Ultrahigh frequency passive wireless temperature measurement and partial discharge monitoring fusion device

Abstract

The invention discloses an ultrahigh frequency passive wireless temperature measurement and partial discharge monitoring fusion device, which belongs to the technical field of power equipment monitoring, and comprises a radio frequency antenna, a directional coupler, a radio frequency temperature measurement module, a partial discharge module and a processing module, the straight-through end and the coupling end of the directional coupler are respectively connected with the radio frequency temperature measurement module and the partial discharge module; the radio frequency temperature measurement module and the partial discharge module are connected with the processing module. The integrated radio frequency temperature measurement module and the partial discharge module are arranged in the same device, ultrahigh frequency passive wireless temperature measurement and partial discharge monitoring can be carried out on power equipment at the same time, faults can be found and early warned in time, the deployment and installation cost is reduced, and the construction and debugging efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment monitoring, and in particular to a fusion device of ultra-high frequency passive wireless temperature measurement and partial discharge monitoring. Background Art

[0002] Power equipment usually needs to detect temperature and partial discharge (PD). Traditional temperature monitoring devices and PD monitoring devices can only collect and process the temperature of electrical equipment or the acoustic wave signals generated by partial discharge. The state perception of the monitored object is not comprehensive enough, and more monitoring sensors need to be installed in the power equipment, which is not convenient for on-site construction and debugging. This leads to high deployment costs of monitoring devices, high manual installation costs, and low construction and debugging efficiency.

[0003] Take the switch cabinet of the power system as an example. The switch cabinet has a small internal space, many parts, complex structure, small insulation distance, and defects such as bubble gaps, impurities, spikes, etc. in the insulation. Under the action of a strong electric field, the electric field distribution inside the switch cabinet insulation is uneven, and the electric field strength at the defective part will increase, which can easily lead to discharge that does not penetrate the entire insulation at that part, that is, partial discharge. If it exists for a long time, it will cause the destruction of the electric field strength of the insulation device under certain conditions, and eventually cause insulation breakdown inside the switch cabinet. At the same time, each line node in the power system has a temperature rise hazard, and more than 80% of accidents have abnormal temperature rise before they occur. The high voltage and strong magnetic field background of the node during operation put forward high requirements on the passivity and reliability of the monitoring equipment. Therefore, partial discharge monitoring and real-time temperature monitoring of the switch cabinet are important means to evaluate the working condition of the switch cabinet, and are also one of the effective measures to discover latent equipment faults, realize fault warning, and avoid faults.

[0004] Therefore, it is necessary to design a fusion device that can perform partial discharge monitoring and temperature monitoring at the same time. Summary of the invention

[0005] In view of the above-mentioned technical problems existing in the prior art, the present invention provides a fusion device of ultra-high frequency passive wireless temperature measurement and partial discharge monitoring, which integrates a radio frequency temperature measurement module and a partial discharge module, and can perform partial discharge monitoring and temperature monitoring at the same time.

[0006] The present invention discloses a fusion device of ultra-high frequency passive wireless temperature measurement and partial discharge monitoring, comprising a radio frequency antenna, a directional coupler, a radio frequency temperature measurement module, a partial discharge module and a processing module, wherein the radio frequency antenna is connected to the directional coupler, and the through end and the coupling end of the directional coupler are respectively connected to the radio frequency temperature measurement module and the partial discharge module; the radio frequency temperature measurement module and the partial discharge module are connected to the processing module.

[0007] Preferably, it further comprises a multi-way radio frequency switch and a plurality of ports, wherein one end of the multi-way radio frequency switch is connected to one or more radio frequency antennas through the port, and the other end is connected to the directional coupler.

[0008] Preferably, 300MHz-3GHz, the RFID frequency band is 902MHz-928MHz, the standing wave of the whole frequency band is less than 1.7, the gain of the whole frequency band reaches 3dBi, and the gain of the whole frequency band reaches 5dBi;

[0009] The radio frequency antenna is a microstrip directional antenna with a gain of dBi in the RFID frequency band;

[0010] The size of the radio frequency antenna is 150*150mm, and the low profile thickness is 10mm.

