CN106285083A - A kind of transformer station noise-reduction method - Google Patents

Abstract

The invention relates to a noise reduction method for a substation. According to the construction drawings and equipment list of the substation, the method grasps the main sound source equipment and structural layout of the substation, selects a reference station, and predicts the noise of the new substation through field measurement and noise map technology. Spectrum characteristics of noise and laws of propagation influence, selection and application design of low-frequency noise-reducing and sound-absorbing materials, structures and devices, combined with finite element simulation analysis, taking into account the multi-field coupling of sound field, flow field and thermal effect, to meet the requirements of noise reduction, heat dissipation, wind The road optimization factors are used to carry out scheme simulation optimization design, and reduce the noise emission at the station boundary from the aspects of sound absorption, sound insulation and noise elimination. After the construction is completed, the measured noise at the station boundary is 43.61dB, which meets the standard of Class I acoustic environment functional area. The method provided by the invention can effectively control the noise emission at the station boundary, and provide reference for the design of the same type of substation under the situation of increasingly stringent environmental protection requirements.

Description

A noise reduction method for a substation

technical field

The invention relates to a noise control technology and specifically designs a noise reduction method for a substation.

Background technique

Noise sources in substations include main transformers, grounding transformers, capacitors, busbars, line gates, switch gates and other sound source equipment. Among them, the main transformer is the main noise source of the substation, and its noise level is positively correlated with the power load. Under daily operating conditions, the near-field noise level of the main transformer can reach above 65-67dB(A). After calculation, it is estimated that the near-field instantaneous noise level can reach 69-72dB(A) under the peak power consumption operating condition. . Moreover, the vibration of the iron core of the main transformer will also cause some floor resonance in the main transformer room, and generate low-frequency secondary structure noise. The equipment noise of the main transformer and the noise of the secondary structure work together to have a great impact on the surrounding environment.

In the actual operation of the substation, a certain amount of noise is also generated when the capacitor and the busbar are working, and the near-field noise level generally varies between 50 and 56dB(A).

After the actual test and analysis of the substation, it is judged that the overall noise characteristics of the substation are dominated by the electromagnetic vibration noise induced by the iron core of the substation equipment, and there is a certain amount of secondary structure noise. The noise spectrum features are dominated by low-frequency noise, accompanied by a certain amount of high-order harmonic noise.

The surrounding areas of substations are residential areas and concentrated areas of government agencies and institutions, and the requirements for noise emission limits are relatively high. At this time, if only the design scheme of electrical performance indicators of substations is considered, it is proved that it is difficult to control the noise level at the station boundary. Therefore, it is necessary to carry out noise reduction projects and take relevant noise control measures.

Commonly used rock wool sound-absorbing materials only have obvious sound-absorbing effects on high-frequency noise, and quickly fail after being exposed to moisture, which cannot meet the noise reduction requirements and service requirements of substations. Although materials such as aluminum foam and sprayed fiber can control low-frequency noise, the cost is too high, and the sound absorption peak curve cannot cover the frequency of high-order harmonic noise, so the comprehensive noise reduction effect is not obvious. For this reason, it is necessary to combine the main sound source characteristics in the design of noise reduction, and focus on relevant measures to improve the design.

Contents of the invention

In order to solve the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a noise reduction method for substations. The method adheres to the concept of green environmental protection, adopts new materials, new technologies, and new processes to design noise reduction for newly-built substations, and effectively controls Reduced station boundary noise emissions.

The object of the present invention is to adopt following technical scheme to realize:

The invention provides a noise reduction method for a substation, which is a noise reduction method for a new substation plan, and is characterized in that the method includes the following steps:

(1) Select a reference station to predict the noise spectrum characteristics and propagation influence law of the substation;

(2) Selection and application design of noise-reducing and sound-absorbing materials (frequency range 20-200Hz) and devices;

(3) Determine the comprehensive noise reduction scheme based on finite element analysis.

Further, in the step (1), investigate the structural layout of the substation and the voltage level, brand model and manufacturer information of the sound source equipment, then select a reference station with the same scheme as the structural layout of the substation, and use the acoustic The level meter measures and analyzes the near-field and far-field noise of the sound source equipment in the reference station and the station boundary noise of the reference station, and draws a noise map of the reference station (using the noise prediction and evaluation software Sound-plan, the environmental noise simulation software Cadna- A or Lima draws the noise map of the reference station), as the analysis basis of the noise spectrum characteristics and propagation influence law of the substation;

Use the sound level meter to measure the frequency spectrum of the noise in the reference station and station boundary, and determine the distribution frequency band of the noise sound energy. 3. The noise reduction method according to claim 2, characterized in that, according to the noise map of the reference station, the key nodes capable of effective noise control are analyzed, including noise sources, noise propagation paths and noise sensitive points, and the main transformer is observed The far and near field noise level of its cooling system, the noise level and propagation attenuation characteristics of the doors and windows of the main transformer room, the entrance of the air intake and exhaust channels, and the 50m around the station boundary.

