CN110762156A - Pretension damping suspension vibration damper for converter valve tower - Google Patents
Pretension damping suspension vibration damper for converter valve tower Download PDFInfo
- Publication number
- CN110762156A CN110762156A CN201910859710.2A CN201910859710A CN110762156A CN 110762156 A CN110762156 A CN 110762156A CN 201910859710 A CN201910859710 A CN 201910859710A CN 110762156 A CN110762156 A CN 110762156A
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- Prior art keywords
- converter valve
- valve tower
- suspension
- insulator
- damper
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/005—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a wound spring and a damper, e.g. a friction damper
- F16F13/007—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a wound spring and a damper, e.g. a friction damper the damper being a fluid damper
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a pre-tension damping suspension vibration damper for a converter valve tower, which comprises a suspension insulator, a tension insulator and a spring damper, wherein the suspension insulator is arranged on the tension insulator; the top of the converter valve tower is obliquely suspended on a valve hall steel roof truss through a plurality of suspension insulators, and the resultant force center of the suspension insulators is superposed with the center of the converter valve tower; the bottom of the converter valve tower is connected with the ground through a plurality of tensioning insulators, and the resultant force center of the plurality of tensioning insulators is superposed with the center of the converter valve tower; the suspension part of the suspension insulator is provided with the spring damper, and the pull-joint part of the tensioning insulator is provided with the spring damper. The device has simple structure and easy installation, can effectively control the vibration of the converter valve tower under the action of earthquake, does not influence the normal electrical function of equipment, has small occupied area and does not influence the passing of maintenance vehicles below; the method is particularly suitable for the ultrahigh voltage converter valve tower in a high seismic intensity region.
Description
Technical Field
The invention relates to the technical field of converter equipment, in particular to a pre-tension damping suspension vibration damper which is used for an extra-high voltage converter valve tower and can effectively reduce the vibration acceleration and the horizontal displacement of the valve tower under an earthquake.
Background
The electric power system is an important component of a large complex lifeline system, and once the electric power system is damaged in an intense earthquake, the whole society can be directly paralyzed. The power equipment suffers from serious damage in the earthquakes over the years, the earthquake-resistant performance of the power equipment is directly related to the safe operation of a power system, and important research is needed. On one hand, the converter valve tower is one of the most important devices of the high-voltage direct-current transmission system, and the anti-seismic performance of the converter valve determines whether the transmission system can run safely and reliably under the action of an earthquake; on the other hand, the converter valve tower is expensive, and generally, the price of the converter valve accounts for 1/4 of the total price of the whole set of equipment of the transformer substation; in conclusion, the safe operation of the converter valve tower is very critical in the earthquake, and the earthquake-proof performance of the converter valve tower needs to be focused!
The converter valve tower is generally installed by adopting a suspension structure, and is suspended on a steel roof truss of a steel structure valve house by adopting a suspension insulator. The structural form has the advantages that the stress response of the valve tower under the earthquake is greatly reduced, and the structural form has the defects that the valve tower has low horizontal rigidity, seismic wave low-frequency components can cause large horizontal displacement to the valve tower, and the seismic wave low-frequency components are high, so that the horizontal displacement of the valve tower can even exceed 1 m. The connection between other equipment and the valve tower in the valve yard is damaged due to the large horizontal displacement, in addition, the internal structure of the valve tower is complex, the insulation requirement is high, and the large horizontal displacement can cause the internal short circuit of the valve tower, thereby endangering the operation of the whole transformer substation and even the whole line. At present, accurate earthquake prediction cannot be achieved, the converter valve tower cannot be stopped before an earthquake, and therefore the problem of horizontal displacement control of the suspended converter valve tower must be concerned.
Specifications although the horizontal displacement control scheme of other suspension devices than converter valves, i.e. the suspension devices are tied to the ground, is given, for converter valve towers, the specifications do not give a clear and effective control scheme.
Similarly, if the method of pulling the suspension device to the ground is applied to the converter valve tower, the feasibility is that the lower shielding cover of the converter valve tower of some types does not completely shield the converter valve tower framework, and the tension insulator connected with the ground can bypass the shielding cover and be directly connected with the converter valve tower framework; after the converter valve tower is pulled to the ground, the problem of stray capacitance possibly generated by the converter valve tower can be solved by the prior art.
