Switchgear with a top-mounted contact box

Abstract

A switchgear with a top-mounted contact box, which includes a circuit breaker compartment, a busbar compartment and a cable compartment. By respectively arranging a first contact box and a second contact box above the circuit breaker compartment, the internal heat dissipation problem of the air-insulated metal-enclosed switchgear is solved, and a new type of switchgear with an obviously visible isolating break and miniaturization is provided according to this method. Since the top-mounted scheme of the contact box in the circuit breaker compartment is adopted in this patent, most of the main components and conductors inside the cable compartment and the busbar compartment of this switchgear are arranged above the contact box. When the switchgear is in operation, the heat generated by it will rise, having less impact on the contact box. And the branch bars inside it are connected to the contact box, which is a conduction heat dissipation device for the contact box and can further accelerate the heat dissipation of the contact box. At the same time, the vertical layout of the contact box also enables the heat generated by the moving contact and the static contact in the contact box to be convectively released quickly and conveniently.

Description

Technical Field

[0001] This patent relates to the field of high-voltage electrical appliances, and particularly to a switchgear with a top-mounted contact box. Background Art

[0002] At present, medium-voltage air-insulated metal-enclosed switchgears are mainly divided into fixed type and draw-out type. For the fixed type of air-insulated metal-enclosed switchgear, a disconnector needs to be equipped to isolate the power supply during maintenance; for the draw-out type of air-insulated metal-enclosed switchgear, a disconnection gap can be formed between the opened contacts by moving the main switch.

[0003] Refer to Figure 7 For the shown existing switchgear, most of the contact boxes of the existing switchgear are horizontally arranged, which not only makes it difficult to discharge the heat generated by the contact box itself, but also the heat generated by heat-generating components such as current transformers inside the cable chamber will increase the temperature of the contact box. If the contact box operates at a relatively high temperature, it will not only cause an increase in the contact resistance of conductive components such as static contacts and moving contacts inside the contact box, but also accelerate the aging of the contact box, thus evolving into a potential hazard point and catalyst for numerous accidents of the switchgear.

[0004] In addition, the existing air-insulated metal-enclosed switchgears are large in size and high in height, and are not easy to transport and install in some special places, such as small spaces like ships. In addition, the main switches of the vast majority of draw-out air-insulated metal-enclosed switchgears on the market move horizontally. When it is rocked into the working position, the relative positions of the shutter and the moving contact cannot be clearly observed, sometimes collisions will occur, and even faults will occur; when it is rocked out to the test position, the visible disconnection gap cannot be observed, and only the relative position can be used to judge. Sometimes, if the shutter is not reset or damaged, it will pose a safety hazard to maintenance. Summary of the Invention

[0005] The purpose of this patent is to overcome the defects of the prior art and provide a new type of switchgear with good heat dissipation, visible disconnection gap, and miniaturization.

[0006] To achieve the above purpose, this patent adopts the following technical solutions:

[0007] A switchgear with a top-mounted contact box, which includes a circuit breaker chamber, a busbar chamber, and a cable chamber. The busbar chamber is arranged on the top side of the circuit breaker chamber, and the cable chamber is located on the top side of the circuit breaker chamber and adjacent to the busbar chamber. A vertical first contact box and a second contact box are respectively arranged in the cable chamber and the busbar chamber. The top parts of the static contacts in the first contact box and the second contact box are respectively connected to the branch buses in the cable chamber and the busbar chamber, and the bottom parts of the static contacts in the first contact box and the second contact box are respectively opposite to the lower circuit breaker chamber; A lifting mechanism and a main switch body installed on the lifting mechanism are arranged in the circuit breaker chamber. The main switch body includes a first moving contact, a second moving contact, and a circuit breaker. The first moving contact and the second moving contact are connected by the circuit breaker. The first moving contact and the second moving contact are respectively arranged below the first contact box and the second contact box. The lifting mechanism can drive the first moving contact and the second moving contact to move vertically upward to contact the static contacts in the first contact box and the second contact box respectively.