Further, in the step (2), the noise reduction and sound absorption material, structure and device selection and application design are carried out according to the noise characteristics of the substation; the sound absorption peak curve of the noise reduction and sound absorption material covers the distribution of noise sound energy The frequency band, its structure and devices meet the requirements of being installed at key nodes without affecting the normal operation of electrical equipment in the station.

Further, the noise-reducing and sound-absorbing material adopts the form of the sound-absorbing wall of the structure, and the double-resonance low-frequency composite sound-absorbing material composed of the micro-perforated plate and the aluminum fiber board is arranged on the indoor wall of the substation. The noise-reducing and sound-absorbing material is used for When the low-frequency sound absorption is 100Hz, the noise-reducing and sound-absorbing material has a sound absorption coefficient of 0.3 or more; when the noise-reducing and sound-absorbing material is used for 100-1600Hz high-frequency sound absorption, it must have a sound absorption coefficient of not less than 0.6 sound-absorbing material.

Further, the noise-reducing and sound-absorbing material is a microporous-fiber composite sound-absorbing material, and is processed into a sound-absorbing wall, a sound-absorbing and insulating door, and a muffler device.

Further, in the step (3), combined with finite element simulation analysis, taking into account the multi-field coupling of sound field, flow field and thermal effect, and satisfying the factors of noise reduction, heat dissipation and wind path optimization, the scheme simulation optimization design is carried out, and the sound absorption-sound insulation -Comprehensive design scheme of noise control for noise reduction.

Further, the noise control comprehensive design scheme of sound absorption-sound insulation-muffling includes: the installation of the cable interlayer air inlet and exhaust muffler system in the substation; the installation of the exhaust muffler system on the top of the main transformer room; the main transformer Installation of indoor sound-absorbing wall and noise reduction system, and installation of sound-proof doors in the main transformer room.

Further, the installation of the cable interlayer air intake and exhaust muffler system in the substation includes: installing a silencing static plenum box, a muffler elbow, and 1 to 6 low-noise fans in the substation cable interlayer air intake and exhaust channels, and the fan noise is low. at 60dB;

The installation of the exhaust and muffler system on the top of the main transformer room includes: 3 to 6 ventilation openings are arranged on the single side wall of each main transformer room, and 1 to 3 ventilation openings with a diameter of 0.5m are opened on the roof of each main transformer room. Ventilation port; and install anechoic static pressure box, muffler and 1 to 6 low-noise fans, the fan noise is lower than 60dB;

The installation of the sound-absorbing wall in the main transformer room and the sound-absorbing system includes: the noise-reducing sound-absorbing material is arranged on the wall of the main transformer room in the form of a frame sound-absorbing wall; Pressure box, muffler, muffler elbow and 2 to 6 low-noise fans, the fan noise is lower than 60dB;

The installation of the sound insulation door of the transformer room includes: installing a split sound insulation door on the outside of the original gate, and designing 1 to 3 sound insulation doors for each main transformer room; Noise-reducing and sound-absorbing materials are placed inside the sound-proof door to ensure the dual functions of sound insulation and low-frequency sound-absorbing of the sound-proof door body; a lightweight sound-insulation wall is designed above the sound-proof door, and noise-reducing and absorbing Acoustic material; combine the sound absorption effect and bearing support condition design margin, so that the wall has sound insulation and low-frequency sound absorption effect; the sound insulation door is fixed by pre-embedded structure; The buried structure jointly supports the lightweight sound insulation wall above to ensure the safe and reliable use of the overall structure.

Compared with the closest prior art, the excellent effect that the technical solution provided by the present invention has is:

1. The present invention predicts the noise impact of the new substation by investigating the reference station, so that noise control measures can be proposed before the construction of the substation, comprehensively considering the noise reduction performance, economic evaluation and impact on substation operation , to formulate a reasonable construction plan.

