Measuring cabinet

Abstract

The present invention discloses a metering cabinet, which includes a cabinet body and a metering trolley. The front side of the cabinet body includes an installation cavity for inserting and installing the metering trolley. Six interfaces are provided on the rear side wall of the installation cavity. The metering trolley includes six contact arms corresponding to and connected with the interfaces. The rear side of the cabinet body includes a rear chamber, and six contact boxes corresponding to and connected with the interfaces are arranged in the rear chamber. The six interfaces and the six contact arms are both arranged in a matrix arrangement of three rows and two columns. Openings communicating with the rear chamber are provided on both sides of the cabinet body. The side part of each contact box includes a connection port corresponding to and connected with a copper bar, and the connection ports of the two columns of contact boxes are respectively arranged corresponding to the opening directions on both sides of the cabinet body. The present invention provides a movable safety door with a simple and compact structure, which occupies less internal space of the metering cabinet and is more suitable for being configured on a metering cabinet with an interface layout structure of three rows and two columns.

Description

Technical Field

[0001] The present invention relates to a metering cabinet. Background Art

[0002] The metering cabinet is an indispensable part of power equipment and is widely used in power equipment. The metering cabinet is a special cabinet type of electricity metering device. When the metering cabinet is installed and used, it needs to be used in cooperation with other types of switch cabinets such as PT cabinets and isolation cabinets. For example, the metering cabinet is interspersed and configured in rows of switch cabinets, and is electrically connected to the switch cabinets arranged on both adjacent sides through copper bars.

[0003] Existing metering cabinets usually include a cabinet body and a metering trolley. The cabinet body includes an internal installation cavity for inserting the metering trolley. In order to be applicable to the metering of three-phase electricity, 6 interfaces are provided on the rear side wall of the installation cavity, namely 3 incoming line interfaces and 3 outgoing line interfaces. These 6 interfaces usually adopt a two-row and three-column (i.e., 3 horizontal and 2 vertical) layout structure. This interface layout method occupies more space in the lateral direction. Correspondingly, in order to realize the connection with the interfaces, the 6 contact arms on the metering trolley also need to adopt the same layout structure. For example, a metering trolley with the above-mentioned contact arm layout structure is disclosed in a Chinese invention of a practical metering trolley (CN207926040U). This makes the overall metering cabinet have a larger width and greatly increases the occupation of indoor space. In order to realize the electrical connection between the metering cabinet and the adjacent switch cabinets, it is also necessary to connect the interfaces of the metering cabinet and the interfaces of the adjacent switch cabinets through multiple copper bars. In order to avoid interference, these copper bars need to be bent and turned multiple times, which brings a lot of inconvenience to the production, processing and installation of the copper bars, and also increases the power loss. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a metering cabinet with a simpler and more compact structure and more convenient wiring and installation.

[0005] To achieve the above object, the present invention provides a metering cabinet, including a cabinet body and a metering trolley. The front side of the cabinet body includes an installation cavity for inserting and installing the metering trolley. 6 interfaces are provided on the rear side wall of the installation cavity. The metering trolley includes 6 contact arms corresponding to and connected with the interfaces. The rear side of the cabinet body includes a rear chamber, and 6 contact boxes corresponding to and connected with the interfaces are arranged in the rear chamber. The 6 interfaces and the 6 contact arms are both arranged in a three-row and two-column matrix arrangement. Openings communicating with the rear chamber are provided on both sides of the cabinet body. The side part of each contact box includes a connection port corresponding to and connected with the copper bar. The connection ports of the two columns of contact boxes are respectively arranged corresponding to the opening directions on both sides of the cabinet body.

[0006] The beneficial effects of the present invention are as follows: The interface and the contact arm adopting the matrix arrangement mode of three rows and two columns can significantly reduce the lateral space occupation of the metering cabinet (including the metering trolley), making the overall width of the metering cabinet narrower. When electrical connection needs to be made between the metering cabinet and the switch cabinets on its adjacent two sides, one end of the copper bar is connected to the connection port of the contact box, and the other end of the copper bar extends out along the side opening of the cabinet body and is then connected to the adjacent switch cabinet. With this structural design, the copper bars for wiring can all be straight strip-shaped structures, without the need for multiple bends, which can reduce the length of the copper bars and make the installation process simpler.

