CN214900383U

CN214900383U - Corona-proof insulation structure suitable for 5km high-voltage generator

Info

Publication number: CN214900383U
Application number: CN202121574946.0U
Authority: CN
Inventors: 石斌; 邬向东; 张庆玉; 吴红; 龚羊飞
Original assignee: Anhui Evotec Power Generation Co ltd
Current assignee: Anhui Evotec Power Generation Co ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2021-11-26
Anticipated expiration: 2031-07-12

Abstract

The utility model relates to a generator technical field, concretely relates to prevent corona insulation system suitable for 5km height above sea level high voltage generator, include the stator and imbed the coil winding between stator slot, the coil winding comprises the bare copper line of rectangle and the lead insulation, tip insulation and the main insulation of package in its outside different positions, and the three is the lamellar structure, the outside of bare copper line is followed it and is radially wrapped in proper order and has autohension imine film and interturn mica tape, the lead insulation is including setting up the outer glass cloth of bare copper line is few gluey mica tape and glass silk tape. The utility model discloses in, based on high voltage generator's key lies in its high pressure part insulation system's unity, this structure is followed insulating varnish, few glue mica tape and electromagnetic wire and is started, all adopts the insulation system through UL authentication, can obtain the best matching nature under the mutual compatible condition of part.

Description

Corona-proof insulation structure suitable for 5km high-voltage generator

Technical Field

The utility model relates to a generator technical field, concretely relates to prevent corona insulation system suitable for 5km high-voltage generator at sea level.

Background

The generator is a mechanical device which converts other forms of energy into electric energy, is driven by a water turbine, a steam turbine, a diesel engine or other power machines, converts energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy to be transmitted to the generator, and then converts the mechanical energy into electric energy, and the generator has wide application in industrial and agricultural production, national defense, science and technology and daily life.

The stator coil of the generator needs to be insulated, a common stator coil insulation structure is realized by wrapping the stator coil with a mica tape, and for a 10KV high-voltage generator special for being used at an altitude of 4500 + 5000m, as the product is special for a high-altitude area of 4500 + 5000m, and the environmental temperature is between-40 ℃ and +55 ℃, under the environment, the corona resistance property of a normal stator coil insulation structure is reduced due to the fact that the density of high altitude air is lower in a high-voltage 10000V high-power generator, a discharge layer (namely corona) is easily formed on the surface of the stator coil, the service life of the generator insulation is greatly shortened due to the corona, and meanwhile, the strength of the corona is increased along with the increase of the altitude, and the service life of the high-voltage generator can be quickly shortened along with the increase of the altitude.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technical problem mentioned above, the utility model aims to provide a be applicable to 5km height above sea level high voltage generator and prevent corona insulation system, through long-term experiment and investigation, the utility model discloses corona insulation system is prevented to high pressure among the technical scheme, can realize that stator coil should not produce the corona at 27000V withstand voltage lower coil surface when height above sea level 4500M, stator coil should not produce the corona at 30000V withstand voltage lower coil surface when height above sea level 5000M, promptly the utility model discloses technical scheme's generator can be exclusively used in 4500 plus 5000M high-altitude area, ambient temperature-40 ℃ - +55 ℃, high-power electricity generation of high-pressure 10000V.

The purpose of the utility model can be realized by the following technical scheme:

an anti-corona insulation structure suitable for a 5km high-voltage generator comprises a stator and a coil winding embedded between stator slots, the coil winding is composed of a rectangular bare copper wire, lead wire insulation, end insulation and main insulation which are wrapped at different positions outside the rectangular bare copper wire, the three are layered structures, the outer part of the bare copper wire is sequentially wrapped with a self-adhesive imine film and an interturn mica tape along the radial direction, the lead insulation comprises a glass cloth dry mica tape and a glass ribbon which are arranged outside the bare copper wire, the end insulation comprises a single-sided glass cloth mica tape with less glue, an imine film reinforced mica tape with less glue, a middle-resistance anti-corona tape, a high-resistance anti-corona tape and a breathable protective tape which are arranged outside the bare copper wire, the main insulation comprises a single-sided glass cloth mica tape, an imine film reinforced mica tape and a low-resistance anti-corona tape which are arranged outside the bare copper wire.

Further, the self-adhesive imine film and the interturn mica tape are wrapped outside the bare copper wire in a half-lap wrapping mode, and the self-adhesive imine film, the interturn mica tape and the bare copper wire are combined to form the electromagnetic wire.

The electromagnetic wire is characterized in that a plurality of layers of single-sided glass cloth dry mica tapes and a plurality of layers of imine film reinforced dry mica tapes are sequentially wound at positions, corresponding to the end insulation and the main insulation, outside the electromagnetic wire, wrapped outside the electromagnetic wire in a half-lap wrapping mode, and overlapped in a mixed wrapping mode.

