CN114142746A - Anti-corrosion voltage-sharing electrode for converter valve - Google Patents
Anti-corrosion voltage-sharing electrode for converter valve Download PDFInfo
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- CN114142746A CN114142746A CN202111544285.1A CN202111544285A CN114142746A CN 114142746 A CN114142746 A CN 114142746A CN 202111544285 A CN202111544285 A CN 202111544285A CN 114142746 A CN114142746 A CN 114142746A
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- stainless steel
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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
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20281—Thermal management, e.g. liquid flow control
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- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention provides an anti-corrosion voltage-sharing electrode for a converter valve, which comprises a stainless steel base, a plastic shell and a stainless steel electrode, wherein the stainless steel base is provided with a plurality of grooves; the stainless steel electrode is of a U-shaped structure, the stainless steel base is of a convex structure, and the bottom end of the stainless steel base is connected with the bottom end of the stainless steel electrode in an inserting manner; the plastic shell is sleeved on the bottom end of the stainless steel electrode and the outer portion of the bottom end of the stainless steel base, and the plastic outer sleeve is further sleeved on the top end of the stainless steel electrode and connected with the inner side of the top end and the bottom end to be not sleeved. The application provides an anticorrosive voltage-sharing electrode for converter valve makes its corruption and the deposition rate that has greatly reduced voltage-sharing electrode because special structural design.
Description
Technical Field
The invention relates to the technical field of voltage-sharing electrodes, in particular to an anti-corrosion voltage-sharing electrode for a converter valve.
Background
The converter valve is the core equipment of the direct current transmission project, and because valve loss exists, heat generated by the valve loss must be effectively radiated to ensure the normal work of the converter valve, and the temperature of the thyristor of the converter valve is generally required to be less than 80 ℃, so that the thyristor is radiated by an aluminum alloy radiator which is cooled by inner cooling water and is in close contact with a crystal tube. In order to avoid the problems of discharge caused by uneven voltage distribution of the inner wall and the outer wall of a main cold water pipeline in a converter valve and leakage current caused by contact of metal equipment in a valve assembly and the water pipeline, voltage-sharing electrodes are arranged on a main inner cold water pipe of a valve tower and a water distribution and collection pipe in the valve assembly so as to realize voltage balance of the inner wall and the outer wall of the main water cooling pipeline and release leakage current, so that the leakage current is transferred from metal of electrical equipment to an inert voltage-sharing electrode, and the corrosion of the electrical equipment is avoided.
However, the operation experience proves that the corrosion and scaling problems are generally existed in the water cooling system of the converter valve. Under the long-time operation of the converter valve, electrochemical corrosion reaction occurs on the surface of the aluminum radiator, meanwhile, due to scouring abrasion caused by the flowing of a cooling medium, aluminum ions enter the circulating water path to flow circularly, although part of the aluminum ions are absorbed by the auxiliary circulating ion exchange device, part of the aluminum ions can flow along with the cooling water and pass through the voltage-sharing electrode, and electrochemical corrosion and deposition occur on the voltage-sharing electrode.
As the year 2012, the direct-current blocking accidents of 12 converter stations of the national grid company occur at 80, wherein 18 single-pole and double-pole blocking accidents caused by the cooling system faults in the converter valves account for 22.5% of the total number of the accidents; in 2019, 10 single-stage locking accidents occur in each direct current project in the south, wherein 2 single-stage locking accidents caused by the faults of the cooling system in the converter valve account for 20% of the total number of the accidents; according to the statistical result of the operation accidents of the converter stations such as Deyang converter stations, Baoyi converter stations, Yimin converter stations, Xingren converter stations and the like, the proportion of the operation accidents of the converter stations caused by the cooling system failure in the converter valve to the total number of the accidents is about 10%; for the faults of the cooling system in the converter valve, the proportion of the faults is more than 70% due to the fact that most of the faults are directly or indirectly caused by the fact that the internal cooling water circuit voltage-sharing electrode adsorbs scales, and the fault of the converter valve in each time is high in maintenance cost and seriously threatens the high-efficiency operation of a direct-current transmission system.
