Voltage-withstanding insulation protection structure and method for branch wire rod of generator stator winding

Abstract

The invention relates to the technical field of insulation protection at the position of a generator stator winding, in particular to a voltage-withstanding insulation protection structure and method for a branch wire rod of the generator stator winding, and the structure comprises an upper plate, a middle plate and a lower plate which are mutually spliced to form an I-shaped structure. The stator winding branch wire rod comprises an A-phase wire rod and a B-phase wire rod which are arranged between the upper plate and the lower plate, and the middle plate passes through the space between the A-phase wire rod and the B-phase wire rod; the stator winding branch bar further comprises a C-phase bar located below the lower plate. The upper plate, the middle plate and the lower plate are arranged to form constraint cooperation on the A-phase bar, the B-phase bar and the C-phase bar, the voltage-resistant insulation requirements of the branch bars of the generator stator winding can be met, when the protection structure is arranged, the three-phase bars can keep the stability of the protection structure, the phenomenon that the upper plate, the middle plate and the lower plate fall off can be avoided, and the service life of the three-phase bar is prolonged. And the condition of insufficient insulation protection strength is also avoided, so that the safety and the reliability of the protection structure are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of insulation protection at the generator stator winding, and particularly relates to a voltage withstand insulation protection structure and method for the branch bars of the generator stator winding. Background Art

[0002] In the power system, the DC voltage withstand electrical test voltage of the generator stator winding is as high as twice the rated voltage. For the branches of the generator stator winding, the copper braid flexible connection between the equipment and the branch bars needs to be disconnected, and insulation protection devices need to be installed at the equipment break and the lead support assembly outlets where the ABC three-phase branches are separately led from a copper ring to ensure that the insulation spacing for the electrical test meets the requirements. At present, the insulation voltage withstand performance of ordinary insulation protection sleeves is not good, generally not meeting the insulation voltage withstand level requirements. For ordinary insulation protection partitions, the distance between the branch and the equipment break is relatively short, and it is difficult to place the branch bar protection partitions, or even impossible to place them. Since the ABC three-phase branches are arranged in a "pin" shape, the conventional insulation protection plates are not placed stably enough and are prone to falling from the placement position, posing potential safety hazards of falling from a height and injuring personnel and equipment. The conventional insulation protection plates also have the phenomenon of being broken down by high voltage.

[0003] It can be seen that there is an urgent need for improvement in the current insulation protection plates, and optimization and adjustment should be carried out to propose an insulation protection plate structure that can not only effectively insulate but also safely and stably insulate the branches. Therefore, a more reasonable technical solution needs to be proposed to solve the technical problems existing in the prior art. Summary of the Invention

[0004] The present invention proposes a voltage withstand insulation protection structure and method for the branch bars of the generator stator winding, which solves the problems proposed in the above background art that the insulation spacing of the ABC three-phase branches in the DC voltage withstand electrical test of the generator stator winding does not meet the requirements and the ordinary insulation protection is not placed stably, etc., ensuring the safety and high efficiency of the electrical test. The insulation protection device in the present invention has a simple structure, is a complete set as a whole, and is simple to process, which is beneficial to reducing the manual operation time and can greatly improve the work efficiency.

[0005] To achieve the above object, the protection structure disclosed by the present invention may adopt the following technical solutions:

[0006] A voltage withstand insulation protection structure for the branch bars of the generator stator winding, including an upper plate, a middle plate, and a lower plate that are spliced together to form an I-shaped structure. The stator winding branch bars include an A-phase bar and a B-phase bar disposed between the upper plate and the lower plate, and the middle plate passes through between the A-phase bar and the B-phase bar; the stator winding branch bars also include a C-phase bar located below the lower plate.

[0007] The above-disclosed voltage withstand insulation protection structure for the branch bars of the generator stator winding forms an I-shaped structure through the combination of the upper plate, the middle plate, and the lower plate. Corresponding to the A-phase bar, B-phase bar, and C-phase bar arranged in a "pin" shape, the left and right spaces inside the I-shaped structure cooperate with the A-phase bar and the B-phase bar respectively, and the lower surface of the lower plate cooperates with the C-phase bar. After the left and right spaces inside the I-shaped structure come into contact and cooperate with the A-phase bar and the B-phase bar, they can limit the I-shaped structure and prevent the I-shaped structure from falling; or after the lower plate comes into contact with the C-phase bar, it can prevent the I-shaped structure from falling, thus ensuring the stability of the I-shaped structure. Moreover, the I-shaped structure isolates the A-phase bar, B-phase bar, and C-phase bar. The upper plate, middle plate, and lower plate are all made of hard epoxy boards with a thickness of 10 mm, which can ensure sufficient insulation gaps.

