CN113532635A - 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 method and a device for noise silence evaluation of power transmission and transformation engineering, 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 to obtain 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 environmental comprehensive noise value under the corresponding frequency, and if the first single-frequency noise value meets the preset requirement, judging that the noise of the sound source of the power equipment operated by the power transmission and transformation project meets the mute requirement. By means of the method, 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 power transmission and transformation project noise silence evaluation method and device.
Background
Some hospitals, sanatoriums, residences, education, scientific research and other places have higher requirements on the sound environment quality, so that the noise emission of the surrounding power transmission and transformation projects needs to be managed and controlled. How to realize mute emission (mute definition: the existence of noise in power transmission and transformation project can not be heard by human ears) for power transmission and transformation projects with noise emission main bodies is a difficult point, wherein the key point is how to evaluate whether the noise emission of the power transmission and transformation projects meets the mute requirement.
However, no noise silencing evaluation method for power transmission and transformation engineering is available at present.
Disclosure of Invention
The application provides a power transmission and transformation project noise mute evaluation method and a 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 problem, the application provides a power transmission and transformation project noise silence evaluation method, 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 to obtain 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 environmental comprehensive noise value under the corresponding frequency, and if the first single-frequency noise value meets the preset requirement, judging that the noise of the sound source of the power equipment operated by the power transmission and transformation project meets the mute requirement.
Optionally, the method for measuring noise emission of the sound source of the power equipment operated by the power transmission and transformation project by using a coherent power method includes: an acceleration sensor is arranged on a shell of a sound source of each operating power equipment, a microphone is arranged at a sound receiving point, and the front end of data acquisition is connected with the acceleration sensor and the microphone; and obtaining the noise emission spectrum of the sound source of the operating electrical equipment at the sound receiving point through coherent power analysis.
Optionally, obtaining, by coherent power analysis, a noise emission spectrum of the operating electrical equipment sound source at the sound receiving point includes: obtaining the distance between the acceleration sensor and the sound receiving point; if the distance exceeds the preset distance, the positioning device is adopted to realize synchronous measurement of the vibration signals of the sound source of the operating power equipment and the noise signals of the sound receiving points by the data acquisition front ends.
Optionally, the method for measuring noise emission of the sound source of the power equipment operated by the power transmission and transformation project by using a coherent power method includes: suspending an acceleration sensor in a near field area where a sound source of the electrical equipment is operated; alternatively, microphones are placed in the near field region where the electrical equipment sound source is operating.
Optionally, the method further comprises: respectively measuring the noise level A of a sound receiving point of the fan in an opening state and a closing state; and 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 the preset value, judging that the noise of the fan of the power transmission and transformation project meets the mute requirement.
Optionally, the method further comprises: and when the sound source of the operating power equipment and the noise of the fan meet the silencing requirement, judging that the power transmission and transformation project meets the silencing requirement.
Optionally, selecting a first single frequency noise value from the noise emission spectrum comprises: and extracting a single-frequency noise value of which the absolute value of the difference value with the environmental comprehensive noise value is less than or equal to 2dB at the first 20-order frequency multiplication of 50Hz in the noise emission spectrum 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 transmission and transformation project operation power equipment meets the mute requirement includes: and if a second difference value obtained by subtracting the first single-frequency noise value from the environment comprehensive noise value is larger than ndB, and the value range of n is [0.5,2], judging that the noise of the sound source of the power equipment in the operation of the power transmission and transformation project meets the mute requirement.
In order to solve the above technical problem, the present application provides a power transmission and transformation engineering noise silence evaluation device, including: the electromagnetic noise measurement module is used for measuring the noise emission of a sound source of the power equipment operated by the 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 environmental comprehensive noise value under the corresponding frequency, 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 if the preset requirement is met.
Optionally, the method further comprises: the fan noise measurement module is used for measuring the noise A sound levels of sound receiving points of the fan in an opening state and a closing state respectively; the fan noise mute evaluation module is used for judging whether the fan noise meets the mute requirement; and 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 the preset value, judging that the noise of the fan in the power transmission and transformation project meets the mute requirement.
