RFID temperature acquisition fusion device with partial discharge monitoring function

Abstract

The invention discloses an RFID temperature acquisition fusion device with a partial discharge monitoring function, which comprises a partial discharge and RFID acquisition front end, a coaxial connecting line and a fusion monitoring host, and is characterized in that the partial discharge and RFID acquisition front end comprises an ultrasonic partial discharge acquisition front end and an RFID temperature measurement front end and is connected to the fusion monitoring host through a coaxial line; the fusion monitoring host is composed of an RFID acquisition module, an ultrasonic partial discharge acquisition module, a transient earth partial discharge acquisition module, a main control board and a communication unit module. According to the invention, the earth electric wave partial discharge monitoring sensor, the ultrasonic wave partial discharge monitoring sensor and the RFID temperature acquisition antenna are integrated in the same device, and the partial discharge acquisition host and the temperature acquisition host are integrated in the same device. Real-time temperature monitoring of a measured object, sensing of an induced transient earth voltage signal generated by partial discharge and sensing of ultrasound can be realized at the same time, and the manual inspection cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of fusion of radio wave partial discharge monitoring and RFID temperature monitoring in switch cabinets, and in particular relates to an RFID temperature collection and fusion device with partial discharge monitoring function. Background Art

[0002] The switch cabinet of the power system has a small internal space, many parts, complex structure, small insulation distance, and defects such as bubble gaps, impurities, and spikes inside 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. During operation, the high voltage and strong magnetic field background of the node place high demands 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.

[0003] Traditional temperature monitoring devices and partial discharge monitoring devices can only collect and process the temperature of electrical equipment or the acoustic wave signals generated by partial discharge, and the state perception of the monitored object is not comprehensive enough. In addition, a single device needs to install more sensors in the switch cabinet, which is not convenient for on-site construction and debugging. Therefore, front-end sensors and back-end collectors based on the fusion of partial discharge monitoring and temperature monitoring are very necessary, which can greatly reduce equipment costs, labor installation costs, and improve production efficiency. Summary of the invention

[0004] In order to overcome the shortcomings of the existing monitoring devices with single data acquisition technology, the present invention provides an RFID temperature acquisition fusion device with a partial discharge monitoring function that integrates a ground wave partial discharge monitoring sensor, an ultrasonic partial discharge monitoring sensor and an RFID temperature acquisition antenna into the same device, and integrates a partial discharge acquisition host and a temperature acquisition host into the same device, which can simultaneously realize real-time temperature monitoring of the object under test and perception of the induced transient ground voltage signal generated by partial discharge and ultrasonic perception, reduce the cost of manual inspections, and improve production efficiency. The device integrates RFID node temperature measurement and ground voltage partial discharge monitoring of a multi-parameter sensing terminal.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] An RFID temperature collection and fusion device with partial discharge monitoring function comprises three parts: a partial discharge and RFID collection front end, a coaxial connecting line, and a fusion monitoring host. The partial discharge and RFID collector front end comprises an ultrasonic partial discharge collection front end and an RFID temperature measurement front end, and is connected to the fusion monitoring host via a coaxial line. The fusion monitoring host comprises an RFID collection module, an ultrasonic partial discharge collection module, a transient partial discharge collection module, a main control board, and a communication unit.

[0007] Preferably, the partial discharge and RFID collection front end includes an RFID directional high-gain antenna and an ultrasonic frequency band microphone collector. The ultrasonic microphone is integrated and installed by utilizing the magnetic field blind spot of the RFID antenna. The magnetic field-free zone where the ultrasonic frequency band microphone is located prevents the microphone from interfering with the RFID antenna. At the same time, the ultra-high frequency band of the RFID will not interfere with the analog signal collected by the ultrasonic microphone.

[0008] Preferably, the partial discharge and RFID acquisition front-end receiving circuit utilizes the bidirectional interoperability of the directional coupler to return both the RFID signal and the ultrasonic signal to the host through the same microstrip line, wherein the input and output ends are connected to the RFID signal, and the coupling end is connected to the ultrasonic signal. At the same time, the directional coupler is reused in the fusion monitoring host to separate the RFID signal and the ultrasonic signal, thereby connecting to two different acquisition and analysis modules.

