CN114884280B - Rotor coil temperature measuring device - Google Patents
Rotor coil temperature measuring device Download PDFInfo
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- CN114884280B CN114884280B CN202210458942.9A CN202210458942A CN114884280B CN 114884280 B CN114884280 B CN 114884280B CN 202210458942 A CN202210458942 A CN 202210458942A CN 114884280 B CN114884280 B CN 114884280B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/25—Devices for sensing temperature, or actuated thereby
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/35—Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a rotor coil temperature measuring device, which belongs to the technical field of hydroelectric generation, and comprises a computer and a temperature measuring optical fiber arranged on a rotor, and is characterized in that: the temperature measuring optical fiber is connected with the demodulator, the receiver is connected with the hub, the hub is connected with the computer, the receiving end of the optical terminal is connected with the computer, the transmitting end of the optical terminal is connected with the receiving end of the optical terminal, the transmitting end of the optical terminal is connected with the Ethernet exchanger, and the Ethernet exchanger is connected with the upper computer server. The temperature measuring loop disclosed by the invention has a relatively simple structure and a relatively simple temperature measuring principle, is short, optimizes layout according to the characteristics of the high-speed generator motor, has good anti-interference performance and safety, and can ensure temperature measuring reliability and temperature measuring precision.
Description
Technical Field
The invention relates to the technical field of hydroelectric generation, in particular to a rotor coil temperature measuring device.
Background
The rotor coil of the hydraulic generator is an important part for generating electromagnetic reaction of the generator, and is a larger heating element in the running process of the unit, and the temperature rise of the heating element directly influences the safe running of the unit. At present, the rotor temperature is estimated basically according to the magnitude of the rotor current, only the average temperature rise of the whole rotor coil can be reflected indirectly, and the local heating of the rotor coil cannot be reflected directly. The rotor coil of the hydraulic generator is a large inductance coil, if a rotor loop is short-circuited, the rotor current is gradually attenuated, and the rotor current cannot react on the stator voltage, the current, including the rotor voltage and the current of the generator in short time, so that relay protection of the change of the reactive electric quantity cannot react in short time, and only when the insulation of the arc burning coil is developed and a rotor grounding alarm signal appears, on-site operation and maintenance personnel can carry out load transferring shutdown treatment, so that damage of the rotor coil is increased, and especially, a part of the rotor coil or a magnetic pole lead head burnt by the arc can be thrown out directly before shutdown to cause the sweeping of a bore, so that a stator bar is damaged. If the temperature rise abnormality of the rotor coil can be monitored on line in real time, the shutdown check can be directly carried out. Therefore, online real-time monitoring of rotor coils is particularly important.
The Chinese patent literature with publication number of CN203949744U and publication date of 2014, 11 month and 19 discloses a temperature measuring device for a rotor coil of a large-sized hydraulic generator, a temperature sensor Pt100 platinum thermal resistor is arranged at a measuring position required by the rotor coil, an output signal of the temperature sensor is connected to a signal input end of a data acquisition recorder fixed on a generator rotor through a cable, and data transmission is realized by the data acquisition recorder and a wireless data transmission module arranged on the generator rotor through an industrial bus.
The principle of the temperature measuring device for the rotor coil of the large-sized hydraulic generator disclosed in the patent document is that the platinum thermal resistor is used for measuring the temperature, a temperature signal is transmitted based on electric quantity, and the signal is led out by a cable; the structural probe is large, difficult to fix and completely unsuitable for a high-rotation-speed unit; moreover, the anti-interference capability is weak when the electromagnetic field is applied to a strong electromagnetic field.
