CN111987484A - Array type electrode needle voltage-sharing electrode and preparation method thereof - Google Patents
Array type electrode needle voltage-sharing electrode and preparation method thereof Download PDFInfo
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- CN111987484A CN111987484A CN202010838564.8A CN202010838564A CN111987484A CN 111987484 A CN111987484 A CN 111987484A CN 202010838564 A CN202010838564 A CN 202010838564A CN 111987484 A CN111987484 A CN 111987484A
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- electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R3/00—Electrically-conductive connections not otherwise provided for
- H01R3/08—Electrically-conductive connections not otherwise provided for for making connection to a liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14639—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/40—Securing contact members in or to a base or case; Insulating of contact members
- H01R13/405—Securing in non-demountable manner, e.g. moulding, riveting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/20—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for assembling or disassembling contact members with insulating base, case or sleeve
Abstract
The invention relates to the field of high-voltage direct-current transmission, and discloses an array type electrode pin voltage-sharing electrode of a high-voltage direct-current transmission valve cooling system, which is made of at least two materials of palladium and/or rhodium and/or ruthenium and/or cerium alloy materials. According to the invention, the palladium-rhodium-ruthenium-cerium alloy is used as the material of the voltage-sharing electrode probe, and the palladium-rhodium-ruthenium-cerium alloy with a proper proportion of components can effectively slow down the water electrolysis reaction even in the high-voltage, high-flow-rate and high-temperature field environment, so that the local pH value on the surface of the voltage-sharing electrode probe can be regulated and controlled, and the purpose of slowing down the scaling of the voltage-sharing electrode is achieved.
Description
Technical Field
The invention relates to the field of high-voltage direct-current transmission valve cooling, in particular to an array type electrode pin voltage-sharing electrode of a high-voltage direct-current transmission valve cooling system and a preparation method thereof.
Background
The high-voltage direct-current converter valve is the most important primary equipment in a direct-current transmission project and is core equipment for interconversion between alternating current and direct current. The converter valve section raises and lowers the voltage between 380V and the transmission voltage (500-1200 kV). The voltage difference of each group of converter valve sections is higher than 10 kV. A large amount of internal cooling water of a valve cooling system required by heat generated in the process of current conversion and voltage increase and decrease of the converter valve is brought out of the valve hall.
The voltage-sharing electrodes are inserted into the internal cooling water in front of and behind each group of converter valve sections so as to reduce the potential difference of the internal cooling water in the water pipe of the valve cooling system and reduce the leakage current of a self-corrosion loop formed by the internal cooling water, the voltage-sharing electrodes and the like. The voltage-sharing electrodes at two ends of the converter valve section are in cold water in high potential difference, and potential hazards which are not beneficial to high-voltage direct-current transmission production, such as water electrolysis reaction (oxygen evolution and hydrogen evolution), electrode scaling (aluminum ions and hydroxide radicals are combined to form aluminum hydroxide precipitate) and the like exist.
The electrode needle of traditional voltage-sharing electrode is cylinder platinum, and electrode needle one end riveting is on voltage-sharing electrode base, and the whole cylinder platinum material electrode needle of the other end exposes in interior cold water, and voltage-sharing electrode base is fixed on the water pipe wall based on the sealing washer. The platinum electrode needle has a diameter of about 2-4 mm and a length of about 30-50 mm. After the high-voltage direct-current transmission production is operated for a period of time, the traditional voltage-sharing electrode has the conditions of surface scaling, electrode sealing ring aging, water leakage and the like, so that the potential production hazard is prominent. The essential reason is that the electrode needle generates aluminum hydroxide deposition on the surface of the electrode needle locally due to oxygen evolution and hydrogen evolution reaction caused by current leakage under high potential and strong magnetic field.
Disclosure of Invention
In view of the above defects in the prior art, a first object of the present invention is to provide an array electrode pin voltage-sharing electrode for a high voltage dc power transmission valve cooling system, which can effectively reduce self-corrosion current on the surface of an electrode pin, and uniformly distribute an electric field on the surface of the electrode pin, so as to achieve the purpose of slowing down scaling of the voltage-sharing electrode.
In order to achieve the above purpose, the solution adopted by the invention is as follows:
the array electrode pin voltage-sharing electrode comprises electrode pins and an electric insulating material wrapping the electrode pins, wherein the electrode pins are uniformly distributed in the electric insulating material in an array mode.
