CN104901493A - One-time hydraulic forming method for major insulation and anti-corona layer of high-voltage armature winding - Google Patents
One-time hydraulic forming method for major insulation and anti-corona layer of high-voltage armature winding Download PDFInfo
- Publication number
- CN104901493A CN104901493A CN201510320563.3A CN201510320563A CN104901493A CN 104901493 A CN104901493 A CN 104901493A CN 201510320563 A CN201510320563 A CN 201510320563A CN 104901493 A CN104901493 A CN 104901493A
- Authority
- CN
- China
- Prior art keywords
- armature winding
- paint
- static capacity
- value
- shaped stator
- 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.)
- Granted
Links
Abstract
The invention discloses a one-time hydraulic forming method for a major insulation and anti-corona layer of a high-voltage armature winding, and the method comprises the following steps: (1) enabling a strip-shaped stator wire rod to be wound around a low-resistance belt, a medium-resistance belt and a high-resistance belt in a semi-stacked manner; (2) binding up a demould belt; (3) carrying out the brushing of mixed liquid, then carrying out drying in a dry-off oven, putting the strip-shaped stator wire rod into an impregnating vessel, and connecting a capacitance measurement end; (4) starting a vacuum machine set for vacuumizing; (5) injecting impregnating varnish into the impregnating vessel, and keeping the pressure; (6) determining the ending of impregnating after conditions are met; (7) taking out the strip-shaped stator wire rod after paint return, and drying the strip-shaped stator wire rod; (8) removing the demould belt, and coating an end part with high-resistance paint, thereby forming the strip-shaped stator wire rod for the one-time hydraulic forming VPI preparation method for the major insulation and anti-corona layer of the high-voltage armature winding. The method is good in reliability, can meet the demands of the one-time molding of the major insulation and anti-corona layer of the high-voltage armature winding with a voltage of 26KV or more, and employs an electrostatic capacity calculation method for accurately determining whether the impregnating is completed or not.
Description
Technical field
The invention belongs to armature winding preparation field, be specifically related to high pressure armature winding main insulation and anticorona coating hydraulic pressure one-step moulding method.
Background technology
Generator Stator winding is the capital equipment element that generator produces electric energy, also be the main carriers that electric current flows through in generator frame simultaneously, in the process that electric power system normally runs, motor end stator bar can produce very large sinusoidal voltage, easy generation corona and electric discharge corrosion phenomenon, the security of operation of serious threat unit.In order to improve this situation, line stick end needs to carry out anti-corona process, and object is, makes line stick end Electric Field Distribution even, the operationally alternate not bloom of electronics winding overhang, does not discharge.Along with the raising of Rated motor voltage and capacity, anti dizzy structure becomes complicated, China has manufactured successful single-machine capacity million kilowatt high-rating generator electric pressure can reach 26KV, and this just proposes very high requirement to the technology of high-rating generator main insulation and anti dizzy structure.How assisting anti-corona design by reasonably computational methods, is the problem that insulation technology field is urgently furtherd investigate.
The insulation formation process of generator windings can be divided into many glue die press technology for forming and few glue hydroforming process, each insulation relevant research and development maker is maintained secrecy to respective insulation moulding process in the world, the insulation moulding process of domestic each generator manufacturer is due to history in decades, based on many rubber mouldings pressure.Along with international manufacturing enterprise cracks the China market, few glue technology by increasing China colleague cognition.Compared obvious advantage with many glue die press technology for forming, under identical voltage endurance capability, insulation thickness can significantly reduce, special due to its course of processing, without possibility that there is any bubble in insulation, improves the quality insulated.Although have the feature that dielectric loss angle tangent is generally higher, but still can be controlled in tolerance interval, outstanding dielectric property and outstanding mechanical performance make in market competition, have very large advantage.For many years, domestic many motor manufacturing enterprises attempt and use the few glue hydroforming process of insulation, most examples of many successful is all on the whole soaking technology of low voltage motor, the example that high pressure armature winding is trial-produceed successfully also rarely has generation, but very loaded down with trivial details in its manufacturing process, need to carry out aftertreatment even three process.Its reason is that armature winding can partial discharge phenomenon occur higher than during 5kV at the end surface of armature winding and air at voltage, very strong corrosiveness is had to stator insulation, high pressure armature winding needs to carry out anti-corona process, Anti-Corona Material needs to make its property retention in certain scope in the course of processing, especially its nonlinear curve.
