CN111371269A - Manufacturing method of stator bar for improving winding corona voltage - Google Patents

Manufacturing method of stator bar for improving winding corona voltage Download PDF

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Publication number
CN111371269A
CN111371269A CN202010336278.1A CN202010336278A CN111371269A CN 111371269 A CN111371269 A CN 111371269A CN 202010336278 A CN202010336278 A CN 202010336278A CN 111371269 A CN111371269 A CN 111371269A
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corona
section
resistance
low
resistance anti
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CN111371269B (en
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孙永鑫
陶星明
范寿孝
冯超
陈阳
姜禹
李伟刚
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Harbin Electric Machinery Co Ltd
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Harbin Electric Machinery Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/10—Applying solid insulation to windings, stators or rotors
    • H02K15/105—Applying solid insulation to windings, stators or rotors 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/30—Reducing waste in manufacturing processes; Calculations of released waste quantities

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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 for improving winding corona voltage. The stator bar is added with the low-resistance layer in the end corona-proof structure, and compared with the traditional corona-proof structure, the stator bar can effectively reduce the surface potential of the end of the bar, further reduce the potential difference between winding bars and improve the corona-starting voltage level of the whole machine winding. The stator bar with the corona prevention structure has the characteristics of simple structure, convenience in manufacturing, remarkable effect and convenience in repairing, the corona onset voltage level of the end part of the winding can be greatly improved on the premise of not reducing the service life of the stator winding, and the running stability of the whole machine winding is improved.