Further, a low-resistance anti-corona tape is wrapped at the position, corresponding to the main insulation, outside the imine film reinforced low-gelatine powder mica tape in a lap-wrapping mode.

Further, a middle-resistance anti-corona belt and a high-resistance anti-corona belt are sequentially wound at the position, corresponding to the end insulation, of the outer part of the imine film reinforced low-gelatine powder mica tape, and a breathable protective belt is wound on the outer part of the high-resistance anti-corona belt in a half-lap wrapping mode.

Further, polyester felt is wrapped at the joint of the end insulation and the lead insulation in an overlapping mode.

Further, the glass cloth mica tape with less glue and the glass ribbon are sequentially wound at the position, corresponding to the lead insulation, outside the interturn mica tape.

And further, after the lead insulation, the end insulation and the main insulation are connected and a voltage withstand test is completed, impregnating H-level insulating resin once according to VPI (vacuum pressure impregnation) of a process rule, and drying the lead insulation, the end insulation and the main insulation, and then performing surface paint dipping treatment by using less glue vacuum pressure.

The utility model has the advantages that:

1. the key point of the high-voltage generator is the uniformity of an insulation system of a high-voltage part, the structure starts from insulating paint, a mica tape with less glue and an electromagnetic wire, the insulation system which is subjected to UL certification is adopted, and the optimal matching performance and reliability can be obtained under the condition that components are mutually compatible;

2. this structure all adopts few gluey vacuum pressure dip coating to handle, and the wholeness of high-pressure stator part is good, and insulating quality is stable, and the stator core inslot is zero clearance fit between with high-voltage coil, reduces the product and the probability that voltage difference and corona layer appear under 4500 ability of honour elevation 5000m environment, ensures the insulating reliability of high-quality of high-voltage stator coil.

Drawings

The present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic plan view of the present invention;

FIG. 2 is a schematic cross-sectional view of the insulation of the middle lead wire according to the present invention;

FIG. 3 is a schematic cross-sectional view of the middle insulation structure of the present invention;

fig. 4 is a schematic sectional structure diagram of the main insulator of the present invention.

In the figure: 1. bare copper wire; 11. a self-adhesive imine film; 12. interturn mica tape; 13. single-side glass cloth mica tape with less glue; 14. reinforcing the mica tape with less glue powder by using an imine film; 2. lead insulation; 21. glass cloth mica tape with less glue; 22. a glass ribbon; 3. end insulation; 31. a medium resistance anti-corona band; 32. high resistance anti-halation tape; 33. a breathable protective belt; 4. main insulation; 41. low resistance corona prevention tape.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

As shown in FIG. 1, one of the insulating structures of the utility model is suitable for a 5km high-voltage generator at sea level, the occurrence of corona on the high-voltage coil winding of the generator stator is an important sign of the aging of the generator insulation, the reason for the occurrence of corona on the high-voltage coil winding of the generator is that some parts of the insulating surface of the high-voltage coil winding of the generator stator are too strong to cause ionization of air nearby due to uneven electric field distribution and too strong local field strength, and the resulting glow discharge is generated on the insulating surface, compared with other forms of local discharge, the discharge strength of corona itself is not very high, but the existence of corona greatly reduces the performance of the insulating material, and at the same time, it is recognized that under high-altitude environment, the probability of corona occurrence is higher, the higher the sea level is, the air is thinner, the corona discharge voltage is lower, thereby the service life of the generator is greatly reduced, based on this special use environment, after long-time groping and experiments, the technical personnel creatively use the structure to achieve the aim of long-time and high-quality operation of the high-voltage generator under the high-altitude conditions of 4500-.

As shown in figure 1, the corona-proof insulation structure suitable for the 5km high-voltage generator comprises a stator and a coil winding embedded between stator slots, wherein the coil winding consists of a rectangular bare copper wire 1, a lead insulation 2 wrapped at different positions outside the bare copper wire 1, an end insulation 3 and a main insulation 4, the three are of a laminated structure, as shown in figure 2, a self-adhesive imine film 11 and an interturn mica tape 12 are sequentially wrapped outside the bare copper wire 1 along the radial direction of the bare copper wire, the lead insulation 2 comprises a glass cloth mica tape 21 and a glass silk tape 22 which are arranged outside the bare copper wire 1, as shown in figure 3, the end insulation 3 comprises a single-sided glass cloth mica tape 13, an imine film reinforced mica tape 14, a medium-resistance corona-proof tape 31, a high-resistance corona-proof tape 32 and a breathable protective tape 33 which are arranged outside the bare copper wire 1, as shown in figure 4, and the main insulation 4 comprises a single-sided glass cloth mica tape 13, a low-adhesion tape 13, a low-resistance mica tape 14, a medium-resistance corona-proof tape 31, a high-resistance corona-resistance tape 32 and a breathable protective tape 33 which are arranged outside the bare copper wire 1, In the structure, a lead insulation 2, an end insulation 3 and a main insulation 4 are dipped in H-level insulation resin once according to the VPI rule after the wiring is finished and a voltage-withstanding test is finished, the surfaces of the lead insulation 2, the end insulation 3 and the main insulation 4 are subjected to drying treatment and then are subjected to less-glue vacuum pressure dip coating treatment, and the insulation structure subjected to less-glue vacuum pressure dip coating treatment has the advantages of good integrity and stable insulation quality of a high-voltage stator coil winding, and meanwhile, the stator core slot and the high-voltage coil are in gapless fit, so that the probability of voltage difference and a corona layer of a product in the 4500 plus 5000m high altitude environment is reduced, and the reliability of high-quality insulation of the high-voltage stator coil winding is ensured.