Vacuum Pressure Impregnation Equipment (VPI) is process equipment important in high pressure armature winding one-shot forming production process, utilize vacuum pressure impregnation, insulation processing is carried out to high pressure armature winding, significantly can reduce bubble, the pin hole in insulating barrier, thus improve the class of insulation of high-voltage motor, be subject to very big attention both domestic and external and development, but there is no clear and definite way for flooding the judgement when completed, mostly be determined by experience by technical staff, repetitive operation is poor, judges that otherness is larger.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of high pressure armature winding main insulation and anticorona coating hydraulic pressure one-step moulding method, this method good reliability, can meet the main insulation of high pressure armature winding and the one-shot forming of anticorona coating of 26KV above, adopt static capacity computing method accurately to determine whether dipping completes simultaneously.
Technical scheme of the present invention is: high pressure armature winding main insulation and anticorona coating hydraulic pressure one-step moulding method, comprise the steps:
(1), on bar shaped stator bar, wrapped up main insulation after, by model line, half-stack package one deck low-resistance belt, stopband, high stop band in being wound around step by step, be wound around in half-lap mode, stopband length 20mm in high stop band overlap joint, middle stopband overlap joint low-resistance belt length 20mm;
(2) overall wrapping one deck demoulding band after, having wrapped anticorona coating;
(3), bar shaped stator bar is evenly coated with the mixed solution brushing silicon rubber and dimethylbenzene, at entering baker 140 DEG C-200 DEG C, toasts 0.5h-2h, after being cooled to normal temperature, being loaded impregnating vessel sealing, connect capacitance measurement end simultaneously;
(4), start vacuum pump set impregnating vessel is vacuumized, be evacuated to below 10Pa, pressurize 4h-6h, simultaneously to storage paint can heat, with tank wall oil endless form heating, be heated to 60 DEG C;
(5), open defeated paint valve and start defeated impregnating varnish in impregnating vessel, paint temperature requires at 60 DEG C, defeated paint completely after lacquer painting at least should exceed winding 100mm, keep 100-300Pa state 1h-2h in impregnating vessel;
(6), impregnating vessel is forced into 0.5-0.7MPa, pressurize 4h-5h, meets following three conditions and then can confirm that dipping terminates:
The static capacity of A, winding reaches capacity,
B, confirmation Cs/Co value, Cs/Co value will more than setting, and wherein Co is the static capacity that paint injects front winding, the static capacity of winding at the end of Cs is pressurization, and setting is 3.0,
C, confirmation Cf/Cs value, Cf/Cs value will more than value up to standard, and wherein Cf is the static capacity that pressure release terminates rear winding, and value up to standard is 0.995;
(7), in impregnating vessel pressure release to 0.2-0.3MPa, back paint in storage paint can, back paint takes out bar shaped stator bar completely afterwards, then puts into 100 DEG C of baking ovens, insulation 1h-2h, then baking oven is warmed up to 170 DEG C, is incubated 12h-14h, is placed with promoter in baking oven;
(8), remove demoulding band, under room temperature condition, online stick end brush one deck high resistant paint, has namely made bar shaped stator bar prepared by high pressure armature winding main insulation and the one-time formed VPI of anticorona coating hydraulic pressure.
Further, assert the saturated condition of static capacity be following any one:
(1) when, static capacity increment rate is 0;
(2), static capacity linearly increases, that is: static capacity increases to linearity, and increment rate 0.5%/hour below;
If when above-mentioned condition does not meet, then extend pressing time, every the change of one hour measurement of electrostatic capacity, pressurization is till satisfying condition.
Further, when Cs/Co value does not reach setting, if meet following three conditions to be considered as dipping end equally:
(1), static capacity increment rate is 0;
(2), Cs/Co value is more than 90% of setting;
(3), bar line electric wire rod be applied in rated voltage on the motor of below 3.0KV time.
Further, the demoulding band in step (2) is polytetrafluoroethylene demoulding band.
Further, the high resistant paint 4# viscosity cup in step (8) mixes up, and viscosity is 40s-45s.
Further, the promoter in step (7) is N, N-dimethyl benzylamine.
Beneficial effect of the present invention is:
1, the present invention adopts main insulation and the few glue of anticorona coating VPI to press one-time formed process, and technology is feasible, pollution-free, little to Health Impact, can be used for the insulation system preparing high-tension generator bar shaped stator bar.
