CN111244809A - Switching device with overhead contact box - Google Patents

Abstract

A switchgear with overhead contact box, it includes circuit breaker room, bus-bar room and cable chamber, through setting up first contact box and second contact box in the top of circuit breaker room respectively, solve the inside heat dissipation problem of the metal enclosed switchgear of air insulation, and provide a obviously visible isolated fracture, miniaturized novel switchgear according to this method. This patent is owing to adopted the contact box at the overhead formula scheme of circuit breaker compartment, so main components and parts and the conductor of this switchgear's cable chamber and generating line indoor portion, and equal the majority arranges in contact box top, and when switchgear is in operation, its produced heat can rise, and is less to the influence of contact box to branch row in it is owing to link to each other with the contact box, is exactly a conduction heat abstractor to the contact box, can further accelerate the heat dissipation of contact box. Meanwhile, the vertical layout of the contact box also enables heat generated by a moving contact and a fixed contact in the contact box to be quickly and conveniently convectively released.

Description

Switching device with overhead contact box

Technical Field

The patent relates to the field of high-voltage electrical appliances, in particular to a switch device with an overhead contact box.

Background

At present, medium-voltage air-insulated metal-enclosed switchgear is mainly divided into a fixed type and a withdrawable type. The fixed air-insulated metal-enclosed switchgear needs to be provided with an isolating switch for isolating a power supply during maintenance; the extractable air-insulated metal-enclosed switchgear can form an isolation fracture between opened contacts by the movement of the main switch.

Refer to the current switchgear that shows of fig. 7, current switchgear's contact box is mostly the level and arranges, not only lead to the heat that contact box self produced to be difficult to discharge, and the heat that heating components and parts such as the inside current transformer of cable chamber produced also can improve the temperature of contact box, if make the contact box work under higher temperature, not only can lead to the contact resistance increase of electrically conductive such as the inside static contact of contact box and movable contact, can accelerate the ageing of contact box moreover, thereby demonstrate hidden danger point and the catalyst that becomes many accidents of switchgear.

In addition, the existing air-insulated metal-enclosed switchgear has large size and high height, and is difficult to transport and install in some special places such as ships and other small spaces. In addition, the main switch of most withdrawable air-insulated metal-enclosed switchgear on the market at present moves horizontally, and when the main switch swings to a working position, the relative positions of a movable door and a movable contact cannot be clearly observed, so that collision or even failure sometimes occurs; when the valve is shaken out to a test position, a visible isolation fracture cannot be observed, the relative position can be used for judging, and potential safety hazards can be generated for overhauling if the valve is not reset or damaged.

Disclosure of Invention

The utility model aims to overcome prior art's defect, provide a good heat dissipation, visual isolation fracture, miniaturized novel switchgear.

In order to achieve the purpose, the following technical scheme is adopted in the patent:

a switchgear with an overhead contact box comprises a breaker chamber, a bus chamber and a cable chamber, wherein the bus chamber is arranged on the top side of the breaker chamber, the cable chamber is positioned on the top side of the breaker chamber and is adjacent to the bus chamber, a first contact box and a second contact box which are perpendicular to each other are arranged in the cable chamber and the bus chamber respectively, the tops of static contacts in the first contact box and the second contact box are connected with branches in the cable chamber and the bus chamber respectively, and the bottoms of the static contacts in the first contact box and the second contact box are opposite to the breaker chamber below respectively; the lifting mechanism is arranged in the circuit breaker chamber, the main switch body is installed on the lifting mechanism and comprises a first moving contact, a second moving contact and a circuit breaker, the first moving contact and the second moving contact are connected through the circuit breaker, the first moving contact and the second moving contact are correspondingly arranged below the first contact box and the second contact box respectively, and the lifting mechanism can drive the first moving contact and the second moving contact to vertically move upwards to be in contact with fixed contacts in the first contact box and the second contact box respectively.

Preferably, the inside of the circuit breaker chamber is provided with a valve corresponding to the space between the first moving contact and the first contact box and the space between the second contact box and the second moving contact, and the front door of the circuit breaker chamber is provided with an observation window with the same height as the valve.

