Water-turbine generator set rotor magnetic pole quasi-distributed fiber bragg grating temperature monitoring system

Abstract

A quasi-distributed fiber bragg grating temperature monitoring system for a rotor magnetic pole of a water-turbine generator set comprises a measuring device and a demodulator. The measuring device comprises a magnetic cover and an optical fiber, the magnetic cover comprises a streamline cover plate and an optical fiber mounting plate, the optical fiber is inserted into the optical fiber mounting plate, a plurality of grating measuring points are arranged on the optical fiber, and the optical fiber is sequentially connected with a fixing device, a dynamic and static conversion device, a demodulator and a wireless communication device. The temperature is sequentially transmitted to the optical fiber mounting plate and the grating measuring point by the rotor magnetic pole, then the central wavelength offset of a reflected light signal is generated on the grating measuring point, and the temperature of the rotor magnetic pole is calculated by the demodulator, the wireless communication device and the computer. The temperature of the rotor magnetic pole is measured by using the optical fiber, and the optical fiber is not interfered by electromagnetic interference, so that the temperature measurement effect is good; the magnetic cover can accurately transmit the temperature of the rotor magnetic pole to the optical fiber, so that the optical fiber is high in temperature measurement precision. Therefore, according to the design, the temperature measurement effect is good, and the measurement precision is high.

Description

Technical Field

[0001] The invention relates to a hydro-generator rotor magnetic pole monitoring system, belongs to the field of hydro-generator rotor magnetic pole monitoring, and in particular to a hydro-generator rotor magnetic pole quasi-distributed fiber grating temperature monitoring system. Background Art

[0002] At present, hydroelectric generator sets are the main power equipment for generating electricity in hydropower stations. The rotor magnetic poles in the hydroelectric generator sets are susceptible to multiple factors such as vibration, electromagnetic energy loss and installation accuracy during their continuous operation, which in turn causes the problem of abnormal increase in magnetic pole temperature. If this abnormal temperature increase is not detected and properly handled in time, it is very likely to trigger a series of serious consequences such as short circuit accidents, fire risks, emergency shutdown of equipment and even threats to personnel safety, ultimately causing immeasurable direct economic losses and indirect social impacts.

[0003] A Chinese patent with application number 202310032716.9 and application date January 10, 2023 discloses a turbine temperature measuring device, including a sensor, a radio frequency antenna, and a temperature data collector. The sensor is directly fixed and installed by bolts on the turbine rotor. The sensor and the collection device communicate through ultra-high frequency passive radio frequency, which can eliminate the interference of the turbine rotor's own magnetic field on signal transmission. The radio frequency antenna is a fan-shaped ring structure, which can be closely arranged along the sensor movement path. Multiple rear parallel or series connections can be formed to form a longer continuous fan ring, so that the sensor and the radio frequency antenna have more communication time and increase the stability of signal transmission. The sensor has its own RFID for marking the temperature measurement point information to prevent cross-reading. Although the design uses a temperature data collector to achieve temperature measurement of the turbine rotor magnetic pole, it still has the following defects: The temperature data collector is an electronic sensor, and there is an electromagnetic field distributed around the rotor poles. The temperature data collector is susceptible to electromagnetic interference, resulting in poor temperature measurement results.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects and problems of poor temperature measurement effect in the prior art and to provide a hydro-generator rotor magnetic pole quasi-distributed fiber Bragg grating temperature monitoring system with better temperature measurement effect.

[0006] To achieve the above objectives, the technical solution of the present invention is: A quasi-distributed fiber grating temperature monitoring system for rotor magnetic poles of a hydro-generator set, the system comprising a measuring device and a demodulator; The measuring device comprises a magnetic cover and an optical fiber, one side of the magnetic cover is a streamlined cover plate, the streamlined cover plate comprises a ramp portion and a protrusion portion, one end of the ramp portion along the rotation direction of the rotor magnetic pole is connected to one end of the protrusion portion; the other side of the magnetic cover is an optical fiber mounting plate, the optical fiber mounting plate is fitted and connected to one side of the rotor magnetic pole, the side of the optical fiber mounting plate close to the rotor magnetic pole is provided with an optical fiber groove, an optical fiber is inserted in the optical fiber groove, a plurality of grating measuring points are provided on the optical fiber, one end of the optical fiber located outside the optical fiber groove is connected to one end of the fixing device, and the other end of the fixing device is connected to one end of the dynamic-static conversion device; The other end of the dynamic-static conversion device is connected to one end of the demodulator, and the other end of the demodulator is connected to the wireless communication device.