[0008] Preferably, valves are respectively arranged in the circuit breaker chamber corresponding to between the first moving contact and the first contact box, and between the second contact box and the second moving contact. An observation window with the same height as the valve is arranged on the front door of the circuit breaker chamber.

[0009] Preferably, the relatively arranged first contact box and the first moving contact form a first contact mechanism, the relatively arranged second contact box and the second moving contact form a second contact mechanism, the first contact mechanism and the second contact mechanism form a contact system, and multiple contact systems are arranged in parallel in the width direction of the switchgear with a top-mounted contact box.

[0010] Preferably, a low-voltage chamber is arranged on one side of the busbar chamber away from the cable chamber.

[0011] Preferably, a plurality of heat dissipation holes are respectively arranged on the tops of the cable chamber and the busbar chamber.

[0012] Preferably, the cable chamber is in an L-shaped structure, its bottom is correspondingly arranged on one side of the circuit breaker chamber, the top extends above the circuit breaker chamber, a current transformer and an earthing switch are arranged on the top of the cable chamber, and the current transformer and the earthing switch are located above the first contact box.

[0013] Preferably, the lifting mechanism is installed on a chassis truck, and the main switch body, the lifting mechanism, and the chassis truck are of an integral structure.

[0014] Preferably, the lifting mechanism includes a base and a telescopic mechanism arranged above the base and connected to a driving mechanism. The telescopic mechanism includes a top plate arranged opposite to the bottom plate, and two cross-shaped top rods arranged between the top plate and the bottom plate. The bottom plate is connected to the base, the top plate is connected to the first moving contact, the second moving contact, and the circuit breaker. The middle parts of the two top rods are hinged, the top ends of the two top rods are respectively in sliding fit with the top plate, and the bottom ends of the two top rods are respectively in sliding fit with the bottom plate.

[0015] Preferably, the circuit breaker includes a support base, an operating mechanism disposed on one side of the support base, and a connecting mechanism connected to the operating mechanism. The first moving contact and the second moving contact are respectively installed on the support base. The operating mechanism can drive the connecting mechanism to contact and separate from the first moving contact and the second moving contact respectively; the height of the operating mechanism is higher than that of the support base. The support base is located at the top on one side of the operating mechanism. The bottom of the support base is connected to the lifting mechanism through a support insulator. A pole column connected between two outgoing terminals is provided on the top side of the support base.

[0016] Preferably, three pairs of outgoing terminals corresponding to three groups of contact systems are provided on the support base. One end of each pair of outgoing terminals is respectively connected to the first moving contact and the second moving contact of the corresponding contact system. The other end of each pair of outgoing terminals is respectively matched with the corresponding connecting mechanism; the operating mechanism includes a first connecting rod, a second connecting rod, a third connecting rod and a driving gear connected in sequence. The third connecting rod is eccentrically connected to the driving gear, and the first connecting rod is connected to the connecting mechanism.

[0017] For the switchgear with overhead contact boxes in this patent, by respectively arranging the first contact box in the cable chamber and the second contact box in the bus chamber above the circuit breaker chamber, the heat generated when the second contact box and the first contact box are connected is discharged through the bus chamber and the cable chamber respectively. There will be no situation where when the second contact box and the first contact box are horizontally arranged, the two ends of the second contact box and the first contact box are respectively located in two different chambers, avoiding the heat concentration in one chamber when the heat dissipation at both ends of the second contact box and the first contact box is uneven, which can effectively improve the heat dissipation performance. Moreover, the heat generated by the second contact box and the first contact box in this patent does not need to be discharged through the circuit breaker chamber, which can avoid increasing the temperature in the circuit breaker chamber and has higher reliability.

[0018] In addition, there is no need to arrange the first contact box or the second contact box on the side of the circuit breaker chamber, which can not only reduce the lateral dimension of the air-insulated metal-enclosed switchgear and the floor area, but also when the lifting mechanism drives the first moving contact group and the second moving contact group to move vertically upward to contact the first contact box and the second contact box respectively, the first moving contact group and the second moving contact group are clamped above the lifting mechanism and between the first contact box and the second contact box, and the contact is more reliable.