Preferably, the first contact box and the first moving contact which are arranged oppositely form a first contact mechanism, the second contact box and the second moving contact which are arranged oppositely form a second contact mechanism, the first contact mechanism and the second contact mechanism form a contact system, and the contact systems are arranged in parallel in the width direction of the switch device with the overhead contact box.

Preferably, the side of the bus-bar chamber far away from the cable chamber is provided with a low-pressure chamber.

Preferably, a plurality of heat dissipation holes are formed in the tops of the cable chamber and the bus bar chamber respectively.

Preferably, the cable chamber is L type structure, and its bottom corresponds the setting in one side of circuit breaker room, and the top of circuit breaker room is stretched to the top, and the top of cable chamber is equipped with current transformer and earthing switch, and current transformer and earthing switch are located first contact box top.

Preferably, the lifting mechanism is installed on the chassis vehicle, and the main switch body, the lifting mechanism and the chassis vehicle are of an integrated structure.

Preferably, the lifting mechanism comprises a base and a telescopic mechanism arranged above the base and connected with the driving mechanism, the telescopic mechanism comprises a top plate and a top plate, the top plate is relatively provided with a bottom plate, the top plate is provided with two alternately arranged top plates between the top plate and the bottom plate, the bottom plate is connected with the base, the top plate is connected with a first moving contact, a second moving contact and a circuit breaker, the middle parts of the two ejector rods are hinged, the top ends of the two ejector rods are respectively in sliding fit with the top plate, and the bottom ends of the two ejector rods are respectively in sliding fit.

Preferably, the circuit breaker comprises a supporting seat, an operating mechanism arranged on one side of the supporting seat and a connecting mechanism connected with the operating mechanism, the first moving contact and the second moving contact are respectively arranged on the supporting seat, and the operating mechanism can drive the connecting mechanism to respectively contact with and separate from the first moving contact and the second moving contact; the operating mechanism is higher than the supporting seat, the supporting seat is arranged at the top of one side of the operating mechanism, the bottom of the supporting seat is connected with the lifting mechanism through a supporting insulator, and the top side of the supporting seat is provided with a pole connected between the two outgoing line terminals.

Preferably, the supporting seat is provided with three pairs of outgoing line terminals corresponding to the three groups of contact systems respectively, one end of each pair of outgoing line terminals is connected with the first moving contact and the second moving contact of the corresponding contact system respectively, and the other end of each pair of outgoing line terminals is matched with the corresponding connecting mechanism respectively; the operating mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod and a driving gear which are sequentially connected, the third connecting rod is eccentrically connected with the driving gear, and the first connecting rod is connected with the connecting mechanism.

The switchgear with overhead contact box of this patent, through setting up the top in the circuit breaker room respectively with the first contact box in the cable chamber and the second contact box in the generating line room, the heat that produces when making second contact box and first contact box switch-on is discharged through generating line room and cable chamber respectively, when second contact box and first contact box transversely set up can not appear, the both ends of second contact box and first contact box are located the condition of two different cavities respectively, when avoiding second contact box and first contact box both ends heat dissipation inhomogeneous, lead to the heat all to concentrate in a cavity, can effectively improve the thermal diffusivity, and the heat that this patent second contact box and first contact box produced need not pass through the circuit breaker room heat discharge, can avoid improving the indoor temperature of circuit breaker, the reliability is also higher.

In addition, the first contact box or the second contact box is not required to be arranged on the side face of the breaker chamber, so that the transverse size of the air-insulated metal-enclosed switchgear can be reduced, the occupied area is reduced, and when the first movable contact group and the second movable contact group are driven by the lifting mechanism to vertically move upwards to be respectively contacted with the first contact box and the second contact box, the first movable contact group and the second movable contact group are clamped above the lifting mechanism and are between the first contact box and the second contact box, so that the contact is more reliable.

