WO2019071953A1

WO2019071953A1 - Ultra high voltage direct current disk-type suspension insulator capable of inhibiting corrosion of metal electrodes

Info

Publication number: WO2019071953A1
Application number: PCT/CN2018/087549
Authority: WO
Inventors: 胡伟; 刘琴; 张德赛; 魏国强
Original assignee: 中国电力科学研究院有限公司; 湖北鑫德赛绝缘技术有限公司
Priority date: 2017-10-11
Filing date: 2018-05-18
Publication date: 2019-04-18
Also published as: CN207458685U

Abstract

An ultra high voltage direct current disk-type suspension insulator capable of inhibiting the corrosion of metal electrodes; a separated iron cap attachment system (1) is disposed outside of an iron cap electrode (3) of the insulator, and a steel foot attachment system (2) is disposed outside of a steel foot electrode (4); the separated iron cap attachment system and the steel foot attachment system are in close contact respectively with a lower brim of a steel cap and a part of a steel foot that is exposed in the air. The separated iron cap attachment system is formed by connecting left and right parts by using a manner of convex-concave combination, and an inclined upper surface (7) transitions from a sine curve (8) to a circular curve (9), and further to a conical slot (10) and a curved slot (11) of a lower surface. A smooth surface (17) of an upper surface of the steel foot attachment system transitions to an elbow (16), which transitions to an lower arc (15), a circular protruding head (14), an equipotential surface shape (13) and an upper arc (12).

Description

UHV DC disk type suspension insulator capable of suppressing corrosion of metal electrodes

Technical field

The present disclosure relates to an insulator for use in a power system, and more particularly to a UHV DC disk type suspension insulator capable of suppressing corrosion of a metal electrode.

Background technique

China's vast territory, the establishment of UHV transmission lines, the safe and reliable transmission of electrical energy from the power plant to the load center, plays an important role in the sustainable development of China's power resources and rapid economic development. UHV DC transmission has the advantages of long-distance, large-capacity transmission of electric energy, flexible regulation, and low power loss. It is of decisive significance in promoting the upgrading and sustainable development of the power industry, improving the utilization rate of transmission corridors, and solving the short-circuit current level of the grid.

In the UHV DC transmission project in China, during the power failure maintenance, it was found that the metal electrode of the UHV DC disk type suspension insulator (see Figure 9) gradually appeared corrosion. The same has happened in foreign operating practices. For example, in the DC electrified traffic track of the Russian heavy industrial area, the annual disc-shaped suspension insulators scrapped due to corrosion of metal electrodes is as high as 3%.

According to the research conclusions of relevant experts at home and abroad, the main hazard of the corrosion of the disk-type suspension insulator metal electrode in the transmission line is to reduce the mechanical strength of the insulator. When the electrode outside the insulator cement is directly corroded, the radius of the insulator electrode is reduced, resulting in a decrease in mechanical strength. When the electrode inside the insulator is corroded, the corrosion product expands, and the generated stress causes the insulator of the insulator to burst. In either case, the corrosion of the electrode will have a great influence on the mechanical strength of the insulator, and a vicious accident such as a dropped wire will seriously threaten the safe and stable operation of the power system. Therefore, it is necessary to pay attention to the hazard of the corrosion of the insulator metal electrode, and propose methods and ways to solve the corrosion problem.

The main reason for the corrosion of the insulator metal electrode is caused by the leakage current on the surface; the contamination and moisture on the surface of the insulator are necessary for generating leakage current; another reason for the corrosion of the insulator metal electrode is that partial discharge near the electrode is generated. ozone. Corrosion of the disc suspension insulators usually occurs on the cement adhesive surface near the steel feet, so the corrosion of the steel feet is much more severe than the corrosion of the lower edge of the iron cap.

In the "insulator capable of reducing corona loss and electromagnetic wave interference and improving the corrosion resistance of the metal fittings" (Chinese Patent No. 201410006899.8), the applicant discloses a steel foot attachment system at the steel foot of a porcelain or glass disk-shaped suspension insulator and / Or iron cap attachment system is provided at the iron cap. The outer insulation part of the steel foot attachment system and the iron cap attachment system is water-repellent, which greatly reduces the leakage current of the dirt layer on the insulator surface, and further increases the creepage distance, which further reduces the leakage current, effectively limiting the electrolytic corrosion. produce. In addition, the outer portions of the steel foot attachment system and the iron cap attachment system are made of an organic material, thereby increasing the contamination flashover voltage of the insulator.

In order to make the above patents more popular in practical applications, it is necessary to further improve and multiply the patents, and propose a separate accessory with self-cleaning, reducing the motion charge force, and assembling. UHV DC disk type suspension insulators that are convenient and easy to construct.