Description

Manufacturing method of stator bar for improving winding corona voltage
Technical Field
The invention relates to the field of generator stator windings, in particular to a manufacturing method of a stator bar for improving winding corona voltage.
Background
The corona discharge phenomenon is easy to occur in the running process of a generator stator winding, the phenomenon can gradually corrode a main insulating material of a stator bar, a discharge channel is formed, an insulating hole is formed, insulation failure is caused in serious conditions, and great threat is generated to the running safety of a unit.
In the stator winding, the oblique edge gap between different phase bars in the same layer is small, the potential difference is large, the electric field in test and operation is large, and the weak part of corona discharge in the winding is formed. The stator wire rod end part of the traditional anti-corona structure adopts medium-resistance and high-resistance anti-corona materials, and the resistance values of the materials are high, so that the surface potential of the wire rod end part is high, and the potential difference between different phase wire rods is large. Meanwhile, because the design of the winding end is compact, the bevel edge gap is difficult to increase, so that the traditional anti-corona structure has great difficulty in adjusting the electric field of the bevel edge of the winding.
The internal electric field of the main insulation of the end part of the winding bar is lower, the inclined-edge electric field of the winding is higher, the novel corona-proof structure can be designed, the inclined-edge electric field of the end part of the winding is greatly reduced on the premise that the internal electric field of the main insulation is slightly improved and the service life of the stator bar is not influenced, and the running stability of the whole machine winding is comprehensively improved.
Disclosure of Invention
The invention aims to develop a stator bar for improving the winding corona inception voltage, and the stator bar is provided with a low-resistance layer in an end corona inception structure, compared with the traditional corona inception structure, the stator bar can effectively reduce the surface potential of the end of the bar, further reduce the potential difference between winding bars and improve the corona inception voltage level of the whole machine winding. The technical scheme of the invention is as follows:
a manufacturing method of a stator bar for improving winding corona voltage comprises the following steps:
1) the anti-corona structure at the end part of the stator wire rod sequentially comprises the following components from a stator iron core (1) to a lead (2): the corona-preventing structure comprises a first section of low-resistance corona-preventing structure (3), a second section of middle-resistance corona-preventing structure (4), a third section of low-resistance corona-preventing structure (5) and a fourth section of high-resistance corona-preventing structure (6); the outermost layer of the end part of the wire rod is covered with a section of additional insulation structure (7);
2) the anti-corona material of each anti-corona structure is as follows: the low-resistance anti-corona band material used for the first section low-resistance anti-corona structure (3) and the third section low-resistance anti-corona structure (5) has the width of 25mm, the thickness of 0.08mm and the surface resistivity of 10 under 500V direct-current voltage2Ω～103Omega; the middle resistance anti-corona band material used by the second section middle resistance anti-corona structure (4) has the width of 25mm, the thickness of 0.12mm and the surface resistivity of 1M omega-10 under 3000V direct current voltage3M omega; the high-resistance anti-corona belt material used by the fourth section of high-resistance anti-corona structure (6) has the width of 25mm, the thickness of 0.12mm and the surface resistivity of 10 under the direct-current voltage of 5000V3MΩ～105M omega; the width of the multi-adhesive mica tape material used for the main insulation and the outermost layer additional insulation structure (7) of the wire rod is 25mm, the thickness of the multi-adhesive mica tape material is 0.14mm, and the dielectric strength of the multi-adhesive mica tape material is more than or equal to 40 MV/m;
3) the position and length requirements of each anti-corona structure are as follows: the first section of low-resistance anti-corona structure (3) is positioned in a linear area (8) of a groove part of a bar and a partial initial end corner area (9), the lap joint position of the first section of low-resistance anti-corona structure (3) and the second section of anti-corona structure (4) is positioned in the initial end corner area (9) of the bar, and the lap joint position of the first section of low-resistance anti-corona structure (3) and the second section of anti-corona structure (4) is away from the axial surface of a stator core (1) by a distance L1Not less than 100 mm; the corona prevention structure (4) in the second section is located in a corner area (9) at the starting end of the winding bar, the lap joint position of the corona prevention structure (4) and the low-resistance structure (5) in the third section is located at the junction of the corner area (9) at the starting end of the winding bar and a straight line area (10) at the end part, and the axial surface length of the corona prevention structure (5) in the third section is as follows:
Figure BDA0002466722000000031
in the formula, L2The length of the anti-corona structure in the second section is as follows: cm; u shapeNRated voltage of the generator, unit: kV; the third section of low-resistance anti-corona structure (5) is positioned in a linear area (10) at the end part of the bar, and the length L of the third section of low-resistance anti-corona structure (5)3Straight line with endThe length of the region (10) is equal, and the lap joint position of the region (10) and the fourth section of high-resistance anti-corona structure (6) is at the junction of the linear region (10) at the end part of the linear rod and the tail end corner region (11); the fourth section of high-resistance anti-corona structure (6) is located in a corner area (11) at the tail end of the winding bar and a straight line area (12) at the tail end of the winding bar, the distance between the tail end of the fourth section of high-resistance anti-corona structure (6) and the plane of the pouring glue of the insulating box (13) is not less than 30mm, and the axial surface length of the fourth section of high-resistance anti-corona structure (6) is as follows:
L4≥UN
in the formula, L4The length of the fourth section of high-resistance anti-corona structure is as follows: cm;
4) the wrapping process flow and requirements of the stator bar are as follows: after the main insulating material of the mica tape is wrapped on the forming lead (2) in a half lap winding mode, wrapping a layer of low-resistance anti-corona tape on the first section of low-resistance anti-corona structure (3) and the third section of low-resistance anti-corona structure (5) in a half lap winding mode, wherein the anti-corona tapes are parallel and level at the closing positions on the two sides of the anti-corona tape; a layer of middle anti-corona material is bound by the middle anti-corona structure (4) in the second section in a half lap winding mode, and the lap joint distance d between the middle anti-corona structure and the first section of low-resistance anti-corona structure (3) and the lap joint distance d between the middle anti-corona structure and the third section of low-resistance anti-corona structure (5) are both 20 mm; a layer of high-resistance anti-corona material is bound on the fourth section of high-resistance anti-corona structure (6) in a half lap winding mode, and the lap joint distance d between the fourth section of high-resistance anti-corona structure and the third section of low-resistance anti-corona structure (5) is 20 mm; an insulation structure (7) is added on the outermost layer of the end part of the wire rod, three layers of multi-glue mica tape materials are bound in a half lap winding mode, and the lap joint distance d covering the second section middle anti-corona structure (4) and the fourth section high-resistance anti-corona structure (6) is 20 mm;