In addition, through the isolation fracture that observes main loop that the observation window can be clear, not only can guarantee to overhaul again when the valve is closed, ensured the safety during maintenance, can avoid valve and main switch body collision to produce the trouble moreover.

In addition, because the utmost point post of circuit breaker is on a parallel with air-insulated metal-enclosed switchgear width direction setting, the utmost point post of circuit breaker is the level arrangement promptly, has reduced the height of whole equipment, makes its can be more convenient be applicable to short space, like the inside etc. of boats and ships.

In addition, main switch body, elevating system and chassis car formula structure as an organic whole drive the switching of main switch body at experimental position and operating position through the vertical motion of chassis car. When the lifting mechanism is in a contraction state (test position), the whole main switch can be freely moved out of the switch device without an additional transfer handcart, so that the convenience and the time saving are realized.

Drawings

FIG. 1 is a front view of a switchgear of an embodiment of the present patent;

FIG. 2 is a cross-sectional view of the embodiment of this patent, FIG. 1;

FIG. 3 is another cross-sectional view of FIG. 2 of this patent embodiment;

fig. 4 is a schematic structural diagram of a first movable contact group and a second movable contact group of the embodiment of the patent;

FIG. 5 is a cross-sectional view of the main switch body of the embodiment of this patent;

FIG. 6 is a temperature rise gas flow pattern of an embodiment of the present patent;

figure 7 is a temperature rise airflow roadmap of the prior art.

Detailed Description

The embodiments of the switching device with overhead contact box according to the present invention will be further described with reference to the embodiments shown in fig. 1 to 7. The switching device of the present patent with overhead contact boxes is not limited to the description of the following embodiments.

This patent is owing to adopted the overhead formula scheme of contact box in the circuit breaker compartment, so inside main components and parts and the conductor of cable chamber 3 and generating line room 2 of this air-insulated metal-enclosed switchgear, and equal major part arranges in contact box top, and when switchgear is in operation, its produced heat can rise, and is less to the influence of contact box to branch row in it is owing to link to each other with the contact box, is exactly a conduction heat abstractor to the contact box, can further accelerate the heat dissipation of contact box. Meanwhile, the vertical layout of the contact box also enables heat generated by a moving contact and a fixed contact in the contact box to be quickly and conveniently convectively released.

As shown in fig. 1-2, the switchgear with an overhead contact box of this patent includes a circuit breaker chamber 1, a bus bar chamber 2 and a cable chamber 3, the bus bar chamber 2 is disposed 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 bus bar chamber 2, a first contact box 31 and a second contact box 21 are disposed in the cable chamber 3 and the bus bar chamber 2, respectively, the top of a stationary contact in the first contact box 31 and the second contact box 21 is connected to a branch row in the cable chamber 3 and the bus bar chamber 2, respectively, and the bottom of the stationary contact in the first contact box 31 and the second contact box 21 is opposite to the circuit breaker chamber 1 below;

be equipped with elevating system 14 in circuit breaker room 1, and install the main switch body on elevating system 14, the main switch body includes first moving contact 11, second moving contact 12 and circuit breaker 13, first moving contact 11 and second moving contact 12 are connected with circuit breaker 13 after linking to each other through utmost point post 15, first moving contact 11 and second moving contact 12 correspond the below that sets up at first contact box 31 and second contact box 21 respectively, elevating system 14 can drive the vertical rebound of first moving contact 11 and second moving contact 12 respectively with the static contact in first contact box 31 and the second contact box 21.

In the switch equipment with the overhead contact box, the first contact box 31 in the cable chamber 3 and the second contact box 21 in the bus-bar chamber 2 are respectively arranged above the breaker chamber 1, so that the heat generated when the second contact box 21 and the first contact box 31 are switched on is respectively exhausted through the bus-bar chamber 2 and the cable chamber 3, when the second contact box 21 and the first contact box 31 are transversely arranged, in the case where the two ends of the second contact box 21 and the first contact box 31 are located in two different chambers, the heat dissipation performance can be effectively improved by avoiding the heat from being concentrated in one cavity when the heat dissipation performance at the two ends of the second contact box 21 and the first contact box 31 is not uniform, moreover, the heat generated by the second contact box 21 and the first contact box 31 does not need to be discharged through the breaker chamber 1, the temperature in the breaker chamber 1 can be prevented from being increased, and the reliability is higher. In addition, the switchgear of the present patent having overhead contact boxes has a height H1 that is less than the height H2 of the prior art, not only is less bulky, but also the heat can drain out of the housing more quickly as it rises.

