CN208506209U - A kind of Wind turbines shaft voltage testing tool - Google Patents
A kind of Wind turbines shaft voltage testing tool Download PDFInfo
- Publication number
- CN208506209U CN208506209U CN201820991241.0U CN201820991241U CN208506209U CN 208506209 U CN208506209 U CN 208506209U CN 201820991241 U CN201820991241 U CN 201820991241U CN 208506209 U CN208506209 U CN 208506209U
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- China
- Prior art keywords
- shaft voltage
- conductive contact
- wind turbines
- testing tool
- voltage testing
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- 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.)
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Abstract
The utility model discloses a kind of Wind turbines shaft voltage testing tools, including holding insulating bar, the hand-held insulating bar front end is provided with the conductive contact for contacting with generator shaft, there are two conductive contacts for setting on the conductive contact, for connecting with wave tracer, second conductive contact is used to connect with the earth or electric generator casing first conductive contact.The Wind turbines shaft voltage testing tool of the utility model, it is contacted by conductive contact with generator shaft, the shaft voltage amplitude of generator is passed in wave tracer, therefore the tool can measure the amplitude of Wind turbines shaft voltage under different operating conditions, the function of realizing real-time, accurate, safe measurement generator shaft voltage, is suitable for popularization and application.
Description
Technical field
The utility model relates to technical field of wind power, more particularly to a kind of Wind turbines shaft voltage testing tool.
Background technique
Typical three phase sine power supply is balance, i.e. the vector sum of three-phase is always equal to zero.Since there are humorous for PWM power supply
Wave causes the voltage of neutral point not equal to zero, this voltage so the vector sum of the three-phase output voltage of PWM power supply is not zero
It is defined as common-mode voltage.Shaft voltage be common-mode voltage by the coupling of motor parasitic capacitance as a result, its essence be common mode electricity
The one-component of pressure.
Shaft voltage can be induced on the motor of PWM converter driving, on the generator that bearing does not use insulation measures,
The interior snare of bearing is on axis, inner ring and axis equipotential；Bearing outer ring is connected with generator's cover, and end cap is fixed on base
On, and base is connected or is directly grounded with system zero-potential point, at this point, foring potential difference between the Internal and external cycle of bearing.Profit
Lubricating oil can generate oil film during bearing rotary, when being formed by the voltage of parasitic capacitance higher than the voltage that oil film can be born,
Oil film is breakdown, and electric discharge is connected by minimum breakdown point in the charge stored in parasitic capacitance, small on raceway surface
High current density is generated on metal covering, moment generates high heat, enough by the metal molten of point of discharge, forms electricity
Erosion, reduces the finish of roller surface.With the continuous accumulation of discharge process, macroscopic washboard-like is gradually appeared on bearing
Lines, raceway face is coarse to can't bear, and increases the abrasion of bearing and vibration, eventually leads to bearing and thoroughly damage.Therefore shaft voltage
Be cause generator bearing damage, reduced service life the main reason for one of.
Currently, motor manufacturer is in order to reduce the influence of shaft voltage, it is desirable that carry out electricity to generator bearing before factory
Gas Insulation test, mainly has: bearing insulation resistance test (1000V, > 11G Ω), the test of bearing DC break down voltage: 2500V, 1min,
Do not puncture, but these tests are off-line test, i.e., the value measured when generator is in shutdown status, due to power generation
The factor that machine influences shaft voltage under stationary state and rotation status differs greatly, therefore generator measures under static state
Value, it cannot be guaranteed that generator insulate under rotation status also complies with requirement.Therefore need a kind of test equipment that can measure power generation
The value of machine shaft voltage under operation.
Utility model content
The technical problem to be solved by the present invention is to provide one kind can in real time, accurate, security measurement generator running
The Wind turbines shaft voltage testing tool of the value of shaft voltage under state, so that existing shaft voltage test be overcome to be only capable of off-line test
Deficiency.
In order to solve the above technical problems, the utility model adopts the following technical solution:
A kind of Wind turbines shaft voltage testing tool, including hand-held insulating bar, the hand-held insulating bar front end setting are useful
In setting on the conductive contact contacted with generator shaft, the conductive contact, there are two conductive contacts, first conduction to connect
For connecting with wave tracer, second conductive contact is used to connect with the earth or electric generator casing head.
It is further improved as the utility model, the conductive contact is copper contact.
Further, the contact jaw of the conductive contact is spherical surface.
Further, the conductive contact is copper sleeve.
Further, described two conductive contacts are convex, and the two sides of conductive contact are arranged in.
