluation method and device, which are used for solving the problem that no power transmission and transformation project noise mute evaluation method can be used for reference in the prior art.
In order to solve the technical problems, the application provides a noise mute evaluation method for power transmission and transformation engineering, which comprises the following steps: measuring noise emission of a sound source of power equipment operated by a power transmission and transformation project by adopting a coherent power method, and obtaining a noise emission frequency spectrum; and selecting a first single-frequency noise value from the noise emission frequency spectrum, comparing the first single-frequency noise value with the environment comprehensive noise value under the corresponding frequency, and if the noise meets the preset requirement, judging that the noise of the sound source of the power transmission and transformation engineering operation power equipment meets the mute requirement.
Optionally, the method for measuring noise emission of a sound source of an electric power equipment operated by a power transmission and transformation project by adopting a coherent power method comprises the following steps: each shell of the sound source of the running power equipment is provided with an acceleration sensor, a microphone is arranged at a sound receiving point, and the data acquisition front end is connected with the acceleration sensor and the microphone; and obtaining the noise emission spectrum of the sound source of the running power equipment at the sound receiving point through coherent power analysis.
Optionally, before obtaining the noise emission spectrum of the operating power device sound source at the sound receiving point by coherent power analysis, the method comprises: obtaining the distance between the acceleration sensor and the sound receiving point; and if the distance exceeds the preset distance, synchronously measuring vibration signals of the sound source of the running power equipment and noise signals of the sound receiving points by adopting the positioning device at the front ends of a plurality of data acquisition.
Optionally, the method for measuring noise emission of a sound source of an electric power equipment operated by a power transmission and transformation project by adopting a coherent power method comprises the following steps: suspending the acceleration sensor in a near field region of a sound source of the running power equipment; alternatively, a microphone is used in the near field region of the sound source of the operating power device.
Optionally, the method further comprises: measuring the noise A sound level of the sound receiving point of the fan in the opening state and the closing state respectively; if the first difference between the noise A sound level of the fan in the opening state and the noise A sound level of the fan in the closing state is smaller than a preset value, judging that the noise of the fan in the power transmission and transformation project meets the mute requirement.
Optionally, the method further comprises: when the sound source of the running power equipment and the noise of the fan meet the mute requirement, the power transmission and transformation project is judged to meet the mute requirement.
Optionally, selecting a first single frequency noise value from the noise emission spectrum comprises: at the first 20 th order of frequency multiplication of 50Hz in the noise emission spectrum, a single-frequency noise value having an absolute value of a difference from the environmental integrated noise value of less than or equal to 2dB is extracted as a first single-frequency noise value.
Optionally, if the preset requirement is met, determining that the noise of the sound source of the power equipment operated by the power transmission and transformation project meets the mute requirement includes: if the second difference value of the environment comprehensive noise value minus the first single-frequency noise value is larger than ndB, and the value range of n is [0.5,2], the noise of the sound source of the power transmission and transformation engineering operation power equipment is judged to meet the mute requirement.
For solving above-mentioned technical problem, this application provides a power transmission and transformation engineering noise silence evaluation device, include: the electromagnetic noise measurement module is used for measuring noise emission of a sound source of power equipment operated by a power transmission and transformation project by adopting a coherent power method to obtain a noise emission frequency spectrum; and the electromagnetic noise mute evaluation module is used for selecting a first single-frequency noise value from the noise emission frequency spectrum, comparing the first single-frequency noise value with the environment comprehensive noise value under the corresponding frequency, and judging that the noise of the power transmission and transformation project operation power equipment sound source meets the mute requirement if the noise meets the preset requirement.
Optionally, the method further comprises: the fan noise measuring module is used for measuring the noise A sound level of the sound receiving point of the fan in the opening state and the closing state respectively; the fan noise mute evaluation module is used for judging whether the fan noise meets the mute requirement; if the first difference value between the noise A sound level of the fan in the opening state and the noise A sound level of the fan in the closing state is smaller than a preset value, judging that the noise of the fan in the power transmission and transformation project meets the mute requirement.
