CN109616989B

CN109616989B - Branch box on post

Info

Publication number: CN109616989B
Application number: CN201811477121.XA
Authority: CN
Inventors: 刘鹏; 孟红; 任立新; 刘长勇; 梁武震
Original assignee: State Grid Corp of China SGCC; State Grid Beijing Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; State Grid Beijing Electric Power Co Ltd
Priority date: 2018-12-05
Filing date: 2018-12-05
Publication date: 2020-06-09
Anticipated expiration: 2038-12-05
Also published as: CN109616989A

Abstract

The invention discloses a branch box on a column, which comprises a box body, a first bus bar, a second bus bar and an insulating plate, wherein the first bus bar is arranged on the box body; the box body is of a cuboid structure, and cabinet doors are arranged on the front side and the back side of the box body; the bottom of the box body is provided with a plurality of through holes for leading the bus into the box body or leading the service line out of the box body; the insulation board is vertically fixed in the box body, and four arc-shaped notches are formed in the top of the insulation board; three first bus bars and one second bus bar are fixed on the insulating plate; the three first bus bars respectively correspond to A, B, C three phases of the main lead; the second bus bar corresponds to a zero line, a plurality of wiring terminals are arranged on the three-phase bus bar respectively, a plurality of wiring terminals in corresponding number are arranged on the zero line bus bar, and the service wires are connected to the bus bar and led out through the wiring holes below the box body; lead off a four-core aluminium system cable from leading wire, the cable adopts ann ordinary fastener to be connected with leading wire, and the other end inserts in the feeder pillar through box below entrance hole, arranges or second generating line row electric connection with the first generating line that corresponds.

Description

Branch box on post

Technical Field

The invention belongs to the technical field of power systems, and particularly relates to an on-column branch box.

Background

In suburb areas and single-storey residential areas in rural areas, a plurality of service lines can be led down from one telegraph pole to a user home for wiring convenience, and the current widely used mode for connecting the leading line and the service line is as follows: the existing connecting method has some defects in long-term operation, so that faults are more and difficult to find, and the connecting method needs to be improved.

The method for connecting the main conductor and the service conductor widely used at present comprises the connection through a low-voltage distribution box and a copper-aluminum service connector, and the following technical problems exist

1) The main conductor is easy to be damaged in the installation process of the copper-aluminum user wire clamp, so that the service life of the line is influenced;

2) a plurality of copper-aluminum service connecting wire clamps are required to be installed when a plurality of service connecting wires are connected in a short distance, so that the cost is high, and the insulation of the main lead wire is damaged for many times in the installation process;

3) the copper-aluminum service connection wire clamp can only be connected with one service connection wire, the wiring is disordered, and the operation and maintenance difficulty is increased.

Disclosure of Invention

The invention aims to provide an on-column branch box to solve the technical problem. The invention connects a plurality of service wires to one position of the main conductor, avoids repeated stripping from causing repeated damage to the main conductor, and has beautiful appearance and convenient maintenance.

In order to achieve the purpose, the invention adopts the following technical scheme:

a column branch box comprises a box body, a first bus bar, a second bus bar and an insulating plate;

the box body is of a cuboid structure, and cabinet doors are arranged on the front side and the back side of the box body; the bottom of the box body is provided with a plurality of through holes for leading the bus into the box body or leading the service line out of the box body;

the insulation board is vertically fixed in the box body, and four arc-shaped notches are formed in the top of the insulation board; three first bus bars and one second bus bar are fixed on the insulating plate; the three first bus bars respectively correspond to A, B, C three phases of the main lead; the second bus bar corresponds to a zero line, a plurality of wiring terminals are arranged on the three-phase bus bar respectively, a plurality of wiring terminals in corresponding number are arranged on the zero line bus bar, and the service wires are connected to the bus bar and led out through the wiring holes below the box body;

lead off a four-core aluminium system cable from leading wire, the cable adopts ann ordinary fastener to be connected with leading wire, and the other end inserts in the feeder pillar through box below entrance hole, arranges or second generating line row electric connection with the first generating line that corresponds.