[0007] The magnetic cover includes two wing plates, one end of one wing plate is connected to one end of the optical fiber mounting plate, and the other wing plate is connected to the other end of the optical fiber mounting plate; a plurality of bolt holes are evenly distributed on the wing plates, the middle part of the screw is inserted into the bolt hole, and the bottom of the screw is inserted into the rotor pole.

[0008] The optical fiber includes a first optical fiber and a second optical fiber, and the first optical fiber and the second optical fiber are symmetrically distributed along the center of the rotor magnetic pole.

[0009] The first optical fiber has the same structure as the second optical fiber, and the exterior of the first optical fiber is wrapped with polyetheretherketone, silicone rubber and fluorine material in sequence.

[0010] Eight to ten grating measuring points are evenly distributed on the first optical fiber.

[0011] Ten grating measuring points are evenly distributed on the first optical fiber.

[0012] The fixing device includes a fiber optic adapter box, a pipeline clamp and a wiring block; one end of the optical fiber located outside the optical fiber groove is connected to one end of the fiber optic adapter box, and the other end of the fiber optic adapter box is connected to one end of the transmission optical fiber. The transmission optical fiber passes through the pipeline clamp and the wiring block in sequence and is connected to one end of the dynamic-static conversion device; the outside of the transmission optical fiber is covered with a carbon steel pipe.

[0013] The pipe clamp includes a wire insertion hole, a base and a cover plate, the base is connected to one end of the upper surface of the rotor pole, the middle part of the base and the cover plate is the wire insertion hole, a transmission optical fiber is inserted in the wire insertion hole, a fixing hole is provided on the end of the cover plate away from the base, the middle part of the fixing screw is inserted in the fixing hole, and the bottom of the fixing screw is inserted into the base.

[0014] A top shaft is inserted in the middle of the rotor pole, a wiring block is arranged on one end of the top shaft close to the rotor pole, a wiring groove is arranged in the middle of the wiring block, and the middle part of the transmission optical fiber is inserted in the wiring groove.

[0015] The middle part of the transmission optical fiber is also connected to an optical splitter, and the optical splitter is located on an extension line of a side of the optical fiber switching box away from the optical fiber.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In a quasi-distributed fiber Bragg grating temperature monitoring system for rotor magnetic poles of a hydro-turbine generator set of the present invention, the system comprises a measuring device and a demodulator, the measuring device comprises a magnetic cover and an optical fiber, the magnetic cover comprises a streamlined cover plate and an optical fiber mounting plate, the streamlined cover plate comprises a slope portion and a protrusion, the optical fiber mounting plate is tightly fitted with the outer surface of the rotor magnetic pole, an optical fiber groove is arranged in the optical fiber mounting plate, an optical fiber is inserted in the optical fiber groove, a grating measuring point is arranged on the optical fiber, one end of the optical fiber is connected to one end of a fixing device, and the other end of the fixing device is sequentially connected to a dynamic-static conversion device, a demodulator, and a wireless communication device. When used, the temperature of the rotor magnetic pole is first transmitted to the optical fiber mounting portion, and then the optical fiber mounting portion transmits the temperature to the optical fiber groove, and then the optical fiber groove transmits the temperature to the optical fiber. At this time, the reflected light signal on the grating measuring point will generate a central wavelength offset, and then the reflected light signal is transmitted to the demodulator for analysis to obtain the central wavelength offset, and then the wireless communication device sends the central wavelength offset to the computer in the computer room, and then the computer in the computer room calculates the temperature of the rotor magnetic pole. The advantages of the present invention also include: First point: Optical fiber is used to measure the temperature of the rotor poles. Optical fiber is not subject to electromagnetic interference, so the temperature measurement effect is better; and optical fiber also has the advantages of high voltage resistance, chemical corrosion resistance, high temperature resistance, aging resistance, high sensitivity, fast response speed, low energy consumption, and high precision. It is fully suitable for the strong electric field and strong magnetic field environment where the rotor poles are located. It can accurately measure the real temperature and temperature distribution of the rotor poles online, which is helpful to understand and evaluate the operating conditions and technical performance of the hydro-generator set, and ensure the safe operation of the hydro-generator set; Second point: The magnetic cover is made of special materials for optical fiber temperature measurement, which has good thermal conductivity and hardness, and can accurately transfer the temperature of the rotor pole to the optical fiber, so the optical fiber has a high accuracy in measuring temperature; Third point: The streamlined cover plate includes a slope and a protrusion. The center of gravity of the streamlined cover plate is biased towards the protrusion, which can greatly reduce the influence of the centrifugal force on the optical fiber temperature measurement when the rotor magnetic pole rotates at high speed; the shape of the slope and the protrusion is adapted to the shape of the airflow generated when the rotor magnetic pole rotates, so the wind friction loss and wind resistance of the slope and the protrusion can be effectively reduced, so it will not affect the normal rotation of the rotor magnetic pole; Fourth point: The magnetic cover and the optical fiber are fixed by die-casting technology to form an integrated closed structure, so the optical fiber is better fixed in the magnetic cover, and the optical fiber will not bend or deform in the magnetic cover, so there will be no central wavelength offset caused by optical fiber bending, which further improves the measurement accuracy; Therefore, the temperature measurement effect of the present invention is better and the measurement accuracy is higher.

