Adjustable sound barrier system for noise reduction of transformer and noise reduction method

Abstract

The invention discloses an adjustable sound barrier system for noise reduction of a transformer and a noise reduction method. The adjustable sound barrier system comprises a sound barrier and an adjustable silencer, and the adjustable silencer comprises a silencing device and an electric shutter; the blades of the electric louver are opened or closed, so that the electric louver has a good sound insulation effect but is not ventilated, or can be ventilated but does not have the sound insulation effect. Through the integrated design of the sheet type silencer and the electric shutter, on the premise that the noise reduction performance is ensured, the length of the silencer is compressed to 0.6-1.2 m from the traditional length of 1.5 m or above, and the occupied area and cost are remarkably reduced; according to the difference between day and night noise limit values and the real-time oil temperature of the transformer, working modes are automatically switched, and accurate control of'preferential daytime heat dissipation and preferential night noise reduction 'is achieved; an existing oil temperature monitoring system of the transformer is used as a data source, additional sensors are not needed, and the structure and wiring are simplified; and multiple alarm logics are set, shutter faults and oil temperature abnormity are found and prompted in time, and equipment and noise safety is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to an intelligent adjustable sound barrier system for transformer noise control and a control method thereof, in particular to an intelligent noise reduction system integrating a motorized louver structure with a panel silencer and dynamically regulating the sound barrier ventilation / sound insulation state based on the transformer oil temperature and the day-night period. BACKGROUND

[0002] In coal-fired power plants and gas-fired power plants, the main transformer is usually arranged between the front end of the main plant and the plant boundary wall, close to the plant boundary or noise sensitive point. The continuous broadband electromagnetic-mechanical noise generated during the operation of the transformer often becomes the main reason for the plant boundary noise exceeding the standard. In order to reduce the noise level at the plant boundary and sensitive points, a fixed sound barrier is generally set between the transformer and the plant boundary in existing projects. The sound barrier is generally composed of cast-in-place reinforced concrete foundation, steel column and beam steel structure, and non-ventilation metal sound absorption and insulation board. In order to improve the coverage range of the sound shadow area and enhance the noise reduction effect, the sound barrier needs to be as high as possible and as close to the transformer as possible.

[0003] However, the above conventional technology has the following contradictions that are difficult to balance:

[0004] Contradiction between heat dissipation and noise reduction: when the fixed non-ventilation barrier is high and close to the transformer, it seriously hinders the air flow around the transformer radiator. In summer, the ambient temperature is high during the day and the load is large, which can easily cause the transformer oil temperature to rise, shorten the insulation life, and even trigger a trip;

[0005] Contradiction between land occupation and cost: in order to consider ventilation, one of the existing methods is to add a panel silencer with a length of more than 1.5m under the sound barrier, which can partially alleviate the heat dissipation problem, but significantly increases the land occupation and material cost, making it difficult to arrange in a situation where the plant site is limited;

[0006] Contradiction between noise reduction effect and time period demand: the daytime plant boundary noise limit is relatively loose, while the nighttime limit is strict (usually 10-15dB(A) lower than daytime). The fixed barrier cannot dynamically adjust the noise reduction according to the time period difference, resulting in excessive noise reduction during the day.

[0007] Therefore, the existing technology has not yet provided a sound barrier solution that is compact in structure, controllable in cost, and can adaptively switch between "high ventilation-low noise reduction" and "low ventilation-high noise reduction" according to the real-time oil temperature of the transformer and the difference in daytime and nighttime noise limits. SUMMARY

[0008] In view of the defects that the existing fixed sound barrier cannot meet the transformer heat dissipation requirement and the day and night differentiated noise reduction requirement, the application provides an adjustable sound barrier system for transformer noise reduction and a noise reduction method, which aims to: in the daytime or when the transformer oil temperature is relatively high, operate in the "ventilation priority" mode to ensure the safety of transformer heat dissipation; at night or when the transformer oil temperature is normal, operate in the "noise reduction priority" mode to ensure that the noise at the factory boundary and sensitive points meets the standard; through structure and control integration, significantly reduce the length and land occupation area of the muffler, and reduce the overall cost; realize automatic monitoring, adaptive control and fault alarm of the system, and reduce manual intervention.

