Cable accessory installation system for switch cabinet

Abstract

The invention discloses a cable accessory installation system for a switch cabinet, which comprises a switch cabinet body and switch equipment installed in the switch cabinet body, and further comprises a plurality of plug-in cable accessories divided into two groups, namely a cable accessory module I and a cable accessory module II, the first cable accessory module is installed on the side face of the switch cabinet body and connected with the switch equipment to form a loop, and the second cable accessory module is installed on the top face of the switch cabinet body and connected with the switch equipment to form a loop. The cable accessory module has the beneficial effects that the plurality of cable accessories are divided into two groups, so that the length of each cable accessory module can be effectively shortened, that is, the number of times of installation of the cable accessories is reduced, the problem that the cable accessories are burnt nearby is greatly reduced, and the safety and stability of operation of the switch cabinet are improved.

Description

Technical Field

[0001] This application relates to the technical field of switch cabinets, and in particular to a cable accessory installation system for switch cabinets. Background Art

[0002] Power cable accessories are products that connect cables to power transmission and distribution lines and related power distribution devices. Of course, in the power system, (plug-and-play) cable accessories are an important part of the cable line, and their advantages are mainly reflected in the following aspects: (1) Sealing and protection: Cable accessories can effectively seal the cable ends or connections, preventing the intrusion of moisture, dust, chemical substances, etc., and avoiding the decline of insulation performance or short-circuit faults; (2) Mechanical protection: Provide mechanical support and tensile strength, reduce the damage of external forces (such as vibration, bending) to the cable, and extend the cable life; (3) Simplify installation and maintenance: It is convenient to disassemble and install, reducing on-site construction time, and can adapt to different cable types and specifications, flexibly coping with complex laying environments.

[0003] In the existing solutions, as Figure 4 shown, the plug-and-play cable accessories adopt a multi-loop installation structure, that is, multiple cable accessories are plugged in sequence. However, a large number of cases of burning near the cable heads have occurred during the operation of this solution. Therefore, how to further improve the installation of cable accessories in the existing switch cabinets so that the switch cabinets can ensure the safety and stability during operation is an urgent problem to be solved by those skilled in the art. Summary of the Invention

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

[0005] To achieve the above purpose, the technical solution adopted in this application is: A cable accessory installation system for switch cabinets, including a switch cabinet body and switch equipment installed in the switch cabinet body, and further including a plurality of plug-and-play cable accessories. The plurality of plug-and-play cable accessories are divided into two groups, namely cable accessory module one and cable accessory module two. The cable accessory module one is installed on the side of the switch cabinet body and connected to the switch equipment to form a circuit, and the cable accessory module two is installed on the top surface of the switch cabinet body and connected to the switch equipment to form a circuit.

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

[0007] Preferably, the switchgear cabinet further includes 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 to be plugged 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 lightning arrester accessory are arranged to be plugged and unplugged in the vertical direction, and the joint assembly extends in the 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 switchgear cabinet, and an installation area for installing the voltage transformer and the cable accessory module two is formed between the instrument room and the top surface of the switchgear cabinet.

[0010] Preferably, a housing for protecting the voltage transformer and the cable accessory module two is installed at the top end of the switchgear cabinet, and the projection of the housing in the vertical direction completely coincides with the projection of the switchgear cabinet in the vertical direction.

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

[0012] Preferably, a wire hole is arranged on the bottom surface of the incoming line cabinet body 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.

[0013] Preferably, a pair of cable clamps are arranged inside 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 neatly arranged.

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

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

[0016] (1) In the present invention, multiple cable accessories are divided into two groups, which can effectively shorten the length of each cable accessory module, that is, reduce the installation times of the cable accessories, and thus greatly reduce the problem of burning near the cable accessories, and improve the safety and stability of the operation of the switchgear cabinet.

[0017] (2) The present invention installs two sets of cable accessory modules at different positions in the switch cabinet, making it more convenient to install or disassemble the two sets of cable accessory modules. For example, when a certain module needs to be repaired or replaced, it will not be affected by the interference of the other module; of course, it can also reduce the mutual influence between the two sets of cable accessory modules, such as the influence of the cable arrangement between the two and the superposition influence of heat dissipation, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is the primary wiring diagram of the switch cabinet in the existing solution.

[0019] Figure 2 FIG. is the overall structure schematic diagram of the switch cabinet in the existing solution.

[0020] Figure 3 FIG. is the internal structure schematic diagram of the incoming line cabinet in the existing solution.

[0021] Figure 4 FIG. is the schematic diagram of the four-circuit installation structure of the existing cable accessories.

