阅读说明：本技术 一种高压发电机条式绕组vpi线棒的防电晕结构 (Corona-proof structure of high-voltage generator bar type winding VPI (voltage potential insulation) bar ) 是由 张越 刘尚斌 杜永平 于 2020-12-16 设计创作，主要内容包括：本发明涉及高压发电机技术领域,尤其涉及一种高压发电机条式绕组VPI线棒的防电晕结构,包括股间线棒、主绝缘层与防电晕层,防电晕层包覆在股间线棒的外部,主绝缘层包裹在股间线棒的外部,主绝缘层的外层通过半叠包裹有VPI低阻带,VPI低阻带的外层通过半叠包裹有VPI中阻带,VPI中阻带沿拐角延伸至弯曲段,位于弯曲段的VPI中阻带通过平包包裹有多胶云母带,多胶云母带通过半叠包裹有VPI高阻带并在末端延伸,VPI高阻带的外层通过半叠包裹有VPI保护带。本发明可以实现不同电阻值的有效过度,同时电阻带之间搭接部分合理,有效减少绝缘材料和防晕材料的用量,从而减轻整机重量。(The invention relates to the technical field of high-voltage generators, in particular to an anti-corona structure of a high-voltage generator bar type winding VPI (vacuum pressure insulated) bar, which comprises an inter-strand bar, a main insulating layer and an anti-corona layer, wherein the anti-corona layer is coated outside the inter-strand bar, the main insulating layer is coated outside the inter-strand bar, the outer layer of the main insulating layer is coated with a VPI low-stop band in a half-lap mode, the outer layer of the VPI low-stop band is coated with a VPI medium-stop band in a half-lap mode, the VPI medium-stop band extends to a bending section along a corner, the VPI medium-stop band positioned in the bending section is coated with a mica tape in a flat mode, the mica tape is coated with a VPI high-stop band in a half-lap mode and extends at the tail end. The invention can realize effective transition of different resistance values, simultaneously the lap joint parts between the resistance bands are reasonable, and the use amounts of insulating materials and corona-proof materials are effectively reduced, thereby reducing the weight of the whole machine.)

1. The utility model provides a high-voltage generator bar winding VPI line stick prevent corona structure, includes intertwist stick (1), main insulation layer (2) and prevents corona layer, prevents corona layer cladding in the outside of intertwist stick (1), its characterized in that: the utility model discloses a winding structure, including main insulating layer (2), stop band (5), many glue mica tape (5), stop band (6) and VPI protective tape (7), main insulating layer (2) parcel is in the outside of strand line stick (1), the outer of main insulating layer (2) has VPI low stop band (3) through half lap wrapping, the outer of VPI low stop band (3) has stop band (4) in through half lap wrapping, stop band (4) have VPI in VPI along corner extension to bending section in the VPI, be located bending section's VPI in stop band (4) have many glue mica tape (5) through flat wrapping, many glue mica tape (5) have VPI high stop band (6) and extend at end through half lap wrapping, the outer of VPI high stop band (6) has VPI protective tape (7) through half lap wrapping, the corona layer is by VPI low stop band (3), stop band (4) in the VPI, many glue mica tape (5), VPI.

2. The corona resistant construction of a high voltage generator bar winding VPI bar as claimed in claim 1, wherein: the VPI middle stop band (4) and the VPI low stop band (3) are overlapped by 20mm, and the total length of the middle stop band is 100 mm.

3. The corona resistant construction of a high voltage generator bar winding VPI bar as claimed in claim 2, wherein: the multi-glue mica tape (5) covers the whole VPI middle stop band (4), and the head end and the tail end of the multi-glue mica tape are consistent.

4. A corona resistant construction for a high voltage generator bar winding VPI bar as claimed in claim 3, wherein: the VPI high-resistance band (6) covers the whole glue-rich mica tape (5) and is extended by 120mm at the tail end.

5. The corona resistant construction of a high voltage generator bar winding VPI bar as claimed in claim 4, wherein: the VPI protection band (7) covers the whole VPI high resistance band (6), and the head end and the tail end of the VPI high resistance band are consistent.

6. The corona resistant construction of a high voltage generator bar winding VPI bar as claimed in claim 1, wherein: the intertwist bar (1) is formed by weaving, transposition and winding a plurality of copper wires.

Technical Field

The invention relates to the technical field of high-voltage generators, in particular to an anti-corona structure of a high-voltage generator bar type winding VPI (voltage potential insulation) bar.

Background

At present, with the increasing demand of electric power, the capacity and voltage grade of large-scale generator sets are greatly improved, the requirement on the reliability of the internal insulation structure of the generator is also improved, and a stricter requirement is provided for the insulation structure of the motor, particularly the corona resistance of the insulation structure of the motor. Research shows that when a high-voltage generator operates, electric fields of a motor stator winding at a ventilation notch and a linear slot outlet and at the end part of the winding are concentrated, when the local field intensity reaches a certain value, gas is locally ionized, blue fluorescence appears at the ionized part, namely, corona phenomenon appears, and local creepage phenomenon also appears, the corona generates ozone and nitrogen oxide to cause existence of hollow air gaps in an insulating layer, organic matters in the insulating layer are corroded and damaged, so that the local temperature in the coil rises to cause deterioration and carbonization of an adhesive, strand insulation and mica are whitened, the strand insulation and the mica are accumulated for a long time to further loosen and short circuit, insulation aging is accelerated, the service life of insulation is shortened, the corona phenomenon exists in a KV 6-grade motor, the corona phenomenon is more serious along with the increase of rated working voltage, and the corona phenomenon is possible to generate 'electric corrosion' without corona prevention treatment measures, resulting in damage to the insulation and adversely affecting the safe operation of the motor.

