A cable accessory mounting structure for a switchgear

Abstract

This application discloses a cable accessory installation structure for switchgear, characterized by comprising: a switchgear body and a switchgear installed within the switchgear body, and multiple pluggable cable accessories. These pluggable cable accessories 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 switchgear body and connects to the switchgear to form a circuit. Cable accessory module two is installed on the side of the switchgear body at a different installation height than cable accessory module one, or on other sides of the switchgear body, and forms a circuit with the switchgear. The beneficial effects of this application are: dividing the multiple cable accessories into two groups effectively shortens the length of each cable accessory module, thus reducing the number of installation cycles for the cable accessories, significantly reducing the problem of burn-out near the cable accessories, and improving the safety and stability of the switchgear operation.

Description

Technical Field

[0001] This application relates to the field of switchgear technology, and in particular to a cable accessory installation system for switchgear. Background Technology

[0002] Power cable accessories are products that connect cables to power transmission and distribution lines and related power distribution equipment. Of course, in the power system, (plug-in) cable accessories are an important part of the cable line. Their advantages are mainly reflected in the following aspects: (1) Sealing and protection: Cable accessories can effectively seal the cable ends or connections to prevent moisture, dust, chemicals and other substances from entering, and avoid insulation performance degradation or short circuit faults; (2) Mechanical protection: Provide mechanical support and tensile strength, reduce damage to the cable by external forces (such as vibration and bending), and extend the cable life; (3) Simplified installation and maintenance: They are easy to install and remove, reduce on-site construction time, and can be adapted to different cable types and specifications, flexibly responding to complex laying environments.

[0003] In the existing solutions, such as Figure 4 As shown, the pluggable cable accessories employ a multi-turn installation structure, where multiple cable accessories are sequentially plugged in. However, this design has resulted in numerous cases of cable heads burning out during operation. Therefore, how to further improve the installation of cable accessories in existing switchgear to ensure the safety and stability of the switchgear during operation is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] One objective of this application is to provide a cable accessory mounting structure for switchgear that offers high security and stability.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a cable accessory installation structure for a switch cabinet, characterized in that it includes: a switch cabinet body and a switchgear installed in the switch cabinet body, and further includes multiple pluggable cable accessories, wherein the multiple pluggable cable accessories 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 body and connected to the switchgear to form a circuit; cable accessory module two is installed on the side of the switch cabinet body and is located at a different installation height from cable accessory module one, or cable accessory module two is installed on other sides of the switch cabinet body, and cable accessory module two forms a circuit with the switchgear.

[0006] Preferably, the switchgear adopts a dual-cable inlet and outlet circuit. The first cable accessory module includes a first inlet accessory and a second inlet accessory, which are respectively connected to two inlet cables. The second cable accessory module 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.

[0007] Preferably, the switch cabinet further 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, and the second cable accessory module is installed on the top surface of the switch cabinet.

[0008] Preferably, the switch cabinet further 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 switch cabinet, and the second cable accessory module is installed on the side of the switch cabinet and located above the first cable accessory module.

[0009] Preferably, the first incoming line accessory and the second incoming line accessory are plugged in and unplugged in the horizontal direction, and the two incoming line cables are respectively connected to the first incoming line accessory and the second incoming line accessory in the vertical direction; 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.

[0010] Preferably, an instrument compartment is installed on the front side of the top of the switch cabinet, and the instrument compartment and the top surface of the switch cabinet form an installation area for installing the voltage transformer and the second cable accessory module.

[0011] Preferably, the top of the switch cabinet is equipped with a housing that protects the voltage transformer and the second cable accessory module, and the vertical projection of the housing completely coincides with the vertical projection of the switch cabinet.

[0012] Preferably, the top surface of the switch cabinet is provided with a mounting hole, and an inlet / outlet sleeve is installed in the mounting hole. The inlet / outlet sleeve is connected and cooperates with the cable accessory module two.

[0013] Preferably, the bottom surface of the incoming cable cabinet is provided with a wire hole corresponding to the lower part of the cable accessory module one, so that the incoming cable passing through the wire hole is in a vertical state.

[0014] Preferably, 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.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] This invention divides multiple cable accessories into two groups, which can effectively shorten the length of each cable accessory module, thereby reducing the number of installation cycles of the cable accessories and greatly reducing the problem of burn-out near the cable accessories, thus improving the safety and stability of the switchgear operation. Attached Figure Description

[0017] Figure 1 This is the primary wiring diagram for the switchgear in the existing scheme.