Further, the end of the conductive contact of the convex is spherical.
Further, the hand-held insulating bar include insulate the body of rod and positioned at insulation body of rod tail portion insulated handle, it is described
The diameter of the insulation body of rod is less than the diameter of insulated handle.
Further, the hand-held insulating bar is cylindrical.
It further, further include wave tracer, first conductive contact is connect with wave tracer by conducting wire.
Further, the connecting pin of the conducting wire and the first conductive contact is clip like.
By using above-mentioned technical proposal, the utility model at least has the following advantages:
1, the Wind turbines shaft voltage testing tool of the utility model, is contacted by conductive contact with generator shaft, will
The shaft voltage amplitude of generator is passed in wave tracer, therefore the tool can measure wind-driven generator in different operating condition lower axles
The amplitude of voltage；Realize the function of real-time, accurate, safe measurement generator shaft voltage.
2, the Wind turbines shaft voltage testing tool of the utility model is furtherd investigate shaft voltage (electric current) for wind power plant and is provided
Technical foundation.Such as, the shaft voltage that can detecte first when generator is run in the case of being fitted without grounding carbon brush is horizontal, is used to
Judge whether generator insulating is good.Secondly, can detecte shaft voltage water when generator in the case of installation grounding carbon brush is run
It is flat, to judge whether bearing is grounded carbon brush protection.Shaft voltage when can install different braking measures by measuring again subtracts
Determine optimal shaft voltage braking measure scheme by a small margin.
Detailed description of the invention
Above-mentioned is only the general introduction of technical solutions of the utility model, in order to better understand the technology hand of the utility model
Section, below in conjunction with attached drawing, the utility model is described in further detail with specific embodiment.
Fig. 1 is the structure principle chart of the Wind turbines shaft voltage testing tool of an embodiment of the present invention
Fig. 2 is the structure principle chart of the Wind turbines shaft voltage testing tool of another embodiment of the utility model.
Specific embodiment
As shown in Figure 1, a kind of Wind turbines shaft voltage testing tool is present embodiments provided, including hand-held insulating bar 1,
Electric current flowing can be prevented, person's personal safety that protection holds bar；Hand-held 1 front end of insulating bar is provided with for contacting with generator shaft
Conductive contact 2, can measure the amplitude of generator shaft voltage at runtime, there are two conductive contacts for setting on conductive contact 2
3, the first conductive contact 31 can show real-time shaft voltage variation, the second conductive contact 32 is used for connecting with wave tracer
It is connect in the earth or electric generator casing, it is ensured that instrument ground precise measurement.
Using the preparation before the test of above-mentioned shaft voltage testing tool are as follows: firstly, by the first conductive contact 31 and waveform
Recorder 4 connects, and wherein waveform recording can be used as a part of testing tool, complete sale (shown in Figure 2), can also be with
Use the existing wave tracer of wind power plant；Secondly, the second conductive contact 32 is passed through, conducting wire is connect with the earth or second leads
Electric connection 32 can also be connect by conducting wire with electric generator casing.
After the completion of connection, tester stands in wind turbine cabin, hand-held insulating bar 1 is held, by hand-held insulating bar 1
The conductive contact 2 of front end is contacted with the generator shaft under rotation status, and conductive contact 2 excessively is contacted with generator shaft, can be incited somebody to action
The shaft voltage amplitude of generator is passed in wave tracer, therefore the tool can measure Wind turbines in different operating condition lower axle electricity
The amplitude of pressure；Realize the function of real-time, accurate, safe measurement generator shaft voltage.
Above-mentioned Wind turbines shaft voltage testing tool, wherein any material with conducting function can be used in conductive contact 2
Matter, such as copper contact or iron contact, but angularly from economy and wearability, preferred copper contact.
Arbitrary shape can be used in the contact jaw of above-mentioned conductive contact 2, but in order to guarantee the smooth engagement with generator shaft,
The contact jaw of preferred conductive contact is spherical surface.
Any material with conducting function can also be used in above-mentioned conductive contact 3 in principle, can such as connect for copper sleeve or iron
Head etc., but from economic or practical standpoint, preferably copper sleeve.
Above-mentioned two conductive contact 3 can be set to any joint geometry, but connect for convenience, be preferably all protrusion
Shape is symmetricly set on the two sides of conductive contact 2, it is highly preferred that the end of the conductive contact 3 of convex is set as spherical, it is convenient
It is connect with the clip of external wire termination.