The Chinese patent literature with publication number of CN206945170U and publication date of 2018, 01 and 30 discloses a variable-speed generator motor rotor three-phase alternating current excitation bar optical fiber temperature measuring device, which is characterized by comprising a wired communication system and a wireless communication system which share an optical fiber thermometer, an optical fiber signal regulator, an internal communication cable, an internal power cable, an external communication cable, an external power cable and an optical fiber temperature measuring control cabinet, wherein one end of the optical fiber thermometer is embedded between an upper rotor bar and a lower rotor bar, and the other end of the optical fiber thermometer is connected with the optical fiber signal regulator; one end of the internal communication cable is connected with the optical fiber signal regulator, and the other end of the internal communication cable is divided into two paths, and is respectively connected with the wired communication system and the wireless communication system; one end of the internal power cable is connected with the optical fiber signal regulator, and the other end of the internal power cable is divided into two paths, and is respectively connected with the wired communication system and the wireless communication system; one end of the external communication cable is connected with the optical fiber temperature measurement control cabinet, and the other end of the external communication cable is divided into two paths, and is respectively connected with the wired communication system and the wireless communication system; one end of the external power cable is connected to the optical fiber temperature measurement control cabinet, and the other end of the external power cable is divided into two paths, and is connected to the wired communication system and the wireless communication system respectively.
The variable-speed generator motor rotor three-phase alternating current excitation bar optical fiber temperature measuring device disclosed in the patent document is transmitted in a wired communication system and a wireless communication system, and the reliability and the accuracy of temperature signal output are improved. However, the fiber thermometer is embedded in the interlayer filler strip between the upper and lower bars of the rotor, and the measured direct temperature is not the copper wire, and can only be used on the rotor AC excitation bar of the variable speed generator motor. For a constant-speed generator motor, the structural form of a magnetic pole coil is completely different from that of a rotor alternating current excitation bar on the variable-speed generator motor, and the stator alternating current excitation bar does not have installation conditions; in addition, the optical fiber signal regulator is powered by the slip ring and the carbon brush, the power supply loop is quite complex in structure, the power taking line is too long, and short circuit caused by insulation break is easy to occur in a high-rotation-speed unit.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the rotor coil temperature measuring device, the temperature measuring loop structure and the temperature measuring principle are relatively simple, the loop is short, the layout is optimized according to the characteristics of the high-speed generator motor, the rotor coil temperature measuring device has good anti-interference performance and safety, and the temperature measuring reliability and the temperature measuring precision can be ensured.
The invention is realized by the following technical scheme:
the utility model provides a rotor coil temperature measuring device, includes computer and sets up the temperature measurement optic fibre on the rotor, its characterized in that: the optical terminal for transmitting data and the optical terminal for receiving data are connected with the hub through a communication cable, the receiving end of the optical terminal is connected with the computer through a communication cable, the transmitting end of the optical terminal is connected with the receiving end of the optical terminal through an optical cable, the transmitting end of the optical terminal is connected with the Ethernet switch through an optical cable, and the Ethernet switch is connected with the upper computer server through a communication cable.
The plurality of receivers are uniformly distributed along the circumferential direction of the stator.
The temperature measuring optical fiber comprises a temperature measuring probe and a temperature measuring lead wire connected to the temperature measuring probe, a chute is formed in a copper bar of the rotor coil, the temperature measuring probe is embedded into the chute, heat-resistant sealant is arranged in the chute, and the temperature measuring probe is sealed through the heat-resistant sealant.
The fixed box is provided with a cover for packaging the demodulator and isolating the power supply.
The cover is provided with a bolt hole, the bolt hole is connected with a bolt, the cover is provided with a stop washer, and the cover is fixed on the fixed box through the bolt and the stop washer.
The isolation power supply is used for outputting voltage and current to supply power to the demodulator with the transmitter.
The demodulator is used for decoding the output signal of the temperature measuring optical fiber and transmitting the rotor coil temperature signal obtained by decoding to the receiver through the transmitter.
And the hub is used for collecting the temperature signals sent by the receiver and sending the temperature signals to the computer.
The computer is used for recording the real-time temperature of each group of coils of the generator rotor at any time on line, comparing the real-time temperature with the preset normal temperature, and alarming after the real-time temperature exceeds the preset normal temperature.
