Insulating sleeve assembly for an ultrahigh voltage phase modifier

Abstract

The application discloses an insulating sleeve assembly of an ultrahigh-voltage phase modifier, which is used for the insulation of a nose end of a stator winding and comprises a first shell, a second shell, and a covering main body formed by the first shell and the second shell. The first shell and the second shell are in a T-shaped structure and can be jointed to form the covering main body. The covering main body comprises a first pipeline for covering a wire bar, a second pipeline for covering an insulating water pipe, and a third pipeline for covering a copper sleeve, and the first pipeline, the second pipeline and the third pipeline are communicated. The insulating sleeve assembly formed by the jointed first shell and second shell realizes the insulation of the nose end of the phase modifier, solves the problem of the nose end insulation under the compact space of the nose end of the ultrahigh-voltage multi-turn water-cooled phase modifier, and significantly improves the operation reliability of the nose end insulation of the stator winding.

Description

Technical Field

[0001] This invention relates to the field of stator insulation technology for ultra-high voltage synchronous condensers, and in particular to an insulation sleeve assembly for an ultra-high voltage synchronous condenser. Background Technology

[0002] To meet the reactive power compensation needs of new energy power plants, a 35kV direct-connect synchronous condenser was developed, overcoming the high-voltage insulation problem, eliminating the need for step-up transformers, and enabling the units to be directly connected to the 35kV power grid, thereby improving dynamic reactive power support capabilities and reducing construction and operation and maintenance costs.

[0003] The areas where the copper conductors or stainless steel open conductors at the ends of the upper and lower layers of stator bars are the locations of the hydroelectric or electrical connections between the bars, and are among the weakest areas of the stator winding insulation. Frequent phase advances, strong transient impacts, and large end leakage flux of the synchronous condenser significantly increase the insulation risk at the nose end compared to conventional generators. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes an insulating sleeve assembly for an ultra-high voltage synchronous condenser. The insulating sleeve assembly, composed of a first shell and a second shell spliced ​​together, achieves insulation at the nose end of the synchronous condenser, solving the problem of tight nose end insulation in ultra-high voltage multi-turn water-cooled synchronous condensers, and significantly improving the operational reliability of stator winding nose end insulation.

[0005] An insulating sleeve assembly for an ultra-high voltage synchronous condenser according to an embodiment of the present invention is used for insulation of the stator winding nose. The insulating sleeve assembly includes: a first housing, the first housing having a T-shaped structure; a second housing, the second housing having a T-shaped structure; the first housing and the second housing can be joined together to form a hollow encasing body; the encasing body includes: a first pipe encasing the conductor bar, a second pipe encasing the insulating water inlet pipe, and a third pipe encasing the copper sleeve, the first pipe, the second pipe, and the third pipe being interconnected.

[0006] According to some embodiments of the present invention, both the first housing and the second housing are molded from high-pressure vulcanized silicone rubber.

[0007] According to some embodiments of the present invention, a first splicing area is provided on the first housing, and a second splicing area is provided on the second housing, wherein the first splicing area and the second splicing area overlap each other.

[0008] According to some embodiments of the present invention, the widths of the first splicing area and the second splicing area are between 14 mm and 16 mm.

[0009] According to some embodiments of the present invention, the thickness of both the first shell and the second shell is L, and L satisfies the relationship: 2.2 mm ≤ L ≤ 2.8 mm.

[0010] According to some embodiments of the present invention, the first housing includes: a first pipe segment, a second pipe segment, and a third pipe segment, wherein the first pipe segment and the second pipe segment extend in the same direction, and the third pipe segment is connected between the first pipe segment and the second pipe segment; the second housing includes: a fourth pipe segment, a fifth pipe segment, and a sixth pipe segment, wherein the fourth pipe segment and the fifth pipe segment extend in the same direction, and the sixth pipe segment is connected between the fourth pipe segment and the fifth pipe segment; the first pipe segment and the fourth pipe segment form a first conduit covering the wire rod, the second pipe segment and the fifth pipe segment form a second conduit covering the insulating water inlet pipe, and the third pipe segment and the sixth pipe segment form a third conduit covering the copper sleeve.

[0011] According to some embodiments of the present invention, the second pipe segment includes: a first segment, a second segment, a third segment and a fourth segment connected in sequence, the first segment being connected to the third pipe segment, the first segment being used to cover the water box body, the second segment being used to cover the water box connector, the third segment being used to cover the nut of the insulating water inlet pipe, and the fourth segment being used to cover the sleeve of the insulating water inlet pipe.

[0012] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the installation of the insulating sleeve assembly according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the installation of the first housing according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the first housing according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the first housing according to an embodiment of the present invention.

