Power distribution network single-phase earth fault line selection device convenient to mount and dismount

Abstract

The utility model relates to a power distribution network single-phase earth fault line selection device convenient to mount and dismount, which belongs to the technical field of power system equipment and comprises a mounting shell, a surface patch and a control circuit board. The mounting shell comprises a first shell and a second shell which are detachably connected with each other and wrap the control circuit board inside; the first shell comprises a top plate, a side plate I and a side plate II which are vertically connected in pairs; the second shell comprises a bottom plate, a third side plate and a fourth side plate which are vertically connected in pairs, the third side plate is arranged opposite to the first side plate, the fourth side plate is arranged opposite to the second side plate, and the first side plate is detachably connected with the bottom plate; the two opposite side faces and the bottom face of the installation shell are each provided with an installation hole used for being connected with a connecting piece. The utility model has the advantages of convenient installation and strong applicability, and can realize more effective installation in different installation environments.

Description

Technical Field

[0001] The utility model relates to a single-phase grounding fault line selection device for a power distribution network which is easy to install and disassemble, and belongs to the technical field of power system equipment. Background Art

[0002] A low-current grounding system (i.e., a system with an ineffectively grounded neutral point) refers to a power system in which the neutral point is ungrounded or grounded via an arc suppression coil. In the event of a single-phase grounding fault, the fault current in a low-current grounding system is low, allowing for a period of operation with the fault (electricity regulations allow for up to two hours of operation). However, a single-phase grounding fault will cause the voltage of the normal phase to rise, overvoltage causing insulation damage and even insulation breakdown, leading to further fault expansion. Power supply and distribution system failure statistics show that the probability of single-phase grounding faults exceeds 80%. Therefore, quickly identifying the faulty line with single-phase grounding is crucial to the safe operation of the power supply and distribution system.

[0003] Single-phase ground fault current is affected by multiple factors, including network configuration, ground transition resistance, ground fault location, transformer measurement errors, and the environment at the fault site. There's no unified method for setting thresholds. Setting the threshold too low can easily lead to false trips, while setting it too low can easily lead to false trips. Currently, single-phase ground fault protection for medium-voltage distribution networks with ungrounded neutral points, grounded via arc suppression coils, or grounded via low-resistance resistors typically uses a fixed value (threshold) setting.

[0004] The intelligent line selection device for single-phase grounding fault in distribution network is installed in urban distribution network power station and is used for judging and indicating single-phase grounding fault in distribution network outgoing lines. It is an intelligent distribution network equipment integrating real-time monitoring and alarm of distribution network and fault section location.

[0005] At present, the installation structure of the existing distribution network single-phase grounding fault intelligent line selection device is relatively simple, and can only be used for installation in one direction, with poor adaptability. Sometimes there are problems such as installation difficulty and poor installation adaptability. In addition, the existing distribution network single-phase grounding fault intelligent line selection device is usually fitted with a surface sticker on the outer shell. If the distribution network single-phase grounding fault intelligent line selection device fails, it is necessary to tear off the surface sticker first, and then remove the bolts connecting the shell. This not only has low disassembly efficiency, but also the surface sticker cannot be completely torn off.

[0006] A multi-criteria fusion fault line selection device disclosed in the Chinese utility model patent with publication number CN219122258U includes a mounting seat, the top of the mounting seat is rotatably connected to a placement rack, the top of the placement rack is fixedly connected to the mounting rack, the top of the mounting rack is installed with a cover structure, the inside of the cover structure is fixedly connected to a support structure, the top of the support structure is installed with a line selection machine body, the bottom end of the inner wall of the placement rack is fixedly connected to a plurality of electric telescopic rods, the top end of the electric telescopic rods is slidably inserted into the bottom end of the inner wall of the placement rack, and the top ends of the plurality of electric telescopic rods are fixedly connected to a top plate, which is located below the support structure and matches the support structure.