The beneficial effects of the invention are mainly shown in the following aspects:
1. the invention, the isolated power is connected with demodulator and rotor lead wire through the power cable separately, there are transmitters in the said demodulator, the said temperature measurement optic fibre is connected with demodulator, the said receiver is connected with hub through the communication cable, the hub is connected with computer, the receiving end of the said optical terminal is connected with computer through the communication cable, the sending end of the optical terminal is connected with receiving end of the optical terminal machine through the optical cable, the sending end of the optical terminal machine is connected with Ethernet exchanger through the optical cable, the Ethernet exchanger is connected with upper computer server through the communication cable, compared with the prior art, the temperature measurement loop structure and temperature measurement principle are relatively simple, the loop is brief, and according to the characteristic of the high-speed generator motor, optimize the overall arrangement, have good interference immunity and security, can ensure the reliability of temperature measurement and temperature measurement precision.
2. According to the invention, a plurality of receivers are uniformly arranged along the circumferential direction of the stator, so that stable and reliable reception of the temperature signals converted by the demodulator can be ensured.
3. According to the invention, the temperature measuring optical fiber comprises the temperature measuring probe and the temperature measuring lead wire connected to the temperature measuring probe, the copper bar of the rotor coil is provided with the chute, the temperature measuring probe is embedded into the chute, the chute is provided with the heat-resistant sealant, the temperature measuring probe is sealed by the heat-resistant sealant, the damage of the temperature measuring lead wire due to an overlarge bending angle can be avoided, and the copper temperature of the rotor coil can be directly and stably measured when the unit operates.
4. According to the invention, the cover for packaging the demodulator and the isolation power supply is arranged on the fixed box, so that the demodulator and the isolation power supply can be prevented from shaking when the unit operates, and the stability is ensured.
5. According to the invention, the bolt hole is formed in the cover, the bolt is connected to the bolt hole, the stop washer is arranged on the cover, and the cover is fixed on the fixed box through the bolt and the stop washer, so that the demodulator and the isolation power supply can be firmly fixed, and the working stability and the safety are ensured.
6. The invention is used for outputting voltage and current to supply power to the demodulator with the transmitter, the isolation power supply directly takes power from the rotor lead wire to supply power to the demodulator, the isolation power supply also has overvoltage, overcurrent and overheat protection functions without additionally adding a collecting ring disc and an electric brush, the isolation power supply can also change input polarity according to the needs, the power taking mode is simple and reliable, the actual operation needs of a unit are fully met, and the whole temperature measuring loop structure is facilitated to be simplified.
7. The demodulator is used for decoding the output signal of the temperature measuring optical fiber, transmitting the decoded rotor coil temperature signal to the receiver through the transmitter, and ensuring stable transmission of the decoded rotor coil temperature signal to the receiver by arranging the demodulator in the whole temperature measuring loop.
8. The computer is used for recording the real-time temperature of each group of coils of the generator rotor at any time on line, comparing the real-time temperature with the preset normal temperature, and alarming after the real-time temperature exceeds the preset normal temperature, so that the running stability of the whole unit can be effectively ensured.
Drawings
The invention will be further described in detail with reference to the drawings and detailed description, wherein:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the present invention mounted on a partial rotor;
FIG. 3 is a schematic structural view of the fixing case of the present invention;
FIG. 4 is a schematic diagram of a rotor coil according to the present invention;
FIG. 5 is an enlarged view of FIG. 4 at A;
the marks in the figure: 1. the temperature measuring optical fiber device comprises a computer, 2, a temperature measuring optical fiber, 3, a receiver, 4, a hub, 5, a fixed box, 6, a demodulator, 7, an isolated power supply, 8, a rotor coil, 9, a rotor lead, 10, a transmitter, 11, a temperature measuring probe, 12, a temperature measuring lead, 13, a chute, 14, a cover, 15, a bolt, 16, a stop washer, 17, an Ethernet switch, 18, an upper computer server, 19, an optical terminal, 20 and an optical transceiver.