[0017] 2. In a quasi-distributed fiber Bragg grating temperature monitoring system for rotor magnetic poles of a hydro-turbine generator set of the present invention, the optical fiber includes a first optical fiber and a second optical fiber, the first optical fiber and the second optical fiber are symmetrically distributed along the center of the rotor magnetic pole, the first optical fiber and the second optical fiber have the same structure, the first optical fiber is covered with a protective material, and ten grating measuring points are evenly distributed on the first optical fiber. When used, the ten measuring points are evenly distributed along the first optical fiber, so the temperature of the surface of a rotor magnetic pole can be evenly measured; the temperature of each rotor magnetic pole is similar, so only two optical fibers are needed to complete the temperature measurement of the entire rotor magnetic pole; only two optical fibers are set, and the wiring on the rotor magnetic pole is also less, so the installation process is more convenient. Therefore, the present invention is easy to install.

[0018] 3. In a quasi-distributed fiber Bragg grating temperature monitoring system for the rotor magnetic poles of a hydro-turbine generator set of the present invention, the fixing device includes a fiber optic adapter box, a pipeline clamp and a wiring block, the optical fiber is connected to the fiber optic adapter box, and the other end of the fiber optic adapter box is connected to the transmission optical fiber. The transmission optical fiber is covered with a carbon steel pipe for protection. The transmission optical fiber is connected to the dynamic-static conversion device after passing through the optical splitter and the wiring block in sequence. When in use, when the magnetic cover needs to be replaced, the optical fiber is disconnected from the fiber optic adapter box. At this time, there is no need to replace the overall wiring, so maintenance is convenient; the transmission optical fiber with a carbon steel pipe on the outside is fixed by a pipeline clamp and a wiring block, which ensures the stability of the transmission optical fiber and stabilizes the information transmission in the system. Therefore, the information transmission of the present invention is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle magnetic cover.

[0021] Figure 3 yes Figure 2 Schematic diagram of the structure of the streamlined cover.

[0022] Figure 4 yes Figure 3 Schematic diagram of the structure of the optical fiber mounting plate.

[0023] Figure 5 yes Figure 4 Schematic diagram of the structure of the middle wing panel.

[0024] Figure 6 yes Figure 5 Schematic diagram of the structure of the bolt hole.

[0025] Figure 7 yes Figure 3 Top view of the .

[0026] Figure 8 yes Figure 4 Schematic diagram of the structure of the optical fiber slot.

[0027] Fig. 9 yes Figure 8 Schematic diagram of the structure of optical fiber.

[0028] Fig.10 yes Figure 1 Schematic diagram of the structure of the second optical fiber.