2, judge whether dipping completes, and change the method that traditional dependence experience judges, accuracy is high by direct capacitance value, repeatable strong, fill up domestic blank.
3, the bar shaped stator bar of preparation, dielectric loss value after measured, ranking performs by " JB/T7608-2006 " standard, reaches more than Grade A standard; Instantaneous frequency breakdown voltage after measured, quality standard performs by " DS/ZJ011-2002 " standard, reaches more than Grade A standard; Sheet resistance after measured, sheet resistance value is all at 1*10
3-1*10
5between Ω; Every anti-corona technique index reaches domestic and international advanced level, is with a wide range of applications, for high pressure armature winding provides reliable anti-corona treatment technology.
Embodiment
Brief description is made to the specific embodiment of the present invention below.
Embodiment 1
High pressure armature winding main insulation and anticorona coating hydraulic pressure one-step moulding method, comprise the steps:
(1), on bar shaped stator bar, wrapped up main insulation after, by model line, half-stack package one deck low-resistance belt, stopband, high stop band in being wound around step by step, be wound around in half-lap mode, stopband length 20mm in high stop band overlap joint, middle stopband overlap joint low-resistance belt length 20mm;
(2), wrapped overall wrapping one deck demoulding band after anticorona coating, demoulding band is polytetrafluoroethylene demoulding band;
(3), bar shaped stator bar is evenly coated with the mixed solution brushing silicon rubber and dimethylbenzene, at entering baker 200 DEG C, toasts 2h, after being cooled to normal temperature, being loaded impregnating vessel sealing, connect capacitance measurement end simultaneously;
(4), start vacuum pump set impregnating vessel is vacuumized, be evacuated to below 10Pa, pressurize 4h, simultaneously to storage paint can heat, with tank wall oil endless form heating, be heated to 60 DEG C;
(5), open defeated paint valve and start defeated impregnating varnish in impregnating vessel, paint temperature requires at 60 DEG C, defeated paint completely after lacquer painting at least should exceed winding 100mm, keep 100-300Pa state 2h in impregnating vessel;
(6), impregnating vessel is forced into 0.7MPa, pressurize 4h, meets following three conditions and then can confirm that dipping terminates:
The static capacity of A, winding reaches capacity, assert the saturated condition of static capacity be following any one:
When a, static capacity increment rate are 0;
B, static capacity linearly increase, that is: static capacity increases to linearity, and increment rate 0.5%/hour below;
If when above-mentioned condition does not meet, then extend pressing time, every the change of one hour measurement of electrostatic capacity, pressurize till satisfying condition,
B, confirmation Cs/Co value, Cs/Co value will more than setting, and wherein Co is the static capacity that paint injects front winding, the static capacity of winding at the end of Cs is pressurization, setting is 3.0, when Cs/Co value does not reach setting, if meet following three conditions to be considered as dipping end equally:
A, static capacity increment rate are 0,
B, Cs/Co value more than 90% of setting,
C, bar line electric wire rod be applied in rated voltage on the motor of below 3.0KV time,
C, confirmation Cf/Cs value, Cf/Cs value will more than value up to standard, and wherein Cf is the static capacity that pressure release terminates rear winding, and value up to standard is 0.995;
(7), in impregnating vessel pressure release to 0.2MPa, back paint in storage paint can, back paint takes out bar shaped stator bar completely afterwards, then puts into 100 DEG C of baking ovens, insulation 1h, then baking oven is warmed up to 170 DEG C, insulation 12h, be placed with promoter in baking oven, promoter is N, N-dimethyl benzylamine;
(8) demoulding band, is removed, under room temperature condition, online stick end brush one deck high resistant paint, high resistant paint 4# viscosity cup mixes up, viscosity is 40s-45s, namely bar shaped stator bar prepared by high pressure armature winding main insulation and the one-time formed VPI of anticorona coating hydraulic pressure has been made, through visual examination, surperficial flawless, corrugationless, dipping enamelled coating is even, color and luster is consistent, and each several part size conforms drawing requirement, global consistency is good.
The mensuration of embodiment 2 dielectric loss value
In production process, the line rod taking a sample test 3% does normality, hot dielectric loss value, and ranking performs by more than " JB/T7608-2006 " standard Grade A regulation.
The instantaneous frequency breakdown voltage experiment of embodiment 3
In production process, take a sample test 3 branch line rods and do the experiment of instantaneous frequency breakdown voltage, line rod quality standard performs by " DS/ZJ011-2002 " standard, reaches more than Grade A.