[0011] Preferably, it further comprises a communication unit, and the communication unit is connected to the processing module.

[0012] Preferably, the partial discharge module is used to convert the received electromagnetic wave signal into a digital signal for analysis, and the strength of the digital signal obtained by the analysis is the magnitude of the electromagnetic field signal generated by the partial discharge;

[0013] The radio frequency temperature measurement module is used to receive and analyze RFID tag data based on the 18000-6C protocol to obtain temperature information in the RFID tag;

[0014] The processing module includes an MCU control unit for storing, filtering and sending data;

[0015] The communication unit is used to upload data to the host computer based on RS-485 and Lora.

[0016] Preferably, the acquisition frequency band of the partial discharge module is 300MHz-3GHz, and the monitoring dynamic range is -70 to 10dB;

[0017] The temperature measurement range of the radio frequency temperature measurement module is -40 to 150°C, with an error of ±1°C.

[0018] Preferably, the processing unit stores the partial discharge data and the temperature measurement data in a data table.

[0019] Preferably, the processing unit processes the partial discharge data of the partial discharge module and the temperature data of the radio frequency temperature measurement module by a time-sharing data anti-collision method.

[0020] Preferably, the time-sharing data anti-collision method includes:

[0021] The processing unit transmits data with the radio frequency temperature measurement module during the working time of the radio frequency temperature measurement module duty cycle; and exchanges data with the partial discharge module during the interval of the duty cycle.

[0022] Preferably, the specific method of time-sharing data anti-collision includes:

[0023] Determine whether the temperature measurement data reception of the radio frequency temperature measurement module is interrupted;

[0024] If not, continue to transmit the temperature measurement data;

[0025] If so, determine whether the partial discharge data of the partial discharge module is interrupted;

[0026] If the partial discharge data is interrupted, resuming transmission of the partial discharge data;

[0027] If the partial discharge data is not interrupted and a request for the partial discharge data is received, transmitting the partial discharge data;

[0028] Determine whether the radio frequency temperature measurement module resumes working;

[0029] If the work is resumed, determining whether the partial discharge data has been transmitted;

[0030] If the transmission is completed, transmit the temperature measurement data;

[0031] If the transmission is not completed, the partial discharge data is interrupted and the temperature measurement data is transmitted.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows: the radio frequency temperature measurement module and the partial discharge module are integrated in the same device, which can simultaneously perform ultra-high frequency passive wireless temperature measurement and partial discharge monitoring on power equipment, timely discover and warn of faults, reduce deployment and installation costs, and improve construction and debugging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a logic block diagram of the fusion device of ultra-high frequency passive wireless temperature measurement and partial discharge monitoring of the present invention;

[0034] Figure 2 is a schematic diagram of a radio frequency antenna;

[0035] Figure 3 It is a flow chart of the time-sharing anti-collision method.

[0036] Markings in the figure: 1 RF antenna, 11 feeding point, 12 antenna unit, 2 port, 3 multi-way RF switch, 4 directional coupler, 5 RF temperature measurement module, 6 partial discharge module, 7 processing module, 8 communication unit. DETAILED DESCRIPTION

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

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0039] A fusion device for ultra-high frequency passive wireless temperature measurement and partial discharge monitoring, such as Figure 1 As shown, it includes a radio frequency antenna 1, a directional coupler 4, a radio frequency temperature measurement module 5 (RFID module), a partial discharge module 6 and a processing module 7. The radio frequency antenna 1 is connected to the directional coupler 4, and the through end and the coupling end of the directional coupler 4 are respectively connected to the radio frequency temperature measurement module 5 and the partial discharge module 6; the radio frequency temperature measurement module 5 and the partial discharge module 6 are connected to the processing module 7.