However, it is not feasible to tie the converter valve tower directly to the ground. On one hand, if the suspension insulator and the tensioning insulator are both in a vertical connection mode, the insulator and the converter valve tower form a geometric transient system, and huge tension can be generated in the insulator to cause damage; on the other hand, before horizontal displacement is controlled by pulling with the ground, the fundamental frequency of the converter valve tower and the fundamental frequency of the valve stack are greatly different, the two cannot generate resonance, if the converter valve tower is directly connected with the ground without adopting a damper, the fundamental frequency of the converter valve tower must be increased to be close to the fundamental frequency of the valve stack, the connection rigidity reaches a certain degree, and the two can generate resonance.
In conclusion, the horizontal displacement of the converter valve tower can be limited by being tied to the ground, and the earthquake influence is reduced, but the converter valve tower cannot be directly tied to the ground simply.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a pre-tension damping suspension vibration damper for a converter valve tower.
The invention is realized by the following technical scheme: a pre-tension damping suspension vibration damper for a converter valve tower comprises a suspension insulator, a tension insulator and a spring damper; the top of the converter valve tower is obliquely suspended on a valve hall steel roof truss through a plurality of suspension insulators, and the resultant force center of the suspension insulators is superposed with the center of the converter valve tower; the bottom of the converter valve tower is connected with the ground through a plurality of tensioning insulators, and the resultant force center of the plurality of tensioning insulators is superposed with the center of the converter valve tower; the suspension part of the suspension insulator is provided with the spring damper, and the pull-joint part of the tensioning insulator is provided with the spring damper.
The spring damper has pretension, and the obliquely arranged suspension insulator with the pretension limits the horizontal displacement of the converter valve tower under the earthquake; the tension insulator with pretension force below the converter valve tower limits the converter valve tower to swing; meanwhile, the existence of the pretension force prevents the tension insulator from buckling under pressure; the spring damper reduces the acceleration of the converter valve tower under the earthquake, and avoids the vertical elastic rebound phenomenon; the horizontal component of the pulling force in the insulator is distributed by adjusting the oblique inclination angle of the suspension insulator, so that the structure of the valve tower in different areas is adapted.
The spring damper is connected with the suspension insulator in a bidirectional hinge mode; the spring damper is connected with the tensioning insulator in a bidirectional hinged mode. The joint of the spring damper can swing freely around the suspension insulator and the tension insulator by the bidirectional hinge.
The spring damper comprises an upper bidirectional hinge joint, an upper connecting plate, a hydraulic damper, a tensioning spring, a lower connecting plate, a turnbuckle and a lower bidirectional hinge joint; the upper connecting plate is hinged to the upper bidirectional hinged node, and two ends of the hydraulic damper are respectively connected with the upper connecting plate and the lower connecting plate; the tensioning springs are provided with a plurality of groups, one end of each tensioning spring is fixed on the upper connecting plate, the other end of each tensioning spring is fixed on the lower connecting plate, and the resultant force center of the plurality of tensioning springs is superposed with the resultant force center of the hydraulic damper; one end of the turn buckle is connected to the lower connecting plate, and the other end of the turn buckle is hinged to the lower bidirectional hinged node. A tension spring providing a pretension; the mounting height can be finely adjusted through the turn buckle, so that the tension of each insulator is uniformly distributed, and the pretension can be adjusted.
The ground is provided with a ground support; the ground support comprises a reinforced concrete base and an embedded connecting piece arranged on the reinforced concrete base; and the lower bidirectional hinged node is hinged on the embedded connecting piece.
The two suspension insulators are respectively connected to two ends of the top of the converter valve tower; and the two suspension insulators are respectively connected to two ends of the bottom of the converter valve tower.
Compared with the prior art, the invention has the advantages that: the device can effectively control the vibration of the converter valve tower under the action of an earthquake, and has the advantages of simple structure, easy installation, no influence on the normal electrical function of equipment, small occupied area, no influence on the passing of maintenance vehicles below and good limiting effect; the method is particularly suitable for the extra-high voltage converter valve tower in a high earthquake intensity area, and the horizontal displacement and vertical acceleration response of the converter valve are effectively limited, so that expensive electrical equipment is protected.
Drawings
FIG. 1 is a schematic illustration of an installation of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a spring damper according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a ground support according to an embodiment of the present invention.
