Stator cable winding fixing method for power grid direct connection type ultrahigh-voltage superconducting phase modifier

Abstract

The invention belongs to the technical field of superconductive phase modifier stators, and relates to a power grid direct connection type ultrahigh voltage superconductive phase modifier stator cable winding fixing method, which is characterized in that a cable is fixed in a groove in segmented non-magnetic teeth, and the end part of the cable is bound and fixed; and the problem of local deformation of the cable winding caused by end electromagnetic stress and vibration can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of superconducting phase modifier stator, and particularly relates to a power grid direct connection type super-high voltage superconducting phase modifier stator cable winding fixing method. BACKGROUND

[0002] The stator winding is a key component of energy conversion and output power. The super-high voltage phase modifier winding is wound by a large number of cables of different sizes. The processing capacity in winding processing determines the maximum length of each cable, and the number of cable joints depends on the length of each cable. For a conventional phase modifier, the stator winding adopts a double-layer design, and the slot tooth is relatively short. The super-high voltage phase modifier adopts a multi-layer concentric winding design, and the stator is deeply slotted. When the super-high voltage cable is used to make the stator winding, the cable needs to be fixed between the cable and the slot wall. There is a circular hole at a certain distance in each slot, and a narrow waist is formed between the two circular holes, like a chain, and the circular arc of the side of the fixed cable is smaller, which causes the stator structure to be obviously different from the conventional phase modifier, and the end and slot fixing is different from that of the conventional phase modifier. SUMMARY

[0003] The purpose of the present application is to solve the technical problems in the background art. To this end, a power grid direct connection type super-high voltage superconducting phase modifier stator cable winding fixing method is provided.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: A power grid direct connection type super-high voltage superconducting phase modifier stator cable winding fixing method, comprising: Along the circumferential direction of the stator core, 8 cables are distributed adjacent to each other to form a phase winding, and 3 phase windings are arranged adjacent to each other in sequence, and each phase winding is S-shaped in whole length. Along the radial direction of the stator core, 6 turns of cables of each phase winding are arranged at intervals. Along the radial direction of the outer part of the stator core, the cable end part of the phase winding in the middle and the cable end part of the two phase windings on both sides thereof are arranged in each turn crossing manner.

[0005] The following is a further defined technical scheme of the present application. The cable of each phase winding is a whole cable without joint structure.

[0006] The following is a further defined technical scheme of the present application. The cable end part of each phase winding is wound and bound in 3 layers for multiple whole turns, and the outermost cable is bound and fixed with the end hoop circular ring.

[0007] The following is a further defined technical scheme of the present application. Insulating plates and conformable felt are used to tightly fix each layer between the overlapping parts of the cable end part of each phase winding.

[0008] Compared with the prior art, the present application has the following technical effects: The application can fix the cable in the slot of the segmented non-magnetic tooth, and also fix the end of the cable, so that the electromagnetic stress and vibration of the end of the cable can be avoided to cause the local deformation of the cable winding.

[0009] The application will be further described below in combination with the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0011] Figure 1 is a schematic diagram of a stator structure of the application; Figure 2 is a sectional view of the stator structure of the application. DETAILED DESCRIPTION

[0012] In order to make the above-mentioned objects, features and advantages of the application more apparent and easy to understand, the specific embodiments of the application will be described in detail below in combination with the drawings. In the following description, a large number of specific details are set forth in order to fully understand the application. However, the application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the application, so the application is not limited by the specific embodiments disclosed below.

[0013] The embodiment provides a stator cable winding fixing method of a power grid direct connection type ultra-high voltage superconducting phase modifier, which can be used in an ultra-high voltage superconducting phase modifier.

[0014] As shown in Figure 1 , the stator structure mainly comprises a stator pressure ring 1, a cable winding 2, an L-shaped support 3, an end hoop ring 4, a tooth-shaped support plate 5, a back iron 6, a stainless round steel 7 and an end binding belt. Along the radial direction of the stator, 15 tooth-shaped support plates 5 and 14 back irons 6 are alternately connected in sequence, the back iron 6 is provided with a radial ventilation channel, and two tooth-shaped support plates 5 are respectively arranged on both sides of the stator and are fixedly connected with the stator pressure ring 1 on both sides. The tooth-shaped support plate 5 is used as a tooth part and adopts a non-magnetic tooth. The back iron 6 is used as a yoke part and adopts a silicon steel sheet. The tooth-shaped support plate 5 is provided with a stator slot, and there are six turns in each slot. Specifically, the stator slot is composed of a group of round holes, adjacent round holes are connected by a narrow waist, and the widths of the narrow waists on both sides are different for the convenience of fixing the cable winding in the slot. Figure 2As shown, the tooth-shaped support plate 5 has a total of 15 segments, and the length of each tooth-shaped support plate 5 (in the axial direction of the stator) is 15 mm; the length of the radial ventilation channel (in the axial direction of the stator) is 7 mm, and the distance between adjacent tooth-shaped support plates 5 is 69 mm.