The main insulation of the VPI wire rod is generally made of epoxy little-glue mica material, and after the VPI wire rod is coated with the anti-corona layer, the whole wire rod is cured and molded by a VPI (vacuum pressure paint dipping process), so that gaps of air gaps in the whole wire rod are effectively reduced, the filling effect in a groove is improved, and the corona phenomenon can be effectively prevented. However, the wrapping and accumulation of the corona prevention layer at the end part of the high-voltage motor winding not only affects the paint dipping and curing effects between the corona prevention layers, but also is not beneficial to the heat dissipation of the end part, and causes certain influence on the safety of the motor. At present, the method needs to eliminate the air layer with small dielectric constant and low electric strength on the winding surface and to make the electric field distribution uniform, namely, a reasonable VPI bar corona-proof structure can effectively improve the voltage gradient of the coil end and eliminate the potential safety hazards such as corona, electric corrosion and the like.

There is therefore a need for a corona-proof construction for a high-voltage generator bar winding VPI bar which solves the above mentioned problems.

Disclosure of Invention

The invention provides an anti-corona structure of a high-voltage generator bar type winding VPI bar, aiming at solving the corona problem of the conventional high-voltage generator, and the anti-corona structure can be used for avoiding the phenomena of corona, electric corrosion and the like of the bar and has stable electrical performance.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an anti corona structure of high-voltage generator bar winding VPI line stick, includes interfemoral line stick, main insulating layer and anti corona layer, and anti corona layer cladding is in interfemoral line stick's outside, main insulating layer parcel is in interfemoral line stick's outside, the skin of main insulating layer has the low stop band of VPI through half lap wrapping, the skin of the low stop band of VPI has stop band in the VPI through half lap wrapping, stop band extends to the bending section along the corner in the VPI, and the stop band has the micrite area of gluing through flat wrapping in the VPI that is located the bending section, the micrite area of gluing has the VPI high stop band through half lap wrapping and extends at terminal, the skin of VPI high stop band has the VPI boundary tape through half lap wrapping, the anti corona layer comprises the low stop band of VPI, stop band in the VPI, the micrite area of gluing, VPI high stop band and VPI boundary tape.

Furthermore, the lap joint between the VPI middle stop band and the VPI low resistance band is 20mm, and the total length of the middle stop band is 100 mm.

Further, the multi-glue mica tape covers the whole stop band in the VPI, and the head end and the tail end of the multi-glue mica tape are consistent.

Further, the VPI high resistance tape covers the entire rich mica tape and extends 120mm at the end.

Further, the VPI protection band covers the whole VPI high-resistance band, and the head end and the tail end of the VPI high-resistance band are consistent.

Furthermore, the inter-strand wire rod is formed by weaving, transposition and winding a plurality of copper wires.

The invention has the advantages that: the invention provides an anti-corona structure of a high-voltage generator bar type winding VPI bar, which is bound by combining a VPI low-resistance band, a VPI middle-resistance band, a VPI high-resistance band and a VPI protective band, so that effective transition of different resistance values can be realized, meanwhile, the lap joint part between the resistance bands is reasonable, the consumption of insulating materials and anti-corona materials is effectively reduced, and the weight of the whole machine is reduced; meanwhile, the corona prevention structure can effectively prevent the occurrence of corona phenomenon of a 6 KV-16 KV high-voltage motor, and avoid the problem of shortened service life of a generator caused by winding rod corona and electric corrosion.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of the present invention.

Wherein:

1. an inter-strand wire rod; 2. A main insulating layer; 3. A VPI low stop band;

4. a stop band in VPI; 5. Glue-rich mica tapes; 6. A VPI high stopband;

7. VPI protective belt

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that unless otherwise explicitly specified or limited, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

FIG. 1 is a schematic structural diagram of the present invention, and the corona prevention structure of the high voltage generator bar type winding VPI bar shown in FIG. 1 comprises an inter-strand bar 1, a main insulation layer 2 and a corona prevention layer, wherein the corona prevention layer is coated outside the inter-strand bar 1, the main insulation layer 2 is coated outside the inter-strand bar 1, the outer layer of the main insulation layer 2 is semi-stack coated with a VPI low resistance tape 3, the outer layer of the VPI low resistance tape 3 is semi-stack coated with a VPI middle stop tape 4, the VPI middle stop tape 4 extends to a bending section along a corner, the VPI middle stop tape 4 at the bending section is flat coated with a multi-glue mica tape 5, the multi-glue mica tape 5 is semi-stack coated with a VPI middle resistance tape 6 and extends at the tail end, the outer layer of the VPI high resistance tape 6 is semi-stack coated with a VPI protective tape 7, and the corona prevention layer is composed of the VPI low resistance tape 3, the VPI middle resistance tape 4, the multi-glue mica tape 5, the VPI high-resistance band 6 and the VPI protective band 7 are formed, the inter-strand coil bar 1 sequentially wraps the main insulating layer 2, the VPI low-resistance band 3, the VPI middle stop band 4, the multi-glue mica band 5, the VPI high-resistance band 6 and the VPI protective band 7 to form an anti-corona structure, after the anti-corona structure is used, the whole anti-corona layer can be integrally wrapped by a polyester demolding band, the VPI middle stop band 4 and the VPI low-resistance band 3 are lapped by 20mm and have the total length of 100mm, the multi-glue mica band 5 covers the whole VPI middle stop band 4, the head end and the tail end of the multi-glue mica band are consistent, the VPI high-resistance band 6 covers the whole multi-glue mica band 5, the tail end of the multi-glue mica band is extended by 120mm, the VPI protective band 7 covers the whole VPI high-resistance band 6.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.