The reference numerals in the drawings mean: 1. a converter valve tower; 2. suspending an insulator; 3. tensioning the insulator; 4. a spring damper; 5. a ground support; 6. the diagonal drawing angle; 7. valve hall steel roof trusses; 8. an upper bidirectional hinged node; 9. an upper connecting plate; 10. a hydraulic damper; 11. tensioning the spring; 12. a lower connecting plate; 13. a turn buckle; 14. a lower bidirectional hinged node; 15. pre-burying a connecting piece; 16. a reinforced concrete base.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Examples
Referring to fig. 1 to 3, a pretension damping suspension vibration damping device for a converter valve tower 1 includes a suspension insulator 2, a tension insulator 3, and a spring damper 4; the top of the converter valve tower 1 is obliquely suspended on a valve hall steel roof truss 7 through a plurality of suspension insulators 2, and the resultant force center of the plurality of suspension insulators 2 is superposed with the center of the converter valve tower 1; the bottom of the converter valve tower 1 is connected with the ground through a plurality of tensioning insulators 3, and the resultant force center of the plurality of tensioning insulators 3 is superposed with the center of the converter valve tower 1; the suspension part of the suspension insulator 2 is provided with a spring damper 4, and the pull part of the tension insulator 3 is provided with the spring damper 4.
The spring damper 4 has pretension, and the obliquely arranged suspension insulator 2 with the pretension limits the horizontal displacement of the converter valve tower 1 under the earthquake; the tension insulator 3 with pretension force below the converter valve tower 1 limits the converter valve tower 1 to swing; meanwhile, the existence of the pretension force prevents the tension insulator 3 from buckling under the stress; the spring damper 4 reduces the acceleration of the converter valve tower 1 under the earthquake, and avoids the phenomenon of elastic rebound in the vertical direction; the horizontal component of the pulling force in the insulator is distributed by adjusting the inclined inclination angle of the suspension insulator 2, so that the structure of the valve tower in different areas is adapted.
The spring damper 4 is connected with the suspension insulator 2 in a bidirectional hinge manner; the spring damper 4 is connected with the tensioning insulator 3 in a bidirectional hinged mode. The joint of the spring damper 4 can swing freely around the suspension insulator 2 and the tension insulator 3 by the bidirectional hinge.
The spring damper 4 comprises an upper bidirectional hinge joint 8, an upper connecting plate 9, a hydraulic damper 10, a tension spring 11, a lower connecting plate 12, a turn buckle 13 and a lower bidirectional hinge joint 14; the upper connecting plate 9 is hinged on the upper bidirectional hinged node 8, and two ends of the hydraulic damper 10 are respectively connected with the upper connecting plate 9 and the lower connecting plate 12; a plurality of tensioning springs 11 are arranged, one end of each tensioning spring 11 is fixed on the upper connecting plate 9, the other end of each tensioning spring 11 is fixed on the lower connecting plate 12, and the resultant force center of the plurality of tensioning springs 11 is superposed with the resultant force center of the hydraulic damper 10; one end of the turn buckle 13 is connected to the lower connecting plate 12, and the other end is hinged to the lower bidirectional hinge joint 14. A tension spring 11 providing a pretension; the mounting height can be finely adjusted through the turn buckle 13, so that the tension of each insulator is uniformly distributed, and the pretension can be adjusted.
The ground is provided with a ground support 5; the ground support 5 comprises a reinforced concrete base 16 and an embedded connecting piece 15 arranged on the reinforced concrete base 16; the lower bidirectional hinge joint 14 is hinged on the embedded connecting piece 15.
Two suspension insulators 2 are arranged and respectively connected to two ends of the top of the converter valve tower 1; two suspension insulators 2 are arranged and are respectively connected to two ends of the bottom of the converter valve tower 1.
The following two factors are mainly used for influencing the safety of the valve tower structure under the action of an earthquake: 1, after the earthquake action is amplified by a valve house, forcing a converter valve tower 1 suspended on a valve house steel roof truss to generate huge horizontal displacement; 2, a vertical earthquake acts on the valve tower structure, the valve tower structure may generate a weightlessness phenomenon, and at the moment, the rope for hanging the valve tower and the valve tower generate an elastic rebound phenomenon.
The number and specifications of the tension springs 11 of the spring damper 4 of the present embodiment are selected according to the stiffness requirements of the actual engineering, and the tension springs 11 are symmetrically arranged around the damper. The damper of the spring damper 4 is a hydraulic damper 10 product, key parameters such as damping coefficient, nonlinear index and maximum stroke of the damper are obtained through actual condition calculation, and the specification of the damper is selected according to the key parameters. The hydraulic damper 10 and the tension spring 11 can be connected with the upper connecting plate 9 and the lower connecting plate 12 through welding or mechanical means. In this embodiment, the "spring damper 4" is formed by two tension springs 11 and one hydraulic damper 10 placed in parallel, and may be called a "spring-damper node" instead of a spring damper.
