CN204925215U - On line measurement device of generator shaft voltage among measurement wind turbine generator system - Google Patents
On line measurement device of generator shaft voltage among measurement wind turbine generator system Download PDFInfo
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- CN204925215U CN204925215U CN201520563943.5U CN201520563943U CN204925215U CN 204925215 U CN204925215 U CN 204925215U CN 201520563943 U CN201520563943 U CN 201520563943U CN 204925215 U CN204925215 U CN 204925215U
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Abstract
The utility model discloses an on line measurement device of generator shaft voltage among measurement wind turbine generator system, test wire and the insulated handle be connected including the conductor, with the conductor, the conductor is soft copper conductor. The utility model discloses a soft copper conductor contacts with the power generator shaft who is incorporated into the power networks down to through the safety protection of insulated handle, realization on line measurement generator that can be safe, the simple and convenient axle voltage level under being incorporated into the power networks, existing effect has ensured tester's electrical safety and mechanical safety, has improved the degree of accuracy of insulating properties test under the bearing running state again. The utility model discloses the test of in use through to ground connection carbon brush fore -and -after generator shaft voltage, the service condition that can more objective accurate reflection be incorporated into the power networks issues motor bearing's the insulating properties and the validity protective properties of ground connection carbon brush.
Description
Technical field
The utility model relates to the technical field measuring Wind turbines generator shaft voltage, particularly relates to a kind of on-line measurement device measuring generator shaft voltage in Wind turbines.
Background technology
Owing to finding when carrying out bearing damage investigation in certain wind energy turbine set, there is EDM (electrosparking) effect in most bearing, on raceway, namely has obvious rough washboard vestige, and tracing it to its cause is caused by generator shaft electric current.
In Double-feed wind power unit, generator shaft electric current is mainly because rotor-side variable frequency device is that the high frequency common mode voltage that rotor frequency modulation excitation produces causes, generator shaft voltage essence is the residual voltage of rotor three-phase winding, high frequency common mode voltage forms loop over the ground through generator amature, rotating shaft and bearing, forms shaft current.Therefore bearing needs the high frequency common mode voltage tolerating frequency converter generation, and its peak value is at more than 1000V.If there is insulation weak link in bearing, namely high frequency common mode voltage can spark, puncture oil film insulation and spark discharge occurs, damage raceway forms washboard vestige, and produce abnormal high temperature and high vibration, cause the shortening of bearing operation life, and raise along with the growth spoilage of the generator operation time limit.In addition, generator shaft electric current also has heating effect to bearing, causes bearing lubrication to lose efficacy, accelerated wear test.So generator shaft electric current is the main cause damaged dynamo bearing galvanic corrosion.
For avoiding the generation of above-mentioned phenomenon, reduce the shaft voltage of rotor at present by connecting grounding carbon brush, thus reduce the breakdown possibility of bearing.
Further, current motor manufacturer, in order to reduce the impact of shaft current on bearing, requires that motor carries out electrical insulation testing to dynamo bearing before dispatching from the factory.As bearing insulation resistance test (1000V, >11G Ω) and bearing DC break down voltage test (2500V, 1min), the breakdown phenomenon of bearing all can not be there is.But these tests are off-line test, the value namely measured under generator stationary state, can not ensure that gen-set insulate under rotation status and also meet the requirements.
As can be seen here, the above-mentioned existing measurement mechanism for measuring generator shaft voltage, in structure, method and use, obviously still has inconvenience and defect, and is urgently further improved.How to found the new on-line measurement device of the generator shaft voltage under a kind of energy on-line measurement running status, one of current important research and development problem of real genus.
Utility model content
The technical problems to be solved in the utility model is to provide the on-line measurement device of generator shaft voltage in a kind of Wind turbines, make the on-line measurement completing generator shaft voltage in Wind turbines that it is safe and simple, thus overcome the deficiency of the existing measurement mechanism for measuring generator shaft voltage.
For solving the problems of the technologies described above, the utility model provides a kind of on-line measurement device measuring generator shaft voltage in Wind turbines, comprise conductor, the test lead be connected with conductor and insulated handle, described conductor is soft copper conductor, described test lead is connected with testing tool, and described testing tool is multimeter or oscillograph.
Improve as one of the present utility model, the profile of described conductor is flat, and width is greater than 15mm, and thickness is less than 5mm, length 1m.
Further improvement, described test lead is the copper conductor with transparent insulation sheath, and the sectional area of its copper conductor is 1.5mm
2, length is 1.5m.
Further improvement, described insulated handle is provided with for handle groove close-connected with described conductor.
Further improvement, described insulated handle adopts insulating rubber material.
Adopt above-mentioned technical scheme, the utility model at least has the following advantages:
1. the utility model by soft copper conductor be incorporated into the power networks under alternator shaft contact; and by the safeguard protection of insulated handle; can be safe, easy realize the shaft voltage level of on-line measurement generator under being incorporated into the power networks; both the electrical safety of effective guarantee tester and machine security, turn improves the accuracy of insulating property test under bearing running status.
