A positioning ring fixing support structure of an ultrahigh pressure phase modifier

Abstract

The application relates to a positioning ring fixing support structure of an ultrahigh-pressure phase modifier, and belongs to the electrical engineering technical field of a stator of the ultrahigh-pressure phase modifier. The positioning ring fixing support structure comprises a base, an insulating support plate, a positioning ring one and a positioning ring two. The base is installed on a main water inlet and outlet pipe body pipe. The insulating support plate is connected with the base through fasteners. The insulating support plate has a double-fork structure. The top end of each fork is provided with an arc-shaped groove. The positioning ring one is arranged in the arc-shaped groove of one fork of the insulating support plate and is used for fixing an upper-layer insulating water guide pipe. The positioning ring two is arranged in the arc-shaped groove of the other fork of the insulating support plate and is used for fixing a lower-layer insulating water guide pipe. The base, the insulating support plate, the positioning ring one and the positioning ring two are matched and used for rigidly fixing the upper-layer and lower-layer insulating water guide pipes on the main water inlet and outlet pipe body pipe in a whole mode. The application is favorable for avoiding water joint cracking and water leakage caused by large stress and ensuring the safety and stability of a complex water route in the ultrahigh-pressure phase modifier in long-term operation.

Description

Technical Field

[0001] This invention relates to a positioning ring fixing support structure for ultra-high voltage synchronous condensers, used in 35kV ultra-high voltage synchronous condensers, and belongs to the field of stator electrical engineering technology for ultra-high voltage synchronous condensers. Background Technology

[0002] With the high proportion of renewable energy grid integration becoming a major trend in power system development, the short-circuit ratio and system inertia issues at renewable energy power plants are becoming increasingly prominent. Installing distributed synchronous condensers (SCDCs) on renewable energy collection lines to improve the short-circuit ratio and system inertia has become a recognized effective technical solution both domestically and internationally. Among these, 35kV direct-connected SCDCs can be directly integrated into renewable energy collection lines without the need for step-up transformers, significantly simplifying the system topology and further improving system inertia and short-circuit capacity. This plays a crucial role in ensuring the safe and stable operation of the new power grid and promoting the efficient consumption of renewable energy.

[0003] The synchronous condenser has a complex cooling water system. The insulated water inlet pipes, as a key component connecting the upper and lower coil bars to the main inlet and outlet water pipes, directly affect the long-term operational safety of the equipment. The positioning rings are crucial mechanical components for fixing and constraining the insulated water inlet pipes. By constraining, positioning, and supporting the insulated water inlet pipes, they ensure that they maintain their preset arrangement and spacing during operation, and rationally distribute stress and displacement. Insufficient fixing and support from the positioning rings may lead to abnormal wear, cracking, and other malfunctions in the insulated water inlet pipes, potentially causing serious accidents such as water leakage.

[0004] Currently, conventional positioning rings mostly employ a suspension and binding structure, which lacks rigid support and relies primarily on flexible binding for positioning. However, 35kV direct-connected synchronous condensers are directly connected to the power grid and must directly face complex operating conditions such as grid impacts, vibrations, and electromagnetic forces. Traditional positioning ring structures without rigid support cannot provide sufficient mechanical constraints and cannot effectively guide the insulated water pipe to form a reasonable stress distribution path. During long-term operation, significant stress concentrations easily occur at the insulated water pipe and water joints, leading to cracking and leakage at the water joints, seriously threatening the safe and stable operation of the complex internal water system of the synchronous condenser. Therefore, there is an urgent need for a fixed support structure that can provide reliable rigid support for the positioning ring and guide the insulated water pipe to form a flexible, low-stress pipe routing path. Summary of the Invention

[0005] The purpose of this invention is to provide a positioning ring fixing support structure suitable for 35kV grid-connected ultra-high voltage synchronous condensers, overcoming the shortcomings of existing suspension binding structures that lack rigid support and cannot effectively resist grid impacts. This structure rigidly fixes the insulated water inlet pipe to the main inlet and outlet water pipe body, guiding the insulated water inlet pipe to form a flexible and low-stress pipe routing path. This avoids large stresses at water joints, prevents cracking and leakage, and ensures the long-term safe and stable operation of the complex water circuit inside the synchronous condenser.

