Zero sequence mutual inductor fixing device and ring main unit

Abstract

The utility model relates to the technical field of electrical equipment, and discloses a fixing device of a zero sequence mutual inductor and a ring main unit, and the fixing device of the zero sequence mutual inductor comprises a cable fixing assembly with an avoiding space, a cable clamp capable of clamping and fixing a cable, and a mutual inductor fixing assembly used for installing the zero sequence mutual inductor. The cable clamp is installed in the middle of the cable fixing assembly and has a certain adjusting freedom degree in the first direction, the cable clamp can better adapt to cable clamps of different specifications, field installation is convenient, and the assembling efficiency is further improved. In order to correspondingly arrange the zero-sequence mutual inductor and the avoiding space, the mutual inductor fixing assembly is adjustably connected to the cable fixing assembly in the second direction, so that adjustable matching of the zero-sequence mutual inductor and the cable clamp is achieved, the effect that the cable clamp is centered in a center hole of the zero-sequence mutual inductor is achieved, and a cable can conveniently penetrate through the zero-sequence mutual inductor. The ring main unit applying the fixing device of the zero sequence mutual inductor is simple in structure and convenient to assemble, saves the space of a cable chamber, and facilitates assembly of cables and other components.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a fixing device of a zero-sequence mutual inductor and a ring network cabinet. Background Art

[0002] The ring main unit is a group of electrical transmission and distribution equipment installed in a metal or non-metallic insulating cabinet or made into an assembled interval ring network power supply. It has the advantages of simple structure, small size, low price, improved power supply parameters and power supply safety. In order to ensure the stability of the ring main unit operation system, zero-sequence transformers are often installed at the positions of the incoming and outgoing lines in the ring main unit. The zero-sequence transformer can be used in conjunction with the relay protection device or signal when the power system generates a zero-sequence grounding current, so that the device components can be activated to achieve protection or monitoring. Due to the small size of the ring main unit, its internal installation space is very limited.

[0003] Therefore, a reasonable fixture for installing the zero-sequence transformer is particularly important. Traditional fixtures mostly use a limit structure design. When the installation position of the zero-sequence transformer is fixed at a certain position, it cannot be moved flexibly. If special circumstances occur and replacement or change is required, it is necessary to re-drill and fix. The operation is very cumbersome. In addition, due to the small space, the cable may not be able to pass through the current transformer normally due to insufficient suitable position. The design defects of the fixture will also make it difficult to install components inside the ring network cabinet, which is labor-consuming and time-consuming. Utility Model Content

[0004] The purpose of the utility model is to provide a fixing device and a ring network cabinet for a zero-sequence transformer, which can flexibly adjust the installation position of the cable and the current transformer to meet the installation requirements of cables of different specifications; it is convenient to keep the cable able to pass through the through hole of the current transformer in the center; it has a simple structure, effectively saves space, and can also facilitate the assembly of other components.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The fixing device of the zero-sequence transformer comprises:

[0007] A cable fixing assembly, wherein the cable fixing assembly has an escape space, and the escape space is used for passing the cable;

[0008] A cable clamp, the cable clamp is centrally disposed on the cable fixing assembly, the cable clamp is adjustably connected to the cable fixing assembly along a first direction, and the cable clamp is used to clamp the cable placed in the avoidance space;

[0009] A transformer fixing component is used to fix a zero-sequence transformer, and the transformer fixing component is adjustably connected to the cable fixing component along a second direction so that the zero-sequence transformer is arranged corresponding to the avoidance space.

[0010] As a preferred technical solution for the fixing device of the zero-sequence transformer, the cable fixing assembly includes two cable fixing beams, the two cable fixing beams are arranged in parallel and spaced apart along the second direction and extend along the first direction, the avoidance space is formed between the two cable fixing beams, and at least one cable clamp is arranged on each of the cable fixing beams.

[0011] As a preferred technical solution for the fixing device of the zero-sequence transformer, the cable clamps on the two cable fixing beams are staggered.

[0012] As a preferred technical solution for the fixing device of the zero-sequence transformer, the cable fixing assembly is provided with a first oblong hole, the first oblong hole extends along the first direction, and the cable clamp is provided with a first connecting piece, the first connecting piece passes through the first oblong hole and is adjustably connected to the cable fixing assembly.