[0007] The above reference example uses the installation base and the placement rack to directly place the equipment on the external bracket when in use. However, for places where the bracket cannot be placed, such as the switch cabinet and the ring network cabinet instrument room, there is still the problem of difficult installation, so improvement is urgently needed. Utility Model Content

[0008] In order to overcome the above shortcomings of the prior art, the utility model designs a single-phase grounding fault line selection device for a distribution network that is easy to install and disassemble. It is easy to install, has strong applicability, and can achieve more effective installation in different installation environments.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A single-phase ground fault line selection device for a power distribution network that is easy to install and disassemble, comprising a mounting shell, a surface mount, and a control circuit board. The control circuit board is disposed inside the mounting shell. The mounting shell comprises a first shell and a second shell that are detachably connected to each other and enclose the control circuit board.

[0011] The first shell includes a top plate, a side plate 1 and a side plate 2 that are vertically connected to each other in pairs, the surface is fitted on the top of the top plate, a rectangular slot is provided at the top of the top plate away from the corner of the side plate 1 and the side plate 2, a bent plate that is bent downward is fixedly connected to the side of the rectangular slot away from the side plate 1, and a mounting slot is provided on the bent plate;

[0012] The second shell includes a bottom plate, a side plate three, and a side plate four, which are connected perpendicularly to each other in pairs. The side plate three is arranged opposite to the side plate one, and the side plate four is arranged opposite to the side plate two. A clamping plate is integrally fixedly connected to the inner side of the side plate three, and the clamping plate is detachably engaged with the mounting slot. The side plate one is detachably connected to the bottom plate.

[0013] The two opposite side surfaces and the bottom surface of the installation shell are both provided with installation holes for connecting the connecting parts.

[0014] Furthermore, a plurality of indicator lights are arranged horizontally on the top of the control circuit board, and each indicator light is correspondingly provided with a light guide column, and the top of the light guide column passes through the first shell and the surface patch in sequence.

[0015] Furthermore, the control circuit board is provided with a plurality of through holes, and the top of the second shell is provided with a plurality of screw posts corresponding to each through hole. The control circuit board is locked on the second shell by a plurality of screws passing through the through holes and threadedly connected to the screw posts.

[0016] Furthermore, the side panel 1 is provided with a plurality of mounting holes 1, and the side of the bottom plate is provided with mounting holes 2 corresponding to the mounting holes one by one, and the mounting holes 1 and the mounting holes 2 are connected by bolts.

[0017] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0018] 1. The utility model changes the existing front bolt connection mode to a side connection through the detachable connection between the card plate and the installation slot. When disassembly is required, there is no need to tear off the bottom sticker. It is only necessary to first disassemble the connection between the side panel and the bottom plate, and then withdraw the card plate from the installation slot. There is no need to damage the surface sticker, which saves the step of replacing the surface sticker and improves the loading and unloading efficiency. At the same time, during installation, it is only necessary to align the card plate with the installation slot to connect the first shell and the second shell, which can achieve quick installation and improve the installation efficiency.

[0019] 2. During the actual installation process, the operator can select appropriate connectors for installation according to the specific conditions of the switch cabinet, ring network cabinet instrument room, etc., thereby improving the adaptability of the installation. At the same time, by setting mounting holes at multiple positions on the two opposite sides and bottom of the second shell, the operator can select a suitable installation position to adapt to the corresponding installation environment. By selecting different mounting holes, the installation posture of the mounting shell can be changed, thereby achieving effective avoidance of obstacles and achieving more effective installation corresponding to different installation environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a top view of the utility model;

[0021] Figure 2 It is a bottom view of the utility model;

[0022] Figure 3 It is a three-dimensional structural diagram of the utility model;

[0023] Figure 4 It is an exploded view of the present invention from the first perspective;

[0024] Figure 5 yes Figure 4A schematic diagram of the local enlarged structure at A;

[0025] Figure 6 It is an exploded view of the second perspective of the present invention;

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the first shell of the utility model.

