Common box type ring main unit
By adopting an integrated test sleeve in a common box ring grid cabinet, the problem of increasing cost and low insulation in the prior art test sleeve is solved, and the effect of reducing costs and improving insulation is achieved.
Patent Information
- Application Number
- CN202421494063.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-06-27
AI Technical Summary
In the existing common box ring grid cabinet, three independent test sleeves increase manufacturing and installation costs, and there is a potential risk of air box leakage, and at the same time, the insulation is low and there is a safety hazard.
An integrated test sleeve is adopted. The sleeve body is located inside the air box with multiple terminals. The length of the terminals is distributed stepwise, reducing the number of holes in the air box and potential air box leakage points.
Reduces costs and maintenance frequency, improves installation efficiency and insulation, and enhances the safety performance of the common box ring grid cabinet.
Smart Images
Figure CN222785655U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electrical equipment, in particular to a common box type ring network cabinet. Background Art
[0002] The common box type ring main unit is widely used in urban and rural distribution networks around the world due to its stable performance and compact structure. One or more three-position switches are installed in the cabinet of the common box type ring main unit. Each three-position switch corresponds to an incoming line unit. Each incoming line unit is provided with three incoming line bushings of phase A, phase B and phase C. The corresponding incoming line unit is provided with three independent test bushings of phase A, phase B and phase C. The three incoming line bushings of phase A, phase B and phase C are electrically connected to the three independent test bushings of phase A, phase B and phase C respectively, so as to perform insulation tests on the corresponding incoming cables. The three independent test bushings increase the manufacturing and installation costs, and the installation location of each test bushing is a potential gas box leakage point, which increases the difficulty and frequency of maintenance.
[0003] In addition, since the wiring terminals of the three independent test bushings inside the gas box are equal in length, the insulation strength between two adjacent wiring terminals is relatively low, which will lead to reduced insulation of the common ring main unit and pose a safety hazard.
[0004] Therefore, there is an urgent need for a test bushing and a common box type ring main unit to solve the problems in the prior art. Utility Model Content
[0005] The purpose of the utility model is to provide a common-box type ring network cabinet, which adopts an integrated test sleeve, can reduce costs, reduce the number of openings on the gas box, reduce potential gas box leakage points, improve installation efficiency, reduce maintenance frequency, and improve the insulation of the test sleeve.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] A common box type ring main unit comprises a gas box and a test bushing, wherein the test bushing comprises a bushing body, and the bushing body is arranged on the gas box. The bushing body is located on the inner side of the gas box and is provided with a plurality of wiring terminals, and the lengths of the plurality of wiring terminals are distributed in a stepped manner.
[0008] Optionally, it also includes:
[0009] A plurality of main busbar copper bars, wherein the plurality of main busbar copper bars are arranged in the gas box at intervals along a first direction, and each of the main busbar copper bars extends along a second direction;
[0010] An inlet unit, comprising a plurality of inlet bushings, wherein the plurality of inlet bushings are all arranged on the gas box;
[0011] A switch unit, the switch unit corresponds to the incoming line unit and is arranged in the gas box, the switch unit is configured to make a plurality of the incoming line bushings and a plurality of the main busbar copper bars conductively connected in a one-to-one correspondence to form a plurality of incoming line loops; and / or, the switch unit is configured to make a plurality of the incoming line bushings and a plurality of the wiring terminals conductively connected in a one-to-one correspondence to form a plurality of grounding loops.
[0012] Optionally, the switch unit includes:
[0013] A three-position switch, comprising a plurality of moving contacts, each of the moving contacts corresponds to a stationary contact and a grounding contact, and each of the stationary contacts is conductively connected to a main bus copper bar to form a main bus circuit;
[0014] A plurality of branch busbars, each of which is connected to an incoming line bushing and a moving contact, and the moving contact contacts the corresponding static contact to form the incoming line loop;
[0015] A plurality of test busbars, each of which is connected to a grounding contact and a wiring terminal, and the moving contact contacts the corresponding grounding contact to form the grounding loop.
[0016] Optionally, a bending portion is provided at one end of the test busbar away from the bushing body.
[0017] Optionally, a vulcanization layer is provided on the bending portion.