5) after the main insulating material, the corona-proof material and the additional insulating material are wrapped, the unformed winding bar is placed in a hot-pressing die, a lead is connected with a large current for heating, the heating rate is kept to be 1-2 ℃/min, when the temperature reaches 170-180 ℃, the current is regulated to keep the temperature of the winding bar constant, the power is cut off after the temperature is kept for 6h, and when the die is naturally cooled to be below 60 ℃, the die is removed.
Technical effects
The novel corona prevention structure is creatively provided by using the corona prevention material with lower resistance at the end part of the stator bar, the surface potential at the end part of the bar is reduced by 30 percent under the condition of not influencing the main insulation operation life of the bar, the corona voltage level of the winding is improved by 40 percent, the corona voltage level of the generator winding is greatly improved, the corona condition of the generator winding is improved, the corona prevention structure is a leap of the corona prevention design of the generator stator bar, and has an important role in thoroughly solving the corona discharge problem of the generator stator winding.
Meanwhile, the winding end part is also a part which is easy to damage, compared with the traditional high-resistance corona-proof material, the low-resistance corona-proof material has smaller and stable resistance range, is easier to replace and repair, has simpler repair method and implementation process, better effect after repair than the traditional coil bar, is not easy to cause the problems of subsequent corona discharge and the like, and is a corona-proof structure with convenient repair.
Drawings
FIG. 1: anti-corona structural schematic diagram of stator bar for improving winding corona voltage
FIG. 2: stator bar basic geometry schematic
Detailed Description
1) As shown in fig. 1, the anti-corona structure at the end of the stator bar sequentially comprises, from the stator core 1 to the lead 2: a first section of low-resistance anti-corona structure 3, a second section of middle-resistance anti-corona structure 4, a third section of low-resistance anti-corona structure 5 and a fourth section of high-resistance anti-corona structure 6; the outermost layer of the end part of the wire rod is covered with a section of additional insulating structure 7;
2) as shown in fig. 1, the anti-corona material of each anti-corona structure is: the low-resistance anti-corona band material used for the first section of low-resistance anti-corona structure 3 and the third section of low-resistance anti-corona structure 5 has the width of 25mm, the thickness of 0.08mm and the surface resistivity of 10 under 500V direct-current voltage2Ω～103Omega; the middle resistance anti-corona belt material used by the middle resistance anti-corona structure 4 of the second section has the width of 25mm, the thickness of 0.12mm and the surface resistivity of 1M omega-10 under 3000V direct current voltage3M omega; the high-resistance anti-corona belt material used by the fourth section of high-resistance anti-corona structure 6 has the width of 25mm, the thickness of 0.12mm and the surface resistivity of 10 under the direct-current voltage of 5000V3MΩ～105M omega; the width of the multi-glue mica tape material used by the main insulation and the outermost layer additional insulation structure 7 of the wire rod is 25mm, the thickness of the multi-glue mica tape material is 0.14mm, and the dielectric strength of the multi-glue mica tape material is more than or equal to 40 MV/m;
3) as shown in fig. 1 and 2, the position and length of each segment of the anti-corona structure are required as follows: the first section of low-resistance anti-corona structure 3 is positioned in a linear area 8 and a partial initial end corner area 9 of a slot part of a bar, the lap joint position of the first section of low-resistance anti-corona structure 3 and the anti-corona structure 4 in the second section is positioned in the initial end corner area 9 of the bar, and the lap joint position of the first section of low-resistance anti-corona structure 3 and the anti-corona structure 4 in the second section is positioned at a distance L from the axial surface of the stator core 11Not less than 100 mm; the corona prevention structure 4 in the second section is located in a corner area 9 at the starting end of the winding bar, the lap joint position of the corona prevention structure 4 in the second section and the low-resistance corona prevention structure 5 in the third section is at the junction of the corner area 9 at the starting end of the winding bar and a straight area 10 at the end part, and the axial surface length of the low-resistance corona prevention structure 5 in the third section is as follows:
Figure BDA0002466722000000051
in the formula, L2The length of the anti-corona structure in the second section is as follows: cm; u shapeNRated voltage of the generator, unit: kV; the third section of low-resistance anti-corona structure 5 is positioned in a linear area 10 at the end part of the bar, and the length L of the third section of low-resistance anti-corona structure 53The length of the fourth section of high-resistance anti-corona structure 6 is equal to that of the end straight line region 10, and the lap joint position of the fourth section of high-resistance anti-corona structure 6 is at the junction of the end straight line region 10 and the tail end corner region 11 of the linear rod; the fourth section of high-resistance anti-corona structure 6 is positioned in a corner area 11 at the tail end of the winding bar and a partial tail end straight line area 12, the distance between the tail end position of the fourth section of high-resistance anti-corona structure 6 and the plane of the pouring glue of the insulating box 13 is more than or equal to 30mm, and the axial surface length of the fourth section of high-resistance anti-corona structure 6 is as follows:
L4≥UN
in the formula, L4The length of the fourth section of high-resistance anti-corona structure is as follows: cm;
4) as shown in fig. 1, the stator bar wrapping process flow and requirements are as follows: after the main insulating material of the mica tape is wrapped on the forming lead 2 in a half lap winding mode, wrapping a layer of low-resistance anti-corona tape on the first section of low-resistance anti-corona structure 3 and the third section of low-resistance anti-corona structure 5 in a half lap winding mode, wherein the anti-corona tapes are parallel and level at the closing-up positions on two sides of the anti-corona tape; a layer of middle corona-resistant material is bound by the middle corona-resistant structure 4 in the second section in a half lap winding mode, and the lap joint distance d between the middle corona-resistant material and the first section of low-resistance corona-resistant structure 3 and the third section of low-resistance corona-resistant structure 5 is 20 mm; a layer of high-resistance anti-corona material is bound on the fourth section of high-resistance anti-corona structure 6 in a half lap winding mode, and the lap joint distance d between the fourth section of high-resistance anti-corona structure 6 and the third section of low-resistance anti-corona structure 5 is 20 mm; an insulation structure 7 is added on the outermost layer of the end part of the wire rod, three layers of multi-glue mica tape materials are bound in a half lap winding mode, and the lap joint distance d covering the second section middle corona-resistant structure 4 and the fourth section high corona-resistant structure 6 is 20 mm;
5) after the main insulating material, the corona-proof material and the additional insulating material are wrapped, the unformed winding bar is placed in a hot-pressing die, a lead is connected with a large current for heating, the heating rate is kept to be 1-2 ℃/min, when the temperature reaches 170-180 ℃, the current is regulated to keep the temperature of the winding bar constant, the power is cut off after the temperature is kept for 6h, and when the die is naturally cooled to be below 60 ℃, the die is removed.