As shown in fig. 2, 3 and 4, the self-adhesive imine film 11 and the turn-to-turn mica tape 12 are wrapped outside the bare copper wire 1 in a half-lap wrapping manner, and the three are combined to form an electromagnetic wire, so that compared with a traditional insulation structure, a first layer of turn-to-turn insulation is formed, and a lead insulation 2, an end insulation 3 and a main insulation 4 are respectively wrapped on the basis of the first layer of insulation, so that the insulation capacity of the structure under the condition of high altitude is improved, and the occurrence probability of corona is greatly reduced.

As shown in fig. 3 and 4, a plurality of layers of single-sided glass cloth dry mica tapes 13 and a plurality of layers of imine thin film reinforced dry mica tapes 14 are sequentially wound on the outer corresponding end insulation 3 and main insulation 4 of the electromagnetic wire, in the embodiment, the imine thin film reinforced dry mica tapes 14 are selected from H-grade imine thin film reinforced dry mica tapes, the specification of the single-sided glass cloth dry mica tapes 13 is 0.13mm × 25mm, both are wrapped on the outer part of the electromagnetic wire in a half-lap wrapping manner, i.e. the half-lap wrapping is performed on the outer part of the electromagnetic wire during winding, at the position corresponding to the main insulation 4, the single-sided glass cloth dry mica tapes 13 are firstly wound on the outer part of the electromagnetic wire by the half-lap wrapping manner for 4 layers, then the imine thin film reinforced dry mica tapes 14 are wound on the outer part of the single-sided glass cloth dry mica tapes 13 by the half-lap wrapping manner for 5 layers, the total number of mixed layers is 9, thereby achieving the best implementation effect, and at the position corresponding to the end insulation 3, a single-sided glass cloth mica tape 13 is wrapped on the outer part of the electromagnetic wire by 4 layers in a half-lap wrapping mode, then an imine film reinforced mica tape 14 is wrapped on the outer part of the single-sided glass cloth mica tape 13 by 4 layers in a half-lap wrapping mode, and the total number of the mixed wrapping layers is 8, so that the best implementation effect is achieved, and the best insulation capability is obtained.

As shown in fig. 4, the low-resistance corona-proof tape 41 is wrapped around the outside of the imine film reinforced low-gelatine mica tape 14 corresponding to the main insulation 4 in a lap-wrapping manner, in this embodiment, the low-resistance corona-proof tape 41 has a specification of 0.08mm × 25mm, and the low-resistance corona-proof tape 41 formed in a 2mm lap-wrapping manner can obtain a better corona resistance.

As shown in fig. 3, a middle resistance corona-proof tape 31 and a high resistance corona-proof tape 32 are sequentially wound at the position, corresponding to the end insulation 3, outside the imine film reinforced low-gelatine mica powder tape 14, in this embodiment, the specification of the high resistance corona-proof tape 32 is 0.20mm × 25mm, the overlapping size of the high resistance corona-proof tape 32 and the low resistance corona-proof tape 41 is 20mm-25mm, a 0.09mm × 25mm breathable protective tape 33 is wound outside the high resistance corona-proof tape 32 in a half-lap wrapping manner, a polyester felt is padded at the joint of the end insulation 3 and the lead insulation 2, and the best matching performance and reliability can be obtained under the condition that the parts are compatible with each other by using a better and more reliable UL certified insulation system with better matching performance.

As shown in fig. 2, a glass cloth dry mica tape 21 and a glass ribbon 22 are sequentially wrapped at a position, corresponding to the lead insulation 2, outside the interturn mica tape 12, in the present embodiment, the specification of the glass cloth dry mica tape 21 is 0.13mm × 25mm, and after a test, the glass cloth dry mica tape 21 is wrapped around the outside of the electromagnetic wire by 8 layers in a half-lap wrapping manner, and the glass ribbon 22 with the specification of 0.1mm × 25mm is wrapped by one layer, so that an optimal insulation effect can be achieved.