[0019] In addition, through the observation window, the isolation break of the main circuit can be clearly observed, which can not only ensure maintenance when the shutter is closed, guarantee the safety during maintenance, but also avoid faults caused by the collision between the shutter and the main switch body.

[0020] In addition, since the pole column of the circuit breaker is arranged parallel to the width direction of the air-insulated metal-enclosed switchgear, that is, the pole column of the circuit breaker is horizontally arranged, the height of the overall equipment is reduced, making it more convenient to be applied to low spaces, such as inside ships, etc.

[0021] In addition, the main switch body, the lifting mechanism and its chassis truck are of an integral structure, and the vertical movement of the chassis truck drives the switching of the main switch body between the test position and the working position. When the lifting mechanism is in the retracted state (test position), the entire main switch can be freely moved out of the switchgear without the need for an additional transfer trolley, which is convenient and time-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the front view of the switchgear according to the embodiment of the present patent;

[0023] Figure 2 is the embodiment of the present patent Figure 1 sectional view;

[0024] Figure 3 is the embodiment of the present patent Figure 2 another sectional view;

[0025] Figure 4 is the schematic structural diagram of the first moving contact group and the second moving contact group according to the embodiment of the present patent;

[0026] Figure 5 is the sectional view of the main switch body according to the embodiment of the present patent;

[0027] Figure 6 is the temperature rise air flow route diagram according to the embodiment of the present patent;

[0028] Figure 7 is the temperature rise air flow route diagram of the prior art. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following, in combination with the embodiments given Figures 1 to 7 further describes the specific embodiments of the switchgear with a top-mounted contact box of the present patent. The switchgear with a top-mounted contact box of the present patent is not limited to the description of the following embodiments.

[0030] Since the present patent adopts the top-mounted scheme of the contact box in the circuit breaker compartment, the main components and conductors inside the cable compartment 3 and the bus compartment 2 of the present air-insulated metal-enclosed switchgear are mostly arranged above the contact box. When the switchgear is in operation, the heat generated by it will rise, and the influence on the contact box is relatively small. Moreover, the branch row inside it is connected to the contact box, which is a conduction heat dissipation device for the contact box and can further accelerate the heat dissipation of the contact box. At the same time, the vertical layout of the contact box also enables the heat generated by the moving contacts and the static contacts in the contact box to be convectively released quickly and conveniently.

[0031] As Figures 1-2 shown, the switchgear with a top-mounted contact box of this patent includes a circuit breaker chamber 1, a busbar chamber 2, and a cable chamber 3. The busbar chamber 2 is arranged on the top side of the circuit breaker chamber 1, and the cable chamber 3 is located on the top side of the circuit breaker chamber 1 and adjacent to the busbar chamber 2. Vertical first contact boxes 31 and second contact boxes 21 are respectively provided in the cable chamber 3 and the busbar chamber 2. The top parts of the static contacts in the first contact boxes 31 and the second contact boxes 21 are respectively connected to the branch buses in the cable chamber 3 and the busbar chamber 2, and the bottom parts of the static contacts in the first contact boxes 31 and the second contact boxes 21 are respectively opposite to the lower circuit breaker chamber 1;

[0032] An elevating mechanism 14 is provided in the circuit breaker chamber 1, and a main switch body is installed on the elevating mechanism 14. The main switch body includes a first moving contact 11, a second moving contact 12, and a circuit breaker 13. The first moving contact 11 and the second moving contact 12 are connected by a pole column 15 and then connected to the circuit breaker 13. The first moving contact 11 and the second moving contact 12 are respectively arranged below the first contact box 31 and the second contact box 21. The elevating mechanism 14 can drive the first moving contact 11 and the second moving contact 12 to move vertically upward to respectively contact the static contacts in the first contact box 31 and the second contact box 21.