[0018] Optionally, the test busbar is a round copper busbar.
[0019] Optionally, the sleeve body is arranged on the side wall of the air box along the second direction, and the first direction, the second direction and the third direction are perpendicular to each other.
[0020] Optionally, the common-box type ring main unit includes at least two incoming line units and at least two switch units, each incoming line unit corresponds to one switch unit, at least two switch units are arranged in the gas box at intervals along the second direction, and the test busbars of the two switch units are connected to the same test bushing and grounded.
[0021] Optionally, an insulating reinforcement portion is provided between two adjacent connecting terminals.
[0022] Optionally, the side of the insulating reinforcement portion facing away from the sleeve body is a straight side, an arc side or a wavy side.
[0023] Beneficial effects:
[0024] The common-box type ring main unit provided by the utility model adopts an integrated test bushing, which can reduce costs, reduce the number of openings on the gas box, reduce potential gas box leakage points, improve installation efficiency, and reduce maintenance frequency; and, the bushing body is located on the inner side of the gas box and is provided with a plurality of wiring terminals, the lengths of the plurality of wiring terminals are distributed in a stepped manner, which increases the distance between two adjacent wiring terminals, improves the insulation of the test bushing, and improves the safety performance of the common-box type ring main unit. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of the structure of the test sleeve provided by the utility model at one viewing angle;
[0026] Figure 2 It is a structural schematic diagram of the test sleeve provided by the utility model from another viewing angle;
[0027] Figure 3 It is a structural schematic diagram of the L1 three-position switch and the L2 three-position switch of the common box type ring network cabinet provided by the utility model, both of which are in the closed position at one viewing angle;
[0028] Figure 4 It is a structural schematic diagram of the L1 three-position switch and the L2 three-position switch of the common box type ring network cabinet provided by the utility model, both of which are in the closed position from another perspective;
[0029] Figure 5 It is a schematic diagram of the structure in which the test busbar of the L1 switch unit and the test busbar of the L2 switch unit provided by the utility model are connected to the same test bushing for short circuit;
[0030] Figure 6 It is a structural schematic diagram of the common box type ring network cabinet provided by the utility model, in which the L1 three-position switch is in the closing position and the L2 three-position switch is in the opening position;
[0031] Figure 7 It is a structural schematic diagram of a common box type ring network cabinet provided by the utility model, in which the L1 three-position switch is in the open position and the L2 three-position switch is in the closed position.
[0032] In the figure:
[0033] 100. Gas box;
[0034] 200, test bushing; 210, bushing body; 220, connection terminal; 221, A-phase connection terminal; 222, B-phase connection terminal; 223, C-phase connection terminal; 230, insulation reinforcement portion;
[0035] 300, main busbar copper bar;
[0036] 400, incoming line bushing; 410, A-phase incoming line bushing; 420, B-phase incoming line bushing; 430, C-phase incoming line bushing;
[0037] 500, switch unit; 501, L1 switch unit; 502, L2 switch unit; 510, three-position switch; 511, L1 three-position switch; 512, L2 three-position switch; 520, branch bus; 530, test bus; 5301, bending part; 5302, vulcanized layer; 531, L1A phase test bus; 532, L1B phase test bus; 533, L1C phase test bus; 534, L2A phase test bus; 535, L2B phase test bus; 536, L2C phase test bus;
[0038] 540, incoming cable; 541, L1 incoming cable; 542, L2 incoming cable. DETAILED DESCRIPTION
[0039] 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.
[0040] 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.
[0041] 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.
[0042] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships 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.
[0043] Embodiment 1
[0044] This embodiment provides a common box type ring main unit, such as Figure 1-Figure 5 As shown, the common box type ring main unit includes an air box 100 and a test bushing 200, the test bushing 200 includes a bushing body 210, the bushing body 210 is arranged on the air box 100, the bushing body 210 is located inside the air box 100 and is provided with a plurality of wiring terminals 220, and the lengths of the plurality of wiring terminals 220 are distributed in a step-like manner. Compared with the split test bushing 200 in the prior art, the common box type ring main unit provided in this embodiment adopts an integrated test bushing 200, which can improve the structural strength of the test bushing 200, reduce the production cost, reduce the number of openings on the air box 100, reduce the potential leakage points of the air box 100, improve the installation efficiency, and reduce the maintenance frequency; and the bushing body 210 is located inside the air box 100 and is provided with a plurality of wiring terminals 220, and the lengths of the plurality of wiring terminals 220 are distributed in a step-like manner, which increases the distance between two adjacent wiring terminals 220, improves the insulation of the test bushing 200, and improves the safety performance of the common box type ring main unit.
