KR20120010779A - Socket Joint Kit for Busduct - Google Patents

Abstract

PURPOSE: A booth duct socket connection structure is provided to minimize the number of bolts for assembling and a discontinuous point by inserting both bus-bars which are projected form end part of booth ducts into a connecting socket. CONSTITUTION: Both bus-bars(21A,21B) is composed of a connecting socket which is inserted into an internal space. The connecting socket is manufactured by casting or die-casting in order to be formed into a square shape. The internal space is formed by combining a top plate and a bottom plate. Bolt holes(211A,211B) for bolt conclusion and 4 through-holes are formed in the bus-bar. A stopper is formed in center of the bottom plate in order to prevent end parts of the bus-bar to be contacted. A protrusion part is formed in order to prevent the succession of the bus-bar.

Description

Booth duct socket connection structure {Socket Joint Kit for Busduct}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus duct for supplying a large amount of electric power by using a bus bar as a conductor, and more particularly, to a bus duct socket connecting structure having a proper surface pressure by minimizing discontinuities and spaces by connecting a bus bar using a connection socket. .

A bus duct is installed in a factory or a building to supply a large amount of electric power from an electrical room to a unit distribution area such as each floor of a building or a unit line of a factory.

Among these booth ducts, there is known an air-insulation type bus duct that performs insulation by surrounding air by spacing a plurality of neighboring bus bars passing therein.

An air insulation bus duct has a form in which a plurality of bus bars having a rectangular cross section pass therethrough. The busbar is made of a conductor such as aluminum (Al) or copper (Cu), and may consist of only three phase wires (R phase, S phase, and T phase), and there may be a neutral wire (N phase) or a ground wire (E phase). This may be further included.

In such a bus duct, a junction box mounted between two adjacent bus ducts has a bus bar 11A, 11B inserted into the left and right between the two bus ducts 10 as shown in FIG. 11B) is bound and connected.

Such a junction box is formed by sandwiching a plurality of connecting plates 13 in the form of a sandwich on the surfaces of the busbars 11A and 11B and fastening the bolts 15 to both sides of the connecting plate 13. The bolts 15 are fastened in four places, three on each of the connecting plates 13 padded on both surfaces of the busbars 11A and 11B. At this time, the busbars 11A and 11B are connected so that their end faces do not touch each other. And, in order to prevent breakdown at high pressure, the bolts 15 are made of M5 cap bolts 17 and diaphragm 19 which are capped with a PVC material and are mounted separately. Here, the M5 cap bolt 17 is a structure in which the M5 bolt with a cap of PVC material is fastened to the bolts 15 on each of the busbars 11A and 11B. The diaphragm 19 is formed by partitioning the interior to form a plurality of independent spaces, and busbars 11A and 11B are disposed one by one in each partitioned independent space to maintain a state of forming an independent insulation space.

However, in such a booth duct connection structure that is fastened by bolts, the electric field is concentrated on the part due to the protrusion of the fastening bolts, the critical voltage is lowered, the electric field structure becomes uneven, and the breakdown between phases can easily occur. The problem of partial discharge occurs. In addition, as the overall volume of the junction box has a disadvantage that the material cost, assembly cost and time are consumed relatively large. In addition, there is an unreasonable point that the size of the busbar or the enclosure is increased to satisfy the regulations on the limit of temperature rise due to the increase in the amount of heat generated when the busbar is energized.

Accordingly, an object of the present invention is to solve the above-mentioned problems to eliminate the connection structure of the connection plate and the use of bolts and to plug both busbars into the socket connection structure to minimize the discontinuity and space when assembling It is to provide a bus duct socket connection structure to maintain the strength of the bolts with a minimum number of bolts.

In the booth duct socket connection structure of the present invention for achieving the above object, in the air insulation bus duct connection structure, busbars protruding from both booth ducts are inserted into an inner space formed by combining an upper plate and a lower plate. It is composed of a connection socket to be built, the connection socket is provided with a plurality of through holes for fastening the bolts at positions corresponding to each other of the upper plate and the lower plate, a stopper is provided in the middle of the lower plate so that the ends of the busbars do not touch each other. Protruding portion is provided to prevent the departure of the busbar on both sides.