2. the utility model is in use by test to the generator shaft voltage before and after grounding carbon brush, can more objective and accurate reflection to be incorporated into the power networks the validity protection performance of insulating property that condition generator shaft holds and grounding carbon brush.
Accompanying drawing explanation
Above-mentioned is only the general introduction of technical solutions of the utility model, and in order to better understand technological means of the present utility model, below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
Fig. 1 is the using state schematic diagram of the utility model generator shaft voltage on-line measurement device.
Embodiment
The size measuring wind power generating set shaft voltage under generator operation (grid-connected) state also exists very large danger, first is that high voltage is dangerous, because the peak-to-peak value of test voltage is doubled in bus DC voltage value, may up to 1kV or more than 1kV, if in test process and human contact, there is the danger of getting an electric shock and dying in tester; Second danger is the rotor of High Rotation Speed, if tester's misoperation, testing apparatus or foreign material throw away and can wound tester, and same testing apparatus is involved in rotor also can cause the injured or device damage of tester.Therefore, how safe and simple the size of what the application mainly solved is on-line measurement wind power generating set shaft voltage under generator operation (grid-connected) state, ensure the safety of tester.
Visible with reference to accompanying drawing 1, the present embodiment on-line measurement device comprises conductor 1, the test lead 2 be connected with conductor 1 and insulated handle 3.
This conductor 1 is soft copper bar or soft copper rod conductor, and its profile is flat, and width is greater than 15mm, and thickness is less than 5mm, and length is about 1m, and its one end compact siro spinning technology insulated handle 3, contacts with the rotating shaft 4 of generator when the other end is for testing.
The test lead 2 be connected with conductor 1 is for having the copper conductor of transparent insulation sheath, and its sectional area is 1.5mm
2, length is 1.5m.
This insulated handle 3 uses insulating rubber material, need meet the test of insulation resistance direct current 2500V, is greater than 1G Ω, and which is provided with handle groove, and this handle groove is used for and conductor 1 compact siro spinning technology.
In use, concrete testing procedure is as follows for the utility model on-line measurement device:
1) test lead 2 of this on-line measurement device is connected to testing tool 5, as multimeter or oscillographic positive pole, and the negative pole of this testing tool 5 is connected to the casing 6 of Wind turbines.
2) after the generator of Wind turbines rotates to grid-connected rotating speed, wear 1000V insulating glove and with the tester of standard insulated working footwear, the soft copper bar of this on-line measurement device or soft copper rod conductor 1 are contacted with alternator shaft 4.
3) reading of observation test instrument 5, as waveform or multimeter registration, can measure and obtain generator in the size of lower shaft voltage that is incorporated into the power networks.
In order to the validity that the insulativity and grounding carbon brush that better judge dynamo bearing in Wind turbines are protected, the utility model on-line measurement device first can measure shaft voltage level when not installing generator operation in generator grounding carbon brush situation, to judge that whether bearing insulation performance is normal; In the normal situation of bearing insulation performance, then measure shaft voltage level when installing generator grounding carbon brush generator operation, to judge that whether carbon brush bypass protection is normal, finally judge whether bearing is grounded carbon brush and effectively protects.Its judgment criteria is:
(1) the shaft voltage test in generator grounding carbon brush situation is not installed
If the peak-to-peak value that this on-line measurement device is measured be 1 times to DC bus-bar voltage (representative value 1070V), when effective value is about 300V, judge that bearing insulation performance is normal;
If the peak-to-peak value that this on-line measurement device is measured is 5% (representative value 30V) of not enough d-c bus voltage value, when effective value is about 7V, judge that bearing insulation performance is abnormal.
(2) shaft voltage test when bearing insulation installs generator grounding carbon brush under normal circumstances
If the peak-to-peak value that this on-line measurement device is measured is 5% (representative value 30V) of not enough d-c bus voltage value, when effective value is about 7V, judge that carbon brush bypass protection is normal;
If the peak-to-peak value that this on-line measurement device is measured be 1 times to DC bus-bar voltage (representative value 1070V), when effective value is about 300V, judge that carbon brush bypass protection is abnormal.
According to above-mentioned judgment criteria, shaft voltage in one actual Wind turbines is measured, first the shaft voltage of generator when not installing grounding carbon brush is measured: start Wind turbines and complete and network process, note the safety of personnel in start-up course, during measurement, tester needs hand-held insulated handle 3, the test lead 2 of this on-line measurement device is connected with oscillograph or multimeter, and oscillograph is selected to measure under pwm signal, when the soft copper bar of this on-line measurement device or soft copper rod conductor 1 contact gently with alternator shaft 4, shaft voltage effective value when oscillograph records rotor suspension is 342V, the shaft voltage effective value that multimeter exchanges when shelves record rotor suspension is 306V, judge that the bearing insulation performance of this Wind turbines is normal,
On this basis, measure the shaft voltage of generator when installing grounding carbon brush: same startup Wind turbines also completes and network process, during measurement, tester needs hand-held insulated handle 3, the test lead 2 of this on-line measurement device is connected with oscillograph or multimeter, and oscillograph is selected to measure under pwm signal, when the soft copper bar of this on-line measurement device or soft copper rod conductor 1 contact gently with alternator shaft 4, shaft voltage effective value when oscillograph records rotor suspension is 7.6V, the shaft voltage effective value that multimeter exchanges when shelves record rotor suspension is 7.69V, judge that the grounding carbon brush bypass protection of this Wind turbines is normal.