The application provides a noise mute evaluation method and device for power transmission and transformation engineering, which measure noise emission of a sound source of power equipment operated by the power transmission and transformation engineering by adopting a coherent power method. The method is based on the principle of evaluating causality between a plurality of sound sources and sound receiving points, namely, how many signals in the sound receiving points are caused by the sound sources, so as to extract a power spectrum derived from the sound source signals in the power spectrum of the sound receiving point signals. Through the mode, whether the noise emission of the power transmission and transformation project meets the mute requirement can be effectively evaluated.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of an embodiment of a method for evaluating noise silence in a power transmission and transformation project according to the present application;
fig. 2 is a flow chart of another embodiment of a noise muting evaluation method for power transmission and transformation engineering according to the present application;
fig. 3 is a schematic flow chart of an embodiment of a noise mute evaluation device for power transmission and transformation engineering in the present application;
FIG. 4 is a schematic diagram of the results of a certain #1 distribution room night boundary noise emission multiple coherent power measurements;
fig. 5 is a graph showing the results of a certain #2 distribution room night boundary noise emission multiple coherent power measurement.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the present application, the method and the device for evaluating noise silence of power transmission and transformation engineering provided by the present application are described in further detail below with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a power transmission and transformation project noise silence evaluation method, in which the evaluation method may include steps S110 to S120, and the steps are specifically as follows:
s110: and measuring the noise emission of the sound source of the power equipment operated by the power transmission and transformation project by adopting a coherent power method, and obtaining a noise emission frequency spectrum.
The principle of the coherent power method is to evaluate the causality between a plurality of sound sources and sound receiving points, namely, how many signals in the sound receiving points are caused by the sound sources, so as to extract the power spectrum derived from the sound source signals in the power spectrum of the signals of the sound receiving points. The sound source of the running power equipment can be equipment such as a transformer, a reactor and the like.
Specifically, an acceleration sensor is attached to each shell of a sound source of each running power device, a microphone is arranged at a sound receiving point, and the acceleration sensor and the microphone are connected to the front end of data acquisition. If the distance between the sound source and the sound receiving point of the running power equipment is too far, a GPS or Beidou positioning device and the like can be adopted to realize synchronous measurement of vibration signals of the sound source and noise signals of the sound receiving point by a plurality of data acquisition front ends.
In addition, if the safe distance cannot be directly contacted with the sound source of the running power equipment, the acceleration sensor can be hung in the near-field region of the sound source of the running power equipment, or a microphone is arranged in the near-field region of the sound source of the running power equipment.
The noise emission spectrum of the sound source of the running power equipment at the sound receiving point is obtained through the coherent power analysis. The data processing uses Fast Fourier Transform (FFT) spectral analysis.
S120: and selecting a first single-frequency noise value from the noise emission frequency spectrum, comparing the first single-frequency noise value with the environment comprehensive noise value under the corresponding frequency, and if the noise meets the preset requirement, judging that the noise of the sound source of the running power equipment of the power transmission and transformation project meets the mute requirement.
After obtaining the noise emission spectrum of the sound source of the running power equipment at the sound receiving point, the first 20-order frequency multiplication positions (namely 100Hz, 200Hz, 300Hz …, 150Hz, 250Hz and 350Hz …) of 50Hz in the noise emission spectrum can be selected, a single-frequency noise value with the absolute value of the difference value smaller than or equal to 2dB with the environment integrated noise value is selected as a first single-frequency noise value, and if the second difference value obtained by subtracting the first single-frequency noise value from the environment integrated noise value is larger than n dB and the value range of n is [0.5,2], the noise of the sound source of the running power equipment of the power transmission and transformation engineering is judged to meet the mute requirement.
It should be noted that the environmental integrated noise value is higher than the single-frequency noise value. Therefore, in the noise emission spectrum, two comparisons are needed, where the first comparison is to select a first single-frequency noise value (i.e., a single-frequency noise value with an absolute value of a difference from the environmental integrated noise value being less than or equal to 2 dB) that meets the requirements from the noise emission spectrum; the second comparison is to further determine whether the first single frequency noise value meets the preset requirement.
