CN214895750U - On-line monitoring device for rotor magnetic flux of hydroelectric generating set - Google Patents
On-line monitoring device for rotor magnetic flux of hydroelectric generating set Download PDFInfo
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- CN214895750U CN214895750U CN202120023887.1U CN202120023887U CN214895750U CN 214895750 U CN214895750 U CN 214895750U CN 202120023887 U CN202120023887 U CN 202120023887U CN 214895750 U CN214895750 U CN 214895750U
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Abstract
The utility model provides an on-line monitoring device of hydroelectric set rotor magnetic flux, include: the device comprises a detection module, a magnetic flux monitor and a display module; the detection module is electrically connected with the magnetic flux monitor, and the magnetic flux monitor is electrically connected with the display module; the detection module comprises a full magnetic flux probe and a key phase sensor, the full magnetic flux probe is arranged on a stator iron core of the hydraulic generator, and the key phase sensor is positioned on a water guide oil groove cover of the hydraulic generator and is close to the position of the large shaft. The utility model adopts the full magnetic flux probe, and simultaneously, the key phase sensor is matched to carry out signal synchronization and phase positioning, thereby realizing the online measurement of the rotor magnetic flux during the normal operation of the unit; the full magnetic flux probe has small volume, can be applied to a generator set with compact dynamic and static clearance structures, can be directly adhered to a stator of a hydraulic generator, cannot damage the generator set structure during installation, and reduces the operation risk; the measuring signal is connected into the magnetic flux monitor, so that data can be read on site, and the measuring result can be visually checked.
Description
Technical Field
The utility model relates to a hydroelectric power generation trade especially relates to an on-line monitoring device of hydroelectric set rotor magnetic flux.
Background
The traditional detection method for detecting whether the magnetic flux of the generator set rotor is in turn-to-turn short circuit is as follows:
referring to fig. 1, under different loads of the generator, by means of a flux probe installed on a stator core, in an operating state of the generator, a leakage flux signal induced by each magnetic pole passing through the flux probe is measured, the magnitude of leakage flux caused by inter-turn short circuit is detected at a zero-crossing point position of total flux density, the measurement signal is input to an oscilloscope through a junction box, and then a waveform of the oscilloscope is displayed on a display. According to the method, the leakage magnetic flux of each slot of different magnetic poles needs to be manually measured and compared under different load conditions, so that whether the inter-turn short circuit phenomenon exists in the slot or not can be determined, and the slot where the short-circuit turn exists can be positioned.
The existing detection method has the following problems:
1) the operation difficulty is large: in order to eliminate the interference of the main magnetic flux, the test is required to be carried out in the shutdown state of the hydraulic generator. The number of poles of the rotor of the large-scale hydraulic generator is very large, the load of the generator set needs to be adjusted in a large range during operation test, and when a main flux curve passes through a zero point, manual test is carried out on one pole and the other pole;
2) inaccurate test: because the rotor is stationary after shutdown, without the effect of centrifugal force, some short circuit faults that may only be apparent under normal rotation conditions may not be detected. On the contrary, the short-circuit fault displayed under the shutdown condition may not exist in the operation;
3) the test result is not intuitive: the measurement result needs expert assistance to interpret, and the popularization of the technology is limited;
4) the applicability is not strong: the traditional magnetic flux probe is of a cylindrical structure, is large in size, can be installed only by destructively punching on a stator core, and has certain destructiveness in installation; in addition, the volume is large, and the device is not suitable for a novel water turbine generator set with compact structure of dynamic and static gaps.
Disclosure of Invention
In view of the above prior art's shortcoming, the utility model aims to provide an on-line monitoring device of hydroelectric set rotor magnetic flow for solve among the prior art test operation degree of difficulty big, the test result is inaccurate, the test result is not directly perceived, the not strong problem of suitability.
In order to realize above-mentioned purpose and other relevant purpose, the utility model provides an on-line monitoring device of hydroelectric set rotor magnetic flux, include: the device comprises a detection module, a magnetic flux monitor and a display module;
the detection module is electrically connected with the magnetic flux monitor, and the magnetic flux monitor is electrically connected with the display module;
the detection module comprises a full magnetic flux probe and a key phase sensor, the full magnetic flux probe is arranged on a stator iron core of the hydraulic generator, and the key phase sensor is arranged on a water guide oil groove cover of the hydraulic generator.
In an embodiment of the present invention, the full magnetic flux probe is adhered to the stator core of the hydraulic generator.
In an embodiment of the present invention, the full magnetic flux probe is attached to the stator core of the hydraulic generator by resin adhesive.
In an embodiment of the present invention, the number of the full magnetic flux probes is 2.
In an embodiment of the present invention, the key phase sensor is fixed on the water guide oil groove cover of the hydraulic generator by bolts.
