A cable accessory mounting system for a switchgear

Abstract

The application discloses a cable accessory installation system for a switch cabinet, which comprises a switch cabinet body, switch equipment installed in the switch cabinet body, and a plurality of plug-in cable accessories, wherein the plurality of plug-in cable accessories are divided into two groups, namely a cable accessory module one and a cable accessory module two; the cable accessory module one is installed on the side surface of the switch cabinet body and connected with the switch equipment to form a loop; and the cable accessory module two is installed on the top surface of the switch cabinet body and connected with the switch equipment to form a loop.The application has the beneficial effects that the plurality of cable accessories are divided into two groups, the length of each cable accessory module can be effectively shortened, the installation times of the cable accessories are reduced, the problem of burning near the cable accessories is greatly reduced, and the safety and stability of the switch cabinet operation are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of switch cabinets, in particular to a cable accessory installation system for a switch cabinet. BACKGROUND

[0002] Power cable accessories are products that connect cables with power transmission and distribution lines and related power distribution devices. In the power system, (plug-in) cable accessories are an important part of the cable line, and their advantages mainly lie in the following aspects: (1) sealing and protection: cable accessories can effectively seal the cable end or connection, preventing the intrusion of water, dust, chemicals, etc., and avoiding insulation performance degradation or short circuit failure; (2) mechanical protection: providing mechanical support and tensile strength, reducing damage to the cable from external forces (such as vibration and bending), and prolonging the service life of the cable; (3) simplifying installation and maintenance: convenient to disassemble and assemble, reducing on-site construction time, and adaptable to different cable types and specifications, flexible in complex laying environments.

[0003] In the prior art, as shown in Figure 4 , the plug-in cable accessory adopts a multi-loop installation structure, i.e., multiple cable accessories are sequentially plugged together. However, this scheme has resulted in a large number of cases of cable head burnout during operation. Therefore, how to further improve the installation of cable accessories in existing switch cabinets to ensure the safety and stability of the switch cabinet during operation is a problem that needs to be solved by those skilled in the art. SUMMARY

[0004] One of the purposes of the present application is to provide a cable accessory installation system for a switch cabinet with high safety and stability.

[0005] To achieve the above purposes, the technical scheme adopted by the present application is as follows: a cable accessory installation system for a switch cabinet, comprising a switch cabinet body and a switch device installed in the switch cabinet body, further comprising a plurality of plug-in cable accessories, the plurality of plug-in cable accessories are divided into two groups of a cable accessory module one and a cable accessory module two, the cable accessory module one is installed on the side surface of the switch cabinet body and connected to the switch device to form a loop, and the cable accessory module two is installed on the top surface of the switch cabinet body and connected to the switch device to form a loop.

[0006] Preferably, the switch cabinet adopts a double-cable incoming and outgoing line loop, the cable accessory module one comprises a first incoming line accessory and a second incoming line accessory, the first incoming line accessory and the second incoming line accessory are respectively connected to two incoming line cables; the cable accessory module two comprises a voltage transformer accessory and a surge arrester accessory, the switch cabinet further comprises a voltage transformer, the voltage transformer accessory is connected to the voltage transformer through a joint assembly, and the surge arrester accessory has a surge arrester function.

[0007] Preferably, the switch cabinet further comprises an incoming line cabinet body, the incoming line cabinet body and the switch cabinet body are arranged side by side, the first incoming line accessory and the second incoming line accessory are arranged in the incoming line cabinet body; the voltage transformer is installed on the top surface of the incoming line cabinet body.

[0008] Preferably, the first incoming line accessory and the second incoming line accessory are arranged in a horizontal direction, two incoming line cables are connected to the first incoming line accessory and the second incoming line accessory in a vertical direction; the voltage transformer accessory and the lightning arrester accessory are arranged in a vertical direction, and the joint assembly extends in a horizontal direction and connects the voltage transformer accessory and the voltage transformer.

[0009] Preferably, an instrument room is installed on the front side of the top surface of the switch cabinet, and an installation area for installing the voltage transformer and the second cable accessory module is formed between the instrument room and the top surface of the switch cabinet.