[0008] Furthermore, when assembling the upper plate, middle plate, and lower plate, considering the accuracy and stability of the overall docking, various methods can be used to strengthen the alignment. Its structure is not uniquely defined. Here, an optimization is carried out and one feasible option is proposed: A upper plate groove is provided on the lower-facing surface of the upper plate, and a lower plate groove is provided on the upper-facing surface of the lower plate. The upper edge of the middle plate is embedded in the upper plate groove, and the lower edge of the middle plate is embedded in the lower plate groove. When adopting the above scheme, both the upper plate groove and the lower plate groove are straight groove structures, and the middle plate is clamped in for alignment and positioning.

[0009] Furthermore, various schemes can be adopted for the connection and fixation structure between the upper plate and the middle plate. Its structure is not uniquely defined. Here, an optimization is carried out and one feasible option is proposed: Two rows of corresponding upper plate holes are provided on the upper plate, and upper middle plate holes are correspondingly provided on the middle plate. The upper plate holes and the upper middle plate holes are fixed by connecting pieces. When adopting the above scheme, the connecting pieces pass through the upper plate holes and the upper middle plate holes, thereby realizing the connection and fixation between the upper plate and the middle plate.

[0010] Furthermore, various schemes can be adopted for the connection and fixation structure between the middle plate and the lower plate. Its structure is not uniquely defined. Here, an optimization is carried out and one feasible option is proposed: Two rows of corresponding lower plate holes are provided on the lower plate, and lower middle plate holes are correspondingly provided on the middle plate. The lower plate holes and the lower middle plate holes are fixed by connecting pieces. When adopting the above scheme, the connecting pieces pass through the lower plate holes and the lower middle plate holes, thereby realizing the connection and fixation between the lower plate and the middle plate.

[0011] Furthermore, the connecting piece is used to connect and fix the upper plate, middle plate, and lower plate. Various schemes can be adopted for the connecting piece. Its structure is not uniquely defined. Here, an optimization is carried out and one feasible option is proposed: The connecting piece includes an insulating connection belt. When adopting the above scheme, the insulating connection belt can be a plastic belt or a rubber belt.

[0012] Furthermore, in some solutions, other solutions can be used to achieve the connection and fixation of the upper plate, the middle plate and the lower plate. Here, one of the options is proposed: the upper plate and the lower plate are both provided with a plurality of connection holes, and the middle plate is provided with connection pins that correspond to the connection holes. When the above solution is adopted, the connection holes can be independently provided at intervals, or can be provided as continuous long holes, and the connection pin solution can be provided with a plurality of separate connection pins, or an integral connection pin can be provided to correspond to the long holes.

[0013] Furthermore, in order to maintain the stability of the upper plate, the middle plate and the lower plate when they are matched, the structure of the connection can be optimized, and the structure is not limited to a single one. Here, an optimization is made and one of the feasible options is proposed: a support rib structure is formed between the upper plate and the middle plate, and between the middle plate and the lower plate. When the above solution is adopted, the support rib structure can be fixed or integrally formed with the middle plate, or can be fixed and formed with the upper plate or the lower plate respectively.

[0014] Furthermore, when the A-phase wire rod, the B-phase wire rod and the C-phase wire rod are provided, the structure of the fixed connection can adopt multiple schemes, and the structure is not limited to a single one. Here, an optimization is made and one of the feasible options is proposed: the A-phase wire rod, the B-phase wire rod and the C-phase wire rod are provided with an insulating protective plate, and a plurality of protective plate fixing holes are provided on the insulating protective plate, and a fixed insulating belt is provided at the protective plate fixing hole. When the above scheme is adopted, the fixed insulating belt is passed through the protective plate fixing hole to bind the corresponding insulating protective plate and the wire rod tightly.