[0006] To achieve the above objectives, the present invention provides a positioning ring fixing support structure for an ultra-high voltage synchronous condenser, comprising a base, an insulating support plate, a positioning ring one, and a positioning ring two; the base is installed on the main inlet and outlet water pipe body; the insulating support plate is connected to the base by fasteners, and the insulating support plate has a double-forked structure, with an arc-shaped groove at the top of each fork; the positioning ring one is disposed in the arc-shaped groove of one fork of the insulating support plate for fixing the upper insulating water pipe; the positioning ring two is disposed in the arc-shaped groove of the other fork of the insulating support plate for fixing the lower insulating water pipe; the base, the insulating support plate, the positioning ring one, and the positioning ring two cooperate to rigidly fix the upper and lower insulating water pipes integrally to the main inlet and outlet water pipe body.

[0007] Preferably, the insulated water pipe is guided to form a flexible and low-stress pipe laying path.

[0008] Preferably, the base is a component with an arc surface, the curvature of which is adapted to the outer surface of the main inlet and outlet water pipe body. The base is rigidly fixed by being tightly attached to and welded to the main inlet and outlet water pipe body through its arc surface.

[0009] Preferably, the base is made of high-strength austenitic stainless steel.

[0010] Preferably, the hole connecting the insulating support plate to the base is an oblong hole, which allows the insulating support plate to be finely adjusted relative to the base during assembly.

[0011] Preferably, the base has a connection hole, the fastener is three M20 bolts, and the insulating support plate is connected to the base on one side by the three M20 bolts.

[0012] Preferably, the diameter of the arc-shaped groove is slightly larger than the outer diameter of the first positioning ring and the second positioning ring, and the arc-shaped groove is adapted to the outer contour of the first positioning ring and the second positioning ring to provide radial positioning constraint for the positioning ring.

[0013] Preferably, each fork of the insulating support plate has a binding through hole at an appropriate distance below the arc-shaped groove.

[0014] Preferably, polyester felt is wrapped around the contact area between the positioning ring one and the positioning ring two and the insulating support plate, with the polyester felt serving as a flexible buffer layer.

[0015] Preferably, the positioning ring one and the positioning ring two are cross-tied by a glue-impregnated binding rope inserted through the binding through hole, so that the positioning ring one and the positioning ring two are firmly constrained in the corresponding arc-shaped groove.

[0016] Compared with existing technologies, the present invention has the following advantages:

[0017] Compared with existing suspension and binding structures, this invention achieves integral rigid fixation of the positioning ring by welding the base to the main inlet and outlet water pipe. This provides sufficient mechanical strength for the 35kV direct-connected synchronous condenser to withstand the impact of the power grid and effectively guides the insulated water pipe to form a flexible and low-stress pipe laying path, thereby significantly reducing stress concentration at the water joint, preventing cracking and leakage, and ensuring the long-term safe and stable operation of the complex internal water circuit.

[0018] This invention employs a method of evenly distributing the insulated water pipes at six points along the entire circumference of the main inlet and outlet pipe, ensuring that the constraint and support forces of each phase insulated water pipes are evenly distributed along the circumference. This ensures that the insulated water pipes always maintain the preset arrangement and spacing in the circumferential direction, achieving force balance and reasonable stress distribution in each phase water path, and effectively avoiding local overload or abnormal wear.

[0019] The insulating support plate of this invention is connected to the base through a waist-shaped hole, which facilitates fine-tuning of the position during assembly and reduces the assembly difficulty caused by manufacturing and installation errors. The double-forked structure can provide independent support for the upper and lower positioning rings at the same time. Combined with the flexible protection of the polyester felt buffer layer and the cross binding and fixing of the dipped binding rope, a dual fixing mechanism combining physical limitation and flexible constraint is formed, which further improves the operational reliability of the structure and the convenience of on-site assembly. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the positioning ring fixing support structure of an ultra-high voltage synchronous condenser according to the present invention. Figure 2 This is a schematic diagram showing the connection between the insulating support plate and the base in the positioning ring fixing support structure of an ultra-high voltage synchronous condenser according to the present invention; Figure 3 This is a schematic diagram of the insulating support plate in the positioning ring fixing support structure of an ultra-high voltage synchronous condenser according to the present invention; Figure 4 This is a schematic diagram of the base in the positioning ring fixing support structure of an ultra-high voltage synchronous condenser according to the present invention; Figure 5 This is a partially enlarged structural diagram of the positioning ring fixing support structure of an ultra-high voltage synchronous condenser according to the present invention.