A preparation method of an array electrode needle voltage-sharing electrode comprises the following steps:
(1) injecting a molten-state electric insulating material into the circular electrode mold, and vertically and uniformly immersing a plurality of electrode needles into the electric insulating material, wherein the plurality of electrode needles are distributed in an array form in the electric insulating material;
(2) heating to make the electrode needle fully soak in the electric insulating material, and then cooling, sealing and curing.
(3) One end of the electrode needle is fixed with the copper wire by using conductive adhesive; and removing the die, and polishing the working surface of the voltage-sharing electrode to obtain the array electrode pin voltage-sharing electrode.
The invention has the beneficial effects that:
according to the array type electrode needle, the electric field potential lines on the surface of the electrode needle are uniformly distributed, the self-corrosion current is low, forced convection of a diffusion layer on the surface of the electrode needle is facilitated, the self-corrosion current on the surface of the electrode needle can be effectively reduced, the electric field on the surface of the electrode needle which is uniformly distributed, the water decomposition reaction on the surface of the electrode needle can be obviously reduced, nucleation, growth and deposition of scaling substances are not facilitated, and therefore the purpose of retarding scaling of a voltage-sharing electrode is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an array voltage-sharing electrode according to an embodiment of the present invention.
1-electrode needle, 2-electric insulating material and 3-copper wire.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The array type electrode pin voltage-sharing electrode of the high-voltage direct-current transmission valve cooling system provided by the embodiment of the invention is specifically described below.
An array type electrode needle 1 voltage-sharing electrode comprises an electrode needle 1 and an electric insulating material 2 wrapping the electrode needle 1, wherein the electrode needles 1 are uniformly distributed in the electric insulating material 2 in an array manner.
Furthermore, the voltage-sharing electrode is arranged in a cylinder shape, one end of the voltage-sharing electrode is arranged in an open manner, and the electrode needle 1 is exposed on the outer surface of the voltage-sharing electrode; the other end of the voltage-sharing electrode is sealed, the tail ends of the electrode needles 1 are communicated with the copper wire 3, and the copper wire 3 is led out from the outer surface of the voltage-sharing electrode.
When the valve cooling system is used, one end of the voltage-sharing electrode, which is exposed out of the electrode needle 1, is placed in internal cold water, and the copper wire 3 at the other end is communicated with high-voltage direct-current power transmission equipment, so that the potential difference of the internal cold water in a water pipe of the valve cooling system is reduced, and the leakage current of a self-corrosion loop formed by the internal cold water, the voltage-sharing electrode and the like is reduced.
It should be noted that, the array electrode needle 1 voltage-sharing electrode of the invention, only the electrode needle 1 cross-section is exposed in the cold water, its characteristic is that the contact area of single electrode needle 1 and cold water is small, and the electric field on the surface of the electrode needles 1 arranged in array superposes and diffracts each other, tend to distribute evenly. The array type electrode needle 1 voltage-sharing electrode has the following advantages: 1) the electrode and the electrode needle 1 can be ensured to be fully contacted with the inner cooling water, and low contact impedance can be maintained, and the low impedance can maintain the low potential difference of the inner cooling water in the water pipe of the valve cooling system; 2) the electric field distribution on the surface of the electrode needles 1 arranged in an array manner is more uniform compared with that of a traditional single cylindrical electrode with the same diameter, so that the corrosion current density of the electrode needles 1 is lower, the water decomposition reaction on the surface of the electrode needles 1 can be obviously reduced, the low hydroxyl concentration is maintained, the concentration product of hydroxyl and aluminum ions can be obviously reduced, and the scaling of a voltage-sharing electrode is slowed down; 3) the flow of cold water in the valve cold water pipe, the forced convection phenomenon on the surface of the pressure-equalizing electrode needle 1 is prominent, the concentration difference of scaling ions is low, the existing area is small, and aluminum hydroxide precipitates are not easy to nucleate, grow and deposit; 4) the exposed area of a single electrode needle 1 of the array electrode in cold water is smaller than that of a traditional voltage-sharing electrode, the combination energy of aluminum hydroxide and the electrode is reduced, aluminum hydroxide scaling substances are not easy to attach to the surface of the electrode needle 1, and the problem of scaling of the voltage-sharing electrode is effectively solved.