Detailed Description
Example 1
Referring to fig. 1-3, a rotor coil temperature measuring device comprises a computer 1, a temperature measuring optical fiber 2 arranged on a rotor, an ethernet switch 17, an upper computer server 18, an optical terminal 19 for transmitting data, an optical terminal 20 for receiving data, a receiver 3 and a hub 4 fixed on a stator, a fixed box 5 fixed on a rotor support, a demodulator 6 and an isolation power supply 7 arranged in the fixed box 5, wherein the rotor comprises a rotor coil 8 and a rotor lead 9 connected with the rotor coil 8, the isolation power supply 7 is respectively connected with the demodulator 6 and the rotor lead 9 through a power cable, a transmitter 10 is arranged in the demodulator 6, the temperature measuring optical fiber 2 is connected with the demodulator 6, the receiver 3 is connected with the hub 4 through a communication cable, the hub 4 is connected with the computer 1, a receiving end of the optical terminal 19 is connected with the computer 1 through a communication cable, a transmitting end of the optical terminal 19 is connected with a receiving end of the optical terminal 20 through an optical cable, and a transmitting end of the optical terminal 20 is connected with the ethernet switch 17 through an optical cable, and the ethernet switch 17 is connected with the ethernet switch 18 through the communication cable.
In this embodiment, the isolation power supply 7 is respectively connected with the demodulator 6 and the rotor lead 9 through a power cable, the transmitter 10 is disposed in the demodulator 6, the temperature measuring optical fiber 2 is connected with the demodulator 6, the receiver 3 is connected with the hub 4 through a communication cable, the hub 4 is connected with the computer 1, the receiving end of the optical terminal 19 is connected with the computer 1 through a communication cable, the transmitting end of the optical terminal 19 is connected with the receiving end of the optical terminal 20 through an optical cable, the transmitting end of the optical terminal 20 is connected with the ethernet switch 17 through an optical cable, and the ethernet switch 17 is connected with the upper computer server 18 through a communication cable.
Example 2
Referring to fig. 1-3, a rotor coil temperature measuring device comprises a computer 1, a temperature measuring optical fiber 2 arranged on a rotor, an ethernet switch 17, an upper computer server 18, an optical terminal 19 for transmitting data, an optical terminal 20 for receiving data, a receiver 3 and a hub 4 fixed on a stator, a fixed box 5 fixed on a rotor support, a demodulator 6 and an isolation power supply 7 arranged in the fixed box 5, wherein the rotor comprises a rotor coil 8 and a rotor lead 9 connected with the rotor coil 8, the isolation power supply 7 is respectively connected with the demodulator 6 and the rotor lead 9 through a power cable, a transmitter 10 is arranged in the demodulator 6, the temperature measuring optical fiber 2 is connected with the demodulator 6, the receiver 3 is connected with the hub 4 through a communication cable, the hub 4 is connected with the computer 1, a receiving end of the optical terminal 19 is connected with the computer 1 through a communication cable, a transmitting end of the optical terminal 19 is connected with a receiving end of the optical terminal 20 through an optical cable, and a transmitting end of the optical terminal 20 is connected with the ethernet switch 17 through an optical cable, and the ethernet switch 17 is connected with the ethernet switch 18 through the communication cable.
The number of the receivers 3 is plural, and the plurality of the receivers 3 are uniformly arranged along the circumferential direction of the stator.
In this embodiment, a plurality of receivers 3 are provided, and the plurality of receivers 3 are uniformly arranged along the circumferential direction of the stator, so that stable and reliable reception of the temperature signal converted by the demodulator 6 can be ensured.
