Remote partial discharge ultrasonic signal interference searching device

Abstract

The utility model discloses a remote partial discharge ultrasonic signal interference searching device, which comprises a packaging bin, a wave concentrator is arranged at one end in the packaging bin in a threaded manner, and an ultrasonic sensor is mounted at the junction of the packaging bin and the wave concentrator; the device has a waveform and amplitude synchronous display function, when ultrasonic signals generated by interference are received, the amplitude of the ultrasonic signals and a real-time phase spectrum are synchronously displayed on a screen, the interference position can be determined according to the amplitude change in combination with a laser sighting device, and the type of the interference signals can be judged according to spectrum information. The wave concentrator adopts a single-cylinder straight-through type structural design, ultrasonic waves emitted by interference signals in different distance coverage ranges are converged and directly transmitted, the problem of energy loss caused by signal reflection brought by a refraction disc structure of existing equipment is solved, the coverage range can be controlled by specially designing the angle of the wave concentrator, and the wave concentrator is high in practicability. And maximization of signal transmission energy is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field related to interference search equipment, in particular to a remote local discharge ultrasonic signal interference search device. Background Art

[0002] Partial discharge is a key indicator that reflects the operating status of the internal insulation system of high-voltage electrical equipment. It is both a precursor to insulation degradation and a product of reduced insulation performance. Partial discharge detection has become a routine task for condition maintenance in power systems. The difficulty in partial discharge detection is to distinguish whether the detected signal is an external interference signal. There are many sources of interference signals, which are mainly divided into power supply interference, ground interference and space interference. These interference signals will radiate electromagnetic waves and ultrasonic signals into space at the same time. At present, the search for these interference signals is based on electromagnetic signals. This search equipment requires a high-speed sampling oscilloscope, a signal transmission system and a receiving antenna. The equipment is large in size, has many types and high cost. It is generally used in high-voltage test halls and is difficult to apply on-site.

[0003] The external interference signal search equipment based on ultrasonic signals has a series of advantages such as simple structure and easy operation. The existing interference search equipment based on ultrasonic signals adopts the principle of reflected waves. The ultrasound emitted by the external interference signal is first radiated to the receiving disk of the equipment, and the receiving disk then focuses the signal onto the ultrasonic signal sensor. The main problems are large signal loss and poor directionality. Utility Model Content

[0004] In order to solve the defects of the prior art, the utility model provides a remote partial discharge ultrasonic signal interference search device, which solves the problems of energy loss and poor directivity caused by signal reflection caused by the refraction disk structure of the prior equipment.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] The utility model discloses a remote local discharge ultrasonic signal interference search device, comprising a packaging bin, wherein a wave condenser is threadedly arranged at one end inside the packaging bin, and the wave condenser is a structure with an inner radially enlarged end, an ultrasonic sensor is installed at the intersection of the packaging bin and the wave condenser, and a circuit board is installed inside the packaging bin.

[0007] As a preferred technical solution of the utility model, a handle is fixedly provided at the lower right end of the packaging bin, and a battery is installed inside the handle.

[0008] As a preferred technical solution of the utility model, a laser sight is installed at one end of the packaging bin through four screws and is distributed in parallel with the wave condenser.

[0009] As a preferred technical solution of the utility model, a display screen is installed at the lower end of the packaging bin through a pressure plate, and three operation buttons are arranged on the rear end wire of the display screen.

[0010] As a preferred technical solution of the utility model, the outer ends of the circuit board are respectively provided with the battery, the display screen, the laser sight and the ultrasonic sensor wires.

[0011] As a preferred technical solution of the utility model, a camera is arranged at the outer end of the laser sight, and the two are integrated.

[0012] As a preferred technical solution of the utility model, two metal plates are arranged inside the ultrasonic sensor, one of the metal plates is coated with an electret film and is grounded.

[0013] The beneficial effects of the utility model are:

[0014] 1. This is a remote partial discharge ultrasonic signal interference search device. The wave condenser adopts a single-tube straight-through structure design to converge the ultrasonic waves emitted by interference signals within different coverage distances and directly transmit them, solving the energy loss problem caused by signal reflection caused by the refraction disk structure of existing equipment. The coverage range can be controlled by the angle of the specially designed wave condenser to ensure the maximization of signal transmission energy.

[0015] 2. This remote partial discharge ultrasonic signal interference search device has the function of synchronous display of waveform and amplitude. When receiving the ultrasonic signal generated by interference, the ultrasonic signal amplitude and real-time phase spectrum are synchronously displayed on the screen. The interference position can be determined according to the change in amplitude combined with the laser aimer, and the type of interference signal can be judged according to the spectrum information.

[0016] 3. This remote partial discharge ultrasonic signal interference search device uses the principle of ultrasonic wave focusing to directionally receive the ultrasonic signal generated by the partial discharge interference signal, senses it through the ultrasonic sensor at the tail end of the wave focuser, and then processes the signal through the amplification and detection circuit, so as to accurately find the external interference signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of a remote partial discharge ultrasonic signal interference search device of the utility model;

[0019] Figure 2It is a three-dimensional cross-sectional view of a remote partial discharge ultrasonic signal interference search device of the utility model;

[0020] Figure 3 This is a partial enlarged view of A of a remote partial discharge ultrasonic signal interference search device of the utility model;

[0021] Figure 4 The utility model is a side view of a remote local discharge ultrasonic signal interference search device.

