CN211481055U - Double-fed wind turbine generator system drive end grounding device - Google Patents
Double-fed wind turbine generator system drive end grounding device Download PDFInfo
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- CN211481055U CN211481055U CN202020324168.9U CN202020324168U CN211481055U CN 211481055 U CN211481055 U CN 211481055U CN 202020324168 U CN202020324168 U CN 202020324168U CN 211481055 U CN211481055 U CN 211481055U
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Abstract
The utility model provides a doubly-fed formula wind turbine generator system drive end earthing device, including ground connection carbon brush subassembly, ground connection copper line, ground ring installs additional on generator shaft drive end is epaxial, ground connection carbon brush subassembly includes carbon brush support, brush holder, carbon brush, elastic component, the brush holder is fixed through installing the carbon brush support on generator drive end casing and ground ring, the brush holder is connected the elastic component and is installed on ground connection copper line through this elastomer fixed mounting, the carbon brush is installed in the brush holder, the carbon brush presses the outer peripheral face of touching in the generator drive end under the elastic action of elastic component. Install at the drive end on prior art is generator non-drive end installed earthing device's basis promptly the utility model discloses, the ground connection brush combines ground connection copper line, ground ring, is showing the clamp system effect that improves counter shaft voltage, and the effect of prevention axle current is showing, has ensured generating set's good operation, has effectively promoted the safe operation level in wind-powered electricity generation field.
Description
Technical Field
The utility model belongs to the technical field of wind turbine generator electricity generator collecting ring installation appurtenance, concretely relates to doubly-fed formula wind turbine generator system drive end earthing device.
Background
In the operation process of the double-fed wind turbine generator, the rotor forms shaft voltage due to electromagnetic induction. The shaft voltage refers to the voltage generated between two bearing ends of the motor or between the rotating shaft of the motor and the bearings when the motor runs. Under normal conditions, when the shaft voltage is lower, a lubricating oil film between the rotating shaft of the generator and the bearing can play a good insulating role. When the shaft voltage rises to a certain extent, it can break down grease to form a shaft current. The shaft current can not only destroy the stability of an oil film and gradually degrade the lubricated and cooled oil (blacken and block sticking), but also generate high temperature in a moment to cause the local part of the bearing (the temperature is increased) because the shaft current passes through a small metal contact point from the metal contact point of the bearing and the rotating shaft and the current density is high. The fused bearing alloy splashes under the action of rolling force, and small pits are burnt on the inner surface of the bearing and the outer surface of the rotating shaft. Finally, the bearing is damaged due to accelerated mechanical wear, and a bearing retainer is burnt out in severe cases, so that the problems of adhesion between the bearing and a rotating shaft and the like are caused, and the unit is forced to stop running.
In the unit in the prior art, a layer of insulating plate (or an electric insulating bearing) is additionally arranged between a bearing and a bearing seat to block the current circulation of a shaft, and meanwhile, a grounding carbon brush is additionally arranged on a rotating shaft to eliminate the shaft voltage in time. At present, the non-drive end of a generator of a wind power plant adopts an insulating bearing, the drive end adopts a non-insulating bearing, and a grounding carbon brush is additionally arranged at the non-drive end of the generator of the wind power plant to eliminate shaft current, for example, the patent number ZL201521062404.X is named as a non-drive end grounding structure of a wind driven generator, and the high-conductivity carbon brush is directly contacted with a rotating shaft of the non-drive end of the generator, so that the grounding effect is better, the generation probability of damage to a generator transmission system and a frequency converter caused by the rotor shaft current is reduced, and. However, in terms of the operation condition of the existing unit, because the wind driven generator is subjected to large vibration in the operation process, the shaft current cannot be well eliminated by only depending on the group of grounding carbon brushes at the non-driving end, and therefore, the events of bearing damage, rotating shaft abrasion and rotating shaft corrosion still occur occasionally.
Disclosure of Invention
To the above-mentioned technical problem in the background art, the utility model provides a doubly-fed formula wind turbine generator system drive end earthing device further improves the effect of the clamp system to generator shaft voltage, has effectively promoted the safe operation level in wind-powered electricity generation field.