The application provides a power transmission and transformation project noise silence evaluation method and device, and the noise emission of a power equipment sound source during power transmission and transformation project operation is measured by adopting a coherent power method. The method is characterized in that causality between a plurality of sound sources and sound receiving points is evaluated, namely how many signals in the sound receiving points are caused by the sound sources, so that a power spectrum derived from the sound source signals in the power spectrum of the sound receiving point signals is extracted. By means of the method, 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 solution of the present application, the drawings needed to be used 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow chart of an embodiment of a noise silencing evaluation method for power transmission and transformation engineering according to the present application;
FIG. 2 is a schematic flow chart illustrating another embodiment of the noise silencing evaluation method for power transmission and transformation engineering according to the present application;
fig. 3 is a schematic flow chart of an embodiment of the noise silencing evaluation device for power transmission and transformation engineering according to the present application;
FIG. 4 is a diagram illustrating the measurement results of multiple coherent power of factory noise emission at night in a #1 distribution room;
fig. 5 shows the measurement results of factory noise emission multiple coherent power at night in a #2 distribution room.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present application, the method and apparatus for evaluating noise silence in 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 the noise muting evaluation method for power transmission and transformation projects, where in this embodiment, the evaluation method may include steps S110 to S120, and each step is 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 to obtain a noise emission frequency spectrum.
The principle of the coherent power method is to evaluate causality between a plurality of sound sources and a sound receiving point, namely how many signals are caused by the sound sources in the sound receiving point, so as to extract a power spectrum derived from the sound source signal in the power spectrum of the sound receiving point signal. Wherein, the sound source of the operating power equipment can be equipment such as a transformer, a reactor and the like.
Specifically, an acceleration sensor is attached to a shell of each sound source of the operating power equipment, a microphone is arranged at a sound receiving point, and the front end of data acquisition is connected with the acceleration sensor and the microphone. If the distance between the sound source of the operating power equipment and the sound receiving point is too far, the vibration signals of the sound source and the noise signals of the sound receiving point can be synchronously measured by a plurality of data acquisition front ends by adopting positioning devices such as a GPS or a Beidou.
In addition, if the safe distance cannot be in direct contact with the sound source of the operating electrical equipment, the acceleration sensor can be suspended in the near field area of the sound source of the operating electrical equipment, or the microphone can be placed in the near field area of the sound source of the operating electrical equipment.
In the above, through coherent power analysis, the noise emission spectrum of the sound source of the operating electrical equipment at the sound receiving point is obtained. The data processing adopts Fast Fourier Transform (FFT) spectrum 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 environmental comprehensive noise value under the corresponding frequency, and if the first single-frequency noise value meets the preset requirement, judging that the noise of the running power equipment sound source of the power transmission and transformation project meets the mute requirement.
After the noise emission frequency spectrum of the operating power equipment sound source at the sound receiving point is obtained, the first 20-order frequency doubling positions (namely 100Hz, 200Hz, 300Hz …, 150Hz, 250Hz and 350Hz …) of 50Hz in the noise emission frequency spectrum can be selected, a single-frequency noise value of which the absolute value of the difference value with the environment comprehensive noise value is less than or equal to 2dB 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 comprehensive noise value is less than ndB and the value range of n is [0.5,2], the noise of the operating power equipment sound source of the power transmission and transformation project 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, 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 value with the environmental integrated noise value less than or equal to 2 dB) meeting the requirement from the noise emission spectrum; the second comparison is to further determine whether the first single-frequency noise value meets the predetermined requirement.
That is, the more prominent single-frequency noise value L is selectedRow boardIntegrated noise value L with the environment of the sound receiving point at that frequencyRing (C)By contrast, if LRing (C)－LRow boardIf the noise is less than n dB, the electromagnetic noise of the power transmission and transformation project does not meet the mute requirement; if L isRing (C)－LRow boardMore than or equal to n dB, the electromagnetic noise of the power transmission and transformation project is fullAnd (4) meeting the requirement of sufficient silence. Wherein, the value range of n is [0.5,2]]。
The application provides a power transmission and transformation project noise silence evaluation method and device, and the noise emission of a power equipment sound source during power transmission and transformation project operation is measured by adopting a coherent power method. The method is characterized in that causality between a plurality of sound sources and sound receiving points is evaluated, namely how many signals in the sound receiving points are caused by the sound sources, so that a power spectrum derived from the sound source signals in the power spectrum of the sound receiving point signals is extracted. By means of the method, 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 schematic flow chart of another embodiment of the noise muting evaluation method for power transmission and transformation engineering of the present application, and in this embodiment, steps S210 to S240 may be included, and the same parts in this embodiment as those in the above embodiment are not described again, and the steps in 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 to obtain 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 environmental comprehensive noise value under the corresponding frequency, and if the first single-frequency noise value meets the preset requirement, judging that the noise of the sound source of the power equipment operated by the power transmission and transformation project meets the mute requirement.