That is, a more prominent single-frequency noise value L is selected Row of rows And the environment integrated noise value L of the sound receiving point under the frequency Ring(s) In contrast, if L Ring(s) －L Row of rows Less than n dB, the electromagnetic noise of the power transmission and transformation project does not meet the mute requirement; if L Ring(s) －L Row of rows And if the electromagnetic noise is not less than n dB, the electromagnetic noise of the power transmission and transformation project meets the mute requirement. Wherein, the value range of n is [0.5,2]。
The application provides a noise mute evaluation method and device for power transmission and transformation engineering, which measure noise emission of a sound source of power equipment operated by the power transmission and transformation engineering by adopting a coherent power method. The method is based on the principle of evaluating causality between a plurality of sound sources and sound receiving points, namely, how many signals in the sound receiving points are caused by the sound sources, so as to extract a power spectrum derived from the sound source signals in the power spectrum of the sound receiving point signals. Through the mode, whether the noise emission of the power transmission and transformation project meets the mute requirement can be effectively evaluated.
Referring to fig. 2, fig. 2 is a flow chart of another embodiment of the noise mute evaluation method for power transmission and transformation project in the present application, in this embodiment, steps S210 to S240 may be included, and the same parts of this embodiment as those of the above embodiment are not repeated, where the steps of this embodiment are specifically as follows:
s210: and measuring the noise emission of the sound source of the power equipment operated by the power transmission and transformation project by adopting a coherent power method, and obtaining a noise emission frequency spectrum.
S220: and selecting a first single-frequency noise value from the noise emission frequency spectrum, comparing the first single-frequency noise value with the environment comprehensive noise value under the corresponding frequency, and if the noise meets the preset requirement, judging that the noise of the sound source of the power transmission and transformation engineering operation power equipment meets the mute requirement.
S230: and measuring the noise A sound level of the sound receiving point of the fan in the on state and the off state respectively.
S240: if the first difference between the noise A sound level of the fan in the opening state and the noise A sound level of the fan in the closing state is smaller than a preset value, judging that the noise of the fan in the power transmission and transformation project meets the mute requirement.
A sound level L of sound receiving point when fan is started Opening device A sound level L of sound receiving point when fan is closed Switch for closing In contrast, if L Opening device －L Switch for closing The noise of the power transmission and transformation project fan meets the mute requirement if the noise is less than or equal to the preset value; if L Opening device －L Switch for closing >And if the preset value is reached, the noise of the power transmission and transformation project fan does not meet the mute requirement.
In sum, when the noise of the sound source and the fan of the running power equipment meets the mute requirement, the power transmission and transformation project can be judged to meet the mute requirement.
In addition, the noise emission limit value is provided for the silent emission noise reduction design of the power transmission and transformation project. The method comprises the following steps:
1) And operating the power equipment sound source electromagnetic noise mute emission limit.
Background noise value of sound receiving point at 20-order frequency multiplication before 50HzThe mute emission limit value of the sound source of the running power equipment at 20-order frequency multiplication before 50Hz is L Limited-electric ≤L Back of body -0.59dB。
2) And the noise mute emission limit value of the fan.
The noise emission limit value of the fan isThe silent emission can be satisfied as long as the noise emission of the blower is less than or equal to the limit value.
Based on the above-mentioned power transmission and transformation project noise silence evaluation method, the present application proposes a power transmission and transformation project noise silence evaluation device, please refer to fig. 3, fig. 3 is a flow chart of an embodiment of the power transmission and transformation project noise silence evaluation device of the present application, and in this embodiment, the method specifically may include:
the electromagnetic noise measurement module is used for measuring noise emission of a sound source of power equipment operated by a power transmission and transformation project by adopting a coherent power method to obtain a noise emission frequency spectrum;
and the electromagnetic noise mute evaluation module is used for selecting a first single-frequency noise value from the noise emission frequency spectrum, comparing the first single-frequency noise value with the environment comprehensive noise value under the corresponding frequency, and judging that the noise of the power transmission and transformation project operation power equipment sound source meets the mute requirement if the noise meets the preset requirement.
Optionally, the noise silence evaluation device for the power transmission and transformation project further comprises:
the fan noise measuring module is used for measuring the noise A sound level of the sound receiving point of the fan in the opening state and the closing state respectively;
the fan noise mute evaluation module is used for judging whether the fan noise meets the mute requirement; if the first difference value between the noise A sound level of the fan in the opening state and the noise A sound level of the fan in the closing state is smaller than a preset value, judging that the noise of the fan in the power transmission and transformation project meets the mute requirement.