The utility model discloses structure among the technical scheme all adopts few gluey vacuum pressure dip coating to handle, and the wholeness of high-pressure stator part is good, and insulating quality is stable, for zero clearance fit between stator core inslot and the high-tension coil, reduces the product and appears the probability on voltage difference and corona layer under 4500 + 5000m high altitude environment to ensure the insulating reliability of high-pressure stator coil high-quality.

According to GB/T20833-2007 measuring method and evaluation guide rule of partial discharge of stator bar and winding of rotating electrical machine; GB/T22715-2008/IEC 60034-15:1995 alternating current motor stator forming coil impact-resistant voltage level; and testing the corona-proof insulation structure of the high-voltage motor stator coil winding according to the standards such as the technical conditions of the JB/T12685-2016 high-voltage motor stator coil and the like, wherein the test results are in the standard qualified range.

Above-mentioned corona structure technical scheme's setting is prevented to high pressure, can realize that the stator coil does not produce the corona at 27000V withstand voltage lower coil surface when height above sea level 4500M, and the stator coil does not produce the corona at 30000V withstand voltage lower coil surface when height above sea level 5000M, promptly the utility model discloses technical scheme's generator can be exclusively used in 4500 + 5000M high height above sea level area, ambient temperature-40 ℃ - +55 ℃, high-power electricity generation of high pressure 10000V.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only, and various modifications, additions and substitutions as described for the specific embodiments described herein may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.

Claims

1. The utility model provides an anti corona insulation system suitable for 5km high-voltage generator, includes the stator and imbeds the coil winding between the stator groove, the coil winding comprises the bare copper line (1) of rectangle and lead wire insulation (2), tip insulation (3) and main insulation (4) around wrapping in its outside different positions, and the three is laminated structure, its characterized in that, the outside of bare copper line (1) is wrapped in proper order along its radial has autohension imine film (11) and turn-to-turn mica tape (12), lead wire insulation (2) is including setting up glass cloth few glue mica tape (21) and glass silk tape (22) outside bare copper line (1), tip insulation (3) are including setting up single face glass cloth few glue tape (13), the few glue tape of imine film reinforcement (14), well electric resistance anti corona tape (31) outside bare copper line (1), The main insulation (4) comprises a single-sided glass cloth dry mica tape (13), an imine film reinforced dry mica tape (14) and a low-resistance corona-proof tape (41) which are arranged outside the bare copper wire (1).

2. The corona-proof insulation structure for 5km high-voltage generator according to claim 1, wherein the self-adhesive imine film (11) and the interturn mica tape (12) are wrapped on the outside of the bare copper wire (1) in a half-lap wrapping manner, and the three are combined to form an electromagnetic wire.

3. The corona-proof insulation structure suitable for the 5km high-voltage generator according to claim 2, wherein a plurality of layers of the single-sided glass cloth dry mica tape (13) and a plurality of layers of the imine film reinforced dry mica tape (14) are sequentially wrapped outside the electromagnetic wire corresponding to the positions of the end insulation (3) and the main insulation (4), the two layers are wrapped outside the electromagnetic wire in a half-lap wrapping manner, and the two layers are overlapped in a mixed wrapping manner.

4. The corona-proof insulation structure suitable for 5km high-voltage generator according to claim 3, wherein the outer portion of the imine film reinforced dry mica tape (14) is wrapped with a low-resistance corona-proof tape (41) in a lap-wrapping manner at a position corresponding to the main insulation (4).

5. The corona-proof insulation structure suitable for the 5km high-voltage generator according to claim 3, wherein the positions of the outer part of the imine film reinforced dry mica tape (14) corresponding to the end insulation (3) are sequentially wrapped with a medium-resistance corona-proof tape (31) and a high-resistance corona-proof tape (32), and the outer part of the high-resistance corona-proof tape (32) is wrapped with a ventilation protective tape (33) in a half-lap wrapping manner.

6. The corona-proof insulation structure for a 5km high-voltage generator according to claim 5, wherein the connection part of the end insulation (3) and the lead insulation (2) is wrapped with polyester felt in an overlapping manner.

7. The corona-proof insulation structure for a 5km high-voltage generator according to claim 1, wherein the mica tape (21) and the glass fiber tape (22) are wrapped around the exterior of the interturn mica tape (12) in sequence corresponding to the lead insulation (2).

8. The corona-proof insulating structure for 5km high-voltage generator according to any of claims 1-7, wherein the lead insulation (2), the end insulation (3) and the main insulation (4) are dipped in H-class insulating resin once according to VPI as a rule after the wiring and the voltage resistance test, and the surfaces of the three are dried and then treated by using less-glue vacuum pressure dipping paint.