[0021] Attached reference numerals: 1. Positioning ring one; 2. Positioning ring two; 3. Base; 4. Insulating support plate; 5. Water pipe body; 6. Insulating water inlet pipe. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This invention discloses a positioning ring fixing support structure for ultra-high voltage synchronous condensers. This structure is applied to 35kV grid direct-connected ultra-high voltage synchronous condensers and is used to rigidly fix the insulated water inlet pipe 6, which connects to the upper and lower phase conductors, onto the main inlet / outlet water pipe body 5, thereby replacing the traditional suspension and binding structure and providing reliable support for the positioning ring. In terms of overall arrangement, this fixing support structure is located at the center between the upper and lower phase conductors of each phase, and is evenly distributed at six points around the main inlet / outlet water pipe body 5 to ensure that the insulated water inlet pipe 6 maintains a predetermined arrangement and spacing in the circumferential direction, thus ensuring balanced force on each phase water path.

[0024] The fixed support structure mainly consists of a base 3, an insulating support plate 4, a positioning ring 1, and a positioning ring 2. The base 3 is a high-strength austenitic stainless steel component with an arc surface. The curvature of this arc surface matches the outer surface of the main inlet / outlet water pipe 5, allowing the arc surface of the base 3 to fit tightly against the main inlet / outlet water pipe 5 and be rigidly fixed through integral welding. This fitting welding method significantly increases the contact area between the base 3 and the main inlet / outlet water pipe 5, thereby improving welding strength and structural stability. Simultaneously, the high-strength austenitic stainless steel material ensures that the base 3 possesses sufficient mechanical strength and corrosion resistance during long-term operation of the synchronous condenser. The base 3 has connection holes, and a single-sided connection is achieved through three M20 bolts to the insulating support plate 4. This connection method ensures sufficient mechanical connection strength and provides convenience for on-site assembly.

[0025] The insulating support plate 4, as a key insulating component connecting the base 3 and the positioning ring, has waist-shaped holes for connecting to the base 3. This waist-shaped hole design fully considers possible deviations during actual assembly, allowing for fine-tuning of the position of the insulating support plate 4 relative to the base 3 during assembly. This ensures that the positioning ring can be accurately aligned with the theoretical arrangement position of the insulating water pipe 6, avoiding assembly stress caused by manufacturing and installation errors. The insulating support plate 4 features a unique double-forked structure to simultaneously fix the two positioning rings at the ends. An arc-shaped groove is formed at the center apex of each fork, with a diameter slightly larger than the outer diameter of the positioning ring. This groove adapts to the outer contour of the positioning ring, providing a stable support surface and radial positioning constraint, preventing slippage or misalignment during operation. At an appropriate distance below each arc-shaped groove, the insulating support plate 4 also has through holes for binding. These through holes are used to thread adhesive-impregnated binding ropes to achieve a secure binding and fixation between the positioning ring and the insulating support plate 4.

[0026] Positioning ring 1 is used to fix the upper insulated water pipe 6, and positioning ring 2 is used to fix the lower insulated water pipe 6. The two positioning rings are placed at the two bifurcated grooves of the insulating support plate 4, respectively. To avoid wear caused by rigid direct contact between the positioning rings and the insulating support plate 4, polyester felt is wrapped around the entire circle at the contact point between the positioning rings and the insulating support plate 4. This polyester felt acts as a flexible buffer layer, protecting the outer surface of the positioning rings from damage and filling the contact gaps to make the load distribution more uniform. Subsequently, the positioning rings are cross-tied at the through holes below the two grooves of the insulating support plate 4 using glue-impregnated binding ropes, so that the positioning rings are firmly constrained within the arc-shaped grooves. This cross-tiing method, combined with the physical limitation of the grooves, forms a double fixation for the positioning rings, ensuring that they remain stable in position under the vibration of the synchronous condenser and the impact of the power grid.