[0010] Preferably, a shell for protecting the voltage transformer and the second cable accessory module is installed on the top end of the switch cabinet, and the projection of the shell in the vertical direction completely coincides with the projection of the switch cabinet in the vertical direction.

[0011] Preferably, an installation hole is formed in the top surface of the switch cabinet body, and an incoming and outgoing line sleeve is installed in the installation hole, and the incoming and outgoing line sleeve is connected and matched with the second cable accessory module.

[0012] Preferably, a wire hole is arranged below the first cable accessory module on the bottom surface of the incoming line cabinet body, so that the incoming line cable passing through the wire hole is in a vertical state.

[0013] Preferably, a pair of cable clamps are arranged on the inner side of the incoming line cabinet body, and the cable clamps are suitable for limiting and fixing the incoming line cable, so that the incoming line cable is arranged in an orderly manner.

[0014] Preferably, a harmonic eliminator is installed on the top surface of the incoming line cabinet body, and the harmonic eliminator is connected with the voltage transformer.

[0015] Compared with the prior art, the application has the following advantages:

[0016] (1) The application divides a plurality of cable accessories into two groups, which can effectively shorten the length of each cable accessory module, i.e. reduce the installation frequency of the cable accessories, thereby greatly reducing the burning problem near the cable accessories and improving the safety and stability of the switch cabinet operation.

[0017] (2) The two groups of cable accessory modules are installed at different positions of the switch cabinet body, so that the two groups of cable accessory modules are more convenient to install or disassemble, for example, when a module needs to be repaired or replaced, it will not be affected by the other module; of course, it can also reduce the mutual influence between the two groups of cable accessory modules, such as the arrangement of cables between them, the superimposed influence of heat dissipation, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a primary wiring diagram of the switch cabinet in the prior art.

[0019] Figure 2 It is a schematic view of the overall structure of the switch cabinet in the prior art.

[0020] Figure 3 It is a schematic view of the internal structure of the incoming line cabinet body in the prior art.

[0021] Figure 4 It is a schematic view of the four-return installation structure of the existing cable accessory.

[0022] Figure 5 It is a primary wiring diagram of the switch cabinet of the present application.

[0023] Figure 6 It is a schematic view of the overall structure of the switch cabinet of the present application.

[0024] Figure 7 It is a schematic view of the internal structure of the incoming line cabinet body of the present application.

[0025] Figure 8 It is a schematic view of the front structure of the present application. Figure 7

[0026] Figure 9 It is a schematic view of the specific structure of the two groups of cable accessory modules of the present application.

[0027] In the figure: 1, switch cabinet; 101, incoming line cabinet body; 102, circuit breaker cabinet body; 103, grid-connected contactor cabinet body; 2, voltage transformer; 3, instrument room; 4, installation area; 5, incoming and outgoing line bushing; 6, cable accessory module one; 601, first incoming line accessory; 602, second incoming line accessory; 7, cable accessory module two; 701, voltage transformer accessory; 702, surge arrester accessory; 8, cable clamp; 9, support frame; 10, incoming line cable; 11, shell; 12, harmonic eliminator; 13, joint assembly; 14, blocking bar; 15, mounting hole. DETAILED DESCRIPTION

[0028] In the following, the present application will be further described in conjunction with specific embodiments, and it should be noted that the embodiments described below or the technical features between the embodiments can be combined in any manner to form new embodiments without conflict.​

[0029] In the description of the present application, it should be noted that for orientation words, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0031] I. Background

[0032] ① Doubly-fed wind turbine generator set as the core component of variable speed constant frequency system is the key technology equipment for localization. It adopts the structure of wound rotor induction generator, which is composed of motor body of stator, rotor and bearing system, and system including water cooling, air-air cooling and air-water cooling three cooling modes.