In addition, the first contact box 31 or the second contact box 21 does not need to be arranged on the side face of the breaker chamber 1, so that the transverse size of the air-insulated metal-enclosed switchgear can be reduced, the occupied area is reduced, and when the lifting mechanism drives the first movable contact group and the second movable contact group to vertically move upwards to be respectively contacted with the first contact box 31 and the second contact box 21, the first movable contact group and the second movable contact group are clamped above the lifting mechanism and are between the first contact box 31 and the second contact box 21, so that the contact is more reliable.

Further, the breaker room 1 is internally corresponding between the first movable contact 11 and the first contact box 31, and the second contact box 21 and the second movable contact 12 are respectively provided with the valve 6, the front door of the breaker room 1 is provided with the observation window 10 with the same height as the valve 6, the valve 6 can move in multiple modes, including mechanical and electrical modes, the states of the breaker 13 and the valve 6 in the breaker room 1 can be observed through the observation window 10, not only can the maintenance be guaranteed when the valve is closed, the safety during the maintenance is guaranteed, but also the failure caused by the collision of the valve and the main switch body can be avoided.

As shown in fig. 3, the lifting mechanism 14 is lifted vertically to push the main switch body to move upward, and at the same time, the shutter 6 is opened, and finally, the first movable contact 11 and the second movable contact 12 respectively contact and engage with the fixed contacts in the corresponding first contact box 31 and the corresponding second contact box 21 to reach the working position. In the process, the relative movement condition of the shutter 6 and the main switch body can be clearly observed through the observation window 10, and the failure caused by collision of the shutter 6 and the main switch body is prevented.

As shown in fig. 2, the lifting mechanism 14 is not lifted, the valve 6 is not opened, the circuit breaker 13 is at a test position, an isolation fracture of the main circuit can be clearly observed through the observation window 10, the valve 6 is guaranteed to be overhauled when closed, and the safety during the overhaul period is guaranteed. At this time, when the lower cabinet door is opened, the lifting mechanism 14, the first movable contact 11, the second movable contact 12 and the circuit breaker 13 can be moved out of or into the whole main switch. Preferably, elevating system 14 installs on chassis car 17, and main switch body, elevating system 14 and chassis car 17 formula structure as an organic whole, and the bottom of chassis car is equipped with the gyro wheel, and what can be convenient pass through the formula chassis car takes the wheel certainly, shifts out or moves in whole main switch.

As shown in fig. 3-4, the first contact box 31 and the first movable contact 11, which are oppositely disposed, form a first contact mechanism, the second contact box 21 and the second movable contact 12, which are oppositely disposed, form a second contact mechanism, the first contact mechanism and the second contact mechanism form a contact system, the first contact box 31 and the second contact box 21 are respectively connected with a cable and a bus, the first movable contact 11 is connected with the second movable contact 12, the lifting mechanism 14 can drive the first movable contact 11 and the second movable contact 12 to vertically move along a direction parallel to the height direction of the air-insulated metal-enclosed switchgear of this patent, and respectively contact and separate with the corresponding first contact box 31 and the second contact box 21, and when the first movable contact 11 and the second movable contact 12 respectively contact with the corresponding first contact box 31 and the second contact box 21, a passage is formed between the first contact box 31 and the second contact box 21.

The embodiment includes three contact systems, but the number of the contact systems can also be changed according to the actual working environment, and the invention belongs to the protection scope of the invention.