[0009] Preferably, the fusion monitoring host includes a three-layer circuit board distribution, the top layer is a multi-parameter acquisition module, including an RFID radio frequency module, an ultrasonic analysis module, and a geomagnetic wave analysis module, the second layer is a fusion monitoring host, including a main control board and a communication module, and the third layer is a geomagnetic wave sensing antenna, wherein the sensing antenna surface uses a non-metallic shell.

[0010] Preferably, the fusion monitoring host has a magnetic pole structure at the bottom, which can be directly adsorbed or screwed to the inner wall of the power equipment cabinet, so that the ground wave sensing antenna can sense the voltage change on the cabinet surface at the closest distance to realize the collection of ground waves.

[0011] The present invention integrates a ground wave partial discharge monitoring sensor, an ultrasonic partial discharge monitoring sensor and an RFID temperature collection antenna into the same device, and integrates a partial discharge collection host and a temperature collection host into the same device, which can simultaneously realize real-time temperature monitoring of the object under test and perception of the induced transient ground voltage signal generated by partial discharge and ultrasonic perception, thereby reducing manual inspection costs and improving production efficiency through a multi-parameter sensing terminal that integrates RFID node temperature measurement and ground voltage partial discharge monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0013] Figure 2 It is a schematic diagram of the partial discharge and RFID acquisition front end in the present invention;

[0014] Figure 3 It is a schematic diagram of a signal transmission link of the present invention;

[0015] Figure 4 It is an internal schematic diagram of the fusion monitoring host in the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical effect and technical solution of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention is clearly and completely described below in conjunction with the drawings in the embodiment of the present invention; it is obvious that the described embodiment is a part of the embodiment of the present invention. Based on the embodiment disclosed in the present invention, other embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of the present invention.

[0017] Example 1

[0018] like Figure 1 As shown, an RFID temperature collection and fusion device with ultrasonic and ground wave partial discharge monitoring includes a two-in-one partial discharge and RFID collection front end of ultrasonic wave (ultrasonic partial discharge collection front end) and RFID antenna (RFID temperature measurement front end), a sensor antenna (coaxial connecting line) and a multi-parameter collection host (fusion monitoring host). The fusion monitoring host includes a ground wave and ultrasonic collection module (ultrasonic partial discharge collection module, transient ground partial discharge collection module), an RFID radio frequency module (RFID collection module), a collection processing unit (main control board) and a communication unit, as well as a ground wave sensing antenna integrated in the fusion monitoring host.

[0019] like Figure 2 As shown, an RFID temperature collection and fusion device with ultrasonic and geomagnetic wave partial discharge monitoring is provided. The partial discharge and RFID collection front end includes an RFID low-profile high-gain antenna, and an ultrasonic frequency band microphone integrated in the magnetic field-free area of ​​the RFID antenna. The magnetic field-free area where the ultrasonic frequency band microphone is located prevents the microphone from interfering with the RFID antenna. At the same time, the ultra-high frequency band of the RFID will not interfere with the analog signal collected by the ultrasonic microphone.

[0020] like Figure 3 As shown, a collection front-end signal link of an RFID temperature collection and fusion device with ultrasonic and ground wave partial discharge monitoring is shown. Both ultrasonic signals and RFID signals are transmitted to the fusion host through the RF coaxial cable. By using the principle of directional coupler, the collection of ultrasonic signals will not weaken the transmission of RFID signals, thereby ensuring the maximization of RFID signal energy and maximizing the RFID temperature measurement distance.

[0021] like Figure 4As shown, a fusion monitoring host with an RFID temperature collection and fusion device for ultrasonic and ground wave partial discharge monitoring has a three-layer circuit board distribution inside its non-metallic shell structure, including a layout of a multi-parameter collection module on the upper layer, a layout of a fusion host main control circuit board on the middle layer, and a layout of a ground wave sensing antenna on the lower layer. The final installation form is that the ground wave sensing antenna side of the lower layer contacts the metal wall inside the cabinet to collect the transient ground induced voltage inside the cabinet generated by partial discharge.