[0014] Figure label: 1. Insulating sleeve assembly; 11. First housing; 111. First pipe section; 112. Second pipe section; 113. Third pipe section; 114. First segment; 115. Second segment; 116. Third segment; 117. Fourth segment; 12. Second housing; 121. Fourth pipe section; 122. Fifth pipe section; 123. Sixth pipe section; 2. Line bar; 21. Upper phase line bar; 22. Lower phase line bar; 3. Insulated water inlet pipe; 4. Copper sleeve; 5. Water box body; 6. Water box connector; 7. Nut; 8. Sleeve. Detailed Implementation

[0015] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0016] The following is for reference. Figures 1-4 The insulating sleeve assembly 1 of the ultra-high voltage synchronous condenser according to an embodiment of the present invention is described.

[0017] The insulating sleeve assembly 1 of the ultra-high voltage synchronous condenser in this embodiment of the invention is used for insulation of the stator winding nose. The insulation wrapping of the stator winding nose first involves wrapping a silicone rubber tape (with silicone rubber as the base material and impregnated with a heat-resistant resin with self-adhesive properties) as a base layer. The length of the silicone rubber tape wound on the wire bar 2 is at least 50 mm. After wrapping the silicone rubber tape, the double-layer insulating sleeve assembly 1 is wrapped. At least two of the following can be wrapped in sequence: silicone rubber tape, mica cloth, and mica tape.

[0018] Combination Figures 1-4 As shown, the insulating sleeve assembly 1 includes a first housing 11 and a second housing 12. The first housing 11 has a T-shaped structure, and the second housing 12 has a T-shaped structure. The first housing 11 and the second housing 12 can be non-perfectly symmetrical structures because the position of the copper sleeve 4 on the rod 2 is only in the center of the ordinary rod 2, the upper phase rod 21 is offset to the right, and the lower phase rod 22 is offset to the left. Therefore, the insulating sleeve assembly 1 is adjusted according to the position of the copper sleeve of different rods 2 to adapt to different rods 2.

[0019] The first shell 11 and the second shell 12 can be joined together to form a hollow encasing body. The encasing body consists of a first pipe encasing the rod 2, a second pipe encasing the insulating water inlet pipe 3, and a third pipe encasing the copper sleeve 4. The first, second, and third pipes are interconnected. Specifically, the third pipe is perpendicular to the first and second pipes. The opening direction of the first and second pipes is opposite to that of the second pipe, while the opening direction of the third pipe is perpendicular to both, adapting to the insulation at the connection point between the nose-end rod 2 and the copper sleeve 4 and the insulating water inlet pipe 3.

[0020] Thus, the insulation sleeve assembly 1, composed of the first housing 11 and the second housing 12 spliced ​​together, achieves insulation of the nose end of the synchronous condenser, solves the problem of tight nose end insulation in ultra-high voltage multi-turn water-cooled synchronous condenser, and significantly improves the operational reliability of the stator winding nose end insulation.

[0021] In some embodiments, the first housing 11 and the second housing 12 are molded from high-temperature vulcanized silicone rubber. The material of the first housing 11 and the second housing 12 can be high-temperature vulcanized silicone rubber (HTV). High-temperature vulcanized silicone rubber is soft and self-adhesive at room temperature, allowing the first housing 11 and the second housing 12 to fit tightly together after splicing. Silicone rubber has excellent properties such as high elasticity, corona resistance, and aging resistance, ensuring the stability of the insulating sleeve assembly 1.

[0022] The first housing 11 has a first splicing area, and the second housing 12 has a second splicing area. The first splicing area and the second splicing area overlap each other. Specifically, the first splicing area is provided on the edge of the first housing 11 facing the second housing 12, and the second splicing area is provided on the edge of the second housing 12 facing the first housing 11. The first splicing area and the second splicing area overlap each other so that the first housing 11 and the second housing 12 can be fitted together.

[0023] In some embodiments, the width of the first splicing area and the second splicing area is between 14 mm and 16 mm. For example, the width of the first splicing area and the second splicing area is 15 mm.

[0024] In some embodiments, the thickness of both the first housing 11 and the second housing 12 is L, where L satisfies the relationship: 2.2 mm ≤ L ≤ 2.8 mm. For example, the thickness of the first housing 11 and the second housing 12 can be 2.5 mm.

[0025] like Figure 2 and Figure 3 As shown, the first housing 11 includes a first pipe section 111, a second pipe section 112, and a third pipe section 113. The first pipe section 111 and the second pipe section 112 extend in the same direction, and the third pipe section 113 is connected between the first pipe section 111 and the second pipe section 112. The third pipe section 113 includes a first axial section and a first vertical section. The first axial section is connected between the first pipe section 111 and the second pipe section 112, and the axial direction of the first axial section is the same as that of the first pipe section 111 and the second pipe section 112. The first vertical section is perpendicular to the first axial section. The first axial section covers the crimping joint between the copper sleeve 4 and the wire rod 2, and the first vertical section covers the lead-out position of the copper sleeve 4, ensuring the insulation of the connection between the copper sleeve 4 and the wire rod 2.