The top of the converter valve tower 1 is suspended on a valve hall steel roof truss 7 in an inclined manner according to an inclined pulling angle 6 through a suspension insulator 2; the suspension insulator 2 is hinged with the valve hall steel roof truss 7 in a bidirectional mode, and the upper end portion of the suspension insulator is provided with a spring damper 4; the bottom of the converter valve tower 1 is tied with the ground through a tension insulator 3, a reinforced concrete support is arranged on the ground, and the tension insulator 3 is hinged with the reinforced concrete support in a bidirectional mode; the end part of one end of the tension insulator 3 is also provided with a spring damper 4.
The lengths of the suspension insulator 2 and the tension insulator 3 are determined according to the insulation requirements of the electrical equipment, and the diagonal pulling angle 6 is determined by comprehensively considering the horizontal displacement control effect and the arrangement condition in the converter valve hall. The maximum allowable tensile stress of the suspension insulator 2 and the tension insulator 3 is determined according to the mechanical strength of the valve house steel roof truss and the converter valve tower 1.
The key technical parameters of the device are a diagonal pulling angle 6, a pre-tension, a damper damping coefficient and spring stiffness; the value of the diagonal pulling angle 6 is to comprehensively consider the horizontal displacement control effect and the arrangement condition in a converter valve hall; the damping coefficient of the damper is valued according to displacement limit; the pretension takes values according to the damping force; the spring stiffness is taken according to the pretension requirement and the displacement limit; firstly, determining the inclined pulling distance according to the arrangement in a valve hall, then calculating the damping coefficient of a damper according to the displacement limit requirement, calculating the required pretension according to the damping force, and finally calculating the rigidity required by a spring
Establishing a converter valve hall-valve tower theoretical analysis model, adjusting the rigidity of a tension spring 11 in a spring damper 4, the damping coefficient of a hydraulic damper 10 and the pretension of a tension insulator 3, respectively inputting unidirectional seismic waves for calculation according to different parameter combinations, and obtaining the horizontal displacement of the tension insulator under unidirectional seismic motion and the tension of a suspension insulator 2. And selecting the parameter combination which has the minimum displacement in the result and meets the strength requirement and the installation requirement of each component.
During installation, the reinforced concrete base 16 is poured on the ground of the valve hall, and the strength of the steel bars in the base is enough to resist the pretension. Firstly, connecting a suspension insulator 2 with a valve hall steel roof truss 7 through a spring damper 4 on site, and suspending a converter valve tower 1 on the suspension insulator 2; then, connecting the tension insulator 3 with the spring damper 4, and connecting the tension insulator 3 with the converter valve tower 1; thereafter, a pretension is applied to the lower connecting plate 12 of the spring damper 4; after the pretension is applied, the length of the turn buckle 13 is adjusted to ensure that the lower bidirectional hinged node 14 is reliably connected with the embedded connecting piece 15, and then the pretension is released; finally, the pretension in the insulators is finely adjusted by adjusting the turnbuckles 13, so that the tensions in the insulators are balanced. It should be noted that the application rate needs to be controlled during the application of the pretension, and the pretension is applied simultaneously to the tension insulators 3, and the maintenance of the diagonal tension angle 6 during the application of the pretension is noted.
The device adopts an oblique suspension insulator 2 which forms a certain angle with the horizontal plane, the bottom of a converter valve tower 1 is vertically connected with the ground through a tensioning insulator 3, a spring damper 4 is arranged at the joint of the insulator, the ground and a valve house to apply pretension, and the horizontal displacement and the elastic rebound of the valve tower are limited through the method. The spring damper 4 is a key structure, pretension is applied through the tension spring 11, the pretension limits horizontal displacement and prevents the tension insulator 3 from buckling under pressure, and the hydraulic damper 10 limits elastic rebound of the converter valve tower 1 and reduces earthquake acceleration of the structure of the converter valve tower 1. For different valve tower structures of the valve house, the best damping effect can be achieved by adjusting the inclination angle of the insulator, the rigidity of the spring, the damping coefficient of the damper and the pre-tension.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A pretension damping suspension vibration damper for converter valve tower is characterized in that: comprises a suspension insulator (2), a tension insulator (3) and a spring damper (4); the top of the converter valve tower (1) is obliquely suspended on a valve hall steel roof truss (7) through a plurality of suspension insulators (2), and the resultant force center of the suspension insulators (2) is superposed with the center of the converter valve tower (1); the tension insulator is connected with the ground through a plurality of tension insulators (3) at the bottom of the converter valve tower (1), and the resultant force center of the tension insulators (3) is superposed with the center of the converter valve tower (1); the suspension insulator (2) is provided with the spring damper (4), and the tensioning insulator (3) is provided with the spring damper (4).