[0009] An adjustable sound barrier system for transformer noise reduction comprises a sound barrier 1, the sound barrier 1 comprises an adjustable muffler 14, the adjustable muffler 14 comprises a muffling device and a motorized louver; by opening or closing the blades of the motorized louver, it can have good sound insulation effect but no ventilation, or can have ventilation but no sound insulation effect.

[0010] Further, an adjustable sound barrier system for transformer noise reduction further comprises a transformer oil temperature transmission system and a control system; the transformer oil temperature transmission system collects data from a transformer oil temperature monitoring system and transmits a transformer oil temperature signal to the control system; the control system determines whether the motorized louver should be opened according to the transformer oil temperature signal provided by the transformer oil temperature transmission system, in combination with the time period and whether the transformer has an abnormal overheating (oil temperature higher than the critical temperature T2) phenomenon; if the motorized louver should be opened, an opening instruction is sent to the motorized louver, otherwise the motorized louver should be closed.

[0011] Further, an adjustable sound barrier system for transformer noise reduction further comprises an alarm system; when the motorized louver is in an open state at night, or the motorized louver is in a closed state in the case of abnormal overheating of the transformer, or the state of the motorized louver is inconsistent with the state required by the control system, the alarm system alarms the duty room.

[0012] Further, the alarm system comprises a louver state sensor, a transmission system, an output system and a warning device.

[0013] Further, the sound barrier 1 comprises a steel structure 11, a civil foundation 12, a barrier plate 13 and an adjustable muffler 14; the steel structure 11 serves to support and fix the barrier plate 13 and the muffler 14; the civil foundation 12 serves to fix the steel structure 11.

[0014] Further, the barrier plate 13 is composed of a plurality of sound absorption and insulation modules 130; the sound absorption and insulation module 130 comprises a surface hole plate 131, sound absorption cotton 132, a skeleton 133 and a back plate 134.

[0015] Further, the sound muffling device is a sheet type muffler arranged at the lower part of the sound barrier 1 and arranged opposite to the transformer.

[0016] Further, the electric louver is arranged outside the sound muffling device, and the electric louver can be opened and closed by electricity and manually.

[0017] Further, the adjustable sound barrier system for noise reduction of a transformer further comprises a grounding system 15, which protects the sound barrier from lightning.

[0018] Further, the control logic diagram when the electric louver is in the closed state is as follows.

[0019]

[0020] Further, the control logic diagram when the electric louver is in the opened state is as follows.

[0021]

[0022] Further, when the electric louver is in the opened state at night, or the electric louver is in the closed state in the case of abnormal overheating of the transformer, or the state of the electric louver is inconsistent with the state required by the control system, the alarm system 4 alarms the on-duty room.

[0023] Beneficial effects:

[0024] Compared with the prior art, the present application has the following advantages:

[0025] Through the integrated design of the sheet type muffler and the electric louver, the length of the muffler is compressed from the traditional 1.5 m or more to 0.6 m to 1.2 m, and the land occupation and cost are significantly reduced under the premise of ensuring the noise reduction performance.

[0026] According to the difference between the noise limit values during the day and at night (10-15 dB(A) lower at night than during the day) and the real-time oil temperature of the transformer, the working mode is automatically switched to realize the precise control of "heat dissipation priority during the day and noise reduction priority at night".

[0027] The existing oil temperature monitoring system of the transformer is used as a data source, and no additional sensors need to be added, so that the structure and wiring are simplified.

[0028] Multiple alarm logics are set to timely find and prompt louver faults and abnormal oil temperatures, and to ensure the safety of the equipment and noise.