[0040] The radio frequency antenna is used to send and receive RFID signals, receive partial discharge signals, and transmit the signals to the radio frequency temperature measurement module and the partial discharge module 6 through the directional coupler 4. The radio frequency temperature measurement module identifies the RFID signal to obtain temperature measurement data, that is, temperature information; the partial discharge module identifies the partial discharge signal to obtain partial discharge data, that is, data signal; the processing module 7 further processes or saves the temperature measurement data and partial discharge data; ultra-high frequency passive wireless temperature measurement and partial discharge monitoring can be performed on the power equipment at the same time, faults can be discovered and warned in time, and the radio frequency temperature measurement module and the partial discharge module are integrated in the same device, which reduces deployment and installation costs and improves construction and debugging efficiency.

[0041] The use of directional couplers effectively solves the port fusion problem of the two RF modules, which can not only ensure simultaneous operation, but also expand the multi-channel functions of the partial discharge module and the RF temperature measurement module, thereby maximizing the utilization rate of the antenna port of the partial discharge temperature monitoring fusion device.

[0042] Figure 1 A multi-way RF switch 3 and multiple ports 2 are also shown. One end of the multi-way RF switch 3 is connected to one or more RF antennas 1 through the port 2, and the other end is connected to a directional coupler 4 to expand the antenna port. Figure 1A communication unit 8 is also shown, and the communication unit 8 is connected to the processing module 7, and the processing module 7 uploads data to the host computer through the communication unit 8. The multi-channel RF switch 3 can adopt a multi-channel design of 8, 16, or even 32 channels; the RF links of the partial discharge module and the RF temperature measurement module can be distributed to the ultra-high frequency antennas of 1 to 32 channels through the multi-channel processing unit. The RF antenna can receive the partial discharge and temperature data in the form of electromagnetic waves and input them to the multi-channel RF switch 3 through a coaxial cable.

[0043] When it is necessary to synchronously collect the partial discharge and temperature of different switch cabinets, it can be achieved through multi-channel multiplexing, that is, setting up RF antennas on different switch cabinets and connecting the RF antennas to the corresponding ports. Using the branching function of the RF switch and the coupling function of the directional coupler, two different acquisition modules work simultaneously and multiplex multiple channels.

[0044] The fusion device of the present invention includes a power module, which supplies voltage, realizes DC9-36V DC power supply, and AC220V AC power supply. The communication unit integrates RS-485 and wireless Lora transmission functions to realize upward transmission of data and complete system-level wired or wireless data docking. The communication unit can transmit data through the Modbus RTU protocol of RS485, and support the MQTT protocol of TCP / IP for data transmission; the communication unit can have two RS485 interfaces, primary and secondary. It also supports multiple fusion devices to transmit to the gateway.

[0045] Figure 2 The specific RF antenna structure is shown, including RF antenna 1, antenna unit 12 and its feeding point 11. In a specific design, the frequency band of the RF antenna 1 is 300MHz-3GHz, the RFID frequency band is 902MHz-928MHz, the standing wave of the whole frequency band is less than 1.7, and the gain of the whole frequency band reaches 3dBi; the RF antenna 1 is a microstrip directional antenna with a gain of 5dBi in the RFID frequency band; the size of the RF antenna is 150*150mm, and the low profile thickness is 10mm. PCB microstrip antenna design can be adopted.

[0046] More specifically, the partial discharge module 6 is used to convert the received electromagnetic wave signal into a digital signal for analysis, and the strength of the digital signal obtained by the analysis is the size of the electromagnetic field signal generated by the partial discharge. The radio frequency temperature measurement module 5 is used to receive and analyze RFID tag data based on the 18000-6C protocol to obtain the temperature information in the RFID tag; and to parse the temperature and ID signal of the RFID temperature tag. The processing module 7 includes an MCU control unit, which is used for data storage, filtering, data protocol conversion and transmission, etc.; the processing unit 7 can save the partial discharge data and temperature measurement data in a data table. The processing module 7 is a circuit function based on MCU and Flash. The MCU is the central processor that controls the acquisition logic of the entire fusion device.

[0047] The communication unit 8 is used to upload data to the host computer based on RS-485 and Lora. The acquisition frequency band of the partial discharge module 6 is 300MHz-3GHz, and the monitoring dynamic range is -70~10dB; the temperature measurement range of the radio frequency temperature measurement module 5 is -40~150℃, and the error is ±1℃.