[0029] Fig.11 yes Figure 1 Schematic diagram of the structure of the dynamic-static conversion device.

[0030] Fig.12 yes Figure 1 Schematic diagram of the structure of the wiring block.

[0031] Fig.13 yes Figure 1 Schematic diagram of the structure of the middle pipe clamp.

[0032] In the figure: measuring device 1, demodulator 2, magnetic cover 3, streamlined cover plate 31, slope portion 311, protrusion 312, optical fiber mounting plate 32, optical fiber groove 321, wing plate 33, bolt hole 331, screw 332, optical fiber 4, grating measuring point 41, first optical fiber 42, second optical fiber 43, rotor pole 5, top shaft 51, fixing device 6, optical fiber adapter box 61, pipeline clamp 62, wire insertion hole 621, base 622, cover plate 623, fixing hole 624, fixing screw 625, wiring block 63, wiring groove 631, transmission optical fiber 64, splitter 65, dynamic-static conversion device 7, dynamic part 71, static part 72, wireless communication device 8. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] See also Figure 1 — Fig.13 , a quasi-distributed fiber Bragg grating temperature monitoring system for rotor magnetic poles of a hydro-turbine generator set, the system comprising a measuring device 1 and a demodulator 2; The measuring device 1 includes a magnetic cover 3 and an optical fiber 4. One side of the magnetic cover 3 is a streamlined cover plate 31. The streamlined cover plate 31 includes a slope portion 311 and a protrusion 312. One end of the slope portion 311 along the rotation direction of the rotor pole 5 is connected to one end of the protrusion 312. The other side of the magnetic cover 3 is an optical fiber mounting plate 32. The optical fiber mounting plate 32 is fitted and connected to one side of the rotor pole 5. The optical fiber mounting plate 32 is provided with an optical fiber groove 321 on one side close to the rotor pole 5. The optical fiber 4 is inserted in the optical fiber groove 321. A plurality of grating measuring points 41 are provided on the optical fiber 4. One end of the optical fiber 4 located outside the optical fiber groove 321 is connected to one end of the fixing device 6, and the other end of the fixing device 6 is connected to one end of the dynamic-static conversion device 7. The other end of the dynamic-static conversion device 7 is connected to one end of the demodulator 2 , and the other end of the demodulator 2 is connected to the wireless communication device 8 .

[0035] The magnetic cover 3 includes two wing plates 33, one end of one wing plate 33 is connected to one end of the optical fiber mounting plate 32, and the other wing plate 33 is connected to the other end of the optical fiber mounting plate 32; a plurality of bolt holes 331 are evenly distributed on the wing plate 33, the middle part of the screw 332 is inserted into the bolt hole 331, and the bottom of the screw 332 is inserted into the rotor pole 5.

[0036] The optical fiber 4 includes a first optical fiber 42 and a second optical fiber 43 , and the first optical fiber 42 and the second optical fiber 43 are symmetrically distributed along the center of the rotor pole 5 .

[0037] The first optical fiber 42 and the second optical fiber 43 have the same structure. The first optical fiber 42 is coated with polyetheretherketone, silicone rubber and fluorine material in sequence.

[0038] Eight to ten grating measuring points 41 are evenly distributed on the first optical fiber 42 .

[0039] Ten grating measuring points 41 are evenly distributed on the first optical fiber 42 .

[0040] The fixing device 6 includes a fiber optic adapter box 61, a pipeline clamp 62 and a wiring block 63; one end of the optical fiber 4 located outside the optical fiber groove 321 is connected to one end of the fiber optic adapter box 61, and the other end of the fiber optic adapter box 61 is connected to one end of the transmission optical fiber 64. The transmission optical fiber 64 passes through the pipeline clamp 62 and the wiring block 63 in sequence and is connected to one end of the dynamic-static conversion device 7; the outside of the transmission optical fiber 64 is covered with a carbon steel pipe.

[0041] The pipe clamp 62 includes a wire insertion hole 621, a base 622 and a cover plate 623. The base 622 is connected to one end of the upper surface of the rotor pole 5. The middle part of the base 622 and the cover plate 623 is the wire insertion hole 621. A transmission optical fiber 64 is inserted into the wire insertion hole 621. A fixing hole 624 is provided on the end of the cover plate 623 away from the base 622. The middle part of the fixing screw 625 is inserted into the fixing hole 624, and the bottom of the fixing screw 625 is inserted into the base 622.

