CN113726112B - Manufacturing method of stator bar with staggered corona-proof structure - Google Patents
Manufacturing method of stator bar with staggered corona-proof structure Download PDFInfo
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- CN113726112B CN113726112B CN202111194951.3A CN202111194951A CN113726112B CN 113726112 B CN113726112 B CN 113726112B CN 202111194951 A CN202111194951 A CN 202111194951A CN 113726112 B CN113726112 B CN 113726112B
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- silicon carbide
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- epoxy
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 44
- 239000010445 mica Substances 0.000 claims abstract description 36
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 14
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 39
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 37
- 239000004593 Epoxy Substances 0.000 claims description 27
- 238000004804 winding Methods 0.000 claims description 18
- 239000003292 glue Substances 0.000 claims description 15
- 239000001828 Gelatine Substances 0.000 claims description 12
- 229920000159 gelatin Polymers 0.000 claims description 12
- 239000011810 insulating material Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000003475 lamination Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims 1
- 230000002265 prevention Effects 0.000 abstract description 9
- 239000010410 layer Substances 0.000 abstract 3
- 239000002131 composite material Substances 0.000 abstract 1
- 239000011229 interlayer Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/10—Applying solid insulation to windings, stators or rotors, e.g. applying insulating tapes
- H02K15/105—Applying solid insulation to windings, stators or rotors, e.g. applying insulating tapes to the windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/30—Windings characterised by the insulating material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/38—Windings characterised by the shape, form or construction of the insulation around winding heads, equalising connectors, or connections thereto
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
The invention discloses a method for manufacturing a stator bar with a staggered corona-proof structure. The anti-corona structure of the stator bar is a laminated composite structure consisting of multiple layers of anti-corona materials and interlayer multi-rubber powder mica materials. The stator bar with the fault corona prevention structure has the advantages of simple corona prevention structure, convenient process and easy design and manufacture. The multi-rubber powder mica material is added between different anti-corona material layers, so that the multilayer anti-corona lap joint positions can be protected under the condition of improving the dielectric property of the coil bar, the bonding property of the anti-corona layers is enhanced, the uncontrollable conditions of the anti-corona layers and the resistance values of the anti-corona lap joints of the stator coil bar are avoided, and the stability of the anti-corona property of the stator coil bar is ensured.
Description
Technical Field
The invention relates to the field of generator stator bar, in particular to a manufacturing method of a stator bar with a staggered corona-proof structure.
Background
The anti-corona structure is one of the most important insulation structures of the stator bar of the generator, and the quality of the anti-corona performance has a decisive effect on the stable operation of the stator winding. The corona-proof material at the end part of the stator bar is usually a multilayer non-linear silicon carbide corona-proof material, the resistivity of the material is reversely changed with the electric field intensity, so that the electric field intensity at the end part of the bar can be gentle, and the highest electric field intensity at the end part can be effectively reduced.
The anti-corona structure generally adopts a multilayer anti-corona structure formed by sequentially binding different nonlinear silicon carbide anti-corona materials, and the different anti-corona materials are in direct contact at the lap joint. The traditional view points that different corona-proof materials are in direct contact with each other can ensure effective connection between the different corona-proof materials, so that the continuity of the potential distribution of the end part of the winding bar is better.
However, the direct contact of the different antihalation materials causes interpenetration during the curing of the materials, causing an uncontrolled variation of the resistance of the antihalation material and affecting the electric field distribution. Meanwhile, because the adhesion property of the corona-proof material is poor, the traditional corona-proof structure wire bar is easy to be bonded firmly or even to be unshelled inside after being formed, and the operation safety of the stator wire bar is influenced.