[0029] The electric louver is selected from mature commercial components, and has simple and reliable structure and convenient post-maintenance. DETAILED DESCRIPTION

[0030] Figure 1is a real shot of a transformer and conventional sound barrier arrangement of a certain gas power plant;

[0031] Figure 2 is an outside view of an adjustable sound barrier system;

[0032] Figure 3 is an inside view of an adjustable sound barrier system;

[0033] Figure 4 is a barrier plate structure diagram;

[0034] Figure 5 is a diagram of adjustable sound barriers at different angles. DETAILED DESCRIPTION

[0035] To more clearly understand the purpose, technical solutions and technical effects of the present application, the present application will be further described below, but the protection scope of the present application will not be limited to the following examples.

[0036] As shown in Figures 1-5 , an adjustable sound barrier system for transformer noise reduction includes a sound barrier, a transformer oil temperature transmission system, a control system, and an alarm system.

[0037] The sound barrier includes a steel structure 11, a civil foundation 12, a barrier plate 13, an adjustable muffler 14, and a grounding system 15.

[0038] The steel structure 11 includes steel columns 111 and steel beams 112, which are composed of hot-rolled H-shaped steel, angle steel, channel steel, and square tube, etc. The steel structure 11 mainly serves to support and fix the barrier plate 13 and the muffler 14, preventing the sound barrier from collapsing under adverse conditions such as earthquakes and typhoons.

[0039] The civil foundation 12 is a cast-in-place reinforced concrete foundation with anchor bolts on its upper part. The civil foundation 12 mainly serves to fix the steel structure 11, preventing the steel structure from collapsing under adverse conditions such as earthquakes and typhoons.

[0040] The barrier plate 13 is composed of multiple sound absorption and insulation modules 130 installed on the project site. Each sound absorption and insulation module 130 has a size of 80-150mm thick, 0.5m-1m wide, and a length equal to the distance between the steel columns 111 minus 50mm. The sound absorption and insulation module 130 includes a covered hole plate 131, sound-absorbing cotton 132, a framework 133, and a back plate 134. The sound absorption and insulation module 130 mainly serves to absorb and insulate sound, with a noise reduction coefficient NRC≥0.75 and a weighted sound reduction Rw≥30dB.

[0041] The cover hole plate 131 is made of galvanized sheet or aluminum alloy sheet punched with a thickness of 0.7mm-1.0mm and an opening rate of 20%-27%, mainly playing a protective role for the sound-absorbing cotton 132 inside the sound-absorbing and sound-insulating module 130, while also ensuring that sound waves can pass through the holes to enter the inside of the sound-absorbing and sound-insulating module 130 and thus be absorbed.

[0042] The sound-absorbing cotton 132 is centrifugal glass wool with a density of 32kg / m³-48kg / m³ and a thickness approximately equal to that of the sound-absorbing and sound-insulating module 130, filled inside the sound-absorbing and sound-insulating module 130, playing a sound-absorbing role.

[0043] The framework 133 is made of 1.2mm-2.0mm galvanized sheet or aluminum alloy sheet bent into shape, arranged on the four sides and inside of the sound-absorbing and sound-insulating module 130, so that the sound-absorbing and sound-insulating module 130 has good structural strength and will not deform, such as bending or twisting.

[0044] The back plate 134 is made of 1.2mm-2.0mm galvanized sheet or aluminum alloy sheet, mainly playing a sound-insulating role.

[0045] The adjustable silencer 14 includes a silencing device and electric louvers. By opening or closing the blades of the electric louvers, it can achieve good sound insulation effect but no ventilation, or ventilation but no sound insulation effect. When the electric louvers are fully opened, the noise reduction of the adjustable silencer 14 is approximately equal to the noise reduction of the silencing device, and when the electric louvers are fully closed, the noise reduction of the adjustable silencer 14 is higher than the noise reduction of the silencing device and the electric louvers. Taking the noise of a typical transformer as an example (see Table 1), the noise reduction of silencers of different lengths is shown in Table 2.