Furthermore, 4-100 electrode needles 1 are arranged and evenly and vertically distributed in the electric insulation material 2.
Further, the diameter of each electrode needle 1 is 10 nm-100 nm.
Furthermore, the diameter of the voltage-sharing electrode is 4 mm-20 mm.
Further, the electrode needle 1 is made of graphite, platinum, iridium, and platinum-iridium alloy.
Further, the electrode needle 1 is made of platinum-iridium alloy and comprises the following components in percentage by mass: 95-99.5% of platinum and 0.5-5% of iridium.
According to the invention, the platinum-iridium alloy with a proper proportion of components is used as the material of the electrode needle 1, and the electrode needle has a high proper hydrogen evolution and oxygen evolution overpotential in low-conductivity cold water, so that the water electrolysis reaction on the surface of the probe of the voltage-sharing electrode can be effectively slowed down, and the local low OH-concentration on the surface of the probe can be maintained. The low OH-concentration enables localized Al3+ to OH concentration products to be much lower than the Al (OH)3 solubility product, thereby achieving a reduction in Al (OH)3 formation and deposition to slow down grading electrode scaling.
Further, the electrical insulating material 2 is one or more of polyvinylidene fluoride, polytetrafluoroethylene, phenolic resin, polyethylene, polypropylene, quartz and glass.
A preparation method of an array electrode needle 1 voltage-sharing electrode comprises the following steps:
(1) injecting the molten-state electric insulating material 2 into a circular electrode mold, and vertically and uniformly immersing a plurality of electrode needles 1 into the electric insulating material 2, wherein the plurality of electrode needles 1 are distributed in the electric insulating material 2 in an array manner;
(2) heating to make the electrode needle 1 fully soak in the electric insulating material 2, and then cooling, sealing and curing.
(3) One end of the electrode needle 1 is fixed with the copper wire 3 by using conductive adhesive; and removing the die, and polishing the working surface of the voltage-sharing electrode to obtain the array type electrode pin 1 voltage-sharing electrode.
Example 1
An array electrode needle voltage-sharing electrode comprises electrode needles and an electric insulating material wrapping the electrode needles, wherein the voltage-sharing electrode is arranged in a cylinder shape, the diameter of the working surface of the voltage-sharing electrode is 20mm, and the diameter of each electrode needle is 20nm, wherein 100 electrode needles are arranged in the cylinder shape; the electrode needle is made of graphite, and the electric insulation material is polytetrafluoroethylene.
A preparation method of an array electrode needle voltage-sharing electrode comprises the following steps: one end of an electrode needle is immersed into a molten state insulating material in an argon or nitrogen atmosphere, the electrode needle is orderly placed in a circular electrode mould with the required size in an array mode after slurry coating, the electrode needle is heated to fully infiltrate the electric insulating material and the slurry coating, then the temperature is reduced, the sealing and the solidification are carried out, the other end of the electrode needle is fixed with a copper lead by using a conductive adhesive, and the copper lead is led out from the other end of the electrode; and removing the die, and polishing the working surface of the voltage-sharing electrode to be bright to obtain the array electrode pin voltage-sharing electrode.
Example 2
An array electrode needle voltage-sharing electrode comprises electrode needles and an electric insulating material wrapping the electrode needles, wherein the voltage-sharing electrode is arranged in a cylinder shape, the diameter of the working surface of the voltage-sharing electrode is 4mm, 10 electrode needles are arranged, and the diameter of the voltage-sharing electrode is 10 nm; the electrode needle is made of platinum, and the electric insulation material is phenolic resin.
The preparation method of the array electrode needle voltage-sharing electrode is consistent with that of the embodiment 1.
Example 3
An array electrode needle voltage-sharing electrode comprises electrode needles and an electric insulating material wrapping the electrode needles, wherein the voltage-sharing electrode is arranged in a cylinder shape, the diameter of the working surface of the voltage-sharing electrode is 10mm, 40 electrode needles are arranged, and the diameter of the voltage-sharing electrode is 50 nm; the electrode needle is made of iridium, and the electric insulation material is polypropylene.
The preparation method of the array electrode needle voltage-sharing electrode is consistent with that of the embodiment 1.
