Differential protection device for power distribution network

Abstract

The utility model discloses a differential protection device for a power distribution network, and relates to the technical field of power grid facilities, in particular to the differential protection device for the power distribution network, which comprises a device body, an adjusting bin is arranged on the back of the device body, a connecting shaft rod is arranged in the adjusting bin, and a transmission gear is arranged on the outer surface of the connecting shaft rod. A connecting rack is arranged on the outer surface of the transmission gear, a connecting plate is arranged at one end of the connecting rack, a connecting sliding rod is slidably connected into the connecting plate, one end of the connecting sliding rod is arranged on the inner wall of the adjusting bin, a limiting piece is arranged at one end of the connecting sliding rod, and an adjusting sliding groove is formed in the back of the device body. According to the differential protection device for the power distribution network, the transmission gear, the connecting rack, the connecting plate, the limiting clamping block, the positioning plate, the control ring, the limiting plate, the first spring, the limiting hole and the limiting column are arranged in a matched mode, so that the differential protection device for the power distribution network has the effect that the protection device can be conveniently and rapidly mounted and dismounted.

Description

Technical Field

[0001] This utility model relates to the field of power grid facilities technology, specifically to a differential protection device for distribution networks. Background Technology

[0002] Adaptive differential protection devices are mainly used in the distribution network field of power systems. The distribution network is a power system that transmits electrical energy from the transmission network to end users, including equipment such as substations, distribution transformers, and distribution lines. The stable operation of the distribution network is crucial to ensuring the reliability and security of power supply. It is mainly used to detect and protect differential faults in the power system. It determines whether a fault exists by monitoring the difference in current and phase difference, and quickly disconnects the faulty circuit when a fault occurs to protect the safe operation of equipment and system.

[0003] Most existing differential protection devices for distribution networks are assembled and disassembled using multiple screws, which is not very effective. Special tools are required to secure them firmly, making it impossible to quickly assemble and disassemble adaptive differential protection devices. In addition, the displays and control panels of most existing differential protection devices for distribution networks are exposed to the outside environment, making them susceptible to damage during use and impairing their practicality. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a differential protection device for power distribution networks, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a differential protection device for power distribution networks, comprising a device body, an adjustment chamber on the back of the device body, a connecting shaft inside the adjustment chamber, a transmission gear on the outer surface of the connecting shaft, a connecting rack on the outer surface of the transmission gear, a connecting plate at one end of the connecting rack, a connecting slide rod slidably connected inside the connecting plate, one end of the connecting slide rod being mounted on the inner wall of the adjustment chamber, a limit plate at one end of the connecting slide rod, an adjustment groove on the back of the device body, the connecting plate slidably connected inside the adjustment groove, a limit block at the end of the connecting plate away from the connecting slide rod, positioning plates at both ends of the connecting shaft, a control ring slidably connected inside the positioning plate, a limit plate at one end of the control ring, and the limit plate slidably connected to the outer surface of the connecting shaft.

[0008] Optionally, a first spring is provided on the outer surface of the limiting plate, with one end of the first spring away from the limiting plate disposed on the outer surface of the positioning plate, and the first spring is sleeved on the outer surface of the control ring.

[0009] Optionally, a plurality of limiting holes are formed on the two sides of the device body.

[0010] Optionally, a limiting column is arranged at the end of the limiting plate away from the first spring, and the position of the limiting column is matched with the position of the limiting hole.

[0011] Optionally, a connecting sliding groove is formed on the side of the device body, a connecting sliding block is slidably connected in the connecting sliding groove, and a protective cover is arranged on the outer surface of the connecting sliding block.

[0012] Optionally, an installation bin is formed in the protective cover, a fixing shaft is arranged in the installation bin, a control gear is rotatably connected to the outer surface of the fixing shaft, an adjusting rack is engaged with the outer surface of the control gear, one end of the adjusting rack is arranged on the inner wall of the installation bin, the other end of the adjusting rack is provided with a fixing plate, the fixing plate is arranged in the other protective cover, a limiting sliding rod is slidably connected in the fixing plate, one end of the limiting sliding rod is arranged on the inner wall of the installation bin, a second spring is arranged on the outer surface of the fixing plate, a positioning piece is arranged at the end of the second spring away from the fixing plate, and the positioning piece is arranged at the end of the limiting sliding rod.

[0013] Optionally, the number of the protective covers is two, the two protective covers are symmetrically arranged above and below each other, and the outer surface of the lower protective cover is provided with a control handle.

[0014] Optionally, a display and a control button are arranged on the outer surface of the device body.

[0015] The power distribution network differential protection device has the following beneficial effects:

[0016] 1. The power distribution network differential protection device has the effects of facilitating the quick installation and disassembly of the protection device, through the cooperation of the transmission gear, the connecting rack, the connecting plate, the limiting block, the positioning plate, the control ring, the limiting plate, the first spring, the limiting hole and the limiting column.