[0022] Figure 5 FIG. is the primary wiring diagram of the switch cabinet of the present invention.

[0023] Figure 6 FIG. is the overall structure schematic diagram of the switch cabinet of the present invention.

[0024] Figure 7 FIG. is the internal structure schematic diagram of the incoming line cabinet of the present invention.

[0025] Figure 8 For the present invention Figure 7 front view structure schematic diagram.

[0026] Figure 9 FIG. is the specific structure schematic diagram of two sets of cable accessory modules of the present invention.

[0027] In the figure: 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. Inlet and outlet 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. Lightning arrester accessory; 8. Cable clamp; 9. Support frame; 10. Incoming line cable; 11. Housing; 12. Resonant suppressor; 13. Joint assembly; 14. Bar; 15. Installation hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, in combination with the specific embodiments, the present application will be further described. It should be noted that, on the premise of non-conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0029] In the description of the present application, it should be noted that for orientation terms, such as the terms "center", "horizontal", "vertical", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation and positional relationship are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present application.

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

[0031] I. Background description:

[0032] ① As the core component of a variable-speed constant-frequency system, the doubly-fed wind turbine generator is a key technical equipment for realizing localization. It adopts a wound-rotor induction generator structure, consisting of a motor body composed of a stator, a rotor, and a bearing system, and a system including three cooling methods: water cooling, air-air cooling, and air-water cooling.

[0033] ② Variable-speed operation can maximize the absorption of wind energy and improve efficiency. The large-capacity variable-speed constant-frequency system is the mainstream direction of wind power technology, and the units using doubly-fed induction generators still dominate. The doubly-fed generator adopts a structure in which the stator is directly connected to the power grid and the rotor is connected to the power grid through a converter. By automatically adjusting the rotor power parameters (frequency / voltage / amplitude / phase) through the frequency converter, constant-frequency power generation within a wide speed range can be achieved. The "flexible connection" system based on AC excitation technology can dynamically adjust the excitation current according to the grid state and speed, accurately control the output power quality, and meet the load and grid connection requirements.

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

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

[0036] The stator side capacity of the doubly-fed unit accounts for more than 80% of the total unit capacity. When the stator voltage is increased to 10 kV, the cost savings on the stator side and the grid side of the unit are particularly prominent, which has obvious advantages for the competitiveness of wind turbines.

[0037] 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.

[0038] Further analyze the problems that occur in the actual use of existing plug-in cable accessories:

[0039] 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. However, a large number of cases of burning near the cable heads have occurred in the operation of this scheme. 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 increases the resistance and heat generation, ultimately leading to the burning near the cable heads;

[0040] 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 switchgear 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 switchgear 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 switchgear to form a circuit.

[0041] It can be understood that dividing the cable accessories installed in a multi-circuit integral manner in the prior art into two groups and installing them on the side and the 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.

[0042] In addition, by dividing the cable accessory module into two groups and installing them at different positions on the switch cabinet body, the layout of the switch cabinet can be optimized, making the installation and maintenance of cable accessories 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 is electrically connected to the switchgear to form a circuit is common knowledge known to those skilled in the art, so it will not be elaborated in detail here. And the above-mentioned switch cabinet body includes a circuit breaker cabinet body 102 and a grid-connected contactor cabinet body 103.

[0044] In this embodiment, as Figure 3 and Figure 4 shown, the switch cabinet 1 in this application adopts a double-cable incoming and outgoing line circuit, and the switch cabinet 1 also includes a voltage transformer 2; thus, a cable accessory with a four-circuit structure is required to meet the actual needs: that is, two incoming line cables 10 plus the connection cable to the voltage transformer 2 plus the lightning arrester. Therefore, four cable accessories are taken as examples in this application for detailed description.

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

[0046] It can be seen that by grouping the cable accessories with the original four-circuit structure in pairs to form two independent modules, the advantages of such a design are as follows: ① reducing the number of installation circuits of cable accessories and reducing the failure problems caused by installing too many cable accessories; ② effectively utilizing the top space of the switch cabinet body by installing the cable accessory module two 7 on the top side of the switch cabinet body, avoiding installation difficulties caused by insufficient space; ③ by installing the cable accessory module one 6 and the cable accessory module two 7 at different positions on the switch cabinet body, the distribution of cable accessories is more reasonable, reducing the mutual influence between cable accessories, and further improving the safety and heat dissipation of the system. ④ improving the maintainability of the system; when a certain module needs to be repaired or replaced, it will not be interfered by the other module.