[0013] As a preferred technical solution for the fixing device of the zero-sequence transformer, the transformer fixing assembly includes two transformer fixing beams, the two transformer fixing beams are arranged in parallel and spaced apart along the first direction and extend along the second direction, the two transformer fixing beams are respectively used to fix the two ends of the zero-sequence transformer, and the two transformer fixing beams are respectively connected to the cable fixing assembly and placed on both sides of the avoidance space in the first direction.

[0014] As a preferred technical solution for the fixing device of the zero-sequence transformer, the transformer fixing assembly is provided with a second oblong hole, the second oblong hole extends along the second direction, the upper end of the cable fixing assembly is provided with a mounting flange, the mounting flange is provided with a second connecting piece, and the second connecting piece passes through the second oblong hole and is adjustably connected to the transformer fixing assembly.

[0015] As a preferred technical solution for the fixing device of the zero-sequence transformer, the second connecting member includes a rivet nut and a stud, the rivet nut is riveted to the mounting flange, and one end of the stud is penetrated by the second oblong hole and is screwed to the rivet nut.

[0016] As a preferred technical solution for the fixing device of the zero-sequence transformer, the fixing device of the zero-sequence transformer also includes at least two integral fixing frames, which are connected to the inner wall of the cable chamber, and the two ends of the cable fixing assembly are respectively connected to the corresponding integral fixing frames in a height direction so as to be adjustably connected.

[0017] As a preferred technical solution for the fixing device of the zero-sequence transformer, the integral fixing frame is provided with a third oblong hole, the third oblong hole extends along the height direction, and the cable fixing assembly is provided with a third connecting piece, and the third connecting piece passes through the third oblong hole and is adjustably connected to the integral fixing frame.

[0018] A ring main unit comprises a fixing device for a zero-sequence transformer as described in any one of the above items, the ring main unit also comprising a cabinet body, a cable chamber is arranged in the cabinet body, and the fixing device for the zero-sequence transformer is arranged in the cable chamber.

[0019] Beneficial effects of the utility model:

[0020] The fixing device of the zero-sequence transformer provided by the utility model is suitable for the installation scenario of the cable and the zero-sequence transformer in the ring network cabinet, and includes a cable fixing component, a cable clamp and a transformer fixing component. The cable fixing component has an avoidance space for the cable to be passed through; the cable clamp is centrally installed on the cable fixing component and has a certain degree of adjustment freedom along the first direction, and is used to clamp the cable placed in the avoidance space, which can better adapt to the installation requirements of cable clamps of different specifications, facilitate on-site installation, and further improve the assembly efficiency; at the same time, in order to make the zero-sequence transformer installed on the transformer fixing component correspond to the avoidance space, the transformer fixing component is adjustably connected to the cable fixing component along the second direction. Under the premise of ensuring the installation strength, the adjustable installation of the zero-sequence transformer and the cable clamp is realized, and the effect of the cable clamp being centered in the through-hole of the zero-sequence transformer can be achieved, which is convenient for the cable to pass through the zero-sequence transformer.

[0021] The ring network cabinet provided by the utility model installs the fixing device of the zero-sequence transformer in the cable room, has a simple structure and is easy to assemble. The zero-sequence transformer and the cable clamp are accurately installed in the position through the adjustable and movable cable clamp and the transformer fixing component, thereby saving the space in the cable room and facilitating the assembly of cables and other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the assembly of a fixing device of a zero-sequence mutual inductor and a zero-sequence mutual inductor provided in a specific embodiment of the utility model;

[0023] Figure 2 It is a structural schematic diagram of a fixing device for a zero-sequence mutual inductor provided in a specific embodiment of the utility model;

[0024] Figure 3 It is a structural schematic diagram of a ring network cabinet provided by a specific implementation method of the utility model.

