Vacuum bubble type insulation monitoring device

Abstract

The utility model provides a vacuum bubble type insulation monitoring device, and relates to the technical field of power grid insulation monitoring, the vacuum bubble type insulation monitoring device comprises an electric control cabinet and a vacuum bubble structure installed in an inner cavity of the electric control cabinet, the vacuum bubble structure comprises an insulation shell, and a shielding cover is arranged in the middle of the inner side of the insulation shell; two groups of electrified contacts are arranged in the middle of the inner side of the shielding cover and are respectively a static contact and a moving contact, and the static contact is positioned in the middle of the upper end of the moving contact; metal guide rods are arranged in the middles of the two ends of the shielding cover and include the upper conductive rod and the lower conductive rod, the top end of the static contact is connected with the upper conductive rod, and the bottom end of the moving contact is connected with the lower conductive rod. The middle of the bottom end of the moving contact is connected with a corrugated pipe which is located at the bottom of the inner side of the shielding cover and extends out of the shielding cover. The utility model discloses a novel structure.

Description

Technical Field

[0001] This utility model relates to the field of power grid insulation monitoring technology, specifically a vacuum bubble insulation monitoring device. Background Technology

[0002] An online insulation monitoring device for power equipment is a device capable of monitoring the insulation status of high-voltage vacuum circuit breakers and vacuum contactors online. High-voltage electrical equipment plays an irreplaceable role in the power grid; if its insulation deteriorates or has defects, it may affect the normal operation of the power grid equipment, potentially leading to safety accidents. Previously, equipment maintenance and testing were carried out during power grid operation through periodic power outages, which could easily impact the factory's electrical environment.

[0003] To address this, we propose a vacuum bubble insulation monitoring device. Vacuum bubble insulation online monitoring technology is a guarantee for the reliable operation of the power grid. Through analysis of the actual operating conditions of high-voltage equipment, we summarize the advantages and practicality of online insulation detection technology. Through detailed investigation and analysis, we aim to ensure the reliable operation of electrical equipment, reduce equipment downtime for maintenance, improve the intelligent power consumption of modern factories, increase power efficiency, reduce power risks, and provide a good environment for factory power consumption. Utility Model Content

[0004] To address the problems in the background art, this utility model provides a vacuum bubble insulation monitoring device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A vacuum bubble insulation monitoring device includes an electrical control cabinet and a vacuum bubble structure installed inside the electrical control cabinet. The vacuum bubble structure includes an insulating shell, and a shielding cover is provided in the middle of the inner side of the insulating shell.

[0007] The shielding cover has two sets of live contacts in the middle of its inner side, namely a stationary contact and a moving contact. The stationary contact is located in the middle of the upper end of the moving contact. Metal guide rods are provided in the middle of both ends of the shielding cover, namely an upper conductive rod and a lower conductive rod. The top end of the stationary contact is connected to the upper conductive rod, and the bottom end of the moving contact is connected to the lower conductive rod.

[0008] Preferably, a bellows is connected to the middle of the bottom end of the moving contact, the bellows being located at the bottom inner side of the shield and extending outward from the shield.

[0009] Preferably, the upper conductive rod and the lower conductive rod are respectively disposed at the middle of both ends of the insulating shell and extend outward from the insulating shell.

[0010] Preferably, the lower conductive rod passes through the middle of the inner side of the bellows.

[0011] Preferably, a fixing member is provided in the middle of the outer surface of the shielding cover, and the shielding cover is fixedly installed in the middle of the inner side of the insulating shell by the fixing member.

[0012] Preferably, the electrical control cabinet has a control panel on its front side.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This solution proposes a vacuum bubble-type insulation monitoring device. Its main technology involves analyzing the actual operating conditions of high-voltage equipment through a vacuum bubble structure, summarizing the advantages and practicality of online insulation detection technology, and providing a good environment for reliable operation of electrical equipment, reducing equipment downtime for maintenance, improving the intelligent power consumption mode of modern factories, increasing power efficiency, reducing power consumption risks, and providing a good environment for factory power consumption. Attached Figure Description

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

[0016] Figure 2 This is a schematic diagram of the electrical control cabinet structure of this utility model.

[0017] In the diagram: 1. Insulating shell; 2. Shielding cover; 3. Upper conductive rod; 4. Stationary contact; 5. Moving contact; 6. Corrugated pipe; 7. Lower conductive rod; 8. Fixture; 9. Electrical control cabinet; 10. Control panel. Detailed Implementation

[0018] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0019] Example: Refer to Figure 1 - Figure 2 As shown, a vacuum bubble insulation monitoring device of this embodiment includes an electrical control cabinet 9 and a vacuum bubble structure installed inside the electrical control cabinet 9. The vacuum bubble structure includes an insulating shell 1, and a shielding cover 2 is provided in the middle of the inner side of the insulating shell 1. Two sets of live contacts are provided in the middle of the inner side of the shielding cover 2, namely a stationary contact 4 and a moving contact 5. The stationary contact 4 is located in the middle of the upper end of the moving contact 5. Metal guide rods are provided in the middle of both ends of the shielding cover 2, namely an upper conductive rod 3 and a lower conductive rod 7. The top end of the stationary contact 4 is connected to the upper conductive rod 3, and the bottom end of the moving contact 5 is connected to the lower conductive rod 7.

