Three-section type double adjustable phase-to-phase spacer for 1000kV extra-high voltage

Abstract

The invention discloses a three-section type double-adjustable phase-to-phase spacer for 1000kV extra-high voltage. The three-section type double-adjustable phase-to-phase spacer comprises a three-section type composite insulator unit, an eight-bundle sub-conductor connecting unit, a double-adjusting unit, an armor rod and an equipotential line. The three-section type composite insulator units are connected in series through the annular connecting fitting to form a flexible chain type structure, and a threaded telescopic mechanism is arranged in the second adjustable insulator section; the double-adjusting unit comprises an adjusting fitting with a multi-stage adjusting hole and a PT adjusting plate with a shielding ring; the three-section type composite insulator unit and the eight-split sub-conductor connecting unit disperse galloping stress by matching with a universal joint movable joint of the annular connecting fitting; the armor rod protects the surface of the wire, and the equipotential line eliminates suspended potential. The conductor galloping amplitude is reduced through the flexible structure and the double-adjusting mechanism, the bending resistance is improved through the oval reinforcing ribs, the electric field intensity is reduced through the shielding rings and the equipotential lines, the problems that a traditional spacer is insufficient in mechanical strength, poor in adjusting capacity and concentrated in electric field are solved, and the spacer is suitable for galloping resistance and safe operation of an extra-high voltage line.

Description

Technical Field

[0001] This invention relates to the field of phase-to-phase spacer technology, specifically a three-section dual-adjustable phase-to-phase spacer for 1000kV ultra-high voltage lines, which can effectively reduce conductor galloping. Background Technology

[0002] A phase spacer is a hardware component placed between two phase conductors to control the distance between them. A phase spacer typically consists of a sub-conductor spacer, a connecting plate, an insulator, and connecting hardware. When the conductors swing or gallop, the phase spacer installed on the conductors supports the two phase conductors, thus preventing phase-to-phase discharge due to excessively short distance between them and improving the safety of line operation. Traditional phase spacers use a rigid connection structure, which has the following problems:

[0003] Insufficient mechanical strength: Rigid connection hardware is prone to breakage under dynamic loads, especially in ultra-high voltage long-span sections where the conductor swings greatly and stress concentration in the hardware is significant.

[0004] Insufficient adjustment capability: The existing insulators have a fixed length and cannot adapt to the differences in phase spacing in different projects, resulting in poor installation adaptability.

[0005] Uneven electric field distribution: Corona discharge is prone to occur at the ends of connecting bolts, and floating potential is easily formed at the connection between the hardware and the conductor, which accelerates insulation aging.

[0006] Currently, phase-to-phase spacers are not used in 1000kV ultra-high voltage lines, and there is an urgent need for a new structure that combines high mechanical strength, adjustability, and electric field optimization. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a three-section dual-adjustable phase-to-phase spacer for 1000kV ultra-high voltage applications. Through a flexible chain structure, a dual-length adjustment mechanism, and an electric field shielding design, it effectively solves the problems of mechanical breakage, insufficient adjustment capability, and electric field concentration in traditional phase-to-phase spacers.

[0008] The technical solution adopted in this invention is:

[0009] A three-section, double-adjustable phase-to-phase spacer for 1000kV ultra-high voltage transmission lines is installed on the phase-to-phase conductors of ultra-high voltage lines. The three-section, double-adjustable phase-to-phase spacer comprises:

[0010] The three-section composite insulator unit includes a first insulator section, a second adjustable insulator section and a third insulator section. Each insulator section is connected in series with a second ring-shaped connecting hardware and a third ring-shaped connecting hardware to form a flexible chain structure. The second adjustable insulator section has a built-in threaded telescopic mechanism for adjusting the total length of the insulator according to the measured phase spacing.