[0033] ② Variable speed operation can maximize the absorption of wind energy and improve efficiency, and large capacity variable speed constant frequency system is the mainstream direction of wind power technology, among which the unit using doubly-fed asynchronous generator still occupies the dominant position. Doubly-fed generator adopts the structure of stator directly connected to the power grid and rotor connected to the power grid through converter, which automatically adjusts the parameters (frequency / voltage / amplitude / phase) of rotor power supply through frequency converter to realize constant frequency power generation in wide speed range. Based on the "flexible connection" system constructed by AC excitation technology, the excitation current can be dynamically adjusted according to the state of the power grid and the speed, and the output power quality can be accurately controlled to meet the load and grid connection requirements.

[0034] ③ The output power of the stator of the doubly-fed wind turbine generator is constant frequency and constant voltage AC power, which can be directly connected to the grid; the rotor slip power can also be connected to the grid after conversion.

[0035] In summary, doubly-fed generator is a new type of generator that combines the advantages of asynchronous generator and synchronous generator. It has good speed regulation performance, independent regulation of active and reactive power, improvement of power factor, improvement of system stability, relatively small excitation capacity, etc. It can be widely used in new renewable energy power generation systems such as wind power and pumped storage.

[0036] The stator side capacity of the double-fed unit accounts for more than 80% of the total capacity. When the stator voltage is raised to 10kV, the cost saved by the stator side and the unit side is particularly prominent, and the competitiveness of the wind turbine is obviously advantageous.

[0037] II. The ring network cabinet (i.e. switch cabinet 1) matched with the double-fed generator set is composed of three cabinets: grid-connected contactor cabinet 103, circuit breaker cabinet 102 and incoming line cabinet 101. The grid-connected contactor cabinet 103 is directly connected to the stator side of the double-fed unit, and is used to realize the grid connection and disconnection of the generator and the power grid. The circuit breaker cabinet 102 is connected behind the grid-connected contactor cabinet 103 for protecting the generator set, and the incoming line cabinet 101 is connected with the 35kV box transformer on the grid side.

[0038] Further analysis of the problems of the existing plug-in cable accessory in actual use:

[0039] As shown in Figure 1 , it is a primary wiring diagram of the existing switch cabinet 1. Based on the primary wiring diagram, the structure layout of the existing switch cabinet 1 is obtained as shown in Figure 2 , the switch cabinet 1 includes the grid-connected contactor cabinet 103, the circuit breaker cabinet 102 and the incoming line cabinet 101. As shown in Figure 3 , the plug-in cable accessory is used for power connection on the side of the circuit breaker cabinet 102, and the cable accessory is a multi-loop structure. However, a large number of cases of burning near the cable head have occurred in operation. The main reason is that due to the long horizontal length, the gap between the cable accessories increases under the action of gravity and stress, which increases the resistance and heat, and finally leads to the burning near the cable head.

[0040] Therefore, the inventors of the present application have developed a cable accessory mounting system for a switch cabinet 1, which, as shown in Figures 1 to 9 , includes a switch cabinet and a switch device mounted in the switch cabinet, and further includes a plurality of plug-in cable accessories, which are divided into two groups: cable accessory module one 6 and cable accessory module two 7. The cable accessory module one 6 is installed on the side of the switch cabinet and connected to the switch device to form a loop, and the cable accessory module two 7 is installed on the top of the switch cabinet and connected to the switch device to form a loop.

[0041] It can be understood that the existing multi-loop integral cable accessory in the prior art is divided into two groups and installed on the side and top of the switch cabinet, which can effectively shorten the length of each cable accessory module, thereby reducing the problem of increased resistance and heat caused by the increase of the gap between the cable accessories under the action of gravity and stress, and improving the safety and stability of the switch cabinet operation.

[0042] In addition, by dividing the cable accessory module into two groups and installing them at different positions of the switch cabinet body, the layout of the switch cabinet can be optimized, and the installation and maintenance of the cable accessories are more convenient. At the same time, the design of different positions can reduce the mutual influence between the two groups of cable accessory modules, further improving the overall performance and reliability of the switch cabinet.

[0043] It should be noted that how the cable accessory module and the switch device are electrically connected to form a loop is public common knowledge known to those skilled in the art, and therefore will not be described in detail here. The switch cabinet body described above includes a circuit breaker cabinet body 102 and a grid-connected contactor cabinet body 103.