[0027] The figures are marked as follows: 1. Mounting shell; 11. First shell; 111. Through hole; 112. Rectangular slot; 113. Bending plate; 114. Mounting slot; 115. Mounting sleeve hole one; 116. Top plate; 117. Side panel one; 118. Side panel two; 12. Surface sticker; 13. Light guide column; 14. Control circuit board; 141. Indicator light; 15. Second shell; 151. Card; 152. Mounting sleeve hole two; 153. Bottom plate; 154. Side panel three; 155. Side panel four; 2. Connector; 21. Mounting bracket; 22. Slide rail. DETAILED DESCRIPTION

[0028] The present invention will be described in more detail below with reference to the embodiments.

[0029] See also Figures 1 to 7 The single-phase grounding fault line selection device for the distribution network of this embodiment, which is easy to install and disassemble, includes a mounting shell 1, a surface sticker 12 and a control circuit board 14. The control circuit board 14 is arranged inside the mounting shell 1. The mounting shell 1 includes a first shell 11 and a second shell 15 that are detachably connected to each other and wrap the control circuit board 14 inside. In this embodiment, the first shell 11 and the second shell 15 are spliced ​​together to form a rectangular frame structure, and the control circuit board 14 is arranged inside the rectangular frame.

[0030] See also Figure 4 、 Figure 5 and Figure 6 The first shell 11 includes a top plate 116, a side panel 117 and a side panel 2 118 that are vertically connected to each other in pairs. The surface sticker 12 is fitted on the top of the top plate 116. A rectangular groove 112 is provided at the corner of the top of the top plate 116 away from the side panel 1 117 and the side panel 2 118. A downwardly bent bending plate 113 is fixedly connected to the side of the rectangular groove 112 away from the side panel 1 117. The bending plate 113 is provided with a mounting slot 114.

[0031] See also Figure 3 and Figure 7 The second shell 15 includes a bottom plate 153, a side panel 154 and a side panel 155 that are vertically connected to each other in pairs. The side panel 154 is arranged opposite to the side panel 1 117, and the side panel 155 is arranged opposite to the side panel 2 118. The top plate 116, the bottom plate 153, the side panel 1 117, the side panel 2 118, the side panel 154 and the side panel 155 together constitute a rectangular frame.

[0032] In particular, a clamping plate 151 is integrally fixedly connected to the inner side of the side panel three 154, and the clamping plate 151 is detachably clamped to the mounting slot 114. The side panel one 117 is detachably connected to the bottom plate 153. Specifically, three mounting sleeve holes 115 are provided on the side panel one 117, and mounting sleeve holes 2 152 corresponding to each mounting sleeve hole 115 are provided on the side of the bottom plate 153. The mounting sleeve hole 115 and the mounting sleeve hole 2 152 are connected by bolts.

[0033] It can be seen from the above description that through the detachable connection between the card plate 151 and the mounting slot 114, the existing front bolt connection is changed to a side connection. When it needs to be disassembled, there is no need to tear off the surface sticker 12. You only need to first disassemble the connection between the side panel 117 and the bottom plate 153, and then withdraw the card plate 151 from the mounting slot 114. There is no need to damage the surface sticker 12, which eliminates the step of replacing the surface sticker 12 and improves the loading and unloading efficiency. At the same time, during installation, you only need to align the card plate 151 with the mounting slot 114 to connect the first shell 11 and the second shell 15, which can achieve quick installation and improve installation efficiency.

[0034] See also Figure 1 、 Figure 2 and Figure 3 The two opposite side surfaces and the bottom surface of the mounting shell 1 are provided with mounting holes for connecting the connector 2. Specifically, the connector 2 is a mounting bracket 21 or a slide rail 22. During the actual installation process, the operator can select a suitable connector 2 for installation according to the specific conditions of the switch cabinet, ring network cabinet instrument room, etc. By providing mounting holes at multiple positions on the two opposite side surfaces and the bottom surface of the second shell 15, the operator can select a suitable installation position to adapt to the corresponding installation environment, thereby achieving more effective installation corresponding to different installation environments.