Example 3
Referring to fig. 1-5, a rotor coil temperature measuring device comprises a computer 1, a temperature measuring optical fiber 2 arranged on a rotor, an ethernet switch 17, an upper computer server 18, an optical terminal 19 for transmitting data, an optical terminal 20 for receiving data, a receiver 3 and a hub 4 fixed on a stator, a fixed box 5 fixed on a rotor support, a demodulator 6 and an isolation power supply 7 arranged in the fixed box 5, wherein the rotor comprises a rotor coil 8 and a rotor lead 9 connected with the rotor coil 8, the isolation power supply 7 is respectively connected with the demodulator 6 and the rotor lead 9 through a power cable, a transmitter 10 is arranged in the demodulator 6, the temperature measuring optical fiber 2 is connected with the demodulator 6, the receiver 3 is connected with the hub 4 through a communication cable, the hub 4 is connected with the computer 1, a receiving end of the optical terminal 19 is connected with the computer 1 through a communication cable, a transmitting end of the optical terminal 19 is connected with a receiving end of the optical terminal 20 through an optical cable, and a transmitting end of the optical terminal 20 is connected with the ethernet switch 17 through an optical cable, and the ethernet switch 17 is connected with the ethernet switch 18 through the communication cable.
The number of the receivers 3 is plural, and the plurality of the receivers 3 are uniformly arranged along the circumferential direction of the stator.
The temperature measuring optical fiber 2 comprises a temperature measuring probe 11 and a temperature measuring lead 12 connected to the temperature measuring probe 11, a chute 13 is formed in a copper bar of the rotor coil 8, the temperature measuring probe 11 is embedded into the chute 13, heat-resistant sealant is arranged in the chute 13, and the temperature measuring probe 11 is sealed through the heat-resistant sealant.
In this embodiment, the temperature measuring optical fiber 2 includes a temperature measuring probe 11 and a temperature measuring lead 12 connected to the temperature measuring probe 11, a chute 13 is formed on the copper bar of the rotor coil 8, the temperature measuring probe 11 is embedded into the chute 13, a heat-resistant sealant is disposed in the chute 13, the temperature measuring probe 11 is sealed by the heat-resistant sealant, damage of the temperature measuring lead 12 due to an excessive bending angle can be avoided, and the copper temperature of the rotor coil 8 can be directly and stably measured during operation of the unit.
Example 4
Referring to fig. 1-5, a rotor coil temperature measuring device comprises a computer 1, a temperature measuring optical fiber 2 arranged on a rotor, an ethernet switch 17, an upper computer server 18, an optical terminal 19 for transmitting data, an optical terminal 20 for receiving data, a receiver 3 and a hub 4 fixed on a stator, a fixed box 5 fixed on a rotor support, a demodulator 6 and an isolation power supply 7 arranged in the fixed box 5, wherein the rotor comprises a rotor coil 8 and a rotor lead 9 connected with the rotor coil 8, the isolation power supply 7 is respectively connected with the demodulator 6 and the rotor lead 9 through a power cable, a transmitter 10 is arranged in the demodulator 6, the temperature measuring optical fiber 2 is connected with the demodulator 6, the receiver 3 is connected with the hub 4 through a communication cable, the hub 4 is connected with the computer 1, a receiving end of the optical terminal 19 is connected with the computer 1 through a communication cable, a transmitting end of the optical terminal 19 is connected with a receiving end of the optical terminal 20 through an optical cable, and a transmitting end of the optical terminal 20 is connected with the ethernet switch 17 through an optical cable, and the ethernet switch 17 is connected with the ethernet switch 18 through the communication cable.
The number of the receivers 3 is plural, and the plurality of the receivers 3 are uniformly arranged along the circumferential direction of the stator.
The temperature measuring optical fiber 2 comprises a temperature measuring probe 11 and a temperature measuring lead 12 connected to the temperature measuring probe 11, a chute 13 is formed in a copper bar of the rotor coil 8, the temperature measuring probe 11 is embedded into the chute 13, heat-resistant sealant is arranged in the chute 13, and the temperature measuring probe 11 is sealed through the heat-resistant sealant.
The fixed case 5 is provided with a cover 14 for packaging the demodulator 6 and the isolated power supply 7.
The cover 14 is provided with a bolt hole, a bolt 15 is connected to the bolt hole, a stop washer 16 is arranged on the cover 14, and the cover 14 is fixed on the fixed box 5 through the bolt 15 and the stop washer 16.