[0018] Figure 2 This is a schematic diagram of the overall structure of the switchgear in the existing scheme.

[0019] Figure 3 This is a schematic diagram of the internal structure of the incoming line cabinet in the existing scheme.

[0020] Figure 4 This is a schematic diagram of the existing four-loop cable accessory installation structure.

[0021] Figure 5 This is the primary wiring diagram of the switch cabinet of this utility model.

[0022] Figure 6 This is a schematic diagram of the overall structure of the switch cabinet of this utility model.

[0023] Figure 7 This is a schematic diagram of the internal structure of the incoming line cabinet of this utility model.

[0024] Figure 8 For the present utility model Figure 7 A frontal view of the structure.

[0025] Figure 9 This is a schematic diagram of the specific structure of the two sets of cable accessory modules of this utility model.

[0026] In the diagram: 1. Switch cabinet; 101. Incoming line cabinet; 102. Circuit breaker cabinet; 103. Grid-connected contactor cabinet; 2. Voltage transformer; 3. Instrument room; 4. Installation area; 5. Incoming and outgoing line bushings; 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 cable; 11. Housing; 12. Harmonic suppressor; 13. Connector assembly; 14. Retaining strip; 15. Mounting hole. Detailed Implementation

[0027] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0028] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0029] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0030] I. Background Information:

[0031] ① As the core component of the variable speed constant frequency system, the doubly-fed wind turbine generator set is a key technological equipment for achieving domestic production. It adopts a wound-rotor induction generator structure, consisting of a motor body composed of a stator, rotor, and bearing system, and a system that includes three cooling methods: water cooling, air-to-air cooling, and air-to-water cooling.

[0032] ② Variable speed operation maximizes wind energy absorption and improves efficiency. Large-capacity variable speed constant frequency systems are the mainstream direction of wind power technology, with units using doubly-fed asynchronous generators still dominating. The doubly-fed generator adopts a structure where the stator is directly connected to the grid and the rotor is connected to the grid via a converter. The inverter automatically adjusts the rotor power parameters (frequency / voltage / amplitude / phase) to achieve constant frequency power generation over a wide speed range. A "flexible connection" system based on AC excitation technology can dynamically adjust the excitation current according to grid conditions and speed, precisely controlling the output power quality to meet load and grid connection requirements.

[0033] ③ The stator output power of the doubly fed wind turbine 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.

[0034] In summary, the doubly-fed generator is a new type of generator that combines the advantages of asynchronous and synchronous generators. It offers advantages such as good speed regulation, independent adjustment of active and reactive power, improved grid power factor, enhanced system stability, and relatively small excitation capacity. It can be widely used in new renewable energy power generation systems, such as wind power and pumped storage.

[0035] The stator side capacity of the doubly-fed unit accounts for more than 80% of the whole machine capacity. When the stator voltage is increased to 10 kV, the cost saved on the stator side and the grid side of the unit is particularly prominent, which has obvious advantages for the competitiveness of wind turbines.

[0036] II. The ring main unit (i.e., switchgear 1) supporting the doubly-fed generator set consists of three cabinets: the grid-connected contactor cabinet 103, the circuit breaker cabinet 102, and the incoming line cabinet 101. Among them, the grid-connected contactor cabinet 103 is directly connected to the stator side of the doubly-fed unit to realize the grid connection and disconnection of the generator and the grid. The circuit breaker cabinet 102 is connected behind the grid-connected contactor cabinet 103 to protect the generator set, and the incoming line cabinet 101 is connected to the 35 kV box transformer on the grid side.

[0037] Further analyze the problems that occur in the actual use of the existing plug-in cable accessories:

[0038] As Figure 1 shown, it is the primary wiring diagram of the existing switchgear 1. Based on the primary wiring diagram, the structural layout of the existing switchgear 1 is obtained. As Figure 2 shown, the switchgear 1 includes the grid-connected contactor cabinet 103, the circuit breaker cabinet 102, and the incoming line cabinet 101. As Figure 3 shown, plug-in cable accessories are used for power connection on the side of the circuit breaker cabinet 102, and the cable accessories are of a multi-circuit structure. In this scheme, a large number of cases of burning near the cable heads have occurred during operation. The main reasons are as follows: due to its relatively long horizontal length, the gap between the cable accessories becomes larger under the action of gravity and stress, which in turn makes the resistance increase and the heat generation increase, ultimately leading to the situation of burning near the cable head;