In an embodiment of the utility model, the water guide oil groove is covered and is equipped with the support, the bottom of support with water guide oil groove lid fixed connection, key looks sensor adopts the bolt fastening to be in on the support.
In an embodiment of the present invention, the number of the key phase sensors is 1.
In an embodiment of the utility model, the on-line monitoring device of hydroelectric set rotor magnetic flux still includes the junction box, detection module's output with the input electricity of junction box is connected, the output of junction box with the input electricity of magnetic flux monitor is connected.
In an embodiment of the present invention, the display module includes an ipad, a PC terminal, an Android mobile terminal or a large-size touch screen.
As above, the utility model discloses an on-line monitoring device of hydroelectric set rotor magnetic flux has following beneficial effect:
1. the main magnetic flux and the leakage magnetic flux of the rotor magnetic flux are measured by adopting the full-magnetic-flux probe, and the magnetic poles passing through the full-magnetic-flux probe are positioned by adopting the key phase sensor as a datum point, so that the online measurement of the rotor magnetic flux during the normal operation of the unit is realized;
2. compared with the traditional magnetic flux probe, the full magnetic flux probe has smaller volume, can be applied to a generator set with compact dynamic and static clearance structures, can be directly adhered to a stator of a hydraulic generator, cannot damage the structure of the generator set during installation, and reduces the operation risk;
3. the measurement signals of the full magnetic flux probe and the key phase sensor are connected into the magnetic flux monitor, so that data can be read on site, and the measurement result can be visually checked.
Drawings
Fig. 1 shows a schematic view of the overall structure disclosed in the prior art of the present invention.
Fig. 2 is a schematic diagram of the wiring disclosed in the embodiment of the present invention.
Fig. 3 is a schematic view of the overall structure disclosed in the embodiment of the present invention.
Fig. 4 is a schematic view showing the installation of the key phase sensor disclosed in the embodiment of the present invention.
1-a detection module; 2-a magnetic flux monitor; 3-a display module; 4-water oil guide groove cover; 5-a bracket; 6-a junction box;
101-full flux probe; 102-key phase sensor.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
Referring to fig. 2, the present invention provides an on-line monitoring device for rotor flux of a hydroelectric generating set, including: the device comprises a detection module 1, a magnetic flux monitor 2 and a display module 3; the detection module 1 is electrically connected with the magnetic flux monitor 2, and the magnetic flux monitor 2 is electrically connected with the display module 3; the detection module 1 includes a full magnetic flux probe 101 and a key phase sensor 102.
Referring to fig. 3, the full magnetic flux probe 101 is installed on a stator core of the hydro-generator, and can detect the magnetic flux in the air gap of the generator and give information about the turn-to-turn insulation condition of the rotor in real time during the normal operation of the motor, thereby determining whether a winding short circuit has occurred in the magnetic pole of the rotor. The leakage flux in a single slot is related to the number of effective turns in that slot, and the occurrence of a turn-to-turn short will result in a reduced leakage flux for that particular slot. When each magnetic pole sweeps across the magnetic flux probe, the voltage induced in the coil is in direct proportion to the magnetic flux of the magnetic pole sweeping across the coil, the voltage of the coil can be measured through the magnetic flux monitor 2, the effective ampere turns of the pole are reduced when the turn-to-turn short circuit exists in one magnetic pole, and the leakage magnetic flux data corresponding to the slot numbers of two different poles are compared, so that the slot where the winding with the turn-to-turn short circuit is located can be found visually.
The type IRIS power fprode used for the full flux probe 101 in this embodiment.
The full magnetic flux probe 101 is a T-shaped sensor, has the size of only one coin, can be directly adhered to one tooth of the stator core, is convenient to install and does not damage the stator core. In this embodiment, resin paste is used.
The full-magnetic-flux probe 101 uses a printed coil, adopts the latest printed circuit design, has higher sensitivity and resolution, can simultaneously measure main magnetic flux and leakage magnetic flux without the interference of the main magnetic flux to the leakage magnetic flux, and realizes the online measurement of the rotor magnetic flux during the normal operation of the unit by matching with the key phase sensor 102 to position the measured magnetic pole.
In the present embodiment, the mounting position or angle of the full-flux probe 101 to the stator is not limited, and the full-flux probe can be mounted as needed when used. In addition, the number of the full-magnetic-flux probes 101 may be multiple, the number selected in this embodiment is 2, and in a specific application, a user may also set a specific number as needed, which is not described herein again.
Continuing on, the key phase sensor 102 is fixed to the water guide sump cover 4 of the hydro-generator.
Referring to fig. 4, the key phase sensor 102 is fixed on the water guide oil tank cover 4 by bolts, in this embodiment, the water guide oil tank cover 4 is further provided with a bracket 5, and the key phase sensor 102 is disposed on the bracket 5.