In the prior art, a thin platinum needle electrode 1 is usually fixed on a stainless steel base 2 of a direct current transmission converter valve waterway voltage-sharing electrode, as shown in fig. 1, the voltage-sharing electrode structure has the following disadvantages: 1) because the electric field near the voltage-sharing electrode is more concentrated, aluminum ions in cooling water can be easily captured, a large amount of aluminum ions and products thereof are accumulated on the surface of the electrode in a long time, electrode scaling is finally formed, deposits can even fall off to cause the blockage of a water pipe, and the safety and the reliability of the normal operation of a water cooling system are reduced; 2) the platinum needle falls off at the joint of the stainless steel base and the platinum needle due to corrosion of the stainless steel, and water leakage occurs due to corrosion of the stainless steel base; 3) the water pipe is generally made of plastic, the threads of the stainless steel base are sharp, and when the electrode is installed on the water pipe, the threads of the water pipe are easy to slip, so that the water pipe is damaged. Therefore, the problems of corrosion and deposition of the grading electrode need to be solved to ensure the reliability and safety of the operation of the direct current transmission system.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an anti-corrosion voltage-sharing electrode for a converter valve, which can slow down corrosion and deposition.
In view of the above, the present application provides an anti-corrosion voltage-sharing electrode for a converter valve, comprising a stainless steel base, a plastic shell and a stainless steel electrode;
the stainless steel electrode is of a U-shaped structure, the stainless steel base is of a convex structure, and the bottom end of the stainless steel base is connected with the bottom end of the stainless steel electrode in an inserting manner;
the plastic shell is sleeved on the bottom end of the stainless steel electrode and the outer portion of the bottom end of the stainless steel base, and the plastic outer sleeve is further sleeved on the top end of the stainless steel electrode and connected with the inner side of the top end and the bottom end to be not sleeved.
Preferably, the stainless steel base is provided with a threaded hole near the stainless steel electrode end, and the stainless steel electrode is fixed through a bolt.
Preferably, the plastic shell is further provided with a round hole corresponding to the threaded hole, and the diameter of the round hole is larger than the diameter of the threaded hole by 1-2 mm.
Preferably, the top end of the stainless steel base is further provided with an annular groove for connecting an external lead.
Preferably, the surface of the plastic shell is provided with threads and a sealing ring groove to ensure the sealing performance of the voltage-sharing electrode.
Preferably, the outer end of the plastic shell adopts a hexagonal nut structure.
Preferably, the top end of the stainless steel electrode is rounded.
Preferably, the top end of the stainless steel base is rounded.
Preferably, the plastic shell is of a one-piece structure.
The application provides an anti-corrosion voltage-sharing electrode for a converter valve, wherein a stainless steel electrode is in a U-shaped structure, namely a hollow cylindrical design, the inside and the outside of the stainless steel electrode are wrapped by plastic, and only a part of the electrode leaking from the inner wall is in direct contact with cooling water, so that the original clamping potential effect of the voltage-sharing electrode is ensured, the direct contact area of the electrode and the cooling water is greatly reduced, and the corrosion and deposition speed of the voltage-sharing electrode is greatly reduced; and the electrode is in an axisymmetric shape, so that the field intensity of the hollow inner cavity of the electrode is kept to be 0, and the [ Al (OH) in the cooling water is greatly weakened4]-，Al3+The migration volume of the plasma cluster to the hollow inner cavity of the electrode greatly reduces the electrochemical corrosion and deposition speed of the voltage-sharing electrode, even if the inner wall of the voltage-sharing electrode is attached with the scale for a long time, the scale can not fall off, and the water pipe is prevented from being blocked.
Drawings
Fig. 1 is a schematic structural view of a voltage-sharing electrode provided in the prior art of the present invention;
fig. 2 is a schematic structural diagram of the voltage-sharing electrode provided by the invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
During normal operation, electrochemical corrosion and deposition can occur on the voltage-sharing electrode, and the reaction is as follows:
on the anode mainly [ Al (OH)4]-The deposition is initiated, and the reaction is:
4[Al(OH)4]-→2Al2O3↓+8H2O+O2↑+4e-
on the cathode is mainly Al3+The deposition is initiated, and the reaction is:
4Al3++16OH-→2Al2O3↓+8H2O+O2↑+4e-
the ions are continuously transferred to the electrode under the action of the electric field, and insoluble substances Al (OH) are formed in the electrochemical process3And [ Al (OH) ]4]-And the like, to adhere to the voltage-sharing electrode to form scale.
Most traditional voltage-sharing electrodes are needle-shaped, the electric field intensity around the end part of the electrode needle is strong, large ion clusters are easily captured to form scaling substances, and the scaling substances even fall off after a long time, so that a water cooling system is blocked, and the safe operation of the system is seriously influenced.
