CN114499233A - Novel double-electrode arrangement structure for anti-corrosion deposition in converter valve - Google Patents

Novel double-electrode arrangement structure for anti-corrosion deposition in converter valve Download PDF

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Publication number
CN114499233A
CN114499233A CN202210080546.7A CN202210080546A CN114499233A CN 114499233 A CN114499233 A CN 114499233A CN 202210080546 A CN202210080546 A CN 202210080546A CN 114499233 A CN114499233 A CN 114499233A
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China
Prior art keywords
voltage
electrode
stainless steel
sharing
sharing electrode
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Pending
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CN202210080546.7A
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Chinese (zh)
Inventor
卢斌先
刘鹏龙
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North China Electric Power University
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North China Electric Power University
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Priority to CN202210080546.7A priority Critical patent/CN114499233A/en
Publication of CN114499233A publication Critical patent/CN114499233A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/56—Cooling; Ventilation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

The invention discloses a novel double-electrode arrangement structure for anti-corrosion deposition in a converter valve, which comprises a first voltage-sharing electrode, a second voltage-sharing electrode, a collecting pipe, a branch pipe, an aluminum alloy radiator, a thyristor assembly and a lead wire, wherein the first voltage-sharing electrode and the second voltage-sharing electrode are arranged on two sides of the collecting pipe together, the branch pipe is connected to the collecting pipe, the aluminum alloy radiator is arranged on the branch pipe, the thyristor assembly is connected to the aluminum alloy radiator, and the lead wire is connected to the first voltage-sharing electrode, the second voltage-sharing electrode and the aluminum alloy radiator. The invention belongs to the technical field of converter valves, and particularly relates to a novel double-electrode arrangement structure for corrosion prevention and deposition in a converter valve, which prevents leakage current from flowing through a radiator, fundamentally solves the problems of electrochemical corrosion and deposition in a cooling system, and ensures the safe operation of a power transmission system.