Disclosure of Invention
In view of the above, the invention aims to develop a method for manufacturing a stator bar with a staggered corona prevention structure, the stator bar has the advantages of simple corona prevention structure, convenient process and easiness in design and manufacture, the multilayer corona prevention lap joint positions can be protected under the condition of improving the dielectric property of the bar, the bonding property of the corona prevention layers is enhanced, the uncontrollable resistance of the corona prevention layers and the corona prevention lap joint positions of the stator bar is avoided, and the stability of the corona prevention performance of the stator bar is ensured. The technical scheme of the invention is as follows:
the method comprises the following steps: the high-resistance corona-proof structure of the stator bar consists of an epoxy multi-glue powder mica tape, a silicon carbide middle-resistance corona-proof tape and a silicon carbide high-resistance corona-proof tape, wherein the thickness of the epoxy multi-glue powder mica tape is 0.14mm, the glue content is 37-40%, and the volume resistivity is high>1012Omega.m, a silicon carbide middle-resistance anti-corona band thickness of 0.12mm, and an inherent surface resistivity of 1011～1012Omega, nonlinear coefficient of 0.5-1.0 cm/kV, silicon carbide high-resistance corona-proof band thickness of 0.12mm, and inherent resistivity of 1012～1013Omega, the nonlinear coefficient is 3-5 cm/kV;
step two: wrapping thickness d on the formed wire0The main insulating material is wrapped with a layer of low-resistance anti-corona material in a half-lap mode in a main insulating groove part, and the low-resistance anti-corona material is wrapped to a middle-low-resistance lap joint part;
step three: a layer of epoxy resin powder mica tape is wrapped on the low-resistance anti-corona material in a half lap winding way, and one side of the epoxy resin powder mica tape is covered with the low-resistance anti-corona material in the axial directionDistance d14cm, the other side is covered with main insulating material for an axial distance d1；
Step four: a layer of silicon carbide intermediate corona resistant tape is wrapped on the low-resistance corona resistant material and the epoxy multi-gelatine powder mica tape on the low-resistance corona resistant material in a semi-lap winding way, and the axial distance d of the epoxy multi-gelatine powder mica tape is covered2＝2cm；
Step five: wrapping a layer of epoxy multi-glue mica tape on the silicon carbide intermediate-resistance anti-corona tape in a semi-lap winding manner, and covering the silicon carbide intermediate-resistance anti-corona tape at one side by an axial distance d14cm, the other side is covered with main insulating material for an axial distance d1；
Step six: a layer of silicon carbide high-resistance anti-halation tape is wrapped in the silicon carbide middle-resistance anti-halation tape and the upper part of the epoxy multi-gelatine powder mica tape on the silicon carbide middle-resistance anti-halation tape in a semi-lap winding way, and the axial distance d of the epoxy multi-gelatine powder mica tape is covered2＝2cm；
Step seven: after the lamination of the anti-corona layer with the staggered structure is finished, the formed lead is heated, pressurized, solidified and formed on a die in an internal heating mode, the heating speed is 1.5 ℃/min, when the temperature of a winding bar reaches 170 +/-5 ℃, the power is cut off after heat preservation is carried out for 5h, and when the die is naturally cooled to below 50 ℃, the die is removed.
In the seventh step of the manufacturing method of the stator bar with the staggered corona-proof structure, the formed conducting wire is cured and formed in an internal heating mode.
In the seventh step of the manufacturing method of the stator bar with the staggered corona-proof structure, the temperature rise speed of the formed lead is 1.5 ℃/min.
In the seventh step, the mold is removed when the mold is naturally cooled to below 50 ℃.
The invention has the beneficial effects that:
the invention provides a method for manufacturing a stator bar with a staggered corona-proof structure, which can achieve the following technical effects through an innovative method:
1. and protecting the multi-stage anti-corona lap joint position. Epoxy mica materials with more excellent mechanical and electrical properties are added between different anti-corona material layers, so that the anti-corona lap joint position is prevented from being exposed outside, and the anti-corona lap joint position is effectively protected and prevented from being damaged by external machinery or discharge;
2. the bonding performance of the anti-corona lap joint of the stator bar is improved. The content of resin and glass fiber cloth between anti-corona layers is increased by the multi-rubber powder mica material, the bonding performance of anti-corona lap joint parts is improved, and the situations of weak anti-corona bonding and unshelling of the end parts of the stator bars are effectively prevented;
3. and the dielectric property of the stator bar is enhanced. The main insulation thickness of the end part of the wire rod is increased by the multi-rubber powder mica material, and the dielectric property is improved;
4. the effective connection of electrical performance is guaranteed. Although the physical connection of different anti-corona materials is blocked by the multi-rubber powder mica material, the capacitive resistance of the thinner multi-rubber powder mica material under the power frequency alternating current voltage is very small, so that the effective electrical connection between anti-corona material layers can be still ensured, and the anti-corona effect is not influenced.