[0022] Example 2

[0023] The shielding layer of the switch cabinet is usually damaged and discontinuous at the insulation part, gasket connection, cable insulation terminal and other parts. In this way, the electromagnetic waves generated by partial discharge will be transmitted to the surface of the equipment through the discontinuous part of the shielding layer, generating an induced current on the surface of the equipment. There is wave impedance on the surface of the equipment, and then a transient voltage to the ground is formed on the outer layer of the equipment, referred to as TEV. The method of determining partial discharge by detecting the electromagnetic wave signal generated by partial discharge is called the transient ground voltage detection method of partial discharge. When discharge occurs inside the switch cabinet, the electromagnetic wave signal generated by the partial discharge is transmitted to the surface of the switch cabinet. The TEV sensor is fixed on the surface of the switch cabinet body, and the detected electromagnetic wave signal is converted into an electrical signal and transmitted to the acquisition system to realize partial discharge monitoring of the switch cabinet.

[0024] RFID wireless temperature measurement technology, namely radio frequency identification wireless temperature measurement technology, is a wireless temperature measurement method based on radio frequency signal propagation. It transmits wireless signals through the transmitter 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.

[0025] As a part of the present invention, the illustrative embodiments of the present invention and their description are used to explain the present invention, but do not constitute improper limitations of the present invention.

Claims

1. An RFID temperature collection and fusion device with partial discharge monitoring function, characterized in that: It includes three parts: partial discharge and RFID collection front end, coaxial connecting line, and fusion monitoring host. The partial discharge and RFID collector front end includes ultrasonic partial discharge collection front end and RFID temperature measurement front end, and is connected to the fusion monitoring host through a coaxial line. The fusion monitoring host includes RFID collection module, ultrasonic partial discharge collection module, transient partial discharge collection module, main control board and communication unit.

2. The RFID temperature collection and fusion device with partial discharge monitoring function as claimed in claim 1, characterized in that: The partial discharge and RFID collection front end includes an RFID directional high-gain antenna and an ultrasonic frequency band microphone collector. The ultrasonic microphone is integrated and installed by utilizing the magnetic field blind spot of the RFID antenna. The magnetic field-free zone where the ultrasonic frequency band microphone is located prevents the microphone from interfering with the RFID antenna. At the same time, the ultra-high frequency band of the RFID will not interfere with the analog signal collected by the ultrasonic microphone.

3. The RFID temperature collection and fusion device with partial discharge monitoring function as claimed in claim 1, characterized in that: The partial discharge and RFID acquisition front-end receiving circuit utilizes the bidirectional interoperability of the directional coupler to return both the RFID signal and the ultrasonic signal to the host through the same microstrip line, wherein the input and output ends are connected to the RFID signal, and the coupling end is connected to the ultrasonic signal. At the same time, the directional coupler is used again in the fusion monitoring host to separate the RFID signal and the ultrasonic signal, thereby connecting to two different acquisition and analysis modules.

4. The RFID temperature collection and fusion device with partial discharge monitoring function as claimed in claim 1, characterized in that: The fusion monitoring host includes a three-layer circuit board distribution. The top layer is a multi-parameter acquisition module, including an RFID radio frequency module, an ultrasonic analysis module, and a geomagnetic wave analysis module. The second layer is a fusion monitoring host, including a main control board and a communication module. The third layer is a geomagnetic wave sensing antenna, in which the sensing antenna surface uses a non-metallic shell.

5. The RFID temperature collection and fusion device with partial discharge monitoring function as claimed in claim 1, characterized in that: The fusion monitoring host has a magnetic pole structure at the bottom, which can be directly adsorbed or screwed to the inner wall of the power equipment cabinet, so that the ground wave sensing antenna can sense the voltage change on the cabinet surface at the closest distance to realize the collection of ground waves.

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