Single-phase earth fault line selection device

Abstract

The utility model discloses a single-phase earth fault line selection device, which relates to the field of earth fault line selection devices and comprises a low-current fault line selection device which can be used in an overlapped mode from bottom to top, and a pair of supporting legs are symmetrically fixed on the lower surface of the low-current fault line selection device. The upper surface of the low-current fault line selector is fixedly connected with a pair of first positioning columns and second positioning columns from front to back, the surfaces of the supporting legs are provided with alignment channels capable of containing the first positioning columns and the second positioning columns, and the front portions of the alignment channels are provided with limiting notches. According to the utility model, the low-current fault line selectors which can be used in an overlapped manner are adopted, and a certain heat dissipation gap exists between the upper low-current fault line selector and the lower low-current fault line selector, so that the heat dissipation efficiency of the plurality of low-current fault line selectors during operation is improved. Moreover, through the connection of the positioning ball head and the limiting notch, the supporting leg is limited, the stability of the supporting leg and the small current fault line selector above the supporting leg can be guaranteed, and the phenomena of deviation and shaking of the small current fault line selector are avoided.

Description

Technical Field

[0001] The utility model relates to the field of grounding line selection devices, and particularly relates to a single-phase grounding fault line selection device. Background Art

[0002] During the operation of the distribution network, single-phase short-circuit grounding faults occur frequently. If no effective measures are taken, it is extremely easy to cause phase-to-phase short circuits, expand the accidents, and affect the power supply quality. When a single-phase grounding short-circuit fault occurs in a small-current grounding system, the short-circuit current is small, and the protection device does not need to trip immediately. The system allows to continue operating for 1 - 2 hours under the fault condition, thereby improving the reliability of the system operation. However, it is necessary to quickly identify the short-circuit line in order to take corresponding countermeasures to remove the fault and restore the normal operation of the system. This raises the problem of single-phase grounding fault line selection for the small-current grounding system.

[0003] The small-current grounding line selection device is a protection device used in the power industry. This device is applicable to single-phase grounding line selection for 3KV - 66KV neutral point ungrounded or neutral point grounded through a resistor or arc suppression coil systems, and is used in the power supply systems of substations, power plants, hydropower stations, and large industrial and mining enterprises such as chemical industry, oil extraction, metallurgy, coal, and railway, and can indicate the line where a single-phase grounding fault occurs.

[0004] For the existing small-current grounding line selection devices, small-current grounding line selection devices need to be equipped according to different power equipment. During the operation of multiple small-current grounding line selection devices, in order to facilitate management, debugging by workers, and save installation space, most of them adopt an overlapping distribution connection method. However, during the operation of the small-current grounding line selection device, heat is easily accumulated by itself. If used in an overlapping manner for a long time, the surfaces of the devices are in contact with each other, and the heat dissipation is slow, which is likely to cause overheating. Moreover, for the stacked devices, the stability is not guaranteed, and the device located above is likely to shake and shift under the action of external forces. Summary of the Utility Model

[0005] In view of the above problems, the present application provides a single-phase grounding fault line selection device.

[0006] To achieve the above object, the present application provides the following technical solution: A single-phase grounding fault line selection device includes small-current fault line selectors that can be stacked and used from bottom to top. A pair of supporting feet are symmetrically and fixedly arranged on the lower surface of each small-current fault line selector, and a pair of first positioning columns and second positioning columns are fixedly connected to the upper surface of each small-current fault line selector from front to back. A positioning channel capable of accommodating the first positioning column and the second positioning column is formed on the surface of the supporting foot, and a limiting notch is formed in front of the positioning channel.

[0007] On the outer surface of the first positioning post and arranged upwardly, there is a first limiting block. At the bottom end of the first limiting block, there is a liftable follower rod. The bottom end of the follower rod is fixedly connected to a positioning ball head that can lift and lower synchronously with it. When the first positioning post and the second positioning post are located inside the support leg, the positioning ball head is located inside the limiting notch.

[0008] Furthermore, on the outer surface of the first positioning post, a second limiting block is installed. The second limiting block is located directly above the positioning ball head, and a through hole for accommodating the movement of the follower rod is provided on the surface of the second limiting block.