Further, three first busbar rows and a second busbar row all are equipped with the generating line stiff end, and the generating line stiff end dislocation is arranged to align with four convex breach.

Furthermore, the first bus bar row is in a convex shape, the bus fixing end is positioned at the top, and the four wiring ends are positioned at the lower part; the second bus bar row is linear, and all the wiring terminals and the bus fixing ends are positioned in one row; all the wiring ends are square mounting holes arranged on the bus bar.

Furthermore, the service wire is fixed on the first bus bar or the second bus bar through a wire pressing screw;

the line pressing screw comprises a screw; the screw comprises a square head and a threaded rod, and a circular wire guide hole is formed in the middle of the square head and used for placing a wire; the threaded rod is connected to the side wall of the square head;

the nut is used for being matched with the threaded rod to fix the lead and the wiring end;

furthermore, the extending direction of the threaded rod is perpendicular to the extending direction of the circular wire guide hole.

Further, the inner wall of the round wire hole is provided with threads; the terminal has a square mounting hole.

Furthermore, in the mounting state, the lead passes through the circular lead hole, and the square head of the screw is inserted into the square mounting hole of the wiring terminal; the nut is screwed on the threaded rod to fix the lead and the wiring terminal.

Furthermore, gaps between two sides of the square head parallel to the extending direction of the lead and the square mounting hole 30 are all A, and gaps between two sides of the square head perpendicular to the extending direction of the lead and the square mounting hole 30 are all B; a is less than B; a gasket is arranged between the nut and the wiring end and sleeved on the threaded rod; be the quad slit in the middle of the gasket, the size of quad slit is greater than the square head size of screw, can supply square head to pass from the quad slit.

Furthermore, the first bus bar and the second bus bar are both electrically connected with a one-input-multiple-output service cable clamp;

the one-input and multi-output service wire clamp comprises a main wire clamp and a service wire clamp which are connected with each other;

the main wire clamp comprises a first block body, wherein an accommodating cavity is formed in the first block body in a concave mode, and a wire pressing wedge block and a locking block which are matched with each other are installed in the accommodating cavity; the upper part of the first block body is provided with a semicircular hook; the semicircular hook is positioned right above the accommodating cavity;

the line pressing wedge block is a right-angle trapezoidal wedge block, the locking block is a right-angle triangular block body, and the inclined surfaces of the line pressing wedge block and the locking block are matched with each other; the big end face of the line pressing wedge block is upward, and a groove is concavely arranged for fixing the four-core aluminum cable;

a first threaded hole is formed in the side wall of the first block body, and a first bolt is installed in the first threaded hole; a second threaded hole is formed in the side wall, opposite to the first bolt, of the locking block; the external thread of the first bolt is opposite to the internal thread of the second threaded hole on the locking block;

a third threaded hole is formed in the position, opposite to the small end of the line pressing wedge block, of the bottom of the first block body, a second bolt is installed in the third threaded hole, and the line pressing wedge block can be pushed to move up and down by screwing the second bolt;

the four-core aluminum cable is clamped between the groove at the top of the line pressing wedge block and the semicircular hook;

the service line clamp comprises a second block body fixed beside the first block body, and the first block body and the second block body are of split structures or integrated structures;

the bottom of the second block body is provided with a plurality of wire clamp round holes, the side wall of each wire clamp round hole is provided with a fourth threaded hole, and a third screw is installed in each fourth threaded hole; the service wire is pressed in the corresponding wire clamp round hole through a third screw.

Furthermore, uneven ripples are arranged on the inclined planes matched between the locking block and the line pressing wedge block.

Compared with the prior art, the invention has the following beneficial effects:

1) the appearance is beautiful, and the wiring and the maintenance are convenient;

2) the column is arranged on the column, so that the ground space is saved;

3) a plurality of user wires can be led down from one position of the main lead wire, and the damage to the main lead wire is small;

4) the branch box is simple to install and high in construction efficiency;

5) low cost and repeated use.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view showing a structure in which a branch box on a pole is installed on a utility pole according to the present invention;

FIG. 2 is a schematic diagram of the arrangement of busbars inside a branch box on a column;

FIG. 3 is a schematic view of a structure of a wire pressing screw;

FIG. 4 is a cross-sectional view of the crimping screw of FIG. 3;

FIG. 5 is a front view of the state of installation of the crimping screw;

FIG. 6 is a cross-sectional view of the structure shown in FIG. 5;

FIG. 7 is a cross-sectional view of a one-in-multiple-out service clamp;

fig. 8 is an outline view of a one-in-multiple-out service clamp.

Detailed Description

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.

Example 1

Referring to fig. 1, the present invention provides an on-pole branch box 101, which can be fixed to a utility pole 200 by a clip, for connecting a main conductor 300 to a plurality of service lines 100 and leading out of the on-pole branch box 101.

Referring to fig. 2, the pillar upper branch box 101 includes a box body, a first bus bar 102, a second bus bar 103, and an insulating plate 105; the box is the cuboid structure, and its front and back all are equipped with the cabinet door, and the homoenergetic is opened or is closed for the electrician carries out the wiring operation. The bottom of the box body is provided with a plurality of through holes for leading the bus into the box body or leading the service line out of the box body.

The insulating plate 105 is vertically fixed in the box body, and four arc-shaped notches 104 are formed in the top of the insulating plate 105; three first bus bars 102 and one second bus bar 103 are fixed to the insulating plate 105. The three first bus bars 102 correspond to A, B, C three phases of the main conductor, respectively; the second busbar 103 corresponds to a zero line, a plurality of wiring terminals are arranged on the three-phase busbar, a plurality of wiring terminals corresponding to the number of the three-phase busbar are arranged on the zero line busbar, the service wires are connected to the busbar and led out through four wire outlet holes below the box body, and the led-out service wires 100 are connected to users through two groups of cross arms below the branch box.

Three first busbar 102 and a second busbar 103 all are equipped with the generating line stiff end, and the generating line stiff end dislocation is arranged to align with four arc-shaped breach 104, be convenient for the wiring.

The first busbar 102 is convex, the busbar fixing end is positioned at the top, and the four wiring terminals are positioned at the lower part; the second bus bar row 103 is a straight line type, and all the terminals and bus bar fixing ends are located in one row. All of the terminals are square mounting holes 30 provided in the busbar.

Lead off a four-core aluminium system cable from leading wire, the cable adopts ann ordinary fastener to be connected with leading wire 300, and in the other end crimping threading nose passed through box below entrance hole inserts the feeder pillar, arrange upper portion generating line stiff end around generating line from the circular arc breach 4 in insulation board 5 tops, fixed respectively with the screw.

The service line 100 is typically 16mm in cross-sectional area²Or 25mm²The copper conductor is fixed on the bus bar by using a line pressing screwThe above.

Referring to fig. 3 and 6, the pressing screw includes a screw 1, a nut 4 and a washer 5.

The screw 1 comprises a square head 11 and a threaded rod 12, and a circular wire guide hole 6 is formed in the middle of the square head 11 and used for placing a wire; the threaded rod 12 is connected to the side wall of the square head 11, and the extending direction of the threaded rod 12 is perpendicular to the extending direction of the round wire guide hole 6. The nut 4 and the washer 5 are intended to cooperate with the threaded rod 12.

The inner wall of the round wire hole 6 is provided with threads for increasing the friction force between the wire 2 and the wire hole 6, and the wire 2 is not easy to fall off from the wire hole 6.

The terminals 3 of the device are provided with square mounting holes 30.

During installation, a wire penetrates through the circular wire hole 110, the square head 11 of the screw 1 is inserted into the square mounting hole 30 of the wiring terminal 3, gaps of about 0.2mm are respectively formed between the left side and the right side of the inserted square head 11 and the square mounting hole 30, gaps of about 1.5mm are respectively formed between the upper side and the lower side of the inserted square head 11, one end of the screw 1 is fixed in the screwing process, and the nut 4 is screwed to enable the wire to be in compression joint with the wiring terminal 3 of the equipment.

Under the condition that the screw is corroded and is difficult to screw, the lead 2 can be cut along the upper surface and the lower surface of the square head 11, and the screw 1 can fall off from the square mounting hole 30.

The middle of the gasket 5 is square, the square hole is slightly larger than the square head 11 of the screw, the square head 11 of the screw 1 can penetrate through the gasket, the gasket can adapt to the condition that the diameter of the lead hole of the terminal row is smaller than the diameter of the lead, and the quantity of the gaskets is increased or decreased according to the condition that the diameters of the terminal row and the lead are different.

The terminal 3 is the first bus bar 102 followed by the second bus bar 103.

Example 2

For some service environments with strict space requirements, a sufficient number of terminals cannot be arranged on the busbar to meet the branch requirements. At the moment, one-input-multiple-output wiring clamp is installed on the busbar and is matched with the busbar wiring terminal for use, so that more wiring terminals can be provided in the same space, more branches are formed and output to users, the requirements of the users are met, and the occupied space is smaller.

In the embodiment, the bus fixing ends of the first bus bar 102 and the second bus bar 103 in the embodiment 1 are replaced by one-input multi-output service connecting wire clamps; the one-in-multiple-out service cable clamp is fixed on the corresponding first bus bar 102 or second bus bar 103 through screws or welding.

A one-in-multiple-out service clamp includes a main wire clamp 402 and a service wire clamp 400 connected to each other.

The main line clamp 402 comprises a first block body, wherein an accommodating cavity is formed in the first block body in a concave manner, and a line pressing wedge 403 and a locking block 410 which are matched with each other are installed in the accommodating cavity; the upper part of the first block body is provided with a semicircular hook 404; the semicircular hook 404 is located right above the accommodating cavity.

The line pressing wedge 403 is a right-angle trapezoidal wedge, the locking block 410 is a right-angle triangular block, and the inclined surfaces of the line pressing wedge 403 and the locking block are matched with each other; the big end face of the pressing line wedge block 403 faces upwards, and a groove is concavely arranged for fixing the bus.

A first threaded hole is formed in the side wall of the first block body, and a first bolt 401 is installed in the first threaded hole; a second threaded hole 409 is formed in the side wall, opposite to the first bolt 401, of the locking block 410; the external thread of the first bolt 401 is opposite to the internal thread of the second threaded hole 409 on the locking block 410, that is, when the first bolt 401 is tightened, the screw cannot enter the second threaded hole 409 on the locking block 410, and only has a force pressing the second threaded hole 409 to the right side, and when the first bolt 401 is loosened, the screw enters the second threaded hole 409 to pull out the locking block 410 to the left.

The bottom of the first block body is provided with a third threaded hole opposite to the small end of the line pressing wedge 403, a second bolt 407 is mounted in the third threaded hole, and the line pressing wedge 403 can be pushed to move up and down by screwing the second bolt 407.

The pressing line wedge block 403 is pushed to move upwards by screwing the second bolt 407, the bus is clamped between the groove at the top of the pressing line wedge block 403 and the semicircular hook 404, and then the first bolt 401 is screwed to push the locking block 410 to move rightwards to compress the pressing line wedge block 403, so that a double-locking structure is formed.

Uneven ripples 408 are arranged on the inclined plane matched between the locking block 410 and the line pressing wedge block 403, so that the friction force between the two block bodies is increased, and the bus can be compressed even if the line pressing wedge block 403 is loosened by screws.

The service line clamp 400 includes a second block fixed to a side of the first block, and the first block and the second block may be separate structures or integrated structures.

The bottom of the second block body is provided with four wire clamp round holes 406 (a plurality of wire clamp round holes can be arranged as required), the side wall of each wire clamp round hole 406 is provided with a fourth threaded hole, and a third screw 405 is installed in each fourth threaded hole; the service connection wire clamp adopts single screw crimping, puts into the service connection wire and presss from both sides the wire clamp round hole 406 in and fix the service connection wire through screwing up third screw 405, for the even four line ball screws of atress distribute in positive one, the reverse side is one, the side is two.

The main line wire clamp and the service line wire clamp are connected into an integrated structure, one bus can be connected with four service lines, space is saved, and if a plurality of service lines are needed, the bus can be fixed on the connecting end of the bus bar by adopting a fixing mode shown in the attached figures 3-6.

The one-input and multi-output service cable clamp has the advantages of reliable connection, detachability and high installation efficiency.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.

Claims

1. A branch box on a column is characterized by comprising a box body, a first bus bar (102), a second bus bar (103) and an insulating plate (105);

the box body is of a cuboid structure, and cabinet doors are arranged on the front side and the back side of the box body; the bottom of the box body is provided with a plurality of through holes for the four-core aluminum cables to enter the box body or the service lines to be led out of the box body;

the insulating plate (105) is vertically fixed in the box body, and four arc-shaped notches (104) are formed in the top of the insulating plate (105); three first bus bars (102) and one second bus bar (103) are fixed on the insulating plate (105); the three first bus bars (102) respectively correspond to A, B, C three phases of the main lead; the second bus bar (103) corresponds to a zero line, a plurality of terminals are respectively arranged on the three first bus bars (102), a plurality of terminals with corresponding quantity are arranged on the second bus bar (103), and the service lines are connected to the first bus bars (102) and the second bus bars (103) and are led out through the wire outlet holes in the through holes below the box body;

leading one four-core aluminum cable from a main conductor, wherein the four-core aluminum cable is connected with the main conductor (300) by an Anpu wire clamp, the other end of the four-core aluminum cable is connected into a branch box through a wire inlet hole in the through hole below the box body, and core wires of the four-core aluminum cable are respectively and electrically connected with a corresponding first bus bar (102) or a corresponding second bus bar (103);

the three first bus bars (102) and the second bus bar (103) are respectively provided with a bus fixing end which is arranged in a staggered manner and aligned with the four arc-shaped notches (104);

the first busbar row (102) is convex, the busbar fixing end is positioned at the top, and the four wiring terminals are positioned at the lower part; the second bus bar row (103) is linear, and all the terminals and the bus fixing ends are positioned in one row; all the terminals are square mounting holes (30) arranged on the first bus bar (102) and the second bus bar (103);

the service wire (100) is fixed on the first bus bar (102) or the second bus bar (103) through a wire pressing screw;

the wire pressing screw comprises a screw (1) and a nut (4); the screw (1) comprises a square head (11) and a threaded rod (12), and a circular wire guide hole (6) is formed in the middle of the square head (11) and used for placing a wire of a user wire; the threaded rod (12) is connected to the side wall of the square head (11);

the nut (4) is used for being matched with the threaded rod (12) to fix the lead and the terminal;

gaps between two sides of the square head (11) parallel to the extending direction of the lead and the square mounting hole (30) are A, and gaps between two sides of the square head (11) perpendicular to the extending direction of the lead and the square mounting hole (30) are B; a is less than B; a gasket (5) is arranged between the nut (4) and the wiring end (3), and the gasket (5) is sleeved on the threaded rod (12); the middle of the gasket (5) is provided with a square hole, the size of the square hole is larger than that of the square head of the screw, and the square head can penetrate through the square hole.

2. A branch box on a column as claimed in claim 1, characterized in that the threaded rod (12) extends in a direction perpendicular to the direction of extension of the circular wire guide (6).

3. A branch box on a column according to claim 1, characterized in that the inner wall of the circular wire guide (6) is threaded.

4. A branch box on a column according to claim 1, characterized in that in the mounted state, the wire is passed through a circular wire guide hole (110), and a square head (11) of the screw (1) is inserted into a square mounting hole (30) of the terminal (3); the nut (4) is screwed on the threaded rod (12) to fix the lead wire and the terminal (3).