[0011] Two symmetrically arranged eight-split sub-conductor connection units are fixed at both ends of the three-section composite insulator unit. Each connection unit includes a sub-conductor connection plate and an eight-split sub-conductor spacer. The sub-conductor connection plate is fixedly connected to the two side frames of the eight-split sub-conductor spacer by fixing bolts. The clamp of the eight-split sub-conductor spacer is provided with a rubber pad to clamp the conductor. The first insulator segment is connected to the sub-conductor connection plate of the first eight-split sub-conductor connection unit by a first annular connecting hardware.

[0012] The dual adjustment unit includes an adjustment fitting and a PT adjustment plate. One end of the adjustment fitting is connected to the third insulator segment via a fourth ring-shaped connecting fitting, and the other end is connected to the PT adjustment plate via a double bolt structure. The PT adjustment plate is connected to the sub-conductor connection plate of the second eight-split sub-conductor connection unit via fixing bolts. The connection plate of the PT adjustment plate is provided with a shielding ring to reduce the electric field strength at the bolt end.

[0013] The protective line is made of highly elastic silicone material and is used to cover the connection point of the eight-split sub-conductor spacer bar and the eight-split phase-interleaved conductor to protect the surface of the conductor.

[0014] An equipotential line is connected between the sub-conductor connecting plate of the first eight-split sub-conductor connecting unit and the first annular connecting hardware to eliminate floating potential.

[0015] Furthermore, the sub-conductor connecting plate is provided with a first elliptical reinforcing rib and a second elliptical reinforcing rib symmetrically distributed along the length direction to improve bending resistance; the elliptical reinforcing rib includes a short axis and a long axis, the short axis is perpendicular to the force direction of the sub-conductor connecting plate, and the long axis is arranged along the extension direction of the sub-conductor connecting plate.

[0016] Furthermore, the ring-shaped connecting hardware includes a movable joint with a universal joint structure, for each insulator segment of the eight-split conductor connection unit and the three-section composite insulator unit to deflect within a range of ±15°.

[0017] Furthermore, the adjusting hardware includes a side plate, a single plate, a parallel plate, double adjusting bolts, and double fastening bolts. The single plate is provided with multiple levels of adjusting holes. The single plate cooperates with the corresponding holes of the parallel plate through the double adjusting bolts to realize the multi-level adjustment of the installation length of the adjusting hardware.

[0018] Furthermore, the equipotential line is a multi-strand silver-plated copper stranded wire, and the two ends of the equipotential line are in elastic contact with the equipotential connection point of the sub-conductor connecting plate and the first annular connecting hardware through a spring contact finger structure.

[0019] The beneficial effects of this invention are:

[0020] This invention utilizes a flexible chain structure and a dual adjustment mechanism to disperse the energy of conductor galloping through elastic elements, effectively reducing the amplitude of conductor galloping.

[0021] This invention reduces mechanical stress and improves the fracture resistance of interphase spacers by combining elliptical reinforcing ribs with flexible connecting hardware.

[0022] This invention reduces the electric field strength and extends the service life of hardware by utilizing the combined action of the shielding ring of the PT adjustment plate and the equipotential line.

[0023] This invention combines a threaded telescopic mechanism with multi-stage adjustment holes in the adjusting hardware to achieve coarse and fine adjustment of the phase spacing of the phase spacers, reducing installation difficulty and adapting to different engineering needs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a three-section dual-adjustable phase-to-phase spacer structure for 1000kV ultra-high voltage applications according to the present invention.