Drawings
FIG. 1 is a schematic cross-sectional view of a stator bar in a fault-tolerant corona shielding configuration.
The notation in the figure is: 1-epoxy multi-glue mica tape, 2-silicon carbide middle resistance anti-corona tape, 3-silicon carbide high resistance anti-corona tape, 4-formed conductor, 5-main insulating material, 6-low resistance anti-corona material and 7-middle and low resistance lap joint
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
The method comprises the following steps: as shown in figure 1, the high-resistance corona-proof structure of the stator bar consists of an epoxy rich glue powder mica tape 1, a silicon carbide medium-resistance corona-proof tape 2 and a silicon carbide high-resistance corona-proof tape 3, wherein the thickness of the epoxy rich glue powder mica tape 1 is 0.14mm, the glue content is 37-40%, and the volume resistivity is high>1012Omega.m, a silicon carbide intermediate resistance corona band 2 with a thickness of 0.12mm and an inherent surface resistivity of 1011～1012Omega, nonlinear coefficient of 0.5-1.0 cm/kV, silicon carbide high-resistance anti-corona band 3 with thickness of 0.12mm and inherent resistivity of 1012～1013Omega, the nonlinear coefficient is 3-5 cm/kV;
step two: as shown in FIG. 1, inThe thickness d of the formed conductor 40The main insulating material 5 is wrapped with a layer of low-resistance corona-proof material 6 in a half-lap winding way in the main insulating groove part and is wrapped to a middle-low resistance lap joint part 7; the function of binding the main insulating material 5 in the step is to ensure the electrical strength and the mechanical strength of the stator bar, and the function of binding the low-resistance anti-corona material 6 in the step is to ensure the good grounding condition of the groove part of the stator bar.
Step three: as shown in figure 1, a layer of epoxy multi-glue mica tape 1 is wrapped on the low-resistance corona-proof material 6 in a half-lap winding way, and the low-resistance corona-proof material 6 is covered on one side by an axial distance d14cm, the other side is covered with a main insulating material 5 for an axial distance d1(ii) a The purpose of binding the epoxy resin mica tape 1 in the step is to protect the low-resistance corona-proof material 6 and enhance the bonding effect between corona-proof layers.
Step four: as shown in figure 1, a layer of silicon carbide middle anti-corona tape 2 is wrapped in a semi-lap winding way above the low-resistance anti-corona material 6 and the epoxy rich-gelatine powder mica tape 1 on the low-resistance anti-corona material, and the epoxy rich-gelatine powder mica tape 1 is covered by the silicon carbide middle anti-corona tape 2 at an axial distance d22 cm; in the step, a layer of epoxy rich-rubber mica tape 1 exists between the silicon carbide middle corona-resistant tape 2 and the low-resistance corona-resistant material 6, and because the epoxy rich-rubber mica tape 1 is very thin and has very small capacitive reactance, the influence on the current transmission between the silicon carbide middle corona-resistant tape 2 and the low-resistance corona-resistant material 6 is very small under the action of power frequency alternating current;
step five: as shown in figure 1, a layer of epoxy rich glue mica tape 1 is wrapped on a silicon carbide middle anti-corona tape 2 in a semi-lap winding way, and one side of the silicon carbide middle anti-corona tape 2 is covered by an axial distance d14cm, the other side is covered with a main insulating material 5 for an axial distance d1(ii) a The process and principle of the step three are similar.