2. The new material is an environmentally friendly material. Compared with the currently widely used noise-reducing and sound-absorbing materials such as rock wool and glass wool, it will not produce inorganic dust to pollute the environment, and has the environmental protection characteristics of being recyclable and reused many times; the new material It is a metal fiber material, which has incomparable advantages in terms of mechanical strength and aging resistance compared with traditional inorganic noise-reducing and sound-absorbing materials. At the same time, the use performance will not be affected in any conditions such as humidity, dryness, high temperature, severe cold, sand and dust, high ultraviolet rays, acid and alkali corrosion, and has excellent use reliability.

3. Simulation-based noise reduction design and structural design: Combined with foreign advanced technology and methods, comprehensively consider the influence of sound field and flow field related characteristics, realize simulation technology based on substation characteristics, apply it to substation noise reduction design, and truly realize noise reduction Accurately match the target of noise design; according to the substation equipment layout and sound field simulation results, design the structural form and installation layout of the noise reduction facilities without affecting the substation's operation function.

4. Safety protection features: Considering the substation's requirements for safe operation and emergency situations, this noise reduction design analyzes the safety emergency situation of the main transformer room, and the relevant design takes into account the oil discharge of the transformer oil tank, excessive temperature of the transformer, and fire in the substation Wait for an emergency.

5. The present invention adheres to the concept of environment-friendly development, in line with the purpose of promoting the concept of green ecology and environmental protection to the whole society, and demonstrates the science, Reasonable use, environment-friendly low-noise substations play a leading role in the demonstration construction of environmental protection in power transmission and transformation projects.

Description of drawings

Fig. 1 is the main transformer measuring point position figure provided by the present invention; Wherein: (a) is the 2# main transformer measuring point position figure; (b) is the 3# main transformer measuring point position figure;

Fig. 2 is each measuring point spectrogram of main transformer provided by the present invention; Wherein: (a) is the spectrogram of 2# main transformer measuring point 1 and 2; (b) is the spectrogram of 2# main transformer measuring point 3 and 4 ; (c) is the frequency spectrum of 3# main transformer measuring points 5 and 6; (d) is the frequency spectrum of 3# main transformer measuring points 7 and 8;

Fig. 3 is the microporous composite sound-absorbing material/structure sound absorption coefficient graph provided by the present invention;

Fig. 4 is a station boundary measurement position diagram provided by the present invention;

Fig. 5 is the frequency spectrum diagram of station boundary measuring point provided by the present invention;

Fig. 6 is a spectrum diagram of environmental background noise provided by the present invention.

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. These embodiments of the present invention may be referred to herein, individually or collectively, by the term "invention", which is for convenience only and is not intended to automatically limit the application if in fact more than one invention is disclosed The scope is any individual invention or inventive concept.

The invention provides a noise reduction method for a substation. The method first needs to grasp the main sound source equipment and structural layout of the substation according to the civil engineering drawings of the substation construction and the equipment list to be purchased, and select a reference station. Through on-site measurement and Noise map technology, predicting the noise spectrum characteristics and propagation influence rules of new substations, from which the selection and application design of low-frequency noise-reducing and sound-absorbing materials, structures and devices, combined with finite element simulation analysis, taking into account the sound field, flow field, and thermal effects Multi-field coupling, satisfying multiple factors of noise reduction, heat dissipation, and wind path optimization for scheme simulation optimization design. After the construction is completed, the noise at the station boundary is measured to be 43.61dB(A) (dB(A) means the sound power level;), which meets the standard of Class I acoustic environment functional area. The method adheres to the concept of green environmental protection, adopts new materials, new technologies, and new processes to design noise reduction for newly-built substations, effectively controls the noise emission at the station boundary, and has great application potential under the situation of increasingly stringent environmental protection requirements. As a reference for the noise reduction design of similar substations.

Embodiment one

The invention provides a noise control design method for a newly-built substation. The method is based on general design, referring to station B with the same scheme as station A, and pre-evaluating the noise emission status of station A through the investigation of station B, so as to grasp Spectrum and intensity of the sound source at station A; aiming at the expected control target of noise, new sound-absorbing materials with specific frequency spectrum and advanced simulation technology are adopted, and new sound-absorbing materials are combined with other auxiliary noise reduction measures to control substation noise. The specific program steps are:

(1) Investigation and evaluation of substation noise:

Use the sound level meter to measure and analyze the near-field noise of the main sound source equipment in station B and the station boundary noise of the substation, and analyze the noise spectrum characteristics in combination with relevant literature; according to the measured data, use advanced noise map analysis technology to draw a noise map in the station, Analyze the influence law of noise propagation in the station.