[0042] A top shaft 51 is inserted in the middle of the rotor pole 5 , a wiring block 63 is provided on one end of the top shaft 51 close to the rotor pole 5 , a wiring groove 631 is provided in the middle of the wiring block 63 , and the middle part of the transmission optical fiber 64 is inserted in the wiring groove 631 .

[0043] The middle portion of the transmission optical fiber 64 is also connected to a beam splitter 65 , and the beam splitter 65 is located on an extension line of the optical fiber adapter box 61 away from the optical fiber 4 .

[0044] The supplementary description of the present invention is as follows: The demodulator 2 of the present invention is: a device for analyzing the reflected light signal to obtain the center wavelength offset; the demodulator 2 includes 12 channels, each channel can accommodate 10 measuring points, so it can be adapted to the optical fiber 4 including 10 grating measuring points, and the other channels of the 12 channels can be used in conjunction with the monitoring optical fiber for monitoring other parts (such as rotor leads and collector rings); the wavelength measurement range of the demodulator 2 is 1529nm-1569nm, the wavelength measurement range is relatively wide, the absolute wavelength measurement accuracy is 10pm, and the absolute wavelength measurement accuracy is relatively high; the center wavelength offset obtained in the demodulator 2 will be sent to the wireless communication device 8, and then the wireless communication device 8 will send the center wavelength offset to the computing computer to calculate the temperature information of the rotor pole 5. The wireless communication device 8 uses a dedicated frequency band for digital transmission (223-235MHz), has good electromagnetic compatibility, strong anti-interference ability, and extremely low bit error rate, and then displays the temperature change of the rotor pole 5 through the computer.

[0045] Embodiment 1: See also Figure 1 — Fig.13A quasi-distributed fiber Bragg grating temperature monitoring system for rotor magnetic poles of a hydro-turbine generator set, the system comprising a measuring device 1 and a demodulator 2; the measuring device 1 comprises a magnetic cover 3 and an optical fiber 4, one side of the magnetic cover 3 is a streamlined cover plate 31, the streamlined cover plate 31 comprises a slope 311 and a protrusion 312, one end of the slope 311 along the rotation direction of the rotor magnetic pole 5 is connected to one end of the protrusion 312; the other side of the magnetic cover 3 is an optical fiber mounting plate 32, the optical fiber mounting plate 32 is connected to the rotor magnetic pole 5 is attached and connected, a fiber optic mounting plate 32 is provided with a fiber optic groove 321 on a side close to the rotor magnetic pole 5, a fiber optic 4 is inserted in the fiber optic groove 321, a plurality of grating measuring points 41 are provided on the fiber optic 4, one end of the fiber optic 4 outside the fiber optic groove 321 is connected to one end of the fixing device 6, and the other end of the fixing device 6 is connected to one end of the dynamic-static conversion device 7; the other end of the dynamic-static conversion device 7 is connected to one end of the demodulator 2, and the other end of the demodulator 2 is connected to the wireless communication device 8. The magnetic cover 3 includes two wing plates 33, one end of one wing plate 33 is connected to one end of the fiber optic mounting plate 32, and the other wing plate 33 is connected to the other end of the fiber optic mounting plate 32; a plurality of bolt holes 331 are evenly distributed on the wing plate 33, the middle part of the screw 332 is inserted in the bolt hole 331, and the bottom of the screw 332 is inserted into the rotor magnetic pole 5. Preferably, the thickness of the protrusion 312 is less than or equal to fifteen millimeters.