[0007] Further, the metering trolley includes a chassis trolley and a trolley frame installed on the chassis trolley. Inside the trolley frame, there are insulators, contact arms, fusing tubes, two voltage transformers and two current transformers. The insulators and the two current transformers are longitudinally distributed on one side inside the trolley frame. The insulator is arranged between the two current transformers. The insulator and the current transformers each include two transversely distributed connection ends, and each connection end is connected with the contact arm described above; the two voltage transformers are longitudinally distributed on the other side inside the trolley frame. The two voltage transformers are respectively arranged close to the sides of the two current transformers. Each voltage transformer includes two longitudinally distributed connection ends. One of the connection ends of the two voltage transformers that are close to each other is connected by a first copper bar; the other connection ends of the two voltage transformers are connected to the connection ends on the current transformer that is close to them through fusing tubes. The connection end on the current transformer connecting the fusing tube is the connection end arranged in the direction close to the voltage transformer. The first copper bar and the connection end of the insulator close to the first copper bar are overlapped through a fusing tube. The connection ends of the two insulators are connected by a second copper bar arranged transversely.

[0008] The effects that can be achieved by adopting the above technical solution are as follows: In order to realize the above-mentioned contact arm arrangement mode of three rows and two columns, the layout structure of the internal components of the metering trolley is designed, making the internal structure of the trolley more compact, which can reduce the occupation of the internal space of the trolley, and further reduce the overall size of the trolley. Especially, a more prominent reduction is obtained in the width dimension. After the compact design, less connection materials are required between the internal components, and the production cost can also be reduced.

[0009] Further, a first insulating cover for isolating the connection ends of the insulator and the connection ends of the current transformer is provided on the insulator. The first insulating cover includes a notch facing the rear of the trolley. The two connection ends of the insulator and the second copper bar are all arranged in the notch of the first insulating cover.

[0010] The effects that the above structural arrangement can produce are as follows: When the distance between the connection end of the insulator and the current transformer is too close, there is a risk of creepage. The first insulating cover can play an insulating role, ensuring the safe use of the metering trolley, enabling the insulator and the current transformer to be arranged at a closer distance, which is beneficial to making the structure more compact; the side wall of the notch of the first insulating cover can block between the adjacent insulator and the connection end of the current transformer, and setting the notch at the position facing the rear of the trolley facilitates the threading and installation of the contact arm.

[0011] Further, the two connection ends of the voltage transformer are arranged in an inclined distribution relative to the vertical direction, and the two connection ends of the two voltage transformers that are close to each other are arranged in an inclined distribution relative to the vertical direction.

[0012] The effects that the above structural arrangement can produce are as follows: On the one hand, it helps to reduce the volume of the voltage transformer itself, keeping a relatively far distance between its two connection ends and making it not easy to occur creepage. On the other hand, it can also make the two voltage transformers closer to each other, making it not easy to occur creepage between the connection ends of the two voltage transformers.

[0013] Further, a second insulating cover for isolating between the two connection ends of the voltage transformer is provided on the voltage transformer. The second insulating cover is arranged on the other connection end of the voltage transformer and is sleeved in cooperation with one end of the fuse tube.

[0014] The effects that the above structural arrangement can produce are as follows: The setting of the second insulating cover can prevent the problem of creepage between the two connection ends of the voltage transformer, improve the insulating effect, help to reduce the volume of the voltage transformer itself, and has a simple structure and is relatively convenient to install.

[0015] Further, a valve mechanism is also provided on the rear side wall of the installation cavity. The valve mechanism includes two safety doors, two fixing frames, and two driving mechanisms. The two safety doors, two fixing frames, and two driving mechanisms are used to be correspondingly arranged on both sides of the interface. The driving mechanism includes a driving rod and a reset member. A guiding groove for sliding in cooperation with the safety door is provided on the fixing frame. The guiding groove is used to guide the two safety doors to slide towards the approaching direction to close the interface of the metering cabinet or slide towards the separating direction to open the interface of the metering cabinet. The driving rod is linked with the safety door in cooperation and is used to drive the safety door to slide along the guiding groove in the direction of opening the interface of the metering cabinet. The reset member is linked with the safety door in cooperation and is used to drive the safety door to move along the guiding groove in the direction of closing the interface of the metering cabinet.