[0027] In the cooperative relationship of the above components, the main inlet and outlet water pipe body 5 serves as the basic load-bearing component of the entire fixed support structure. The insulating support plate 4 is rigidly fixed to the center between its phases via the base 3. The insulating support plate 4 is bolted to the base 3 through a waist-shaped hole, making its position adjustable. Furthermore, its double-branched structure provides independent support platforms for the upper and lower positioning rings. The positioning rings are constrained in the arc-shaped groove of the insulating support plate 4 by a cross binding method using polyester felt buffer and glue-impregnated binding rope, ultimately achieving reliable fixation of the upper and lower insulating water pipes 6. The evenly distributed arrangement of six points around the circumference ensures that the water channel constraint and support forces of each phase insulating water pipe 6 are evenly distributed along the circumference, effectively guiding the insulating water pipes 6 to form a flexible and low-stress pipe laying path, thereby avoiding large stress at the water joints, preventing water joint cracking and leakage, and ensuring the safe and stable operation of the complex water circuit inside the 35kV direct-connected synchronous condenser during long-term operation.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A positioning ring fixing support structure for an ultra-high voltage synchronous condenser, characterized in that, The system includes a base, an insulating support plate, a first positioning ring, and a second positioning ring. The base is mounted on the main inlet / outlet water pipe. The insulating support plate is connected to the base via fasteners and has a double-forked structure, with an arc-shaped groove at the top of each fork. The first positioning ring is located in the arc-shaped groove of one fork of the insulating support plate and is used to fix the upper insulating water pipe. The second positioning ring is located in the arc-shaped groove of the other fork of the insulating support plate and is used to fix the lower insulating water pipe. The base, the insulating support plate, the first positioning ring, and the second positioning ring work together to rigidly fix the upper and lower insulating water pipes to the main inlet / outlet water pipe in a unified manner.

2. The positioning ring fixing support structure for ultra-high voltage synchronous condensers according to claim 1, characterized in that, Guide the insulated water pipe to form a flexible and low-stress pipe laying path.

3. The positioning ring fixing support structure for ultra-high voltage synchronous condensers according to claim 2, characterized in that, The base is a component with an arc surface. The curvature of the arc surface is adapted to the outer surface of the main inlet and outlet water pipe body. The base is rigidly fixed by tightly fitting and welding the arc surface to the main inlet and outlet water pipe body.

4. The positioning ring fixing support structure for ultra-high voltage synchronous condensers according to claim 1, characterized in that, The base is made of high-strength austenitic stainless steel.

5. The positioning ring fixing support structure for ultra-high voltage synchronous condensers according to claim 1, characterized in that, The hole connecting the insulating support plate to the base is an oblong hole, which allows the insulating support plate to be finely adjusted relative to the base during assembly.

6. The positioning ring fixing support structure for an ultra-high voltage synchronous condenser according to claim 1, characterized in that, The base has connection holes, and the fasteners are three M20 bolts. The insulating support plate is connected to the base on one side by the three M20 bolts.

7. The positioning ring fixing support structure for an ultra-high voltage synchronous condenser according to claim 1, characterized in that, The diameter of the arc-shaped groove is slightly larger than the outer diameter of the first positioning ring and the second positioning ring. The arc-shaped groove is adapted to the outer contour of the first positioning ring and the second positioning ring, providing radial positioning constraint for the positioning ring.

8. The positioning ring fixing support structure for ultra-high voltage synchronous condensers according to claim 1, characterized in that, At each fork of the insulating support plate, a binding through hole is provided at an appropriate distance below the arc-shaped groove.

9. The positioning ring fixing support structure for an ultra-high voltage synchronous condenser according to claim 1, characterized in that, The contact area between the positioning ring one and the positioning ring two and the insulating support plate is padded with polyester felt, which serves as a flexible buffer layer.

10. The positioning ring fixing support structure for an ultra-high voltage synchronous condenser according to claim 8, characterized in that, The positioning ring one and the positioning ring two are cross-tied by the glue-impregnated binding ropes inserted through the binding holes, so that the positioning ring one and the positioning ring two are firmly constrained in the corresponding arc-shaped grooves.

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