[0048] The processing unit 7 processes the partial discharge data of the partial discharge module 6 and the temperature data of the radio frequency temperature measurement module 5 by a time-sharing data anti-collision method, effectively avoiding the conflict when the two data are requested at the same time. At the same time, the time-sharing anti-collision algorithm is conducive to the mutual non-interference of partial discharge and RFID radio frequency electromagnetic wave signals, which is conducive to the improvement of the monitoring sensitivity of partial discharge. Using the different data processing efficiency and time of the partial discharge module and the RFID module, the data processing logic is designed to be uneven time processing. Since the RFID radio frequency module has the advantage of duty cycle operation, the single temperature acquisition time is ms level. In principle, partial discharge data will take up more time.

[0049] Specifically, the time-sharing data anti-collision method includes:

[0050] The processing unit 7 transmits data with the radio frequency temperature measurement module during the working time of the radio frequency temperature measurement module duty cycle; and exchanges data with the partial discharge module 6 during the interval of the duty cycle.

[0051] like Figure 3 The specific method of time-sharing data anti-collision includes:

[0052] Step 101: Determine whether the temperature measurement data reception of the radio frequency temperature measurement module is interrupted.

[0053] If not, execute step 102: continue to transmit or receive the temperature measurement data.

[0054] If yes, execute step 103: determine whether the partial discharge data of the partial discharge module is interrupted.

[0055] If the partial discharge data is interrupted, step 104 is executed: resuming transmission of the partial discharge data.

[0056] If the partial discharge data is not interrupted and a request for partial discharge data is received, step 105 is executed: transmitting the partial discharge data.

[0057] Step 106: Determine whether the radio frequency temperature measurement module has resumed operation, that is, the radio frequency temperature measurement module ends the interruption.

[0058] If the operation is not resumed, execute step 107: continue to monitor the radio frequency temperature measurement module.

[0059] If the work is resumed, step 108 is executed: determining whether the transmission of the partial discharge data is completed;

[0060] If the transmission is completed, execute step 109: transmit the temperature measurement data;

[0061] If the transmission is not completed, execute step 110 : interrupt the partial discharge data, transmit the temperature measurement data, and execute step 101 .

[0062] The present invention integrates the UHF partial discharge monitoring antenna and the RFID temperature collection antenna on the same front-end radio frequency antenna 1, and integrates the local module and the radio frequency temperature measurement module in the same host. It can simultaneously realize the real-time temperature monitoring of the object being measured and the perception of the UHF electromagnetic wave signal generated by partial discharge, reduce the cost of manual inspection, and improve production efficiency. It is a multi-parameter sensing terminal integrating RFID node temperature measurement and UHF partial discharge monitoring.

[0063] The present invention can collect and process ultra-high frequency partial discharge signals and RFID temperature signals simultaneously through a multi-parameter front-end radio frequency antenna and a multi-channel back-end processing host. The radio frequency antenna of the present invention is a two-in-one partial discharge frequency band and RFID frequency band designed using ultra-wideband technology.

[0064] The ultra-high frequency detection technology for partial discharge is a non-contact detection method based on the principle of "field". The ultra-high frequency electromagnetic waves radiated during the partial discharge process are received by antenna sensors to detect partial discharge. The insulation strength and breakdown field strength of the insulators of power equipment are very high. When the partial discharge occurs in a very small range, the breakdown process will be very fast, and a partial discharge pulse current with a very steep rise edge will be generated during the breakdown process. Its rise time is in the ns level, and it excites electromagnetic wave signals with a frequency of up to several GHz. Therefore, ultra-high frequency sensors can be used to monitor the electromagnetic wave signals excited by the partial discharge current inside the electrical equipment to monitor the partial discharge of the switch cabinet.