[0046] Table 1 Octave-band noise data of a typical transformer

[0047]

[0048] Table 2 Noise reduction of silencers of different lengths on transformers

[0049]

[0050] The silencing device is a sheet-type silencer arranged at the lower part of the sound barrier 1 with a height of 1-2m set according to engineering needs and arranged opposite the transformer. The thickness of the sound-absorbing sheet of the sheet-type silencer is 150-180mm, and the sheet spacing is equal to the sheet thickness, so the flow rate of the silencing device is 50%. The length of the silencing device is usually set to 0.6m-1.2m, and the specific length is determined according to the required noise reduction, and the noise reduction is determined according to the need for noise reduction to meet the standard. The longer the length, the greater the noise reduction.

[0051] The electric louver is installed outside the muffler, is a mature product purchased on the market, and increases a manual opening and closing mechanism. The louver blade is made of aluminum alloy and has a thickness of 1.5-2 mm. The electric louver can open and close the louver blade in an electric and manual manner. The opening angle is 0°-90°. When the opening angle is 0°, the louver is completely closed and has no ventilation function, but has good sound insulation performance. According to the thickness of the louver blade, the sound insulation amount can reach 10-15 dB. When the opening angle is 90°, the louver is completely opened and basically has no sound insulation performance, but has the largest flow area. Table 3 shows the noise reduction amount of the electric louver in the opening and closing states.

[0052] Table 3 shows the noise reduction amount of the electric louver in the opening and closing states.

[0053]

[0054] In actual engineering, the noise standard values of the power plant boundary in the daytime (6:00-22:00) and at night (22:00-6:00 of the next day) are different. However, since the operation of the power plant is continuous and stable, the noise discharged in the daytime and at night is the same. Therefore, in order to ensure that the noise discharged by the power plant meets the standard, the more stringent night standard is generally referred to in the noise reduction design. Table 4 shows the requirements of the noise emission limit value of the boundary of industrial enterprises in different sound function areas according to the “Industrial Enterprise Boundary Environmental Noise Emission Standard” GB12348.

[0055] Table 4 shows the noise emission limit value of the boundary of industrial enterprises [unit: dB(A)].

[0056]

[0057] According to the standard value, it can be seen that the noise limit value at night is 10-15 dB(A) lower than that in the daytime. At the same time, since the daytime temperature is higher than the nighttime temperature and the solar radiation is stronger, the temperature of the transformer itself is higher than that at night. In addition, the demand for electricity is high in the summer daytime high-temperature weather conditions, which makes the operating load of the transformer high, further increasing the heat generation of the transformer. Considering the comprehensive influence of temperature, solar radiation, and equipment operating load, the transformer has higher ventilation cooling requirements in the daytime.

[0058] Therefore, from the aspects of the daytime noise limit value and the equipment cooling requirement, the electric louver of the adjustable muffler is opened in the daytime period, and a certain ventilation area is added to the transformer on the sound barrier system to help the transformer ventilate and dissipate heat, which is beneficial to the ventilation and heat dissipation of the transformer and will not cause the daytime noise to exceed the standard.

[0059] At night, the temperature is low, there is no solar radiation, the power load is relatively lower than that in the daytime, the heat generated by the transformer is lower, the cooling requirement of the transformer is lower than that in the daytime, and the noise limit value at night is 10-15dB(A) lower than that in the daytime. At this time, the electric louver can be closed, which does not affect the ventilation and heat dissipation of the transformer, and also meets the noise emission requirement. The noise reduction amount of the combination of the different length mufflers and the electric louver is shown in Table 5.

[0060] Table 5 Noise reduction amount of different length mufflers + electric louver

[0061]

[0062] The grounding system 15 includes a plurality of conductive wires, which are connected in series to form a conductive body, and are connected to the grounding electrode of the transformer area, so as to protect the sound barrier from being damaged by lightning.