The technical scheme of the utility model is that: the utility model provides a double-fed formula wind turbine generator system drive end earthing device, includes ground connection carbon brush subassembly, ground connection copper line, ground ring installs additional on generator shaft drive end is epaxial, ground connection carbon brush subassembly includes carbon brush support, brush holder, carbon brush, elastic component, the brush holder is fixed through installing the carbon brush support on generator drive end casing and ground ring, brush holder connection elastic component and through this elastomer fixed mounting on ground connection copper line, the carbon brush is installed in the brush holder, the carbon brush pushes down the outer peripheral face that touches in the generator drive end under the elastic action of elastic component.
And in a scheme, the brush holder is also provided with a microswitch, and the microswitch is connected with a fan master control system through a wire.
The scheme is further that the grounding ring is made of the same material as the generator driving end shaft, and the grounding ring is tightly arranged on the circumference of the generator driving end.
The scheme is further that the grounding carbon brush assembly is installed on the circumference of a driving end shaft of the generator in a double-splicing mode.
Further, the elastic member is an adjustable compression spring, and the pressure of the compression spring is 200 and 300 CN/CM.
The utility model has the advantages that: on the basis of the ground structure of non-drive end additional installation of prior art, combine the utility model discloses the earthing device of drive end additional installation, install the ground ring additional and improve the effect of the system of pincers to generator shaft voltage, install the ground connection copper line additional, area of contact increases, do not receive the influence of vibration, multiple spot contact, the operation is less by the influence of greasy dirt and vibration, and the effect of the system of pincers to shaft voltage is also more obvious, the effect of prevention axle current is showing, generator set's good operation has been ensured, the safe operation level in wind-powered electricity generation field has effectively been promoted, the micro-gap switch monitoring carbon brush length that sets up on the brush holder, alarm signal inserts fan major control system, realize real-time on-the-spot monitoring.
Drawings
Fig. 1 is a front view of a structure of a double-fed wind turbine generator driving end grounding device of the present invention;
fig. 2 is a left side view of the structure of the grounding device at the driving end of the doubly-fed wind turbine generator set of the present invention;
fig. 3 is a schematic view of the installation of the micro-switch of the grounding device at the driving end of the doubly-fed wind turbine generator of the present invention;
wherein: 1. the fan comprises a grounding carbon brush assembly, 2, a grounding ring, 3, a grounding copper wire, 4, a carbon brush support, 5, a brush holder, 6, a carbon brush, 7, a microswitch and 8 and a fan main control system.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which a person skilled in the art can, without any creative effort, fully implement the present invention.
The utility model discloses a concrete implementation mode is: as shown in fig. 1-3, a double-fed wind turbine generator drive end grounding device includes a grounding carbon brush assembly 1, a grounding copper wire 3, and a grounding ring 2, the grounding ring 2 is installed on a generator shaft drive end shaft, the grounding carbon brush assembly 1 includes a carbon brush support 4, a brush holder 5, a carbon brush 6, and an elastic member, the brush holder 5 is fixed by the carbon brush support 4 installed on a generator drive end housing and the grounding ring 2, the brush holder 5 is connected with the elastic member and is fixedly installed on the grounding copper wire 3 through the elastic member, the carbon brush 6 is installed in the brush holder 5, and the carbon brush 6 is pressed and contacted with the outer peripheral surface of the generator drive end under the elastic action of the elastic member.
The embodiment of the utility model provides a furtherly, still install micro-gap switch 7 on the brush holder 5, micro-gap switch 7 passes through the wire and is connected with fan major control system 8, and real-time supervision carbon brush length provides the foundation for the on-the-spot maintenance.
The embodiment of the utility model provides a furtherly, ground ring 2 is unanimous with generator drive end shaft material, and ground ring 2 zonulae occludens is at generator drive end circumference, and ground ring 2's thickness is not less than 8mm, and the width is not less than 20mm (according to on-the-spot actual adjustment), can guarantee in close contact with between ground ring 2 and the generator drive end shaft, can not have any not hard up between ground ring 2 and the generator drive end shaft, and the anchor ring runout value should be less than 5 silks after ground ring 2 installs, and ring roughness is at Ra0.8-1.6.
The embodiment of the utility model provides a further, ground connection carbon brush subassembly 1 is installed on generator drive end axle circumference with the form of double pin.