[0017] 2. The power distribution network differential protection device has the effects of improving the protection performance of the protection device and preventing the damage of the protection device, through the cooperation of the protective cover, the adjusting rack, the control gear, the second spring and the control handle. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 2 is a schematic view of the internal structure of the device body as viewed from the side;

[0019] Figure 2 FIG. 3 is a schematic view of the three-dimensional structure of the device body as viewed from the back;

[0020] Figure 3 FIG. 4 is a schematic view of the three-dimensional structure of the device body as viewed from the front.Figure 2 Enlarged structural schematic view of the middle A;

[0021] Figure 4 Internal structure schematic view of the protective shell from the side view of the utility model;

[0022] Figure 5 The utility model Figure 4 Enlarged structural schematic view of the middle B;

[0023] Figure 6 Front view structural schematic view of the device body of the utility model;

[0024] Figure 7 Three-dimensional structural schematic view of the utility model.

[0025] In the figure: 1, device body; 2, connecting shaft rod; 3, transmission gear; 4, connecting rack; 5, connecting plate; 6, connecting slide rod; 7, limit block; 8, control ring; 9, limit plate; 10, first spring; 11, limit hole; 12, connecting slide; 13, connecting slide block; 14, protective cover; 15, control gear; 16, adjusting rack; 17, fixed plate; 18, limit slide rod; 19, second spring; 20, control handle; 21, display; 22, control button. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0027] EMBODIMENT

[0028] The utility model provides a power distribution network differential protection device, including device body 1, the back of device body 1 is equipped with the adjusting bin, the inside of adjusting bin is provided with connecting axle rod 2, the outer surface of connecting axle rod 2 is provided with transmission gear 3, the outer surface of transmission gear 3 is provided with connecting rack 4, and one end of connecting rack 4 is provided with connecting plate 5, and the inside of connecting plate 5 is slidably connected with connecting slide rod 6, and one end of connecting slide rod 6 is arranged on the inner wall of adjusting bin, and one end of connecting slide rod 6 is provided with limiting sheet, the back of device body 1 is equipped with adjusting sliding slot, and connecting plate 5 is slidably connected in the inside of adjusting sliding slot, and the end of connecting plate 5 away from connecting slide rod 6 is provided with limiting block 7, and the both ends of connecting axle rod 2 are provided with positioning plate, and the inside of positioning plate is slidably connected with control ring 8, and one end of control ring 8 is provided with limiting plate 9, and limiting plate 9 is slidably connected on the outer surface of connecting axle rod 2, and the outer surface of limiting plate 9 is provided with first spring 10, and the end of first spring 10 away from limiting plate 9 is arranged on the outer surface of positioning plate, and first spring 10 is sleeved on the outer surface of control ring 8, and the both sides of device body 1 are equipped with limiting hole 11, and the number of limiting hole 11 is several, and evenly distributes on the both sides of device body 1, and the end of limiting plate 9 away from first spring 10 is provided with limiting column, and the position of limiting column is adapted to the position of limiting hole 11, and the side of device body 1 is equipped with connecting sliding slot 12, and connecting sliding slot 12 is slidably connected with connecting sliding block 13, and the outer surface of connecting sliding block 13 is provided with protective cover 14, and the inside of protective cover 14 is equipped with installation bin, and the inside of installation bin is provided with fixed shaft, and the outer surface of fixed shaft is rotatably connected with control gear 15, and the outer surface of control gear 15 is engaged with adjusting rack 16, and one end of adjusting rack 16 is arranged on the inner wall of installation bin, and the other end of adjusting rack 16 is provided with fixed plate 17, and fixed plate 17 is located in the inside of another protective cover 14, and the inside of fixed plate 17 is slidably connected with limiting slide rod 18, and one end of limiting slide rod 18 is arranged on the inner wall of installation bin, and the outer surface of fixed plate 17 is provided with second spring 19, and the end of second spring 19 away from fixed plate 17 is provided with positioning sheet, and the positioning sheet is arranged on one end of limiting slide rod 18, and the number of protective cover 14 is two, and they are symmetrical on each other, and the outer surface of lower protective cover 14 is provided with control handle 20, and the outer surface of device body 1 is provided with display 21 and control button 22.