[0026] like Figure 4 As shown, the second housing 12 includes a fourth pipe segment 121, a fifth pipe segment 122, and a sixth pipe segment 123. The fourth pipe segment 121 and the fifth pipe segment 122 extend in the same direction, and the sixth pipe segment 123 is connected between the fourth pipe segment 121 and the fifth pipe segment 122. The sixth pipe segment 123 includes a second axial segment and a second vertical segment. The second axial segment is connected between the fourth pipe segment 121 and the fifth pipe segment 122, and its axial direction is the same as that of the fourth pipe segment 121 and the fifth pipe segment 122. The first vertical segment is perpendicular to the second axial segment. The second axial segment covers the crimping joint between the copper sleeve 4 and the wire rod 2, and the second vertical segment covers the lead-out position of the copper sleeve 4, ensuring the insulation of the connection between the copper sleeve 4 and the wire rod 2.

[0027] Specifically, the first pipe segment 111 and the fourth pipe segment 121 form the first conduit covering the wire rod 2, the second pipe segment 112 and the fifth pipe segment 122 form the second conduit covering the insulated water pipe 3, and the third pipe segment 113 and the sixth pipe segment 123 form the third conduit covering the copper sleeve 4. The first conduit is formed by joining the first pipe segment 111 and the fourth pipe segment 121, the second conduit is formed by joining the second pipe segment 112 and the fifth pipe segment 122, and the third conduit is formed by joining the third pipe segment 113 and the sixth pipe segment 123.

[0028] like Figure 2 As shown, further, at the connection between the insulated water pipe 3 and the rod 2, a water box body 5, a water box connector 6, a nut 7, and a sleeve 8 are sequentially provided. The water box body 5 is connected to the rod 2, and the insulated water pipe 3 is connected to the water box connector 6 through the sleeve 8 and the nut 7. The second pipe section 112 includes: a first section 114, a second section 115, a third section 116, and a fourth section 117 connected in sequence. The first section 114 is connected to the third pipe section 113. The first section 114 is used to cover the water box body 5, the second section 115 is used to cover the water box connector 6, the third section 116 is used to cover the nut 7 of the insulated water pipe 3, and the fourth section 117 is used to cover the sleeve 8 of the insulated water pipe 3.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0031] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An insulating sleeve assembly for an ultra-high voltage synchronous condenser, used for insulation of the stator winding nose, characterized in that, include: The first housing (11) is a T-shaped structure; The second shell (12) is a T-shaped structure. The first shell (11) and the second shell (12) can be joined together to form a hollow enclosing body. The covering body includes: a first pipe covering the wire rod (2), a second pipe covering the insulating water pipe (3), and a third pipe covering the copper sleeve (4), wherein the first pipe, the second pipe, and the third pipe are connected to each other.

2. The insulating sleeve assembly of the ultra-high voltage synchronous condenser according to claim 1, characterized in that, Both the first housing (11) and the second housing (12) are made of high-pressure vulcanized silicone rubber by compression molding.

3. The insulating sleeve assembly of the ultra-high voltage synchronous condenser according to claim 1, characterized in that, The first housing (11) is provided with a first splicing area, and the second housing (12) is provided with a second splicing area, and the first splicing area and the second splicing area overlap each other.

4. The insulating sleeve assembly of the ultra-high voltage synchronous condenser according to claim 3, characterized in that, The widths of the first splicing area and the second splicing area are between 14 mm and 16 mm.

5. The insulating sleeve assembly of the ultra-high voltage synchronous condenser according to claim 1, characterized in that, The thickness of the first shell (11) and the second shell (12) is L, and L satisfies the relationship: 2.2 mm ≤ L ≤ 2.8 mm.

6. The insulating sleeve assembly of the ultra-high voltage synchronous condenser according to claim 1, characterized in that, The first housing (11) includes: a first pipe segment (111), a second pipe segment (112) and a third pipe segment (113), wherein the first pipe segment (111) and the second pipe segment (112) extend in the same direction, and the third pipe segment (113) is connected between the first pipe segment (111) and the second pipe segment (112); The second housing (12) includes: a fourth pipe segment (121), a fifth pipe segment (122) and a sixth pipe segment (123), wherein the fourth pipe segment (121) and the fifth pipe segment (122) extend in the same direction, and the sixth pipe segment (123) is connected between the fourth pipe segment (121) and the fifth pipe segment (122); The first pipe segment (111) and the fourth pipe segment (121) form a first pipe covering the wire rod (2), the second pipe segment (112) and the fifth pipe segment (122) form a second pipe covering the insulating water pipe (3), and the third pipe segment (113) and the sixth pipe segment (123) form a third pipe covering the copper sleeve (4).

7. The insulating sleeve assembly of the ultra-high voltage synchronous condenser according to claim 6, characterized in that, The second pipe section (112) includes: a first section (114), a second section (115), a third section (116) and a fourth section (117) connected in sequence. The first section (114) is connected to the third pipe section (113). The first section (114) is used to cover the water box body (5). The second section (115) is used to cover the water box connector (6). The third section (116) is used to cover the nut (7) of the insulating water inlet pipe (3). The fourth section (117) is used to cover the sleeve (8) of the insulating water inlet pipe (3).

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