2. The pre-tension damped suspension damper assembly for a converter valve tower of claim 1, wherein: the spring damper (4) is connected with the suspension insulator (2) in a bidirectional hinged mode; the spring damper (4) is connected with the tensioning insulator (3) in a bidirectional hinged mode.
3. The pre-tension damped suspension damper assembly for a converter valve tower of claim 2, wherein: the spring damper (4) comprises an upper bidirectional hinge joint (8), an upper connecting plate (9), a hydraulic damper (10), a tensioning spring (11), a lower connecting plate (12), a turn buckle (13) and a lower bidirectional hinge joint (14); the upper connecting plate (9) is hinged to the upper bidirectional hinged node (8), and two ends of the hydraulic damper (10) are respectively connected with the upper connecting plate (9) and the lower connecting plate (12); the tensioning springs (11) are provided with a plurality of tensioning springs, one end of each tensioning spring (11) is fixed on the upper connecting plate (9), the other end of each tensioning spring is fixed on the lower connecting plate (12), and the resultant force centers of the tensioning springs (11) are superposed with the resultant force center of the hydraulic damper (10); one end of the turn buckle (13) is connected to the lower connecting plate (12), and the other end of the turn buckle is hinged to the lower bidirectional hinged node (14).
4. The pre-tension damped suspension damper assembly for a converter valve tower of claim 3, wherein: the ground is provided with a ground support (5); the ground support (5) comprises a reinforced concrete base (16) and a pre-embedded connecting piece (15) arranged on the reinforced concrete base (16); and the lower bidirectional hinged node (14) is hinged on the embedded connecting piece (15).
5. The pre-tension damped suspension damper assembly for a converter valve tower of claim 1, wherein: the two suspension insulators (2) are respectively connected to two ends of the top of the converter valve tower (1); and the two suspension insulators (2) are respectively connected to two ends of the bottom of the converter valve tower (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910859710.2A CN110762156A (en) | 2019-09-11 | 2019-09-11 | Pretension damping suspension vibration damper for converter valve tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910859710.2A CN110762156A (en) | 2019-09-11 | 2019-09-11 | Pretension damping suspension vibration damper for converter valve tower |
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| Publication Number | Publication Date |
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| CN110762156A true CN110762156A (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910859710.2A Pending CN110762156A (en) | 2019-09-11 | 2019-09-11 | Pretension damping suspension vibration damper for converter valve tower |
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| CN (1) | CN110762156A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439344A (en) * | 2020-04-21 | 2020-07-24 | 西安西电电力***有限公司 | Converter valve fixing method based on marine transportation and converter valve transportation system |
| CN112031192A (en) * | 2020-08-06 | 2020-12-04 | 大连理工大学 | Land supports formula converter valve tower damping device |
| CN115832901A (en) * | 2022-12-02 | 2023-03-21 | 山东华控自动化设备有限公司 | Electric control cabinet with noise reduction function |
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| JPS61221571A (en) * | 1985-03-27 | 1986-10-01 | Toshiba Corp | High tension thyristor valve |
| EP2555358B1 (en) * | 2011-08-05 | 2014-03-26 | Tyco Electronics Simel S.A.S. | Telescopic busbar systems |
| CN106684727A (en) * | 2016-11-29 | 2017-05-17 | 同济大学 | Structure for controlling vibration of converter valve tower |
| CN106786032A (en) * | 2016-11-29 | 2017-05-31 | 同济大学 | A kind of vibration control apparatus for converter valve |
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2019
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| JPS61221571A (en) * | 1985-03-27 | 1986-10-01 | Toshiba Corp | High tension thyristor valve |
| EP2555358B1 (en) * | 2011-08-05 | 2014-03-26 | Tyco Electronics Simel S.A.S. | Telescopic busbar systems |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439344A (en) * | 2020-04-21 | 2020-07-24 | 西安西电电力***有限公司 | Converter valve fixing method based on marine transportation and converter valve transportation system |
| CN112031192A (en) * | 2020-08-06 | 2020-12-04 | 大连理工大学 | Land supports formula converter valve tower damping device |
| CN115832901A (en) * | 2022-12-02 | 2023-03-21 | 山东华控自动化设备有限公司 | Electric control cabinet with noise reduction function |
| CN115832901B (en) * | 2022-12-02 | 2024-03-29 | 山东华控自动化设备有限公司 | Electric control cabinet with noise reduction function |
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