[0016] The above structural setting can produce the following effects: by driving the two safety doors to move away from each other through the driving rod, the interface of the metering cabinet can be exposed, so that it can be electrically connected to the metering trolley; when the connection is not required, the two safety doors are driven to move towards each other through the reset member, so that the interface of the metering cabinet is blocked, which can prevent objects from touching the interface and improve safety. Compared with the use of a movable safety door, the setting of two sets of safety doors, fixed frames, and driving mechanisms can reduce the sliding distance of the safety doors, which is conducive to simplifying the overall structure, making the overall structure more compact, and reducing the occupation of the internal space of the metering cabinet. It is particularly suitable for cooperation with the interface of the three-row and two-column arrangement.

[0017] Furthermore, the guide groove of one of the fixed frames is a straight guide groove, and both ends of the straight guide groove are set corresponding to the width of the metering cabinet. The guide groove of the other fixed frame is an L-shaped guide groove, and the L-shaped guide groove includes a first straight line segment, a second straight line segment and an arc-shaped connecting segment. The first straight line segment is set corresponding to the front and rear direction of the metering cabinet, and the second straight line segment is set corresponding to the width direction. The arc-shaped connecting segment is connected between the first and second straight line segments.

[0018] The above structural setting can produce the following effects: the linear guide groove structure is simple, the movement of the safety door on the linear guide groove is simple and direct, the opening and closing efficiency of the safety door can be improved, and the linear guide groove can be set close to the rear wall of the metering cabinet installation cavity to reduce the occupation of the internal space; in the above technical scheme, the first straight section of the L-shaped guide groove is close to the rear wall of the metering cabinet, and the second straight section is close to the side wall of the metering cabinet. When the internal space of the metering cabinet is limited, when the safety door slides to the arc-shaped connecting section, it will change the sliding direction with the guide groove, from the original left and right sliding to the front and back sliding, and the safety door can be slid from the rear of the internal space of the metering cabinet to the side position of the installation cavity, which occupies less space in the installation cavity, especially not easy to interfere with the metering trolley. In the present invention, since the six interfaces are set at a position biased towards one side of the cabinet body, it is preferred that the guide groove of the fixing frame on the side with a smaller distance between the interface and the side wall of the installation cavity adopts an L-shaped guide groove, and the guide groove of the fixing frame on the side with a larger distance adopts a linear guide groove.

[0019] Furthermore, the fixed frame is an L-shaped structure, one end of the driving rod is rotatably connected to one end of the fixed frame, and the other end of the driving rod is movably connected to the safety door. When the driving rod and the fixed frame rotate relative to each other, the safety door can be driven to slide along the guide groove. The driving rod is pushed to move by the metering trolley when the metering trolley is inserted into the metering cabinet. The driving rod is provided with a pulley that cooperates with the metering trolley. The other end of the driving rod also includes a slide groove. The safety door is provided with a sliding seat that slides in cooperation with the guide groove. The sliding seat is movably connected to the slide groove. The reset member is a torsion spring, and the torsion spring is provided at the rotation connection between one end of the driving rod and the fixed frame.

[0020] The effects that can be produced by the above structural settings are as follows: when the relative rotation occurs between one end of the driving rod and the fixed frame, the other end of the driving rod can drive the safety door to slide along the guide groove, with a simple transmission structure and good stability; when the metering trolley is pushed into the internal space of the metering cabinet, the metering cabinet contacts the driving rod and pushes the driving rod to rotate, thereby driving the safety door to slide along the guide groove; the setting of the pulley can reduce the friction generated when the trolley contacts the driving rod; while the driving rod drives the sliding seat to slide along the guide groove, the sliding seat can also slide along the chute of the driving rod, preventing interference among the driving rod, the sliding seat, and the fixed frame and improving the transmission effect.

[0021] Further, a plurality of indicating marks composed of different colors are provided on the safety door, and these indicating marks are distributed at positions corresponding to the interfaces of the metering cabinet when the safety door is closed.

