CN113916392A - Hydropower station generator rotor winding temperature on-line monitoring system and method - Google Patents
Hydropower station generator rotor winding temperature on-line monitoring system and method Download PDFInfo
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- CN113916392A CN113916392A CN202111183357.4A CN202111183357A CN113916392A CN 113916392 A CN113916392 A CN 113916392A CN 202111183357 A CN202111183357 A CN 202111183357A CN 113916392 A CN113916392 A CN 113916392A
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- 238000009529 body temperature measurement Methods 0.000 claims abstract description 88
- 238000006243 chemical reaction Methods 0.000 claims abstract description 66
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- 238000009413 insulation Methods 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 230000005426 magnetic field effect Effects 0.000 description 1
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- G—PHYSICS
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
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Abstract
The invention discloses a hydropower station generator rotor winding temperature on-line monitoring system and a method, wherein the system comprises an RFID passive temperature measurement tag, an RFID signal transmitting antenna, an RFID signal receiving antenna, a photoelectric conversion switch, a data conversion module and an upper computer; the RFID passive temperature measurement tag is arranged at the convex magnetic pole of the generator rotor; the RFID signal transmitting antenna and the RFID signal receiving antenna are arranged outside the generator rotor side by side; the upper computer, the data conversion module and the photoelectric conversion switch are sequentially connected, and the photoelectric conversion switch is further connected with the RFID signal transmitting antenna and the RFID signal receiving antenna. The temperature change of the generator rotor of the hydropower station can be directly monitored on line, a data basis is provided for follow-up judgment of possible faults of the generator rotor winding, fault early warning and early maintenance, and a reliable monitoring means is provided for safe operation of the generator of the hydropower station.
Description
Technical Field
The invention relates to the technical field of generating motors, in particular to a system and a method for monitoring the temperature of a rotor winding of a generator of a hydropower station on line.
Background
For a hydroelectric generator rotor, the rotor windings can be subjected to the action of alternating electromagnetic force during normal operation and the large temperature rise and overheating effects generated during sudden short circuit. The insulation of the rotor winding of the generator is reduced and even damaged due to the excessive temperature for a long time, and the interphase short circuit accident is caused by serious faults. The general electrical monitoring and the external component temperature monitoring do not reflect the dangerous temperature change, and the occurrence of sudden accidents is difficult to avoid. The abnormal change of the rotor winding can be predicted in time through the change of the temperature parameter of the generator rotor winding, early warning and early processing are achieved, and the occurrence of serious accidents is avoided. Therefore, it is necessary to directly monitor the temperature of the rotor winding.
Disclosure of Invention
The invention provides a hydropower station generator rotor winding temperature on-line monitoring system and a hydropower station generator rotor winding temperature on-line monitoring method, which are used for solving the problem that the temperature of a hydropower station generator rotor winding cannot be directly monitored at present.
The first aspect provides a hydropower station generator rotor winding temperature online monitoring system, which comprises an RFID passive temperature measurement tag, an RFID signal transmitting antenna, an RFID signal receiving antenna, a photoelectric conversion switch, a data conversion module and an upper computer;
the RFID passive temperature measurement tag is arranged at the convex magnetic pole of the generator rotor; the RFID signal transmitting antenna and the RFID signal receiving antenna are arranged outside the generator rotor side by side; the upper computer, the data conversion module and the photoelectric conversion switch are sequentially connected, and the photoelectric conversion switch is further connected with the RFID signal transmitting antenna and the RFID signal receiving antenna.
Furthermore, the RFID signal transmitting antenna is used for transmitting a temperature measuring signal to the RFID passive temperature measuring tag, and the RFID signal receiving antenna is used for receiving the temperature signal transmitted by the RFID passive temperature measuring tag; the photoelectric conversion switch is used for controlling the connection between the data conversion module and the RFID signal transmitting antenna and the RFID signal receiving antenna; the data conversion module is used for transmitting a temperature measurement signal sent by the upper computer to the RFID signal transmitting antenna and is also used for transmitting a temperature signal received by the RFID signal receiving antenna to the upper computer for monitoring and displaying.
And furthermore, the system comprises a plurality of RFID passive temperature measurement tags which are respectively arranged at the convex magnetic poles of the rotor of the generator of the hydropower station.