[0025] In the figure:

[0026] 100. Fixing device of zero sequence mutual inductor; 110. Cable fixing beam; 111. First oblong hole; 112. Mounting flange; 113. Rivet nut;

[0027] 120. Cable clamp; 121. First connecting member;

[0028] 130. Transformer fixing beam; 131. Second oblong hole;

[0029] 140. Overall fixing frame; 141. Third oblong hole;

[0030] 200, cabinet body; 201, cable room; 210, left cabinet panel; 220, right cabinet panel; 300, zero-sequence transformer. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] like Figure 1 to Figure 2 As shown in , the utility model discloses a fixing device 100 for a zero-sequence transformer, which is suitable for the installation scenario of cables and current transformers in a ring network cabinet. The fixing device 100 for a zero-sequence transformer includes a cable fixing assembly, a cable clamp 120 and a transformer fixing assembly. Among them, the cable fixing assembly has an escape space for the cable to pass through; the cable clamp is centrally installed on the cable fixing assembly, and is used to clamp the cable placed in the escape space, and the cable clamp can be fine-tuned along the first direction, and has a certain degree of adjustment freedom, which can better adapt to the installation requirements of cable clamps 120 of different specifications, facilitate on-site installation, and further improve assembly efficiency; illustratively, the cable clamp 120 connected to the cable fixing beam 110 can be selected from a cable clamp 120 that can fix and install a single-phase cable, and the cable fixing beam 110 can also meet the installation of a three-phase integrated fixed cable clamp 120.

[0036] At the same time, the transformer fixing beam 130 is used to install the zero-sequence transformer 300. In order to make the zero-sequence transformer 300 correspond to the avoidance space, the transformer fixing component is adjustably connected to the cable fixing component along the second direction. Under the premise of ensuring the installation strength, the adjustable installation of the zero-sequence transformer 300 and the cable clamp 120 is achieved, and the effect of the cable clamp 120 being centered in the through hole of the zero-sequence transformer 300 can be achieved, which facilitates the cable to pass through the zero-sequence transformer 300.

[0037] Specifically, the cable fixing assembly is provided with a first oblong hole 111, and the first oblong hole 111 is extended along a first direction. The cable clamp 120 is provided with a first connecting piece 121, and the first connecting piece 121 can pass through the first oblong hole 111 and be adjustably connected to the cable fixing assembly, thereby reducing the number of punching times and improving the accuracy of the relative adjustable feeding of the cable clamp 120 and the cable fixing assembly to a certain extent. The implementation method is simple and reduces the large movements of complete disassembly and assembly.

[0038] Similarly, a second oblong hole 131 is selected to be opened on the transformer fixing assembly, and the second oblong hole 131 is extended along the second direction, and a mounting flange 112 is provided at the upper end of the cable fixing assembly for connecting the transformer fixing assembly, which can effectively save materials, reduce material costs and unnecessary structural space occupation. The mounting flange 112 is provided with a second connector, and the second connector can pass through the second oblong hole 131 and be adjustably connected to the transformer fixing assembly. The transformer fixing assembly can be adjusted along the second direction on the cable fixing assembly; the first direction and the second direction are in the same plane and are not parallel, and the cable and the zero-sequence transformer 300 have the freedom of these two directions respectively to complete flexible adjustment under different space occupation conditions, and the assembly freedom is significantly improved. Exemplarily, an internal thread can be provided on the mounting flange 112, and an external thread can be provided on the outer periphery of the second connector. The mounting flange 112 is threadedly connected to the second connector for easy disassembly and assembly.

[0039] Preferably, the second direction is arranged parallel to the zero-sequence transformer 300 and perpendicular to the first direction, so as to facilitate maintenance personnel to calculate and control the position adjustment feed of the zero-sequence transformer 300. The adjustment distance of the second connecting member on the corresponding second oblong hole 131 is the adjustment distance of the position of the zero-sequence transformer 300. The precise adjustment can be digitized through measurement, thus avoiding rework of the secondary adjustment process and saving time and effort.

[0040] In this embodiment, the second connecting member includes a rivet nut 113 and a stud, the rivet nut 113 is riveted to the mounting portion, and one end of the stud is provided with a second oblong hole 131 and is screwed to the rivet nut 113, which can not only improve the installation efficiency, but also achieve the purpose of rapid adjustment and fixation, and is convenient for multiple disassembly and assembly. Optionally, the assembly form of the rivet nut 113 and the stud is selected in a special position to achieve the purpose of stable installation and easy replacement. For example, the fixation of the transformer fixing component and the zero-sequence transformer 300 can be riveted by the rivet nut 113. When assembled and used later, the assembly efficiency can be greatly improved, and the replaced transformer fixing component can also be recycled for multiple times. Exemplarily, the rivet nut 113 can also be welded and fixed to the mounting portion to further improve the structural stability. It can be understood that any method that can fix the rivet nut 113 and the mounting portion can be realized.