In this embodiment, a cover 14 for packaging the demodulator 6 and the isolation power supply 7 is provided on the fixed box 5, so that the demodulator 6 and the isolation power supply 7 can be prevented from shaking during operation of the unit, and stability is ensured.
The cover 14 is provided with a bolt hole, the bolt hole is connected with a bolt 15, the cover 14 is provided with a stop washer 16, the cover 14 is fixed on the fixed box 5 through the bolt 15 and the stop washer 16, the demodulator 6 and the isolation power supply 7 can be firmly fixed, and the working stability and the safety are ensured.
Example 5
Referring to fig. 1-5, a rotor coil temperature measuring device comprises a computer 1, a temperature measuring optical fiber 2 arranged on a rotor, an ethernet switch 17, an upper computer server 18, an optical terminal 19 for transmitting data, an optical terminal 20 for receiving data, a receiver 3 and a hub 4 fixed on a stator, a fixed box 5 fixed on a rotor support, a demodulator 6 and an isolation power supply 7 arranged in the fixed box 5, wherein the rotor comprises a rotor coil 8 and a rotor lead 9 connected with the rotor coil 8, the isolation power supply 7 is respectively connected with the demodulator 6 and the rotor lead 9 through a power cable, a transmitter 10 is arranged in the demodulator 6, the temperature measuring optical fiber 2 is connected with the demodulator 6, the receiver 3 is connected with the hub 4 through a communication cable, the hub 4 is connected with the computer 1, a receiving end of the optical terminal 19 is connected with the computer 1 through a communication cable, a transmitting end of the optical terminal 19 is connected with a receiving end of the optical terminal 20 through an optical cable, and a transmitting end of the optical terminal 20 is connected with the ethernet switch 17 through an optical cable, and the ethernet switch 17 is connected with the ethernet switch 18 through the communication cable.
The number of the receivers 3 is plural, and the plurality of the receivers 3 are uniformly arranged along the circumferential direction of the stator.
The temperature measuring optical fiber 2 comprises a temperature measuring probe 11 and a temperature measuring lead 12 connected to the temperature measuring probe 11, a chute 13 is formed in a copper bar of the rotor coil 8, the temperature measuring probe 11 is embedded into the chute 13, heat-resistant sealant is arranged in the chute 13, and the temperature measuring probe 11 is sealed through the heat-resistant sealant.
The fixed case 5 is provided with a cover 14 for packaging the demodulator 6 and the isolated power supply 7.
The cover 14 is provided with a bolt hole, a bolt 15 is connected to the bolt hole, a stop washer 16 is arranged on the cover 14, and the cover 14 is fixed on the fixed box 5 through the bolt 15 and the stop washer 16.
The isolated power supply 7 is used for outputting voltage and current to supply power to the demodulator 6 with the transmitter 10.
The demodulator 6 is configured to decode the output signal of the thermometric optical fiber 2, and transmit the temperature signal of the rotor coil 8 obtained by decoding to the receiver 3 through the transmitter 10.
In this embodiment, the isolation power supply 7 is used for outputting voltage and current to power the demodulator 6 with the transmitter 10, the isolation power supply 7 directly takes power from the rotor lead 9 to power the demodulator 6, no additional collecting ring disc or brush is needed, the isolation power supply 7 also has overvoltage, overcurrent and overheat protection functions, the input polarity of the isolation power supply 7 can be changed as required, the power taking mode is simple and reliable, the actual operation requirement of the unit is fully met, and the whole temperature measurement loop structure is facilitated to be simplified.
The demodulator 6 is configured to decode the output signal of the thermometric optical fiber 2, and transmit the decoded temperature signal of the rotor coil 8 to the receiver 3 through the transmitter 10, and by providing the demodulator 6 in the entire thermometric circuit, it is possible to ensure stable transmission of the decoded temperature signal of the rotor coil 8 to the receiver 3.