[0015] The stator pressure ring 1 on both sides of the stator is uniformly welded with 6 L-shaped supports 3 in the circumferential direction, and an end hoop ring 4 is welded on the L-shaped support 3 through a M30 nut or a diameter of 40 mm stainless steel 7.

[0016] Therefore, the electromagnetic scheme of the 15Mvar 35kV six-pole superconducting synchronous phase modifier this time locks the number of stator coil slots to be 144 slots, and the strand is six turns of cable winding in each slot. The number of parallel branches of the winding is 1. The cable winding is wound in a multi-layer concentric non-grouping manner. The cable is fixed in the slot in the segmented non-magnetic tooth, and the cable end is also bound and fixed, which can avoid the problem of local deformation of the cable winding caused by end electromagnetic stress and vibration.

[0017] The length of the non-magnetic tooth plus the radial ventilation channel accounts for 27% of the length of the core, that is, only 27% of the length of the core supports the cable in the slot, and the strength in the slot is not enough. Therefore, for the remaining 73%, each turn of each segment of the back iron 6 is respectively wound and bound with the adjacent turn of the cable through the glass fiber pipe belt with impregnated glass fiber, which can also be spliced with two pieces of insulating plate with the same slot shape as the non-magnetic tooth segment, avoiding the radial ventilation channel. The circular hole of each turn in the slot is filled with a mixture of polyester felt impregnated with adhesive or room temperature curing adhesive mixed with mica powder in a mass ratio of 1:1.3-1.7 epoxy putty at the wide part of the circular hole in the slot, to enhance the support strength in the length direction of the core.

[0018] Each phase of the super-high voltage cable winding is wound in a 3x8 concentric non-grouping manner. The high-voltage winding cable of the stator is arranged in a cross manner to avoid each other, and each phase needs to avoid the end cross of the other two phases at the same time. The cable of each phase winding is in the form of a whole root without joints, and is wound layer by layer from the inside to the outside in a concentric manner. Auxiliary roller sets and positioning tools are designed at both ends to facilitate cable traction and threading.

[0019] The cable end of each phase winding can be wrapped and bound with the glass fiber pipe belt with impregnated glass fiber, which is 8-shaped and 3-layered and is fixed by waist binding, and the outermost cable is bound and fixed with the end hoop ring 4. The end of the end binding belt is fixed with cyan acrylate instant adhesive. The insulating plate and the conformable felt after impregnation can be used to tightly fix the space between each layer of the overlapping cable end.

[0020] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Any person skilled in the art, without departing from the technical scheme of the present application, can make many possible changes and modifications to the technical scheme of the present application, or modify equivalent embodiments, by using the disclosed methods and technical contents. Therefore, any equivalent changes made according to the shape, structure and principle of the present application, without departing from the technical scheme of the present application, should be covered by the protection scope of the present application.

Claims

1. A method for fixing the stator cable winding of a grid-connected ultra-high voltage superconducting phase converter, characterized in that, include: Along the circumference of the stator core, eight turns of cable are distributed adjacently to form a phase winding. Three phase windings are arranged adjacently in sequence, and each phase winding is wound in an S-shape along its entire length. Along the radial direction inside the stator core, each phase winding consists of 6 turns of cable spaced at intervals. Along the radial direction outside the stator core, the cable end of the middle phase winding and the cable ends of the two phase windings on both sides are arranged in a cross-turn configuration.

2. The method for fixing the stator cable winding of a direct-connection ultra-high voltage superconducting phase converter as described in claim 1, characterized in that, The cable for each phase winding is a single, jointless structure.

3. The method for fixing the stator cable winding of a grid-connected ultra-high voltage superconducting camera as described in claim 1, characterized in that, The cable end of each phase winding is wrapped in three layers multiple times, and the outermost cable is tied and fixed to the end clamp ring.

4. The method for fixing the stator cable winding of a grid-connected ultra-high voltage superconducting camera as described in claim 1, characterized in that, At the cable ends of each phase winding, the overlapping sections are secured with insulating boards and conformal felt plugs between each layer.

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