[0046] When in use, firstly, a hole is punched at a position corresponding to the bolt hole 331 on a rotor pole 5, and then the optical fiber mounting plate 32 is aligned with the outer side of the rotor pole 5, and then the two wing plates 33 are respectively inserted into the two sides of a rotor pole 5, and then the screws 332 are inserted into the bolt holes 331 and the rotor pole 5 in turn, so that the magnetic cover 3 and the rotor pole 5 can be connected; then the demodulator 2 sends out an incident light signal, and then the incident light signal reaches the optical fiber 4 through the dynamic-static conversion device 7, and the grating measuring point 41 generates a reflected light signal from the incident light signal; when the temperature of the rotor pole 5 increases, the rotor pole 5 The pole 5 transmits the temperature to the optical fiber installation plate 32, and the optical fiber installation plate 32 transmits the temperature to the optical fiber groove 321, and then the optical fiber groove 32 transmits the temperature to the grating measuring point 41. The length of the grating measuring point 41 becomes larger, so the reflected light signal will produce a central wavelength offset, and then the reflected light signal is transmitted to the demodulator 2 through the dynamic-static conversion device 7, and then the demodulator 2 demodulates the reflected light signal into a central wavelength offset, and then the wireless communication device 8 receives the central wavelength offset, and then the wireless communication device 8 sends the central wavelength offset to the computer in the computer room, and then the computer room calculates The temperature of the rotor pole 5 is calculated according to the central wavelength offset; when the rotor pole 5 is working, it maintains a high-speed rotation state. Taking the rotor pole 5 as an example of clockwise rotation when viewed from above, the airflow generated by the rotor pole 5 flows along the slope 311 to the protrusion 312. The slope 311 and the protrusion 312 form a good match with the airflow shape, so the wind friction loss and wind resistance can be reduced; because the volume of the protrusion 312 is larger than the slope 311, the center of gravity of the streamlined cover plate 31 is biased toward the protrusion 312, and the center of gravity bias can greatly reduce the centrifugal force of the rotor pole 5 when it rotates at a high speed. The force caused by the optical fiber 4 prevents the grating measuring point 41 from being deformed due to external force, thereby improving the measurement accuracy of the grating measuring point 41 for temperature; the thickness of the protrusion 312 is less than or equal to fifteen millimeters, so the protrusion 312 can be inserted into the gap between the rotor pole 5 and the stator, and will not affect the effect of the rotor pole 5 rotating in the stator; the dynamic-static conversion device 7 includes a dynamic part 71 and a static part 72, the dynamic part 71 rotates together with the rotating shaft 51, the dynamic part 71 transmits the reflected light signal to the static part 72, and the static part 72 transmits the reflected light signal to the demodulator 2.

[0047] Embodiment 2: The basic content is the same as that of Example 1, except that: See also Figure 1 — Fig.10, the optical fiber 4 includes a first optical fiber 42 and a second optical fiber 43, and the first optical fiber 42 and the second optical fiber 43 are symmetrically distributed along the center of the rotor pole 5. The first optical fiber 42 and the second optical fiber 43 have the same structure, and the outside of the first optical fiber 42 is wrapped with polyetheretherketone, silicone rubber and fluorine material in sequence. Eight to ten grating measurement points 41 are evenly distributed on the first optical fiber 42. Ten grating measurement points 41 are evenly distributed on the first optical fiber 42. Preferably, the shape of the optical fiber 4 in the optical fiber groove 321 is "U"-shaped.

[0048] When used, the first optical fiber 42 and the second optical fiber 43 are symmetrically distributed along the center of the rotor magnetic pole 5, so the temperature of the rotor magnetic pole 5 that is 180 degrees opposite to each other can be measured, and the temperatures measured by the first optical fiber 42 and the second optical fiber 43 can be mutually verified and confirmed to improve the measurement accuracy of the temperature; because the temperature of each rotor magnetic pole 5 is similar, there is no need to use more optical fibers 4 to measure the rotor magnetic pole 5; the first optical fiber 42 and the second optical fiber 43 have the same structure, and there are ten grating measurement points 41 evenly distributed on the first optical fiber 42, so the temperature of the rotor magnetic pole 5 can be measured. The temperature is measured at ten positions, and the first optical fiber 42 is in a "U" shape to achieve all-round measurement of the rotor pole 5 from top to bottom and from left to right. The optical fiber 4 can also be designed into a required shape as needed in the future; the outside of the first optical fiber 42 is wrapped with polyetheretherketone, silicone rubber and fluorine materials in sequence. Because polyetheretherketone, silicone rubber and fluorine materials have a lower thermal expansion coefficient and higher thermal conductivity, the temperature of the rotor pole 5 can be better measured. Moreover, polyetheretherketone, silicone rubber and fluorine materials also form a packaging protection for the first optical fiber 42.