[0029] In order to make the power distribution network differential protection device have the effect of protecting the device from being damaged, the device is provided with the adjusting bin, the connecting axle rod, the transmission gear, the connecting rack, the connecting plate, the connecting slide rod, the limiting block, the positioning plate, the control ring, the limiting plate, the first spring, the limiting hole, the limiting column, the connecting sliding slot, the connecting sliding block, the protective cover, the installation bin, the fixed shaft, the control gear, the adjusting rack, the fixed plate, the limiting slide rod, the second spring, the control handle, the display and the control button. Figures 1-6As shown, the device has the following structure: a transmission gear 3, a connecting rack 4, a connecting plate 5, a limiting block 7, a positioning plate, a control ring 8, a limiting plate 9, a first spring 10, a limiting hole 11, a limiting column, a protective cover 14, an adjusting rack 16, a control gear 15, a second spring 19 and a control handle 20 are arranged in cooperation. During use, the control ring 8 is pulled to pull the limiting plate 9, extrude the first spring 10, make the limiting column disengage from the limiting hole 11, then rotate the control ring 8 to drive the limiting plate 9 and the positioning plate to rotate, thereby drive the connecting shaft 2 and the transmission gear 3 to rotate, further make the connecting rack 4 and the connecting plate 5 slide along the connecting slide rod 6, make the limiting block 7 approach to the middle at the same time, then insert the limiting block 7 and the connecting plate 5 into the corresponding installation groove, rotate the control ring 8 reversely, make the limiting block 7 slide to the outside at the same time, make the limiting block 7 be clamped into the corresponding installation groove, release the control ring 8, under the elastic force of the first spring 10, make the limiting plate 9 reset, clamp the limiting column into the corresponding limiting hole 11, fix the position of the limiting plate 9, the control ring 8 and the positioning plate, further fix the position of the connecting shaft 2 and the transmission gear 3, under the action of the connecting rack 4, fix the position of the limiting block, complete the fixing of the differential protection device. When it is needed to view and modify the data of the differential protection device, slide the control handle 20, slide the lower protective cover 14 downward, under the action of the adjusting rack 16 and the control gear 15, make the upper protective cover 14 slide upward, extrude the second spring 19, thereby expose the display 21 and the control button 22 of the device body 1, view and modify the data, after completion, release the control handle 20, under the elastic force of the second spring 19, make the two protective covers 14 approach to each other, abut each other, complete the protection of the differential protection device, make the power distribution network differential protection device have the effects of convenient protection device fast installation and dismounting and make the power distribution network differential protection device have the effects of improving the protection performance of the protection device and preventing the damage of the protection device.

[0030] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A differential protection device for power distribution networks, comprising a device body, characterized in that: An adjustment chamber is provided on the back of the device body. A connecting shaft is installed inside the adjustment chamber. A transmission gear is installed on the outer surface of the connecting shaft. A connecting rack is installed on the outer surface of the transmission gear. A connecting plate is installed at one end of the connecting rack. A connecting slide rod is slidably connected inside the connecting plate. One end of the connecting slide rod is set on the inner wall of the adjustment chamber. A limit plate is installed at one end of the connecting slide rod. An adjustment groove is provided on the back of the device body. The connecting plate is slidably connected inside the adjustment groove. A limit block is installed at the end of the connecting plate away from the connecting slide rod. Positioning plates are installed at both ends of the connecting shaft. A control ring is slidably connected inside the positioning plate. A limit plate is installed at one end of the control ring. The limit plate is slidably connected to the outer surface of the connecting shaft.

2. The differential protection device for power distribution networks according to claim 1, characterized in that: The outer surface of the limiting plate is provided with a first spring, and the end of the first spring away from the limiting plate is provided on the outer surface of the positioning plate. The first spring is sleeved on the outer surface of the control ring.

3. The differential protection device for power distribution networks according to claim 1, characterized in that: The device body has several limiting holes on both sides, which are evenly distributed on both sides of the device body.

4. The differential protection device for power distribution networks according to claim 1, characterized in that: The end of the limiting plate away from the first spring is provided with a limiting post, and the position of the limiting post is adapted to the position of the limiting hole.

5. The differential protection device for power distribution networks according to claim 1, characterized in that: The device body has a connecting groove on its side, and a connecting slider is slidably connected inside the connecting groove. A protective cover is provided on the outer surface of the connecting slider.

6. The differential protection device for power distribution networks according to claim 5, characterized in that: The protective cover has an installation chamber inside, and a fixed shaft is installed inside the installation chamber. A control gear is rotatably connected to the outer surface of the fixed shaft. An adjusting rack is meshed on the outer surface of the control gear. One end of the adjusting rack is set on the inner wall of the installation chamber, and a fixed plate is set on the other end of the adjusting rack. The fixed plate is located inside another protective cover. A limit slide rod is slidably connected inside the fixed plate. One end of the limit slide rod is set on the inner wall of the installation chamber. A second spring is set on the outer surface of the fixed plate. A positioning piece is set on the end of the second spring away from the fixed plate. The positioning piece is set on one end of the limit slide rod.

7. The differential protection device for distribution networks according to claim 5, characterized in that: There are two protective covers, which are symmetrical about each other, and the outer surface of the lower protective cover is provided with a control handle.

8. The differential protection device for distribution networks according to claim 1, characterized in that: The outer surface of the device body is equipped with a display and control buttons.

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