S230: and respectively measuring the sound level of the noise A of the sound receiving point of the fan in the opening state and the closing state.
S240: and 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 the preset value, judging that the noise of the fan of the power transmission and transformation project meets the mute requirement.
Sound level L of sound receiving point A when fan is startedOpening deviceSound level L of sound receiving point when fan is closedClosing deviceBy contrast, if LOpening device－LClosing deviceIf the value is less than or equal to the preset value, the noise of the fan of the power transmission and transformation project meets the mute requirement; if L isOpening device－LClosing device>And if the numerical value is preset, the noise of the fan of the power transmission and transformation project can not meet the mute requirement.
In conclusion, when the noise of the sound source of the operating power equipment and the noise of the fan meet the silencing requirement, it can be judged that the power transmission and transformation project meets the silencing requirement.
In addition, the noise emission limit value is provided for the mute emission noise reduction design of the power transmission and transformation project. The method comprises the following specific steps:
1) and operating a power equipment sound source electromagnetic noise mute emission limit value.
Background noise value of sound receiving point at 20-order frequency multiplication before 50Hz
The mute emission limit of the sound source of the operating electrical equipment at 20 order frequency multiplication before 50Hz is LLimited electricity≤LBack of body-0.59dB。
2) A fan noise silence emission limit.
The noise emission limit of the fan is
The silent emissions can be met as long as the noise emissions of the fan are less than or equal to the limit.
Based on the above power transmission and transformation project noise silence evaluation method, the present application provides a power transmission and transformation project noise silence evaluation device, please refer to fig. 3, fig. 3 is a flowchart 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 includes:
the electromagnetic noise measurement module is used for measuring the noise emission of a sound source of the power equipment operated by the 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 environmental comprehensive noise value under the corresponding frequency, 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 if the preset requirement is met.
Optionally, the power transmission and transformation project noise silencing evaluation device further includes:
the fan noise measurement module is used for measuring the noise A sound levels of sound receiving points of the fan in an opening state and a closing state respectively;
the fan noise mute evaluation module is used for judging whether the fan noise meets the mute requirement; and 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 the 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 value calculation module is used for calculating mute emission limit values of electromagnetic noise such as a sound source of operating power equipment;
and the fan noise mute emission limit value calculation module is used for calculating the mute emission limit value of the fan noise.
For a better understanding of the solution of the present application, the following description is given in conjunction with the embodiments.
Example 1:
the noise emission spectrum of the transformer at the measuring point of the factory boundary 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 certain #1 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 curve of FIG. 4, the transformer noise is more prominent at 100Hz, 200Hz, and 300Hz, and the values of the transformer noise emission and the environmental integrated noise at the plant 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 transformer noise emission of the distribution room meets the mute requirement.
TABLE 1 values of noise emission and environmental noise for a boundary transformer
The fan noise measurement result is shown in a table 2, and the measuring points 1-2 are factory boundary noise measuring points. Noise first difference values of day and night factory boundary noise of the measuring points 1-2 when the fan is turned on and turned off are larger than 3dB, and therefore the fan noise of the power distribution room cannot meet the ultra-silence requirement.
TABLE 2 Fan noise measurements
Example 2:
the noise emission spectrum of the transformer at the measuring point of the factory boundary 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 noise emission of the factory boundary at night of a 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 curve of FIG. 5, the transformer noise is more prominent at 100Hz, 200Hz, and 400Hz, and the values of the transformer noise emission and the environmental integrated noise at the plant boundary at the three frequencies are shown in Table 3. If n is 1dB, as can be seen from table 3, the difference between the environmental integrated noise value and the transformer noise emission value at 100Hz and 400Hz is greater than 1dB, but the difference between the environmental integrated noise value and the transformer noise emission value at 200Hz is less than 1dB, so that the transformer noise of the distribution room does not meet the ultra-silence requirement.
TABLE 3 values of noise emission and environmental noise for a Transformer in the factory boundary
The fan noise measurement results are shown in a table 4, and the measuring points 1-2 are factory boundary noise measuring points. The noise difference value of the factory boundary noise of the measuring point 1 in day and night when the fan is started and closed is smaller than 3dB, and the noise difference value of the factory boundary noise of the measuring point 2 in day and night when the fan is started and closed is larger than 3dB, so that the fan noise of the power distribution room can not meet the mute requirement.