[0063] The transformer oil temperature transmission system collects data from the transformer oil temperature monitoring system and transmits the transformer oil temperature signal to the control system. When the oil temperature is higher than the critical temperature T1 (which can be set to 65-70℃) and lower than the critical temperature T2 (which can be set to 75-85℃), it is determined that the transformer is overheated. Since the transformer is provided with an oil temperature monitoring system, the transformer oil temperature transmission system of the present application directly accesses the oil temperature monitoring system of the transformer and obtains the oil temperature signal. The oil temperature monitoring system provided by the transformer not only saves the cost of additional oil temperature monitoring system, but also avoids the problem of technical cooperation with different transformer manufacturers required for adding the monitoring system to the transformer, and simplifies the design work.

[0064] The control system determines whether the electric louver should be opened according to the transformer oil temperature signal provided by the transformer oil temperature transmission system, in combination with the time period (daytime or nighttime) and whether the transformer has an abnormal overheating phenomenon (oil temperature higher than the critical temperature T2). If the electric louver should be opened, the control system sends an opening instruction to the electric louver, otherwise the electric louver should be closed. The calculation logic of the control system is as follows:

[0065] (1) The control logic diagram when the electric louver is in the closed state is as follows:

[0066]

[0067] Note: T1 can be set to a value within the range of 65-70℃, and T2 can be set to a value within the range of 75-85℃.

[0068] (2) The control logic diagram when the electric louver is in the opened state is as follows:

[0069]

[0070] Note: T1 can be set to a certain value in the range of 65-70℃.

[0071] In the control logic of the electric shutter opening state, only when the oil temperature drops to T1-10℃ or below, the protection is triggered, and the electric shutter is required to be closed.

[0072] The alarm system, when the electric shutter is in the open state at night, or the electric shutter is in the closed state when the transformer is abnormally overheated, or the state of the electric shutter is inconsistent with the state required by the control system, the alarm system alarms to the duty room. The alarm system includes shutter state sensor, transmission system, output system, alarm. The calculation logic of the alarm system is as follows:

[0073] (1) Alarm system calculation logic diagram when the electric shutter is in the open state

[0074]

[0075] (2) Alarm system calculation logic diagram when the electric shutter is in the closed state

[0076]

[0077] The shutter state sensor mainly collects whether the electric shutter is in the open or closed state. The state sensor uses an outdoor type against type photoelectric switch, which is purchased from the market, and a set of shutter opening position and closing position are set respectively to determine whether the electric shutter is in the open or closed state.

[0078] The transmission system transmits the shutter state collected by the shutter state sensor to the control system. The control system determines whether the actual state of the shutter is consistent with the state it should be in through analysis, and if it is not consistent, it will transmit the alarm signal to the alarm through the output system, and finally transmit the alarm signal to the duty room personnel through the alarm.

[0079] Example 1:

[0080] In the control system, the critical temperature T1 of the transformer oil temperature overheating is set to 65℃, the critical temperature T2 of abnormal heating is set to 80℃, the total height of the transformer sound barrier is 8m, and the bottom 2m high is set as a sound absorber + electric shutter, and the length of the sound absorber is 0.6m. Under normal circumstances, the electric shutter should be in the closed state, and the noise reduction amount of the sound absorber corresponding to the position at the bottom of the sound barrier is 15.9dB(A).

[0081] Under the combined action of high solar radiation intensity, high ambient temperature and high power plant load, the transformer oil temperature gradually rises to 65°C at 13:20 in the afternoon, the control system sends an opening signal to the electric louver, the electric louver is automatically opened, and the noise reduction amount of the noise absorber at the corresponding position of the bottom of the sound barrier is 7.7 dB(A) at this time.

[0082] With the decrease of the solar radiation intensity and the ambient temperature, the transformer oil temperature gradually decreases, and when the oil temperature decreases to 60°C (oil temperature < T1) at 18:00, the control system does not send a closing signal to the electric louver, and no alarm signal is sent. When the oil temperature further decreases to 54°C (< T1-10°C) at 19:30, the electric louver sends a closing signal, and if the electric louver is normally closed, no alarm signal is sent, and after the electric louver is closed, the noise reduction amount of the noise absorber at the corresponding position of the bottom of the sound barrier is restored to 15.9 dB(A); if the electric louver cannot be normally closed due to mechanical failure or the like, the alarm system sends an alarm signal to the duty room through the warning indicator.