Example 4
An array electrode needle voltage-sharing electrode comprises electrode needles and an electric insulating material wrapping the electrode needles, wherein the voltage-sharing electrode is arranged in a cylinder shape, the diameter of the working surface of the voltage-sharing electrode is 15mm, and the diameter of the voltage-sharing electrode is 25nm, wherein the electrode needles are 60; the electrode needle is made of graphite, and the electric insulation material is glass.
The preparation method of the array electrode needle voltage-sharing electrode is consistent with that of the embodiment 1.
Example 5
An array electrode needle voltage-sharing electrode comprises electrode needles and an electric insulating material wrapping the electrode needles, wherein the voltage-sharing electrode is arranged in a cylinder shape, the diameter of the working surface of the voltage-sharing electrode is 6mm, 4 electrode needles are arranged, and the diameter of each electrode needle is 12 nm; the electrode needle is made of platinum and the electric insulation material is quartz.
The preparation method of the array electrode needle voltage-sharing electrode is consistent with that of the embodiment 1.
Example 6
An array electrode needle voltage-sharing electrode comprises electrode needles and an electric insulating material wrapping the electrode needles, wherein the voltage-sharing electrode is arranged in a cylinder shape, the diameter of the working surface of the voltage-sharing electrode is 12mm, and the diameter of each electrode needle is 80 nm; the electrode needle is made of iridium, and the electric insulation material is polyvinylidene fluoride.
The preparation method of the array electrode needle voltage-sharing electrode is consistent with that of the embodiment 1.
Example 7
An array electrode needle voltage-sharing electrode comprises electrode needles and an electric insulating material wrapping the electrode needles, wherein the voltage-sharing electrode is arranged in a cylinder shape, the diameter of the working surface of the voltage-sharing electrode is 16mm, and the diameter of each electrode needle is 40nm, and the diameter of each electrode needle is 30; the electrode needle is made of platinum-iridium alloy (comprising 99.5% of platinum and 0.5% of iridium by mass percent) and the electric insulating material is polyethylene.
The preparation method of the array electrode needle voltage-sharing electrode is consistent with that of the embodiment 1.
Example 8
An array electrode needle voltage-sharing electrode comprises electrode needles and an electric insulating material wrapping the electrode needles, wherein the voltage-sharing electrode is arranged in a cylinder shape, the diameter of the working surface of the voltage-sharing electrode is 20mm, the number of the electrode needles is 60, and the diameter of the electrode needles is 60 nm; the electrode needle is made of platinum-iridium alloy (the components comprise, by mass, 95% of platinum and 5% of iridium), and the electric insulating material is phenolic resin.
The preparation method of the array electrode needle voltage-sharing electrode is consistent with that of the embodiment 1.
Example 9
An array electrode needle voltage-sharing electrode comprises electrode needles and an electric insulating material wrapping the electrode needles, wherein the voltage-sharing electrode is arranged in a cylinder shape, the diameter of the working surface of the voltage-sharing electrode is 10mm, 40 electrode needles are arranged, and the diameter of the voltage-sharing electrode is 50 nm; the electrode needle is made of platinum-iridium alloy (the components comprise 96.5% of platinum and 3.5% of iridium by mass percent), and the electric insulating material is polypropylene.
The preparation method of the array electrode needle voltage-sharing electrode is consistent with that of the embodiment 1.
Example 10
An array electrode needle voltage-sharing electrode comprises electrode needles and an electric insulating material wrapping the electrode needles, wherein the voltage-sharing electrode is arranged in a cylinder shape, the diameter of the working surface of the voltage-sharing electrode is 10mm, 40 electrode needles are arranged, and the diameter of the voltage-sharing electrode is 50 nm; the electrode needle is made of platinum-iridium alloy (the components comprise, by mass, 98% of platinum and 2% of iridium), and the electric insulating material is phenolic resin.
The preparation method of the array electrode needle voltage-sharing electrode is consistent with that of the embodiment 1.