[0041] Preferably, the fixing device 100 of the zero-sequence transformer is not only suitable for the installation scenario of a single cable in a ring main unit, but also suitable for the installation form of dual cables. It relates to a ring main unit in the form of dual cable inlets and outlets. The cable fixing assembly specifically includes two cable fixing beams 110. The two cable fixing beams 110 are arranged in parallel and spaced apart along the second direction and extended along the first direction to form an avoidance space between the two cable fixing beams 110. At least one cable clamp 120 is respectively arranged on each cable fixing beam 110. By adjusting the installation position of the cable clamp 120 and the zero-sequence transformer 300, both cables can pass through the zero-sequence transformer 300. Correspondingly, the transformer fixing assembly also includes two transformer fixing beams 130, which are arranged in parallel and spaced apart along the first direction and extended along the second direction. The two transformer fixing beams 130 are respectively used to fix the two ends of the zero-sequence transformer 300, so that the zero-sequence transformer 300 can be installed more stably; the two transformer fixing beams 130 are respectively connected to the cable fixing assembly and placed on both sides of the avoidance space in the first direction, and are combined with the cable fixing beam 110 to form a "well"-shaped installation, which also improves the structural reliability of the zero-sequence transformer fixing device 100.

[0042] Furthermore, according to the cylindrical structure of most cables, in order to save internal space and facilitate the two cables to pass through the zero-sequence transformer 300 in the center to prevent unnecessary interference, the cable clamps 120 on the two cable fixing beams 110 are staggered to be more suitable for the inner diameter specifications of the through hole of the zero-sequence transformer 300.

[0043] In this embodiment, the fixing device 100 of the zero-sequence transformer also includes at least two integral fixing frames 140, which are connected to the inner wall of the cable chamber 201. The two ends of the cable fixing assembly are respectively connected to the corresponding integral fixing frames 140 in an adjustably connected manner along the height direction, which can facilitate the change of the installation position of the cable and the zero-sequence transformer 300 in the height direction, further improving the space utilization and adjustability in the cable chamber 201, and the height can be adjusted according to the on-site installation conditions to achieve the purpose of convenient installation.

[0044] Furthermore, the integral fixing frame 140 is provided with a plurality of third oblong holes 141, and the third oblong holes 141 all extend in the height direction. The cable fixing assembly is provided with a third connecting piece, and the third connecting piece passes through the third oblong hole 141 and is adjustably connected to the integral fixing frame 140. For example, when the installation adjustment direction is not convenient for maintenance personnel to operate manually, or when in order to avoid the installation of the fixing device 100 of the zero-sequence transformer penetrating the cable chamber 201, it is possible to design an assembly fold for the integral fixing frame 140, and to open the third oblong hole 141 on the assembly fold. It is understandable that in order to improve assembly efficiency and achieve the purpose of rapid adjustment and fixing, the third connecting piece adopts the same rivet nut 113 and stud as the second connecting piece, which is convenient for multiple disassembly and assembly to ensure the stability of the structural assembly.

[0045] Specific as Figure 3 As shown in the figure, the utility model discloses a ring network cabinet, including the fixing device 100 of the zero-sequence transformer as described above, and the ring network cabinet also includes a cabinet body 200, a cable and a zero-sequence transformer 300. A cable chamber 201 is provided in the cabinet body 200, and the fixing device 100 of the zero-sequence transformer is installed in the cable chamber 201. The structure is simple and the assembly is convenient. The zero-sequence transformer 300 and the cable clamp are accurately installed in the position through the adjustable and movable cable clamp 120 and the transformer fixing assembly, so as to save the space in the cable chamber 201 and facilitate the assembly of cables and other components.