[0025] Figure 2 This is a schematic diagram of the sub-conductor connection plate structure of a three-section double-adjustable phase-to-phase spacer for 1000kV ultra-high voltage transmission according to the present invention, wherein... Figure 2 a is the front view of the sub-wire connection plate. Figure 2 b is Figure 2 The left view of a;

[0026] Figure 3 This is a schematic diagram of the adjusting hardware structure of a three-section dual-adjustable phase-to-phase spacer for 1000kV ultra-high voltage applications according to the present invention. Figure 3 'a' is the main view of the adjustment fitting. Figure 3 b is Figure 3 Top view of a;

[0027] Among them, 1. Protective line, 2. Eight-split sub-conductor spacer bar, 3. Sub-conductor connecting plate, 4, 6, 8, 10. Connecting hardware, 5. First insulator section, 7. Second adjustable insulator, 9. Third insulator section, 11. Equipotential line, 12. Adjusting hardware, 13. PT adjusting plate, 301. Sub-conductor connecting plate body, 302. Connecting hole, 303. Weight reduction hole, 304. Limiting hole, 305. Fixing hole, 306. First elliptical reinforcing rib, 307. Second elliptical reinforcing rib, 1201. Adjusting hardware body, 1202. Side plate, 1203. Single plate, 1204. Parallel plate, 1205. Double adjusting bolt, 1206. Double fastening bolt. Detailed Implementation

[0028] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0029] In this invention, for ease of description, the relative positional relationships of each component are described according to the layout of the accompanying drawings. For example, the positional relationships of front, back, top, bottom, left, right, etc., are determined according to the layout direction of the accompanying drawings.

[0030] The present invention will be further described below with reference to embodiments and accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the scope of protection of the present invention.

[0031] Example 1

[0032] like Figure 1 As shown, a three-section double-adjustable phase-to-phase spacer for 1000kV ultra-high voltage is installed on the phase-to-phase conductors of an ultra-high voltage line. The three-section double-adjustable phase-to-phase spacer includes a three-section composite insulator unit, two eight-split conductor connection units, and a double-adjustment unit.

[0033] Assembly of the three-section composite insulator unit: The three-section composite insulator unit includes a first insulator section 5, a second adjustable insulator section 7, and a third insulator section 9. The insulator sections are connected in series to form a flexible chain structure through a second ring-shaped connecting hardware 6 and a third ring-shaped connecting hardware 8. The ring-shaped connecting hardware allows each insulator section to deflect within a range of ±15° through the movable joint of the universal joint structure, effectively preventing the insulator from twisting and deforming due to conductor galloping. By rotating the threaded telescopic mechanism built into the second adjustable insulator section 7, the total length of the insulator can be adjusted according to the actual phase spacing measured on site. The adjustment range is ±20%. After adjustment, it is fixed by locking nuts to ensure structural stability.

[0034] Installation of the eight-split sub-conductor connection unit: Each eight-split sub-conductor connection unit includes a sub-conductor connection plate 3 and an eight-split sub-conductor spacer 2. One end of each of the two eight-split sub-conductor spacers 2 is fixed to both ends of the three-section composite insulator unit via the sub-conductor connection plate 3, and the other end is fixed to the eight-split phase-to-phase conductors. The sub-conductor connection plate 3 is fixedly connected to the two side frames of the eight-split sub-conductor spacer 2 by fixing bolts. The clamps of the eight-split sub-conductor spacers 2 are equipped with rubber pads to clamp the conductors, and the rubber pads inside the clamps fit tightly. The surface of the conductor is evenly clamped by eight sub-conductors to avoid local stress concentration. The first insulator segment 5 is connected to the sub-conductor connecting plate 3 of the first eight-split sub-conductor connecting unit through the first ring-shaped connecting hardware 4. The third insulator segment 5 is connected to the sub-conductor connecting plate 3 of the second eight-split sub-conductor connecting unit through the fourth ring-shaped connecting hardware 10 and the double adjustment unit. The ring-shaped connecting hardware allows the eight-split sub-conductor connecting unit to deflect within ±15° through the movable joint of the universal joint structure, reducing the impact of conductor galloping on the eight-split sub-conductor spacer.