[0033] For the switchgear with a top-mounted contact box of this patent, by respectively arranging the first contact box 31 in the cable chamber 3 and the second contact box 21 in the busbar chamber 2 above the circuit breaker chamber 1, the heat generated when the second contact box 21 and the first contact box 31 are connected is respectively discharged through the busbar chamber 2 and the cable chamber 3. There will be no situation where when the second contact box 21 and the first contact box 31 are arranged horizontally, the two ends of the second contact box 21 and the first contact box 31 are respectively located in two different chambers, avoiding the heat being concentrated in one chamber when the heat dissipation at both ends of the second contact box 21 and the first contact box 31 is uneven, which can effectively improve the heat dissipation performance. Moreover, the heat generated by the second contact box 21 and the first contact box 31 of this patent does not need to be discharged through the circuit breaker chamber 1, which can avoid increasing the temperature in the circuit breaker chamber 1 and has higher reliability. In addition, the height H1 of the switchgear with a top-mounted contact box of this patent is smaller than the height H2 of the prior art. It not only has a smaller volume, but also can discharge heat from the shell faster when the heat rises.

[0034] In addition, there is no need to arrange the first contact box 31 or the second contact box 21 on the side of the circuit breaker chamber 1, which can not only reduce the lateral dimension of the air-insulated metal-enclosed switchgear and reduce the floor area, but also when the elevating mechanism drives the first moving contact group and the second moving contact group to move vertically upward to respectively contact the first contact box 31 and the second contact box 21, the first moving contact group and the second moving contact group are clamped between the upper part of the elevating mechanism and the first contact box 31 and the second contact box 21, and the contact is more reliable.

[0035] Further, corresponding to between the first moving contact 11 and the first contact box 31, and between the second contact box 21 and the second moving contact 12 in the circuit breaker chamber 1, shutter doors 6 are respectively provided. The front door of the circuit breaker chamber 1 is provided with an observation window 10 having the same height as the shutter doors 6. The movement of the shutter doors 6 can be realized in various ways, including mechanically and electrically, etc. Through the observation window 10, the states of the circuit breaker 13 and the shutter doors 6 in the circuit breaker chamber 1 can be observed. This not only ensures that maintenance is carried out when the shutter doors are closed, guaranteeing safety during maintenance, but also can avoid faults caused by the collision between the shutter doors and the main switch body.

[0036] As Figure 3 shown, the lifting mechanism 14 vertically rises, pushing the main switch body upward, and at the same time opening the shutter doors 6. Finally, the first moving contact 11 and the second moving contact 12 respectively come into contact and engage with the static contacts in the corresponding first contact box 31 and second contact box 21, reaching the working position. During this process, through the observation window 10, the relative movement of the shutter doors 6 and the main switch body can be clearly observed, preventing faults caused by the collision between the two.

[0037] As Figure 2 shown, the lifting mechanism 14 does not rise, the shutter doors 6 are not opened, and the circuit breaker 13 is in the test position. Through the observation window 10, the isolation break of the main circuit can be clearly observed, ensuring that maintenance is carried out when the shutter doors 6 are closed, guaranteeing safety during maintenance. At this time, when opening the lower cabinet door, the lifting mechanism 14, the first moving contact 11, the second moving contact 12, and the circuit breaker 13 can be moved out of or into the entire main switch. Preferably, the lifting mechanism 14 is installed on the chassis truck 17, and the main switch body, the lifting mechanism 14, and the chassis truck 17 are of an integrated structure. The bottom of the chassis truck is provided with rollers, and the entire main switch can be conveniently moved out of or into by means of the self - contained wheels of the integrated chassis truck.

[0038] As Figures 3-4 shown, the relatively arranged first contact box 31 and the first moving contact 11 constitute the first contact mechanism, the relatively arranged second contact box 21 and the second moving contact 12 constitute the second contact mechanism, the first contact mechanism and the second contact mechanism together constitute a contact system. The first contact box 31 and the second contact box 21 are respectively connected to the cable and the busbar, the first moving contact 11 is connected to the second moving contact 12, and the lifting mechanism 14 can drive the first moving contact 11 and the second moving contact 12 to move vertically along the height direction parallel to the air - insulated metal - enclosed switchgear of this patent, respectively coming into contact with and separating from the corresponding first contact box 31 and second contact box 21. When the first moving contact 11 and the second moving contact 12 respectively come into contact with the corresponding first contact box 31 and second contact box 21, a path is formed between the first contact box 31 and the second contact box 21.