[0044] In the embodiment, as shown in Figure 3 and Figure 4 The switch cabinet 1 in the present application adopts a double-cable incoming and outgoing line loop, and further includes a voltage transformer 2, so that the cable accessories of four-loop structure are required to meet the actual needs: two incoming cables 10 plus the connection cable of the voltage transformer 2 plus the surge arrester. Therefore, four cable accessories are taken as an example for detailed description in the present application.

[0045] As a further description of the above embodiment: the cable accessory module one 6 includes a first incoming cable accessory 601 and a second incoming cable accessory 602, and the first incoming cable accessory 601 and the second incoming cable accessory 602 are connected to two incoming cables 10 respectively. The cable accessory module two 7 includes a voltage transformer accessory 701 and a surge arrester accessory 702, the voltage transformer accessory 701 is connected to the voltage transformer 2 through a joint assembly 13, and the surge arrester accessory 702 has a surge arrester function.

[0046] As can be seen, the original four-loop structure cable accessories are divided into two groups, forming two independent modules. The advantages of such design are: ① The number of cable accessory installations is reduced, and the problem of failure caused by installing too many cable accessories is reduced; ② By installing the cable accessory module two 7 on the top side of the switch cabinet body, the top space of the switch cabinet body is effectively utilized, and the installation difficulty caused by insufficient space is avoided; ③ By installing the cable accessory module one 6 and the cable accessory module two 7 at different positions of the switch cabinet body, the distribution of the cable accessories is more reasonable, the mutual influence between the cable accessories is reduced, and the safety and heat dissipation of the system are further improved. ④ The maintainability of the system is improved; when a module needs to be repaired or replaced, it will not be affected by the other module.

[0047] It should be noted that; because the application adopts a double incoming line structure, therefore in considering the classification of cable accessories and the principle of uniform distribution, it is preferred to adopt the grouping mode of two pairs in the above. Of course, based on the actual installation needs, the four installed cable accessories in the above can be divided into one, three or two modules, and the above effects can also be achieved. In addition, when the number of cable accessories adopts two, three or five structures, and so on, they can also be designed in a grouped manner, thereby ensuring the safety and stability of the switch cabinet. As a person skilled in the art, the probability of failure is small when using two and three structures of cable accessories, which can meet the actual needs, so adaptive grouping design can be made according to actual conditions; and in actual conditions, generally more than five and more than five cable accessories are not used.

[0048] In one embodiment of the application, as shown in Figure 7 The switch cabinet 1 also includes an incoming line cabinet body 101, which is arranged side by side with the switch cabinet body, and the first incoming line accessory 601 and the second incoming line accessory 602 are arranged in the incoming line cabinet body 101; and the voltage transformer 2 is installed on the top surface of the incoming line cabinet body 101.

[0049] Specifically, as shown in Figure 3 The instrument room 3 is installed at the top front side of the incoming line cabinet body 101 and the switch cabinet body (i.e. the circuit breaker cabinet body 102); and the installation area 4 for installing the voltage transformer 2 and the cable accessory module two 7 is formed between the top end of the incoming line cabinet body 101 and the circuit breaker cabinet body 102.

[0050] It can be understood that this installation area 4 is inherent to the switch cabinet 1 itself, and is not improved for the design in the above. That is, the installation area 4 is used to adaptively install the voltage transformer 2 and the cable accessory module two 7. Of course, the strength of the top end of the original incoming line cabinet body 101 and the circuit breaker cabinet body 102 may not be enough; therefore, during actual installation, adaptive installation of the frame at the top end of the switch cabinet 1 can meet the strength requirements.

[0051] The installation position of the original cable accessory connected to the two-way incoming line cable 10 is unchanged, and the original scheme is to install the voltage transformer 2 at the bottom end of the incoming line cabinet body 101, and the improved design is to install the voltage transformer 2 at the top end of the incoming line cabinet body 101. In this way, on the one hand, it is convenient to connect and wire with the cable accessory module two 7; on the other hand, it further improves the space utilization and heat dissipation effect of the incoming line cabinet body 101.