Embodiment 4 sheet resistance measures
In production process, sheet resistance is taken a sample test by 10%, and sheet resistance value is all at 1*10
3-1*10
5between Ω.
Above embodiments of the invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (6)
1. high pressure armature winding main insulation and anticorona coating hydraulic pressure one-step moulding method, is characterized in that, comprise the steps:
(1), on bar shaped stator bar, wrapped up main insulation after, by model line, half-stack package one deck low-resistance belt, stopband, high stop band in being wound around step by step, be wound around in half-lap mode, stopband length 20mm in high stop band overlap joint, middle stopband overlap joint low-resistance belt length 20mm;
(2) overall wrapping one deck demoulding band after, having wrapped anticorona coating;
(3), bar shaped stator bar is evenly coated with the mixed solution brushing silicon rubber and dimethylbenzene, at entering baker 140 DEG C-200 DEG C, toasts 0.5h-2h, after being cooled to normal temperature, being loaded impregnating vessel sealing, connect capacitance measurement end simultaneously;
(4), start vacuum pump set impregnating vessel is vacuumized, be evacuated to below 10Pa, pressurize 4h-6h, simultaneously to storage paint can heat, with tank wall oil endless form heating, be heated to 60 DEG C;
(5), open defeated paint valve and start defeated impregnating varnish in impregnating vessel, paint temperature requires at 60 DEG C, defeated paint completely after lacquer painting at least should exceed winding 100mm, keep 100-300Pa state 1h-2h in impregnating vessel;
(6), impregnating vessel is forced into 0.5-0.7MPa, pressurize 4h-5h, meets following three conditions and then can confirm that dipping terminates:
The static capacity of A, winding reaches capacity,
B, confirmation Cs/Co value, Cs/Co value will more than setting, and wherein Co is the static capacity that paint injects front winding, the static capacity of winding at the end of Cs is pressurization, and setting is 3.0,
C, confirmation Cf/Cs value, Cf/Cs value will more than value up to standard, and wherein Cf is the static capacity that pressure release terminates rear winding, and value up to standard is 0.995;
(7), in impregnating vessel pressure release to 0.2-0.3MPa, back paint in storage paint can, back paint takes out bar shaped stator bar completely afterwards, then puts into 100 DEG C of baking ovens, insulation 1h-2h, then baking oven is warmed up to 170 DEG C, is incubated 12h-14h, is placed with promoter in baking oven;
(8), remove demoulding band, under room temperature condition, online stick end brush one deck high resistant paint, has namely made bar shaped stator bar prepared by high pressure armature winding main insulation and the one-time formed VPI of anticorona coating hydraulic pressure.
2. high pressure armature winding main insulation according to claim 1 and anticorona coating hydraulic pressure one-step moulding method, is characterized in that, assert the saturated condition of static capacity be following any one:
(1) when, static capacity increment rate is 0;
(2), static capacity linearly increases, that is: static capacity increases to linearity, and increment rate 0.5%/hour below.
3. high pressure armature winding main insulation according to claim 1 and anticorona coating hydraulic pressure one-step moulding method, is characterized in that, when Cs/Co value does not reach setting, if meet following three conditions to be considered as dipping end equally:
(1), static capacity increment rate is 0;
(2), Cs/Co value is more than 90% of setting;
(3), bar line electric wire rod be applied in rated voltage on the motor of below 3.0KV time.
4. high pressure armature winding main insulation according to claim 1 and anticorona coating hydraulic pressure one-step moulding method, is characterized in that, the demoulding band in step (2) is polytetrafluoroethylene demoulding band.
5. high pressure armature winding main insulation according to claim 1 and anticorona coating hydraulic pressure one-step moulding method, is characterized in that, the viscosity of the high resistant paint in step (8) is 40s-45s.