[0039] This embodiment includes three contact systems, but the number of contact systems can also vary according to the actual working environment, and all fall within the protection scope of the present invention.

[0040] This embodiment includes three contact systems arranged in parallel in the width direction of the air-insulated metal-enclosed switchgear. The three contact systems arranged in parallel are perpendicular to the direction in which the lifting mechanism 14 moves out or in. The first contact box 31, the second contact box 21, the first moving contact 11, and the second moving contact 12 of each group of contact systems are all vertically arranged, that is, the height is parallel to the height of the air-insulated metal-enclosed switchgear. By arranging the contact systems parallel to the width direction of the air-insulated metal-enclosed switchgear, not only can the height of the air-insulated metal-enclosed switchgear be reduced, facilitating the air-insulated metal-enclosed switchgear to be more conveniently applicable to low spaces, such as inside a ship, etc., but also when the main circuit is connected and energized, the heat generated inside the first contact box 31 and the second contact box 21 can be conveniently and quickly transferred out from the bottoms of the first contact box 31 and the second contact box 21 respectively, facilitating heat dissipation. Preferably, the first contact box 31 and the second contact box 21 are respectively buckled above their respective static contacts, and heat dissipation holes are respectively provided at the tops of the first contact box 31 and the second contact box 21. Of course, the first contact box 31 and the second contact box 21 can be integral or installed. In addition, the first contact box 31 and the second contact box 21 can also be without heat dissipation holes, and all fall within the protection scope of the present invention.

[0041] As Figure 3 shown, the busbar chamber 2 is provided on the top side of the circuit breaker chamber 1, the cable chamber 3 is located on the top side of the circuit breaker chamber 1 and is adjacent to the busbar chamber 2, and a low-voltage chamber 4 is provided on the other side of the busbar chamber 2 relative to the cable chamber 3. The low-voltage chamber 4 is used to accommodate low-voltage electronic devices such as relays.

[0042] Furthermore, a plurality of heat dissipation holes are respectively provided at the tops of the cable chamber 3 and the busbar chamber 2. This enables the hot air generated when the first contact box 31 and the second contact box 21 arranged parallel to the height direction of the air-insulated metal-enclosed switchgear are connected to be more conveniently discharged upward through the heat dissipation holes, further improving the heat dissipation performance. The heat dissipation holes of the cable chamber 3 can be provided on the side wall of the first cavity 3A or on the side walls of other cavities of the cable chamber 3.

[0043] Referring to Figure 2 the preferred embodiment showing the cable chamber 3, the cable chamber 3 of this preferred embodiment has an L-shaped structure, its bottom is correspondingly provided on one side of the circuit breaker chamber, and the top extends above the circuit breaker chamber. Components such as a current transformer 32 and an earthing switch are provided at the top of the cable chamber 3. The current transformer 32 and the earthing switch are located above the first contact box 31.

[0044] Referring to Figure 5Shows a preferred embodiment of the circuit breaker 13, which includes a support base 131, an operating mechanism 132 disposed on one side of the support base 131, and a connection mechanism 133 connected to the operating mechanism 132. The first moving contact 11 and the second moving contact 12 are respectively installed on the support base 131. The operating mechanism 132 can drive the connection mechanism 133 to contact the first moving contact 11 and the second moving contact 12 respectively, forming a path between the first moving contact 11 and the second moving contact 12. When a fault occurs in the main circuit, the operating mechanism 132 can drive the connection mechanism 133 to separate from the first moving contact 11 and the second moving contact 12 respectively, disconnecting the main circuit to achieve protection.

[0045] Specifically, three pairs of outgoing terminals 16 corresponding to three groups of contact systems are provided on the support base 131. One end of each pair of outgoing terminals 16 is respectively connected to the first moving contact 11 and the second moving contact 12 of the corresponding contact system, and the other end of each pair of outgoing terminals 16 is respectively matched with the corresponding connection mechanism 133. The operating mechanism 132 can drive the connection mechanism 133 to contact and separate from the corresponding two outgoing terminals 16.