[0035] Assembly of the dual adjustment unit: The dual adjustment unit includes an adjustment fitting 12 and a PT adjustment plate 13. One end of the adjustment fitting 12 is connected to the third insulator segment 9 through a fourth ring-shaped connecting fitting 10, and the other end is connected to the PT adjustment plate 13 through a double bolt structure. The PT adjustment plate 13 is connected to the sub-conductor connection plate 3 of the second eight-split sub-conductor connection unit through fixing bolts. Shielding rings are installed on the two protruding connection plates of the PT adjustment plate 13. The shielding rings cover the bolt ends to reduce the electric field strength at the bolt ends and suppress corona discharge.

[0036] Installation of auxiliary components: The auxiliary components include protective lines 1 and equipotential lines 11. Protective lines 1 are installed at the eight connection points between the eight-split sub-conductor spacer 2 and the conductor. The protective lines 1 are made of high-elasticity silicone material to wrap the surface of the conductor, which effectively prevents conductor wear caused by wind vibration and friction, and at the same time reduces the mechanical impact of the phase spacer on the conductor. The equipotential lines 11, made of multi-strand silver-plated copper stranded wire, are elastically connected at both ends to the equipotential connection points of the sub-conductor connecting plate 3 and the first ring-shaped connecting hardware 4 through a spring contact finger structure, which can eliminate floating potential and avoid local electric field concentration.

[0037] like Figure 2 As shown, in the above embodiment, the upper part of the sub-conductor connecting plate body 301 is the stress concentration point. The connecting plate has an arc-shaped protrusion at this point to enhance the local tensile strength. The tolerance of the four connecting holes 302 on both sides of the sub-conductor connecting plate 301 and the eight-split sub-conductor spacer 2 is controlled within ±0.05mm to ensure that the four bolts of the connecting holes 302 are evenly stressed. The weight of the sub-conductor connecting plate 301 is reduced by the weight reduction hole 303. At the same time, the torsion of the eight-split sub-conductor spacer 2 is restricted by the limiting hole 304 to reduce the impact on the connecting holes 302. The sub-conductor connecting plate 301 is fixed to the PT adjustment plate by the double fixing bolts of the fixing hole 305. The sub-conductor connecting plate 301 is provided with a first elliptical reinforcing rib 306 and a second elliptical reinforcing rib 307. The elliptical reinforcing rib includes a short axis and a long axis. The short axis is perpendicular to the force direction, and the long axis is arranged along the extension direction of the connecting plate, which improves the bending resistance by 40%.

[0038] like Figure 3 As shown, in the above embodiment, the single plate 1203 of the adjusting hardware body 1201 is provided with multi-level adjusting holes. The single plate 1203 is engaged with the corresponding holes of the parallel plate 1204 by double adjusting bolts 1205 to realize multi-level adjustment of the installation length of the adjusting hardware 12. The adjusting hardware 12 is fixedly connected to the shielding ring of the PT adjusting plate 13 through the fixing holes on the side plate 1202. During installation, the adjusting hardware 12 is adjusted to keep the wire in a relaxed state, reducing the additional tension on the wire.

[0039] Example 2

[0040] The three-section dual-adjustable phase-to-phase spacer was assembled according to the structure described in Example 1 and tested in a high-wind section of a 1000kV UHV transmission line. The average wind speed in the high-wind section of the 1000kV UHV transmission line was 45m / s, the icing thickness was 10mm, and the conductor temperature was -5℃. One set of the three-section dual-adjustable phase-to-phase spacer of this invention and one set of traditional phase-to-phase spacers were installed at 1.5km intervals between each phase conductor, with three sets of each type of spacer installed. The initial phase-to-phase distance was 18m. The comparison of the flexible structure and adjustment function of the three-section dual-adjustable phase-to-phase spacer of this invention with that of the traditional phase-to-phase spacer is shown in Table 1.

[0041] Table 1. Comparison of performance between the phase spacer of the present invention and the conventional phase spacer.