In view of the above problems, the present application provides an anti-corrosion voltage-sharing electrode for a converter valve, as shown in fig. 2, in the drawing, 1 is a stainless steel base, 2 is a plastic shell, 3 is a stainless steel electrode, 4 is a bolt, 5 is a thread, 6 is a threaded hole, 7 is a seal ring groove, 8 is an annular groove, 9 is a rounded corner, 10 is a round hole, 11 is a hexagonal nut structure, and 12 is an electrode mounting hole; the device comprises a stainless steel base, a plastic shell and a stainless steel electrode;
the stainless steel electrode is of a U-shaped structure, the stainless steel base is of a convex structure, and the bottom end of the stainless steel base is connected with the bottom end of the stainless steel electrode in an inserting manner;
the plastic shell is sleeved on the bottom end of the stainless steel electrode and the outer portion of the bottom end of the stainless steel base, and the plastic outer sleeve is further sleeved on the top end of the stainless steel electrode and connected with the inner side of the top end and the bottom end to be not sleeved.
In the voltage-sharing electrode that this application provided, stainless steel base is protruding type structure, and it is close to stainless steel electrode end and is provided with the screw hole for consolidate the stainless steel electrode. The top of the stainless steel base is subjected to fillet treatment, and an annular groove is formed for connecting an external lead, so that the stainless steel base is prevented from falling off, and the operation safety is ensured. And the bottom end of the stainless steel base is provided with an electrode mounting hole for inserting a stainless steel electrode.
The plastic shell is made of plastic and is of an integrated structure. Be equipped with the round hole near the electrode end at plastic casing, its position keeps unanimous with the screw hole on the stainless steel base, but the diameter of round hole is 1 ~ 2mm bigger than the diameter of screw hole, guarantees that the bolt can twist the bolt hole smoothly. The surface of the plastic shell is provided with threads and a sealing ring groove, so that the tightness of the installation and the operation of the voltage-sharing electrode is ensured, and the water leakage event is prevented. The outer end of the plastic shell adopts a hexagonal nut structure, so that the time and labor are saved when the voltage-sharing electrode is installed and disassembled.
The stainless steel electrode is made of stainless steel and is of a U-shaped structure, namely the whole stainless steel electrode is of a cylindrical structure, the left half part is a hollow cylinder, and the right half part is a solid cylinder. The tip of the water-inserting part of the stainless steel electrode is rounded, so that the surrounding electric field intensity is greatly reduced.
The bolt is used for reinforcing the voltage-sharing electrode, fastening the connection of each part and ensuring that the stainless steel electrode cannot fall off.
The application provides a stainless steel electrode in voltage-sharing electrode adopts hollow cylinder design, all is wrapped up by plastics inside and outside, only spills partial electrode and cooling water direct contact at the inner wall moreover, has both guaranteed the original effect of clamp system electric potential of voltage-sharing electrode, has greatly reduced the direct contact area of electrode and cooling water again, greatly reduced the corruption and the deposition rate of voltage-sharing electrode. As for the stainless steel electrode, no matter how much voltage is carried, the electrode is an equipotential body and adopts a hollow cylinder design and is in an axisymmetric shape, so that the field intensity of a hollow inner cavity of the electrode is kept to be 0, and the [ Al (OH) ] in cooling water is greatly weakened4]-，Al3+The migration quantity of the plasma clusters to the hollow inner cavity of the electrode greatly reduces the electrochemical corrosion and deposition speed of the voltage-sharing electrode. Even though passing very muchAfter a long time, the inner wall of the voltage-sharing electrode is attached with the scale, the scale can not fall off, and the water pipe is prevented from being blocked.
Even if the top end of the voltage-sharing electrode is rounded, the field intensity of the top end of the electrode is weakened, but the field intensity of the top end area is still larger than that of other parts, but the top end is wrapped by plastic and is not in direct contact with cooling water, even if a large amount of ions are concentrated on the top end, electrochemical reaction cannot occur at the top end, and insoluble substances cannot be formed and attached to the top end and the outer surface of the voltage-sharing electrode.
In order to reduce the corrosion rate of the voltage-sharing electrode, the traditional voltage-sharing electrode adopts a platinum electrode, but the cost is high. The product adopts the stainless steel electrode, so the manufacturing cost is low, and the electrode is easy to replace during maintenance due to the superiority of an assembly structure, so the maintenance cost is reduced.