The embodiment comprises three contact systems which are parallel to the width direction of the air-insulated metal-enclosed switchgear and are arranged in parallel, the three contact systems which are arranged in parallel are perpendicular to the moving-out or moving-in direction of the lifting mechanism 14, and the first contact box 31, the second contact box 32, the first moving contact 11 and the second moving contact 12 of each group of contact systems are vertically arranged, namely, the contact systems are highly parallel to the height of the air-insulated metal-enclosed switchgear. Through being on a parallel with the width direction setting of air insulated metal enclosed switchgear with the contact system, not only can reduce air insulated metal enclosed switchgear's height, be convenient for air insulated metal enclosed switchgear can be more convenient be applicable to short space, like the boats and ships inside etc. moreover in main loop switch-on and circular telegram operation, at the inside heat that produces of first contact box 31 and second contact box 32, can follow the convenient and fast ground transmission in the bottom of first contact box 31 and second contact box 32 respectively, the heat dissipation of being convenient for. Preferably, the first contact box 31 and the second contact box 32 are respectively buckled above the respective stationary contacts, and heat dissipation holes are respectively formed in the tops of the first contact box 31 and the second contact box 32. Of course, the first contact box 31 and the second contact box 32 may be integral or mounted. In addition, the first contact box 31 and the second contact box 32 may not have heat dissipation holes, which falls within the protection scope of the present invention.

As shown in fig. 3, the bus bar chamber 2 is disposed on the top side of the circuit breaker chamber 1, the cable chamber 3 is disposed on the top side of the circuit breaker chamber 1 and adjacent to the bus bar chamber 2, and a low voltage chamber 4 is disposed on the other side of the bus bar chamber 2 opposite to the cable chamber 3, and the low voltage chamber 4 is used for accommodating low voltage electronic equipment such as a relay.

Further, a plurality of heat dissipation holes are respectively formed in the tops of the cable chamber 3 and the bus chamber 2. The hot air of the first contact box 31 and the second contact box 21 which are respectively arranged in parallel to the height direction of the air-insulated metal-enclosed switchgear can be conveniently discharged upwards from the radiating holes when the switchgear is switched on, and the heat radiation performance can be further improved. The heat dissipation holes of the cable chamber 3 may be disposed on the sidewall of the first cavity 3A, or may be disposed on the sidewalls of other cavities of the cable chamber 3.

Referring to fig. 2, a preferred embodiment of the cable chamber 3 is shown, the cable chamber 3 of the preferred embodiment is in an L-shaped structure, the bottom of the cable chamber is correspondingly arranged on one side of the breaker chamber, the top of the cable chamber extends to the top of the breaker chamber, the top of the cable chamber 3 is provided with components such as a current transformer 32 and a grounding switch, and the current transformer 32 and the grounding switch are located above the first contact box 31.

Referring to fig. 5, a preferred embodiment of the circuit breaker 13 is shown, the circuit breaker 13 includes a supporting base 131, an operating mechanism 132 disposed on one side of the supporting base 131, and a connecting mechanism 133 connected to the operating mechanism 132, the first movable contact 11 and the second movable contact 12 are respectively mounted on the supporting base 131, the operating mechanism 132 can drive the connecting mechanism 133 to respectively contact with the first movable contact 11 and the second movable contact 12, a path is formed between the first movable contact 11 and the second movable contact 12, when a fault occurs in the main circuit, the operating mechanism 132 can drive the connecting mechanism 133 to respectively separate from the first movable contact 11 and the second movable contact 12, so as to disconnect the main circuit to implement protection.

Specifically, three pairs of corresponding outlet terminals 16 of three contact systems are arranged on the supporting base 131, one end of each pair of outlet terminals 16 is connected to the first moving contact 11 and the second moving contact 12 of the corresponding contact system, the other end of each pair of outlet terminals 16 is matched with the corresponding connecting mechanism 133, and the operating mechanism 132 can drive the connecting mechanism 133 to contact with and separate from the corresponding two outlet terminals 16.