[0042]

[0043] As can be seen from the above experiments, the three-section dual-adjustable phase-to-phase design of the present invention significantly improves the line's anti-galling capability and operational reliability through flexible structure, dual adjustment mechanism and electric field optimization design.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A three-section, double-adjustable phase-to-phase spacer for 1000kV ultra-high voltage transmission lines, installed on the phase-to-phase conductors of ultra-high voltage lines, characterized in that: The three-section dual-adjustable phase-to-phase spacer includes: The three-section composite insulator unit includes a first insulator section (5), a second adjustable insulator section (7) and a third insulator section (9). Each insulator section is connected in series to form a flexible chain structure through a second ring-shaped connecting hardware (6) and a third ring-shaped connecting hardware (8). The second adjustable insulator section (7) has a built-in threaded telescopic mechanism for adjusting the total length of the insulator according to the measured phase spacing. Two symmetrically arranged eight-split sub-conductor connection units are fixed at both ends of the three-section composite insulator unit. Each connection unit includes a sub-conductor connection plate (3) and an eight-split sub-conductor spacer (2). The sub-conductor connection plate (3) is fixedly connected to the two side frames of the eight-split sub-conductor spacer (2) by fixing bolts. The clamp of the eight-split sub-conductor spacer (2) is provided with a rubber pad to clamp the conductor. The first insulator segment (5) is connected to the sub-conductor connection plate (3) of the first eight-split sub-conductor connection unit by a first annular connecting hardware (4). The dual adjustment unit includes an adjustment fitting (12) and a PT adjustment plate (13). One end of the adjustment fitting (12) is connected to the third insulator segment (9) through a fourth ring-shaped connecting fitting (10), and the other end is connected to the PT adjustment plate (13) through a double bolt structure. The PT adjustment plate (13) is connected to the sub-conductor connection plate (3) of the second eight-split sub-conductor connection unit through a fixing bolt. The connection plate of the PT adjustment plate (13) is provided with a shielding ring to reduce the electric field strength at the bolt end. The protective line (1) is made of high elastic silicone material and is used to cover the connection point between the eight-split sub-conductor spacer (2) and the eight-split phase-to-phase conductor to protect the surface of the conductor; An equipotential line (11) is connected between the sub-wire connection plate (3) of the first eight-splitter sub-wire connection unit and the first annular connecting fitting (4) to eliminate floating potential.

2. The three-section dual-adjustable phase-to-phase spacer for 1000kV ultra-high voltage as described in claim 1, characterized in that: The sub-conductor connecting plate (3) is provided with a first elliptical reinforcing rib (306) and a second elliptical reinforcing rib (307) symmetrically distributed along the length direction to improve bending resistance; the elliptical reinforcing rib includes a short axis and a long axis, the short axis is perpendicular to the force direction of the sub-conductor connecting plate (3), and the long axis is arranged along the extension direction of the sub-conductor connecting plate (3).

3. A three-section dual-adjustable phase-to-phase spacer for 1000kV ultra-high voltage as described in claim 1, characterized in that: The ring-shaped connecting hardware includes a movable joint with a universal joint structure, which allows each insulator segment of the eight-split conductor connection unit and the three-section composite insulator unit to deflect within a range of ±15°.

4. A three-section dual-adjustable phase-to-phase spacer for 1000kV ultra-high voltage as described in claim 1, characterized in that: The adjusting hardware (12) includes a side plate (1202), a single plate (1203), a parallel plate (1204), double adjusting bolts (1205) and double fastening bolts (1206). The single plate (1203) is provided with multi-level adjusting holes. The single plate (1203) is engaged with the corresponding holes of the parallel plate (1204) by the double adjusting bolts (1205) to realize the multi-level adjustment of the installation length of the adjusting hardware (12).

5. A three-section dual-adjustable phase-to-phase spacer for 1000kV ultra-high voltage as described in claim 1, characterized in that: The equipotential line (11) is a multi-strand silver-plated copper stranded wire. The two ends of the equipotential line (11) are in elastic contact with the equipotential connection point of the sub-conductor connecting plate (3) and the first annular connecting hardware (4) through a spring contact finger structure.

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