CN210572635U - Dynamic turn-to-turn short circuit detection device for rotor winding of hydraulic generator - Google Patents
Dynamic turn-to-turn short circuit detection device for rotor winding of hydraulic generator Download PDFInfo
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- CN210572635U CN210572635U CN201921362504.2U CN201921362504U CN210572635U CN 210572635 U CN210572635 U CN 210572635U CN 201921362504 U CN201921362504 U CN 201921362504U CN 210572635 U CN210572635 U CN 210572635U
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Abstract
A dynamic turn-to-turn short circuit detection device for a rotor winding of a hydraulic generator. The traditional detection method is to measure the alternating current impedance value of the rotor magnetic pole when the rotor is static so as to judge the number of the fault magnetic pole, but the method cannot detect the data abnormity for the turn-to-turn short circuit fault of the rotor magnetic pole. The utility model discloses the constitution includes: iron core support (5), baffle (6), macroaxis (9), key looks piece (10) and key looks sensor (11), be fixed with a set of screw rod (1) on the iron core support, be fixed with stator core (4) on the screw rod, follow supreme by down on the stator core the baffle divide into 3 intervals, the winding has round detection winding (3) on every interval stator core's silicon steel sheet ventilation hole, establishes ties between the adjacent two rings detection winding, and every ring detection winding walks around multilayer stator core's silicon steel sheet (2). The utility model is used for the detection of hydraulic generator rotor winding developments turn-to-turn short circuit fault.
Description
The technical field is as follows:
the utility model relates to a hydraulic generator rotor winding developments turn-to-turn short circuit detection device.
Background art:
when a hydro-generator rotor magnetic pole has a turn-to-turn short circuit fault, the traditional detection method is to measure the alternating-current impedance value of the rotor magnetic pole when the rotor is static (namely in a static state) so as to judge the number of the fault magnetic pole.
The utility model has the following contents:
the utility model aims at solving present detection method and only being applicable to the static turn-to-turn short circuit condition of hydraulic generator rotor magnetic pole, to the dynamic turn-to-turn short circuit of rotor magnetic pole, then can't detect out the unusual problem of data, provide a hydraulic generator rotor winding developments turn-to-turn short circuit detection device that can the accurate determination trouble magnetic pole number.
The above purpose is realized by the following technical scheme:
a hydraulic generator rotor winding developments turn-to-turn short circuit detection device, its constitution includes: iron core support, baffle, macroaxis, key looks piece and key looks sensor, the iron core support on be fixed with a set of screw rod, the screw rod on be fixed with stator core, stator core on follow supreme by down the baffle divide into 3 intervals, every interval stator core's silicon steel sheet ventilation hole on the winding have the round to survey the winding, adjacent two rings survey the winding between establish ties, every circle survey the winding walk around the multilayer stator core's silicon steel sheet.
According to the dynamic turn-to-turn short circuit detection device for the rotor winding of the hydraulic generator, each circle of the detection winding bypasses 4-5 layers of silicon steel sheets of the stator core.
Has the advantages that:
1. the utility model discloses follow supreme 3 intervals that divide into by the baffle down on the stator core, the winding has round detection winding, adjacent two circles on every interval silicon steel sheet ventilation hole detection winding between establish ties, every circle detection winding bypass 4-5 layers the stator core's silicon steel sheet, can increase induced potential's amplitude, also can guarantee the accuracy of testing result simultaneously.
The utility model discloses a dynamic detection coil wave form method, creatively install on hydroelectric set stator core and survey the winding, when the rotor is rotatory with rated speed, apply appropriate exciting current on rotor winding, every magnetic pole all can produce induced electromotive force on this detection winding, this induced electromotive force's amplitude is directly proportional with the effective number of turns of the magnetic pole that corresponds, through analysis induced electromotive force waveform amplitude size and distortion condition, according to key looks signal positioning, thereby the accurate fault magnetic pole number of judging.
The utility model discloses a detection method can improve the rapidity and the accuracy of troubleshooting, can lock the trouble magnetic pole in the shortest time to formulate the quick processing trouble of maintenance scheme, furthest reduces the electric quantity loss.
The utility model discloses key looks piece should just to certain magnetic pole of rotor, can conveniently carry out trouble magnetic pole location when the waveform analysis.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic diagram of a dynamic detection coil wave method;
FIG. 3 is a waveform diagram of a detection coil waveform method;
in the figure: 1. a screw; 2. silicon steel sheets; 3. detecting a winding; 4. a stator core; 5. an iron core support; 6. a partition plate; 7. connecting a lead; 8. a rotor; 9. a large shaft; 10. a key phase block; 11. a key phase sensor.
The specific implementation mode is as follows:
example 1:
a hydraulic generator rotor winding developments turn-to-turn short circuit detection device, its constitution includes: iron core support 5, baffle 6, macroaxis 9, key looks piece 10 and key looks sensor 11, the iron core support on be fixed with a set of screw rod 1, the screw rod on be fixed with stator core 4, stator core on follow supreme by down the baffle divide into 3 intervals, every interval stator core's silicon steel sheet ventilation hole on the winding have the round to survey winding 3, adjacent two rings survey winding between establish ties, every ring survey winding walk around the multilayer stator core's silicon steel sheet 2.
Example 2:
according to the dynamic turn-to-turn short circuit detection device for the rotor winding of the hydraulic generator in the embodiment 1, each circle of the detection winding bypasses 4-5 layers of silicon steel sheets of the stator core.
