Double-flexible excitation lead structure for rotor of 300Mvar phase modifier

Abstract

The utility model discloses a 300Mvar phase modifier rotor double-flexible excitation lead structure, which is integrally formed by a flexible connecting belt A, a self-locking fixing nail, a rigid bus, a flexible connecting belt B and an insulating belt, is integrally fixed in a lead groove of a rotor rotating shaft and is used for transmitting excitation current. The rotating speed of a 300Mvar phase modifier rotor reaches 3000 revolutions per minute, the rotating speed is high, the rotating centrifugal force is large, when a traditional rotor excitation lead structure is applied to the unit, the quality problems of lead deformation, abrasion and the like occur, and the safety and the stability of the unit are seriously influenced, the principle that flexible damping absorbs vibration, extrusion and tensile deformation is adopted, the flexibility is high, the follow-up performance is good, and the service life is long. Safe and stable operation can be ensured under high-speed rotation of 3000 revolutions per minute, and the quality problems of abnormal deformation, abrasion and the like of the lead are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of phase regulators, in particular to a double-flexible excitation lead structure of a 300Mvar phase regulator rotor. Background Art

[0002] The 300Mvar phase-shifting machine (PMSM) is a synchronous motor operating under special conditions and is the preferred reactive power compensation device for large power grids. Installing it in complex power grids can improve power system stability, effectively addressing risks such as local voltage instability and regional voltage collapse in modern power systems, and ensuring stable power supply. Currently, it has been widely used in my country's power transmission and transformation network. The traditional rotor excitation lead structure of this type of machine is composed of soft copper braided strips or multiple layers of soft copper sheets welded together through silver welding. However, due to the operating environment, operating conditions, and structural characteristics of this type of machine, under certain operating conditions, the rotor speed of this unit reaches 3000 revolutions per minute, resulting in high speed and large centrifugal force. During long-term high-speed operation, the traditional design leads are axially squeezed and stretched by centrifugal force, and the lead body is prone to quality problems such as local deformation, fracture, and weld cracking, seriously affecting the safety and stability of the product. Therefore, there is an urgent need to design a new excitation lead structure that can adapt to the structural characteristics of this type of unit, ensure long-term stable operation, and improve the overall safety of the unit. Utility Model Content

[0003] In view of this, the purpose of the utility model is to disclose a 300Mvar phase-shifting machine rotor double-flexible excitation lead structure that adopts the principle of double-flexible damping to absorb extrusion and tensile deformation, has high flexibility and good follow-up performance, can ensure safe and stable operation at a high-speed rotation of 3000 revolutions per minute, and does not have abnormal tensile deformation, breakage, cracking and other traditional structural quality problems. The technical solution of the utility model is: it consists of a flexible connecting belt A, a self-locking fixing nail, a rigid busbar, a flexible connecting belt B, and an insulating belt to form a whole. The rigid busbar is placed horizontally, and the flexible connecting belt A is welded to the rigid busbar from left to right to form a whole. The flexible connecting belt A is locked to the rigid busbar with a self-locking fixing nail, and the flexible connecting belt B is welded to the rigid busbar from right to left. The rigid busbar is tightly wrapped with an insulating belt to form a whole.

[0004] As a further solution of the present invention: the flexible connecting belt A is a multi-layer soft copper sheet laminated into a whole, which is in the shape of an inverted question mark after lamination, with the bottom solid section being sealed and welded as a whole, and the top solid section being sealed and welded as a whole.

[0005] As a further solution of the present invention: the rigid busbar is a copper busbar in an inverted L shape, the top left side of the rigid busbar has a welding opening that cooperates with the flexible connecting belt A, the right side of the rigid busbar has a welding step A that cooperates with the flexible connecting belt B, and the right side of the rigid busbar has a welding step B that cooperates with the flexible connecting belt B.

[0006] As a further solution of the present invention: the flexible connecting belt B is a multi-layer soft copper sheet laminated into a whole, which is in the form of staggered steps after lamination, and the solid section B on the left is sealed as a whole.

[0007] Compared with the prior art, the beneficial effects of the present invention are:

[0008] 1. The utility model adopts a two-flexible and one-rigid design structure. When the unit is running, the flexible connecting belt A on the far left can absorb the radial extrusion force caused by the high-speed rotating centrifugal force through its own elastic deformation, thereby reducing the tensile effect of the radial extrusion force on the entire structure; the rigid busbar provides sufficient rigid support for the entire structure, and is the force-bearing core area of ​​the flexible connecting belt A and the flexible connecting belt B. Its rigidity is sufficient to resist the pulling effect caused by the high-speed rotating centrifugal force, so that the axial tension of the entire structure is greatly reduced and always in a stable state, avoiding axial displacement, thereby ensuring the axial stability of the entire structure; the flexible connecting belt B can absorb the radial vibration caused by the high-speed rotating centrifugal force through its own flexible follow-up, thereby avoiding the upward transmission of vibration and improving the safety of the entire structure.

[0009] 2. After welding, the flexible connecting strip A and the rigid busbar are locked with self-locking fixing pins. The overall structure is more stable and can withstand deformation stably for a long time without abnormal deformation or breakage. There are welding steps A and welding steps B on the right side of the rigid busbar. When welding the rigid busbar and the flexible connecting strip B, welding steps A and welding steps B can greatly increase the remaining amount of silver solder, avoiding the problem of loose welding caused by silver solder flowing with gravity during high-temperature welding, greatly increasing the effective welding area, and at the same time, realizing flaw detection inspection of the welding area, improving welding quality and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a double flexible excitation lead structure for the rotor of a 300Mvar phase-shifting machine.