[0052] Further preferably, as shown in Figures 7 to 9As shown, the first incoming line accessory 601 and the second incoming line accessory 602 are plugged in and unplugged in the horizontal direction, and the two incoming line cables 10 are connected to the first incoming line accessory 601 and the second incoming line accessory 602 in the vertical direction, respectively. The voltage transformer accessory 701 and the surge arrester accessory 702 are plugged in and unplugged in the vertical direction, and the connector assembly 13 extends in the horizontal direction and connects the voltage transformer accessory 701 and the voltage transformer 2.

[0053] like Figure 7 and Figure 8 As shown, for cable accessory module 6, a wire hole is provided on the bottom surface of the inlet cabinet 101 corresponding to the lower part of the cable accessory module 6. The incoming cable 10 enters through the wire hole and connects to the first inlet accessory 601 and the second inlet accessory 602, thus ensuring that the incoming cable 10 passing through the wire hole is in a vertical position. This avoids large bending angles of the incoming cable 10 in the horizontal direction, thereby ensuring the stability and safety of the incoming cable 10 during use. At the same time, the wire hole also makes the routing of the incoming cable 10 neater and clearer, improving the overall aesthetics of the switch cabinet 1.

[0054] Of course, a pair of cable clamps 8 can be installed inside the incoming cable cabinet 101. The cable clamps 8 can limit and fix the two incoming cables 10 so that the incoming cables 10 are neatly arranged. At the same time, it can also prevent the incoming cables 10 from shaking or falling off during use, further improving the connection stability and safety of the incoming cables 10.

[0055] like Figure 9 As shown, for cable accessory module 2 7, the length directions of voltage transformer accessory 701, surge arrester accessory 702 and connector assembly 13 are all parallel to the length direction of switch cabinet 1. This is to minimize the bending of the connecting cables, and it is also based on the installation space on the circuit breaker cabinet 102.

[0056] In this embodiment, as Figure 9 As shown, mounting holes 15 are provided on the top surface of the switch cabinet (i.e., circuit breaker cabinet 102), and inlet / outlet bushings 5 ​​are installed in the mounting holes 15. The inlet / outlet bushings 5 ​​are connected to the cable accessory module 7. In the original design, the side of the circuit breaker cabinet 102 also had mounting holes 15 and inlet / outlet bushings 5 ​​installed, allowing the inlet / outlet bushings 5 ​​to connect to the corresponding cable accessory module 6. It is clear that almost no changes were made to the original switch cabinet 1 structure; only the installation positions of the cable accessories and voltage transformer 2 were modified, thus improving upon the problems in the existing technology. This design is simple to operate, low in cost, and easy to promote. At the same time, this design also makes the layout of the entire switch cabinet 1 more reasonable, installation more convenient, and improves the safety and stability of the system.

[0057] It should be noted that how the incoming and outgoing bushings 5 ​​are connected to the switchgear inside the circuit breaker cabinet 102 is common knowledge known to those skilled in the art, and therefore will not be described in detail here.

[0058] Further optimization, such as Figure 9 As shown, in order to improve the isolation between the incoming and outgoing bushings 5 ​​at the top of the circuit breaker cabinet 102, spaced baffles 14 are installed at the top of the circuit breaker cabinet 102. The baffles 14 can form multiple isolation zones at the top of the circuit breaker cabinet 102, and the incoming and outgoing bushings 5 ​​are installed in the corresponding isolation zones, so that each incoming and outgoing bushing 5 will not affect each other, thus improving the stability and safety of the cable accessory installation system.

[0059] Further optimization, such as Figure 6 As shown, to enhance the protection of the voltage transformer 2, a housing 11 can be installed at the top of the switchgear 1. The housing 11 can enclose the voltage transformer 2 and the cable accessory module 7. The housing 11 must meet the following condition: its vertical projection completely coincides with the vertical projection of the switchgear 1. In other words, the housing 11 cannot extend beyond the switchgear 1 horizontally to avoid interference with the original placement of the switchgear 1. The height of the housing 11 is not specifically limited and can be set according to the actual situation.