[0022] The effects that can be produced by the above structural settings are as follows: the plurality of indicating marks of different colors provided on the safety door can intuitively indicate the positions of different interfaces inside the metering cabinet, improving safety.

[0023] The present invention is further provided with: rolling members for rolling cooperation with the inner side wall of the metering cabinet are provided at the upper / lower part of the safety door, and the lower / upper part of the safety door is in sliding cooperation with the fixed frame.

[0024] The effects that can be produced by the above structural settings are as follows: in the above technical solution, the setting of the rolling members can reduce the friction between the safety door and the inner side wall of the metering cabinet during movement, improve the smoothness and stability of the safety door during movement, and reduce the noise generated when the safety door collides with the inner side wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a perspective view of an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the internal structure of an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of the contact box of an embodiment of the present invention;

[0028] Figure 4 is a perspective view of the metering trolley of an embodiment of the present invention;

[0029] Figure 5 is a rear view of the metering trolley of an embodiment of the present invention;

[0030] Figure 6 is an exploded view of the metering trolley of an embodiment of the present invention;

[0031] Figure 7 is a schematic diagram of the distribution of the connection ends of the voltage transformer of the metering trolley of an embodiment of the present invention;

[0032] Figure 8 The top view of the valve mechanism according to the embodiment of the present invention;

[0033] Figure 9 The front view of the valve mechanism according to the embodiment of the present invention;

[0034] Figure 10 The perspective view of the valve mechanism according to the embodiment of the present invention;

[0035] Figure 11 The installation schematic diagram of the valve mechanism according to the embodiment of the present invention. Detailed implementation manners

[0036] The embodiment of the metering cabinet of the present invention is as Figures 1-11 shown, and includes a cabinet body 1 and a metering trolley 100. The front side of the cabinet body 1 includes an installation cavity 11 for the metering trolley 100 to be inserted and installed. Six interfaces 2 are provided on the rear side wall of the installation cavity 11. The metering trolley 100 includes six contact arms 101 corresponding to and connected with the interfaces 2. The rear side of the cabinet body 1 includes a rear chamber 12, and six contact head boxes 3 connected with the interfaces are arranged in the rear chamber 12. The six interfaces 2 and the six contact arms 101 are both arranged in a matrix arrangement of three rows and two columns. The six interfaces 2 and the six contact arms 101 are both arranged at positions biased towards one side of the cabinet body 1 and the metering trolley 100. Openings 13 communicating with the rear chamber 12 are provided on both sides of the cabinet body 1. Each side of the contact head box 3 includes a connection port 31 corresponding to and connected with a copper bar. The connection ports 31 of the two columns of contact head boxes 3 are respectively arranged corresponding to the opening directions on both sides of the cabinet body 1 (as Figure 3 shown).

[0037] When wiring and installing between the metering cabinet and other switch cabinets arranged adjacent to each other, one end of the copper bar is connected to the connection port of the contact head box 3, and the other end of the copper bar directly passes through the opening 13 and is connected to the adjacent switch cabinet. The wiring is convenient, the requirements for the copper bar are relatively low, the copper bar does not need to turn many times during wiring, and the power loss can be reduced.

[0038] The metering trolley 100 is as Figures 4-7 shown, and includes a chassis trolley and a hand truck frame arranged on the chassis trolley. For the convenience of description, the left side inside the hand truck frame is called the first installation unit, and the right side is called the second installation unit. The left side mentioned herein refers to the left side direction with the rear view (i.e., Figure 5 ) as the viewing angle, and the right side refers to the right side direction with the rear view as the viewing angle.

[0039] Inside the first installation unit on the left side, there are insulators 103 and two current transformers 104 arranged longitudinally. The insulator 103 is arranged between the two current transformers 104. Both the insulator 103 and the current transformers 104 include two connection ends. The two connection ends of the insulator 103 and the two current transformers 104 are arranged horizontally. Contact arms 101 are connected to the connection terminals of the insulator 103 and the two current transformers 104. The two connection ends of the insulator 103 and the two current transformers 104 are provided with contact arms 101. Above the insulator 103, there is a first insulating cover 102 made of insulating material. The first insulating cover 102 includes a notch 1021 facing the rear of the handcart. The two connection ends of the insulator 103 are arranged in the notch 1021 of the first insulating cover. The two contact arms 101 on the insulator 103 are connected by a horizontally arranged second copper bar 109. The connection end of the insulator 103 and the second copper bar 109 are arranged in the notch 1021 of the first insulating cover 102. This prevents creepage between the connection ends of the insulator 103 and the connection ends of the current transformers 104 located above or below.