[0009] Furthermore, at the bottom end of the first limiting block, first guiding rods are fixedly connected. The bottom ends of the first guiding rods are connected to second guiding rods through rotating shafts. The ends of the second guiding rods away from the rotating shafts are all located inside the follower rod. When the follower rod rotates, it can force the second guiding rod to rotate around the rotating shaft.

[0010] Furthermore, a compression spring is fixed on the lower surface of the first limiting block. The compression spring is installed on the surface of the flange at the top end of the follower rod. When the follower rod rises, the compression spring is compressed and contracted.

[0011] Furthermore, the front ends of a pair of support legs located below the same small current fault line selector are connected through a handle.

[0012] In summary, the technical effects and advantages of the present utility model:

[0013] The present utility model adopts small current fault line selectors that can be stacked and used, and is equipped with support legs and a first positioning post and a second positioning post adapted to the support legs. In the stacked state, the connection between the support legs and the first positioning post and the second positioning post provides a supporting force for the small current fault line selector above. There is a certain heat dissipation gap between the upper and lower small current fault line selectors, improving the heat dissipation efficiency during the operation of multiple small current fault line selectors. Moreover, through the connection between the positioning ball head and the limiting notch, the support legs are limited, ensuring the stability of the support legs and the small current fault line selector above, and preventing the small current fault line selector from shifting or shaking. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the present utility model.

[0016] Figure 2 This is a schematic diagram of the second perspective structure of the present utility model.

[0017] Figure 3 For the present utility model Figure 2 The enlarged schematic diagram of the structure at position A.

[0018] Figure 4 This is a schematic diagram of the structure when the small current fault line selector of the present utility model is used alone.

[0019] Figure 5 For the present utility model Figure 4 The enlarged schematic diagram of the structure at position A.

[0020] In the figure: 1. Small current fault line selector; 11. Support feet; 111. Alignment channel; 112. Limit notch; 12. First positioning post; 13. Second positioning post; 2. Handle; 3. First limit block; 4. Follow-up rod; 5. Positioning ball head; 6. Second limit block; 7. First guide rod; 8. Second guide rod; 9. Pressure spring. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment: Refer to Figure 1 , Figure 2 As shown in a single-phase grounding fault line selection device, which includes a small current fault line selector 1 that can be stacked and used from bottom to top. A pair of support feet 11 are symmetrically fixed on the lower surface of the small current fault line selector 1, and a pair of first positioning posts 12 and second positioning posts 13 are fixedly connected from front to back on the upper surface of the small current fault line selector 1. The alignment channels 111 that can accommodate the first positioning posts 12 and the second positioning posts 13 are provided on the surface of the support feet 11, and the limit notches 112 are provided in front of the alignment channels 111. When the small current fault line selectors 1 are stacked and used from bottom to top, the support feet 11 installed on the upper small current fault line selector 1 slide to the outside of the first positioning posts 12 and the second positioning posts 13, providing a supporting force for the upper small current fault line selector 1. There is a certain heat dissipation gap between the upper and lower small current fault line selectors 1, improving the heat dissipation efficiency during the operation of multiple small current fault line selectors 1.

[0023] The outer surface of the first positioning column 12 is provided with a limiting block 3 on the upper side, and the bottom end of the limiting block 3 is provided with a follower rod 4 that can be raised and lowered, and the bottom end of the follower rod 4 is fixedly connected with a positioning ball head 5 that can be raised and lowered synchronously therewith, and when the first positioning column 12 and the second positioning column 13 are located on the inner side of the support leg 11, the positioning ball head 5 is located on the inner side of the limiting notch 112. The support leg 11 has a limiting effect, which can ensure the stability of the support leg 11 and the small current fault line selector 1 above it, and avoid the small current fault line selector 1 from deflecting and shaking.

[0024] like Figure 2 , Figure 3 As shown, the outer surface of the first positioning column 12 is installed with a limiting block 6, which is located directly above the positioning ball head 5, and the surface of the limiting block 6 is provided with a through hole that can accommodate the movement of the follower rod 4. When the support leg 11 moves, under the pressure of the support leg 11, the positioning ball head 5 and the follower rod 4 may deflect at a certain angle and then move upward, leaving a space for the support leg 11 to slide smoothly, and a certain gap is left between the through hole on the surface of the limiting block 6 and the follower rod 4, which can accommodate the deflection and lifting movement of the follower rod 4.