(2) Selection and application design of new low-frequency noise-reducing and sound-absorbing materials and devices:

Through the noise spectrum chart measured by the sound level meter, it is found that the noise of this station is mainly low-frequency noise, and the sound energy is mainly distributed at 50, 100, 200, and 300 Hz. As the frequency increases, the sound energy gradually decreases, but at about 1300 Hz There is a clear rise.

Considering the characteristics of low-frequency and wide-band noise in the station, the selected sound-absorbing materials should have good low-frequency sound-absorbing performance and a wide sound-absorbing frequency band, and meet the service conditions in the station (good durability and fire resistance). It was decided to adopt the form of the sound-absorbing wall of the frame, and the double-resonance new low-frequency composite sound-absorbing material/structure composed of the micro-perforated plate and the aluminum fiber board was arranged on the indoor wall to maximize the low-frequency sound absorption effect of the substation and reduce the main transformer. room sound field energy. The material/structure focuses on low-frequency sound absorption, and has a sound absorption coefficient of more than 0.3 at 100Hz. In addition, it has a high sound absorption coefficient (not less than 0.6) at 100-1600Hz, and the sound-absorbing panel is an all-aluminum structure. , non-combustible, non-mildew, non-rot, light weight, beautiful. By changing the fiber diameter, porosity and plate thickness of the fiberboard, its acoustic impedance characteristics can be changed; by adjusting the distance between the microporous plate and the fiberboard, and the thickness of the back cavity of the composite sound-absorbing panel, its acoustic impedance characteristics can be changed. Therefore, combined with the acoustic impedance matching theory, the peak coverage of the sound absorption coefficient curve can be flexibly adjusted by controlling the process parameters of the microporous fiber composite sound-absorbing panel. The noise frequencies mainly controlled this time are 50, 100, 200 and 300Hz, so the selected composite sound-absorbing panels have excellent sound-absorbing performance in this frequency band.

According to the analysis of the noise map in the station, it can be seen that the air intake and exhaust passages of the main transformer room and the cable interlayer are the main way for the noise in the main transformer room to spread outward, and it is necessary to block the exchange of sound energy between the indoor substation equipment and the outdoors through sound insulation doors and mufflers. And reduce the structural noise generated by the vibration of the fan through the vibration isolator.

(3) Comprehensive noise reduction scheme based on finite element analysis:

According to the actual conditions of the substation's civil structure, equipment distribution, environmental requirements, etc., using the system's simulation technology, the sound field, flow field, and thermal field in the substation are accurately analyzed, and combined with theory and practical experience, the sound absorption- Sound insulation - noise reduction comprehensive design scheme of noise control. Mainly include: installation of cable interlayer air inlet and exhaust muffler system; installation of roof exhaust muffler system of main transformer room; installation of sound-absorbing wall and muffler system in main transformer room; installation of sound insulation door of main transformer room.

In addition to meeting the noise reduction requirements of substations, the noise reduction design also analyzes the safety emergency situation of the main transformer room: the design will not affect the oil storage and oil discharge functions of the oil storage pit (the original design structure is not changed), the transformer The ventilation and heat dissipation system fully meets the heat dissipation needs of the transformer, and the materials used in the noise reduction design are all non-combustible or flame-retardant materials, which can effectively ensure safety in response to emergency situations such as fires.

Embodiment two

1. Measurement and analysis of substation noise:

This project takes station B as an analogy object, and predicts noise emission for station A, so as to grasp the frequency spectrum and intensity of the sound source at station A. The location of main transformer measuring points is shown in Figure 1 (1#, 4# have no main transformer). When measuring, the measuring point is 1.5 meters above the ground and 1.5 meters away from the main transformer oil tank shell. Fig. 2 is each measuring point spectrogram of main transformer provided by the present invention; Wherein: (a) is the spectrogram of 2# main transformer measuring point 1 and 2; (b) is the spectrogram of 2# main transformer measuring point 3 and 4 ; (c) is the frequency spectrum of measuring points 5 and 6 of the 3# main transformer; (d) is the frequency spectrum of measuring points 7 and 8 of the 3# main transformer.

It can be seen from the noise spectrum that the main noise of this station is concentrated in the low frequency noise below 1000Hz, among which there are relatively obvious peaks at 100Hz, 200Hz, 315Hz, and 630Hz. It can be seen that the resonance frequency is mainly concentrated in the power frequency and high-order resonance harmonic frequency.