Example 3:
a detection method of a hydro-generator rotor winding dynamic turn-to-turn short circuit detection device comprises the following steps:
1) installing detection coils in the stator core vent holes, wherein the detection coils use single-core insulating flexible wires, the detection coils are respectively installed in 3 intervals and connected in series with a wiring, and the number of layers of the enclosed stator core silicon steel sheets is 4; the more the number of the iron core layers surrounded by the detection coil is, the larger the amplitude of the induction potential is; the detection coil should form a closed winding; the distance between the detection coil and the surface of the rotor is kept;
(2) a key phase sensor is arranged on the end cover of the water guide oil basin in the locomotive unit water wagon room, a key phase block is adhered to the corresponding position of the locomotive unit main shaft, and the installation direction of the key phase block is opposite to the center of the magnetic pole of the rotor;
(3) signals of the detection coil and the key phase sensor are connected to an electric quantity waveform recording analyzer, after the unit is started to idle, the exciting current of the rotor winding is gradually increased from 0, the applied exciting current is not larger than the rated no-load exciting current of the rotor winding, the voltage is increased in batches by taking 10% rated voltage as gradient, each voltage gradient stays for 5-10 minutes, and after waveform data are stabilized, recording is carried out. The method comprises the steps of carrying out waveform recording analysis on induced potential of a detection winding during each gradient through an electric quantity waveform recording analyzer, judging whether a certain peak amplitude is obviously smaller than amplitudes of other peaks or not according to comparison of amplitudes of characteristic peaks of waveforms, and if the peak with the obviously smaller amplitude exists, indicating that a magnetic pole generating the peak has an inter-turn short circuit phenomenon, so that electromagnetic force at the position is reduced. After the wave crest with the smaller amplitude is determined, the key phase signal can be used for positioning, so that the turn-to-turn short circuit fault of a magnetic pole of the rotor can be accurately judged.
The waveform chart of the test result of the dynamic detection coil waveform method is shown in fig. 3, and analysis of the waveform shows that 1 peak has an amplitude which is obviously smaller than that of the other 9 peaks in each period (10 magnetic poles alternately generate 10 peaks), and the amplitude difference is about 14%. And (3) confirming that the No. 6 magnetic pole causing small amplitude of the induced potential is the magnetic pole by utilizing key phase signal positioning in combination with the position relation of the detection coil, the key phase block and the key phase sensor.
After confirming the No. 6 magnetic pole fault, immediately making an emergency repair scheme, completing a system emergency repair work such as No. 6 magnetic pole dismantling and new magnetic pole hanging in a machine pit on the premise of not hanging out a rotor, then starting the machine to a rated rotating speed to perform a zero-lifting pressure test, pressurizing to 100% rated voltage, and ensuring that the vibration swing value of the machine set meets the standard requirement.
When the excitation current or vibration amplitude of the generator is obviously increased and the reason is unknown, the turn-to-turn short circuit fault of the rotor winding is diagnosed. The static turn-to-turn short circuit of the rotor winding is easy to detect, the symmetry of the rotor magnetic poles can be utilized to determine which magnetic pole has the turn-to-turn short circuit through a static alternating current impedance test, the dynamic turn-to-turn short circuit of the rotor magnetic poles is unstable and changes along with the rotating speed of the rotor, when the machine is stopped to carry out a static electrical test, all test results are normal, great difficulty is brought to fault finding, and even the fault finding work is in a dead state. By adopting a dynamic alternating-current impedance test method and a dynamic detection coil waveform method, the rapidness and the accuracy of fault finding can be improved, and a fault magnetic pole can be locked in the shortest time, so that a maintenance scheme is formulated to rapidly process faults, and the electric quantity loss is reduced to the maximum extent.
Claims (2)
1. A hydraulic generator rotor winding developments turn-to-turn short circuit detection device, its constitution includes: iron core support, baffle, macroaxis, key looks piece and key looks sensor, characterized by: the iron core support on be fixed with a set of screw rod, the screw rod on be fixed with stator core, stator core on follow supreme by the baffle divide into 3 intervals, every interval stator core's silicon steel sheet ventilation hole on the winding have the round to survey the winding, adjacent two circles survey the winding between establish ties, every circle survey the winding walk around the multilayer stator core's silicon steel sheet.
2. The hydro-generator rotor winding dynamic turn-to-turn short circuit detection device of claim 1, characterized in that: and each circle of detection winding bypasses 4-5 layers of silicon steel sheets of the stator core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921362504.2U CN210572635U (en) | 2019-08-21 | 2019-08-21 | Dynamic turn-to-turn short circuit detection device for rotor winding of hydraulic generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921362504.2U CN210572635U (en) | 2019-08-21 | 2019-08-21 | Dynamic turn-to-turn short circuit detection device for rotor winding of hydraulic generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210572635U true CN210572635U (en) | 2020-05-19 |
Family
ID=70638327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921362504.2U Expired - Fee Related CN210572635U (en) | 2019-08-21 | 2019-08-21 | Dynamic turn-to-turn short circuit detection device for rotor winding of hydraulic generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210572635U (en) |
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2019
- 2019-08-21 CN CN201921362504.2U patent/CN210572635U/en not_active Expired - Fee Related
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200519 Termination date: 20210821 |