For further understanding of the present invention, the corrosion-proof voltage-sharing electrode for converter valve provided by the present invention is specifically described below with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Examples
As shown in fig. 2, the voltage-sharing electrode provided by the application has 4 parts: the device comprises a stainless steel base 1, a plastic shell 2, a stainless steel electrode 3 and a bolt 4;
the stainless steel base 1 is made of stainless steel, and a threaded hole 6 is formed in the side face, close to the electrode end, and plays a role in reinforcing the electrode; the top end of the stainless steel base is subjected to fillet treatment, and an annular groove 8 is formed for connecting an external lead, so that falling off is prevented, and the operation safety is ensured; the bottom end of the stainless steel base 1 is provided with an electrode mounting hole 12 for inserting the stainless steel electrode 3;
the plastic shell 2 is made of plastic and is of an integrated structure; a round hole 10 is arranged on the side surface of the plastic shell 2 close to the electrode end, the position of the round hole is consistent with that of a threaded hole in the stainless steel base 1, but the diameter of the round hole 10 is 1-2 mm larger than that of the threaded hole, so that a bolt can be smoothly screwed into the bolt hole; the surface of the plastic shell 2 is provided with threads 5 and a sealing ring groove 7, so that the sealing performance of the installation and the operation of the voltage-sharing electrode is ensured, and a water leakage event is prevented; the outer end of the plastic shell adopts a hexagonal nut structure 11, so that the time and labor are saved for mounting and dismounting the voltage-sharing electrode;
the stainless steel electrode 3 is made of stainless steel, and is integrally of a cylindrical structure, the left half part is a hollow cylinder, and the right half part is a solid cylinder; the round angle treatment 9 is carried out on the tip of the water inserting part of the stainless steel electrode 3, so that the surrounding electric field intensity is greatly reduced;
the bolt 4 is used for reinforcing the voltage-sharing electrode, fastening the connection of each part and ensuring that the stainless steel electrode 3 cannot fall off.
The installation step:
1. inserting the stainless steel electrode 3 into the electrode mounting hole 12 of the stainless steel base 1 to form a connector;
2. after aligning the threaded hole 6 on the base of the connector with the round hole 10 of the plastic shell 2, inserting the connector into the plastic shell 2;
3. screwing the bolt 4 into the bolt hole 6, and screwing the bolt 4 to reinforce the voltage-sharing electrode;
4. and (3) embedding the sealing ring into the sealing ring groove 7, and finally installing the voltage-sharing electrode on the cooling water pipe.
The order of the disassembling steps is reversed from the order of the installing steps.
The experimental results show that: the corrosion rate of the voltage equalizing electrode is reduced by more than 75 percent compared with the electrode in figure 2.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An anti-corrosion voltage-sharing electrode for a converter valve comprises a stainless steel base, a plastic shell and a stainless steel electrode;
the stainless steel electrode is of a U-shaped structure, the stainless steel base is of a convex structure, and the bottom end of the stainless steel base is connected with the bottom end of the stainless steel electrode in an inserting manner;
the plastic shell is sleeved on the bottom end of the stainless steel electrode and the outer portion of the bottom end of the stainless steel base, and the plastic outer sleeve is further sleeved on the top end of the stainless steel electrode and connected with the inner side of the top end and the bottom end to be not sleeved.
2. The voltage-sharing electrode according to claim 1, wherein the stainless steel base is provided with a threaded hole near the stainless steel electrode end, and the stainless steel electrode is fixed through a bolt.
3. The voltage-sharing electrode according to claim 2, wherein the plastic shell is further provided with a round hole corresponding to the threaded hole, and the diameter of the round hole is 1-2 mm larger than that of the threaded hole.
4. The voltage-sharing electrode according to claim 1, wherein the stainless steel base is further provided with an annular groove at the top end for connecting an external lead.
5. A voltage-sharing electrode according to claim 1, characterized in that the surface of the plastic housing is provided with threads and sealing ring grooves for ensuring the tightness of the voltage-sharing electrode.
6. The voltage-sharing electrode according to claim 1, wherein the outer end of the plastic outer shell is of a hexagonal nut structure.
7. A voltage grading electrode according to claim 1, wherein the top end of the stainless steel electrode is rounded.
8. The voltage grading electrode according to claim 1, wherein the top end of the stainless steel base is rounded.
9. A voltage-sharing electrode according to any one of claims 1 to 8, wherein the plastic casing is of one-piece construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111544285.1A CN114142746A (en) | 2021-12-16 | 2021-12-16 | Anti-corrosion voltage-sharing electrode for converter valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111544285.1A CN114142746A (en) | 2021-12-16 | 2021-12-16 | Anti-corrosion voltage-sharing electrode for converter valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114142746A true CN114142746A (en) | 2022-03-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111544285.1A Pending CN114142746A (en) | 2021-12-16 | 2021-12-16 | Anti-corrosion voltage-sharing electrode for converter valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114142746A (en) |
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2021
- 2021-12-16 CN CN202111544285.1A patent/CN114142746A/en active Pending
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