[0040] Inside the second installation unit on the right side, there are two voltage transformers 105 arranged vertically. The two voltage transformers 105 are respectively arranged close to the sides of the two current transformers 104. The two connection ends 1051 of the voltage transformers 105 are arranged diagonally, that is, the two connection ends of the voltage transformers are inclined relative to the vertical direction. One of the connection ends 1051 that are close to each other between the two voltage transformers 105 is also arranged diagonally and connected by a first copper bar 108. The two connection ends that are close to each other of the two voltage transformers 105 are inclined relative to the vertical direction. At the other connection end of each voltage transformer 105, there is a second insulating cover 106. The second insulating cover 106 is used to block the risk of creepage between the two connection ends of the voltage transformer 105.

[0041] The connection structure between the first installation unit on the left side and the second connection unit on the right side is as follows: The current transformer 104 and the voltage transformer 105 are connected by a fuse tube 107. One end of the fuse 107 is arranged on the connection end of the current transformer 104 close to the voltage transformer 105, and the other end is arranged inside the second insulating cover 106; the connection end of the insulator 103 close to the voltage transformer 105 is connected to the voltage transformer 105 by the way of lapping the fuse tube 107 on the first copper bar 108.

[0042] Through the above settings, the distances between the internal components of the metering handcart of the present invention are more compact, so that the occupied space of the metering handcart is reduced, especially with a smaller width, which can reduce the overall width of the metering cabinet.

[0043] A shutter mechanism 200 is further provided on the rear side wall of the installation cavity 11. The shutter mechanism 200 includes two safety doors 201, two fixing frames 202, and two driving mechanisms. The two safety doors 201, two fixing frames 202, and two driving mechanisms are configured on both sides of the interface 2 of the metering cabinet (as Figure 11 shown). The driving mechanism includes a driving rod 203 and a reset member 204. A guide groove 205 for sliding cooperation with the safety door 201 is provided on the fixing frame 202. The guide groove 205 is used to guide the two safety doors 201 to slide towards each other to close the interface of the metering cabinet (i.e., cover the interface) or slide away from each other to open the interface of the metering cabinet (i.e., expose the interface). The driving rod 203 is linked with the safety door 201 and is used to drive the safety door 201 to slide along the guide groove 205 in the direction of opening the interface of the metering cabinet. The reset member 204 is linked with the safety door 201 and is used to drive the safety door 201 to move along the guide groove 205 in the direction of closing the interface of the metering cabinet. The driving rod 203 can also be a manual operating rod. When the metering trolley is pulled out, the driving rod 203 can be manually operated to open the safety door 201. In this embodiment, the driving rod 203 is inclined relative to the insertion direction of the metering trolley (as Figure 8 shown). When the metering trolley is pushed into the metering cabinet, both sides of the metering trolley will contact the driving rod 203 and push the driving rod 203 in the direction of opening the safety door 201 to open the safety door 201.

[0044] The guide groove 205 of one of the fixing frames 202 is a straight guide groove, and the two ends of the straight guide groove correspond to the width of the metering cabinet, with a simple structure. The guide groove 205 of the other fixing frame 202 is an L-shaped guide groove. The L-shaped guide groove includes a first straight section 206, a second straight section 207, and an arc connecting section 208. The first straight section 206 is arranged corresponding to the front and back direction of the metering cabinet, the second straight section 207 is arranged corresponding to the width direction of the metering cabinet, and the arc connecting section 208 is connected between the first and second straight sections 207. The guide grooves 205 of the two fixing frames 202 respectively adopt an L-shaped guide groove and a straight guide groove, which can be applicable to the situation where the interface is not at the exact center position of the installation cavity 11. When the interface is very close to the side wall on one side inside the cabinet installation cavity, the fixing frame 202 with an L-shaped guide groove enables the safety door to slide and lean towards this side wall when opening, reducing the occupation of the internal space and avoiding interference between the safety door and the side wall of the installation cavity.