[0047] It should be noted that; since the present application adopts a double-incoming line structure, therefore, under the principle of considering the classification of cable accessories and uniform distribution, it is preferably to adopt the above-mentioned grouping mode of two by two. Of course, based on the actual installation requirements, the four-circuit cable accessories described above can also be divided into two modules, namely module 1 and module 3, and thus the above-mentioned effects can also be achieved. In addition, when the number of cable accessories adopts a structure of two circuits, three circuits or five circuits, etc., by analogy, they can all be designed in a grouped manner, so as to ensure the safety and stability inside the switchgear. For those skilled in the art, generally when using cable accessories with two-circuit and three-circuit structures, the probability of failure is relatively small, and it can meet the actual requirements. Therefore, adaptive grouped design can be carried out according to the actual situation; in actual situations, generally, a cable accessory installation structure with five circuits or more than five circuits will not be adopted.

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

[0049] Specifically, as Figure 3 shown, instrument rooms 3 are installed at the front side positions at the tops of the incoming line cabinet body 101 and the switch cabinet body (i.e., the circuit breaker cabinet body 102); an installation area 4 for installing the voltage transformer 2 and the cable accessory module two 7 is formed between the instrument rooms 3 and the tops 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 in the switchgear 1 itself, and the structure of the switchgear 1 is not improved to adapt to the above-mentioned design. That is to say, the voltage transformer 2 and the cable accessory module two 7 are adaptively installed and designed by using the existing installation area 4. Of course, the strength at the tops of the original incoming line cabinet body 101 and the circuit breaker cabinet body 102 may not be sufficient; therefore, during actual installation, a frame can be adaptively installed at the "skeleton" at the top of the switchgear 1 to meet the strength requirements.

[0051] And the installation positions of the cable accessories originally connected to the two incoming line cables 10 remain unchanged. In the original scheme, the voltage transformer 2 was installed at the inner bottom position of the incoming line cabinet body 101, while in the improved design, the voltage transformer 2 is installed at the top position of the incoming line cabinet body 101. On the one hand, this is to cooperate with the cable accessory module two 7 for connection to facilitate wiring; on the other hand, it also further improves the space utilization rate and heat dissipation effect inside the incoming line cabinet body 101.

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

[0053] As Figure 7 and Figure 8 shown, for the cable accessory module one 6, a wire hole is provided on the bottom surface of the incoming line cabinet body 101 corresponding to the lower part of the cable accessory module one 6. The incoming line cable 10 enters through the wire hole and is connected to the first incoming line accessory 601 and the second incoming line accessory 602, so that the incoming line cable 10 passing through the wire hole is in a vertical state. This avoids a large bending angle of the incoming line cable 10 in the horizontal direction, thus ensuring the stability and safety of the incoming line cable 10 during use. At the same time, the setting of the wire hole also makes the routing of the incoming line cable 10 more neat and clear, improving the aesthetics of the entire switch cabinet 1.

[0054] Of course, a pair of cable clamps 8 can be provided in the incoming line cabinet body 101. The cable clamps 8 can limit and fix the two incoming line cables 10, so that the incoming line cables 10 are neatly arranged, and at the same time, it also avoids the situation of shaking or falling off of the incoming line cables 10 during use, further improving the connection stability and safety of the incoming line cables 10.

[0055] As Figure 9 shown, for the cable accessory module two 7, the length directions of the voltage transformer accessory 701, the lightning arrester accessory 702, and the joint assembly 13 are all parallel to the length direction of the switch cabinet 1. On the one hand, this is to minimize the bending of the connecting cables, and on the other hand, this is also considered based on the installation space on the circuit breaker cabinet body 102.

[0056] In this embodiment, as Figure 9 shown, an installation hole 15 is opened on the top surface of the switch cabinet body (i.e., the circuit breaker cabinet body 102), and an incoming and outgoing line bushing 5 is installed in the installation hole 15. The incoming and outgoing line bushing 5 is connected and cooperated with the cable accessory module two 7. Of course, in the original design, the side surface of the circuit breaker cabinet body 102 also has an installation hole 15 opened and an incoming and outgoing line bushing 5 is installed, so that the incoming and outgoing line bushing 5 is connected and cooperated with the corresponding cable accessory module one 6. It can be clearly seen that almost no change is made to the structure of the original switch cabinet 1. Only by changing the installation positions of the cable accessories and the installation position of the voltage transformer 2, the improvement of the problems in the prior art is achieved. The operation is simple, the cost is low, and it is convenient for popularization and use. At the same time, such a design also makes the layout of the entire switch cabinet 1 more reasonable, the installation more convenient, and improves the safety and stability of the system.