[0049] Embodiment 3: The basic content is the same as that of Example 1, except that: See also Figure 1 — Fig.13The fixing device 6 includes an optical fiber adapter box 61, a pipeline clamp 62 and a wiring block 63; one end of the optical fiber 4 located outside the optical fiber groove 321 is connected to one end of the optical fiber adapter box 61, and the other end of the optical fiber adapter box 61 is connected to one end of the transmission optical fiber 64. The transmission optical fiber 64 passes through the pipeline clamp 62 and the wiring block 63 in sequence and is connected to one end of the dynamic-static conversion device 7; the outer surface of the transmission optical fiber 64 is covered with a carbon steel pipe. The pipeline clamp 62 includes a wire insertion hole 621, a base 622 and a cover plate 623. The base 622 is connected to one end of the upper surface of the rotor magnetic pole 5. The middle part of the base 622 and the cover plate 623 is a wire insertion hole 621, and the transmission optical fiber 64 is inserted in the wire insertion hole 621. The cover plate 623 is provided with a fixing hole 624 on the end away from the base 622. The middle part of the fixing screw 625 is inserted in the fixing hole 624, and the bottom of the fixing screw 625 is inserted into the base 622. A top shaft 51 is inserted in the middle of the rotor pole 5, and a wiring block 63 is provided on one end of the top shaft 51 close to the rotor pole 5. A wiring groove 631 is provided in the middle of the wiring block 63, and the middle part of the transmission optical fiber 64 is inserted in the wiring groove 631. The middle part of the transmission optical fiber 64 is also connected to the optical splitter 65, and the optical splitter 65 is located on the extension line of the optical fiber adapter box 61 away from the optical fiber 4.

[0050] When in use, one end of the optical fiber 4 located outside the optical fiber groove 321 is connected to one end of the optical fiber adapter box 61 to realize the combination of the incident light signal and the reflected light signal; the middle part of the transmission optical fiber 64 is first fixed by the pipeline clamp 62. The specific process is to first remove the fixing screws 625 from the fixing holes 624 in turn, then remove the cover plate 623, and then place the transmission optical fiber 64 with the carbon steel pipe on the outside into the plug hole 621, and then align the cover plate 623 with the base 622, and then screw the fixing screws 625 into the fixing holes 624 in turn, so that the transmission optical fiber 64 with the carbon steel pipe on the outside can be connected to the pipe. The wire clamp 62 is fixed, and the bottom of the base 622 is welded to the top of the rotor pole 5. The number, position and height of the base 622 can be set as needed, and the transmission optical fiber 64 should remain in a horizontal state; then the transmission optical fiber 64 with a carbon steel tube cover on the outside is connected to the spectrometer 65, and the spectrometer 65 can integrate the monitoring optical fiber for monitoring other parts (such as rotor leads and collector rings); then the transmission optical fiber 64 with a carbon steel tube cover on the outside is inserted into the wiring groove 631 to fix the transmission optical fiber 64 and the top shaft 51, and then the transmission optical fiber 64 with a carbon steel tube cover on the outside is introduced into the dynamic-static conversion device 7.

[0051] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A quasi-distributed fiber Bragg grating temperature monitoring system for rotor magnetic poles of a hydro-generator set, characterized in that: The system comprises a measuring device (1) and a demodulator (2); The measuring device (1) comprises a magnetic cover (3) and an optical fiber (4); one side of the magnetic cover (3) is a streamlined cover plate (31); the streamlined cover plate (31) comprises a slope portion (311) and a protrusion portion (312); one end of the slope portion (311) along the rotation direction of the rotor magnetic pole (5) is connected to one end of the protrusion portion (312); the other side of the magnetic cover (3) is an optical fiber mounting plate (32); the optical fiber mounting plate (32) is bonded to one side of the rotor magnetic pole (5); a side of the optical fiber mounting plate (32) close to the rotor magnetic pole (5) is provided with an optical fiber groove (321); an optical fiber (4) is inserted into the optical fiber groove (321); a plurality of grating measuring points (41) are provided on the optical fiber (4); one end of the optical fiber (4) located outside the optical fiber groove (321) is connected to one end of a fixing device (6); and the other end of the fixing device (6) is connected to one end of a dynamic-static conversion device (7); The other end of the static-dynamic conversion device (7) is connected to one end of the demodulator (2), and the other end of the demodulator (2) is connected to the wireless communication device (8).

