A bolt protection cover tool for preventing breakage

Abstract

The utility model provides a kind of bolt protection cover tooling of anti-breakdown, including bolt protection cover, the installation bolt is vertically arranged on the bottom surface of conductor holder, bolt includes nut and screw rod, the screw rod is threadedly connected with PT support insulator, the outside of nut is sleeved with bolt protection cover, and PT fuse is arranged above the nut and is connected with the side surface of conductor holder vertically;The utility model can effectively separate the bolt of PT porcelain bottle and PT fuse by specific protection cover device, and can homogenize the electric field distribution in gap, reduce the risk of PT fuse breakdown.

Description

Technical Field

[0001] This invention relates to the field of electrical installations, and more specifically to a bolt protection cover fixture for protection against breakdown. Background Technology

[0002] High-voltage PT cabinets, as crucial equipment in high-voltage power distribution systems, primarily function to measure voltage, provide voltage circuits for measuring instruments, supply operating and control power, and house overvoltage protectors for each bus section. The fuses installed on the high-voltage side of the voltage transformer (PT) within the PT cabinet mainly protect the PT itself. When various faults cause a sudden increase in primary current, the fuse quickly blows, isolating the fault and ensuring uninterrupted system operation. It also prevents further damage to the equipment, making it a simple protective device.

[0003] Currently, in existing high-voltage PT switchgear, a PT fuse (such as...) is placed above the PT insulator bolts. Figure 6 As shown in the figure, because there is a small gap between the bolt of the PT insulator and the PT fuse, and the distribution is uneven, the dielectric constant of the bolt is much greater than that of air. Therefore, the electric field strength in the gap can be very large. Once the electric field value exceeds the critical value, a discharge phenomenon will occur in the gap, which will cause the PT fuse to break down in severe cases. Summary of the Invention

[0004] In view of the technical problems existing in the background art, the present invention provides a bolt protection cover fixture for preventing breakdown. Through a specific protective cover device, the bolt of the PT porcelain insulator can be effectively separated from the PT fuse, and the electric field distribution in the gap can be homogenized to reduce the risk of PT fuse breakdown.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A bolt protection cover fixture for protection against breakdown includes a bolt protection cover. The mounting bolt is vertically installed on the bottom surface of the conductor holder. The bolt includes a nut and a screw. The screw is threadedly connected to the PT support insulator. The bolt protection cover is sleeved on the outside of the nut. A PT safety device is provided above the nut and is perpendicularly connected to the side surface of the conductor holder.

[0006] In a preferred embodiment, the bolt protective cover is composed of two halves joined together. The bolt protective cover includes a metal base and an insulating shell, wherein the insulating shell is fixedly connected to the outer wall of the metal base.

[0007] In a preferred embodiment, a buckle device is provided on one side of the metal base, and a slot is provided on the other side of the metal base. The bolt guard is connected to the bolt guard by the buckle device and the slot.

[0008] In a preferred embodiment, the protective cover insulating shell is made of insulating material, the top surface of the protective cover insulating shell has a double-layer structure and a vacuum layer is formed in the middle, and a semiconductor layer is provided on the inner side of the protective cover insulating shell.

[0009] In a preferred embodiment, the metal base has a retaining plate inside, one side of which is tightly attached to a nut, and the other side of which is vertically connected to a telescopic rod. The other side of the telescopic rod is vertically connected to the inner wall of the metal base and can slide along the axial direction. A spring is provided on the outer wall of the telescopic rod, one end of which is connected to the retaining plate, and the other end of which is connected to the inner wall of the metal base.

[0010] This patent can achieve the following beneficial effects: 1. This invention separates the bolts of the PT fuse and the PT porcelain insulator by setting a protective insulating shell on the outside of the bolt, thus preventing discharge phenomena caused by excessive gaps between the two and effectively protecting the PT fuse from being broken down by current. 2. By setting a clamping plate, the bolt guard can be used for bolts of different sizes, which effectively improves the applicability of the device. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the overall structure of the present invention broken down; Figure 3 This is a schematic diagram of the overall structure of the present invention. Figure 2 ; Figure 4 This is an enlarged schematic diagram of the insulating shell structure of the protective cover of the present invention; Figure 5 This is a schematic diagram of the internal structure of the metal base of the present invention; Figure 6 This is a schematic diagram of the original installation method of the present invention.

[0012] In the diagram: 1. Conductor holder; 2. Mounting bolt; 3. Nut; 4. Screw; 5. PT support insulator; 6. Bolt protective cover; 7. Protective cover insulation shell; 8. Vacuum layer; 9. Semiconductor layer; 10. Metal base; 11. Snap-fit ​​device; 12. Slot; 13. Snap plate; 14. Telescopic rod; 15. Spring. Detailed Implementation

[0013] like Figure 1As shown, a bolt protection cover fixture for preventing breakdown includes a bolt protection cover 5. The mounting bolt 2 is vertically installed on the bottom surface of the conductor holder 1. The bolt includes a nut 201 and a screw 202. The screw 202 is threadedly connected to the PT support insulator 3. The bolt protection cover 5 is sleeved on the outside of the nut 201 to isolate the mounting bolt 2 and the PT safety 4. The PT safety 4 is provided above the nut 201 and is perpendicularly connected to the side surface of the conductor holder 1.