[0045] It should be noted that if Figure 2 As shown, L10 represents the distance between the two ends of two adjacent connecting terminals 220, and L20 represents the vertical distance between two adjacent connecting terminals 220, wherein L10 is greater than L20. Therefore, the stepped arrangement of terminals can effectively increase the distance between the terminals and improve the insulation performance.
[0046] Alternatively, if Figure 3As shown, the common box type ring main unit also includes an incoming line unit, a switch unit 500 and a plurality of main busbar copper bars 300, the plurality of main busbar copper bars 300 are arranged in the gas box 100 at intervals along the first direction, each main busbar copper bar 300 extends along the second direction, the incoming line unit includes a plurality of incoming line bushings 400, the plurality of incoming line bushings 400 are arranged on the side wall of the gas box 100, and the plurality of incoming line bushings 400 are respectively electrically connected to a plurality of incoming line cables 540; the switch unit 500 corresponds to the incoming line unit and is arranged In the gas box 100, the switch unit 500 is used to make multiple incoming bushings 400 and multiple main bus copper bars 300 conductively connected one by one to form multiple incoming line loops, so that the common box type ring network cabinet can realize the function of power transmission and provide electric energy for the electrical equipment downstream of the common box type ring network cabinet; or, the switch unit 500 is used to make multiple incoming bushings 400 and multiple wiring terminals 220 conductively connected one by one to form multiple grounding loops, so as to test the insulation of multiple incoming cables 540. The common box type ring network cabinet in this embodiment not only realizes the function of power transmission and provides stable electric energy for downstream electrical equipment through the combination of the incoming line unit, the switch unit 500 and the multiple main bus copper bars 300, but also can perform insulation testing by forming multiple grounding loops, thereby improving the safety of the system.
[0047] In other embodiments, when there are two switch units 500, one of the switch units 500 is used to make the corresponding multiple incoming bushings 400 and the multiple wiring terminals 220 conductively connected one by one to form multiple grounding loops, thereby testing the insulation of the corresponding multiple incoming cables 540 (that is, the switch unit is in a grounded state); the other switch unit 500 is used to make the corresponding multiple incoming bushings 400 and the multiple main bus copper bars 300 conductively connected one by one to form multiple incoming loops (that is, the switch unit is in a closed state), so that the common box type ring main unit can realize the function of power transmission and provide electrical energy for the electrical equipment downstream of the common box type ring main unit, thereby realizing the insulation test of the multiple incoming cables 540 of one of the lines without affecting the normal power supply function of the other line. Alternatively, when there are two switch units 500, one of the switch units 500 is in a grounded state to test the insulation of the corresponding multiple incoming cables 540, and the other switch unit 500 can be in an open state. The states of the two switch units 500 can be selectively switched according to actual testing requirements.
[0048] Alternatively, if Figure 3-Figure 4As shown, the switch unit 500 includes a three-position switch 510, a plurality of branch busbars 520 and a plurality of test busbars 530. The three-position switch 510 includes a plurality of moving contacts, and a plurality of static contacts and a plurality of grounding contacts are provided corresponding to the plurality of moving contacts. Each moving contact corresponds to a static contact and a grounding contact, and each static contact is connected to a main bus copper bar 300 to form a main bus circuit; each branch busbar 520 is electrically connected to an incoming line bushing 400 and a moving contact, and the moving contact contacts with its corresponding static contact to form a plurality of incoming line circuits; each test busbar 530 is electrically connected to a grounding contact and a wiring terminal 220, and the moving contact contacts with its corresponding grounding contact to form a grounding circuit. By means of the switch unit 500 including the three-position switch 510, the plurality of branch busbars 520 and the plurality of test busbars 530, the common box type ring main unit realizes efficient power transmission and insulation test functions, and the specific circuit transmission process and test process are as follows.