Example 6
Referring to fig. 1-5, a rotor coil temperature measuring device comprises a computer 1, a temperature measuring optical fiber 2 arranged on a rotor, an ethernet switch 17, an upper computer server 18, an optical terminal 19 for transmitting data, an optical terminal 20 for receiving data, a receiver 3 and a hub 4 fixed on a stator, a fixed box 5 fixed on a rotor support, a demodulator 6 and an isolation power supply 7 arranged in the fixed box 5, wherein the rotor comprises a rotor coil 8 and a rotor lead 9 connected with the rotor coil 8, the isolation power supply 7 is respectively connected with the demodulator 6 and the rotor lead 9 through a power cable, a transmitter 10 is arranged in the demodulator 6, the temperature measuring optical fiber 2 is connected with the demodulator 6, the receiver 3 is connected with the hub 4 through a communication cable, the hub 4 is connected with the computer 1, a receiving end of the optical terminal 19 is connected with the computer 1 through a communication cable, a transmitting end of the optical terminal 19 is connected with a receiving end of the optical terminal 20 through an optical cable, and a transmitting end of the optical terminal 20 is connected with the ethernet switch 17 through an optical cable, and the ethernet switch 17 is connected with the ethernet switch 18 through the communication cable.
The number of the receivers 3 is plural, and the plurality of the receivers 3 are uniformly arranged along the circumferential direction of the stator.
The temperature measuring optical fiber 2 comprises a temperature measuring probe 11 and a temperature measuring lead 12 connected to the temperature measuring probe 11, a chute 13 is formed in a copper bar of the rotor coil 8, the temperature measuring probe 11 is embedded into the chute 13, heat-resistant sealant is arranged in the chute 13, and the temperature measuring probe 11 is sealed through the heat-resistant sealant.
The fixed case 5 is provided with a cover 14 for packaging the demodulator 6 and the isolated power supply 7.
The cover 14 is provided with a bolt hole, a bolt 15 is connected to the bolt hole, a stop washer 16 is arranged on the cover 14, and the cover 14 is fixed on the fixed box 5 through the bolt 15 and the stop washer 16.
The isolated power supply 7 is used for outputting voltage and current to supply power to the demodulator 6 with the transmitter 10.
The demodulator 6 is configured to decode the output signal of the thermometric optical fiber 2, and transmit the temperature signal of the rotor coil 8 obtained by decoding to the receiver 3 through the transmitter 10.
The hub 4 is configured to collect the temperature signal sent by the receiver 3 and send the temperature signal to the computer 1.
The computer 1 is used for recording real-time temperature of each group of coils of the generator rotor at any time on line, comparing the real-time temperature with preset normal temperature, and alarming after the real-time temperature exceeds the preset normal temperature.
The embodiment is an optimal implementation manner, and the computer 1 is used for online recording the real-time temperature of each group of coils of the generator rotor at any time, comparing the real-time temperature with the preset normal temperature, and alarming after the real-time temperature exceeds the preset normal temperature, so that the running stability of the whole unit can be effectively ensured.
The working principle of the invention is as follows:
when the unit operates, exciting current is conducted in a rotor lead 9, an isolation power supply 7 and rotor magnetic poles are connected in parallel, the isolation power supply 7 outputs proper voltage and current to the demodulator 6 with a transmitter 10 according to actual needs of the demodulator 6, a temperature measuring optical fiber 2 transmits a measured temperature signal of a rotor coil 8 of the generator to the demodulator 6 through a signal which can be identified by the optical fiber, the temperature signal is converted into a temperature signal through the demodulator 6 and then is sent to a receiver 3 on a stator through a transmitter 10 built in the demodulator 6, the receiver 3 transmits the temperature signal to a hub 4 through a communication cable, the hub 4 transmits the collected temperature signal to a computer 1 through the communication cable, and the computer 1 directly reads the temperature of the rotor coil 8, so that online temperature real-time monitoring of the rotor coil 8 with high rotation speed is realized.