2. Analysis of environmental impact:

According to the environmental noise data at the factory boundary of station B, the environmental impact of station A is compared. It can be seen from the noise map that the near-field noise level of 2# main transformer room and 3# main transformer room reaches up to 64dB. ~54dB, which still exceeds the emission limit of Class I acoustic environment functional zone. When the cooling fan is turned on, the acoustic environment in the station will further deteriorate, and the influence range of 64dB noise will be expanded. Noise is mainly transmitted through the main transformer room door and exhaust outlets, and noise reduction facilities need to be installed in a targeted manner.

According to "GB3096-2008 Acoustic Environmental Quality Standard", "GB12348-2008 Environmental Noise Emission Standard for Industrial Enterprise Boundary" and "GB/T 15190 Technical Specification for Division of Applicable Areas for Environmental Noise in Urban Areas", the outside of the analog substation boundary should be designed as I Class I acoustic environment functional area, in accordance with the requirements of the national Class I acoustic environmental functional area, under daily operating conditions, the environmental noise of Station A is expected to exceed the national noise standard limit by 8-9dB(A); The excess level may reach 12dB(A) or higher, so there is a need for noise control.

3. Application of new low-frequency composite sound-absorbing materials/structures:

The new low-frequency composite sound-absorbing material/structure of the present invention adopts a double-resonance structure composed of a micro-perforated resonant sound-absorbing structure and an aluminum fiber resonant sound-absorbing structure, so as to maximize the low-frequency sound-absorbing coefficient of the sound-absorbing material and expand the absorption frequency band. The sound absorption coefficient curve of this material/structure is shown in Figure 4. It can be seen from the figure that this material focuses on low-frequency sound absorption, and has a sound absorption coefficient of more than 0.3 at 100Hz. High sound absorption coefficient (not less than 0.6). It is especially suitable for low-frequency noise control in power industry fields such as substations. Moreover, this material is an all-aluminum structure, which has good weather resistance, excellent heat dissipation, and is easy to recycle.

4. Substation noise control project:

Considering the noise characteristics of the substation, the environmental impact status and the characteristics of the site space environment, the noise control of the substation will focus on the electromagnetic vibration noise generated by the main transformer iron core excitation and the secondary structural noise generated by the vibration excitation, and through the perfect sound field , flow field and thermal effect matching design, realize the perfect fit of social environmental benefits and economic benefits of the substation, and ensure a good living environment for surrounding residents.

According to the actual conditions of substation equipment distribution, building structure, environmental requirements, etc., the following design contents are proposed:

(1) Indoor sound field optimization and noise reduction in the main transformer room:

The sound field optimization design of the main transformer room is an important part of substation noise control. The purpose of indoor sound field optimization is: on the one hand, effectively eliminate the "standing wave" and "reverberation" effects in the main transformer room, and reduce the noise level of indoor sound sources; on the other hand, effectively absorb low-frequency noise that is difficult to eliminate by ordinary noise reduction methods , to prevent low-frequency noise from spreading to the outside, and achieve a good noise control effect.

At present, the internal dimensions of the main transformer room of the substation are 7.8m×9m×9.5m, with a rectangular structure. According to the principles of room acoustics, this structural feature will cause obvious "standing wave" and "reverberation" effects in the room, and amplify the noise level of the sound source equipment. In order to effectively absorb low-frequency noise and reduce indoor noise levels, it is necessary to optimize the design of the indoor sound field in a targeted manner, and place sound-absorbing materials with high low-frequency sound-absorbing effects at key positions, which makes the location of the sound field a key factor in noise reduction design. The essential.

For this reason, this design first calculates the sound source characteristics and sound field distribution of the main transformer room, and analyzes and reconstructs the indoor sound field mode and sound pressure change law through the indoor acoustic simulation calculation analysis and actual experience analysis. And determined the main directions and parameters that affect the change of the sound field.

Combining theory and practical experience, the most critical position affecting the indoor noise of the main transformer is located on the wall around the main transformer equipment. Calculated by theoretical and empirical formulas, the lower limit of the wall area (single room) involved is about 129.36m ² , and the height range is about 3.86m (the height of some locations should be adjusted appropriately due to the safety distance). During the implementation of the project, because Party A has consistent requirements on the appearance, the sound-absorbing wall surface was raised to 5.5 meters.