[0060] Further optimization involves installing a harmonic suppressor 12 at the top of the incoming line cabinet 101, which is connected in conjunction with the voltage transformer 2. It is understood that the cooperation between the voltage transformer 2 and the harmonic suppressor 12 is a key measure for the safe operation of the power system. By suppressing ferroresonance, limiting overvoltage and overcurrent, it ensures the long-term stable operation of the voltage transformer 2, while simultaneously maintaining the power quality and reliability of the power grid.

[0061] Finally, it should be noted that this invention mainly focuses on the improved design within the incoming line cabinet 101. Doubly fed generator sets typically use a 150mm diameter to save production costs. 2 A dual-cable input / output scheme.

[0062] Original solution: such as Figures 1 to 4 As shown, the incoming line cabinet 101 needs to install components such as voltage transformer 2 (PT) and surge arrester accessory 702; that is, first incoming line accessory 601 + second incoming line accessory 602 + voltage transformer accessory 701 + surge arrester accessory 702. This solution has resulted in numerous cases of cable heads burning out during operation; furthermore, due to space limitations within the wind turbine tower, the size of switch cabinet 1 cannot be increased, making the wiring within the incoming line cabinet 101 extremely difficult.

[0063] Improvement plan: such as Figures 5 to 9 As shown, in addition to the existing set of incoming and outgoing line bushings 5 ​​on the side of the original circuit breaker cabinet 102, a new set of incoming and outgoing line bushings 5 ​​is added to the top surface of the circuit breaker cabinet 102. The voltage transformer 2, which was originally located at the bottom of the incoming line cabinet 101, is moved to the top of the cabinet and connected to the newly added incoming and outgoing line bushings 5. At the same time, the surge arrester accessory 702 is also moved to the top. After adopting the improved scheme, each set of incoming and outgoing line bushings 5 ​​only needs to be connected twice, which greatly improves the operational reliability of the switchgear 1. At the same time, the incoming cable 10 inside the incoming line cabinet 101 can be directly introduced from the bottom of the cabinet, which also improves the reliability of the switchgear 1. Cable connection is also more convenient.

[0064] To further understand the beneficial effects of improved design, such as... Figure 3 As shown, this is the original design, which has three sets of integrated four-circuit cable accessories, with two incoming cables 10 in each set. Since there are three phases, there are six incoming cables 10 located within the incoming cabinet 101. Figure 7 The diagram shows the improved solution. The two figures clearly demonstrate that:

[0065] ① The original four-circuit cable accessories were divided into two-circuit structures with pairs of two wires each. This rational design reduced the number of installations and thus improved system stability.

[0066] ②Since the cable accessory module 2 7 is installed on the top side of the circuit breaker cabinet 102, that is, the cable accessory module 2 7 adopts a vertical plug-in method, compared with the original horizontal installation method, it effectively reduces the problem of the gap between cable accessories increasing due to gravity, and greatly improves the stability during installation.

[0067] ③ Installing the voltage transformer 2 at the top of the incoming line cabinet 101 provides clearance for the installation and routing of the incoming cable 10 in the cable accessory module 6, allowing the incoming cable 10 to be bent as little as possible during wiring. We know that the incoming cable 10 itself has a certain strength, so bending will generate stress. Prolonged stress can easily lead to cable fatigue or even breakage. Therefore, reducing cable bending can effectively improve the cable's service life and the safety of the entire system.

[0068] ④ The original plan required multiple sets (more than two sets) of cable clamps 8, such as... Figure 3 As shown, this is due to the bent arrangement of the incoming cable 10 and the cable connecting to the voltage transformer 2. The improved solution only requires one pair to achieve an orderly arrangement, while also improving the ease of installation.

[0069] ⑤ Installing the voltage transformer 2 and cable accessory module 2 7 on top improves the space utilization rate inside the incoming line cabinet 101 and reduces mutual interference between electrical components. On the other hand, the separate installation of electrical components, combined with the orderly and less curved design of the wiring, can greatly reduce the heat generation inside the incoming line cabinet 101, increase the heat dissipation space inside the incoming line cabinet 101, and make the overall heat dissipation of the switch cabinet 1 better.