[0045] The fixing frame 202 is of an L-shaped structure. One end of the driving rod 203 is rotatably connected to one end of the fixing frame 202, and the other end of the driving rod 203 is movably connected to the safety door 201. When the driving rod 203 rotates relative to the fixing frame 202, it can drive the safety door 201 to slide along the guide groove 205.

[0046] To reduce jamming, wear, and noise when the drive rod 203 contacts the metering trolley, a pulley 2012 for mating contact with the metering trolley is provided on the drive rod 203. The pulley 2012 is provided at one end of the drive rod 203 in the direction corresponding to the metering trolley.

[0047] The other end of the drive rod 203 further includes a chute 209. The chute 209 is elongated and extends along the length direction of the drive rod 203. Both ends of the chute 209 are closed. The safety door 201 is provided with a sliding seat 2010 that slidably cooperates with the guide groove 205. A slider 20101 is provided at the lower end of the sliding seat 2010. The slider 20101 slidably cooperates with the chute 209. The sliding seat 2010 is movably connected to the chute 209 in cooperation.

[0048] In other embodiments, the reset member can be a linear spring. For example, when the guide groove 205 is a straight guide groove, the linear spring can be provided between the sliding seat 2010 and the fixed frame 202 so that the elastic acting force direction of the linear spring is set at a position corresponding to the sliding direction of the safety door, enabling the safety door to be reset safely and efficiently, and the transmission of the elastic acting force is more direct and reliable. In this embodiment, preferably, the reset member 204 is a torsion spring. The torsion spring is provided at the rotational connection between one end of the drive rod 203 and the fixed frame 202. Using a torsion spring for installation is simpler and more convenient, and combined with the axis of the drive rod 203, the overall structure is more compact.

[0049] In other embodiments, the reset member 204 can also be provided between the safety door 201 and the fixed frame 202 or at the connection between the sliding seat 2010 and the drive rod 203.

[0050] The safety door 201 is provided with indication marks 2013 formed by multiple different colors. For example, circular patterns of yellow, yellow, and green can be used. These indication marks 2013 are distributed at positions corresponding to the interfaces of the metering cabinet when the safety door 201 is closed, facilitating maintenance by the staff.

[0051] The upper part of the safety door 201 is provided with rolling members 2011 that roll in cooperation with the inner wall of the metering cabinet. The lower part of the safety door 201 slidably cooperates with the fixed frame 202. In other embodiments, the positions of the rolling members 2011 and the fixed frame 202 can also be swapped.

[0052] The rolling members 2011 are rollers provided at the upper part of the safety door 201. When the safety door 201 is opened or closed, it will rub against the inner wall of the metering cabinet. Using rollers can reduce the noise generated by the friction between the safety door 201 and the inner wall of the metering cabinet and can also reduce the sway of the safety door 201.

[0053] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A metering cabinet, comprising a cabinet body and a metering trolley. The front side of the cabinet body includes an installation cavity for inserting and installing the metering trolley. Six interfaces are provided on the rear side wall of the installation cavity. The metering trolley includes six contact arms corresponding to and connected and cooperating with the interfaces. The rear side of the cabinet body includes a rear chamber, and six contactor boxes corresponding to and connected with the interfaces are arranged in the rear chamber. It is characterized in that: The six interfaces and the six contact arms are both arranged in a matrix of three rows and two columns. The six interfaces and the six contact arms are respectively arranged at positions biased towards the cabinet body and the metering trolley side. Openings communicating with the rear chamber are provided on both sides of the cabinet body. The side of each contact box includes a connection port corresponding to and connected with the copper busbar. The connection ports of the two columns of contact boxes are respectively arranged corresponding to the opening directions on both sides of the cabinet body. The metering trolley includes a chassis trolley and a trolley frame installed on the chassis trolley. Insulators, contact arms, fusing tubes, two voltage transformers and two current transformers are installed inside the trolley frame. The insulators and the two current transformers are longitudinally distributed on one side inside the trolley frame. The insulator is arranged between the two current transformers. The insulators and the current transformers both include two transversely distributed connection ends, and each connection end is connected with the said contact arm. The two voltage transformers are longitudinally distributed on the other side inside the trolley frame. The two voltage transformers are respectively arranged corresponding to and close to the sides of the two current transformers. Each voltage transformer includes two longitudinally distributed connection ends. One of the two connection ends of the two voltage transformers that are close to each other is connected by a first copper busbar. The other connection ends of the two voltage transformers are connected to the connection ends on the current transformer that is close to them through a fusing tube. The connection end on the current transformer connecting the fusing tube is the connection end arranged in the direction close to the voltage transformer. The first copper busbar and the connection end of the insulator close to the first copper busbar are overlapped through a fusing tube. The connection ends of the two insulators are connected by a second copper busbar arranged transversely.