The electromagnetic noise mute emission limit calculation module is used for calculating mute emission limit values of electromagnetic noise such as a sound source of running power equipment;
and the fan noise mute emission limit calculation module is used for calculating the mute emission limit of the fan noise.
For a better understanding of the aspects of the present application, reference is made to the following description in connection with the embodiments.
Embodiment case 1:
the noise emission spectrum of the transformer at the factory boundary measuring point of a certain #1 power distribution room is measured by using a multiple coherent power method, as shown in fig. 4, fig. 4 is a schematic diagram of the measurement result of the multiple coherent power of the noise emission of the factory boundary at night of the power distribution room of a certain #1, wherein the upper curve is the comprehensive noise spectrum of the environment at the factory boundary, and the lower curve is the noise emission spectrum of the transformer at the factory boundary.
As can be seen from the lower graph of fig. 4, the transformer noise is more prominent at 100Hz, 200Hz, and 300Hz, and the transformer noise emission values and the environmental integrated noise values at the factory boundary at the three frequencies are shown in table 1. If n is 1dB, as can be seen from table 1, the second difference between the environmental integrated noise value and the transformer noise emission value is greater than 1dB, so that the noise emission of the transformer in the power distribution room meets the mute requirement.
TABLE 1 factory boundary Transformer noise emission and environmental Integrated noise values
The fan noise measurement results are shown in table 2, and the measuring points 1-2 are all factory boundary noise measuring points. The first difference value of the day and night factory boundary noise of the measuring points 1-2 is larger than 3dB when the fan is turned on and turned off, so that the fan noise of the power distribution room does not meet the ultra-silence requirement.
Table 2 fan noise measurements
Embodiment case 2:
the noise emission spectrum of the transformer at the factory boundary measuring point of a certain #2 power distribution room is measured by using a multiple coherent power method, as shown in fig. 5, fig. 5 is a measurement result of multiple coherent power of the noise emission of the factory boundary at night of the certain #2 power distribution room, wherein an upper curve is an environment comprehensive noise spectrum at the factory boundary, and a lower curve is a noise emission spectrum of the transformer at the factory boundary.
As can be seen from the lower graph of fig. 5, the transformer noise is more prominent at 100Hz, 200Hz, 400Hz, and the transformer noise emission values and the environmental integrated noise values at the factory boundary at the three frequencies are shown in table 3. If n is 1dB, it can be seen from table 3 that the difference between the environmental integrated noise value and the transformer noise emission value is greater than 1dB at 100Hz and 400Hz, but the difference between the environmental integrated noise value and the transformer noise emission value is less than 1dB at 200Hz, so that the transformer noise of the power distribution room does not meet the requirement of ultra-silence.
TABLE 3 factory boundary Transformer noise emission and environmental Integrated noise values
The fan noise measurement results are shown in table 4, and the measuring points 1-2 are all factory boundary noise measuring points. The noise difference value of day and night factory boundary noise of the measuring point 1 is smaller than 3dB when the fan is turned on and turned off, and the noise difference value of day and night factory boundary noise of the measuring point 2 is larger than 3dB when the fan is turned on and turned off, so that the fan noise of the power distribution room does not meet the mute requirement.
Table 4 fan noise measurements
In summary, the method and the device can accurately reflect the influence of electromagnetic noise such as a transformer and a reactor and fan noise on environmental noise, so as to accurately evaluate whether the mute requirement is met, obtain the mute emission limit value of the electromagnetic noise such as the transformer and the reactor and the fan noise, and provide a basis for the mute emission noise reduction design of power transmission and transformation engineering. The method and the device are suitable for mute evaluation of power transmission and transformation projects such as transformer substations, power distribution rooms, converter stations and the like.
It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not limiting. Further, for ease of description, only some, but not all, of the structures associated with this application are shown in the drawings. The step numbers used herein are also for convenience of description only, and are not limiting as to the order in which the steps are performed. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The terms "first," "second," and the like in this application are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.