Claims (1)

1. A method for manufacturing a stator bar for improving winding corona voltage is characterized by comprising the following steps:
1) the anti-corona structure at the end part of the stator wire rod sequentially comprises the following components from a stator iron core (1) to a lead (2): the corona-preventing structure comprises a first section of low-resistance corona-preventing structure (3), a second section of middle-resistance corona-preventing structure (4), a third section of low-resistance corona-preventing structure (5) and a fourth section of high-resistance corona-preventing structure (6); the outermost layer of the end part of the wire rod is covered with a section of additional insulation structure (7);
2) the anti-corona material of each anti-corona structure is as follows: the low-resistance anti-corona band material used for the first section low-resistance anti-corona structure (3) and the third section low-resistance anti-corona structure (5) has the width of 25mm, the thickness of 0.08mm and the surface resistivity of 10 under 500V direct-current voltage2Ω～103Omega; the middle resistance anti-corona band material used by the second section middle resistance anti-corona structure (4) has the width of 25mm, the thickness of 0.12mm and the surface resistivity of 1M omega-10 under 3000V direct current voltage3M omega; the high-resistance anti-corona belt material used by the fourth section of high-resistance anti-corona structure (6) has the width of 25mm, the thickness of 0.12mm and the surface resistivity of 10 under the direct-current voltage of 5000V3MΩ～105M omega; the width of the multi-adhesive mica tape material used for the main insulation and the outermost layer additional insulation structure (7) of the wire rod is 25mm, the thickness of the multi-adhesive mica tape material is 0.14mm, and the dielectric strength of the multi-adhesive mica tape material is more than or equal to 40 MV/m;
3) the position and length requirements of each anti-corona structure are as follows: the first section of low-resistance anti-corona structure (3) is positioned in a linear area (8) of a groove part of a bar and a partial initial end corner area (9), the lap joint position of the first section of low-resistance anti-corona structure (3) and the second section of anti-corona structure (4) is positioned in the initial end corner area (9) of the bar, and the lap joint position of the first section of low-resistance anti-corona structure (3) and the second section of anti-corona structure (4) is away from the axial surface of a stator core (1) by a distance L1Not less than 100 mm; the corona prevention structure (4) in the second section is located in a corner area (9) at the starting end of the winding bar, the lap joint position of the corona prevention structure (4) and the low-resistance structure (5) in the third section is located at the junction of the corner area (9) at the starting end of the winding bar and a straight line area (10) at the end part, and the axial surface length of the corona prevention structure (5) in the third section is as follows:
Figure FDA0002466721990000021
in the formula, L2The length of the anti-corona structure in the second section is as follows: cm; u shapeNRated voltage of the generator, unit: kV; the third section of low-resistance anti-corona structure (5) is positioned in a linear area (10) at the end part of the bar, and the length L of the third section of low-resistance anti-corona structure (5)3The length of the fourth section of high-resistance anti-corona structure is equal to that of the end straight line region (10), and the lap joint position of the fourth section of high-resistance anti-corona structure and the fourth section of high-resistance anti-corona structure is at the junction of the end straight line region (10) of the linear bar and the tail end corner region (11); the fourth section of high-resistance anti-corona structure (6) is located in a corner area (11) at the tail end of the winding bar and a straight line area (12) at the tail end of the winding bar, the distance between the tail end of the fourth section of high-resistance anti-corona structure (6) and the plane of the pouring glue of the insulating box (13) is not less than 30mm, and the axial surface length of the fourth section of high-resistance anti-corona structure (6) is as follows:
L4≥UN
in the formula, L4The length of the fourth section of high-resistance anti-corona structure is as follows: cm;
4) the wrapping process flow and requirements of the stator bar are as follows: after the main insulating material of the mica tape is wrapped on the forming lead (2) in a half lap winding mode, wrapping a layer of low-resistance anti-corona tape on the first section of low-resistance anti-corona structure (3) and the third section of low-resistance anti-corona structure (5) in a half lap winding mode, wherein the anti-corona tapes are parallel and level at the closing positions on the two sides of the anti-corona tape; a layer of middle anti-corona material is bound by the middle anti-corona structure (4) in the second section in a half lap winding mode, and the lap joint distance d between the middle anti-corona structure and the first section of low-resistance anti-corona structure (3) and the lap joint distance d between the middle anti-corona structure and the third section of low-resistance anti-corona structure (5) are both 20 mm; a layer of high-resistance anti-corona material is bound on the fourth section of high-resistance anti-corona structure (6) in a half lap winding mode, and the lap joint distance d between the fourth section of high-resistance anti-corona structure and the third section of low-resistance anti-corona structure (5) is 20 mm; an insulation structure (7) is additionally arranged on the outermost layer of the end part of the wire rod, three layers of multi-glue mica tape materials are bound in a half lap winding mode, and the lap joint distance d covering the second section of middle corona-resistant structure (4) and the fourth section of high corona-resistant structure (6) is 20 mm;
5) after the main insulating material, the corona-proof material and the additional insulating material are wrapped, the unformed winding bar is placed in a hot-pressing die, a lead is connected with a large current for heating, the heating rate is kept to be 1-2 ℃/min, when the temperature reaches 170-180 ℃, the current is regulated to keep the temperature of the winding bar constant, the power is cut off after the temperature is kept for 6h, and when the die is naturally cooled to be below 60 ℃, the die is removed.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113178971A (en) * 2021-06-10 2021-07-27 哈尔滨电机厂有限责任公司 Stator bar main insulation structure for improving winding corona voltage

