Ultrasonic detection device for partial discharge of switch cabinet

Abstract

The utility model relates to the technical field of switch cabinet partial discharge detection, and particularly discloses a switch cabinet partial discharge ultrasonic detection device which comprises a partial discharge switch cabinet, an ultrasonic sensor connected to the partial discharge switch cabinet, a pre-amplifier connected to the ultrasonic sensor, a filter connected to the pre-amplifier, and a power supply connected to the filter. The filter is connected with a data acquisition card, the data acquisition card is connected with an upper computer, the ultrasonic sensor is used for acquiring ultrasonic signals generated by discharge of the partial discharge switch cabinet, the pre-amplifier is used for amplifying the signals to a normal level, and the filter is used for filtering noise signals in the signals. The data acquisition card is used for converting analog signals into digital signals, and the ultrasonic sensor is connected with the preamplifier through a coaxial cable. According to the utility model, the piezoelectric ceramic ultrasonic sensor detection technology is adopted, so that the partial discharge phenomenon in the switch cabinet can be detected; and the potential safety hazard caused by the partial discharge phenomenon of the electrical switch cabinet is reduced.

Description

Technical Field

[0001] This utility model relates to the field of partial discharge detection technology for switchgear, and in particular to an ultrasonic detection device for partial discharge in switchgear. Background Technology

[0002] During the production and design of switchgear, burrs are often unavoidably generated, forming sharp protrusions on the metal surface. When the equipment operates under high voltage, charges easily accumulate at the metal tips, creating a large electric field in this area. As the equipment's operating state changes, nearby charges will collide more significantly. When the electric field reaches a certain critical value, charges in the surrounding gaseous medium can easily transfer to the charges at the tips, causing corona discharge. Partial discharge is essentially the movement and collision cancellation of charges. This process produces many concrete phenomena, such as chemical products, ultrasonic waves, light, electromagnetic radiation, and electrical pulses. The work done by electrical energy also causes the temperature of the discharge area to rise. The reason why partial discharge is called partial is because the discharge phenomenon is still in its initial stage and is not yet sufficient to cause breakdown of the equipment structure. Therefore, the parts that do not discharge at this time retain their original characteristics, which is a clear characteristic of partial discharge.

[0003] If equipment is exposed to high voltage for an extended period of time and this potential hazard is not addressed, it will eventually undergo a qualitative change, causing the equipment to break down completely and resulting in a safety accident. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a partial discharge ultrasonic detection device for switchgear, which solves the technical problem that if the equipment is exposed to a high voltage environment for a long time and the potential hazard is not eliminated, it will eventually cause a qualitative change, leading to the complete breakdown of the equipment and causing a safety accident.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An ultrasonic detection device for partial discharge of switchgear includes a partial discharge switchgear, an ultrasonic sensor connected to the switchgear, a preamplifier connected to the ultrasonic sensor, a filter connected to the preamplifier, a data acquisition card connected to the filter, and a host computer connected to the data acquisition card. The ultrasonic sensor is used to collect ultrasonic signals generated by the partial discharge of the switchgear, the preamplifier is used to amplify the signals to a normal level, the filter is used to filter out noise signals in the signals, and the data acquisition card converts the analog signals into digital signals and transmits them to the host computer.

[0007] Preferably, the ultrasonic sensor is a piezoelectric ceramic ultrasonic sensor, comprising a housing, a horn-shaped resonator, piezoelectric ceramic, and lead terminals.

[0008] Preferably, the preamplifier is an SR560 type preamplifier.

[0009] Preferably, the data acquisition card is a USB-6361 NI type data acquisition card.

[0010] Preferably, the host computer is a PC.

[0011] Preferably, the ultrasonic sensor is connected to the preamplifier via a coaxial cable.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention utilizes piezoelectric ceramic ultrasonic sensor detection technology to detect partial discharge phenomena in switchgear, thereby reducing safety hazards caused by partial discharge phenomena in electrical switchgear. Attached Figure Description

[0014] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the structural principle of this utility model;

[0016] Figure 2 This is a schematic diagram of the ultrasonic sensor structure of this utility model.