Step six: as shown in figure 1, a layer of silicon carbide high-resistance anti-corona tape 3 is wrapped above the silicon carbide middle-resistance anti-corona tape 2 and the epoxy rich-gelatine powder mica tape 1 on the silicon carbide middle-resistance anti-corona tape in a semi-lap winding way, and the silicon carbide high-resistance anti-corona tape 1 is covered by the epoxy rich-gelatine powder mica tape 1 for an axial distance d22 cm; the process and principle of the step four are similar.
Step seven: after the lamination of the anti-corona layer with the staggered structure is finished, the formed lead 4 is heated, pressurized, solidified and formed on a die in an internal heating mode, the heating speed is 1.5 ℃/min, when the temperature of a winding bar reaches 170 +/-5 ℃, the power is cut off after heat preservation is carried out for 5h, and when the die is naturally cooled to below 50 ℃, the die is removed; the mode of unloading the die after natural cooling is adopted in the step, so that the residual stress in the stator bar is eliminated as much as possible, and the performance of the bar is improved.
Further, in the seventh step, the molded conducting wire (4) is cured and molded in an internal heating mode.
Further, in the seventh step, the temperature rise speed of the formed wire is 1.5 ℃/min.
Further, in the seventh step, the mould is unloaded when the mould is naturally cooled to below 50 ℃.
The present invention is illustrative only and not intended to limit the scope thereof, and those skilled in the art will be able to make modifications to the disclosed embodiments without departing from the spirit and scope of the present invention.
Claims (4)
1. A manufacturing method of a stator bar with a staggered corona-proof structure is characterized by comprising the following steps:
the method comprises the following steps: the high-resistance anti-corona structure of the stator bar consists of an epoxy rich-glue mica tape (1), a silicon carbide medium-resistance anti-corona tape (2) and a silicon carbide high-resistance anti-corona tape (3), wherein the thickness of the epoxy rich-glue mica tape (1) is 0.14mm, the glue content is 37-40%, and the volume resistivity is high>1012Omega.m, the thickness of the silicon carbide middle-resistance anti-corona band (2) is 0.12mm, and the inherent surface resistivity is 1011～1012Omega, the nonlinear coefficient is 0.5-1.0 cm/kV, the thickness of the silicon carbide high-resistance anti-corona band (3) is 0.12mm, and the inherent resistivity is 1012～1013Omega, the nonlinear coefficient is 3-5 cm/kV;
step two: the formed wire (4) is wrapped by a thickness d0The main insulating material (5) is wrapped with a layer of low-resistance corona-proof material (6) in a half-lap winding way in the main insulating groove part and is wrapped to a middle-low resistance lap joint part (7);
step three: a layer of epoxy multi-glue mica tape (1) is wrapped on the low-resistance corona-proof material (6) in a half-lap winding way, and the axial distance d of the low-resistance corona-proof material (6) is covered on one side14cm, the other side is covered with a main insulating material (5) for an axial distance d1；
Step four: a layer of silicon carbide middle anti-corona belt (2) is wrapped above the low-resistance anti-corona material (6) and the epoxy multi-gelatine powder mica tape (1) on the low-resistance anti-corona material in a half-lap winding way, and the epoxy multi-gelatine powder mica tape (1) is covered by the silicon carbide middle anti-corona belt (2) at an axial distance d2＝2cm；
Step five: wrapping a layer of epoxy multi-glue mica tape (1) on the silicon carbide middle-resistance anti-corona tape (2) in a semi-lap winding way, and covering the silicon carbide middle-resistance anti-corona tape (2) at one side by the axial distance d14cm, the other side is covered with a main insulating material (5) for an axial distance d1；
Step six: a layer of silicon carbide high-resistance anti-corona belt (3) is wrapped above the silicon carbide middle-resistance anti-corona belt (2) and the epoxy rich-gelatine powder mica tape (1) on the silicon carbide middle-resistance anti-corona belt in a semi-lap winding way, and the axial distance d of the epoxy rich-gelatine powder mica tape (1) is covered2＝2cm；
Step seven: after the lamination of the anti-corona layer with the staggered structure is finished, the forming lead (4) is heated, pressurized, cured and formed, and then the die is removed.