Further, the distance L between the RFID signal transmitting antenna and the RFID signal receiving antenna is:
L＝2Rsin(πrt)
r is the axial center distance between the RFID signal transmitting antenna, the RFID signal receiving antenna and the generator rotor, R is the rotating speed of the generator rotor, and t is the time interval from the time when the RFID passive temperature measurement tag receives the temperature measurement signal to the time when the RFID passive temperature measurement tag sends the temperature signal.
Further, a photoelectric sensing probe of the photoelectric conversion switch is mounted on one side of the RFID signal transmitting antenna far away from the RFID signal receiving antenna; when the photoelectric sensing probe is triggered by the RFID passive temperature measurement tag approaching to the photoelectric sensing probe, the photoelectric conversion switch is connected and conducted with the RFID signal transmitting antenna and disconnected with the RFID signal receiving antenna, and after the preset delay, the photoelectric conversion switch is connected and conducted with the RFID signal receiving antenna and disconnected with the RFID signal transmitting antenna, and the preset delay is smaller than the time interval from the time when the RFID passive temperature measurement tag receives the temperature measurement signal to the time when the RFID passive temperature measurement tag sends the temperature signal.
Further, the data conversion module comprises a reader, a micro-processing unit and an edge calculation unit which are sequentially connected, the reader is also connected with the photoelectric conversion switch, and the edge calculation unit is connected with the upper computer.
Furthermore, the micro-processing unit is connected with the reader through an RS232/485 serial communication line, the edge calculation unit is connected with the micro-processing unit through an RS232/485 serial communication line, and the upper computer is connected with the edge calculation unit through an Ethernet.
In a second aspect, a method for online monitoring of the temperature of a rotor winding of a generator of a hydropower station is provided, which comprises the following steps:
installing an RFID passive temperature measurement tag at a convex magnetic pole of a generator rotor;
sending a temperature measurement signal to the RFID passive temperature measurement tag through an RFID signal transmitting antenna arranged outside the generator rotor; the RFID passive temperature measurement tag sends a temperature signal after receiving the temperature measurement signal;
and the RFID signal receiving antenna which is arranged outside the generator rotor side by side with the RFID signal transmitting antenna receives the temperature signal and transmits the temperature signal to the upper computer.
Further, the distance L between the RFID signal transmitting antenna and the RFID signal receiving antenna is:
L＝2Rsin(πrt)
r is the distance between the RFID signal transmitting antenna and the axis of the generator rotor, R is the rotating speed of the generator rotor, and t is the time interval from the time when the RFID passive temperature measurement tag receives the temperature measurement signal to the time when the RFID passive temperature measurement tag sends the temperature signal.
Furthermore, the RFID signal transmitting antenna and the RFID signal receiving antenna are both connected with an upper computer through a photoelectric conversion switch and a data conversion module which are connected in sequence; a photoelectric sensing probe of the photoelectric conversion switch is arranged on one side of the RFID signal transmitting antenna far away from the RFID signal receiving antenna; when the photoelectric sensing probe is triggered by the adjacent RFID passive temperature measurement label, the photoelectric conversion switch is connected and conducted with the RFID signal transmitting antenna and disconnected with the RFID signal receiving antenna, after the preset delay, the photoelectric conversion switch is connected and conducted with the RFID signal receiving antenna and disconnected with the RFID signal transmitting antenna, and the preset delay is smaller than the time interval from the time when the RFID passive temperature measurement label receives the temperature measurement signal to the time when the RFID passive temperature measurement label sends the temperature signal.
Advantageous effects
The invention provides a hydropower station generator rotor winding temperature online monitoring system and a method, the scheme is simple, the temperature change of a hydropower station generator rotor can be directly monitored online, a data basis is provided for the follow-up judgment of possible faults of the generator rotor winding, the early warning of the faults and the early maintenance and repair, and a reliable monitoring means is provided for the safe operation of a hydropower station generator.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an on-line monitoring system for the temperature of a rotor winding of a generator of a hydropower station according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a distance between an RFID signal transmitting antenna and an RFID signal receiving antenna according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an operation of a photoelectric conversion switch according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an online temperature monitoring system for a generator rotor winding of a hydropower station, including an RFID passive temperature measurement tag 3, an RFID signal transmitting antenna 4, an RFID signal receiving antenna 5, a photoelectric conversion switch 6, a data conversion module, and an upper computer 10;
the RFID passive temperature measurement tag 3 is arranged at the salient magnetic pole 2 of the generator rotor 1; the RFID signal transmitting antenna 4 and the RFID signal receiving antenna 5 are arranged outside the generator rotor 1 side by side; the upper computer 10, the data conversion module and the photoelectric conversion switch 6 are sequentially connected, and the photoelectric conversion switch 6 is further connected with the RFID signal transmitting antenna 4 and the RFID signal receiving antenna 5.
The RFID signal transmitting antenna 4 is used for sending a temperature measuring signal to the RFID passive temperature measuring tag 3; the RFID passive temperature measurement tag 3 is used for detecting the temperature of the generator rotor winding and sending a temperature signal containing a detection result after receiving a temperature measurement signal, and because of the magnetic field effect, the temperature at the salient magnetic pole is generally the highest, so that the RFID passive temperature measurement tag 3 is arranged at the salient magnetic pole, and the detected temperature is the highest temperature of the rotor winding; the RFID signal receiving antenna 5 is used for receiving the temperature signal sent by the RFID passive temperature measurement tag 3; the photoelectric conversion switch 6 is used for controlling the connection between the data conversion module and the RFID signal transmitting antenna 4 and the RFID signal receiving antenna 5; the data conversion module is used for transmitting a temperature measurement signal sent by the upper computer 10 to the RFID signal transmitting antenna 4 and transmitting a temperature signal received by the RFID signal receiving antenna 5 to the upper computer 10 for monitoring and displaying.
As shown in fig. 2, in this embodiment, the distance L between the RFID signal transmitting antenna 4 and the RFID signal receiving antenna 5 is:
L＝2Rsin(πrt)
r is the axial distance between the RFID signal transmitting antenna 4, the RFID signal receiving antenna 5 and the generator rotor 1, R is the rotating speed of the generator rotor 1, and t is the time interval from the time when the RFID passive temperature measurement tag 3 receives the temperature measurement signal to the time when the RFID passive temperature measurement tag sends the temperature signal. In the specific implementation process, the unit of R is m, the rotation speed of the generator rotor 1 is R revolutions/min, and the time interval t is s, so the formula of the distance L can be rewritten as follows: l ═ 2Rsin (rr/60) (m).
As shown in fig. 3, the photoelectric sensing probe 61 of the photoelectric conversion switch 6 is mounted on a side of the RFID signal transmitting antenna 4 away from the RFID signal receiving antenna 5. When the current RFID passive temperature measurement tag 3 is close to the photoelectric sensing probe 61 and triggers the photoelectric sensing probe 61, the photoelectric conversion switch 6 is connected and conducted with the RFID signal transmitting antenna 4 and disconnected with the RFID signal receiving antenna 5, and the RFID signal transmitting antenna 4 sends a temperature measurement signal to the current RFID passive temperature measurement tag 3; after a preset time delay delta t (delta t is less than t), the photoelectric conversion switch 6 is connected and conducted with the RFID signal receiving antenna 5 and disconnected with the RFID signal transmitting antenna 4, and the RFID signal receiving antenna 5 receives a temperature signal sent by the current RFID passive temperature measurement tag 3.
In the embodiment, the temperature measurement device comprises a plurality of RFID passive temperature measurement tags 3, and the RFID passive temperature measurement tags 3 are respectively installed at the salient magnetic poles 2 of the generator rotor 1 of the hydropower station.
In this embodiment, the data conversion module includes a reader 7, a micro processing unit (MCU)8, and an edge calculation unit (PAC)9, which are connected in sequence, the reader 7 is further connected to the photoelectric conversion switch 6, and the edge calculation unit (PAC)9 is connected to the upper computer 10. Further, the micro processing unit (MCU)8 is connected to the reader 7 through an RS232/485 serial communication line, the edge calculation unit (PAC)9 is connected to the micro processing unit (MCU)8 through an RS232/485 serial communication line, and the upper computer 10 is connected to the edge calculation unit (PAC)9 through an ethernet. The reader 7 is used for processing the sent temperature measurement signal and the received temperature signal, the microprocessing unit (MCU)8 is used for carrying out preliminary digital processing on the temperature signal, and the edge calculation unit (PAC)9 is used for carrying out final digital processing on the temperature signal, because the related data is large, the digital processing process is realized through the cooperation of the microprocessing unit (MCU)8 and the edge calculation unit (PAC) 9.
The working process of the hydropower station generator rotor winding temperature on-line monitoring system provided by the embodiment is as follows:
the photoelectric conversion switch 6 detects whether the RFID passive temperature measurement tag 3 approaches, if so, the photoelectric conversion switch 6 is connected and conducted with the RFID signal transmitting antenna 4 and disconnected with the RFID signal receiving antenna 5, and at the moment, the upper computer 10 sends a temperature measurement signal to the RFID signal transmitting antenna 4 through the data conversion module and the photoelectric conversion switch 6, and then the RFID signal transmitting antenna 4 sends a temperature measurement signal to the RFID passive temperature measurement tag 3; the RFID passive temperature measurement tag 3 sends a temperature signal containing detected temperature information after receiving the temperature measurement signal; after a preset delay delta t (delta t is smaller than the time interval t from the time when the RFID passive temperature measurement tag receives the temperature measurement signal to the time when the RFID passive temperature measurement tag sends the temperature signal), the photoelectric conversion switch 6 is connected and conducted with the RFID signal receiving antenna 5 and disconnected with the RFID signal transmitting antenna 4, the RFID signal receiving antenna 5 receives the temperature signal sent by the RFID passive temperature measurement tag 3, and the temperature signal is converted into a digital signal through the data conversion module and then transmitted to the upper computer 10 for monitoring and displaying.
The embodiment of the invention also provides an online monitoring method for the temperature of the rotor winding of the generator of the hydropower station, which comprises the following steps:
installing an RFID passive temperature measurement tag at a convex magnetic pole of a generator rotor;
sending a temperature measurement signal to the RFID passive temperature measurement tag through an RFID signal transmitting antenna arranged outside the generator rotor; the RFID passive temperature measurement tag sends a temperature signal after receiving the temperature measurement signal;
and the RFID signal receiving antenna which is arranged outside the generator rotor side by side with the RFID signal transmitting antenna receives the temperature signal and transmits the temperature signal to the upper computer.
In this embodiment, the distance L between the RFID signal transmitting antenna and the RFID signal receiving antenna is:
L＝2Rsin(πrt)
r is the distance between the RFID signal transmitting antenna and the axis of the generator rotor, R is the rotating speed of the generator rotor, and t is the time interval from the time when the RFID passive temperature measurement tag receives the temperature measurement signal to the time when the RFID passive temperature measurement tag sends the temperature signal.
Specifically, the RFID signal transmitting antenna and the RFID signal receiving antenna are both connected with an upper computer through a photoelectric conversion switch and a data conversion module which are connected in sequence; a photoelectric sensing probe of the photoelectric conversion switch is arranged on one side of the RFID signal transmitting antenna far away from the RFID signal receiving antenna; when the photoelectric sensing probe is triggered by the adjacent RFID passive temperature measurement label, the photoelectric conversion switch is connected and conducted with the RFID signal transmitting antenna and disconnected with the RFID signal receiving antenna, after the preset delay, the photoelectric conversion switch is connected and conducted with the RFID signal receiving antenna and disconnected with the RFID signal transmitting antenna, and the preset delay is smaller than the time interval from the time when the RFID passive temperature measurement label receives the temperature measurement signal to the time when the RFID passive temperature measurement label sends the temperature signal.
In implementation, the method for monitoring the temperature of the rotor winding of the generator of the hydropower station on line provided by the embodiment can be realized based on the system for monitoring the temperature of the rotor winding of the generator of the hydropower station on line provided by the embodiment.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A hydropower station generator rotor winding temperature on-line monitoring system is characterized by comprising an RFID passive temperature measurement tag, an RFID signal transmitting antenna, an RFID signal receiving antenna, a photoelectric conversion switch, a data conversion module and an upper computer;
the RFID passive temperature measurement tag is arranged at the convex magnetic pole of the generator rotor; the RFID signal transmitting antenna and the RFID signal receiving antenna are arranged outside the generator rotor side by side; the upper computer, the data conversion module and the photoelectric conversion switch are sequentially connected, and the photoelectric conversion switch is further connected with the RFID signal transmitting antenna and the RFID signal receiving antenna.
2. The system for on-line monitoring of the temperature of the rotor winding of the generator of the hydropower station according to claim 1, wherein the RFID signal transmitting antenna is used for transmitting a temperature measuring signal to the RFID passive temperature measuring tag, and the RFID signal receiving antenna is used for receiving the temperature signal transmitted by the RFID passive temperature measuring tag; the photoelectric conversion switch is used for controlling the connection between the data conversion module and the RFID signal transmitting antenna and the RFID signal receiving antenna; the data conversion module is used for transmitting a temperature measurement signal sent by the upper computer to the RFID signal transmitting antenna and is also used for transmitting a temperature signal received by the RFID signal receiving antenna to the upper computer for monitoring and displaying.
3. The system for on-line monitoring of the winding temperature of the rotor of the hydropower station generator according to claim 1 or 2, comprising a plurality of RFID passive temperature measurement tags which are respectively installed at the convex magnetic poles of the rotor of the hydropower station generator.
4. The system according to claim 1 or 2, wherein the distance L between the RFID signal transmitting antenna and the RFID signal receiving antenna is:
L＝2Rsin(πrt)
r is the axial center distance between the RFID signal transmitting antenna, the RFID signal receiving antenna and the generator rotor, R is the rotating speed of the generator rotor, and t is the time interval from the time when the RFID passive temperature measurement tag receives the temperature measurement signal to the time when the RFID passive temperature measurement tag sends the temperature signal.
5. The system for on-line monitoring of the rotor winding temperature of the generator of the hydropower station according to claim 1 or 2, wherein the photoelectric sensing probe of the photoelectric conversion switch is installed on one side of the RFID signal transmitting antenna, which is far away from the RFID signal receiving antenna; when the photoelectric sensing probe is triggered by the RFID passive temperature measurement tag approaching to the photoelectric sensing probe, the photoelectric conversion switch is connected and conducted with the RFID signal transmitting antenna and disconnected with the RFID signal receiving antenna, and after the preset delay, the photoelectric conversion switch is connected and conducted with the RFID signal receiving antenna and disconnected with the RFID signal transmitting antenna, and the preset delay is smaller than the time interval from the time when the RFID passive temperature measurement tag receives the temperature measurement signal to the time when the RFID passive temperature measurement tag sends the temperature signal.
6. The system for monitoring the temperature of the rotor winding of the generator of the hydropower station according to claim 1 or 2, wherein the data conversion module comprises a reader, a micro-processing unit and an edge calculation unit which are sequentially connected, the reader is further connected with the photoelectric conversion switch, and the edge calculation unit is connected with the upper computer.
7. The system of claim 6, wherein the microprocessor unit is connected to the reader via an RS232/485 serial communication line, the edge computing unit is connected to the microprocessor unit via an RS232/485 serial communication line, and the upper computer is connected to the edge computing unit via an Ethernet.
8. A hydropower station generator rotor winding temperature online monitoring method is characterized by comprising the following steps:
installing an RFID passive temperature measurement tag at a convex magnetic pole of a generator rotor;
sending a temperature measurement signal to the RFID passive temperature measurement tag through an RFID signal transmitting antenna arranged outside the generator rotor;
the RFID passive temperature measurement tag sends a temperature signal after receiving the temperature measurement signal;
and the RFID signal receiving antenna which is arranged outside the generator rotor side by side with the RFID signal transmitting antenna receives the temperature signal and transmits the temperature signal to the upper computer.
9. The method of claim 8, wherein the distance L between the RFID signal transmitting antenna and the RFID signal receiving antenna is:
L＝2Rsin(πrt)
r is the distance between the RFID signal transmitting antenna and the axis of the generator rotor, R is the rotating speed of the generator rotor, and t is the time interval from the time when the RFID passive temperature measurement tag receives the temperature measurement signal to the time when the RFID passive temperature measurement tag sends the temperature signal.
10. The hydropower station generator rotor winding temperature online monitoring method according to claim 8 or 9, wherein the RFID signal transmitting antenna and the RFID signal receiving antenna are both connected with an upper computer through a photoelectric conversion switch and a data conversion module which are connected in sequence; a photoelectric sensing probe of the photoelectric conversion switch is arranged on one side of the RFID signal transmitting antenna far away from the RFID signal receiving antenna; when the photoelectric sensing probe is triggered by the adjacent RFID passive temperature measurement label, the photoelectric conversion switch is connected and conducted with the RFID signal transmitting antenna and disconnected with the RFID signal receiving antenna, after the preset delay, the photoelectric conversion switch is connected and conducted with the RFID signal receiving antenna and disconnected with the RFID signal transmitting antenna, and the preset delay is smaller than the time interval from the time when the RFID passive temperature measurement label receives the temperature measurement signal to the time when the RFID passive temperature measurement label sends the temperature signal.
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| CN202111183357.4A CN113916392B (en) | 2021-10-11 | 2021-10-11 | On-line monitoring system and method for temperature of rotor winding of hydropower station generator |
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| CN202111183357.4A CN113916392B (en) | 2021-10-11 | 2021-10-11 | On-line monitoring system and method for temperature of rotor winding of hydropower station generator |
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