Description

Novel double-electrode arrangement structure for anti-corrosion deposition in converter valve
Technical Field
The invention belongs to the technical field of converter valves, and particularly relates to a novel double-electrode arrangement structure for corrosion prevention and deposition in a converter valve.
Background
The converter valve is a core device of a high-voltage direct-current transmission system and is formed by serially connecting basic units and valve sections. Taking a plus or minus 500kV converter valve as an example, the through-flow capacity of the converter valve in a running converter station is up to more than 5.5kA, and heat generated by valve loss must be effectively radiated to ensure the normal work of the converter valve. In engineering, a water cooling system is adopted to dissipate heat of key devices in the converter valve, the structure of the water cooling system is divided into a series connection type, a parallel connection type and a series-parallel connection type, and the parallel connection type water cooling system is equipped in most +/-500 kV converter stations due to the advantages of the symmetrical structure and the heat dissipation performance of the parallel connection type cooling system. When the converter valve normally operates, the metal components directly contacted with the cooling water have different high potentials, so that leakage current is inevitably generated in water, and once the leakage current flows through the metal components, a series of problems of electrochemical corrosion deposition and the like are inevitably caused. After the converter valves in the parallel single-valve-section cooling system operate for a long time, the problems of electrochemical corrosion and deposition still exist, so that a series of problems of cooling water path blockage, water leakage, heat dissipation failure and the like are caused, and the whole power transmission system is locked and shut down in severe cases. The existing research shows that the content of alumina in the scale substances deposited on the surface of the voltage-sharing electrode exceeds 96 percent, and all aluminum elements come from an aluminum alloy radiator, which indicates that leakage current still flows through the aluminum alloy radiator under the prior art condition to cause the aluminum alloy radiator to generate electrochemical corrosion, so that scale forming ions containing the aluminum elements enter cooling water, and a deposition reaction occurs on the surface of the voltage-sharing electrode. Research shows that the voltage-sharing electrode is in a needle-shaped design and the conductivity of cooling water is low, so that the electric field distribution near the voltage-sharing electrode is concentrated, the potential distribution in the collecting pipe is different from the ideal potential distribution, the potential difference exists at two ends of each branch pipe, the leakage current in a water channel flows into the branch pipes, and the electrochemical corrosion is generated on the surface of the radiator which is directly contacted with the cooling water.
In summary, the conventional voltage-sharing electrode adopts a single-electrode arrangement scheme, and the voltage-sharing electrode is perpendicular to a plane and is installed at the central position of a collecting pipe corresponding to the branch pipe at the outermost side of the valve section, so that leakage current cannot be completely inhibited from flowing through a radiator.
Disclosure of Invention
In order to solve the problems, the invention provides a novel double-electrode arrangement structure for corrosion prevention and deposition in the converter valve, which prevents leakage current from flowing through a radiator, fundamentally solves the problems of electrochemical corrosion and deposition in a cooling system and ensures the safe operation of a power transmission system.
In order to realize the functions, the technical scheme adopted by the invention is as follows: the utility model provides a novel bipolar electrode arrangement structure for corrosion protection is sedimentary in converter valve, includes voltage-sharing electrode one, voltage-sharing electrode two, collecting pipe, a branch flow pipe, aluminum alloy radiator, thyristor assembly and wire, voltage-sharing electrode one is together installed in the collecting pipe both sides with voltage-sharing electrode two, branch union coupling is in the collecting pipe, aluminum alloy radiator locates on the branch flow pipe, thyristor assembly connects in aluminum alloy radiator, the wire is connected in voltage-sharing electrode one, voltage-sharing electrode two and aluminum alloy radiator.
Preferably, the first voltage-sharing electrode and the second voltage-sharing electrode comprise stainless steel electrodes, stainless steel bases, threads, hexagonal nut structures and annular grooves, the stainless steel electrodes are welded to the stainless steel bases, the threads are arranged on the side, close to the stainless steel electrodes, of the stainless steel bases, the airtightness and stability of the water cooling system during normal operation are enhanced, the hexagonal nut structures are arranged in the middle of the stainless steel bases, convenience in installation is improved, the annular grooves are arranged on the top ends of the stainless steel bases, and round corner processing is conducted on the top ends of the stainless steel bases.