[0046] The operating mechanism 132 includes a link mechanism, an energy storage mechanism, and an operating handle. The link mechanism includes at least two link members that are latched together. When the operating handle rotates to the closing position, the link mechanism stores energy for the energy storage mechanism and makes the connection mechanism 133 contact the corresponding outgoing terminal 16. When a fault occurs in the main circuit, the latched link members of the link mechanism are unlatched, losing balance and causing the energy storage mechanism to release energy. The energy storage mechanism drives the link to drive the connection mechanism 133 to separate from the corresponding outgoing terminal 16 to achieve protection. The energy storage mechanism and the unlatched link mechanism of the operating mechanism are prior arts and will not be elaborated here. The main improvement points of the circuit breaker of this patent lie in the layout structure of the support base 131, the connection mechanism 133, the wiring terminal, and the support insulator 1311. The connection mechanism 133 is vertically arranged with the first moving contact 11 and the second moving contact 12, reducing the overall height, and providing insulation and support through the support insulator 1311, which is reliable and stable.

[0047] Specifically, the link mechanism includes a first link 1321, a second link 1322, a third link 1323, and a driving gear 1324 that are connected in sequence. The third link 1323 is eccentrically connected to the driving gear 1324. The first link 1321 is connected to the connection mechanism 133. When the driving gear 1324 rotates, it drives the connection mechanism 133 to act through the third link 1323, the second link 1322, and the first link 1321 in sequence.

[0048] Further, the height of the operating mechanism 132 is higher than that of the support base 131. The support base 131 is located at the top on one side of the operating mechanism 132. The bottom of the support base 131 is connected to the lifting mechanism 14 through a support insulator 1311. A pole column 15 connected between two outgoing terminals 16 is provided on the top side of the support base 131. By means of the support insulator 1311, the top height of the support base 131 is the same as that of the operating mechanism 132, which not only simplifies the structure of the connecting mechanism 133, but also can support the first moving contact 11 and the second moving contact 12, improves the contact pressure, and ensures the reliability of contact.

[0049] Refer to Figures 2-3 Referring to a preferred embodiment of the lifting mechanism 14, the lifting mechanism 14 includes a base 141 and a telescopic mechanism disposed above the base 141 and connected to a driving mechanism. The telescopic mechanism includes a top plate 143 disposed opposite to a bottom plate 142, and two cross-set top rods 144 disposed between the top plate 143 and the bottom plate 142. The bottom plate 142 is connected to the base 141, and the top plate 143 is connected to the first moving contact 11, the second moving contact 12, and the circuit breaker 13. The middle parts of the two top rods 144 are hinged, the top ends of the two top rods 144 are respectively in sliding fit with the top plate 143, and the bottom ends of the two top rods 144 are respectively in sliding fit with the bottom plate 142. Of course, the lifting mechanism 14 can also be implemented in various ways, including mechanical transmission and electrical control, etc. The above content is a further detailed description of this patent in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of this patent is only limited to these descriptions. For those of ordinary skill in the technical field to which this patent pertains, without departing from the concept of this patent, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of this patent.

Claims

1. A switchgear with an overhead contact box, characterized in that: It includes a circuit breaker compartment (1), a busbar compartment (2) and a cable compartment (3). The busbar compartment (2) is arranged on the top side of the circuit breaker compartment (1), and the cable compartment (3) is located on the top side of the circuit breaker compartment (1) and adjacent to the busbar compartment (2). Vertically arranged first contact boxes (31) and second contact boxes (21) are respectively provided in the cable compartment (3) and the busbar compartment (2). The tops of the static contacts in the first contact boxes (31) and the second contact boxes (21) are respectively connected to the branch buses in the cable compartment (3) and the busbar compartment (2), and the bottoms of the static contacts in the first contact boxes (31) and the second contact boxes (21) are respectively opposite to the lower circuit breaker compartment (1). A lifting mechanism (14) is provided in the circuit breaker compartment (1), and a main switch body is mounted on the lifting mechanism (14). The main switch body includes a first moving contact (11), a second moving contact (12) and a circuit breaker (13). The first moving contact (11) and the second moving contact (12) are connected by the circuit breaker (13). The first moving contact (11) and the second moving contact (12) are respectively arranged below the first contact box (31) and the second contact box (21). The lifting mechanism (14) can drive the first moving contact (11) and the second moving contact (12) to move vertically upward to contact the static contacts in the first contact box (31) and the second contact box (21) respectively.