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

[0058] Further preferably, as Figure 9 shown, in order to improve the partition between the incoming and outgoing line bushings 5 at the top of the circuit breaker cabinet 102, partition bars 14 are installed at intervals at the top of the circuit breaker cabinet 102. The partition bars 14 can form multiple isolation zones at the top of the circuit breaker cabinet 102, and the incoming and outgoing line bushings 5 are installed in the corresponding isolation zones, so that the incoming and outgoing line bushings 5 do not affect each other, improving the stability and safety of the cable accessory installation system.

[0059] Further preferably, as Figure 6 shown, in order to improve the protection of the voltage transformer 2, a housing 11 can be installed at the top of the switchgear cabinet 1, that is, the housing 11 can cover the voltage transformer 2 and the cable accessory module two 7. And the housing 11 needs to meet the following conditions: the projection of the housing 11 in the vertical direction completely coincides with the projection of the switchgear cabinet 1 in the vertical direction. That is to say, the housing 11 cannot extend out of the switchgear cabinet 1 in the horizontal direction, which can avoid interference with the original placement position of the switchgear cabinet 1; and the height of the housing 11 is not specifically limited in the height direction, that is, it can be set according to the actual situation.

[0060] Further preferably, a harmonic eliminator 12 can be installed at the top of the incoming line cabinet 101, and the harmonic eliminator 12 is connected to the voltage transformer 2 in cooperation. It can be understood that the cooperation between the voltage transformer 2 and the harmonic eliminator 12 is a key measure for the safe operation of the power system. By suppressing ferromagnetic resonance, limiting overvoltage and overcurrent, it ensures the long-term stable operation of the voltage transformer 2, and at the same time maintains the power quality and power supply reliability of the power grid.

[0061] Finally, it should be noted that the present invention is mainly an improved design for the incoming line cabinet 101. The doubly-fed generator set usually adopts a double-cable incoming and outgoing line scheme of 150mm 2 for cost savings.

[0062] Original scheme: As Figures 1 to 4 shown, components such as a voltage transformer 2 (PT) and a lightning arrester accessory 702 need to be installed in the incoming line cabinet 101; that is, the first incoming line accessory 601 + the second incoming line accessory 602 + the voltage transformer accessory 701 + the lightning arrester accessory 702. There have been a large number of cases of burning near the cable heads in this scheme during operation; and due to the space limitation in the fan tower, the size of the switchgear cabinet 1 cannot be made larger, so the wiring in the incoming line cabinet 101 is also very difficult to connect.

[0063] Improved solution: As Figures 5 to 9 shown, on the basis of a 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 originally placed 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, and at the same time, the rear-mounted lightning arrester accessory 702 is also moved to the top. After adopting the improved solution, each set of incoming and outgoing line bushings 5 is only connected to two circuits, greatly improving the operating reliability of the switchgear 1. At the same time, the incoming line cable 10 in the incoming line cabinet 101 can be directly introduced straight from the bottom of the cabinet, which also improves the reliability of the switchgear 1. The cable connection is also more convenient.

[0064] To further understand the beneficial effects brought by the improved design. As Figure 3 shown, it is the original solution, in which there are three groups of integral four-circuit structure cable accessories, and each group has two incoming line cables 10. Since there are three phases, there are six incoming line cables 10 located in the incoming line cabinet 101. As Figure 7 shown, it is the improved solution. It can be clearly seen from the two figures that:

[0065] ① Divide the originally integral four-circuit structure cable accessories into two-circuit structures in pairs of two. The rationalized design reduces the number of installation circuits, thereby improving the system stability.

[0066] ② Since the cable accessory module two 7 is installed on the top side of the circuit breaker cabinet 102, that is, the cable accessory module two 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 becoming larger due to the action of gravity, and greatly improves the stability during installation.

[0067] ③ Install the voltage transformer 2 at the top of the incoming line cabinet 101, which will provide a clearance space for the installation and routing of the incoming line cable 10 in the cable accessory module one 6, enabling the incoming line cable 10 to minimize bending during cable routing. We know that the incoming line cable 10 itself has a certain strength, so bending will generate a certain stress. Under the long-term action of stress, problems such as fatigue and even fracture of the cable are likely to occur. Therefore, reducing the bending of the cable can effectively improve the service life of the cable and the safety of the entire system.

[0068] ④ In the original solution, many groups (more than two groups) of cable clamps 8 need to be set, as Figure 3 shown, which is caused by the bending layout design of the incoming line cable 10 and the cable connected to the voltage transformer 2. However, only one pair needs to be set in the improved solution to achieve an orderly layout, and at the same time, the installation convenience is also improved.