Preferably, the first voltage-sharing electrode is installed perpendicular to the plane direction and located 17.6mm in the X direction of the traditional voltage-sharing electrode, the length of a stainless steel electrode of the first voltage-sharing electrode is equal to the radius of a collecting pipe, the second voltage-sharing electrode is installed parallel to the Y direction of the plane and inserted into a branch pipe orifice at the outermost side of the valve section from the outer side of the collecting pipe, the second voltage-sharing electrode and the branch pipe are on the same straight line, the length of the stainless steel electrode of the second voltage-sharing electrode is equal to the diameter of the collecting pipe, and the positions of the voltage-sharing electrodes installed at two ends of the two collecting pipes of the valve section are symmetrically distributed with the first voltage-sharing electrode and the second voltage-sharing electrode
Preferably, the stainless steel electrode is made of stainless steel, the whole stainless steel electrode is of a solid cylindrical needle-shaped structure, the tip of the electrode is subjected to smooth treatment, so that the tip of the electrode is hemispherical, the distortion of an electric field near the tip of the stainless steel electrode is prevented, the electric field intensity is reduced, and the length is divided into two types: 1. the radius of the stainless steel electrode is 1mm, and the length of the stainless steel electrode is 2.
Preferably, the stainless steel base is made of stainless steel.
The invention adopts the structure to obtain the following beneficial effects: compared with the traditional single-electrode arrangement scheme, the novel double-electrode arrangement structure for anti-corrosion deposition in the converter valve can greatly enhance the action of the voltage-sharing electrode for clamping the potential in water, and compared with the traditional single-electrode arrangement scheme, the novel double-electrode arrangement structure enables the total amount of leakage current flowing through 14 radiators to be reduced by 95.7 percent, the total amount of leakage current to be less than 1 muA, further enables the corrosion speed of the aluminum alloy radiator to be reduced by 95.7 percent, enables the cooling water to hardly contain scale forming ions, further prevents the deposition reaction of other metal components such as the surface of the voltage-sharing electrode and the like, fundamentally solves the problems of electrochemical corrosion and deposition in the cooling system, and ensures the stable and safe operation of a power transmission system; the advantages of corrosion resistance and deposition of the double-electrode arrangement scheme are benefited, the voltage-sharing electrode is made of stainless steel, compared with a traditional platinum electrode, the cost is lower, the tip of the electrode is designed to be hemispherical, the distortion of an electric field around the electrode is prevented, and the voltage-sharing electrode is safer; the mounting position and the direction of the second voltage-sharing electrode are directly vertical to the plane direction and are inserted into the orifice of the branch pipe, so that the structure is more stable and the impact of water flow is more resisted.
Drawings
FIG. 1 is an overall block diagram of a novel dual electrode arrangement for corrosion protection deposition in a converter valve in accordance with the present invention;
fig. 2 is a three-dimensional structural view of a novel two-electrode arrangement for corrosion protection deposition in a converter valve according to the present invention.
Fig. 3 is an overall structure diagram of a first voltage-sharing electrode and a second voltage-sharing electrode of a novel double-electrode arrangement structure for corrosion prevention deposition in a converter valve.
The device comprises a base, a voltage-sharing electrode I, a voltage-sharing electrode II, a bus pipe 2, a current collecting pipe 3, a branch pipe 4, an aluminum alloy radiator 5, a thyristor component 6, a lead 7, a stainless steel electrode 8, a stainless steel base 9, threads 10, a hexagonal nut structure 11 and an annular groove.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-3, the novel dual-electrode arrangement structure for corrosion prevention and deposition in a converter valve provided by the invention comprises a first voltage-sharing electrode 1-1, a second voltage-sharing electrode 1-2, a collecting pipe 2, a branch pipe 3, an aluminum alloy radiator 4, a thyristor assembly 5 and a lead 6, wherein the first voltage-sharing electrode 1-1 and the second voltage-sharing electrode 1-2 are installed on two sides of the collecting pipe 2 together, the branch pipe 3 is connected to the collecting pipe 2, the aluminum alloy radiator 4 is arranged on the branch pipe 3, the thyristor assembly 5 is connected to the aluminum alloy radiator 4, and the lead 6 is connected to the first voltage-sharing electrode 1-1, the second voltage-sharing electrode 1-2 and the aluminum alloy radiator 4.
As shown in fig. 3, the first voltage-sharing electrode 1-1 and the second voltage-sharing electrode 1-2 include a stainless steel electrode 7, a stainless steel base 8, a thread 9, a hexagonal nut structure 10 and an annular groove 11, the stainless steel electrode 7 is welded to the stainless steel base 8, the thread 9 is disposed on the side of the stainless steel base 8 close to the stainless steel electrode 7, the hexagonal nut structure 10 is disposed in the middle of the stainless steel base 8, the annular groove 11 is disposed on the top of the stainless steel base 8, the stainless steel electrode 7 is made of stainless steel, the whole is a solid cylindrical needle-shaped structure, and the stainless steel base 8 is made of stainless steel.