In view of this, according to the sound absorption characteristics of the new low-frequency composite sound-absorbing material/structure and the actual engineering needs of the main transformer room (design margin and Party A's appearance requirements), the wall surface of the single-room main transformer room is designed and arranged with a new sound-absorbing material/structure area 185m ² , the sound-absorbing material/structure will be arranged on the indoor wall in the form of a frame sound-absorbing wall surface, the sound-absorbing material/structure height is 5.5m, and it will be arranged along the wall of the main transformer room. The total thickness of the sound-absorbing wall shall not exceed 0.16m. According to the design and calculation, the new sound-absorbing material/structural wall can effectively absorb the low-frequency noise emitted by the main transformer, control the reflection, scattering and transmission effects of indoor sound waves, and achieve the design goal of indoor sound absorption and noise reduction.

(2) Sound insulation and noise reduction in the main transformer room:

The sound insulation and noise reduction design of the main transformer room is mainly aimed at the inspection door on the north and south sides of the main transformer room, which is the weak link of sound insulation. Since the sound energy exchange between the main transformer room and the outside world can be transmitted through this weak link, sound insulation treatment is required. In this project, the maintenance door of the main transformer room is replaced with a high-efficiency sound insulation door to prevent noise from being transmitted to the outside through the door. The specific steps are as follows: install a split sound insulation door outside the original gate, and design 1 to 3 sound insulation doors for each main transformer room. The door body is compounded with new sound-absorbing materials, and new sound-absorbing materials are placed inside the sound-insulating door to ensure the dual functions of sound insulation and low-frequency sound absorption of the door body; a lightweight sound-insulating wall is designed above the sound-insulating door, and the inside of the wall Insert new sound-absorbing materials. Comprehensively considering the sound absorption effect and load-bearing support conditions, the design margin is sufficient to make the wall have sound insulation and low-frequency sound absorption effects; the sound insulation door is fixed by a pre-embedded structure; a 2.0m high support steel is placed in the sound insulation door frame The beam, together with the pre-embedded structure, supports the light-weight sound insulation wall above, ensuring the safe and reliable use of the overall structure.

(3) Ventilation, heat dissipation and noise reduction of the main transformer room:

The comprehensive design of the flow field, thermal effect and noise control of the main transformer room is an important prerequisite to ensure the safe, stable and low-noise operation of the substation equipment. In the case of high ambient temperature and humidity and heavy equipment load, the main transformer usually generates a lot of heat. Considering that the heat sink of the main transformer is arranged outdoors, only part of the heat is discharged indoors, so corresponding ventilation can be carried out thermal design. Therefore, it is necessary to comprehensively consider the requirements of ventilation, heat dissipation and noise control. On the one hand, the air flow field in the main transformer room should be reasonably designed to ensure the safe operation of the substation equipment under extreme working conditions and environmental conditions; The noise control design is carried out in the ventilation and heat dissipation link of the transformer room to ensure the precise matching between this link and other links, and to ensure the overall noise reduction effect of the substation.

At present, the ventilation structure of the main transformer room is mainly as follows: 4 ventilation openings of 1.5m×0.9m are arranged on the single side wall of each room, and there is 1 ventilation opening with a diameter of 0.5m above the south side of the main transformer room.

According to the relevant data of analogy station B and the indoor and outdoor temperature difference of the main transformer of station A, transformer performance, interior design structure and other parameters, the indoor air flow field is first calculated, and the flow field distribution, flow path, flow direction, flow velocity, and cyclone are calculated. Distribution and other parameters were analyzed. The flow field distribution of the ventilation window section of the main transformer room is not on the same section as the exhaust outlet. A comprehensive analysis of the air inlet and exhaust of the main transformer room has been carried out during the simulation calculation.

After design and demonstration, the indoor air flow field can achieve a more reasonable distribution feature by setting the fan and exhaust noise reduction system above the main transformer and the ventilation noise reduction system below, which can achieve the goal of effective heat dissipation for the substation equipment. At the same time, the location layout of the cooling fan is compared and analyzed. Considering the directivity of the heat flow of the indoor air, the upper ventilation opening in the room is selected as the best layout location of the cooling fan. Fan air volume and full pressure parameters are calculated based on temperature rise, environment, and indoor and outdoor structural parameters. One axial flow fan with an air volume of 6000m ³ /h and a full pressure of 100Pa can fully meet the ventilation and heat dissipation in the main transformer room.