In the bus duct socket connection structure of the present invention, both bus bars protruding from the ends of the adjacent bus ducts are closely attached to the connection sockets, thereby minimizing discontinuities and the number of bolts during assembly, and minimizing the temperature rise during energization of the bus bars. Cost reduction can be achieved, thereby minimizing the size of busbars and compacting the size of the junction box.

1 is a view showing a conventional booth duct connection structure,
2 is a view showing a bus duct socket connection structure according to the present invention;
3a-3b is a detailed view showing the connection socket structure of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 to 3b show a bus duct connection structure according to the present invention.

As shown in Fig. 2, the booth duct connection structure of the present invention comprises a socket connection structure in which both busbars 21A and 21B are fitted to both sides of the connection socket 23 made of aluminum.

3A and 3B, the bus bars 21A and 21B are provided with bolt holes 211A and 211B for fastening bolts and four through holes 213A and 213B, two in a row, respectively.

The connection socket 23 is manufactured by casting or die casting to have a rectangular shape, and the upper plate 231 and the lower plate 233 are configured to be combined, but are formed by combining the upper plate 231 and the lower plate 233. The busbars 21A and 21B are connected to the internal space.

As shown in FIG. 3A, the upper plate 231 and the lower plate 233 are provided with holes for fastening bolts at three positions corresponding to each other, and in addition, the lower plate 233 is provided with a stopper 235 at the center thereof. The stopper 235 serves to prevent both ends of the busbars 21A and 21B fitted between the upper plate 231 and the lower plate 233 of the connection socket 23 from touching each other. Sides of the stopper 235 are provided with protrusions 237 protruding from the four protrusions two by two. The protrusion 237 serves to prevent the departure of the bus bars 21A and 21B by fitting the through holes 213A and 213B of the bus bars 21A and 21B to the protruding protrusions.

Then, the bolt 239 is inserted into three through holes provided in the lower plate 233 of the connection socket 23 to be fastened. Here, since the connection socket 23 is assembled by the external bolt 239, an appropriate surface pressure is given to minimize discontinuities and spaces. The protrusion 237 provided on the lower plate 233 of the connection socket 23 is made of aluminum like the connection socket 23, and is integrally formed with the connection socket 23.

In the conventional bolt cap-connection plate structure, the bolt protrudes from the connection surface, so that the insulation breakdown occurs easily between the phases. In the socket connection structure of the present invention, the connection bolt enters the connection socket, thereby preventing the insulation breakdown in advance. No bolt cap is required.

On the construction side, the existing connection plate-bolt structure requires a large number of bolted joints to secure the connection strength, but the connection socket structure of the present invention can maintain the strength with only minimal coupling.

21A, 21B: Busbar 23: Connection socket
231: top plate 233: bottom plate
235 stopper 237 protrusion
239: Fastening bolt

Claims (5)

In the air insulation bus duct connection structure,
The bus bar protruding from both bus ducts is composed of a connection socket adapted to fit into an inner space formed by combining the upper and lower plates.
The connection socket
A plurality of through holes are provided for fastening the bolts at positions corresponding to each other of the upper plate and the lower plate, and a stopper is provided in the middle of the lower plate so that the end portions of the bus bars do not touch each other, and protrusions are provided to prevent detachment of the bus bars on both sides thereof. Booth duct socket connection structure characterized in that provided. The bus duct socket connection structure according to claim 1, wherein the connection socket is made of the same material as the bus bar. 3. The bus duct socket connection structure according to claim 2, wherein the connection socket is made of a casting or die casting and is made of aluminum. The bus duct socket connection structure according to claim 1, wherein the bus bar is provided with a through hole to be connected to the protrusion. 4. The bus duct socket connection structure according to claim 3, wherein the protrusion is integral with the bottom plate of the connection socket.

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