CN113258703A - Large-scale generator stator end bevel edge spacer corona discharge inhibition method - Google Patents
Large-scale generator stator end bevel edge spacer corona discharge inhibition method Download PDFInfo
- Publication number
- CN113258703A CN113258703A CN202110654460.6A CN202110654460A CN113258703A CN 113258703 A CN113258703 A CN 113258703A CN 202110654460 A CN202110654460 A CN 202110654460A CN 113258703 A CN113258703 A CN 113258703A
- Authority
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- China
- Prior art keywords
- bevel edge
- scraping
- special
- hammer
- epoxy putty
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 125000006850 spacer group Chemical group 0.000 title claims description 8
- 230000005764 inhibitory process Effects 0.000 title abstract description 6
- 239000004593 Epoxy Substances 0.000 claims abstract description 23
- 230000004048 modification Effects 0.000 claims abstract description 4
- 238000012986 modification Methods 0.000 claims abstract description 4
- 238000007790 scraping Methods 0.000 claims description 15
- 230000007704 transition Effects 0.000 claims description 7
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 230000009974 thixotropic effect Effects 0.000 claims description 3
- 230000001629 suppression Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000000452 restraining effect Effects 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 208000028659 discharge Diseases 0.000 description 14
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention discloses a method for restraining corona discharge of a stator end bevel edge spacing block of a large-scale generator. The invention has the advantages of obvious corona inhibition effect, simple and convenient operation by matching with a special tool, excellent performance, easy modification, no movement in shaping and high surface smoothness by adopting the nano technology for developing the double-component epoxy putty. The end discharge inhibition method disclosed by the invention provides necessary technical support for the development of high-voltage grade air-cooled water and a steam turbine generator unit, and the invention is used for assisting the compact development of large motors and has great economic benefit and social value.
Description
Technical Field
The invention relates to the field of generators, in particular to a method for restraining corona discharge of a bevel edge spacer block at the end part of a stator of a large-scale generator.
Background
With the high-speed development of an electric power system, a large-scale rotating motor continuously develops towards the aspects of high voltage level, large capacity, compactness and the like, the restriction on the whole machine is increasingly highlighted by the corona-proof level of the whole machine, the bevel edge at the end part of a stator is a serious disaster area of corona discharge of the whole machine, the bevel edge gap is an important factor for restricting the compact development of the motor, the interphase bevel edge corona discharge is easily caused by the excessively small bevel edge gap, the running safety of a unit is influenced, and in view of the structural design of the motor and the discharge principle of a flat capacitor, the bevel edge spacing block is a bevel edge discharge symptom. The corona discharge can be greatly weakened by constructing the arc-shaped smooth transition region at the junction of the spacing block and the stator bar, but the space at the junction is narrow and indefinite, and conventional materials have the problems of insufficient flow, adhesive strength, smoothness and the like, so that the development of the method is restricted. The use of the nano material successfully overcomes the problems of smoothness, fluidity, bonding force and the like.
Disclosure of Invention
In view of the above, the present invention provides a method for suppressing corona discharge of a bevel spacer at the end of a stator of a large generator, which greatly improves the capability of bevel corona discharge prevention, and is a necessary technology for large motors to develop toward higher voltage levels and more compact designs.
The technical scheme adopted by the invention is as follows:
a. the required material is special double-component room temperature curing epoxy putty, and a special rubber cylinder, a rubber gun, a rubber nozzle, a scraping hammer and a scraping plate are arranged;
b. extruding special epoxy putty in a rubber cylinder to the junction edge by using a special glue gun and a glue nozzle at the bevel edge spacing block at the end part of the large generator stator to form a uniform adhesive tape with complete length coverage;
c. scraping the adhesive tape from outside to inside at a constant speed by using a scraping hammer head until the end to form a continuous and uniform circular arc transition structure;
d. carefully scraping the epoxy putty accumulated on the two sides of the edge by using a scraper, if the arc transition structure is damaged in the process, reshaping by using a scraper hammer, and curing at room temperature for 24 hours after the operation is finished;
e. the special double-component room temperature curing epoxy putty is a nano modified epoxy resin compound, the thixotropic value is more than 6, and the dielectric strength is not less than 15 MV/m;
f. the container for containing the epoxy putty is a two-component rubber cylinder with a fixed proportion, and self-mixing rubber nozzles with the same quantity as the rubber cylinder are required to be arranged when the container is used;
g. the modification tool is a small hammer with a spherical hammer head and a handle, and the hammer head is made of polytetrafluoroethylene and has the diameter of 8 mm;
h. the scraper is processed by an epoxy laminated board and is cuboid.