Under the premise of ensuring ventilation and heat dissipation, the noise control measures of the air intake and exhaust outlets are specially designed for the characteristics of indoor ventilation and heat dissipation, mainly used to block the exchange of sound energy between indoor power transformation equipment and outdoor. Among them, 4 low-noise fans are used for the top air intake and exhaust system of the main transformer room, 5 fans are used for the cable interlayer air intake and exhaust system, and 4 low-noise fans are used for the air intake and exhaust system of the switch room. In addition, in order to ensure the noise control of the exhaust system, a large number of noise-absorbing static pressure boxes, mufflers, and noise-absorbing elbows are used for each air intake and exhaust system.

(4) Relevant design for the inspection, maintenance and overhaul of the main transformer room:

This noise reduction design has fully considered the relevant conditions of the main transformer inspection, maintenance and overhaul, and reserved corresponding space.

For the daily inspection of the main transformer room, this design retains the original personnel access, and the thickness of the sound-absorbing wall on the indoor wall does not exceed 0.16m, which does not occupy the work space of the inspection personnel and will not affect the normal inspection work.

For the daily maintenance of the main transformer room, according to the relevant consultation with the entrusting unit, the components for maintenance can enter and exit through the sound insulation door; if necessary, the sound-absorbing wall can be quickly disassembled, and all designs can meet the maintenance needs.

For the overhaul of the main transformer room, the mufflers and sound-absorbing walls on the relevant walls are designed to be detachable to facilitate disassembly and installation during overhaul and ensure the smooth progress of normal work.

5. Implementation effect of noise reduction project:

According to the actual test results of the noise reduction measures after the substation is put into operation, the noise reduction effects of each noise reduction measure can be obtained as shown in Table 1.

Table 1 List of measured noise reduction effects of substation noise reduction measures

serial number Name of Noise Reduction Measures Amount of noise reduction used in the field 1 roof exhaust muffler 14.3dB 2 Roof Low Noise Fan Air exhaust noise 57.9dB(A) 3 Sound-absorbing wall of main transformer room 8.1dB (low frequency 10.8dB) 4 Sound insulation door of main transformer room 17.2dB 5 Ventilation and silencer static pressure box of main transformer room 20.1dB 6 Switch room fan muffler 20.9dB 7 Underground pipe muffler 30.5dB

When measuring the noise at the station boundary, due to the limitation of working conditions and conditions, the measuring points are mainly set at the station boundary on the south side of the substation, as shown in Figure 4. Figure 5 shows the spectrum characteristics of each measuring point in the station boundary.

It can be seen from the frequency spectrum of the station boundary that the emission noise level at the station boundary is about 43.61dB(A), fully meeting the emission limit requirements of GB12348 Class I acoustic environment functional area.

Figure 6 shows the spectrum characteristics of environmental background noise. It can be calculated from the figure that the environmental background noise of the substation is about 43.37dB(A), which is less different from the emission noise at the station boundary, indicating that the external interference is small and the measurement data is valid.

After the technical scheme of the present invention is applied and the construction is completed, the noise at the station boundary is measured to be 43.61dB(A), which meets the standard of Class I acoustic environment functional area. The method adheres to the concept of green environmental protection, adopts new materials, new technologies, and new processes to carry out noise reduction design for new substations, effectively controls the noise emission at the station boundary, and provides a basis for the design of similar substations under the situation of increasingly stringent environmental protection requirements. refer to.

It is understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy described.

In the foregoing Detailed Description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, the invention lies in less than all features of a single disclosed embodiment. Thus the following claims are hereby expressly incorporated into the Detailed Description, with each claim standing on its own as a separate preferred embodiment of this invention.

The foregoing description includes illustrations of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods to describe the above-mentioned embodiments, but those skilled in the art should recognize that various embodiments can be further combined and permuted. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "comprises" is used in the specification or claims, the word is encompassed in a manner similar to the term "comprises" as interpreted when "comprises" is used as a link in the claims.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still modify or equivalently replace the specific embodiments of the present invention. , any modifications or equivalent replacements that do not deviate from the spirit and scope of the present invention are within the protection scope of the claims of the present invention pending application.

Claims (8)

1. transformer station's noise-reduction method, is a kind of noise-reduction method using the plan of newly-built transformer station, it is characterised in that described Method comprises the steps:

(1) reference station is selected, it was predicted that the noise spectrum feature of described transformer station and propagation effect rule；

(2) noise reduction sound-absorbing material and the type selecting of device and Application Design；

(3) comprehensive Noise Reduction scheme based on finite element analysis is determined.