[0015] Furthermore, when setting up the protective structure, the relative position relationship between the lower plate, the upper plate and the corresponding wire rods should be maintained so as to keep the relative position stable after setting. This can be achieved through a variety of solutions, and one feasible option is proposed here: the lower plate and the upper plate are both provided with anti-deviation centering grooves, and the anti-deviation centering grooves correspond to the A-phase wire rod, the B-phase wire rod or the C-phase wire rod.

[0016] The above content discloses a withstand voltage insulation protection structure. The present invention also provides a corresponding insulation protection method as shown below:

[0017] A method for withstand voltage insulation protection of a branch line bar of a generator stator winding adopts the withstand voltage insulation protection device described above.

[0018] Compared with the prior art, some beneficial effects of the technical solution disclosed in the present invention include:

[0019] The present invention forms a constraint fit for the A-phase wire rod, the B-phase wire rod and the C-phase wire rod by setting an upper plate, a middle plate and a lower plate, so as to meet the voltage-resistant insulation requirements for the branch wire rods of the stator winding of the generator. When the protective structure is set, the three-phase wire rods correspond to the upper plate and the lower plate respectively, so as to maintain the stability of the protective structure, avoid the upper plate, the middle plate and the lower plate from falling off, and avoid the situation of insufficient insulation protection strength, thereby improving the safety and reliability of the protective structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic diagram of the overall protection structure.

[0022] Figure 2 Schematic diagram of the structure of the upper plate.

[0023] Figure 3 This is a schematic diagram of the structure of the middle plate.

[0024] Figure 4 This is a schematic diagram of the structure of the lower plate.

[0025] Figure 5 This is a schematic diagram of the structure at the branch line bar.

[0026] In the above drawings, the meanings of the symbols are as follows:

[0027] 1. Upper plate; 101. Upper plate hole; 102. Upper plate groove; 2. Lower plate; 201. Lower plate hole; 202. Lower plate groove; 3. Middle plate; 301. Upper middle plate hole; 302. Lower middle plate hole; 4. A phase wire rod; 5. B phase wire rod; 6. C phase wire rod; 7. Insulating protection plate; 701. Protection plate fixing hole; 8. Connector; 9. Fixing insulating tape. DETAILED DESCRIPTION

[0028] The present embodiment is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0029] In view of the poor insulation protection effect of the generator stator winding wire rod in the prior art, and the instability of the structure such as the protective plate, there is a safety hazard of falling. In the following embodiments, the branch wire rod includes an A-phase wire rod, a B-phase wire rod and a C-phase wire rod.

[0030] Example 1

[0031] like Figure 1 to Figure 5 As shown in the figure, this embodiment provides a voltage withstand insulation protection structure for the branch bars of a generator stator winding, which includes an upper plate, a middle plate, and a lower plate that are spliced together to form a工字-shaped structure. The stator winding branch bars include an A-phase bar and a B-phase bar disposed between the upper plate and the lower plate, and the middle plate passes through between the A-phase bar and the B-phase bar; the stator winding branch bars also include a C-phase bar located below the lower plate.

[0032] The voltage withstand insulation protection structure for the branch bars of the generator stator winding disclosed in this embodiment forms an工字-shaped structure through the combination of the upper plate, the middle plate, and the lower plate, corresponding to the A-phase bar, B-phase bar, and C-phase bar arranged in a "pin" shape. The left and right spaces within the工字-shaped structure cooperate with the A-phase bar and the B-phase bar respectively, and the lower surface of the lower plate cooperates with the C-phase bar. After the left and right spaces within the工字-shaped structure come into contact and cooperate with the A-phase bar and the B-phase bar, they can limit the工字-shaped structure and prevent it from falling; or after the lower plate comes into contact with the C-phase bar, it can prevent the工字-shaped structure from falling, thus ensuring the stability of the工字-shaped structure. Moreover, the工字-shaped structure isolates the A-phase bar, B-phase bar, and C-phase bar. The upper plate, middle plate, and lower plate are all made of hard epoxy boards with a thickness of 10 mm, which can ensure sufficient insulation gaps.