The invention has the beneficial effects that:
1) stator end bevel edge discharge is greatly suppressed. The suppression method provided by the invention can greatly suppress the bevel edge corona discharge at the end part of the stator of the large-scale motor, and is a necessary component for the improvement of the whole machine anti-corona technology;
2) the operation process is simple and convenient. By applying the inhibition technology provided by the invention, the development and the preparation of the used epoxy putty and matched tools greatly simplify the operation process and reduce the operation dispersity and complexity;
3) smooth surface and beautiful appearance. The epoxy resin is modified by adopting the nanotechnology, so that the surface of a cured product is very smooth, the glossiness is high, the electric resistance is excellent, and the appearance is attractive;
drawings
Figure 1 is a schematic view of a stator end bevel spacer block prior to treatment.
Fig. 2 is a schematic view of a portion (upper left corner) of the spacer block.
FIG. 3 is a schematic diagram of the epoxy putty being attached.
FIG. 4 is a schematic view of the epoxy putty after finishing its form.
FIG. 5 is a schematic view of a completed gapping block after finishing the shaping.
The notation in the figure is: 1 is a stator bar, 2 is a spacing block, and 3 is special epoxy putty.
Detailed Description
The invention relates to a large-scale generator stator end bevel edge spacer corona discharge inhibition technology, which comprises the following process steps:
a. the required material is special double-component room temperature curing epoxy putty, and a special rubber cylinder, a rubber gun, a rubber nozzle, a scraping hammer and a scraping plate are arranged;
b. extruding special epoxy putty in a rubber cylinder to the junction edge by using a special glue gun and a glue nozzle at the position of a bevel edge spacing block at the end part of a large generator stator as shown in figures 1 and 2 to form a uniform adhesive tape with complete length coverage as shown in figure 3;
c. scraping the adhesive tape from outside to inside at a constant speed by using a scraping hammer head until the end to form a continuous and uniform circular arc transition structure as shown in figure 4;
d. carefully scraping the epoxy putty accumulated on the two sides of the edge by using a scraper, if the arc transition structure is damaged in the process, reshaping by using a scraper hammer, curing at room temperature for 24 hours after the operation is finished, and finishing as shown in figure 5;
e. the special double-component room temperature curing epoxy putty is a nano modified epoxy resin compound, the thixotropic value is more than 6, and the dielectric strength is not less than 15 MV/m;
f. the container for containing the epoxy putty is a two-component rubber cylinder with a fixed proportion, and self-mixing rubber nozzles with the same quantity as the rubber cylinder are required to be arranged when the container is used;
g. the modification tool is a small hammer with a spherical hammer head and a handle, and the hammer head is made of polytetrafluoroethylene and has the diameter of 8 mm;
h. the scraper is processed by an epoxy laminated board and is cuboid.
The method for restraining corona discharge of the bevel edge spacing block at the end part of the large generator stator can greatly strengthen the capability of preventing corona discharge at the bevel edge spacing block, namely, the allowable withstand voltage grade is improved on the basis of not enlarging the gap, and the bevel edge gap is reduced on the basis of not reducing the voltage grade. The invention makes the development of large-scale generator sets with higher voltage grade and smaller bevel edge clearance possible, greatly benefits the bidirectional development of large-scale motors to high voltage grade and compactness, and has great economic benefit and social value.