[0020] During use, the metal rod and live contact of the vacuum switch are equivalent to a capacitor with respect to the shield 2, and the shield 2 of the vacuum switch is also equivalent to a capacitor with respect to the ground.

[0021] A bellows 6 is connected to the middle of the bottom of the moving contact 5. The bellows 6 is located at the bottom of the inner side of the shield 2 and extends outward from the shield 2.

[0022] In some examples, the upper conductive rod 3 and the lower conductive rod 7 are respectively disposed at the middle of both ends of the insulating shell 1 and extend outward from the insulating shell 1.

[0023] In some examples, the lower conductive rod 7 passes through the middle of the inner side of the bellows 6.

[0024] In some examples, a fastener 8 is provided in the middle of the outer surface of the shield 2, and the shield 2 is fixedly installed in the middle of the inner side of the insulating shell 1 by the fastener 8.

[0025] In some examples, the control panel 10 is located on the front of the electrical control cabinet 9.

[0026] The working principle of this utility model is as follows:

[0027] When the vacuum level in the arc-extinguishing chamber is normal, only a few hundred volts are needed to maintain the electron current induced by field emission between the energized contact and the intermediate shield 2. The charge accumulated on the shield 2 results in a high potential on it, which can approach the peak value of the power supply voltage and is relatively stable. The metal conductor and energized contact of the vacuum switch are equivalent to a capacitor with respect to the shield 2, and the shield 2 of the vacuum switch is also equivalent to a capacitor with respect to ground. When the vacuum level decreases, the gas density in the arc-extinguishing chamber increases, and the increase in internal gas pressure leads to an increase in gas molecules, metal particles, and various other particles, thereby causing a decrease in insulation properties, a decrease in pre-breakdown voltage, an increase in the probability of pre-breakdown, and pre-discharge. This causes a decrease in the potential of the shield 2 and a change in the electric field strength around the vacuum switch. This change is not very obvious when the internal gas pressure first changes, but the change in electric field becomes very obvious at a certain value, and then tends to slow down. Its change curve is similar to that of a low-pass filter.

[0028] Therefore, by using this curve and applying a specific microwave signal to penetrate the VCB and collecting the changes in the feedback signal, the trend of internal gas pressure changes can be better determined, thus accurately judging the insulation condition of the vacuum switch.

[0029] Vacuum bubbles reflect the rarefaction of gases. The higher the vacuum level, the better. When the vacuum level decreases, the pressure increases, the gas density increases, the number of various gas particles (metal particles) increases, and the insulation properties decrease.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A vacuum bubble-type insulation monitoring device, characterized in that, It includes an electrical control cabinet (9) and a vacuum bubble structure installed inside the electrical control cabinet (9). The vacuum bubble structure includes an insulating shell (1) and a shield (2) is provided in the middle of the inner side of the insulating shell (1). The shield (2) has two sets of live contacts in the middle of its inner side, namely a stationary contact (4) and a moving contact (5), with the stationary contact (4) located in the middle of the upper end of the moving contact (5). Metal guide rods are provided at the middle of both ends of the shield (2), namely the upper conductive rod (3) and the lower conductive rod (7). The top end of the stationary contact (4) is connected to the upper conductive rod (3), and the bottom end of the moving contact (5) is connected to the lower conductive rod (7). The bottom center of the moving contact (5) is connected to a bellows (6), which is located at the bottom of the inner side of the shield (2) and extends outward from the shield (2).

2. The vacuum bubble insulation monitoring device according to claim 1, characterized in that, The upper conductive rod (3) and the lower conductive rod (7) are respectively disposed at the middle of both ends of the insulating shell (1) and extend outward from the insulating shell (1).

3. The vacuum bubble insulation monitoring device according to claim 2, characterized in that, The lower conductive rod (7) passes through the middle of the inner side of the bellows (6).

4. The vacuum bubble insulation monitoring device according to claim 3, characterized in that, A fixing member (8) is provided in the middle of the outer surface of the shield (2), and the shield (2) is fixedly installed in the middle of the inner side of the insulating shell (1) by the fixing member (8).

5. A vacuum bubble insulation monitoring device according to claim 4, characterized in that, The control panel (10) is provided on the front of the electrical control cabinet (9).

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