2. The method for manufacturing a stator bar with a staggered corona-proof structure as claimed in claim 1, wherein: and seventhly, curing and molding the molded lead (4) in an internal heating mode.
3. The method for manufacturing a stator bar with a laminated corona-proof structure as claimed in claim 1, wherein: in the seventh step, the temperature rise speed of the formed lead is 1.5 ℃/min.
4. The method for manufacturing a stator bar with a laminated corona-proof structure as claimed in claim 1, wherein: and seventhly, unloading the mold when the mold is naturally cooled to below 50 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111194951.3A CN113726112B (en) | 2021-10-14 | 2021-10-14 | Manufacturing method of stator bar with staggered corona-proof structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111194951.3A CN113726112B (en) | 2021-10-14 | 2021-10-14 | Manufacturing method of stator bar with staggered corona-proof structure |
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| Publication Number | Publication Date |
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| CN113726112A CN113726112A (en) | 2021-11-30 |
| CN113726112B true CN113726112B (en) | 2022-06-21 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201238225Y (en) * | 2008-06-27 | 2009-05-13 | 金群力 | Insulation structure of 10kV high-voltage variable-frequency motor |
| CN101577470A (en) * | 2009-06-12 | 2009-11-11 | 哈尔滨电机厂有限责任公司 | Manufacturing process of stator bar of turbo generator |
| JP2010074908A (en) * | 2008-09-17 | 2010-04-02 | Toshiba Corp | Stator coil and rotary electric machine |
| CN101951087A (en) * | 2010-09-15 | 2011-01-19 | 杨存高 | Method for manufacturing ground insulation layer of high-voltage motor stator coil, high-voltage motor stator coil and high-voltage motor |
| CN102158023A (en) * | 2011-05-18 | 2011-08-17 | 江苏冰城电材股份有限公司 | Method for manufacturing insulation structure of rotor coil of wind driven generator |
| JP2013505699A (en) * | 2009-09-16 | 2013-02-14 | シーメンス エナジー インコーポレイテッド | Tape structure having a conductive outer surface and an electrically insulating inner surface |
| CN103904806A (en) * | 2012-12-25 | 2014-07-02 | 中国长江动力集团有限公司 | 15.75 kV grade generator stator multi-gel mold pressing thinning optimization structure |
-
2021
- 2021-10-14 CN CN202111194951.3A patent/CN113726112B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201238225Y (en) * | 2008-06-27 | 2009-05-13 | 金群力 | Insulation structure of 10kV high-voltage variable-frequency motor |
| JP2010074908A (en) * | 2008-09-17 | 2010-04-02 | Toshiba Corp | Stator coil and rotary electric machine |
| CN101577470A (en) * | 2009-06-12 | 2009-11-11 | 哈尔滨电机厂有限责任公司 | Manufacturing process of stator bar of turbo generator |
| JP2013505699A (en) * | 2009-09-16 | 2013-02-14 | シーメンス エナジー インコーポレイテッド | Tape structure having a conductive outer surface and an electrically insulating inner surface |
| CN101951087A (en) * | 2010-09-15 | 2011-01-19 | 杨存高 | Method for manufacturing ground insulation layer of high-voltage motor stator coil, high-voltage motor stator coil and high-voltage motor |
| CN102158023A (en) * | 2011-05-18 | 2011-08-17 | 江苏冰城电材股份有限公司 | Method for manufacturing insulation structure of rotor coil of wind driven generator |
| CN103904806A (en) * | 2012-12-25 | 2014-07-02 | 中国长江动力集团有限公司 | 15.75 kV grade generator stator multi-gel mold pressing thinning optimization structure |
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| CN113726112A (en) | 2021-11-30 |
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