Experimental example 1
The voltage-sharing electrodes of the above examples 1 to 10 were used as experimental examples 1 to 10, and the voltage-sharing electrodes of the experimental examples 1 to 10 were completely placed in cold water in an environment of high voltage (15kv), high flow rate (10m/s), and high temperature field (60 ℃), and the surface fouling was observed:
table 1 experimental examples 1-10 testing of fouling of voltage-sharing electrodes
As can be seen from the above table: according to the invention, the palladium-rhodium-ruthenium-cerium alloy is used as the material of the voltage-sharing electrode probe, and the palladium-rhodium-ruthenium-cerium alloy with a proper proportion of components can effectively slow down the water electrolysis reaction even in a high-voltage, high-flow-rate and high-temperature field environment for a long time of 60 days, so that the local pH value on the surface of the voltage-sharing electrode probe can be regulated and controlled, and the purpose of slowing down the scaling of the voltage-sharing electrode is achieved.
In conclusion, the array type electrode needle can effectively reduce the self-corrosion current on the surface of the electrode needle, and the electric field on the surface of the electrode needle is uniformly distributed, so that the aim of slowing down the scaling of the voltage-sharing electrode is fulfilled.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The array electrode pin voltage-sharing electrode is characterized by comprising electrode pins and an electric insulating material wrapping the electrode pins, wherein the electrode pins are uniformly distributed in the electric insulating material in an array mode.
2. The array-type electrode needle voltage-sharing electrode according to claim 1, wherein the voltage-sharing electrode is arranged in a cylinder shape, one end of the voltage-sharing electrode is arranged in an open shape, and the electrode needle is exposed on the outer surface of the voltage-sharing electrode; the other end of the voltage-sharing electrode is sealed, the tail ends of the electrode needles are communicated with a copper wire, and the copper wire is led out from the outer surface of the voltage-sharing electrode.
3. The array electrode needle voltage-sharing electrode according to claim 2, wherein 4 to 100 electrode needles are arranged and uniformly and vertically distributed in the electrically insulating material.
4. The array electrode needle voltage-sharing electrode according to claim 3, wherein each electrode needle has a diameter of 10nm to 100 nm.
5. The array electrode needle voltage-sharing electrode according to claim 4, wherein the voltage-sharing electrode has a diameter of 4mm to 20mm and a length of 20mm to 100 mm.
6. The array electrode needle voltage-sharing electrode according to any one of claims 1 to 4, wherein the electrode needles are made of graphite, platinum, iridium or platinum-iridium alloy.
7. The array electrode needle voltage-sharing electrode as claimed in claim 6, wherein the platinum-iridium alloy of the electrode needle comprises the following components in percentage by mass: 95-99.5% of platinum and 0.5-5% of iridium.
8. The array electrode needle voltage-sharing electrode according to claim 1, wherein the electrically insulating material is one or more of polyvinylidene fluoride, polytetrafluoroethylene, phenolic resin, polyethylene, polypropylene, quartz and glass.
9. A method for preparing an array electrode needle voltage-sharing electrode according to any one of claims 1 to 8, which comprises the following steps:
(1) injecting a molten-state electric insulating material into the circular electrode mold, and vertically and uniformly immersing a plurality of electrode needles into the electric insulating material, wherein the plurality of electrode needles are distributed in an array form in the electric insulating material;
(2) heating to make the electrode needle fully soak in the electric insulating material, and then cooling, sealing and curing.
(3) One end of the electrode needle is fixed with the copper wire by using conductive adhesive; and removing the die, and polishing the working surface of the voltage-sharing electrode to obtain the array electrode pin voltage-sharing electrode.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103187105A (en) * | 2011-12-28 | 2013-07-03 | 核工业西南物理研究院 | Turbulent momentum transport probe array |
| CN207468260U (en) * | 2017-11-16 | 2018-06-08 | 云南电网有限责任公司电力科学研究院 | A kind of corrosion product capturing device |
| CN109756131A (en) * | 2019-03-06 | 2019-05-14 | 重庆大学 | A kind of converter valve cooling system porous graphite screening electrodes |
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- 2020-08-19 CN CN202010838564.8A patent/CN111987484B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103187105A (en) * | 2011-12-28 | 2013-07-03 | 核工业西南物理研究院 | Turbulent momentum transport probe array |
| CN207468260U (en) * | 2017-11-16 | 2018-06-08 | 云南电网有限责任公司电力科学研究院 | A kind of corrosion product capturing device |
| CN109756131A (en) * | 2019-03-06 | 2019-05-14 | 重庆大学 | A kind of converter valve cooling system porous graphite screening electrodes |
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