2. The metering cabinet according to claim 1, characterized in that: A first insulating cover for isolating between the connection end of the insulator and the connection end of the current transformer is provided on the insulator. The first insulating cover includes a notch facing the rear of the trolley. The two connection ends of the insulator and the second copper busbar are all arranged in the notch of the first insulating cover.

3. A metering cabinet according to claim 1, characterized in that: The two connection ends of the voltage transformer are inclinedly distributed relative to the vertical direction. The two connection ends of the two voltage transformers that are close to each other are inclinedly distributed relative to the vertical direction.

4. A metering cabinet according to claim 1, characterized in that: A second insulating cover for isolating between its two connection ends is provided on the voltage transformer. The second insulating cover is arranged on the other connection end of the voltage transformer and is sleeved in cooperation with one end of the fusing tube.

5. A metering cabinet according to claim 1, characterized in that: A shutter mechanism is further provided on the rear side wall of the installation cavity. The shutter mechanism includes two safety doors, two fixing frames and two driving mechanisms. The two safety doors, the two fixing frames and the two driving mechanisms are used to be correspondingly arranged on both sides of the interface. The driving mechanism includes a driving rod and a reset member. A guiding groove for sliding in cooperation with the safety door is provided on the fixing frame. The guiding groove is used to guide the two safety doors to slide towards the approaching direction to close the interface of the metering cabinet or to slide towards the separating direction to open the interface of the metering cabinet. The driving rod is linked with the safety door in cooperation and is used to drive the safety door to slide along the guiding groove in the direction of opening the interface of the metering cabinet. The reset member is linked with the safety door in cooperation and is used to drive the safety door to move along the guiding groove in the direction of closing the interface of the metering cabinet.

6. The metering cabinet according to claim 5, wherein: The guide groove of one of the fixing frames is a straight guide groove, and the two ends of the straight guide groove are set corresponding to the width of the metering cabinet. The guide groove of the other fixing frame is an L-shaped guide groove, and the L-shaped guide groove includes a first straight section, a second straight section and an arc connecting section. The first straight section is set corresponding to the front and back direction of the metering cabinet, the second straight section is set corresponding to the width direction, and the arc connecting section is connected between the first and second straight sections.

7. The metering cabinet according to claim 5, wherein: The fixing frame is of an L-shaped structure. One end of the driving rod is rotatably connected to one end of the fixing frame, and the other end of the driving rod is movably connected to the safety door. When the driving rod rotates relative to the fixing frame, it can drive the safety door to slide along the guide groove. The driving rod is pushed by the metering trolley when the metering trolley is inserted into the metering cabinet. A pulley cooperating with the metering trolley is arranged on the driving rod. The other end of the driving rod further includes a chute. The safety door is provided with a sliding seat cooperating with the guide groove to slide, and the sliding seat is movably connected with the chute in cooperation. The resetting member is a torsion spring, and the torsion spring is arranged at the rotational connection of one end of the driving rod and the fixing frame.

8. The metering cabinet according to claim 5, characterized in that: A plurality of indicating marks composed of different colors are arranged on the safety door, and these indicating marks are distributed at positions corresponding to the interfaces of the metering cabinet when the safety door is closed.

9. The metering cabinet according to claim 5, characterized in that: Rolling members for rolling along the inner wall of the metering cabinet are arranged at the upper / lower part of the safety door, and the lower / upper part of the safety door slides in cooperation with the fixing frame.

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