[0017] Legend: 1. Partial discharge switch cabinet; 2. Ultrasonic sensor; 201. Housing; 202. Horn resonator; 203. Piezoelectric ceramic; 204. Lead terminal; 3. Preamplifier; 4. Filter; 5. Data acquisition card; 6. Host computer. Detailed Implementation

[0018] This application provides a partial discharge ultrasonic detection device for switchgear, which effectively solves the problem that if the equipment is exposed to a high voltage environment for a long time and the potential danger is not eliminated, it will eventually cause a qualitative change, leading to complete breakdown of the equipment and causing a safety accident. This utility model uses piezoelectric ceramic ultrasonic sensor detection technology to detect partial discharge phenomena in switchgear and reduces the safety hazards caused by partial discharge phenomena in electrical switchgear. Example

[0019] like Figure 1 and Figure 2As shown, the technical solution in this application embodiment effectively solves the technical problem that if equipment is exposed to a high voltage environment for a long time and this hidden danger is not eliminated, it will eventually cause a qualitative change, leading to complete breakdown of the equipment and causing a safety accident. The overall idea is as follows: A partial discharge ultrasonic detection device for switchgear includes a partial discharge switchgear 1, an ultrasonic sensor 2 connected to the partial discharge switchgear 1, a preamplifier 3 connected to the ultrasonic sensor 2, a filter 4 connected to the preamplifier 3, a data acquisition card 5 connected to the filter 4, and a host computer 6 connected to the data acquisition card 5. The ultrasonic sensor 2 is used to collect the ultrasonic signal generated by the discharge of the partial discharge switchgear 1. The preamplifier 3 is used to amplify the signal to a normal level. The filter 4 is used to filter out noise signals in the signal. The data acquisition card 5 converts the analog signal into a digital signal and transmits it to the host computer 6. The ultrasonic sensor 2 is a piezoelectric ceramic ultrasonic sensor, including a housing 201, a horn-shaped resonator 202, a piezoelectric ceramic 203, and lead terminals 204. The preamplifier 3 is an SR560 type preamplifier, and the data acquisition card 5 is a USB-6361. The NI type data acquisition card has a PC as the host computer (6), and the ultrasonic sensor (2) and preamplifier (3) are connected via a coaxial cable.

[0020] To address the problems existing in the prior art, this utility model provides an ultrasonic detection device for partial discharge in switchgear. This utility model uses piezoelectric ceramic ultrasonic sensor detection technology to detect partial discharge phenomena in switchgear and reduces the safety hazards caused by partial discharge phenomena in electrical switchgear.

[0021] Working principle:

[0022] When an ultrasonic signal acts on the piezoelectric ceramic 203, the piezoelectric ceramic 203 generates a piezoelectric effect, converting the ultrasonic signal into an electrical signal. This completes the acquisition of the ultrasonic signal generated by the partial discharge in the switchgear 1. The acquired electrical signal is usually quite weak. The preamplifier 3 amplifies the weak signal output by the ultrasonic sensor 2 to a normal level. Then, the amplified signal is filtered by the filter 4 to remove noise signals. The filtered signal is an analog signal. The data acquisition card 5 converts the analog signal into a digital signal. The converted digital signal is transmitted to the host computer 6 through a corresponding transmission method. After receiving the digital signal transmitted by the data acquisition card 5, the host computer 6 uses relevant software or algorithms to analyze and process the signal. By analyzing the signal characteristics, it determines whether there is a partial discharge phenomenon in the switchgear, as well as the degree and location of the partial discharge, thereby realizing the detection of partial discharge phenomena in the switchgear and reducing safety hazards caused by partial discharge phenomena in electrical switchgear.

[0023] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A partial discharge ultrasonic detection device for switchgear, comprising a partial discharge switchgear (1), characterized in that, An ultrasonic sensor (2) is connected to the partial discharge switch cabinet (1). A preamplifier (3) is connected to the ultrasonic sensor (2). A filter (4) is connected to the preamplifier (3). A data acquisition card (5) is connected to the filter (4). A host computer (6) is connected to the data acquisition card (5). The ultrasonic sensor (2) is used to collect the ultrasonic signal generated by the discharge of the partial discharge switch cabinet (1). The preamplifier (3) is used to amplify the signal to a normal level. The filter (4) is used to filter out noise signals in the signal. The data acquisition card (5) converts the analog signal into a digital signal and transmits it to the host computer (6).

2. The ultrasonic partial discharge detection device for switchgear as described in claim 1, characterized in that, The ultrasonic sensor (2) is a piezoelectric ceramic ultrasonic sensor, including a housing (201), a horn-shaped resonator (202), a piezoelectric ceramic (203), and lead terminals (204).

3. The ultrasonic partial discharge detection device for switchgear as described in claim 1, characterized in that, The preamplifier (3) is an SR560 type preamplifier.

4. The ultrasonic partial discharge detection device for switchgear as described in claim 1, characterized in that, The data acquisition card (5) is a USB-6361 NI type data acquisition card.

5. The ultrasonic partial discharge detection device for switchgear as described in claim 1, characterized in that, The host computer (6) is a PC.

6. The ultrasonic partial discharge detection device for switchgear as described in claim 1, characterized in that, The ultrasonic sensor (2) is connected to the preamplifier (3) via a coaxial cable.

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