TABLE 4 Fan noise measurements
In conclusion, the influence of electromagnetic noise such as a transformer and an electric reactor and fan noise on environmental noise can be accurately reflected, so that whether the mute requirement is met or not is accurately evaluated, the mute emission limit values of the electromagnetic noise such as the transformer and the electric reactor and the fan noise are obtained, and a basis is provided for the mute emission noise reduction design of power transmission and transformation engineering. The application is suitable for mute evaluation of power transmission and transformation projects such as transformer substations, power distribution rooms and converter stations.
It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. In addition, for convenience of description, only a part of structures related to the present application, not all of the structures, are shown in the drawings. The step numbers used herein are also for convenience of description only and are not intended as limitations on the order in which the steps are performed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively 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 can be included in at least one embodiment of the application. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A power transmission and transformation project noise silence evaluation method is characterized by comprising 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 to obtain a noise emission frequency spectrum;
and 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 a corresponding frequency, and if a preset requirement is met, judging that the noise of the sound source of the power transmission and transformation project operation power equipment meets a mute requirement.
2. The power transmission and transformation project noise silencing evaluation method according to claim 1, wherein an acceleration sensor is arranged on a shell of a sound source of each operating power equipment, a microphone is arranged at a sound receiving point, and a data acquisition front end is connected with the acceleration sensor and the microphone; adopt the noise emission of coherent power method measurement transmission and transformation engineering operation power equipment sound source, include:
and obtaining the noise emission frequency spectrum of the sound source of the operating electric equipment at the sound receiving point through coherent power analysis.
3. The noise silencing evaluation method for electric transmission and transformation project according to claim 2, wherein the obtaining the noise emission spectrum of the operating electric equipment sound source at the sound receiving point by coherent power analysis comprises:
obtaining the distance between the acceleration sensor and the sound receiving point;
if the distance exceeds the preset distance, a positioning device is adopted to realize synchronous measurement of the vibration signals of the sound source of the operating power equipment and the noise signals of the sound receiving points by a plurality of data acquisition front ends.
4. The transmission and transformation project noise silencing evaluation method according to claim 1, wherein the measuring of the noise emission of the sound source of the power equipment operated by the transmission and transformation project by using the coherent power method comprises:
suspending an acceleration sensor in a near field area of a sound source of the operating electrical equipment; or,
and a microphone is arranged in a near field area of a sound source of the operating power equipment.
5. The transmission and transformation project noise silencing evaluation method according to claim 1, further comprising:
respectively measuring the noise level A of a sound receiving point of the fan in an opening state and a closing state;
and 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 of the power transmission and transformation project meets the mute requirement.
6. The transmission and transformation project noise silencing evaluation method according to claim 5, further comprising: and when the noise of the running power equipment sound source and the noise of the fan meet the silencing requirement, judging that the power transmission and transformation project meets the silencing requirement.
7. The method according to claim 1, wherein the selecting a first single-frequency noise value from the noise emission spectrum includes:
and extracting a single-frequency noise value of which the absolute value of the difference value with the environment comprehensive noise value is less than or equal to 2dB at the first 20-order frequency multiplication of 50Hz in the noise emission frequency spectrum as the first single-frequency noise value.
8. The method for evaluating the noise silence of the power transmission and transformation project according to claim 1, wherein if the preset requirement is met, the step of judging that the noise of the sound source of the power equipment operated by the power transmission and transformation project meets the silence requirement comprises the following steps:
and if the second difference value of the environment comprehensive noise value and the first single-frequency noise value is greater than ndB, and the value range of n is [0.5,2], judging that the noise of the sound source of the power transmission and transformation project operation power equipment meets the mute requirement.
9. 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 the noise emission of a sound source of the power transmission and transformation project power operation equipment 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 environmental comprehensive noise value under the corresponding frequency, and judging that the noise of the sound source of the power transmission and transformation project power operation equipment meets the mute requirement if the preset requirement is met.
10. The noise silencing evaluation device for electric transmission and transformation engineering according to claim 9, further comprising:
the fan noise measurement module is used for measuring the noise A sound levels of sound receiving points of the fan in an opening state and a closing state respectively;
the fan noise mute evaluation module is used for judging whether the fan noise meets the mute requirement or not; and 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 of the power transmission and transformation project meets the mute requirement.
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