2. A hydro-generator rotor magnetic pole quasi-distributed fiber Bragg grating temperature monitoring system according to claim 1, characterized in that: The magnetic cover (3) comprises two wing plates (33), one end of one wing plate (33) is connected to one end of the optical fiber mounting plate (32), and the other wing plate (33) is connected to the other end of the optical fiber mounting plate (32); a plurality of bolt holes (331) are evenly distributed on the wing plate (33), the middle part of a screw (332) is inserted into the bolt hole (331), and the bottom of the screw (332) is inserted into the rotor pole (5).

3. A hydro-generator rotor magnetic pole quasi-distributed fiber Bragg grating temperature monitoring system according to claim 1 or 2, characterized in that: The optical fiber (4) comprises a first optical fiber (42) and a second optical fiber (43), and the first optical fiber (42) and the second optical fiber (43) are symmetrically distributed along the center of the rotor magnetic pole (5).

4. A hydro-generator rotor magnetic pole quasi-distributed fiber Bragg grating temperature monitoring system according to claim 3, characterized in that: The first optical fiber (42) and the second optical fiber (43) have the same structure, and the exterior of the first optical fiber (42) is coated with polyetheretherketone, silicone rubber and fluorine material in sequence.

5. A hydro-generator rotor magnetic pole quasi-distributed fiber Bragg grating temperature monitoring system according to claim 4, characterized in that: Eight to ten grating measurement points (41) are evenly distributed on the first optical fiber (42).

6. A hydro-generator rotor magnetic pole quasi-distributed fiber Bragg grating temperature monitoring system according to claim 5, characterized in that: Ten grating measurement points (41) are evenly distributed on the first optical fiber (42).

7. A hydro-generator rotor magnetic pole quasi-distributed fiber Bragg grating temperature monitoring system according to claim 1 or 2, characterized in that: The fixing device (6) comprises an optical fiber adapter box (61), a pipeline clamp (62) and a wiring block (63); one end of the optical fiber (4) located outside the optical fiber groove (321) is connected to one end of the optical fiber adapter box (61), and the other end of the optical fiber adapter box (61) is connected to one end of a transmission optical fiber (64); the transmission optical fiber (64) passes through the pipeline clamp (62) and the wiring block (63) in sequence and is connected to one end of the dynamic-static conversion device (7); the outside of the transmission optical fiber (64) is covered with a carbon steel pipe.

8. A hydro-generator rotor magnetic pole quasi-distributed fiber Bragg grating temperature monitoring system according to claim 7, characterized in that: The pipe clamp (62) comprises a wire insertion hole (621), a base (622) and a cover plate (623); the base (622) is connected to one end of the upper surface of the rotor magnetic pole (5); the middle parts of the base (622) and the cover plate (623) are wire insertion holes (621); a transmission optical fiber (64) is inserted into the wire insertion holes (621); a fixing hole (624) is provided on one end of the cover plate (623) away from the base (622); the middle part of a fixing screw (625) is inserted into the fixing hole (624); and the bottom of the fixing screw (625) is inserted into the base (622).

9. A hydro-generator rotor magnetic pole quasi-distributed fiber Bragg grating temperature monitoring system according to claim 8, characterized in that: A top shaft (51) is inserted into the middle of the rotor magnetic pole (5), a wiring block (63) is provided on one end of the top shaft (51) close to the rotor magnetic pole (5), a wiring groove (631) is provided in the middle of the wiring block (63), and the middle part of the transmission optical fiber (64) is inserted into the wiring groove (631).

10. A hydro-generator rotor magnetic pole quasi-distributed fiber Bragg grating temperature monitoring system according to claim 9, characterized in that: The middle portion of the transmission optical fiber (64) is also connected to a light splitter (65), and the light splitter (65) is located on an extension line of a side of the optical fiber switching box (61) away from the optical fiber (4).

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