The operating mechanism 132 comprises a link mechanism, an energy storage mechanism and an operating handle, the link mechanism comprises at least two connecting rod pieces in snap fit, when the operating handle rotates to a switching-on position, the link mechanism stores energy for the energy storage mechanism and enables the connecting mechanism 133 to be in contact with a corresponding outgoing line terminal 16, when a main loop fails, the connecting rod pieces in snap fit are buckled, the energy storage mechanism releases energy due to unbalance, the connecting rod is driven by the energy storage mechanism to drive the connecting mechanism 133 to be separated from the corresponding outgoing line terminal 16 to realize protection, the buckling of the energy storage mechanism and the link mechanism of the operating mechanism is not repeated in the prior art, the main improvement point of the circuit breaker of the patent is the arrangement structure of the supporting seat 131, the connecting mechanism 133, the connecting terminal and the supporting insulator 1311, the connecting mechanism 133 is arranged perpendicular to the first moving contact 11 and the second moving contact 12, the overall height is reduced, and insulation and support are provided by the supporting insulator, and (4) reliability and stability.

Specifically, the link mechanism includes a first link 1321, a second link 1322, a third link 1323 and a driving gear 1324, which are connected in sequence, the third link 1323 is eccentrically connected with the driving gear 1324, the first link 132 is connected with the connecting mechanism 133, and the driving gear 1324 drives the connecting mechanism 133 to move sequentially through the third link 1323, the second link 1322 and the first link 1321 when rotating.

Further, the height of the operating mechanism 132 is higher than that of the supporting base 131, the supporting base 131 is located at the top of one side of the operating mechanism 132, the bottom of the supporting base 131 is connected with the lifting mechanism 14 through a supporting insulator 1311, and a pole post 15 connected between the two outlet terminals 16 is arranged at the top of the supporting base 131. The supporting insulator 1311 makes the top height of the supporting seat 131 the same as that of the operating mechanism 132, which not only simplifies the structure of the connecting mechanism 133, but also supports the first moving contact 11 and the second moving contact 12, thereby increasing the contact pressure and ensuring the contact reliability.

Referring to fig. 2-3, a preferred embodiment of the lifting mechanism 14 is shown, 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 top plates 144 disposed between the top plate 143 and the bottom plate 142 and crossing each other, the bottom plate 142 is connected to the base 141, the top plate 143 is connected to the first movable contact 11, the second movable contact 12 and the breaker 13, the middle portions of the two push rods 144 are hinged, the top ends of the two push rods 144 are respectively slidably engaged with the top plate 143, and the bottom ends of the two push rods 144 are respectively slidably engaged with the bottom plate 142. Of course, the lifting mechanism 14 can be implemented in various ways, including mechanical transmission, electrical control, and the like. The foregoing is a more detailed description of the present patent with reference to specific preferred embodiments, and the patent is not to be considered as limited to the specific embodiments described herein. For those skilled in the art to which this patent pertains, several simple deductions or substitutions may be made without departing from the concept of this patent, which should be considered as belonging to the protection scope of this patent.

Claims (10)

1. A switchgear having an overhead contact box, characterized in that: the device comprises a circuit breaker chamber (1), a bus chamber (2) and a cable chamber (3), wherein the bus chamber (2) is arranged on the top side of the circuit breaker chamber (1), the cable chamber (3) is positioned on the top side of the circuit breaker chamber (1) and is adjacent to the bus chamber (2), a first contact box (31) and a second contact box (21) which are perpendicular to each other are respectively arranged in the cable chamber (3) and the bus chamber (2), the tops of static contacts in the first contact box (31) and the second contact box (21) are respectively connected with branch rows in the cable chamber (3) and the bus chamber (2), and the bottoms of the static contacts in the first contact box (31) and the second contact box (21) are respectively opposite to the circuit breaker chamber (1) below; be equipped with elevating system (14) in circuit breaker room (1), and install the main switch body on elevating system (14), the main switch body includes first moving contact (11), second moving contact (12) and circuit breaker (13), first moving contact (11) and second moving contact (12) link to each other through circuit breaker (13), first moving contact (11) and second moving contact (12) correspond the below that sets up in first contact box (31) and second contact box (21) respectively, elevating system (14) can drive first moving contact (11) and vertical upward movement of second moving contact (12) respectively with the static contact in first contact box (31) and second contact box (21).