[0049] like Figure 3-Figure 4 As shown, in this embodiment, the incoming line unit includes three main busbars 300, three incoming line bushings 400, the switch unit 500 includes a three-position switch 510, three branch busbars 520 and three test busbars 530, a three-position switch 510 includes three moving contacts, three static contacts and three grounding contacts, and the three-position switch 510 has three positions of closing position, opening position and grounding position, and the bushing body 210 is provided with three wiring terminals 220, and the above electrical components are all installed in the same sealed stainless steel gas box 100. Among them, three main busbars 300 are defined as A-phase main busbar 300, B-phase main busbar 300, and C-phase main busbar 300, respectively; three incoming line bushings 400 are respectively A-phase incoming line bushing 410, B-phase incoming line bushing 420, and C-phase incoming line bushing 430, respectively; three moving contacts are respectively A-phase moving contact, B-phase moving contact, and C-phase moving contact, three stationary contacts are respectively A-phase stationary contact, B-phase stationary contact, and C-phase stationary contact, three grounding contacts are respectively A-phase grounding contact, B-phase grounding contact, and C-phase grounding contact, and three wiring terminals 220 are respectively A-phase wiring terminal 221, B-phase wiring terminal 222, and C-phase wiring terminal 223. The circuit connection relationship within the common box type ring network cabinet is as follows: the A-phase main busbar copper bar 300, the B-phase main busbar copper bar 300, and the C-phase main busbar copper bar 300 are electrically connected to the A-phase static contact, the B-phase static contact, and the C-phase static contact, respectively, to form three main busbar loops; the A-phase incoming line bushing 410, the B-phase incoming line bushing 420, and the C-phase incoming line bushing 430 are electrically connected to the A-phase moving contact, the B-phase moving contact, and the C-phase moving contact, respectively, through three branch busbars 520; the A-phase grounding contact, the B-phase grounding contact, and the C-phase grounding contact are electrically connected to the A-phase terminal 221, the B-phase terminal 222, and the C-phase terminal 223, respectively, through three test busbars 530, and the side of the bushing body 210 away from the terminal 220 is connected to the grounding copper bar.
[0050] On the basis of the above circuit connection relationship, when the three-position switch 510 is in the closed position, the three moving contacts are respectively in contact with the three static contacts (i.e., the A-phase moving contact is in contact with the A-phase static contact, the B-phase moving contact is in contact with the B-phase static contact, and the C-phase moving contact is in contact with the C-phase static contact), so that the three incoming line bushings 400 are respectively connected with the three main busbars 300 (i.e., the A-phase incoming line bushing 410 is connected with the A-phase main busbar 300, the B-phase incoming line bushing 420 is connected with the B-phase main busbar 300, and the C-phase incoming line bushing 430 is connected with the C-phase main busbar 300), forming three incoming line loops to supply power to the downstream equipment of the common box type ring network cabinet; when the three-position switch 510 is in the closed position, the three moving contacts are respectively in contact with the three static contacts (i.e., the A-phase incoming line bushing 410 is connected with the A-phase main busbar 300, the B-phase incoming line bushing 420 is connected with the B-phase main busbar 300, and the C-phase incoming line bushing 430 is connected with the C-phase main busbar 300), forming three incoming line loops to supply power to the downstream equipment of the common box type ring network cabinet; When the switch 510 is in the open position, the incoming line circuit is disconnected; when the three-position switch 510 is in the grounding position, the three moving contacts are in contact with the three grounding contacts (i.e., the A-phase moving contact is in contact with the A-phase grounding contact, the B-phase moving contact is in contact with the B-phase grounding contact, and the C-phase moving contact is in contact with the C-phase grounding contact), so that the three incoming line bushings 400 are connected to the three terminals 220 (i.e., the A-phase incoming line bushing 410 is connected to the A-phase terminal 221, the B-phase incoming line bushing 420 is connected to the B-phase terminal 222, and the C-phase incoming line bushing 430 is connected to the C-phase terminal 223), thereby forming three grounding circuits to perform insulation tests on the three incoming cables 540.