[0065] The RFID module uses RIFD wireless temperature measurement technology, which is a wireless temperature measurement method based on radio frequency signal propagation. The transmitter transmits wireless signals and communicates with the receiver to achieve remote, non-contact measurement of temperature. The core of RFID wireless temperature measurement technology is the RFID chip, which converts temperature information into electrical signals and sends temperature data to the reader through wireless communication technology. The reader then transmits the data to the computer for processing and analysis.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fusion device of ultra-high frequency passive wireless temperature measurement and partial discharge monitoring, characterized in that: It comprises a radio frequency antenna (1), a directional coupler (4), a radio frequency temperature measurement module (5), a partial discharge module (6) and a processing module (7), The radio frequency antenna (1) is connected to a directional coupler (4), and the through end and the coupling end of the directional coupler (4) are respectively connected to a radio frequency temperature measurement module (5) and a partial discharge module (6); The radio frequency temperature measurement module (5) and the partial discharge module (6) are respectively connected to the processing module (7).

2. The fusion device according to claim 1, characterized in that: It also includes a multi-way radio frequency switch (3) and a plurality of ports (2), wherein one end of the multi-way radio frequency switch (3) is connected to one or more radio frequency antennas (1) via the port (2), and the other end is connected to a directional coupler (4).

3. The fusion device according to claim 1, characterized in that: The frequency band of the radio frequency antenna (1) is 300MHz-3GHz, the RFID frequency band is 902MHz-928MHz, the standing wave of the whole frequency band is less than 1.7, and the gain of the whole frequency band reaches 3dBi; The radio frequency antenna (1) is a microstrip directional antenna with a gain of 5 dBi in the RFID frequency band; The radio frequency antenna (1) has a size of 150*150 mm and a low profile thickness of 10 mm.

4. The fusion device according to claim 1, characterized in that: It also includes a communication unit (8), which is connected to the processing module (7).

5. The fusion device according to claim 4, characterized in that: The partial discharge module (6) is used to convert the received electromagnetic wave signal into a digital signal for analysis, and the strength of the digital signal obtained by the analysis is the magnitude of the electromagnetic field signal generated by the partial discharge; The radio frequency temperature measurement module (5) is used to receive and analyze RFID tag data based on the 18000-6C protocol to obtain temperature information in the RFID tag; The processing module (7) comprises an MCU control unit, which is used for storing, filtering and sending data; The communication unit (8) is used to upload data to a host computer based on RS-485 and Lora.

6. The fusion device according to claim 5, characterized in that: The acquisition frequency band of the partial discharge module (6) is 300 MHz-3 GHz, and the monitoring dynamic range is -70 to 10 dB; The temperature measurement range of the radio frequency temperature measurement module (5) is -40 to 150° C., with an error of ±1° C.

7. The fusion device according to claim 5, characterized in that: The processing unit (7) stores the digital signal and temperature information in a data table.

8. The fusion device according to claim 1, characterized in that: The processing unit (7) processes the partial discharge data of the partial discharge module (6) and the temperature data of the radio frequency temperature measurement module (5) by using a time-sharing data anti-collision method.

9. The fusion device according to claim 8, characterized in that: The time-sharing data anti-collision method comprises: The processing unit (7) transmits data with the radio frequency temperature measurement module (5) during the working time of the radio frequency temperature measurement module duty cycle, and exchanges data with the partial discharge module (6) during the interval of the duty cycle.

10. The fusion device according to claim 9, characterized in that: The specific method of time-sharing data anti-collision includes: Step 101: Determine whether the temperature measurement data reception of the radio frequency temperature measurement module is interrupted; If not, executing step 102: continuously transmitting the temperature measurement data; If yes, execute step 103: determine whether the partial discharge data of the partial discharge module is interrupted; If the partial discharge data is interrupted, executing step 104: resuming transmission of the partial discharge data; If the partial discharge data is not interrupted and a request for partial discharge data is received, executing step 105: transmitting the partial discharge data; Step 106: Determine whether the radio frequency temperature measurement module resumes working; If the work is resumed, step 108 is executed: determining whether the transmission of the partial discharge data is completed; If the transmission is completed, execute step 109: transmit the temperature measurement data; If the transmission is not completed, execute step 110 : interrupt the partial discharge data, transmit the temperature measurement data, and execute step 101 .

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