A high-altitude simulation stator winding slot and end fixing device

Abstract

The utility model relates to a kind of simulation high-altitude stator winding slot part and end fixing device, and it relates to a kind of stator winding fixing device;To solve the problem of poor anti-clogging stability of existing test device winding.For the multiple of the simulation core fixing plate of the new type, and multiple simulation core fixing plate is stacked along the length direction of stator bar;Wherein, stator bar includes upper layer stator bar and lower layer stator bar;Through the screw rod, simulation core fixing plate is fixed;Simulation core fixing plate upper end is opened with stator core slot;Upper layer stator bar and lower layer stator bar are respectively set in stator core slot with the way of overlapping up and down;Layer interlayer pad is placed between upper layer stator bar and lower layer stator bar;Insulating box is lapped in the end of stator bar.It is beneficial to improve the stability of winding anti-clogging.

Description

Technical Field

[0001] This utility model relates to a stator winding fixing device. Background Technology

[0002] In recent years, with the increase in unit altitude, capacity, and voltage, as well as the enhancement of anti-corona detection methods, corona discharge at the winding ends frequently occurs in large hydroelectric and thermal power generating units. There has long been a lack of a universal simulation testing device to support simulation testing of the anti-corona structure at the winding ends. Due to the universality and complexity of testing devices, and the large number of departments required for their development, the development is very difficult. Existing testing devices cannot deeply analyze the mechanisms of end discharge and flashover during withstand voltage testing, and are more prone to flashover, burnout, and even bar damage due to excessively high voltage levels, significantly reducing the stability of the winding anti-corona system. Therefore, with the continuous improvement of the technical requirements for large power generation equipment, there is a lack of a universal simulation testing device for structural verification of the anti-corona structure at the winding ends. Utility Model Content

[0003] The purpose of this invention is to solve the problem of poor anti-corona stability of existing test devices windings, and to propose a device for simulating the slot and end fixing of stator windings at high altitudes.

[0004] The present invention provides a simulated high-altitude stator winding slot and end fixing device, which includes a simulated iron core fixing plate, a through-core screw, an interlayer spacer, and an insulating box.

[0005] The simulated core fixing plates are multiple, and the multiple simulated core fixing plates are stacked along the length direction of the stator bars; wherein, the stator bars include upper stator bars and lower stator bars;

[0006] The through-core screw fixes the simulated iron core fixing plate;

[0007] The upper end of the simulated iron core fixing plate has a stator iron core slot; the upper stator bars and the lower stator bars are respectively arranged in the stator iron core slot in an overlapping manner;

[0008] The interlayer spacer is placed between the upper stator bar and the lower stator bar;

[0009] The insulating box is attached to the end of the stator bar.

[0010] Furthermore, it also includes end clamps;

[0011] The end clamps include an upper end clamp and a lower end clamp; wherein, the upper end clamp fixes the ends of multiple upper stator bars together; and the lower end clamp fixes the ends of multiple lower stator bars together.

[0012] Furthermore, it also includes sleepers;

[0013] The length direction of the sleeper is the same as the length direction of the lower stator bar, and a fixing groove is provided at the bottom of the simulated iron core fixing plate;

[0014] The sleepers are placed in the fixing grooves.

[0015] Furthermore, the simulated iron core fixing plate is also provided with a through-bolt hole;

[0016] The through-hole screw passes through the through-hole screw hole and fixes the simulated iron core fixing plate through the through-hole screw hole.

[0017] Furthermore, it also includes interlayer spacers;

[0018] The interlayer spacer is disposed between the upper stator bar and the lower stator bar, and the interlayer spacer is located at the end of the lower stator bar.

[0019] Furthermore, the interlayer spacer is disposed within the stator core slot of the simulated core fixing plate.

[0020] Furthermore, the insulating box is filled with insulating curing adhesive; and the distance between the insulating box and the end of the stator bar insulation is not less than 50 mm.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] This novel stator winding slot and end fixing device for simulating high altitudes employs multiple simulated core fixing plates arranged at certain intervals. Adjacent simulated core fixing plates are fixed together using through-bolts, ultimately securing the stator bars via the stator core slots. Simultaneously, an insulating box is installed at the end of the stator bars to prevent high-potential creepage along the stator bar surface at the lead wires. Therefore, this fixing device not only fills a gap in the field of winding end fixing but also allows for in-depth analysis of the mechanisms of end discharge and flashover during withstand voltage testing. It effectively solves the current problems of flashover, burnout, and even bar damage caused by excessively high voltage levels during withstand voltage tests, significantly improving the stability of winding anti-corona. Furthermore, the development of this fixing device provides a platform for further experimental research on aspects such as safe discharge distance, overall dielectric loss and partial discharge, electric fields of upper and lower bar layers, and simulating real-world winding operation. It has broad application prospects and significant social and economic benefits. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of a simulated high-altitude stator winding slot and end fixing device as described in Specific Embodiment 1;

[0024] Figure 2This is a front structural diagram of a simulated high-altitude stator winding slot and end fixing device according to a specific embodiment one.