[0033] When assembling and docking the upper plate, middle plate, and lower plate, considering the accuracy and stability of the overall docking, various methods can be used to strengthen the alignment, and its structure is not uniquely limited. This embodiment is optimized and one feasible option is adopted: such as Figure 2 As shown in the figure, a upper plate groove is provided on the lower-facing surface of the upper plate, and a lower plate groove is provided on the upper-facing surface of the lower plate. The upper edge of the middle plate is embedded in the upper plate groove, and the lower edge of the middle plate is embedded in the lower plate groove. When adopting the above solution, both the upper plate groove and the lower plate groove are straight groove structures, and the middle plate is clamped in for alignment and positioning.

[0034] There are various options for the connection and fixation structure between the upper plate and the middle plate, and its structure is not uniquely limited. This embodiment is optimized and one feasible option is adopted: such as Figure 2 As shown in the figure, two rows of corresponding upper plate holes are provided on the upper plate, and upper middle plate holes are correspondingly provided on the middle plate. The upper plate holes and the upper middle plate holes are fixed by connecting pieces. When adopting the above solution, the connecting pieces pass through the upper plate holes and the upper middle plate holes, thereby realizing the connection and fixation between the upper plate and the middle plate.

[0035] There are various options for the connection and fixation structure between the middle plate and the lower plate, and its structure is not uniquely limited. This embodiment is optimized and one feasible option is adopted: such as Figure 4As shown, the lower plate is provided with two rows of corresponding lower plate holes, and the middle plate is provided with corresponding lower middle plate holes, and the lower plate holes and the lower middle plate holes are fixed by connecting pieces. When the above scheme is adopted, the connecting piece passes through the lower plate holes and the lower middle plate holes, thereby realizing the connection and fixation between the lower plate and the middle plate.

[0036] The connecting piece is used to connect and fix the upper plate, the middle plate and the lower plate. The connecting piece can adopt a variety of schemes, and its structure is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: Figure 1 As shown, the connecting piece includes an insulating connecting belt. When the above solution is adopted, the insulating connecting belt can be a plastic belt or a rubber belt.

[0037] When setting the A-phase wire rod, the B-phase wire rod and the C-phase wire rod, the structure of the fixed connection can adopt multiple schemes, and the structure is not limited to the only one. This embodiment optimizes and adopts one of the feasible options: the A-phase wire rod, the B-phase wire rod and the C-phase wire rod are provided with an insulating protective plate, and a plurality of protective plate fixing holes are provided on the insulating protective plate, and a fixed insulating belt is provided at the protective plate fixing hole. When the above scheme is adopted, the fixed insulating belt is passed through the protective plate fixing hole to tie the corresponding insulating protective plate and the wire rod tightly.

[0038] When setting up the protective structure, the relative position relationship between the lower plate, the upper plate and the corresponding wire rods should be maintained so as to keep the relative position stable after setting. This can be achieved through a variety of solutions. This embodiment adopts one of the feasible options: the lower plate and the upper plate are both provided with anti-deviation centering grooves, and the anti-deviation centering grooves correspond to the A-phase wire rod, the B-phase wire rod or the C-phase wire rod.

[0039] Example 2

[0040] This embodiment provides a voltage-resistant insulation protection structure for a branch wire bar of a generator stator winding, which is different from that in Embodiment 1 in the connection and matching structure of the upper plate, the middle plate and the lower plate.

[0041] Specifically, in this embodiment, other solutions can be used to achieve the connection and fixation of the upper plate, the middle plate and the lower plate. This embodiment adopts one of the options: the upper plate and the lower plate are both provided with a plurality of connection holes, and the middle plate is provided with connection pins (not shown in the drawings) that correspond to the connection holes. When the above solution is adopted, the connection holes can be independently provided at intervals, or can be provided as continuous long holes, and the connection pin solution can be provided with a plurality of separate connection pins, or an integral connection pin can be provided to correspond to the long holes.

[0042] Example 3

[0043] This embodiment provides a voltage-resistant insulation protection structure for a branch wire bar of a generator stator winding, which is different from that in Embodiment 1 in that it has a reinforced stabilizing structure at the connection points of the upper plate, the middle plate and the lower plate.