The key phase sensor 102 is used as a reference point to position the signal, phase and pole of the full magnetic flux probe 101, so that a digitized voltage signal can be obtained, positioning information is transmitted to the magnetic flux monitor 2, the magnetic flux monitor 2 can compare the magnetic flux measured by the full magnetic flux probe of the corresponding pole or the adjacent pole, the comparison result is transmitted to the display module 3, the comparison result is represented in a data list or a graph mode, and the magnetic poles with the difference exceeding the set ratio are regarded as fault parts with less magnetic flux and can be automatically marked. In this case, the phase difference ratio is generally 3%.
In this embodiment, the number of the key phase sensors 102 is 1, and in a specific application, a user may set a specific number as needed, which is not described herein again.
The on-line monitoring device for the rotor magnetic flux of the water-turbine generator set of the utility model also comprises a junction box 6,
referring to fig. 2, the output end of the detection module 1 is input into the magnetic flux monitor 2 through the junction box 6.
In summary, the utility model relates to an on-line monitoring device for rotor flux of a hydroelectric generating set,
1. the testing can be carried out during the normal operation of the unit, the load does not need to be adjusted, the operation difficulty is small, and the on-line monitoring application of the turn-to-turn short circuit of the rotor is realized;
2. compared with the traditional magnetic flux probe, the full magnetic flux probe has smaller volume, can be applied to a novel water turbine generator set with compact structure, can be directly adhered to a stator of a generator, cannot damage the structure of the generator set during installation, and reduces the operation risk;
3. the existing key phase sensor technology is introduced, so that the fault pole can be accurately positioned;
4. the measuring signal is connected into the magnetic flux monitor, data can be read on site, the measuring result can be visually checked through the display module, the rotor simulation diagram can be visually output, fault points are marked, and the magnetic flux monitor is beneficial to improving the maintenance efficiency.
Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The utility model provides an on-line monitoring device of hydroelectric set rotor magnetic flux which characterized in that includes: the device comprises a detection module, a magnetic flux monitor and a display module;
the detection module is electrically connected with the magnetic flux monitor, and the magnetic flux monitor is electrically connected with the display module;
the detection module comprises a full magnetic flux probe and a key phase sensor, the full magnetic flux probe is arranged on a stator iron core of the hydraulic generator, and the key phase sensor is arranged on a water guide oil groove cover of the hydraulic generator.
2. The on-line monitoring device of the rotor magnetic flux of the hydroelectric generating set according to claim 1, characterized in that: the full magnetic flux probe is adhered to a stator iron core of the hydraulic generator.
3. The on-line monitoring device of the rotor magnetic flux of the hydroelectric generating set according to claim 2, characterized in that: the full magnetic flux probe is adhered to a stator iron core of the hydraulic generator by resin adhesive.
4. The on-line monitoring device of the rotor magnetic flux of the hydroelectric generating set according to claim 3, characterized in that: the number of the full magnetic flux probes is 2.
5. The on-line monitoring device of the rotor magnetic flux of the hydroelectric generating set according to claim 1, characterized in that: the key phase sensor is fixed on a water guide oil groove cover of the hydraulic generator by bolts.
6. The on-line monitoring device of the rotor magnetic flux of the hydroelectric generating set according to claim 5, characterized in that: the water guide oil groove cover is provided with a support, the bottom of the support is fixedly connected with the water guide oil groove cover, and the key phase sensor is fixed on the support through bolts.
7. The on-line monitoring device of the rotor magnetic flux of the hydroelectric generating set according to claim 6, characterized in that: the number of the key phase sensors is 1.
8. The on-line monitoring device for rotor magnetic flux of a hydroelectric generating set according to claim 1, further comprising: a junction box; the output end of the detection module is electrically connected with the input end of the junction box, and the output end of the junction box is electrically connected with the input end of the magnetic flux monitor.
9. The on-line monitoring device of the rotor magnetic flux of the hydroelectric generating set according to claim 1, characterized in that: the display module comprises an ipad, a computer PC terminal, an Android mobile terminal or a large-size touch screen.
10. The on-line monitoring device of the rotor magnetic flux of the hydroelectric generating set according to claim 1, characterized in that: the full magnetic flux probe is a T-shaped sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120023887.1U CN214895750U (en) | 2021-01-06 | 2021-01-06 | On-line monitoring device for rotor magnetic flux of hydroelectric generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120023887.1U CN214895750U (en) | 2021-01-06 | 2021-01-06 | On-line monitoring device for rotor magnetic flux of hydroelectric generating set |
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| CN214895750U true CN214895750U (en) | 2021-11-26 |
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| CN202120023887.1U Active CN214895750U (en) | 2021-01-06 | 2021-01-06 | On-line monitoring device for rotor magnetic flux of hydroelectric generating set |
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| CN (1) | CN214895750U (en) |
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2021
- 2021-01-06 CN CN202120023887.1U patent/CN214895750U/en active Active
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