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of the simulated iron core fixing plate in Specific Implementation Method 1.

[0026] Among them, 1 is the simulated iron core fixing plate; 2 is the through bolt; 3 is the sleeper; 4 is the lower stator bar; 5 is the interlayer spacer; 6 is the upper stator bar; 7 is the end clamp; 8 is the interlayer spacer strip; 9 is the insulation box; 10 is the stator iron core slot; 11 is the through bolt hole; and 12 is the fixing slot. Detailed Implementation

[0027] Specific Implementation Method 1: Combination Figures 1 to 3 This embodiment describes a simulated high-altitude stator winding slot and end fixing device, which includes a simulated core fixing plate 1, a through-bolt 2, an interlayer spacer 5, and an insulation box 9.

[0028] The simulated iron core fixing plate 1 is multiple, and the multiple simulated iron core fixing plates 1 are stacked and arranged along the length direction of the stator bar; wherein, the stator bar includes an upper stator bar 6 and a lower stator bar 4;

[0029] The through-bolt 2 fixes the simulated iron core fixing plate 1; the through-bolt 2 is used to fix the simulated iron core fixing plate 1;

[0030] The simulated iron core fixing plate 1 has a stator iron core slot 10 at its upper end; the upper stator bar 6 and the lower stator bar 4 are respectively arranged in the stator iron core slot 10 in an overlapping manner;

[0031] The interlayer spacer 5 is placed between the upper stator bar 6 and the lower stator bar 4; the interlayer spacer 5 is used to prevent the upper stator bar 6 and the lower stator bar 4 from contacting each other;

[0032] The insulating box 9 is attached to the end of the stator bar.

[0033] In this embodiment, the simulated core fixing plate 1 is a rectangular plate structure and is made of stainless steel plate; or the simulated core fixing plate 1 can be replaced by other conductive metal materials, and a good grounding effect is guaranteed after the test wiring; the lower stator bar 4 is at the bottom of the stator core slot 10, and the upper stator bar 6 is at the top of the stator core slot 10. The upper stator bar 6 and the lower stator bar 4 are composed of the innermost copper conductor busbar and the insulating material wrapped around the copper wire. The stator core slot 10 limits and fixes the upper stator bar 6 and the lower stator bar 5 in the axial direction, and the interlayer spacer 5 separates the upper stator bar 6 and the lower stator bar 4 in the slot area. This involves arranging multiple simulated core fixing plates 1 at a certain distance and fixing adjacent simulated core fixing plates 1 together using through-bolts 2. Finally, the stator bars are fixed using stator core slots 10. At the same time, an insulating box 9 is set at the end of the stator bars to protect the metal leads after welding according to the drawings and prevent high potential creep along the surface of the stator bars at the end of the leads. Therefore, the fixing device can not only fill the gap in the winding end field, but also conduct in-depth analysis of the mechanism of end discharge and flashover during withstand voltage testing. It effectively solves the current situation of flashover, burnout, and even bar damage caused by excessively high voltage levels during withstand voltage testing, and greatly improves the stability of winding anti-corona.

[0034] Specific Implementation Method 2: This implementation method further defines the simulated high-altitude stator winding slot and end fixing device described in Specific Implementation Method 1. In this implementation method, it also includes an end clamp 7.

[0035] The end clamp 7 includes an upper end clamp and a lower end clamp; wherein, the upper end clamp fixes the ends of multiple upper stator bars 6 together; and the lower end clamp fixes the ends of multiple lower stator bars 4 together.

[0036] In this embodiment, the end clamp 7 is used to increase the fixing effect of the upper stator bar 6 and the lower stator bar 4, and plays a mechanical fixing role. It is an irregularly shaped part. The end clamp 7 is made of glass fiber tubing and fixed with binding rope that is impregnated with room temperature curing adhesive. Two fixation is made at the end of the stator bar, and room temperature insulating curing adhesive is injected into the end clamp 7 to enhance the fixing effect.

[0037] Specific Implementation Method 3: This implementation method further defines the simulated high-altitude stator winding slot and end fixing device described in Specific Implementation Method 1. In this implementation method, sleepers 3 are also included.

[0038] The length direction of the sleeper 3 is the same as that of the lower stator bar 4, and a fixing groove 12 is provided at the bottom end of the simulated iron core fixing plate 1; the sleeper 3 is placed in the fixing groove 12.

[0039] In this embodiment, the sleeper 3 supports multiple simulated iron core fixing plates 1 and limits the simulated iron core fixing plates 1; at the same time, the bottom surface of the sleeper 3 and the bottom surface of the simulated iron core fixing plates 1 are at the same horizontal height.