[0011] Figure 2 Detailed drawing of flexible connecting belt A.

[0012] Figure 3 Detailed drawing of rigid busbar.

[0013] Figure 4 Detailed drawing of flexible connecting belt B.

[0014] Figure 5 A schematic diagram is used for this structure.

[0015] Explanation of the marks in the figure: 1-flexible connecting belt A; 2-self-locking fixing nail; 3-rigid busbar; 4-flexible connecting belt B; 6-insulating belt; 7-top solid section; 8-bottom solid section; 9-left solid section B; 11-welding step B; 12-welding opening; 13-welding step A; 14-metal slot wedge; 15-rotating shaft; 16-connecting plate A; 17-connecting screw; 18-lead screw; 19-installation position of the utility model; 20-flexible section. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] It should be clarified that in the description of the present invention, terms indicating positional relationships or orientations such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", and "outside" are based on the positional relationships or orientations shown in the accompanying drawings. They are intended to facilitate the understanding of the present invention, and do not indicate or imply that the referred components must have a specific orientation or position, and be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0018] like Figure 1 As shown, a 300 Mvar phase-converter rotor double-flexible excitation lead structure is composed of a flexible connecting strip A1, a self-locking fixing nail 2, a rigid busbar 3, a flexible connecting strip B4, and an insulating tape 6. The rigid busbar 3 is placed horizontally. The flexible connecting strip A1 is welded to the rigid busbar 3 from left to right to form a whole. The flexible connecting strip A1 and the rigid busbar 3 are then locked with the self-locking fixing nail 2. The flexible connecting strip B4 is welded to the rigid busbar 3 from right to left. The rigid busbar 3 is tightly wrapped with the insulating tape 6 to form a whole.

[0019] like Figure 2 As shown, the flexible connecting belt A1 is a multi-layer soft copper sheet laminated into a whole, which is in the shape of an inverted question mark after lamination. The bottom solid section 8 is welded as a whole, and the top solid section 7 is welded as a whole. The flexible section 20 is located between the top solid section 7 and the bottom solid section 8. This design can maximize the integrity of the flexible connecting belt A1 while providing elastic deformation to absorb radial extrusion and tensile forces.

[0020] like Figure 3As shown, the rigid busbar 3 is a copper busbar in an inverted L shape. A welding opening 12 is provided at the top left side of the rigid busbar 3 to cooperate with the flexible connecting belt A1. A welding step A13 is provided on the right side of the rigid busbar 3 to cooperate with the flexible connecting belt B4. A welding step B11 is provided on the right side of the rigid busbar 3 to cooperate with the flexible connecting belt B4. The welding steps A13 and B11 can significantly increase the remaining amount of silver solder, avoid the problem of weak welding caused by the silver solder flowing with gravity during high-temperature welding, and significantly increase the effective welding area of ​​the rigid busbar 3 and the flexible connecting belt B4. At the same time, it can realize flaw detection inspection of the welding area, thereby improving welding quality and safety.

[0021] like Figure 4 As shown, the flexible connecting belt B4 is a multi-layer soft copper sheet laminated into a whole, which is in the form of staggered steps after lamination, and is integrally sealed at the solid section B9 on the left.

[0022] like Figure 5 As shown, the installation position 19 of the present invention is placed on the rotating shaft 15, and the upper part of the installation position 19 of the present invention is pressed by a metal slot wedge 14. The top left side of the installation position 19 of the present invention is welded to the connecting plate A16, and the lead screw 18 is used to tighten the installation position 19 of the present invention and the connecting screw 17 to complete the installation.

[0023] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A 300Mvar phase-shifting phase shifter rotor double flexible excitation lead structure, characterized by: The flexible connecting belt A (1), self-locking fixing nails (2), rigid busbar (3), flexible connecting belt B (4), and insulating belt (6) form a whole. The rigid busbar (3) is placed horizontally. The flexible connecting belt A (1) is welded to the rigid busbar (3) from left to right to form a whole. The flexible connecting belt A (1) and the rigid busbar (3) are locked with the self-locking fixing nails (2). The flexible connecting belt B (4) is welded to the rigid busbar (3) from right to left. The insulating belt (6) is tightly wrapped around the rigid busbar (3) to form a whole.

2. The 300Mvar phase-shifting phase shifter rotor dual-flexible excitation lead structure according to claim 1 is characterized by: The flexible connecting strip A (1) is a multi-layer soft copper sheet laminated into a whole, which is in the shape of an inverted question mark after lamination. The bottom solid section (8) is sealed and welded as a whole, and the top solid section (7) is sealed and welded as a whole.

3. The 300Mvar phase-shifting phase shifter rotor dual-flexible excitation lead structure according to claim 1 is characterized by: The rigid busbar (3) is a copper busbar in an inverted L shape. The top left side of the rigid busbar (3) has a welding opening (12) that cooperates with the flexible connecting strip A (1). The right side of the rigid busbar (3) has a welding step A (13) that cooperates with the flexible connecting strip B (4). The right side of the rigid busbar (3) has a welding step B (11) that cooperates with the flexible connecting strip B (4).

4. The 300Mvar phase-shifting phase shifter rotor dual-flexible excitation lead structure according to claim 1 is characterized by: The flexible connecting strip B (4) is a multi-layer soft copper sheet laminated into a whole, which is in the form of staggered steps after lamination, and is integrally sealed at the solid section B (9) on the left side.

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