Above-mentioned hand-held insulating bar 1 includes the insulation body of rod 11 and the insulated handle 12 positioned at insulation 11 tail portion of the body of rod, and insulate hand
The setting of handle holds testing tool convenient for the person that holds bar and stable contacts its with generator shaft.The diameter of the insulation body of rod 11 is small
In the diameter of insulated handle 12, this kind setting can save insulation rod body material, light, convenience is held.Preferably, it holds exhausted
Edge bar 2 is cylindrical.
The utility model can only use the defect of off-line test for the test of existing Wind turbines shaft voltage, provide one kind
The Wind turbines shaft voltage testing tool tested under running of wind generating set state may be implemented, realize it is real-time, accurate,
The function of the measurement generator shaft voltage of safety.At the same time it can also be made the following judgment using above-mentioned tool:
1, the shaft voltage that can detecte when generator is run in the case of being fitted without grounding carbon brush is horizontal, for judging to generate electricity
Whether machine insulation is good.
2, the shaft voltage that can detecte when generator in the case of installation grounding carbon brush is run is horizontal, with judge bearing whether by
Grounding carbon brush protection.
3, shaft voltage when can install different braking measures by measuring reduces amplitude to determine that optimal shaft voltage presses down
Measure scheme processed.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation, those skilled in the art make a little simple modification, equivalent variations or modification using the technology contents of the disclosure above,
It falls within the protection scope of the present utility model.
Claims (10)
1. a kind of Wind turbines shaft voltage testing tool, which is characterized in that including holding insulating bar, the hand-held insulating bar front end
It is provided with the conductive contact for contacting with generator shaft, setting is there are two conductive contact on the conductive contact, and described the
For connecting with wave tracer, second conductive contact is used to connect with the earth or electric generator casing one conductive contact.
2. Wind turbines shaft voltage testing tool according to claim 1, which is characterized in that the conductive contact is copper touching
Head.
3. Wind turbines shaft voltage testing tool according to claim 1, which is characterized in that the contact of the conductive contact
End is spherical surface.
4. Wind turbines shaft voltage testing tool according to claim 1, which is characterized in that the conductive contact connects for copper
Head.
5. Wind turbines shaft voltage testing tool according to claim 1, which is characterized in that described two conductive contacts are equal
For convex, the two sides of conductive contact are set.
6. Wind turbines shaft voltage testing tool according to claim 5, which is characterized in that the conduction of the convex connects
The end of head is spherical.
7. Wind turbines shaft voltage testing tool according to claim 1, which is characterized in that the hand-held insulating bar includes
Insulate the body of rod and the insulated handle positioned at insulation body of rod tail portion, and the diameter of the insulation body of rod is less than the diameter of insulated handle.
8. Wind turbines shaft voltage testing tool according to claim 1, which is characterized in that the hand-held insulating bar is in circle
Column.
9. Wind turbines shaft voltage testing tool according to claim 1-8, which is characterized in that further include waveform
Recorder, first conductive contact are connect with wave tracer by conducting wire.
10. Wind turbines shaft voltage testing tool according to claim 9, which is characterized in that the conducting wire is led with first
The connecting pin of electric connection is clip like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820991241.0U CN208506209U (en) | 2018-06-26 | 2018-06-26 | A kind of Wind turbines shaft voltage testing tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820991241.0U CN208506209U (en) | 2018-06-26 | 2018-06-26 | A kind of Wind turbines shaft voltage testing tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208506209U true CN208506209U (en) | 2019-02-15 |
Family
ID=65281231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820991241.0U Expired - Fee Related CN208506209U (en) | 2018-06-26 | 2018-06-26 | A kind of Wind turbines shaft voltage testing tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208506209U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514902A (en) * | 2019-09-05 | 2019-11-29 | 中广核核电运营有限公司 | Generator excitation watt insulator resistor detecting device |
| CN111856085A (en) * | 2020-07-24 | 2020-10-30 | 国网湖北省电力有限公司鄂州供电公司 | Power supply station voltage detection device |
-
2018
- 2018-06-26 CN CN201820991241.0U patent/CN208506209U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514902A (en) * | 2019-09-05 | 2019-11-29 | 中广核核电运营有限公司 | Generator excitation watt insulator resistor detecting device |
| CN110514902B (en) * | 2019-09-05 | 2021-12-24 | 中广核核电运营有限公司 | Generator excitation shoe insulator resistance detection device |
| CN111856085A (en) * | 2020-07-24 | 2020-10-30 | 国网湖北省电力有限公司鄂州供电公司 | Power supply station voltage detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190215 Termination date: 20210626 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |