CN103151754B - A connection method and device for the incoming and outgoing lines of a low-voltage cable branch box - Google Patents

Abstract

A low-voltage cable branch box inlet and outlet wire connecting mode and device adopt a modular structure, the inlet and outlet wire connection of a low-voltage cable branch box is divided into a bus system, an inlet wire module and an outlet wire module, the inlet wire is connected to the bus system through the inlet wire module, the outlet wire is also connected to the bus system through the outlet wire module, and the inlet and outlet wire connection adopts the steps that an inlet wire cable is connected to the inlet wire module firstly, and then the module is connected to the bus system; meanwhile, the outgoing cable is connected to the outgoing module, and then the outgoing module is connected to the bus system, so that the whole connection of the incoming and outgoing lines is completed. The invention has high protection level, and the load switch can combine load current and certain short-circuit current; obvious disconnection points are provided, and the probability of electric shock accidents is reduced; the plug-in installation is simple and convenient; the reliability is high, and the power failure area is reduced during the failure; the movable part is arranged, so that the device is maintenance-free and can be suitable for severe environments; the modularization is easy to expand.

Description

A connection method and device for the incoming and outgoing lines of a low-voltage cable branch box

technical field

The invention relates to an electrical connection method and device, in particular to a connection method and device for incoming and outgoing lines in a low-voltage cable branch box, mainly used for cable connection of incoming and outgoing lines outdoors, in cable wells and in corridors.

Background technique

Cable branch box With the development of distribution network cabling process, when the distribution of independent loads with small capacity is relatively concentrated, cable branch boxes have been widely used to connect multiple branches of cables, because the branch box cannot directly operate each channel. It is only used as a cable branch, and the main function of the cable branch box is to branch or transfer cables. The so-called cable branching refers to: there are many small-area cables on a relatively long-distance line, which often leads to waste of cable use. Therefore, when going out to the power load, the main large cable is often used to go out, and then when it is close to the load. , Use the cable branch box to divide the main cable into several small-area cables, and the small-area cables are connected to the load. This wiring method is widely used in power supply for street lamps in urban power grids, and power supply for small users. The so-called cable transfer means: on a relatively long line, the length of the cable cannot meet the requirements of the line, then a cable connector or a cable transfer box must be used. Usually, a cable intermediate connector is used for a short distance, but the line is relatively long. Sometimes, according to experience, on the cable line above 1000M, if there are multiple intermediate connectors in the middle of the cable, in order to ensure safety, the cable branch box will be considered for transfer. Cable branch boxes have been widely used outdoors, and a large number of them have begun to be used in low-voltage networks. The selection of cable branch boxes follows the rapid development of the modernization of the power industry, and the transformation of the power grid has started in an all-round way. When the underground main line cable needs to realize multi-circuit distribution and distribution at a certain distance, it is an economical, convenient and safe way to use the cable branch box as an important supporting equipment for power distribution.

With the extensive use of cables in low-voltage AC, load distribution requires a large number of low-voltage cable branch boxes. These branch boxes are mainly installed in: ① outdoors, ② cable wells, and ③ corridors; these places are due to large temperature and humidity changes, dusty, and ventilation Poor, harsh environment, no dedicated maintenance. Therefore, these low-voltage cable branch boxes are required to ensure the following performance:

①Reliable safety protection;

② Can withstand harsh environmental influences;

③ as little maintenance as possible;

④ Fast and convenient installation;

⑤ When the number of users increases, it can be easily expanded;

⑥When a fault such as short circuit/overload occurs, it is required to limit the impact to a minimum range to reduce the blackout area;

⑦ It is convenient to find faults.

However, a large number of distribution boxes currently in use are directly connected to copper bars without protection, which will lead to:

①In case someone touches the exposed copper wire, it will directly lead to the danger of electric shock;

② If any branch circuit breaks down, the whole branch box is in crisis;

③ When you want to expand the capacity and increase the outgoing line, the entire branch box will be powered off, and then the copper bars will be re-arranged;

④ If a fault occurs, it is very troublesome to find it, and it must be searched one by one.

Therefore it is necessary to improve this. Some relevant patents were found through domestic patent literature search, and the most relevant patents to the present invention mainly include the following items:

1. The patent number is CN201120015501.9, and the patent name is a utility model patent of "a cable branch box". This patent provides a cable branch box, which includes a box body, and the two sides of the box body are vertically fixed with insulating bus bars There are copper bars between the insulated bus bar support frames, wiring boards are mounted on the copper bars, and cable connection terminals are arranged on the wiring boards. At the same time, independent wiring boards can be used for the incoming and outgoing wires, and the incoming and outgoing cables do not need crimping terminals, and can be directly connected to the connecting terminals on the wiring board. In this way, the entire incoming line and outgoing line unit is in a closed structure, without exposed live parts, and has good safety performance. Moreover, the copper bar of the cable branch box of the utility model does not need to be bent, and the precision requirements for the design and installation of the copper bar are relatively low. However, this patent still does not solve the problem that when you want to expand the capacity and increase the outgoing line, the entire branch box will be powered off, and then the copper bars will be re-arranged; and the joints used are not ordinary joints, so the connection is still more troublesome and not easy. Replacement, the joint part is still violent, which is likely to cause electric shock accidents.

2. The patent number is CN201020650124, and the patent name is a utility model patent of "a cable branch box". The T-shaped plug on the casing, the incoming cable and the outgoing cable connected to the box are respectively connected to the T-shaped plug, and the incoming cable passes through the casing and the T A type plug is connected with the outgoing cable to form a branching circuit, and the bushing is a branching bushing, and the branching bushing has at least three incoming and outgoing line sockets, and at least one of the incoming and outgoing line sockets is inserted and fixed with a grounding device. However, this patent still does not solve the problem of exposed copper cables, and the structure is very complicated, which is inconvenient for installation and replacement, especially troublesome for capacity expansion.

3. The patent number is CN201020172082.5, and the patent name is a utility model patent named "low voltage cable branch box". This patent discloses a low voltage cable branch box, which includes a box body, a box cover, and copper busbars and Circuit breaker; it is characterized in that it also includes a closed busbar system for enclosing copper busbars; the box body is a non-metallic insulating shell made of unsaturated polyester resin glass fiber reinforced molding compound material; at the same time, the inside of the box body The copper busbar is sealed with an insulated closed busbar system to prevent the possibility of artificial electric shock for operators, making it safe to operate and ensuring the safe operation of power users; and the busbar system is made of unsaturated polyester resin glass fiber reinforced plastic shell, which has a novel structure and excellent sealing performance. Good; it has the advantages of convenient installation, low cost, beautiful appearance, strong versatility, flexible and convenient disassembly and assembly. Although this patent solves the problem of exposed copper bars, the patent still does not solve the problem of how to expand the capacity, which cannot be expanded, and if a single line is damaged, all must be replaced.

4. The patent number is CN200920180719.2, and the patent name is "low voltage cable branch box". , there is a mounting bracket in the box, and several switches with fuses are installed on the mounting bracket; the three-phase incoming line is introduced from an opening on the bottom of the box, and is divided into groups of three-phase outgoing branch circuits, from the bottom of the side of the box. Leading out from other openings, each phase incoming line is respectively connected in series with a switch with a fuse, and each phase outgoing line of each group of three-phase outgoing line branches is also connected in series with a switch with a fuse. However, this patent still adopts common copper bars for incoming and outgoing lines, which does not solve the problem of exposed copper bars, and is prone to the risk of electric shock when the lines go out.

To sum up, the existing low-voltage cable branch boxes all have the above-mentioned problems to varying degrees, so it is still necessary to further improve this.

Contents of the invention

The object of the present invention is to propose a connection method and device for the incoming and outgoing lines of the low-voltage cable branching box without exposed incoming and outgoing lines and convenient for expansion and installation.

In order to achieve the purpose of the present invention, the proposed technical implementation plan is: a low-voltage cable branch box inlet and outlet line connection method, which adopts a modular structure, and divides the low-voltage cable branch box inlet and outlet line connections into a bus system, an incoming line module and an outgoing line module Three parts, the incoming line is connected to the busbar system through the incoming line module, and the outgoing line is also connected to the busbar system through the outgoing line module. The incoming and outgoing line connection is to first connect the incoming line cable to the incoming line module, and then connect the incoming line module to the busbar system; At the same time, connect the outgoing cable to the outgoing module, and then connect the outgoing module to the busbar system to complete the entire connection of the incoming and outgoing lines.

Further, the connection between the incoming line module and the busbar system is a plug-in connection, and the incoming line module is a module that can be inserted or pulled out independently. When the incoming line module is inserted into the busbar system, the busbar system is charged;

Further, the connection between the outlet module and the bus system is also a plug-in connection, the outlet module is a module that can be inserted or pulled out independently, and can output power from the bus system after the outlet module is inserted into the bus system;

Further, the plug-in connection of the incoming line is to install an elastic power interface on the incoming line module, which can be inserted or pulled out on the copper busbar of the busbar system, and the tension is controlled by the spring;

Further, the outlet plug-in connection is to install an elastic power interface on the outlet module, which can be inserted or pulled out on the copper busbar of the busbar system, and the elasticity is controlled by the spring;

Further, the outlet module is a load switch with a fuse, and the upper cover with the fuse and the base with the plug-in power interface are combined together in a hinged manner to form an independent module; each fuse contact knife and A set of arc extinguishing sheets are respectively installed in the spaces corresponding to the positions of the contacts on the base to form an arc extinguishing chamber.

Further, the bus bar system is a modular structure, including a copper bus bar, a bus bar installation box, and a plastic grid. The copper bus bar is a sheet structure, and the copper bus bar is inserted into the bus bar installation box and sealed by an insulating partition; the bus bar The system is formed by a combination of multiple busbar installation boxes. The busbar installation boxes are connected by plastic grids to form a grid-like envelope structure, which wraps the busbars in the middle and is installed on the low-voltage cable by fasteners. Inside the branch box.

The low-voltage cable branch box according to the above-mentioned connection method includes three parts: the busbar system, the incoming line module and the outgoing line module. The incoming line is connected to the busbar system through the incoming line module, and then the busbar system is output through the outgoing line module.

Further, the bus bar system includes a copper bus bar, a bus bar installation box, and a plastic grid; the copper bus bar is a sheet structure, and the copper bus bar is inserted in the bus bar installation box, and is inserted on the back side by an insulating partition to seal the copper bus bar The busbar system is formed by a combination of multiple busbar installation boxes, and the busbar installation boxes are connected by plastic grids to form a grid-like envelope structure, wrapping the copper busbars in the middle and installing them with fasteners In the low-voltage cable branch box.

Further, the incoming line module is composed of a pressure plate type incoming line clamp and a plug-in power interface. The incoming line clamp has a fixed line clamp and a movable line clamp, and the active line clamp is clamped or loosened by a screw. cable. The plug-in power interface can be plugged in or pulled out on the copper busbar of the bottom plate, and the tension is controlled by the spring;

Further, the outlet module is a load switch with a fuse, and the upper cover with the fuse and the base with the plug-in power interface are combined together in a hinged manner to form an independent module; each fuse contact knife and A set of arc extinguishing sheets are respectively installed in the spaces corresponding to the positions of the contacts on the base to form an arc extinguishing chamber.

The advantages of the present invention are:

1. Safe, with a high protection level, the load switch can separate and close the load current and a certain short-circuit current;

2. There is an obvious break point to reduce the probability of electric shock accidents;

3. Plug-in installation, simple and convenient;

4. High reliability, reducing the blackout area in case of failure;

5. Few moving parts, maintenance-free, suitable for harsh environments;

6. Modularization is easy to expand;

7. It is easy to find the fault point;

8. Small footprint, low cost, easy to popularize.

Description of drawings

Fig. 1 is the structural representation of an embodiment of the present invention;

Fig. 2 is the B-B sectional structure schematic diagram of an embodiment of the present invention;

Fig. 3 is the A-A sectional structure schematic diagram of an embodiment of the present invention;

Fig. 4 is a schematic side view of an embodiment of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

It can be seen from the accompanying drawings that the present invention relates to a connection method for the incoming and outgoing lines of a low-voltage cable branch box, which adopts a modular structure and divides the connection of the incoming and outgoing lines of the low-voltage cable branch box into three parts: a busbar system, an incoming line module, and an outgoing line module. The line is connected to the busbar system through the incoming line module, and the outgoing line is also connected to the busbar system through the outgoing line module. The incoming line is connected to the incoming line module first, and then the module is connected to the busbar system; at the same time, the outgoing line is connected to the outgoing line module. Then connect the outgoing line module to the busbar system to complete the entire connection of incoming and outgoing lines.

Further, the connection between the incoming line module and the busbar system is a plug-in connection, and the incoming line module is a module that can be inserted or pulled out independently. When the incoming line module is inserted into the busbar system, the busbar system is charged;

Further, the connection between the outlet module and the bus system is also a plug-in connection, the outlet module is a module that can be inserted or pulled out independently, and can output power from the bus system after the outlet module is inserted into the bus system;

Further, the plug-in connection of the incoming line is to install a pressure plate type incoming line clamp and a plug-in power interface on the incoming line module. The incoming line clamp has a fixed line clamp and a movable line clamp, and the movable line is tightened by screws. Clamp or loosen the incoming cable; the plug-in power interface on the incoming module matches the plug-in power socket on the busbar system, and can be inserted or pulled out on the copper busbar of the bottom plate, and the spring controls the tightness ;

Further, the outlet plug-type connection is that the outlet module is provided with a plug-in power interface that matches the plug-in power socket on the busbar system. The elastic movable clamp clamps or loosens the incoming cable; the plug-in power interface on the outlet module matches the plug-in power socket on the busbar system, and can be inserted or pulled out on the copper busbar of the bottom plate. tightness control;

Further, the outlet module is a load switch with a fuse, and the outlet is connected to the busbar system through the load switch with a fuse; the upper cover with a fuse and the base with a plug-in electrical interface are hinged Combined together, an independent module is formed; a set of arc extinguishing plates is installed in the space corresponding to the position of each fuse contact knife and the contact on the base to form an arc extinguishing chamber.

Further, the bus bar system is a modular structure, including a copper bus bar, a bus bar installation box, and a plastic grid. The copper bus bar is a sheet structure, and the copper bus bar is inserted into the bus bar installation box and sealed by an insulating partition; the bus bar The system is formed by a combination of multiple busbar installation boxes. The busbar installation boxes are connected by plastic grids to form a grid-like envelope structure, which wraps the busbars in the middle and is installed on the low-voltage cable by fasteners. Inside the branch box.

The low-voltage cable branch box according to the above-mentioned connection method includes three parts: the busbar system, the incoming line module and the outgoing line module. The incoming line is connected to the busbar system through the incoming line module, and then the busbar system is output through the outgoing line module.

Further, the busbar system is a modular structure, including copper busbars, busbar installation boxes, and plastic grids; the copper busbars are sheet-like structures, and the copper busbars are inserted into the busbar installation boxes and inserted on the back by insulating partitions, Enclose the copper busbar; the busbar system is formed by a combination of multiple busbar installation boxes, and the busbar installation boxes are connected by plastic grids to form a grid-like envelope structure, wrapping the copper busbar in the middle, and Installed in the low-voltage cable branch box through fasteners.

Further, the busbar system is composed of multiple busbar installation boxes arranged and combined according to the number of power supply phases. The multiple busbar installation boxes of each phase are combined through a plastic grid to form a long busbar installation box module, and then the busbar The installation box module is installed on the low-voltage cable branch box body through fasteners.

Further, the incoming line module is composed of a pressure plate type incoming line clamp and a plug-in power interface. The incoming line clamp has a fixed line clamp and a movable line clamp, and the active line clamp is clamped or loosened by a screw. cable. The plug-in power interface can be inserted or pulled out on the copper busbar of the bottom plate, and the tension is controlled by the spring.

Further, the outlet module is a load switch with a fuse, and the upper cover with the fuse and the base with the plug-in power interface are combined together in a hinged manner to form an independent module; each fuse contact knife and A set of arc extinguishing sheets are respectively installed in the spaces corresponding to the positions of the contacts on the base to form an arc extinguishing chamber.

The advantages of the present invention are:

1. Safe, with a high protection level, the load switch can separate and close the load current and a certain short-circuit current;

2. There is an obvious break point to reduce the probability of electric shock accidents;

3. Plug-in installation, simple and convenient;

4. High reliability, reducing the blackout area in case of failure;

5. Few moving parts, maintenance-free, suitable for harsh environments;

6. Modularization is easy to expand;

7. It is easy to find the fault point;

8. Small footprint, low cost, easy to popularize.

Among them, the busbar system has the following characteristics:

1. The protection level is IP20, which can ensure the safety of life;

2. The length of the copper busbar depends on the requirements of different users;

3. The surface of the copper busbar is silver-plated, which has good electrical conductivity;

4. The allowable current is 400-630A;

5. The incoming and outgoing modules can be installed without drilling, which is fast and convenient.

The incoming module features are:

1. The load current can be separated and combined;

2. With fuse protection;

3. No need to press the nose;

4. Plug-in quick installation;

The outlet module features are:

1. The load current can be separated and combined;

2. With fuse protection;

3. No need to press the nose;

4. Plug-in quick installation;

5. Easy to expand;

Embodiment one

A connection method for the incoming and outgoing lines of a low-voltage cable branch box, which adopts a modular structure, and divides the connection of the incoming and outgoing lines of the low-voltage cable branch box into three parts: a busbar system 1, an incoming line module 2, and an outgoing line module 3. The low-voltage cable branch box enters and exits The line connection is three busbars (three phases); including a set of incoming line module 2 (three phases) and multiple sets of outgoing line modules 3 (each set of three phases), which can be divided into one input and three output, one input and four output, and one Five inlets and one outlet, one inlet and six outlets, etc., adopt modular combination; such as a branch box of a real estate, one outlet is installed in each corridor, and there are several outlets in several corridors. Users can choose one inlet and several outlets according to the number of corridors, and Choose the length of the busbar according to the number. The incoming line is connected to the busbar system 1 through the incoming line module 2, and the outgoing line is also connected to the busbar system 1 through the outgoing line module 3. The incoming and outgoing lines are connected by first connecting the incoming line cable to the incoming line module, and then connecting the module to the busbar system 1; at the same time Connect the outgoing cable to the outgoing module 3, and then connect the outgoing module 3 to the busbar system 1 to complete the entire connection of the incoming and outgoing lines.

Further, the connection between the incoming line module 2 and the busbar system 1 is a plug-in connection, and the incoming line module 2 is a module that can be inserted or pulled out independently. When the incoming line module is inserted into the busbar system 1, the busbar system is charged. ;

Further, the connection between the outlet module 3 and the busbar system 1 is also a plug-in connection, the outlet module 3 is a module that can be inserted or pulled out independently, when the outlet module 3 is inserted into the busbar system 1, it can be connected from the busbar system 1 output power;

Further, the plug-in type connection of the incoming line is to install the plug-in plug-in electrical interface 4 on the incoming line module 2 to match the copper busbar 5 on the busbar system, and can be connected to the copper busbar installed on the bottom plate Insert or pull out on 5, the spring controls the tightness of the plug-in plug-in power interface 4; the incoming cable clamp 11 is installed in the incoming line module 2, and the incoming line module 2 is fixed on the box body of the low-voltage cable branch box by bolts superior.

Further, the outlet plug-type connection is that the outlet module 3 is provided with an outlet plug-type power interface 6 that matches the copper busbar 5 on the bus system 1; the outlet plug-type power interface 6 on the outlet module It matches the copper busbar on the busbar system, and can be inserted or pulled out on the copper busbar 5 of the bottom plate, and the spring controls the tightness of the outlet plug-type power interface 6;

Further, there is a fuse 7 in the outlet module 3, and the outlet is connected to the busbar system 1 through the fuse 7; the upper cover 10 of the fuse 7 and the base 8 with the plug-in electrical interface 6 are hinged 9 are combined together in a hinged manner to form an independent module; a set of arc extinguishing plates 12 is installed in the space corresponding to the position of the contact blade of each fuse 7 and the contact on the base 8 to form an arc extinguishing chamber.

Further, the busbar system 1 is a modular structure, the copper busbar 5 is installed in the busbar installation box 13, the busbar installation box 13 is a plurality of combined grid-like envelope structures, and the copper busbar 5 is wrapped in the middle , an insulating partition 16 is provided at the part where the copper busbar 5 is in contact with the box bracket 15 of the low-voltage cable branch box. Installed on the box body support 15 of the low-voltage cable branch box.

Claims (4)

1. a low-voltage cable junction box, is characterized in that, adopt modularization line structure, comprise bus-bar system, incoming line module and outlet module three parts, inlet wire is connected to bus-bar system by incoming line module, then is exported by outlet module by bus-bar system; Described bus-bar system is modular construction, comprises copper busbar, bus mounting box, plastic lattices; Copper busbar is laminated structure, and copper busbar is inserted in bus mounting box, and is inserted in the copper busbar back side by insulating barrier, copper busbar is closed; Bus-bar system is combined to form by multiple bus mounting box, coupled together by plastic lattices between bus mounting box and bus mounting box, be formed as lattice-shaped envelope structure, copper busbar is wrapped in centre by bus mounting box, and bus mounting box is arranged in low-voltage cable junction box by securing member.

2. low-voltage cable junction box as claimed in claim 1, it is characterized in that, described bus-bar system is that multiple bus mounting box is according to power supply number of phases permutation and combination, multiple bus mounting boxs of each phase are combined to form a rectangular bus mounting box module by plastic lattices, then bus mounting box module are installed on low-voltage cable junction box casing by securing member.

3. low-voltage cable junction box as claimed in claim 2, it is characterized in that, described incoming line module is made up of presser type inlet wire chuck and plug-in energising interface, and presser type inlet wire chuck has fixing clamper and movable wire clamp, is clamped by screw degree of tightness activity wire clamp or is unclamped inlet wire cable; Plug-in energising interface can inject or extract in the copper busbar of base plate, controls degree of tightness by spring.

4. low-voltage cable junction box as claimed in claim 1, is characterized in that, described outlet module is the on-load switch of band fuse, is combined by the base of band plug-in energising interface and the upper cover articulated manner of band fuse and arc control device.