Summary of the invention

The purpose of the embodiments of the present disclosure is to provide a method for reducing the leakage current; effectively improving the outer insulation strength of the insulator; effectively reducing the oxidation of the ozone; and facilitating the assembly and facilitating the corrosion of the metal electrode. UHV DC disk type suspension insulator.

The realization of the object of the embodiments of the present disclosure is an ultra-high voltage DC disk type suspension insulator capable of suppressing corrosion of a metal electrode, a separate iron cap attachment system at the iron cap electrode of the insulator, and a steel foot attachment at the steel leg electrode System; the separate iron cap attachment system and the steel foot attachment system are in intimate contact with the iron cap jaw and the portion of the steel foot exposed in the air, respectively;

The separate iron cap attachment system is formed by connecting the left and right parts by a combination of concave and convex; the upper surface of the inclined shape of the separate iron cap attachment system is transformed from a sinusoidal curve to a circular arc curve, and a circular arc curve transition a tapered groove to the lower surface, the tapered groove is connected to the curved groove;

The upper surface of the steel foot attachment system adopts a smooth surface of an equipotential shape to transition to the elbow; the elbow transitions to a lower arc of the lower surface, and a circular protrusion between the upper arc and the lower arc, the upper circle An equidistant shape is used between the arc and the circular nose.

The technical solution of the embodiments of the present disclosure has the following advantages:

1. The separate iron cap attachment system adopts the connection method of bump and bump. It does not need to disassemble the insulator when installing on site, and the assembly is convenient and easy to construct;

2. The upper surface of the separate iron cap attachment system adopts an elliptical smooth surface, which increases the natural cleaning ability of the rainwater, increases the difficulty of depositing the dirt on the surface, and reduces the leakage current;

3. The lower surface of the separate iron cap attachment system consists of a convex circular shape and a concave circular shape. The surface of this shape can also increase the natural cleaning ability of rainwater and make the contaminated material difficult to deposit on its surface, reducing leakage. Current

4. The shape of the lower surface of the separate iron cap attachment system whose upper surface of the split iron cap attachment system transitions from a sinusoidal curve to a circular arc curve ensures the uniformity of the electric field distribution at the edge of the separate iron cap attachment system. Effectively improve the insulation strength of the insulator;

5. The upper surface of the steel foot attachment system that is not in contact with the original insulator adopts a smooth surface with an equipotential surface shape, which can reduce the force of moving the electric charge on the surface thereof;

6. The structure of the lower surface of the steel foot attachment system not only increases the creepage distance, but also increases the natural cleaning ability of the rainwater, and makes the contaminated matter difficult to deposit on its surface; the rest of the lower surface adopts the equipotential shape, The movement of charge on this surface slows down;

7. The separate iron cap attachment system and the steel foot attachment system are in close contact with the part of the iron cap and the steel foot exposed in the air, respectively, which effectively weakens the generation of electrochemical corrosion;

8. The separate iron cap attachment system and the steel foot attachment system are in close contact with the part of the iron cap and the steel foot exposed in the air, which effectively reduces the corona discharge of the metal electrode and effectively weakens the oxidation caused by ozone;

9. The steel foot attachment system is in close contact with the surface of the cement adhesive near the steel foot, which effectively limits the corrosion of the steel foot.

DRAWINGS

1 is an assembled view of a split iron cap attachment system at an iron cap according to an embodiment of the present disclosure,

2 is a schematic structural view of a separate iron cap attachment system according to an embodiment of the present disclosure,

Figure 3 is a schematic structural view of a separate iron cap attachment system,

4 is a partial structural diagram of a right split iron cap attachment system according to an embodiment of the present disclosure

Figure 5 is a right side elevational view showing a portion of the left split iron cap attachment system of the embodiment of the present disclosure,

Figure 6 is an assembly view of a steel foot attachment system at a steel foot according to an embodiment of the present disclosure,

7 is a schematic structural view of a steel foot attachment system according to an embodiment of the present disclosure,

8 is an assembled view of a separate iron cap attachment system and a steel foot attachment system according to an embodiment of the present disclosure,

Figure 9 is a schematic view showing the structure of an ultra-high voltage DC disk suspension insulator without an accessory system.

Detailed ways

Embodiments of the present disclosure are directed to providing a UHV DC disk type suspension insulator capable of suppressing corrosion of a metal electrode, wherein a separate iron cap attachment system is disposed at an iron cap electrode of the insulator, and a steel foot attachment system is disposed at the steel leg electrode.

Embodiments of the present disclosure will be described in detail below with reference to the drawings.