The utility model effectively can test the shaft voltage level of generator under being incorporated into the power networks, the insulating property of more objective and accurate reflection dynamo bearing and the validity protection performance of grounding carbon brush, the accuracy tested under improve bearing running status.
In addition, the utility model by effective insulating Design and the design of light conductor contact, the electrical safety of effective guarantee tester and machine security.
The above; it is only preferred embodiment of the present utility model; not do any pro forma restriction to the utility model, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection domain of the present utility model.
Claims (5)
1. measure the on-line measurement device of generator shaft voltage in Wind turbines for one kind, it is characterized in that, comprise conductor, the test lead be connected with conductor and insulated handle, described conductor is soft copper conductor, described test lead is connected with testing tool, and described testing tool is multimeter or oscillograph.
2. the on-line measurement device of generator shaft voltage in measurement Wind turbines according to claim 1, it is characterized in that, the profile of described conductor is flat, and width is greater than 15mm, and thickness is less than 5mm, length 1m.
3. the on-line measurement device of generator shaft voltage in measurement Wind turbines according to claim 1, it is characterized in that, described test lead is the copper conductor with transparent insulation sheath, and the sectional area of its copper conductor is 1.5mm
2, length is 1.5m.
4. the on-line measurement device of generator shaft voltage in measurement Wind turbines according to claim 1, it is characterized in that, described insulated handle is provided with for handle groove close-connected with described conductor.
5. the on-line measurement device of generator shaft voltage in measurement Wind turbines according to claim 4, is characterized in that, described insulated handle adopts insulating rubber material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520563943.5U CN204925215U (en) | 2015-07-30 | 2015-07-30 | On line measurement device of generator shaft voltage among measurement wind turbine generator system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520563943.5U CN204925215U (en) | 2015-07-30 | 2015-07-30 | On line measurement device of generator shaft voltage among measurement wind turbine generator system |
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| CN204925215U true CN204925215U (en) | 2015-12-30 |
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| CN201520563943.5U Expired - Fee Related CN204925215U (en) | 2015-07-30 | 2015-07-30 | On line measurement device of generator shaft voltage among measurement wind turbine generator system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707119A (en) * | 2016-12-23 | 2017-05-24 | 中国二冶集团有限公司 | Insulation detection method for large- scale motor bearing |
| 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 |
| CN110632513A (en) * | 2019-08-19 | 2019-12-31 | 华电电力科学研究院有限公司 | Generator stator slot anti-corona layer potential measuring device and measuring method |
| CN111289896A (en) * | 2020-02-11 | 2020-06-16 | 威睿电动汽车技术(宁波)有限公司 | Electrical property measuring device based on motor |
| CN112649650A (en) * | 2020-11-18 | 2021-04-13 | 华北电力大学（保定） | Device for measuring generator shaft voltage, measuring method and application |
| CN113567730A (en) * | 2021-08-09 | 2021-10-29 | 华能新能源股份有限公司陕西分公司 | Generator shaft voltage measuring method based on rotating speed signal |
-
2015
- 2015-07-30 CN CN201520563943.5U patent/CN204925215U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707119A (en) * | 2016-12-23 | 2017-05-24 | 中国二冶集团有限公司 | Insulation detection method for large- scale motor bearing |
| CN110632513A (en) * | 2019-08-19 | 2019-12-31 | 华电电力科学研究院有限公司 | Generator stator slot anti-corona layer potential measuring device and measuring method |
| 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 |
| CN111289896A (en) * | 2020-02-11 | 2020-06-16 | 威睿电动汽车技术(宁波)有限公司 | Electrical property measuring device based on motor |
| CN112649650A (en) * | 2020-11-18 | 2021-04-13 | 华北电力大学（保定） | Device for measuring generator shaft voltage, measuring method and application |
| CN112649650B (en) * | 2020-11-18 | 2023-04-21 | 华北电力大学（保定） | Device for measuring generator shaft voltage, measuring method and application |
| CN113567730A (en) * | 2021-08-09 | 2021-10-29 | 华能新能源股份有限公司陕西分公司 | Generator shaft voltage measuring method based on rotating speed signal |
| CN113567730B (en) * | 2021-08-09 | 2024-05-24 | 华能新能源股份有限公司陕西分公司 | Generator shaft voltage measurement method based on rotating speed signal |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151230 Termination date: 20180730 |
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| CF01 | Termination of patent right due to non-payment of annual fee |