2. The switchgear with overhead contact box of claim 1 wherein: the novel circuit breaker is characterized in that a valve (6) is arranged in the circuit breaker chamber (1) between the first movable contact (11) and the first contact box (31) correspondingly and between the second contact box (21) and the second movable contact (12) respectively, and an observation window (10) with the same height as the valve (6) is arranged at the front door of the circuit breaker chamber (1).

3. The switchgear with overhead contact box of claim 1 wherein: the first contact box (31) and the first moving contact (11) which are oppositely arranged form a first contact mechanism, the second contact box (21) and the second moving contact (12) which are oppositely arranged form a second contact mechanism, the first contact mechanism and the second contact mechanism form a contact system, and the contact systems are arranged in parallel in the width direction of the switch device with the overhead contact box.

4. The switchgear with overhead contact box of claim 1 wherein: and a low-pressure chamber (4) is arranged on one side of the bus chamber (2) far away from the cable chamber (3).

5. The switchgear with overhead contact box of claim 1 wherein: and a plurality of heat dissipation holes are respectively formed in the tops of the cable chamber (3) and the bus chamber (2).

6. The switchgear with overhead contact box of claim 1 wherein: cable chamber (3) are L type structure, and its bottom corresponds the setting in one side of circuit breaker room, and the top of circuit breaker room is stretched to the top, and the top of cable chamber (3) is equipped with current transformer (32) and earthing switch, and current transformer (32) and earthing switch are located first contact box (31) top.

7. The switchgear with overhead contact box of claim 1 wherein: the lifting mechanism (14) is installed on the chassis (17), and the main switch body, the lifting mechanism (14) and the chassis (17) are of an integrated structure.

8. The switchgear with overhead contact box of claim 1 wherein: the lifting mechanism (14) comprises a base (141) and a telescopic mechanism arranged above the base (141) and connected with a driving mechanism, the telescopic mechanism comprises a top plate (143) oppositely provided with a bottom plate (142), and two top plates (144) which are arranged between the top plate (143) and the bottom plate (142) in a crossed manner, the bottom plate (142) is connected with the base (141), the top plate (143) is connected with a first moving contact (11), a second moving contact (12) and a circuit breaker (13), the middle parts of the two ejector rods (144) are hinged, the top ends of the two ejector rods (144) are respectively in sliding fit with the top plate (143), and the bottom ends of the two ejector rods (144) are respectively in sliding fit with the bottom plate (142).

9. The switchgear with overhead contact box of claim 1 wherein: the circuit breaker (13) comprises a supporting seat (131), an operating mechanism (132) arranged on one side of the supporting seat (131) and a connecting mechanism (133) connected with the operating mechanism (132), wherein the first moving contact (11) and the second moving contact (12) are respectively arranged on the supporting seat (131), and the operating mechanism (132) can drive the connecting mechanism (133) to be respectively contacted with and separated from the first moving contact (11) and the second moving contact (12); the height of the operating mechanism (132) is higher than that of the supporting seat (131), the supporting seat (131) is located at the top of one side of the operating mechanism (132), the bottom of the supporting seat (131) is connected with the lifting mechanism (14) through a supporting insulator (1311), and a pole column (15) connected between the two outlet terminals (16) is arranged on the top side of the supporting seat (131).

10. The switchgear with overhead contact box of claim 9 wherein: the supporting seat (131) is provided with three pairs of corresponding outgoing line terminals (16) which are respectively connected with the three groups of contact systems, one end of each pair of outgoing line terminals (16) is respectively connected with 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 line terminals (16) is respectively matched with the corresponding connecting mechanism (133); the operating mechanism (132) comprises a first connecting rod (1321), a second connecting rod (1322), a third connecting rod (1323) and a driving gear (1324) which are sequentially connected, the third connecting rod (1323) is eccentrically connected with the driving gear (1324), and the first connecting rod (132) is connected with the connecting mechanism (133).

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