When the distance between the computer 1 and the hub 4 is up to 1000 m or more, the hub 4 transmits the collected temperature signals to the sending data optical terminal 19 through the communication cable, the sending data optical terminal 19 transmits the collected temperature signals to the receiving data optical terminal 20 through the optical cable, the receiving data optical terminal 20 transmits the data to the Ethernet switch 17 through the optical cable, the Ethernet switch 17 transmits the data to the upper computer server 18 through the communication cable to store the data, and the upper computer server 18 is connected to the computer 1 through the communication cable to read the temperature when the rotor coil 8 operates. If the temperature of the rotor coil 8 is too high, exceeding a prescribed preset value, an alarm is immediately given.
Claims (7)
1. The utility model provides a rotor coil temperature measuring device, includes computer (1) and sets up temperature measurement optic fibre (2) on the rotor, its characterized in that: the system further comprises an Ethernet switch (17), an upper computer server (18), an optical terminal (19) for sending data, an optical terminal (20) for receiving data, a receiver (3) and a hub (4) which are fixed on a stator, a fixed box (5) which is fixed on a rotor support, a demodulator (6) and an isolated power supply (7) which are arranged in the fixed box (5), wherein the rotor comprises a rotor coil (8) and a rotor lead (9) which is connected with the rotor coil (8), the isolated power supply (7) is respectively connected with the demodulator (6) and the rotor lead (9) through a power cable, a transmitter (10) is arranged in the demodulator (6), the temperature measuring optical fiber (2) is connected with the demodulator (6), the receiver (3) is connected with the hub (4) through a communication cable, the receiving end of the optical terminal (19) is connected with the computer (1) through the communication cable, the transmitting end of the optical terminal (19) is connected with the receiving end of the optical terminal (20) through the optical cable, and the transmitting end of the optical terminal (19) is connected with the Ethernet switch (17) through the Ethernet switch (17);
the number of the receivers (3) is plural, and the plurality of the receivers (3) are uniformly arranged along the circumferential direction of the stator;
the temperature measuring optical fiber (2) comprises a temperature measuring probe (11) and a temperature measuring lead (12) connected to the temperature measuring probe (11), a chute (13) is formed in a copper bar of the rotor coil (8), the temperature measuring probe (11) is embedded into the chute (13), heat-resistant sealant is arranged in the chute (13), and the temperature measuring probe (11) is sealed through the heat-resistant sealant.
2. A rotor coil temperature measuring device according to claim 1, wherein: the fixed box (5) is provided with a cover (14) for packaging the demodulator (6) and isolating the power supply (7).
3. A rotor coil temperature measuring device according to claim 2, wherein: the cover (14) is provided with a bolt hole, the bolt hole is connected with a bolt (15), the cover (14) is provided with a stop washer (16), and the cover (14) is fixed on the fixed box (5) through the bolt (15) and the stop washer (16).
4. A rotor coil temperature measuring device according to claim 1, wherein: the isolation power supply (7) is used for outputting voltage and current to supply power to the demodulator (6) with the transmitter (10).
5. A rotor coil temperature measuring device according to claim 1, wherein: the demodulator (6) is used for decoding the output signal of the temperature measuring optical fiber (2) and transmitting the temperature signal of the rotor coil (8) obtained by decoding to the receiver (3) through the transmitter (10).
6. A rotor coil temperature measuring device according to claim 1, wherein: the hub (4) is used for collecting the temperature signals sent by the receiver (3) and sending the temperature signals to the computer (1).
7. A rotor coil temperature measuring device according to claim 1, wherein: the computer (1) is used for recording real-time temperature of each group of coils of the generator rotor at any time on line, comparing the real-time temperature with preset normal temperature, and alarming after the real-time temperature exceeds the preset normal temperature.
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| CN202210458942.9A CN114884280B (en) | 2022-04-28 | 2022-04-28 | Rotor coil temperature measuring device |
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| CN202210458942.9A CN114884280B (en) | 2022-04-28 | 2022-04-28 | Rotor coil temperature measuring device |
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