The invention is not to be considered as limited to the specific embodiments thereof, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (1)
1. A large-scale generator stator end bevel edge spacer block corona discharge suppression method is characterized by comprising the following steps:
a. the required material is special double-component room temperature curing epoxy putty, and a special rubber cylinder, a rubber gun, a rubber nozzle, a scraping hammer and a scraping plate are arranged;
b. extruding special epoxy putty in a rubber cylinder to the junction edge by using a special glue gun and a glue nozzle at the bevel edge spacing block at the end part of the large generator stator to form a uniform adhesive tape with complete length coverage;
c. scraping the adhesive tape from outside to inside at a constant speed by using a scraping hammer head until the end to form a continuous and uniform circular arc transition structure;
d. carefully scraping the epoxy putty accumulated on the two sides of the edge by using a scraper, if the arc transition structure is damaged in the process, reshaping by using a scraper hammer, and curing at room temperature for 24 hours after the operation is finished;
e. the special double-component room temperature curing epoxy putty is a nano modified epoxy resin compound, the thixotropic value is more than 6, and the dielectric strength is not less than 15 MV/m;
f. the container for containing the epoxy putty is a two-component rubber cylinder with a fixed proportion, and self-mixing rubber nozzles with the same quantity as the rubber cylinder are required to be arranged when the container is used;
g. the modification tool is a small hammer with a spherical hammer head and a handle, and the hammer head is made of polytetrafluoroethylene and has the diameter of 8 mm;
h. the scraper is processed by an epoxy laminated board and is cuboid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110654460.6A CN113258703A (en) | 2021-06-11 | 2021-06-11 | Large-scale generator stator end bevel edge spacer corona discharge inhibition method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110654460.6A CN113258703A (en) | 2021-06-11 | 2021-06-11 | Large-scale generator stator end bevel edge spacer corona discharge inhibition method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113258703A true CN113258703A (en) | 2021-08-13 |
Family
ID=77187657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110654460.6A Pending CN113258703A (en) | 2021-06-11 | 2021-06-11 | Large-scale generator stator end bevel edge spacer corona discharge inhibition method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113258703A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783385A (en) * | 2021-10-11 | 2021-12-10 | 哈尔滨电机厂有限责任公司 | A kind of repairing method of stator winding interphase corona condition |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558532A (en) * | 2004-01-14 | 2004-12-29 | 东方电机股份有限公司 | Stator bar coating type corona protective layer and its making process |
| CN2674753Y (en) * | 2004-01-14 | 2005-01-26 | 东方电机股份有限公司 | Stator wire bar coated corona-prevention structure |
| CN1572837A (en) * | 2003-06-04 | 2005-02-02 | 纳幕尔杜邦公司 | High temperature polymeric materials containing corona resistant composite filler, and preparing methods thereof |
| CN1995248A (en) * | 2006-12-22 | 2007-07-11 | 王翠苓 | Air-drying high resistance corona-proof paint for high voltage motor stator coil and coil end |
| CN101656440A (en) * | 2009-09-04 | 2010-02-24 | 无锡哈电电机有限公司 | Interturn insulating structure of high-voltage motor stator coil |
| CN103051093A (en) * | 2012-12-03 | 2013-04-17 | 江苏航天动力机电有限公司 | Safety-increased type motor anticorona structure |
| CN207184201U (en) * | 2017-09-15 | 2018-04-03 | 中国长江电力股份有限公司 | A kind of anticorona fixing device in turbine generator stator bar end |
-
2021
- 2021-06-11 CN CN202110654460.6A patent/CN113258703A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1572837A (en) * | 2003-06-04 | 2005-02-02 | 纳幕尔杜邦公司 | High temperature polymeric materials containing corona resistant composite filler, and preparing methods thereof |
| CN1558532A (en) * | 2004-01-14 | 2004-12-29 | 东方电机股份有限公司 | Stator bar coating type corona protective layer and its making process |
| CN2674753Y (en) * | 2004-01-14 | 2005-01-26 | 东方电机股份有限公司 | Stator wire bar coated corona-prevention structure |
| CN1995248A (en) * | 2006-12-22 | 2007-07-11 | 王翠苓 | Air-drying high resistance corona-proof paint for high voltage motor stator coil and coil end |
| CN101656440A (en) * | 2009-09-04 | 2010-02-24 | 无锡哈电电机有限公司 | Interturn insulating structure of high-voltage motor stator coil |
| CN103051093A (en) * | 2012-12-03 | 2013-04-17 | 江苏航天动力机电有限公司 | Safety-increased type motor anticorona structure |
| CN207184201U (en) * | 2017-09-15 | 2018-04-03 | 中国长江电力股份有限公司 | A kind of anticorona fixing device in turbine generator stator bar end |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783385A (en) * | 2021-10-11 | 2021-12-10 | 哈尔滨电机厂有限责任公司 | A kind of repairing method of stator winding interphase corona condition |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210813 |
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| WD01 | Invention patent application deemed withdrawn after publication |