[0040] Specific Implementation Method 4: This implementation method further defines the simulated high-altitude stator winding slot and end fixing device described in Specific Implementation Method 1. In this implementation method, the simulated iron core fixing plate 1 is also provided with a through-bolt hole 11.

[0041] The through-hole screw 2 passes through the through-hole screw hole 11 and fixes the simulated iron core fixing plate 1 through the through-hole screw hole 11.

[0042] In this embodiment, by adding a through-hole 11, the through-hole 2 is fixed with flexibility.

[0043] Specific Implementation Method 5: This implementation method further defines the simulated high-altitude stator winding slot and end fixing device described in Specific Implementation Method 1. In this implementation method, it also includes interlayer spacer strips 8.

[0044] The interlayer spacer 8 is disposed between the upper stator bar 6 and the lower stator bar 4, and the interlayer spacer 8 is located at the end of the lower stator bar 4.

[0045] In this embodiment, an interlayer spacer 8 is added between the upper stator bar 6 and the lower stator bar 4. The interlayer spacer 8 is made of epoxy material, and its thickness can be adjusted according to the gap between the ends of the upper stator bar 6 and the lower stator bar 4 to fully fill the gap and separate the end areas of the upper stator bar 6 and the lower stator bar 4. As an alternative embodiment, the gap between the ends of the upper stator bar 6 and the lower stator bar 4 can also be filled with resin-impregnated polyester felt of different thicknesses.

[0046] Specific Implementation Method Six: This implementation method further defines the simulated high-altitude stator winding slot and end fixing device described in Specific Implementation Method One. In this implementation method, the interlayer pad 5 is disposed in the stator core slot 10 of the simulated core fixing plate 1.

[0047] In this embodiment, the specific location of the interlayer spacer 5 is defined. The function of the interlayer spacer 5 is to separate the upper stator bar 6 and the lower stator bar 4 in the groove area.

[0048] Specific Implementation Method Seven: This implementation method further defines the simulated high-altitude stator winding slot and end fixing device described in Specific Implementation Method One. In this implementation method, the insulating box 9 is filled with insulating curing adhesive; and the distance between the insulating box 9 and the insulating end of the stator bar is not less than 50 mm.

[0049] In this embodiment, room temperature insulating curing adhesive is poured into the insulating box 9 to prevent high potential creep along the surface of the stator bar lead and to enhance the anti-corona stability of the winding. The distance between the insulating box 9 and the end of the stator bar insulation is greater than or equal to 50 mm.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A high altitude simulation stator winding slot and end fixing device, characterized in that, It includes a simulated iron core fixing plate (1), a through bolt (2), an interlayer spacer (5), and an insulation box (9); There are multiple simulated core fixing plates (1), and the multiple simulated core fixing plates (1) are stacked along the length direction of the stator bars; wherein, the stator bars include upper stator bars (6) and lower stator bars (4). The through-core screw (2) fixes the simulated iron core fixing plate (1); The simulated iron core fixing plate (1) has a stator iron core slot (10) at its upper end; the upper stator bar (6) and the lower stator bar (4) are respectively arranged in the stator iron core slot (10) in an overlapping manner; The interlayer spacer (5) is placed between the upper stator bar (6) and the lower stator bar (4); The insulating box (9) is attached to the end of the stator bar.

2. A simulated high altitude stator winding slot and end section fixture as set forth in claim 1, wherein, It also includes end clamps (7); The end clamp (7) includes an upper end clamp and a lower end clamp; wherein, the upper end clamp fixes the ends of multiple upper stator bars (6) together; and the lower end clamp fixes the ends of multiple lower stator bars (4) together.

3. The device for simulating high-altitude stator winding slots and end fixing as described in claim 1, characterized in that, It also includes sleepers (3); The length direction of the sleeper (3) is the same as that of the lower stator bar (4), and a fixing groove (12) is provided at the bottom of the simulated iron core fixing plate (1); the sleeper (3) is set in the fixing groove (12).

4. The device for simulating high-altitude stator winding slots and end fixing as described in claim 1, characterized in that, The simulated iron core fixing plate (1) is also provided with a through-core screw hole (11). The through-hole screw (2) passes through the through-hole screw hole (11) and fixes the simulated iron core fixing plate (1) through the through-hole screw hole (11).

5. The device for simulating high-altitude stator winding slots and end fixing as described in claim 1, characterized in that, It also includes interlayer spacers (8); The interlayer spacer (8) is disposed between the upper stator bar (6) and the lower stator bar (4), and the interlayer spacer (8) is located at the end of the lower stator bar (4).

6. The device for simulating high-altitude stator winding slots and end fixing as described in claim 1, characterized in that, The interlayer spacer (5) is placed in the stator core slot (10) of the simulated core fixing plate (1).

7. The device for simulating high-altitude stator winding slots and end fixing as described in claim 1, characterized in that, The insulating box (9) is filled with insulating curing adhesive; and the distance between the insulating box (9) and the end of the stator bar insulation is not less than 50 mm.

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