[0022] In the figure: 1. Packaging chamber; 2. Wave condenser; 3. Ultrasonic sensor; 4. Circuit board; 5. Handle; 6. Battery; 7. Laser aimer; 8. Display screen; 9. Operation button. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0024] Example: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the utility model is a remote partial discharge ultrasonic signal interference search device, including a packaging bin 1, a wave condenser 2 is threadedly arranged at one end inside the packaging bin 1, and the wave condenser 2 is a structure with an inner radially enlarged end, an ultrasonic sensor 3 is installed at the junction of the packaging bin 1 and the wave condenser 2, and a circuit board 4 is installed inside the packaging bin 1.

[0025] A handle 5 is fixedly provided at the lower right end of the packaging bin 1 , and a battery 6 is installed inside the handle 5 . The battery 6 is used for power supply, and the handle 5 is convenient for the user to hold.

[0026] Among them, a laser sight 7 is installed at one end of the packaging bin 1 through four screws and is distributed in parallel with the wave condenser 2. The laser sight 7 determines the interference position. At the same time, the laser sight 7 and the camera are used for precise control to accurately locate the spatial position of the external interference source.

[0027] Among them, a display screen 8 is installed at the lower end of the packaging bin 1 through a pressure plate, and three operation buttons 9 are set on the rear end wire of the display screen 8. The display screen 8 superimposes the ultrasonic signal amplitude and phase spectrum information with the information collected by the laser aimer 7 and the camera.

[0028] The outer ends of the circuit board 4 are respectively connected to the battery 6, the display screen 8, the laser aimer 7 and the ultrasonic sensor 3, which is an integrated design and utilizes the space inside the packaging bin.

[0029] Among them, a camera is arranged at the outer end of the laser sight 7, and the two are integrated. The wave focuser 2 uses the laser sight 7 and the camera for precise control while receiving the external interference signal, accurately locates the spatial position of the external interference source, and collects the light source information and position of the external display through the integrated camera.

[0030] Among them, two metal plates are arranged inside the ultrasonic sensor 3, one of which is coated with an electret film and grounded. Vibration changes the distance between the two plates, causing the size of the voltage change, which reflects the strength of the external sound pressure.

[0031] When working, the wave focuser 2 focuses the received ultrasonic signal and transmits it to the ultrasonic sensor. There are two metal plates inside the ultrasonic sensor, one of which is coated with an electret film, mostly polyperfluoroethylene propylene, and is grounded. The other plate is connected to the gate of the field effect transistor, and a diode is connected between the gate and the source. When the electret film itself carries an electric charge, the surface charge is Q, and the capacitance between the plates is C, then a voltage U=Q / C is generated on the pole head. When it is vibrated or rubbed by airflow, the distance between the two plates changes due to vibration, that is, the capacitance C changes, while the electric quantity Q remains unchanged, which will cause a change in voltage. The magnitude of the voltage change reflects the strength of the external sound pressure. The frequency of this voltage change reflects the change of the external sound wave, and the sound wave signal is described by the voltage signal, and the signal is transmitted to the device circuit. The circuit and packaging chamber 1 is responsible for detecting and amplifying the voltage signal reflecting the external sound wave signal, and converting the collected voltage signal into a digital signal through AD, which is processed by the processor to display the amplitude and graphical interface, and these signals are displayed on the display screen 8. While receiving the external interference signal, the wave condenser 2 uses the laser sight 7 and the camera for precise control, accurately locates the spatial position of the external interference source, collects the light source information and position of the external display through the integrated camera, and synchronously inputs the collected information page to the display screen 8 for display. The display screen 8 superimposes the ultrasonic signal amplitude and phase spectrum information with the information collected by the laser sight 7 and the camera for display.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A remote partial discharge ultrasonic signal interference search device, comprising a packaging chamber (1), characterized in that: A wave condenser (2) is threadedly provided at one end of the packaging bin (1), and the wave condenser (2) is a structure with an inner radially enlarged end. An ultrasonic sensor (3) is installed at the intersection of the packaging bin (1) and the wave condenser (2), and a circuit board (4) is installed inside the packaging bin (1).

2. A remote partial discharge ultrasonic signal interference search device according to claim 1, characterized in that: A handle (5) is fixedly provided at the lower right end of the packaging bin (1), and a battery (6) is installed inside the handle (5).

3. A remote partial discharge ultrasonic signal interference search device according to claim 1, characterized in that: A laser sight (7) is installed at one end of the packaging bin (1) via four screws and is distributed in parallel with the wave condenser (2).

4. A remote partial discharge ultrasonic signal interference search device according to claim 1, characterized in that: A display screen (8) is installed at the lower end of the packaging bin (1) via a pressure plate, and three operating buttons (9) are arranged on the rear end wire of the display screen (8).

5. The remote partial discharge ultrasonic signal interference search device according to claim 1, characterized in that: The outer ends of the circuit board (4) are respectively connected to the battery (6), the display screen (8), the laser sight (7) and the ultrasonic sensor (3) wires.

6. A remote partial discharge ultrasonic signal interference search device according to claim 3, characterized in that: The outer end of the laser sight (7) is provided with a camera, and the two are integrated.

7. The remote partial discharge ultrasonic signal interference search device according to claim 1, characterized in that: Two metal plates are arranged inside the ultrasonic sensor (3), one of the metal plates is coated with an electret film and is grounded.

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