2. The switchgear with a top-mounted contact box according to claim 1, characterized in that: In the circuit breaker compartment (1), between the first moving contact (11) and the first contact box (31), and between the second contact box (21) and the second moving contact (12), valves (6) are respectively provided. An observation window (10) with the same height as the valve (6) is provided on the front door of the circuit breaker compartment (1).

3. The switchgear with an overhead contact box according to claim 1, characterized in that: The relatively arranged first contact box (31) and the first moving contact (11) form a first contact mechanism, and the relatively arranged second contact box (21) and the second moving contact (12) form a second contact mechanism. The first contact mechanism and the second contact mechanism form a contact system, and multiple contact systems are arranged in parallel in the width direction of the switchgear with overhead contact boxes.

4. The switchgear with an overhead contact box according to claim 1, characterized in that: A low-voltage compartment (4) is provided on the side of the busbar compartment (2) away from the cable compartment (3).

5. The switchgear with an overhead contact box according to claim 1, characterized in that: Multiple heat dissipation holes are respectively provided at the tops of the cable compartment (3) and the busbar compartment (2).

6. The switchgear with a top-mounted contact box according to claim 1, characterized in that: The cable compartment (3) is in an L-shaped structure. Its bottom is correspondingly arranged on one side of the circuit breaker compartment, and its top extends above the circuit breaker compartment. A current transformer (32) and an earthing switch are provided at the top of the cable compartment (3). The current transformer (32) and the earthing switch are located above the first contact box (31).

7. The switchgear with an overhead contact box according to claim 1, characterized in that: The lifting mechanism (14) is mounted on a chassis truck (17), and the main switch body, the lifting mechanism (14) and the chassis truck (17) are of an integral structure.

8. The switchgear with an overhead contact box according to claim 1, characterized in that: The lifting mechanism (14) includes a base (141) and a telescopic mechanism disposed above the base (141) and connected to the driving mechanism. The telescopic mechanism includes a top plate (143) disposed opposite to the bottom plate (142), and two cross-set top rods (144) disposed between the top plate (143) and the bottom plate (142). The bottom plate (142) is connected to the base (141), and the top plate (143) is connected to the first moving contact (11), the second moving contact (12), and the circuit breaker (13). The middle parts of the two top rods (144) are hinged, the top ends of the two top rods (144) are respectively in sliding fit with the top plate (143), and the bottom ends of the two top rods (144) are respectively in sliding fit with the bottom plate (142).

9. The switchgear with a top-mounted contact box according to claim 1, characterized in that: The circuit breaker (13) includes a support base (131), an operating mechanism (132) disposed on one side of the support base (131), and a connecting mechanism (133) connected to the operating mechanism (132). The first moving contact (11) and the second moving contact (12) are respectively installed on the support base (131). The operating mechanism (132) can drive the connecting mechanism (133) to contact and separate from the first moving contact (11) and the second moving contact (12) respectively; the height of the operating mechanism (132) is higher than that of the support base (131). The support base (131) is located at the top on one side of the operating mechanism (132). The bottom of the support base (131) is connected to the lifting mechanism (14) through a support insulator (1311). A pole column (15) connected between the two outgoing terminals (16) is provided on the top side of the support base (131).

10. The switchgear with an overhead contact box according to claim 9, characterized in that: Three pairs of outgoing terminals (16) corresponding to three groups of contact systems are provided on the support base (131). One end of each pair of outgoing terminals (16) is respectively connected to the first moving contact (11) and the second moving contact (12) of the corresponding contact system, and the other end of each pair of outgoing terminals (16) is respectively matched with the corresponding connecting mechanism (133); the operating mechanism (132) includes a first connecting rod (1321), a second connecting rod (1322), a third connecting rod (1323), and a driving gear (1324) connected in sequence. The third connecting rod (1323) is eccentrically connected to the driving gear (1324), and the first connecting rod (1321) is connected to the connecting mechanism (133).

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