[0035] Further, see Figure 3 、 Figure 4 and Figure 6 Three indicator lights 141 are arranged horizontally at the top of the control circuit board 14. Each indicator light 141 is correspondingly provided with a light guide column 13. The top of the light guide column 13 is sequentially passed through the first shell 11 and the surface sticker 12. A through hole 111 corresponding to each light guide column 13 is opened on the top plate 116.

[0036] Furthermore, the control circuit board 14 is provided with a plurality of through holes, and the top of the second shell 15 is provided with a plurality of screw posts corresponding to each through hole. The control circuit board 14 is locked on the second shell 15 by a plurality of screws passing through the through holes and threadedly connected to the screw posts.

[0037] The working principle of the present utility model is as follows: during installation, the control circuit board 14 is first fastened to the second shell 15 by screws, and then the card plate 151 is aligned with the mounting slot 114 and snapped in place. At the same time, the card plate 151 and the mounting slot 114 are aligned and snapped in place, and the mounting hole 115 and the mounting hole 2 152 also correspond one to one. Finally, the mounting hole 115 and the mounting hole 2 152 are connected by bolts to complete the installation of the mounting shell 1.

[0038] When in use, select a suitable installation location, and select the installation bracket 21 or the slide rail 22 as needed to install the installation shell 1 in a switch cabinet or a ring network cabinet instrument room or other locations.

[0039] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0040] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0041] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

Claims

1. A single-phase ground fault line selection device for a power distribution network that is easy to install and disassemble, comprising a mounting shell (1), a surface sticker (12), and a control circuit board (14), wherein the control circuit board (14) is arranged inside the mounting shell (1), and is characterized in that: The mounting shell (1) comprises a first shell (11) and a second shell (15) which are detachably connected to each other and enclose the control circuit board (14) inside. The first shell (11) comprises a top plate (116), a side plate 1 (117) and a side plate 2 (118) which are vertically connected to each other in pairs, the surface sticker (12) is fitted on the top of the top plate (116), a rectangular slot (112) is provided at the top of the top plate (116) away from the corner of the side plate 1 (117) and the side plate 2 (118), a side of the rectangular slot (112) away from the side plate 1 (117) is integrally fixedly connected with a downwardly bent bending plate (113), and a mounting slot (114) is provided on the bending plate (113); The second shell (15) includes a bottom plate (153), a side plate three (154) and a side plate four (155) which are vertically connected to each other in pairs, the side plate three (154) is arranged opposite to the side plate one (117), the side plate four (155) is arranged opposite to the side plate two (118), and the inner side of the side plate three (154) is integrally fixedly connected with a card plate (151), the card plate (151) is detachably connected to the installation card slot (114), and the side plate one (117) is detachably connected to the bottom plate (153); The two opposite side surfaces and the bottom surface of the installation shell (1) are both provided with installation holes for connecting the connecting member (2).

2. The single-phase ground fault line selection device for a power distribution network that is easy to install and disassemble according to claim 1 is characterized in that: A plurality of indicator lights (141) are arranged transversely on the top of the control circuit board (14), and each indicator light (141) is correspondingly provided with a light guide column (13), and the top of the light guide column (13) sequentially passes through the first shell (11) and the surface sticker (12).

3. The single-phase ground fault line selection device for a power distribution network that is easy to install and disassemble according to claim 1 is characterized in that: The control circuit board (14) is provided with a plurality of through holes, and the top of the second shell (15) is provided with a plurality of screw connection posts corresponding to the through holes one by one, and the control circuit board (14) is locked on the second shell (15) by a plurality of screws passing through the through holes and being threadedly connected to the screw connection posts.

4. The single-phase ground fault line selection device for a power distribution network that is easy to install and disassemble according to claim 1 is characterized in that: The side plate (117) is provided with a plurality of mounting sleeve holes (115), and the side surface of the bottom plate (153) is provided with mounting sleeve holes (152) corresponding to each mounting sleeve hole (115) one by one, and the mounting sleeve holes (115) and the mounting sleeve holes (152) are connected by bolts.

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