As shown in figure 2, a first voltage-sharing electrode 1-1 is installed perpendicular to the plane direction and located 17.6mm in the X direction of a traditional voltage-sharing electrode, the length of a stainless steel electrode 7 of the voltage-sharing electrode is equal to the radius of a collecting pipe 2, a second voltage-sharing electrode 1-2 is installed parallel to the plane Y direction, the stainless steel electrode is inserted into a pipe orifice of a branch pipe 3 on the outermost side of a valve section from the outer side of the collecting pipe 2, the second voltage-sharing electrode 1-2 and the branch pipe 3 are on the same straight line, the length of the stainless steel electrode 7 is equal to the diameter of the collecting pipe 2, and the voltage-sharing electrodes installed at two ends of the two collecting pipes 2 of the valve section are symmetrically distributed with the first voltage-sharing electrode 1-1 and the second voltage-sharing electrode 1-2.
When the water cooling device is used specifically, two electrodes are arranged on two sides, the design structure can greatly enhance the action of clamping the water potential by the voltage-sharing electrode, compared with the traditional single-electrode arrangement scheme, the total leakage current flowing through 14 radiators is reduced by 95.7%, the total leakage current is less than 1 muA, further the corrosion speed of the aluminum alloy radiator 4 is reduced by 95.7%, scaling ions are hardly contained in cooling water, further the deposition reaction of other metal components such as the surface of the voltage-sharing electrode is prevented, the electrochemical corrosion and deposition problems inside the cooling system are fundamentally solved, the stable and safe operation of the operation of a power transmission system is ensured, the installation position of the voltage-sharing electrode II 1-2 is compared with the pipe orifice of the branch pipe 3 inserted in the direction which is more direct and vertical to the plane direction, the structure is more stable, and the water flow impact is more resistant.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. A novel dual electrode arrangement for corrosion protection deposition in converter valves, characterized by: the aluminum alloy radiator comprises a first voltage-sharing electrode, a second voltage-sharing electrode, a collecting pipe, a branch pipe, an aluminum alloy radiator, a thyristor assembly and a lead, wherein the first voltage-sharing electrode and the second voltage-sharing electrode are installed on two sides of the collecting pipe together, the branch pipe is connected to the collecting pipe, the aluminum alloy radiator is arranged on the branch pipe, the thyristor assembly is connected to the aluminum alloy radiator, and the lead is connected to the first voltage-sharing electrode, the second voltage-sharing electrode and the aluminum alloy radiator.
2. A novel dual electrode arrangement for corrosion protection deposition in converter valves according to claim 1, characterized in that: the first voltage-sharing electrode and the second voltage-sharing electrode comprise stainless steel electrodes, stainless steel bases, threads, hexagonal nut structures and annular grooves, the stainless steel electrodes are connected with the stainless steel bases in a welded mode, the threads are arranged on the side, close to the stainless steel electrodes, of the stainless steel bases, the hexagonal nut structures are arranged in the middle of the stainless steel bases, and the annular grooves are formed in the top ends of the stainless steel bases.
3. A novel dual electrode arrangement for corrosion protection deposition in converter valves according to claim 2, characterized in that: the first voltage-sharing electrode is arranged perpendicular to the plane direction and located 17.6mm away from the X direction of the traditional voltage-sharing electrode, the length of a stainless steel electrode is equal to the radius of a collecting pipe, the second voltage-sharing electrode is arranged parallel to the Y direction of the plane and is inserted into a branch pipe orifice at the outermost side of the valve section from the outer side of the collecting pipe, the second voltage-sharing electrode and the branch pipe are on the same straight line, the length of the stainless steel electrode is equal to the diameter of the collecting pipe, and the voltage-sharing electrode positions arranged at two ends of the two collecting pipes of the valve section are symmetrically distributed with the first voltage-sharing electrode and the second voltage-sharing electrode.
4. A novel dual electrode arrangement for corrosion protection deposition in converter valves according to claim 3, characterized in that: the stainless steel electrode is made of stainless steel materials, and the whole body is of a solid cylindrical needle-shaped structure.
5. The novel dual-electrode arrangement for corrosion protection deposition in converter valves according to claim 4, characterized in that: the stainless steel base is made of stainless steel.
CN202210080546.7A 2022-01-24 2022-01-24 Novel double-electrode arrangement structure for anti-corrosion deposition in converter valve Pending CN114499233A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210080546.7A CN114499233A (en) 2022-01-24 2022-01-24 Novel double-electrode arrangement structure for anti-corrosion deposition in converter valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210080546.7A CN114499233A (en) 2022-01-24 2022-01-24 Novel double-electrode arrangement structure for anti-corrosion deposition in converter valve

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CN114499233A true CN114499233A (en) 2022-05-13

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