[0051] Alternatively, if Figure 5 As shown, a bending portion 5301 is provided at one end of the test busbar 530 away from the bushing body 210. By setting the bending portion 5301, the layout of the test busbar 530 can be optimized. The test busbar 530 can be arranged more flexibly in a limited space to avoid interference with other components, thereby making the internal structure of the common box type ring network cabinet more compact and improving space utilization.
[0052] Alternatively, if Figure 5 As shown, a vulcanization layer 5302 is provided on the bending portion 5301, which can improve the insulation performance of the test busbar 530, avoid electrical failures, and further improve the safety of the common box type ring main unit.
[0053] Optionally, the test busbar 530 is a round copper busbar, which can optimize the internal wire layout of the gas box 100 and the internal electric field distribution of the gas box 100. The optimized design makes the wire layout more compact and the electric field distribution more uniform, reducing the risk of electrical failure and improving the stability and reliability of the system.
[0054] Alternatively, if Figure 3-Figure 4As shown, the bushing body 210 is arranged on the side wall of the gas box 100 along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. By arranging the bushing body 210 on the side wall of the gas box 100 along the second direction, it is convenient to connect the connection terminal 220 on the bushing body 210 with the switch unit 500 through the test bus 530, avoiding the interference between the test bus 530 and other electrical components in the gas box 100, so that the internal structure of the common box type ring main unit is optimized, the space utilization rate and layout flexibility are improved, and the reliability and safety of the common box type ring main unit are improved. In addition, the bushing body 210 arranged along the third direction also facilitates the wiring operation of the maintenance personnel, and enhances the maintenance convenience and efficiency of the equipment.
[0055] Alternatively, if Figure 2 As shown, an insulation reinforcement portion 230 is provided between two adjacent connection terminals 220 , which further strengthens the structural strength of the test bushing 200 and improves the insulation strength of the test bushing 200 .
[0056] Optionally, the sleeve body 210 is fixed to the air box 100 by a fastener, which can ensure that the sleeve body 210 is firmly connected to the air box 100, improve the stability of the sleeve body 210, and improve the reliability of the test results. In this embodiment, the fastener is a fastening screw, which has a good fastening effect and effectively prevents the sleeve body 210 from loosening or falling off.
[0057] Optionally, the side of the insulating reinforcement part 230 away from the bushing body 210 is a straight side. The straight side is easy to process and can simplify the manufacturing process of the insulating reinforcement part, thereby improving the manufacturing efficiency of the test bushing.
[0058] In one embodiment, the side of the insulation reinforcement part 230 away from the bushing body 210 is an arc-shaped side or a wavy side, which can increase the creepage distance of the arc and further improve the insulation effect. In this embodiment, it is preferred that the side of the insulation reinforcement part 230 away from the bushing body 210 is an arc-shaped side, and the opening of the arc-shaped side is away from the side of the bushing body 210, which can effectively improve the insulation effect of the insulation reinforcement part 230 and improve the safety of the test bushing.
[0059] Embodiment 2
[0060] The present embodiment provides a common-box type ring main unit, which has a structure basically the same as that of the common-box type ring main unit in Implementation 1, and differs from Implementation 1 in that the common-box type ring main unit in the present embodiment includes at least two switch units 500, and the incoming line units correspond one-to-one to the switch units 500, and the test busbars 530 of all switch units 500 are connected to and grounded with the same test bushing 200, so that insulation tests can be performed on multiple incoming cables 540 of multiple incoming line units through the same test bushing 200, without the need to repeatedly disassemble and assemble the test device, thereby improving the test efficiency.