[0039] Therefore, the inventor of this application has developed a cable accessory installation system for the switchgear 1. As shown in Figures 1 to 9 one of its embodiments, it includes a switchgear body and switch equipment installed in the switchgear body, and also includes a plurality of plug-in cable accessories. The plurality of plug-in cable accessories are divided into two groups: the cable accessory module one 6 and the cable accessory module two 7. The cable accessory module one 6 is installed on the side of the switchgear body and connected to the switch equipment to form a circuit, and the cable accessory module two 7 is installed on the top surface of the switchgear body and connected to the switch equipment to form a circuit.

[0040] It can be understood that dividing the multi-circuit integral installation cable accessories in the prior art into two groups and installing them on the side and top surface of the switchgear body respectively can effectively shorten the length of each cable accessory module, thereby reducing the problem of increased resistance and heat generation caused by the increase in the gap between the cable accessories under the action of gravity and stress, and improving the safety and stability of the operation of the switchgear.

[0041] Furthermore, by dividing the cable accessory modules into two groups and installing them in different locations within the switchgear, the switchgear layout can be optimized, making the installation and maintenance of cable accessories more convenient. At the same time, the different locations reduce the mutual interference between the two groups of cable accessory modules, further improving the overall performance and reliability of the switchgear.

[0042] It should be noted that how the cable accessory modules and switchgear are electrically connected to form a circuit is common knowledge known to those skilled in the art, and therefore will not be described in detail here. The switch cabinets mentioned above include circuit breaker cabinet 102 and grid-connected contactor cabinet 103.

[0043] In this embodiment, as Figure 3 and Figure 4 As shown, the switchgear 1 in this application adopts a dual-cable incoming and outgoing circuit, and the switchgear 1 also includes a voltage transformer 2; thus, a four-circuit cable accessory structure is required to meet the actual needs: that is, two incoming cables 10 plus the connecting cable to the voltage transformer 2 plus a surge arrester. Therefore, this application uses four cable accessories as an example for detailed description.

[0044] As a further description of the above embodiments: Cable accessory module one 6 includes a first incoming cable accessory 601 and a second incoming cable accessory 602, which are respectively connected to two incoming cables 10. 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 connector assembly 13, and the surge arrester accessory 702 has a surge arrester function.

[0045] Therefore, grouping the original four-turn cable accessories into two independent modules in pairs offers several advantages: ① It reduces the number of cable accessory installations, lowering the risk of malfunctions caused by excessive installation; ② By installing cable accessory module 2 (7) on the top side of the switch cabinet, it effectively utilizes the top space, avoiding installation difficulties due to insufficient space; ③ By installing cable accessory module 1 (6) and cable accessory module 2 (7) in different locations within the switch cabinet, the distribution of cable accessories is more rational, reducing mutual interference between them and further improving system safety and heat dissipation; ④ It improves system maintainability; when one module needs repair or replacement, it will not be affected by interference from the other module.

[0046] It should be noted that, because this application adopts a dual-input structure, considering the principles of cable accessory classification and even distribution, the aforementioned two-to-one grouping pattern is preferred. Alternatively, based on actual installation requirements, the four-circuit cable accessories can be divided into two modules (one and three) to achieve the same effect. Furthermore, when the number of cable accessories is two, three, or five, the grouping design can be applied similarly to ensure the safety and stability within the switchgear. For those skilled in the art, the probability of failure is generally lower when using two- or three-circuit cable accessories, meeting practical needs; therefore, adaptive grouping designs can be made according to actual conditions. In practice, cable accessory installation structures with five or more circuits are generally not used.

[0047] In one embodiment of this application, such as Figure 7 As shown, the switch cabinet 1 also includes an incoming line cabinet 101, which is arranged side by side with the switch cabinet. The first incoming line accessory 601 and the second incoming line accessory 602 are installed inside the incoming line cabinet 101; the voltage transformer 2 is installed on the top surface of the incoming line cabinet 101.

[0048] Specifically, such as Figure 3 As shown, an instrument compartment 3 is installed at the top front of both the incoming line cabinet 101 and the switch cabinet (i.e., the circuit breaker cabinet 102); an installation area 4 for installing the voltage transformer 2 and the cable accessory module 7 is formed between the instrument compartment 3 and the top of the incoming line cabinet 101 and the circuit breaker cabinet 102.