[0070] ⑥ The four-circuit cable accessories in the original plan are inconvenient to install and maintain. The reason is: (e.g., ...) Figure 3 As shown, due to its long lateral length, the bottom of the last surge arrester accessory 702 generally requires a support frame 9 for support during actual installation. This necessitates the installation and removal of the support frame 9, which is very inconvenient. Furthermore, the design of the support frame 9 increases costs and occupies space within the incoming line cabinet 101. The improved one-to-two-circuit cable accessory, however, fully meets the usage requirements, eliminating the need for the support frame 9, thus making subsequent installation and maintenance much more convenient.

[0071] In summary, the design of this application only adds a protective shell 11 to the switchgear 1 and makes some drilling designs. That is, based on the existing mounting area 4 at the top of the incoming line cabinet 101 and the circuit breaker cabinet 102, the voltage transformer 2 is designed to be mounted on top, making full use of the structural characteristics of the switchgear 1 itself. It can be said that almost no changes have been made to the structure of the switchgear 1 itself; of course, if Figure 1 and Figure 5 It can also be seen that the primary wiring diagram of switch cabinet 1 has been adapted, which not only reduces production costs, but also improves the ease of disassembly and assembly, the ease of subsequent maintenance, the heat dissipation of switch cabinet 1, and reduces mutual interference between electrical components.

[0072] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A cable accessory installation system for a switchgear, comprising a switchgear body and switchgear installed within the switchgear body, characterized in that: It also includes multiple pluggable cable accessories, which are divided into two groups: cable accessory module one and cable accessory module two. Cable accessory module one is installed on the side of the switch cabinet and connected to the switchgear to form a circuit, while cable accessory module two is installed on the top surface of the switch cabinet and connected to the switchgear to form a circuit. The switchgear adopts a dual-cable inlet and outlet circuit. The cable accessory module one includes a first inlet accessory and a second inlet accessory, which are respectively connected to two inlet cables. The cable accessory module two includes a voltage transformer accessory and a surge arrester accessory. The switchgear also includes a voltage transformer. The voltage transformer accessory is connected to the voltage transformer through a connector assembly. The surge arrester accessory has a surge arrester function. The switch cabinet also includes an incoming line cabinet, which is arranged side by side with the switch cabinet. The first incoming line accessory and the second incoming line accessory are disposed in the incoming line cabinet. The voltage transformer is installed on the top surface of the incoming line cabinet. An instrument compartment is installed on the front of the top surface of the switch cabinet, and an installation area is formed between the instrument compartment and the top surface of the switch cabinet for installing the voltage transformer and the second cable accessory module. The top of the switch cabinet is equipped with a housing that protects the voltage transformer and the second cable accessory module. The vertical projection of the housing completely coincides with the vertical projection of the switch cabinet.

2. The cable accessory installation system for switchgear as described in claim 1, characterized in that: The first and second incoming line accessories are plugged in and unplugged in the horizontal direction, and the two incoming line cables are connected to the first and second incoming line accessories in the vertical direction, respectively; the voltage transformer accessory and the surge arrester accessory are plugged in and unplugged in the vertical direction, and the connector assembly extends in the horizontal direction and connects the voltage transformer accessory and the voltage transformer.

3. The cable accessory installation system for switchgear as described in claim 1, characterized in that: The top surface of the switch cabinet is provided with mounting holes, and inlet / outlet sleeves are installed in the mounting holes. The inlet / outlet sleeves are connected and cooperate with the cable accessory module two.

4. The cable accessory installation system for switchgear as described in claim 1, characterized in that: The bottom surface of the incoming line cabinet is provided with a wire hole corresponding to the lower part of the cable accessory module one, so that the incoming line cable passing through the wire hole is in a vertical state.

5. The cable accessory installation system for switchgear as described in claim 4, characterized in that: The inner side of the incoming line cabinet is provided with a pair of cable clamps, which are suitable for limiting and fixing the incoming line cable so that the incoming line cable is neatly arranged.

6. The cable accessory installation system for switchgear as described in claim 1, characterized in that: A harmonic suppressor is installed on the top surface of the incoming line cabinet, and the harmonic suppressor is connected in conjunction with the voltage transformer.

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