[0083] Example 2:

[0084] The critical temperature setting of the control system, the sound barrier height, the noise absorber height and example 1 are the same. Also at 13:20 in the afternoon, under the combined action of high solar radiation intensity, high ambient temperature and high power plant load, the transformer oil temperature gradually rises to 65°C, the control system sends an opening signal to the electric louver. The electric louver cannot be opened due to mechanical jamming or the like. The alarm system sends an alarm signal to the duty room through the warning indicator, and the duty room immediately sends an operator to close the electric louver through a manual device, and the alarm signal stops.

[0085] Example 3:

[0086] The critical temperature setting of the control system, the sound barrier height, the noise absorber height and example 1 are the same. Also at 13:20 in the afternoon, under the combined action of high solar radiation intensity, high ambient temperature and high power plant load, the transformer oil temperature gradually rises to 65°C, the control system sends an opening signal to the electric louver, and the electric louver is automatically opened.

[0087] At 22:00, the transformer oil temperature is 60°C (T1-10°C < oil temperature < T1), the control system sends a closing signal to the electric louver, and the electric louver is automatically closed at this time, and no alarm signal is sent. Since the louver is closed, the transformer ventilation and heat dissipation become poor, the oil temperature rises, and at 23:30 at night, the oil temperature rises to a maximum of 78°C (less than T2), the control system does not send a louver opening signal, and the alarm system does not send an alarm signal.

[0088] Example 4:

[0089] The critical temperature setting, sound barrier height, muffler height and control system of example 1 are the same. The electric louver is originally in the closed state. At 22:30 at night, due to abnormal operation of the transformer, the transformer oil temperature rises rapidly, and when the temperature rises to 65°C, the control system does not send an opening signal to the electric louver. 30 minutes later, the time is 23:00, the oil temperature rises to 80°C and continues to rise, at this time the control system sends an opening signal to the electric louver, the electric louver automatically opens, at the same time, the alarm system sends an alarm signal to the duty room through the warning indicator. After the transformer appears abnormal overheating phenomenon, the power plant staff takes emergency measures on the transformer and eliminates the fault, the oil temperature drops rapidly, at 2:00 the next morning, the oil temperature drops to 79°C, the control system sends a closing signal to the electric louver, the electric louver normally closes, and the alarm system stops sending an alarm signal.

[0090] Example 5:

[0091] The critical temperature setting, sound barrier height, muffler height and control system of example 1 are the same. The electric louver is originally in the closed state. At 22:30 at night, due to abnormal operation of the transformer, the transformer oil temperature rises rapidly, and when the temperature rises to 65°C, the control system does not send an opening signal to the electric louver. 30 minutes later, the time is 23:00, the oil temperature rises to 80°C and continues to rise, at this time the control system sends an opening signal to the electric louver, the electric louver does not automatically open due to mechanical failure and other reasons, the alarm system sends an alarm signal to the duty room through the warning indicator. The duty room also sends people to take measures on the electric louver and the transformer, at 23:10, the electric louver is manually opened, at this time the oil temperature is still ≥80°C, the alarm system still continues to send an alarm signal. With the power plant staff taking emergency measures on the transformer and eliminating the fault, the oil temperature drops rapidly, at 2:00 the next morning, the oil temperature drops to 79°C, the control system sends a closing signal to the electric louver, the electric louver normally closes, and the alarm system stops sending an alarm signal.