[0014] Preferred solutions include Figure 2 and Figure 3 As shown, the bolt protective cover 5 is composed of two halves spliced ​​together. The bolt protective cover 5 includes a metal base 7 and a protective cover insulating shell 6. The protective cover insulating shell 6 is fixedly connected to the outer wall of the metal base 7. The metal base 7 allows the device to be adapted to nuts 201 of different sizes. The protective cover insulating shell 6 can effectively isolate the nut 201 and the PT fuse 4, preventing the discharge phenomenon caused by the small gap between them. It can also homogenize the electric field distribution in the gap, thereby avoiding the current breakdown of the PT fuse 4.

[0015] Preferred solutions include Figure 2 and Figure 3 As shown, a buckle device 8 is provided on the side of the metal base 7 on one side, and a slot 9 is provided on the side of the metal base 7 on the other side. The bolt protective cover 5 is spliced ​​together by the buckle device 8 and the slot 9. This structure can also realize the quick installation of the bolt protective cover 5 and facilitate the installation work in a narrow space.

[0016] Preferred solutions include Figure 4 As shown, the protective cover insulating shell 6 is made of insulating material. The top surface of the protective cover insulating shell 6 has a double-layer structure and a vacuum layer 601 is formed in the middle. This structure can greatly improve the insulation of the top surface of the protective cover insulating shell 6 and prevent current from breaking down the protective cover insulating shell 6. A semiconductor layer 602 is provided on the inner layer of the protective cover insulating shell 6. The semiconductor layer 602 is usually made of silicon carbide (SiC), which can effectively homogenize the electric field around the nut 201 and prevent the electric field from concentrating at a certain point and causing a discharge phenomenon.

[0017] Preferred solutions include Figure 5 As shown, the metal base 7 has a retaining plate 10 inside. One side of the retaining plate 10 is tightly attached to the nut 201, and the other side of the retaining plate 10 is vertically connected to a telescopic rod 11. The other side of the telescopic rod 11 is vertically connected to the inner wall of the metal base 7 and can slide along the axial direction. A spring 12 is provided on the outer wall of the telescopic rod 11. One end of the spring 12 is connected to the retaining plate 10, and the other end of the spring 12 is connected to the inner wall of the metal base 7. When the metal base 7 is snapped onto the outside of the nut 201, the clamping plate 10 will be pressed tightly against the nut 201. At this time, the spring 12 is compressed and the clamping plate 10 is pressed inward, thereby ensuring that the clamping plate 10 is always pressed tightly against the nut 201, so that the nut 201 and the metal base 7 are at the same potential, and further preventing the generation of discharge phenomenon.

[0018] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The various technical features described in the present invention can be combined with each other without conflict. The scope of protection of the present invention should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A bolt protection cover fixture for protection against puncture, comprising a bolt protection cover (5) and mounting bolts (2), characterized in that: The mounting bolt (2) is vertically installed on the bottom surface of the conductor holder (1). The mounting bolt includes a nut (201) and a screw (202). The screw (202) is threadedly connected to the PT support insulator (3). A bolt guard (5) is sleeved on the outside of the nut (201). A PT safety (4) is provided above the nut (201) and is vertically connected to the side surface of the conductor holder (1). The bolt protective cover (5) is made up of two halves joined together. The bolt protective cover (5) includes a metal base (7) and a protective cover insulating shell (6). The protective cover insulating shell (6) is fixedly connected to the outer wall of the metal base (7). The metal base (7) has a retaining plate (10) inside. One side of the retaining plate (10) is tightly attached to the nut (201). The other side of the retaining plate (10) is vertically connected to a telescopic rod (11). The other side of the telescopic rod (11) is vertically connected to the inner wall of the metal base (7) and can slide along the axial direction. A spring (12) is provided on the outer wall of the telescopic rod (11). One end of the spring (12) is connected to the retaining plate (10), and the other end of the spring (12) is connected to the inner wall of the metal base (7). The metal base (7) on one side is provided with a buckle device (8), and the metal base (7) on the other side is provided with a slot (9). The bolt guard (5) is spliced ​​together by the buckle device (8) and the slot (9).

2. The anti-breakthrough bolt protector tooling of claim 1, wherein: The protective cover insulating shell (6) is made of insulating material. The top surface of the protective cover insulating shell (6) has a double-layer structure and a vacuum layer (601) is formed in the middle.

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