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1066317A (en) * 1996-08-15 1998-03-06 Fuji Electric Co Ltd Heat press device for dry insulating coil
CN1929248A (en) * 2006-08-31 2007-03-14 施之英 Method for twining VPI corona-prevention layer between stator coil main insulating layer and corona-prevention layer
CN2886901Y (en) * 2006-09-21 2007-04-04 王翠苓 Anti-faint protection layer equipped on stator coil in high voltage motor
CN102447361A (en) * 2010-10-12 2012-05-09 哈尔滨电机厂有限责任公司 Preparation method for realizing one-time dip forming of main insulation and anticorona layer of stator coil of large-scale high voltage motor
US9059616B1 (en) * 2014-08-20 2015-06-16 Dantam K. Rao Insulation system for a stator bar with low partial discharge
CN208571764U (en) * 2018-08-07 2019-03-01 苏州巨峰电气绝缘系统股份有限公司 A kind of stator coil of Single-layer Windings high voltage permanent variable-frequency motor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1066317A (en) * 1996-08-15 1998-03-06 Fuji Electric Co Ltd Heat press device for dry insulating coil
CN1929248A (en) * 2006-08-31 2007-03-14 施之英 Method for twining VPI corona-prevention layer between stator coil main insulating layer and corona-prevention layer
CN2886901Y (en) * 2006-09-21 2007-04-04 王翠苓 Anti-faint protection layer equipped on stator coil in high voltage motor
CN102447361A (en) * 2010-10-12 2012-05-09 哈尔滨电机厂有限责任公司 Preparation method for realizing one-time dip forming of main insulation and anticorona layer of stator coil of large-scale high voltage motor
US9059616B1 (en) * 2014-08-20 2015-06-16 Dantam K. Rao Insulation system for a stator bar with low partial discharge
CN208571764U (en) * 2018-08-07 2019-03-01 苏州巨峰电气绝缘系统股份有限公司 A kind of stator coil of Single-layer Windings high voltage permanent variable-frequency motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113178971A (en) * 2021-06-10 2021-07-27 哈尔滨电机厂有限责任公司 Stator bar main insulation structure for improving winding corona voltage

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