6. high pressure armature winding main insulation according to claim 1 and anticorona coating hydraulic pressure one-step moulding method, is characterized in that, the promoter in step (7) is N, N-dimethyl benzylamine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510320563.3A CN104901493B (en) | 2015-06-11 | 2015-06-11 | High pressure armature winding major insulation and anti-halo layer hydraulic pressure one-step moulding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510320563.3A CN104901493B (en) | 2015-06-11 | 2015-06-11 | High pressure armature winding major insulation and anti-halo layer hydraulic pressure one-step moulding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104901493A true CN104901493A (en) | 2015-09-09 |
| CN104901493B CN104901493B (en) | 2017-12-12 |
Family
ID=54033962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510320563.3A Active CN104901493B (en) | 2015-06-11 | 2015-06-11 | High pressure armature winding major insulation and anti-halo layer hydraulic pressure one-step moulding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104901493B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050104252A1 (en) * | 2002-01-31 | 2005-05-19 | Hisayuki Hirai | Method of manufacturing insulated coil of rotating electric machine and insulated coil |
| 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 |
| CN102780339A (en) * | 2012-08-09 | 2012-11-14 | 上海电气集团上海电机厂有限公司 | Monitoring method for motor stator vacuum pressure full-impregnation process |
| CN103066777A (en) * | 2012-12-13 | 2013-04-24 | 哈尔滨电气动力装备有限公司 | Large alternating current motor stator winding head technology capable of preventing impregnating resin from being lost |
| CN104485767A (en) * | 2014-12-15 | 2015-04-01 | 哈尔滨电气动力装备有限公司 | High-voltage motor stator coil insulation structure and process for impregnating and curing high-voltage motor stator coil insulation structure |
-
2015
- 2015-06-11 CN CN201510320563.3A patent/CN104901493B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050104252A1 (en) * | 2002-01-31 | 2005-05-19 | Hisayuki Hirai | Method of manufacturing insulated coil of rotating electric machine and insulated coil |
| 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 |
| CN102780339A (en) * | 2012-08-09 | 2012-11-14 | 上海电气集团上海电机厂有限公司 | Monitoring method for motor stator vacuum pressure full-impregnation process |
| CN103066777A (en) * | 2012-12-13 | 2013-04-24 | 哈尔滨电气动力装备有限公司 | Large alternating current motor stator winding head technology capable of preventing impregnating resin from being lost |
| CN104485767A (en) * | 2014-12-15 | 2015-04-01 | 哈尔滨电气动力装备有限公司 | High-voltage motor stator coil insulation structure and process for impregnating and curing high-voltage motor stator coil insulation structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104901493B (en) | 2017-12-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102868264A (en) | Stator winding hot-immersion and heating system and process | |
| CN104485767B (en) | High-voltage motor stator coil insulation structure and process for impregnating and curing high-voltage motor stator coil insulation structure | |
| CN103985498A (en) | Electromagnetic coil device and production process thereof | |
| CN104290335A (en) | Production process of insulation pull rod | |
| CN102255448B (en) | Insulation manufacturing method for wind driven generator | |
| CN101608954A (en) | A kind of manufacture method of NTC temperature sensor | |
| CN102364840B (en) | Method for manufacturing stator bar of air-cooling 200MW steam turbogenerator | |
| CN103475174B (en) | The manufacture craft of coil of stator of motor is manufactured by vacuum pressure impregnation | |
| CN102447361A (en) | Preparation method for realizing one-time dip forming of main insulation and anticorona layer of stator coil of large-scale high voltage motor | |
| CN104901493A (en) | One-time hydraulic forming method for major insulation and anti-corona layer of high-voltage armature winding | |
| CN106549541A (en) | A kind of high-temperature electric machine armature insulation handling process | |
| CN102185428B (en) | Winding type motor rotor manufacture method | |
| CN108109842A (en) | A kind of aluminum hull noinductive capacitor production method | |
| CN110518762A (en) | A kind of stator bar lacks glue insulation Novel heating curing method | |
| CN202149817U (en) | Temperature sensor | |
| CN101345458A (en) | Full anti-dizzy VPI impregnation stator line stick and its industrial frequency overpressure-resistant detection method | |
| CN203225608U (en) | Vacuum pressure impregnation-molded stator bar structure of 18kV water-pumping energy-storage set unit | |
| CN112706356B (en) | Single-branch VPI impregnation curing molding process of generator stator bar mold type | |
| CN103066777B (en) | Large alternating current motor stator winding head technology capable of preventing impregnating resin from being lost | |
| CN104934168B (en) | The manufacture method of self-adhesive and high-strength enamel-covered wire | |
| CN204554238U (en) | A kind of aluminum foil composite heat shroud | |
| CN102717474B (en) | Forming process for combining polylaurolactam (PA) 12 and metal insert | |
| CN206696378U (en) | It is a kind of to solve the problems, such as the device of transformer partial discharge | |
| CN206968021U (en) | One kind is used for tire-mold heater | |
| CN105743304A (en) | Motor winding surface drying process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |