A wireless passive temperature monitoring device and method for a hydro-generator rotor

Abstract

A wireless passive temperature monitoring device and method for a hydro-turbine generator rotor, comprising: a temperature sensor, a reader antenna, a power divider, a reader and a host computer system; wherein the temperature sensor is arranged on the magnetic pole lead-out line of the hydro-turbine generator rotor, the reader antenna is connected in parallel by a power divider, the reader antenna is connected to the reader, and the power divider and the reader are fixed on the stationary part of the hydro-turbine generator, and the host computer system sends a working instruction to the reader. The present invention provides an easy-to-set-up monitoring device, which ensures that the temperature value of the high-speed rotating temperature sensor is stably read within the single communication time of the reader by expanding the circumferential coverage of the reader antenna signal, realizes passive wireless monitoring of the temperature of the hydro-turbine generator rotor, provides data support for the monitoring system of the hydropower station, improves the stability of the hydro-turbine generator rotor system, reduces the inspection and maintenance frequency of the power plant, and ensures the safe and stable operation of the unit.

Description

Technical Field

[0001] This major relates to the field of hydro-generator status monitoring, and in particular to a wireless passive temperature monitoring device and method for a hydro-generator rotor. Background Art

[0002] The rotor poles of the hydro-turbine generator will have abnormal temperature rise during operation due to vibration, electromagnetic loss, installation and other reasons. The closed environment and long maintenance cycle during the production process bring hidden dangers to production safety. If the abnormal temperature rise of the poles cannot be discovered in time, it is very easy to cause safety accidents such as short circuit, fire, equipment shutdown, and even casualties, resulting in huge direct or indirect economic losses.

[0003] There are two traditional temperature measurement methods for the rotor poles of hydro-turbine generators: indirect measurement and infrared temperature measurement.

[0004] Among them, the indirect measurement method, that is, using the relationship between resistance and temperature, resistance and voltage, and current, measures other parameters and calculates the temperature of the connecting wire through a series of formulas. This method has the problem of low accuracy due to the existence of contact resistance.

[0005] Infrared temperature measurement technology is to install an infrared probe on the stator. The infrared scanner cannot perform infrared imaging and can only scan a surface or a point. When the turbine generator rotor rotates at high speed, the infrared scanner can only capture one temperature measurement point on each magnetic pole. This method is difficult to effectively capture abnormal hot spots on the magnetic pole. Therefore, the temperature measurement value has little reference value, and it is impossible to carry out targeted monitoring of the magnetic pole coil, magnetic pole core, and inter-pole connecting wire. Summary of the invention

[0006] In order to solve the deficiencies in the prior art, the present invention provides a wireless passive temperature monitoring device for a hydro-generator rotor, which solves the technical problems of low measurement accuracy and low measurement stability in the existing hydro-generator rotor temperature measurement method.

[0007] The present invention adopts the following technical solution.

[0008] A wireless passive temperature monitoring device for a hydro-generator rotor, comprising: a temperature sensor, a reader antenna, a power divider, a reader and a host computer system;

[0009] Among them, the temperature sensor is set on the magnetic pole lead-out line of the hydro-turbine generator rotor, the reader antenna is connected in parallel with a power divider, the reader antenna is connected to the reader, and the power divider and reader are fixed on the stationary parts of the hydro-turbine generator. The host computer system sends working instructions to the reader.

[0010] Preferably, the temperature measurement sensor adopts an RFID passive wireless temperature measurement chip.

[0011] Preferably, the temperature sensor is packaged in a PCB, including a bolt-fitting area and an effective sensor area; and the bolt-fitting area matches the structure of the magnetic pole lead-out wire.

[0012] Preferably, the reader antenna adopts a flat-panel antenna structure, fixed to the upper windshield of the hydro-turbine generator or hoisted on the upper frame of the hydro-turbine generator, and the fixed position of the reader antenna satisfies that the temperature sensor can pass through the signal coverage range of the reader antenna during the rotation of the generator rotor.

[0013] Preferably, the reader antennas connected in parallel are completely identical and are arranged in a fan-shaped manner by splicing, and the number M of the reader antennas satisfies:

[0014] M≥≥K*V*T / L

[0015] Among them, V is the linear speed of the generator rotor; T is the single sampling communication cycle of the reader; L is the length of the reader antenna, referring to the arc length of the windshield; K is the margin coefficient, and the value of K is greater than 1.2.

[0016] Preferably, the device further comprises a radio frequency cable, through which the parallel reader antennas are connected to the reader, the radio frequency cable is fixed on the upper rack bridge, and the length of the radio frequency cable is within 10m.

[0017] Preferably, the power divider and the reader are packaged together and fixed on the upper frame of the hydro-generator close to the wind tunnel.

[0018] Preferably, the host computer system sends a start or stop instruction to the reader through network communication, and obtains the temperature value of the magnetic pole in real time.

[0019] The present invention also provides a wireless passive temperature monitoring method for a hydro-generator rotor, comprising the following steps:

[0020] Step 1: During the operation of the hydro-generator unit, the host computer system sends a command to start the reader;

[0021] Step 2: When the temperature sensor rotates with the rotor of the hydro-generator to within the coverage of the reader antenna, the electromagnetic waves continuously emitted by the reader antenna activate the temperature sensor;

[0022] Step 3: The temperature sensor completes temperature collection within the activation period, and modulates the tag information of the temperature sensor and the collected temperature signal into a radio frequency signal and returns it to the reader antenna;

[0023] Step 4: The reader demodulates the radio frequency signal received by the reader antenna, and sends the tag information and temperature signal to the host computer system via network communication, completing a magnetic pole temperature collection process.

[0024] The present invention also provides a terminal, including a processor and a storage medium;

[0025] The storage medium is used to store instructions;

[0026] The processor is used to operate according to the instructions to execute the steps of the wireless passive temperature monitoring method for a hydro-turbine generator rotor.

[0027] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the wireless passive temperature monitoring method for a hydro-generator rotor are implemented.

[0028] The beneficial effect of the present invention is that, compared with the prior art, the wireless passive temperature monitoring device for the rotor of the hydro-turbine generator proposed by the present invention, by installing the temperature sensor on the magnetic pole lead-out line, adopts a power divider to expand the circumferential coverage of the reader antenna signal, ensures that the temperature value of the high-speed rotating temperature sensor is stably read within the single communication time of the reader, realizes the passive wireless monitoring of the rotor temperature of the hydro-turbine generator, fills the deficiency of the traditional temperature measurement method of the rotor temperature of the hydro-turbine generator, provides data support for the monitoring system of the hydropower station, improves the stability of the rotor system of the hydro-turbine generator, reduces the inspection and maintenance frequency of the power plant, and ensures the safe and stable operation of the unit. The present invention includes at least the following beneficial effects:

[0029] 1. The present invention realizes direct measurement of the rotor pole temperature of the hydro-generator in a passive wireless manner;

[0030] 2. The temperature sensor has a simple structure, is easy to arrange, has high safety, and does not affect the original generator set structure;

[0031] 3. The power divider is used to effectively solve the circumferential coverage problem of the reader antenna signal, so that this technology can be applied to the field of turbine generator rotor temperature monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a system topology diagram of the wireless passive temperature monitoring device of the hydro-generator rotor in the present invention;

[0033] Figure 2 It is a structural schematic diagram of the temperature measuring sensor in the present invention;

[0034] Figure 3 It is a connection diagram of multiple reader antennas in the present invention;

[0035] Figure 4 It is a structural schematic diagram of a wireless passive temperature monitoring device for a hydro-generator rotor in the present invention;

[0036] Figure 5 It is a flow chart of the wireless passive temperature monitoring method of the hydro-generator rotor in the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0038] like Figure 1 , 4 As shown, the present invention proposes a wireless passive temperature monitoring device for a hydro-generator rotor, the device comprising a temperature sensor 1, a reader antenna 2, a power divider 4, a reader 5 and a host computer system 8;

[0039] Among them, the temperature sensor 1 is arranged on the magnetic pole lead-out line of the rotor of the hydro-generator to be monitored, a power divider 4 is used to set multiple reader antennas 2 in parallel, the reader antenna 2 is connected to the reader 5, the power divider 4 and the reader 5 are fixedly arranged on the stationary parts of the hydro-generator to be monitored, and the host computer system 8 sends a working instruction to the reader 5.

[0040] Preferably, the temperature sensor 1 used in the present invention adopts an RFID passive wireless temperature measurement chip, and a temperature sensor 1 is arranged on each magnetic pole of the hydro-generator to be monitored.

[0041] Further, such as Figure 2 As shown, the temperature sensor 1 used is packaged in a PCB, including a bolt-fitting area and an effective sensor area, and the two areas are independently arranged; wherein, the bolt-fitting area can be matched with the structure of the magnetic pole lead wire 7, for example, the magnetic pole lead wire 7 adopts a double row of bolt holes, and the bolt-fitting holes can be round holes or waist-shaped holes.

[0042] The reader antenna 2 adopts a flat-panel antenna structure and is fixed on the upper windshield 6 of the hydro-turbine generator to be monitored or hoisted on the upper frame 9 of the hydro-turbine generator; further, the temperature sensor 1 moves with the rotation of the generator rotor, and the fixed position of the reader antenna 2 satisfies that the temperature sensor 1 can pass through the signal coverage range of the reader antenna 2 during the rotation of the generator rotor.

[0043] Further, such as Figure 3 As shown, in the present invention, the structures of the reader antennas 2 connected in parallel through the power divider 4 are completely the same, and are arranged in a fan-shaped manner by splicing. The number M of the reader antennas 2 provided satisfies:

[0044] M≥K*V*T / L

[0045] Wherein, V is the linear speed of the generator rotor; T is the single sampling communication period of the reader 5; L is the length of the reader antenna 2, referring to the arc length of the windshield; K is the margin coefficient, and the value of K is greater than 1.2.

[0046] In the present invention, the value of K is preferably 1.5.

[0047] Furthermore, the wireless passive temperature monitoring device for a hydro-generator rotor proposed in the present invention also includes a radio frequency cable 3, through which each of the parallel reader antennas 2 is connected to the reader 5, and the radio frequency cable 3 is fixed on the bridge of the upper frame 9, and the length of the radio frequency cable 3 is within 10m.

[0048] Preferably, the power divider 4 and the reader 5 are packaged together and fixed to the upper frame 9 of the hydro-generator to be monitored near the wind tunnel.

[0049] Furthermore, the host computer system 8 sends a start or stop instruction to the reader 5 through network communication, and obtains the temperature value of the magnetic pole in real time.

[0050] like Figure 5 As shown, the present invention also proposes a wireless passive temperature monitoring method for a hydro-generator rotor. The wireless passive temperature monitoring device for a hydro-generator rotor implements temperature monitoring of the hydro-generator rotor based on the method. The method specifically comprises the following steps:

[0051] Step 1: During the operation of the hydro-generator unit, the host computer system 8 sends an instruction to start the reader 5;

[0052] Step 2: When the temperature sensor 1 rotates with the rotor of the hydro-generator into the coverage of the reader antenna 2, the electromagnetic waves continuously emitted by the reader antenna 2 activate the temperature sensor 1;

[0053] Among them, since the temperature sensor 1 is fixed on the magnetic pole lead-out wire, and the magnetic pole rotates with the circumference of the rotor of the hydro-generator, the temperature sensor 1 will also rotate with the rotation of the rotor.

[0054] Step 3, the temperature sensor 1 completes the temperature collection within the activation time period, modulates the tag information of the temperature sensor 1 and the measured temperature signal into a radio frequency signal and returns it to the reader antenna 2;

[0055] The tag information of the temperature sensor 1 is the ID number of the RFID tag, which is used to identify the temperature sensor 1 corresponding to the temperature signal and the magnetic pole it monitors;

[0056] In step 4, the reader 5 demodulates the radio frequency signal received by the reader antenna 2, and sends the tag information and temperature signal to the host computer system 8 via network communication, completing a magnetic pole temperature collection process. The host computer system 8 counts and displays the temperature information of each magnetic pole.

[0057] Preferably, since a temperature sensor 1 is arranged for each magnetic pole in the present invention, the host computer system 8 can continuously obtain the temperature information of each magnetic pole and display the temperature corresponding to each magnetic pole.

[0058] The beneficial effect of the present invention is that, compared with the prior art, the present invention realizes direct measurement of the rotor pole temperature of the hydro-generator, and the monitoring device is easy to arrange, has high safety, and has a wider monitoring range.

[0059] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0060] Computer readable storage medium can be a tangible device that can hold and store instructions used by an instruction execution device. Computer readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (non-exhaustive lists) of computer readable storage medium include: portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), static random access memories (SRAM), portable compact disk read-only memories (CD-ROM), digital versatile disks (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or convex structures in grooves on which instructions are stored, and any suitable combination thereof. Computer readable storage medium used here is not interpreted as a transient signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagated by waveguides or other transmission media (e.g., light pulses by optical fiber cables), or electrical signals transmitted by wires.

[0061] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0062] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages-such as Smalltalk, C++, etc., and conventional procedural programming languages-such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network-including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA) may be personalized by utilizing the state information of a computer-readable program instruction, and the electronic circuit may execute a computer-readable program instruction, thereby realizing various aspects of the present disclosure.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A wireless passive temperature monitoring device for a hydro-generator rotor, characterized in that: include: Temperature sensor (1), reader antenna (2), power divider (4), reader (5) and host computer system (8); The temperature sensor (1) is arranged on the magnetic pole lead-out line of the turbine generator rotor, a power divider (4) is used to connect the reader antenna (2) in parallel, the reader antenna (2) is connected to the reader (5), and the power divider (4) and the reader (5) are fixed on the stationary part of the turbine generator, and the upper computer system (8) sends a working instruction to the reader (5); The reader antenna (2) adopts a flat-plate antenna structure and is fixed to an upper windshield (6) of the hydro-generator or hoisted on an upper frame (9) of the hydro-generator. The fixed position of the reader antenna (2) satisfies the requirement that the temperature sensor (1) can pass through a signal coverage range of the reader antenna (2) during the rotation of the generator rotor. The parallel-connected reader antennas (2) are completely identical and are arranged in a fan-shaped manner by splicing. The number M of the reader antennas (2) satisfies: M≥K*V*T / L Wherein, V is the linear speed of the generator rotor; T is the single sampling communication cycle of the reader (5); L is the length of the reader antenna (2), referring to the arc length of the windshield; K is the margin coefficient, and the value of K is greater than 1.2; The power divider (4) and the reader (5) are packaged together and fixed on an upper frame (9) of the hydro-generator near a wind tunnel.

2. The wireless passive temperature monitoring device for a hydro-generator rotor according to claim 1, characterized in that: The temperature measuring sensor (1) adopts an RFID passive wireless temperature measuring chip.

3. The wireless passive temperature monitoring device for a hydro-generator rotor according to claim 1, characterized in that: The temperature measuring sensor (1) is packaged in a PCB and comprises a bolt engaging area and an effective sensor area; and the bolt engaging area matches the structure of the magnetic pole lead wire (7).

4. The wireless passive temperature monitoring device for a hydro-generator rotor according to claim 1, characterized in that: The device also includes a radio frequency cable (3), through which the parallel reader antennas (2) are connected to the reader (5), the extension route is fixed on the bridge frame of the upper frame (9), and the length of the radio frequency cable (3) is within 10m.

5. The wireless passive temperature monitoring device for a hydro-generator rotor according to claim 1, characterized in that: The upper computer system (8) sends a start or stop instruction to the reader (5) through network communication, and obtains the temperature value of the magnetic pole in real time.

6. A wireless passive temperature monitoring method for a hydro-generator rotor based on the wireless passive temperature monitoring device according to any one of claims 1 to 5, characterized in that: Step 1: During the operation of the hydro-generator unit, the host computer system (8) sends a command to start the reader (5); Step 2, when the temperature sensor (1) rotates with the rotor of the hydro-generator to within the coverage of the reader antenna (2), the electromagnetic waves continuously emitted by the reader antenna (2) activate the temperature sensor (1); Step 3, the temperature sensor (1) completes temperature collection within the activation time period, and modulates the tag information of the temperature sensor (1) and the collected temperature signal into a radio frequency signal and returns it to the reader antenna (2); In step 4, the reader (5) demodulates the radio frequency signal received by the reader antenna (2), and sends the tag information and the temperature signal to the host computer system (8) via network communication, thereby completing a magnetic pole temperature collection process. The host computer system (8) counts and displays the temperature information of each magnetic pole.

7. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to claim 6.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to claim 6 are implemented.

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