[0049] It is understandable that this installation area 4 is inherent to switchgear 1 and is not a structural modification of switchgear 1 made to accommodate the design described above. In other words, the existing installation area 4 is used to adapt the installation design for voltage transformer 2 and cable accessory module 7. Of course, the original strength at the top of the line-in cabinet 101 and circuit breaker cabinet 102 may be insufficient; therefore, in actual installation, an adaptive frame is installed at the top "skeleton" of switchgear 1 to meet the strength requirements.

[0050] The installation position of the cable accessories that originally connected to the two incoming cables 10 remains unchanged. In the original design, the voltage transformer 2 was installed at the bottom of the incoming cabinet 101, while the improved design places the voltage transformer 2 at the top of the incoming cabinet 101. This is done to facilitate connection with the cable accessory module 7 and improve cable routing, and also to further enhance the space utilization and heat dissipation within the incoming cabinet 101.

[0051] Further optimization, such as 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] Finally, it should be noted that this utility model mainly focuses on the improved design of the incoming line cabinet 101. Doubly fed generator sets typically use 150mm diameter to save production costs. 2 A dual-cable input / output scheme.

[0061] 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.

[0062] 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.

[0063] 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:

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] It should be added that, if we disregard the space constraints of the switchgear 1 being used inside a wind turbine tower in this application, the installation position of the cable accessory module 2 7 described above can actually be in various other ways. Specific embodiments are provided below for illustration:

[0072] Method 1: Cable accessory module 27 is installed on other sides of the switch cabinet, such as the rear or bottom side. This can effectively isolate and classify the two sets of cable accessory modules, thereby avoiding mutual interference between cable accessories and improving the safety and convenience of later maintenance of cable accessories.

[0073] Method 2: Cable accessory module 2 (7) and cable accessory module 1 (6) are installed on the same side of the switch cabinet, but at different heights. Specifically, the original position of cable accessory module 1 (6) remains unchanged, and cable accessory module 2 (7) is installed above cable accessory module 1 (6). At this time, voltage transformer 2 can be installed on the top surface of the switch cabinet (i.e., circuit breaker cabinet 102).

[0074] It should be noted that the above two methods require significant modifications to the structure and wiring diagram of switch cabinet 1, and may also result in large bends in the cables. This not only increases the difficulty of installation, but may also cause the cables to wear or break during long-term use, thus affecting the normal operation of the entire system; therefore, the design can be made according to the actual situation.

[0075] 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 mounting structure for switchgear, characterized in that, include: A switch cabinet and a switchgear installed inside the switch cabinet, characterized in that: it further includes a plurality of pluggable cable accessories, the plurality of pluggable cable accessories being 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; cable accessory module two is installed on the side of the switch cabinet and at a different installation height from cable accessory module one, or cable accessory module two is installed on other sides of the switch cabinet, and cable accessory module two forms a circuit with the switchgear.

2. The cable accessory installation structure for switchgear as described in claim 1, characterized in that: The switchgear adopts a dual-cable inlet and outlet circuit. The first cable accessory module includes a first inlet accessory and a second inlet accessory, which are respectively connected to two inlet cables. The second cable accessory module 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.

3. The cable accessory installation structure for switchgear as described in claim 2, characterized in that: 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, and the second cable accessory module is installed on the top surface of the switch cabinet.

4. The cable accessory installation structure for switchgear as described in claim 2, characterized in that: 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 switch cabinet, and the second cable accessory module is installed on the side of the switch cabinet and located above the first cable accessory module.

5. The cable accessory installation structure for switchgear as described in claim 3, 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.

6. The cable accessory installation structure for switchgear as described in claim 5, characterized in that: An instrument compartment is installed on the front of the top surface of the switch cabinet, and the instrument compartment and the top surface of the switch cabinet form an installation area for installing the voltage transformer and the second cable accessory module.

7. The cable accessory mounting structure for switchgear as described in claim 6, characterized in that: 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.

8. The cable accessory mounting structure for switchgear as described in claim 7, 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.

9. The cable accessory mounting structure for switchgear as described in claim 8, 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.

10. The cable accessory mounting structure for switchgear as described in claim 3, 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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