2. noise-reduction method as claimed in claim 1, it is characterised in that in described step (1), execute according to described transformer station The buider's work drawing of work and the equipment list of plan buying, grasp transformer station's main sound source equipment and topology layout, investigate equipment Brand Type Number and manufacturer's information；Reselection and the reference station of described substation structure layout same approach, use sound meter field survey Analyze sound source device near field in this reference station, far-field noise and the station circle noise at reference station, and draw the Noise map at reference station, As spectral characteristics of noise and the analysis foundation of propagation effect rule of described transformer station, to predict the noise spectrum of described transformer station Feature and propagation effect rule；

The spectrogram of in using sound meter measurement to obtain reference station and station circle noise, determines the distribution frequency range of sound energy.

3. noise-reduction method as claimed in claim 2, it is characterised in that according to the Noise map at reference station, analysis can be effective Carry out noise control key node, including noise source, noise transmission approach and sensitive point for noise, observe main transformer and cold But the far and near field noise sound level of system, the door and window of transformer chamber, enters at air exhaust passage mouth and noise in the range of the circle periphery 50m of station Sound level and propagation attenuation feature.

4. noise-reduction method as claimed in claim 1, it is characterised in that in described step (2), make an uproar according to described transformer station Sound feature carries out noise reduction sound-absorbing material, the type selecting of construction and device and Application Design；The sound absorption crest of described noise reduction sound-absorbing material is bent Line cover sound energy distribution frequency range, its construction and device meet do not affect station in electrical equipment properly functioning on the premise of, It is arranged on the requirement at key node.

5. noise-reduction method as claimed in claim 4, it is characterised in that described noise reduction sound-absorbing material uses framework sound absorption wall shape Formula, by the double resonance low frequency composite sound-absorbing material of microperforated panel with aluminum fiberboard composition, is laid in wall position, transformer station indoor, Described noise reduction sound-absorbing material is when the low frequency absorption of 100Hz, and described noise reduction sound-absorbing material has the acoustic absorptivity of more than 0.3； Described noise reduction sound-absorbing material, when the high frequency sound absorption of 100～1600Hz, is not less than the sound-absorbing material of 0.6 for having acoustic absorptivity.

6. the noise-reduction method as described in claim 4 or 5, it is characterised in that described noise reduction sound-absorbing material is that micropore-fiber is multiple Close sound-absorbing material, and be processed into sound absorption wall, sound absorption door and muffler.

7. noise-reduction method as claimed in claim 1, it is characterised in that in described step (3), described sound absorption-insulate against sound-disappear The noise control comprehensive Design scheme of sound includes: described transformer station inner cable interlayer enters the installation of air exhausting soundproofing system；Main transformer The installation of ceiling portion air exhausting soundproofing system；Main transformer indoor sound absorption wall and the installation of sound-attenuating system and main transformer room soundproof door Installation.

8. noise-reduction method as claimed in claim 7, it is characterised in that described transformer station inner cable interlayer enters air exhausting soundproofing system Installation include: enter air exhaust passage at substation cable interlayer and Soundproofing static pressure box, bend muffler and 1～6 silent ventilator be installed, Fan noise is less than 60dB；

The installation of described main transformer room top air exhausting soundproofing system includes: each main transformer room lateral wall wall cloth puts 3～6 Vent, each main transformer room roof all has the vent of 1～3 diameter 0.5m；And Soundproofing static pressure box, noise elimination are installed Device and 1～6 silent ventilator, fan noise is less than 60dB；

The installation of described main transformer indoor sound absorption wall and sound-attenuating system includes: noise reduction sound-absorbing material is with the shape of framework sound absorption wall Formula is laid in main transformer room internal face position；Main transformer room enter in air exhaust passage install Soundproofing static pressure box, acoustic filter, Bend muffler and 2～6 silent ventilators, fan noise is less than 60dB；

The installation of described transformer room soundproof door includes: install opposite opened soundproof door, every main transformer room at original big outer side of door Design soundproof door 1～3；Soundproof door door body is combined with noise reduction sound-absorbing material, inserts noise reduction sound-absorbing material inside soundproof door, To ensure sound insulation and the low frequency absorption dual function of soundproof door door body；Light sound-proof wall, side in body of wall is designed above soundproof door Enter noise reduction sound-absorbing material；Set acoustically effective and carrying support situation design margin, so that body of wall has sound insulation and low frequency absorption is imitated Really；Soundproof door uses pre-buried structure mode to fix；Dispose into support steel beam at sound insulation doorframe, jointly support top with pre-buried structure Light sound-proof wall, it is ensured that integrally-built safe and reliable use.