Referring to Fig. 1, a separate iron cap attachment system 1 is provided at the iron cap 3 of the UHV DC disk-shaped suspension insulator. When the accessory system 1 is installed on site, the insulator is not required to be disassembled, and the assembly is convenient and convenient for construction.

Separate iron cap attachment system 1 iron cap squat close contact, effectively reducing the occurrence of electrochemical corrosion.

The separate iron cap attachment system 1 is in close contact with the iron cap squat, which effectively reduces the corona discharge of the metal electrode and effectively weakens the oxidation of ozone.

The left iron cap attachment system 1-2 of the split iron cap attachment system 1 has a recess 6. The right iron cap attachment system 1-1 has a projection 5 that cooperates with the groove, and the two portions of the projection insertion groove are combined with the concave and convex portions. A separate iron cap attachment system as shown in Figure 2.

Referring to Fig. 3, the upper surface 7 of the split iron cap attachment system has a transition from a sinusoidal curve 8 to a circular arc curve 9, the arcuate curve transitions to the tapered groove 10 of the lower surface, and the tapered groove is connected to the curved groove 11 .

The upper surface of the inclined surface has a slope of 73.5 mm and an inclination angle of 12°; the sinusoidal curve 8 has an arc length of 26 mm, and the radius of the circular curve 9 is 15 mm; the tapered groove 10 has a width of 17.5 mm and a depth of 8 mm, and the radius of the curved groove 11 It is 13mm.

The main cause of corrosion of the insulator metal electrode is caused by leakage current on its surface. The contamination and moisture on the surface of the insulator are necessary for generating leakage current. The upper surface 7 of the split iron cap attachment system adopts a smooth surface with a bevel shape, which increases the natural cleaning ability of the rainwater and also increases the difficulty of depositing the dirt on the surface.

The surface design of the upper surface of the upper surface of the split iron cap attachment system, the sinusoidal curve 8, and the circular arc curve 9 ensures the uniformity of the electric field distribution at the edge of the separate iron cap attachment system, and effectively improves the insulator. Outer insulation strength.

The circular arc curve 9, the tapered groove 10, and the surface of the curved groove 11 on the lower surface of the separate iron cap attachment system can also increase the natural cleaning ability of the rainwater and make the dirty substance difficult to deposit on the surface thereof.

The split iron cap attachment system 1 is made of organic material and has water repellency, which greatly reduces the leakage current of the dirt layer on the insulator surface, and further increases the creepage distance, which further reduces the leakage current, effectively limiting the generation of electrolytic corrosion. .

Referring to Figure 6, a steel foot attachment system 2 is provided at the UHV DC disc suspension insulator steel foot 4. The steel foot attachment system 2 is in close contact with the exposed portion of the steel foot in the air, effectively reducing the occurrence of electrochemical corrosion. The steel foot attachment system is in close contact with the part of the steel foot exposed in the air, which effectively reduces the corona discharge of the steel foot and effectively weakens the oxidation of ozone.

Referring to Figure 7, the upper surface of the steel foot attachment system transitions to the elbow 16 using a smooth surface 17 of equipotential shape; the elbow transitions to the lower arc 15 of the lower surface, and there is a circle between the upper arc 12 and the lower arc The convex head 14 has an equipotential shape 13 between the upper circular arc and the circular convex head.

The radius of the arc of the circular protrusion 14 is 9 mm, the radius of the arc of the upper arc 12 is 7 mm, the radius of the arc of the lower arc 15 is 5 mm, the radius of the arc of the elbow 16 is 15 mm, and the shape of the equilateral plane 13 is 13 The arc length is 10mm. The smooth surface 17 of the upper surface of the steel foot attachment system has an arc length of 43.5 mm.

The surface design of the upper arc 12, the circular head 14 and the lower arc 15 of the steel foot attachment system not only increases the creepage distance, but also increases the natural cleaning ability of the rainwater, and makes the dirty substance difficult to deposit on the surface thereof; The elbow 16 facilitates the fall of rain. The equipotential shape 13 of the lower surface causes the charge to slow down on this surface.

The steel foot attachment system 2 is made of organic material and has water repellency, so that the leakage current of the dirt layer on the insulator surface is greatly reduced, and the leakage current is further reduced due to the increase of the creepage distance, which effectively limits the generation of electrolytic corrosion.

The smooth surface 17 of the equipotential surface of the upper surface of the steel foot attachment system can reduce the force of moving the charge on its surface.