[0046] In this embodiment, the fixing device 100 of the zero-sequence transformer is integrally assembled in the cable chamber 201 of the ring network cabinet. The cabinet body 200 includes a left cabinet panel 210 and a right cabinet panel 220. An integral fixing frame 140 is respectively provided at both ends of the cable fixing beam 110. The two integral fixing frames 140 are respectively fixedly connected to the left cabinet panel 210 and the right cabinet panel 220. The integral fixing frames 140 are vertically arranged to the ground, and the cable fixing beam 110 is parallel to the ground and horizontally installed on the integral fixing frames 140. The internal space planning of the ring network cabinet is more neat and reasonable.

[0047] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A fixing device for a zero-sequence transformer, characterized in that: include: A cable fixing assembly, wherein the cable fixing assembly has an escape space, and the escape space is used for passing the cable; a cable clamp (120), the cable clamp (120) being centrally arranged on the cable fixing assembly, the cable clamp (120) being adjustably connected to the cable fixing assembly along a first direction, and the cable clamp (120) being used to clamp the cable placed in the avoidance space; A transformer fixing component, the transformer fixing component is used to fix a zero-sequence transformer (300), the transformer fixing component and the cable fixing component are adjustably connected along a second direction so that the zero-sequence transformer (300) is arranged corresponding to the avoidance space.

2. The fixing device of the zero-sequence mutual inductor according to claim 1, characterized in that: The cable fixing assembly comprises two cable fixing beams (110), the two cable fixing beams (110) are arranged in parallel and spaced apart along the second direction and extend along the first direction, the avoidance space is formed between the two cable fixing beams (110), and at least one cable clamp (120) is arranged on each of the cable fixing beams (110).

3. The fixing device of the zero-sequence mutual inductor according to claim 2, characterized in that: The cable clamps (120) on the two cable fixing beams (110) are arranged in a staggered manner.

4. The fixing device of the zero-sequence mutual inductor according to claim 1, characterized in that: The cable fixing assembly is provided with a first oblong hole (111), the first oblong hole (111) extending along the first direction, and the cable clamp (120) is provided with a first connecting piece (121), the first connecting piece (121) passes through the first oblong hole (111) and is adjustably connected to the cable fixing assembly.

5. The fixing device of the zero-sequence mutual inductor according to claim 1, characterized in that: The transformer fixing assembly comprises two transformer fixing beams (130), the two transformer fixing beams (130) are arranged in parallel and spaced apart along the first direction and extend along the second direction, the two transformer fixing beams (130) are respectively used to fix two ends of the zero-sequence transformer (300), and the two transformer fixing beams (130) are respectively connected to the cable fixing assembly and are placed on both sides of the avoidance space in the first direction.

6. The fixing device of the zero-sequence mutual inductor according to claim 1, characterized in that: The transformer fixing assembly is provided with a second oblong hole (131), the second oblong hole (131) extends along the second direction, the upper end of the cable fixing assembly is provided with a mounting flange (112), the mounting flange (112) is provided with a second connecting piece, the second connecting piece passes through the second oblong hole (131) and is adjustably connected to the transformer fixing assembly.

7. The fixing device of the zero-sequence mutual inductor according to claim 6, characterized in that: The second connecting member comprises a rivet nut (113) and a stud, the rivet nut (113) being riveted to the mounting flange (112), and one end of the stud being provided with the second oblong hole (131) and being screwed to the rivet nut (113).

8. The fixing device for a zero-sequence mutual inductor according to any one of claims 1 to 7, characterized in that: The fixing device of the zero-sequence transformer also includes at least two integral fixing frames (140), wherein the integral fixing frames (140) are connected to the inner wall of the cable chamber (201), and the two ends of the cable fixing assembly are respectively connected to the corresponding integral fixing frames (140) in a height direction so as to be adjustably connected.

9. The fixing device of the zero-sequence mutual inductor according to claim 8, characterized in that: The integral fixing frame (140) is provided with a third oblong hole (141), and the third oblong hole (141) extends along the height direction. The cable fixing assembly is provided with a third connecting piece, and the third connecting piece passes through the third oblong hole (141) and is adjustably connected to the integral fixing frame (140).

10. Ring main unit, characterized in that: The ring main unit comprises a fixing device for a zero-sequence transformer as claimed in any one of claims 1 to 9, wherein the ring main unit further comprises a cabinet body (200), a cable chamber (201) is arranged in the cabinet body (200), and the fixing device for the zero-sequence transformer is arranged in the cable chamber (201).

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