[0044] Specifically, in this embodiment, in order to maintain the stability of the upper plate, the middle plate and the lower plate when they are matched, the structure of the connection can be optimized, and the structure is not limited to a single one. This embodiment optimizes and adopts one of the feasible options: a support rib structure is formed between the upper plate and the middle plate, and between the middle plate and the lower plate (not shown in the drawings). When the above solution is adopted, the support rib structure can be fixed or integrally formed with the middle plate, or can be fixed and formed with the upper plate or fixed and formed with the lower plate respectively.

[0045] Example 4

[0046] The contents of the above embodiments 1 to 3 disclose the withstand voltage insulation protection structure. This embodiment provides the corresponding insulation protection method as shown below:

[0047] A method for high-voltage insulation protection of a generator stator winding branch bar adopts the high-voltage insulation protection structure described in any one of Embodiments 1 to 3.

[0048] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods under the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the protection scope of this embodiment. The protection scope of this embodiment should be based on the definition in the claims.

Claims

1. A voltage-resistant insulation protection structure for a branch wire bar of a generator stator winding, characterized in that: The invention comprises an upper plate (1), a middle plate (3) and a lower plate (2) which are spliced ​​to form an I-shaped structure, wherein the stator winding branch wire bars comprise an A-phase wire bar (4) and a B-phase wire bar (5) which are arranged between the upper plate (1) and the lower plate (2), and the middle plate (3) passes between the A-phase wire bar (4) and the B-phase wire bar (5); and the stator winding branch wire bars further comprise a C-phase wire bar (6) which is located below the lower plate (2).

2. The voltage-resistant insulation protection structure for the stator winding branch bar of the generator according to claim 1 is characterized in that: An upper plate groove (102) is provided on the downward side of the upper plate (1), a lower plate groove (202) is provided on the upward side of the lower plate (2), the upper edge of the middle plate (3) is embedded in the upper plate groove (102), and the lower edge of the middle plate (3) is embedded in the lower plate groove (202).

3. The voltage-resistant insulation protection structure for the stator winding branch bar of the generator according to claim 1 is characterized in that: The upper plate (1) is provided with two rows of upper plate holes (101) corresponding to each other, and the middle plate (3) is correspondingly provided with upper middle plate holes (301), and the upper plate holes (101) and the upper middle plate holes (301) are fixed by a connecting piece (8).

4. The voltage-resistant insulation protection structure for the stator winding branch bar of the generator according to claim 1 is characterized in that: The lower plate (2) is provided with two rows of one-to-one corresponding lower plate holes (201), and the middle plate (3) is correspondingly provided with lower middle plate holes (302), and the lower plate holes (201) and the lower middle plate (3) are fixed by a connecting piece (8).

5. The voltage-resistant insulation protection structure for the stator winding branch bar of the generator according to claim 3 or 4, characterized in that: The connecting piece (8) comprises an insulating connecting tape.

6. The voltage-resistant insulation protection structure for the stator winding branch bar of the generator according to claim 1 is characterized in that: The upper plate (1) and the lower plate (2) are both provided with a plurality of connection holes, and the middle plate (3) is provided with connection pins corresponding to the connection holes.

7. The voltage-resistant insulation protection structure for the stator winding branch bar of the generator according to any one of claims 1 to 5, characterized in that: A supporting rib structure is formed between the upper plate (1) and the middle plate (3), and between the middle plate (3) and the lower plate (2).

8. The voltage-resistant insulation protection structure for the stator winding branch bar of the generator according to claim 1 is characterized in that: The A-phase line bar (4), the B-phase line bar (5) and the C-phase line bar (6) are provided with an insulating protective plate (7), a plurality of protective plate fixing holes (701) are provided on the insulating protective plate (7), and a fixing insulating belt (9) is provided at the protective plate fixing holes (701).

9. The voltage-resistant insulation protection structure for the stator winding branch bar of the generator according to claim 1 is characterized in that: The lower plate (2) and the upper plate (1) are both provided with anti-deviation centering grooves, and the anti-deviation centering grooves are correspondingly matched with the A-phase wire rod (4), the B-phase wire rod (5) or the C-phase wire rod (6).

10. A method for withstand voltage insulation protection of a branch wire bar of a generator stator winding, characterized in that: A voltage-resistant insulating protection structure according to any one of claims 1 to 9 is adopted.

Images