[0092] Example 6:

[0093] The control system critical temperature setting, sound barrier height, muffler height and example 1 are the same. The electric louver is originally in the closed state, at night 22:30, due to abnormal operation of the transformer, the transformer oil temperature rises rapidly, when the temperature rises to 65℃, the control system does not send the opening signal to the electric louver. 10 minutes later, the time is 22:40, the oil temperature rises to 80℃ and continues to rise rapidly, at this time the control system sends the opening signal to the electric louver, the electric louver is automatically opened. At the same time, the alarm system sends an alarm signal to the duty room through the warning indicator. After the transformer appears abnormal overheating phenomenon, the power plant staff takes emergency measures and eliminates the fault, the oil temperature drops rapidly, at 2:00 the next morning, the oil temperature drops to 79℃, the control system sends the closing signal to the electric louver, the electric louver fails to close due to mechanical failure, the alarm signal does not stop. The duty room sends personnel to manually close the louver, the alarm signal stops.

[0094] The above examples are only for specific description of the feasible implementation of the present application, and are not intended to limit the patent protection scope of the present application. Any equivalent implementation or modification without departing from the present application shall be included in the patent scope of the present application.

Claims

1. An adjustable sound barrier system for transformer noise reduction, comprising a sound barrier, characterized by: The sound barrier comprises an adjustable sound absorber, which comprises a sound absorbing device and an electric louver; by opening or closing the blades of the electric louver, it can achieve good sound insulation effect but no ventilation, or can ventilate but has no sound insulation effect.

2. An adjustable sound barrier system for transformer noise reduction as claimed in claim 1, wherein: The adjustable sound barrier system further comprises a transformer oil temperature transmission system and a control system; the transformer oil temperature transmission system collects data from the transformer oil temperature monitoring system and transmits the transformer oil temperature signal to the control system; the control system determines whether the electric louver should be opened according to the transformer oil temperature signal provided by the transformer oil temperature transmission system, combined with the time period and whether the transformer has an abnormal overheating phenomenon; if it should be opened, an opening instruction is sent to the electric louver, otherwise the electric louver should be closed.

3. An adjustable sound barrier system for noise reduction of a transformer according to any of claims 1 or 2, characterized in that: The adjustable sound barrier system further comprises an alarm system 4; when the electric louver is in an open state at night, or the electric louver is in a closed state when the transformer is abnormally overheated, or the state of the electric louver is inconsistent with the state required by the control system, the alarm system alarms the duty room.

4. An adjustable sound barrier system for transformer noise reduction as defined in Claim 1, wherein: The sound barrier comprises a steel structure, a civil foundation, a barrier plate, and an adjustable sound absorber; the steel structure supports and fixes the barrier plate and the sound absorber; the civil foundation fixes the steel structure.

5. An adjustable sound barrier system for transformer noise reduction as claimed in claim 4, wherein: The barrier plate is composed of a plurality of sound absorption and insulation modules; the sound absorption and insulation module comprises a surface hole plate, sound absorption cotton, a skeleton, and a back plate.

6. An adjustable sound barrier system for noise reduction of a transformer according to any one of claims 1 or 5, characterized in that: The sound absorbing device is a sheet type sound absorber, which is arranged at the lower part of the sound barrier and opposite to the transformer.

7. An adjustable sound barrier system for transformer noise reduction as claimed in claim 6, wherein: The electric louver is installed outside the sound absorbing device, and the electric louver can be opened and closed by electricity and manually.

8. An adjustable sound barrier system for transformer noise reduction as defined in claim 1, wherein: The adjustable sound barrier system further comprises a grounding system, which protects the sound barrier from being damaged by lightning.

9. A noise reduction method for an adjustable sound barrier for noise reduction of a transformer according to any of claims 1-8, characterized in that: According to the transformer oil temperature signal, combined with the time period such as daytime or night, and whether the transformer has an abnormal overheating phenomenon, it is determined whether the electric louver should be opened; if it should be opened, an opening instruction is sent to the electric louver, otherwise the electric louver should be closed; when the electric louver is in a closed state, the control logic is as follows: ； When the electric louver is in an open state, the control logic is as follows: 。

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