[0025] like Figure 4 , Figure 5 As shown, the bottom end of the limit block 1 3 is fixedly connected to the first guide rod 7, and the bottom end of the first guide rod 7 is connected to the second guide rod 8 through the rotating shaft. The end of the second guide rod 8 away from the rotating shaft is located on the inner side of the follower rod 4. When the support foot 11 moves, under the pressure of the support foot 11, the follower rod 4 may deflect at a certain angle and then rise. When the follower rod 4 deflects to a certain angle, it can force the second guide rod 8 to rotate around the rotating shaft. It is worth mentioning that there is a certain gap between the inner side of the follower rod 4 and the second guide rod 8, which can accommodate the follower rod 4 to deflect, rise to a certain angle, and then force the second guide rod 8 to rotate, so as to adapt to the deflection movement of the follower rod 4 and the positioning ball head 5 under pressure.

[0026] like Figure 3 , Figure 5 As shown, a pressure spring 9 is fixed to the lower surface of the limit block 3, and the pressure spring 9 is installed on the flange position surface of the top end of the follower rod 4. When the support foot 11 moves and squeezes the positioning ball head 5 to move, the follower rod 4 moves upward with the rising movement of the positioning ball head 5, and the pressure spring 9 is squeezed and contracted, leaving a space for the support foot 11 to slide. When the support foot 11 slides to the specified position, under the elastic reset potential energy of the pressure spring 9, the follower rod 4 and the positioning ball head 5 can be restored to their original positions, and the positioning ball head 5 falls into the inner side of the limiting notch 112, so as to achieve the purpose of limiting the sliding of the support foot 11.

[0027] like Figure 4As shown, the front ends of a pair of feet 11 located below the same small current fault line selector 1 are connected by a handle 2. By controlling the handle 2, the small current fault line selector 1 and a pair of feet 11 below it can be synchronously moved to achieve the purpose of transferring the small current fault line selector 1.

[0028] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A single-phase ground fault line selection device, characterized in that: The invention comprises a small current fault line selector (1) which can be stacked from bottom to bottom for use, wherein a pair of legs (11) are symmetrically fixed on the lower surface of the small current fault line selector (1), and a pair of first positioning columns (12) and second positioning columns (13) are fixedly connected on the upper surface of the small current fault line selector (1) from front to back, and a positioning channel (111) which can accommodate the first positioning column (12) and the second positioning column (13) is provided on the surface of the legs (11), and a limited position notch (112) is provided in front of the positioning channel (111); A limiting block (3) is arranged on the outer surface of the first positioning column (12) and close to the upper side. A follower rod (4) that can be raised and lowered is arranged at the bottom end of the limit block (3). A positioning ball head (5) that can be raised and lowered synchronously with the follower rod (4) is fixedly connected to the bottom end of the follower rod (4). When the first positioning column (12) and the second positioning column (13) are located on the inner side of the support foot (11), the positioning ball head (5) is located on the inner side of the limiting notch (112).

2. The single-phase ground fault line selection device according to claim 1 is characterized in that: A second limiting block (6) is installed on the outer surface of the first positioning column (12), the second limiting block (6) is located directly above the positioning ball head (5), and a through hole capable of accommodating the movement of the follower rod (4) is provided on the surface of the second limiting block (6).

3. The single-phase ground fault line selection device according to claim 2 is characterized in that: The bottom end of the limit block 1 (3) is fixedly connected to a first guide rod (7), the bottom end of the first guide rod (7) is connected to a second guide rod (8) via a rotating shaft, and the end of the second guide rod (8) away from the rotating shaft is located on the inner side of the follower rod (4), and when the follower rod (4) rotates, the second guide rod (8) can be forced to rotate around the rotating shaft.

4. The single-phase ground fault line selection device according to claim 3 is characterized in that: A pressure spring (9) is fixed on the lower surface of the limit block 1 (3), and the pressure spring (9) is installed on the flange position surface at the top end of the follower rod (4). When the follower rod (4) rises, the pressure spring (9) is squeezed and contracted.

5. The single-phase ground fault line selection device according to claim 1 is characterized in that: The front ends of a pair of legs (11) located below the same small current fault line selector (1) are connected via a handle (2).

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