Referring to Figure 8, an embodiment of the present disclosure provides a split iron cap attachment system 1 at the iron cap electrode 3 of the insulator and a steel foot attachment system 2 at the steel leg electrode 4. The separate iron cap attachment system and the steel foot attachment system are in close contact with the part of the iron cap and the steel foot exposed in the air, respectively, effectively reducing the corona discharge of the metal electrode, and effectively reducing the oxidation effect of ozone;

The steel foot attachment system is in close contact with the cement adhesive surface near the steel foot, effectively limiting the corrosion of the steel foot.

The split iron cap attachment system and the steel foot attachment system of the embodiments of the present disclosure are made of an organic material, have water repellency, and the leakage current of the surface of the insulator is greatly reduced, and the leakage current is further increased by increasing the creepage distance. The reduction effectively limits the generation of electrolytic corrosion.

Industrial applicability

In the technical solution of the embodiment of the present disclosure, the split iron cap attachment system adopts a combination of concave and convex connection, and does not need to disassemble the insulator when installed in the field, and is convenient to assemble and convenient for construction; the upper surface of the separated iron cap attachment system adopts an elliptical smooth surface. , which increases the natural cleaning ability of rainwater, increases the difficulty of depositing dirt on its surface, and reduces leakage current; the lower surface of the separate iron cap attachment system consists of convex circular and concave circular shapes, which The shape of the surface can also increase the natural cleaning ability of rainwater and make the fouling material difficult to deposit on its surface, reducing the leakage current; the separation iron cap attachment system has a sinusoidal curve transition to a circular arc curve. The shape design of the lower surface of the accessory system ensures the uniformity of the electric field distribution at the edge of the separated iron cap attachment system, and effectively improves the outer insulation strength of the insulator; the upper surface of the steel foot attachment system and the original insulator non-contacting adopts the equipotential surface a smooth surface of the shape that reduces the force of motion on its surface; The structure of the lower surface not only increases the creepage distance, but also increases the natural cleaning ability of the rainwater, and makes the contaminated matter difficult to deposit on its surface; the rest of the lower surface adopts the equipotential shape, so that the electric charge moves on this surface. Slowdown; the separate iron cap attachment system and the steel foot attachment system are in close contact with the iron cap jaws and the exposed portions of the steel feet in the air, respectively, effectively weakening the generation of electrochemical corrosion; separate iron cap attachment system and steel foot attachments The system is in close contact with the iron cap and the part of the steel foot exposed in the air, which effectively reduces the corona discharge of the metal electrode and effectively weakens the oxidation of ozone; the steel foot attachment system is closely related to the cement adhesive surface near the steel foot. Contact, effectively limits the corrosion of the steel feet.

Claims

An ultra-high voltage DC disk type suspension insulator capable of suppressing corrosion of a metal electrode, comprising: an insulator, a separate iron cap attachment system is disposed at an iron cap electrode of the insulator, and a steel foot is disposed at a steel leg electrode of the insulator An accessory system; the separate iron cap attachment system and the steel foot attachment system are in intimate contact with a portion of the iron cap jaw and the steel foot exposed to the air, respectively;

The split iron cap attachment system is formed by connecting the left and right portions by a combination of concave and convex; the upper surface of the inclined shape of the separate iron cap attachment system is transformed from a sinusoidal curve to a circular arc curve, and a circular arc shape The curve transitions to a tapered groove on the lower surface, and the tapered groove is connected to the curved groove;

The upper surface of the steel foot attachment system adopts a smooth surface of an equipotential shape to transition to the elbow; the elbow transitions to a lower arc of the lower surface, and a circular protrusion between the upper arc and the lower arc, the upper circle An equidistant shape is used between the arc and the circular nose.
The UHV DC disk type suspension insulator capable of suppressing corrosion of a metal electrode according to claim 1, wherein:

The upper surface of the inclined iron cap attachment system has a slope of 73.5 mm, an inclination angle of 12°, a sinusoidal curve arc length of 26 mm, a radius of a circular curve of 15 mm, and a tapered groove width of 17.5 mm and a depth of 8 mm. The radius of the curved groove is 13 mm.
The UHV DC disk type suspension insulator capable of suppressing corrosion of a metal electrode according to claim 1, wherein:

The circular protrusion of the steel foot attachment system has a circular arc radius of 9 mm, an upper circular arc radius of 7 mm, a lower circular arc radius of 5 mm, and an elbow circular arc radius of 15 mm.
The UHV DC disk type suspension insulator capable of suppressing corrosion of a metal electrode according to claim 1, wherein:

The arc surface of the steel foot attachment system has an arc length of 10 mm; the smooth surface of the upper surface of the steel foot attachment system has an arc length of 43.5 mm.
The UHV DC disk type suspension insulator capable of suppressing corrosion of a metal electrode according to claim 1, wherein:

The split iron cap attachment system and the steel foot attachment system are made of an organic material.