[0069] ⑤The voltage transformer 2 and the cable accessory module II 7 are installed at the top. On the one hand, it improves the space utilization rate in the incoming line cabinet 101 and reduces the mutual interference between electrical components. On the other hand, after the electrical components are installed separately, combined with the orderly and less-bending design of the lines, the heat generation in the incoming line cabinet 101 can be greatly reduced, the heat dissipation space in the incoming line cabinet 101 can be increased, and the overall heat dissipation performance of the switch cabinet 1 can be improved.

[0070] ⑥The four-circuit cable accessories in the original scheme are inconvenient for installation and subsequent maintenance. The reasons are as follows: As Figure 3 shown, due to its long horizontal length, during actual installation, a support frame 9 generally needs to be installed at the bottom of the last lightning arrester accessory 702 to support it. This requires the installation and disassembly of the support frame 9, which is very inconvenient. At the same time, the design of the support frame 9 not only increases the cost but also occupies the space in the incoming line cabinet 101. The improved pair of two-circuit cable accessories fully meet the usage requirements, that is, there is no need to install the support frame 9, so subsequent installation and maintenance are more convenient.

[0071] In summary, the design of this application only adds a protective housing 11 to the switch cabinet 1 and makes some punching designs, that is, according to the installation areas 4 existing at the tops of the incoming line cabinet 101 and the circuit breaker cabinet 102, the voltage transformer 2 is installed at the top, making full use of the structural characteristics of the switch cabinet 1 itself. It can be said that there is almost no modification to the structure of the switch cabinet 1 itself. Of course, as Figure 1 and Figure 5 can also be seen, the primary wiring diagram of the switch cabinet 1 is also adjusted adaptively, which not only reduces the production cost but also improves the convenience of disassembly and assembly, the convenience during subsequent maintenance, the better heat dissipation performance of the switch cabinet 1, and reduces the mutual interference between electrical components and other beneficial effects.

[0072] The above describes the basic principle, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of this application. Without departing from the spirit and scope of this application, this application will have various changes and improvements, and these changes and improvements all fall within the scope of this application claimed. 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 cabinet, comprising a switchgear cabinet body and a switching device installed in the switchgear cabinet body, characterized in that: It also includes a plurality of pluggable cable accessories. The plurality of pluggable cable accessories are divided into two groups, namely 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 switching device to form a loop. Cable accessory module two is installed on the top surface of the switch cabinet body and connected to the switching device to form a loop.

2. The cable accessory installation system for switchgear as described in claim 1, characterized in that: The switch cabinet adopts a double-cable incoming and outgoing line loop. Cable accessory module one includes a first incoming line accessory and a second incoming line accessory, and the first incoming line accessory and the second incoming line accessory are respectively connected to two incoming line cables. Cable accessory module two includes a voltage transformer accessory and a lightning arrester accessory. The switch cabinet also includes a voltage transformer. The voltage transformer accessory is connected to the voltage transformer through a joint assembly, and the lightning arrester accessory has a lightning arrester function.

3. The cable accessory installation system for switchgear as described in claim 2, characterized in that: The switch cabinet also includes an incoming line cabinet body, and 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.

4. The cable accessory installation system for switchgear as described in claim 3, characterized in that: The first incoming line accessory and the second incoming line accessory are arranged to be pluggable 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 lightning arrester accessory are arranged to be pluggable in the vertical direction, and the joint assembly extends in the horizontal direction and connects the voltage transformer accessory and the voltage transformer.

5. The cable accessory installation system for switchgear as claimed in claim 3 or 4, characterized in that: 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 cable accessory module two is formed between the instrument room and the top surface of the switch cabinet.

6. The cable accessory installation system for switchgear as claimed in claim 5, wherein: A housing for protecting the voltage transformer and cable accessory module two is installed at the top end of the switch cabinet, and the projection of the housing in the vertical direction completely coincides with the projection of the switch cabinet in the vertical direction.

7. The cable accessory installation system for switchgear as described in claim 5, characterized in that: An installation hole is formed on the top surface of the switch cabinet body, and an incoming and outgoing line bushing is installed in the installation hole. The incoming and outgoing line bushing is connected and matched with cable accessory module two.

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

9. The cable accessory installation system for a switchgear cabinet according to claim 8, wherein: A pair of cable clamps are arranged inside the incoming line cabinet body, and the cable clamps are suitable for limiting and fixing the incoming line cable to make the incoming line cable neatly arranged.

10. The cable accessory installation system for switchgear as described in claim 3, characterized in that: A harmonic eliminator is installed on the top surface of the incoming line cabinet body, and the harmonic eliminator is connected and matched with the voltage transformer.

Images