Claims (7)
1. The power transmission and transformation project noise silence evaluation method is characterized by comprising the following steps of:
measuring noise emission of a sound source of power equipment operated by a power transmission and transformation project by adopting a coherent power method, and obtaining a noise emission frequency spectrum;
extracting a first single-frequency noise value from the noise emission frequency spectrum, comparing the first single-frequency noise value with an environment comprehensive noise value under corresponding frequency, and if the noise emission frequency spectrum meets the preset requirement, judging that the noise of the power transmission and transformation project operation power equipment sound source meets the mute requirement;
wherein, still include:
measuring the noise A sound level of the sound receiving point of the fan in the opening state and the closing state respectively;
if the first difference between the noise A sound level of the fan in the opening state and the noise A sound level of the fan in the closing state is smaller than a preset value, judging that the noise of the fan in the power transmission and transformation project meets the mute requirement;
and when the noise of the sound source of the running power equipment and the noise of the fan meet the mute requirement, judging that the power transmission and transformation project meets the mute requirement.
2. The power transmission and transformation project noise mute evaluation method according to claim 1, wherein the shell of each sound source of the running power equipment is provided with an acceleration sensor, a microphone is arranged at a sound receiving point, and a data acquisition front end is connected with the acceleration sensor and the microphone; the method for measuring the noise emission of the sound source of the power equipment operated by the power transmission and transformation project by adopting the coherent power method comprises the following steps:
and obtaining the noise emission spectrum of the running power equipment sound source at the sound receiving point through coherent power analysis.
3. The power transmission and transformation project noise silence evaluation method according to claim 2, wherein the obtaining the noise emission spectrum of the operation power equipment sound source at the sound receiving point by coherent power analysis includes:
obtaining the distance between the acceleration sensor and the sound receiving point;
and if the distance exceeds the preset distance, synchronously measuring the vibration signal of the sound source of the running power equipment and the noise signal of the sound receiving point by adopting a positioning device through a plurality of data acquisition front ends.
4. The noise mute evaluation method for power transmission and transformation project according to claim 1, wherein the measuring of noise emission of a sound source of power transmission and transformation project operation power equipment by adopting a coherent power method comprises:
suspending an acceleration sensor in a near field region of the sound source of the running power equipment; or,
and a microphone is arranged in the near-field region of the sound source of the running power equipment.
5. The method for noise mute evaluation of power transmission and transformation engineering according to claim 1, wherein the extracting a first single-frequency noise value from the noise emission spectrum comprises:
and extracting a single-frequency noise value with the absolute value of the difference value smaller than or equal to 2dB from the environment comprehensive noise value as the first single-frequency noise value at the first 20-order frequency multiplication of 50Hz in the noise emission spectrum.
6. The power transmission and transformation project noise mute evaluation method according to claim 1, wherein if the preset requirement is met, determining that the noise of the power transmission and transformation project operation power equipment sound source meets the mute requirement comprises:
if the second difference between the environmental integrated noise value and the first single-frequency noise value is greater thann dB，nThe value range of (2) is [0.5,2]]And judging that the noise of the sound source of the power equipment operated by the power transmission and transformation project meets the mute requirement.
7. The utility model provides a power transmission and transformation engineering noise silence evaluation device which characterized in that includes:
the electromagnetic noise measurement module is used for measuring noise emission of a sound source of power equipment operated by a power transmission and transformation project by adopting a coherent power method to obtain a noise emission frequency spectrum;
the electromagnetic noise mute evaluation module is used for selecting a first single-frequency noise value from the noise emission frequency spectrum, comparing the first single-frequency noise value with an environment comprehensive noise value under corresponding frequency, and judging that the noise of the power equipment sound source operated by the power transmission and transformation project meets the mute requirement if the noise meets the preset requirement;
wherein, still include:
the fan noise measuring module is used for measuring the noise A sound level of the sound receiving point of the fan in the opening state and the closing state respectively;
the fan noise mute evaluation module is used for judging whether the fan noise meets the mute requirement; if the first difference value between the noise A sound level of the fan in the opening state and the noise A sound level of the fan in the closing state is smaller than a preset value, judging that the noise of the fan in the power transmission and transformation project meets the mute requirement;
and when the noise of the sound source of the running power equipment and the noise of the fan meet the mute requirement, judging that the power transmission and transformation project meets the mute requirement.
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