[0061] Specifically, the present embodiment includes two switch units 500, three main busbars 300 are spaced apart along a first direction, and each main busbar 300 extends along a second direction, two switch units are spaced apart along the second direction in the gas box 100, and the test bushing 200 is arranged on the side wall of the gas box 100 along a third direction, so as to optimize the connection lines between the switch unit 500 and the test busbar 530 and the test bushing 200, and avoid interference in the connection lines. In the present embodiment, the first direction, the third direction, and the second direction are perpendicular to each other. Define that two switch units 500 are L1 switch unit 501 and L2 switch unit 502 respectively, the incoming line unit and three-position switch 510 corresponding to the L1 switch unit 501 are L1 incoming line unit and L1 three-position switch 511 respectively, the incoming line unit and three-position switch 510 corresponding to the L2 switch unit 502 are L2 incoming line unit and L2 three-position switch 512 respectively, the connection relationship between the L1 switch unit 501 and the L1 incoming line unit and the L1 three-position switch 511, and the connection relationship between the L2 switch unit 502 and the L2 incoming line unit and the L2 three-position switch 512 are the same as the connection relationship listed in Example 1, and will not be repeated here. Among them, the A phase grounding contact, B phase grounding contact, and C phase grounding contact on the L1 three-position switch 511 are electrically connected to the A phase terminal 221, B phase terminal 222, and C phase terminal 223, respectively, and the A phase grounding contact, B phase grounding contact, and C phase grounding contact on the L2 three-position switch 512 are electrically connected to the A phase terminal 221, B phase terminal 222, and C phase terminal 223 on the same test sleeve 200, respectively.
[0062] In addition, the three test buses 530 of the L1 switch unit 501 are defined as L1A phase test bus 531, L1B phase test bus 532, and L1C phase test bus 533, and the three test buses 530 of the L2 switch unit 502 are defined as L2A phase test bus 534, L2B phase test bus 535, and L2C phase test bus 536. Among them, the L1A phase test bus 531 and the L2A phase test bus 534 are short-circuited and connected to the A phase terminal 221 of the test bushing 200; the L1B phase test bus 532 and the L2B phase test bus 535 are short-circuited and connected to the B phase terminal 222 of the test bushing 200; the L1C phase test bus 533 and the L2C phase test bus 536 are short-circuited and connected to the C phase terminal 223 of the test bushing 200, thereby realizing reliable grounding of the common box type ring main unit system and improving safety.
[0063] The shared box type ring main unit provided in this embodiment has three test processes, and the specific test processes are as follows:
[0064] First, if Figure 3As shown, the L1 three-position switch 511 of the L1 switch unit 501 and the L2 three-position switch 512 of the L2 switch unit 502 are respectively operated to the grounding position, and a test voltage is applied to the connection terminal 220 of the test bushing 200 located outside the gas box 100. This test voltage passes through the test bushing 200, the three test busbars 530 of the L1 switch unit 501, the L1 three-position switch 511, the three branch busbars 520 of the L1 switch unit 501, and the three incoming bushings 400 of the L1 switch unit 501; And the three test busbars 530 of the L2 switch unit 502, the L2 three-position switch 512, the three branch busbars 520 of the L2 switch unit 502, and the three incoming line bushings 400 of the L2 switch unit 502 are simultaneously applied to the three L1 incoming line cables 541 of the L1 switch unit 501 and the three L2 incoming line cables 542 of the L2 switch unit 502, so as to realize the parallel withstand voltage test of the incoming line cables 540 of the L1 switch unit 501 and the L2 switch unit 502 at the same time, which can effectively reduce the workload on site;
[0065] Second, if Figure 6 As shown, the L1 three-position switch 511 of the L1 switch unit 501 is operated to the grounding position, and the L2 three-position switch 512 of the L2 switch unit 502 is operated to the opening position. By applying a test voltage to the connection terminal 220 of the test bushing 200 located outside the gas box 100, this test voltage is applied to the three L1 incoming cables 541 of the L1 switch unit 501 through the test bushing 200, the three test busbars 530 of the L1 switch unit 501, the L1 three-position switch 511, the three branch busbars 520 of the L1 switch unit 501, and the three incoming bushings 400 of the L1 switch unit 501, so that the L1 incoming cables 541 of the L1 switch unit 501 can be subjected to a withstand voltage test separately;
[0066] Third, if Figure 7 As shown, the L2 three-position switch 512 of the L2 switch unit 502 is operated to the grounding position, and the L1 three-position switch 511 of the L1 switch unit 501 is operated to the opening position. A test voltage is applied to the terminal 220 of the test bushing 200 located outside the gas box 100. This test voltage is applied to the three L2 incoming cables 542 of the L2 switch unit 502 through the test bushing 200, the three test busbars 530 of the L2 switch unit 502, the L2 three-position switch 512, the three branch busbars 520 of the L2 switch unit 502, and the three incoming bushings 400 of the L2 switch unit 502, so that a withstand voltage test can be performed on the L2 incoming cables 542 of the L2 switch unit 502 separately.