The embodiment of the utility model provides a further, the elastic component is adjustable pressure spring, and the pressure of pressure spring is 200 and 300 CN/CM.
The generator shaft voltage is tested in the following three ways respectively under the conditions of rated voltage and rated frequency no-load state:
1. and the driving end and the non-driving end are not provided with grounding devices, and a millivoltmeter is used for testing the voltage to ground of the driving end shaft, the voltage to ground of the non-driving end shaft and the voltage of the driving end to the non-driving end shaft respectively, wherein the tested values are 2100mv, 2500mv and 2480mv respectively.
2. And a grounding device is additionally arranged at the non-driving end, the grounding device is not additionally arranged at the driving end, and a millivoltmeter is used for respectively testing the voltage to the ground of the driving end shaft, the voltage to the ground of the non-driving end shaft and the voltage of the driving end shaft to the non-driving end shaft, wherein the tested values are 900mv, 1050mv and 1120mv respectively.
3. And a grounding device is additionally arranged at the driving end and the non-driving end, and a millivoltmeter is used for respectively testing the voltage to ground of the driving end shaft, the voltage to ground of the non-driving end shaft and the voltage of the driving end to the non-driving end shaft, and the voltage test values of the three shafts in the mode are greatly reduced and are respectively 44.1mv, 43.2mv and 39.6 mv.
Through experimental test result analysis, install at the drive end on prior art is generator non-drive end installed earthing device's basis promptly the utility model discloses, the ground connection brush combines ground connection copper line, ground ring, is showing the clamping effect that improves counter shaft voltage, and the effect of prevention axle current is showing, has ensured generating set's good operation, has effectively promoted the safe operation level in wind-powered electricity generation field.
While the preferred embodiments of the present invention have been described, it is to be understood that the invention is not limited to the precise embodiments described, and that equipment and structures not described in detail are understood to be practiced as commonly known in the art; any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention will still fall within the protection scope of the technical solution of the present invention by those skilled in the art without departing from the technical solution of the present invention.
Claims (5)
1. The utility model provides a double-fed formula wind turbine generator system drive end earthing device, its characterized in that includes ground connection carbon brush subassembly, ground connection copper line, ground ring installs additional on generator shaft drive end is epaxial, ground connection carbon brush subassembly includes carbon brush support, brush holder, carbon brush, elastic component, the brush holder is fixed through installing the carbon brush support on generator drive end casing and ground ring, brush holder connection elastic component and through this elastomer fixed mounting on ground connection copper line, the carbon brush is installed in the brush holder, the carbon brush is in the outer peripheral face of generator drive end of pressure touch under the elastic action of elastic component.
2. The grounding device for the driving end of the doubly-fed wind turbine generator set according to claim 1, wherein a microswitch is further installed on the brush holder, and the microswitch is connected with a fan main control system through a wire.
3. The double-fed wind turbine generator driving end grounding device according to claim 2, wherein the grounding ring is made of the same material as the generator driving end shaft, and the grounding ring is tightly installed on the circumference of the generator driving end.
4. The double-fed wind turbine generator driving end grounding device according to claim 3, wherein the grounding carbon brush assembly is installed on the circumference of the generator driving end shaft in a double-split mode.
5. The grounding device for the driving end of the doubly-fed wind turbine generator set as claimed in claim 4, wherein the elastic member is an adjustable compression spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020324168.9U CN211481055U (en) | 2020-03-16 | 2020-03-16 | Double-fed wind turbine generator system drive end grounding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020324168.9U CN211481055U (en) | 2020-03-16 | 2020-03-16 | Double-fed wind turbine generator system drive end grounding device |
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| CN211481055U true CN211481055U (en) | 2020-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020324168.9U Active CN211481055U (en) | 2020-03-16 | 2020-03-16 | Double-fed wind turbine generator system drive end grounding device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234742A (en) * | 2020-10-26 | 2021-01-15 | 山东齐鲁电机制造有限公司 | Take RC earthing device's turbo generator brush support and supporting axle head thereof |
-
2020
- 2020-03-16 CN CN202020324168.9U patent/CN211481055U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234742A (en) * | 2020-10-26 | 2021-01-15 | 山东齐鲁电机制造有限公司 | Take RC earthing device's turbo generator brush support and supporting axle head thereof |
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