[0067] Therefore, after the common-box type ring main unit is assembled, the incoming cables 540 of all the switch units 500 of the common-box type ring main unit can be tested simultaneously, and the incoming cables 540 of any one of the switch units 500 in the common box can also be tested separately, thereby realizing the diversification of the test functions, reducing the time for disassembling and assembling the detection cable device, and improving the detection efficiency.
[0068] It should be noted that in other embodiments, three switch units, four switch units, five switch units, etc. can be set in the air box according to actual needs, and the number of switch units set is not specifically limited.
[0069] 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. The common box type ring main unit is characterized by: The invention comprises an air box (100) and a test bushing (200), wherein the test bushing (200) comprises a bushing body (210), wherein the bushing body (210) is arranged on the air box (100), and wherein the bushing body (210) is located on the inner side of the air box (100) and is provided with a plurality of connection terminals (220), wherein the lengths of the plurality of connection terminals (220) are distributed in a stepped manner.
2. The common box type ring main unit according to claim 1 is characterized in that: Also includes: A plurality of main busbar copper bars (300), wherein the plurality of main busbar copper bars (300) are arranged in the gas box (100) at intervals along a first direction, and each of the main busbar copper bars (300) extends along a second direction; An incoming line unit, comprising a plurality of incoming line bushings (400), wherein the plurality of incoming line bushings (400) are all arranged on the gas box (100); A switch unit (500), the switch unit (500) corresponding to the incoming line unit and arranged in the gas box (100), the switch unit (500) being configured to make a plurality of the incoming line bushings (400) and a plurality of the main busbar copper bars (300) electrically connected in a one-to-one correspondence to form a plurality of incoming line loops; and / or the switch unit (500) being configured to make a plurality of the incoming line bushings (400) and a plurality of the connection terminals (220) electrically connected in a one-to-one correspondence to form a plurality of grounding loops.
3. The common box type ring main unit according to claim 2 is characterized in that: The switch unit (500) comprises: A three-position switch (510) comprises a plurality of moving contacts, each of the moving contacts corresponds to a stationary contact and a grounding contact, and each of the stationary contacts is conductively connected to a main bus copper bar (300) to form a main bus circuit; A plurality of branch busbars (520), each of the branch busbars (520) being connected to an incoming line bushing (400) and a moving contact, the moving contact being in contact with the corresponding static contact to form the incoming line loop; A plurality of test busbars (530), each of the test busbars (530) is connected to a grounding contact and a wiring terminal (220), and the moving contact contacts the corresponding grounding contact to form the grounding loop.
4. The common box type ring main unit according to claim 3 is characterized in that: A bending portion (5301) is provided at one end of the test busbar (530) away from the bushing body (210).
5. The common box type ring main unit according to claim 4 is characterized in that: A vulcanization layer (5302) is provided on the bending portion (5301).
6. The common box type ring main unit according to claim 3 is characterized in that: The test busbar (530) is a round copper busbar.
7. The common box type ring main unit according to claim 2, characterized in that: The sleeve body (210) is arranged on the side wall of the air box (100) along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.
8. The common box type ring main unit according to claim 2, characterized in that: The common box type ring main unit comprises at least two incoming line units and at least two switch units (500), each incoming line unit corresponds to one switch unit (500), at least two switch units (500) are arranged in the gas box (100) at intervals along the second direction, and the test busbars (530) of the two switch units (500) are connected to the same test bushing (200) and grounded.
9. The common box type ring main unit according to any one of claims 1 to 8, characterized in that: An insulating reinforcement portion (230) is provided between two adjacent connection terminals (220).
10. The common box type ring main unit according to claim 9, characterized in that: The side of the insulating reinforcement portion (230) facing away from the sleeve body (210) is a straight side, an arc side or a wavy side.