JPS5838046B2 - How to connect an insulated bus duct - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulator having a structure in which a plurality of insulated conductors, each made of a band-shaped conductor made of aluminum or copper, coated with an insulating coating, are housed and held in close contact with each other in a metal casing made of aluminum or the like. This relates to a bus duct connection method.

When connecting an insulated bus duct with the above configuration,
When connecting the corresponding insulated conductors of each phase by welding, the insulated conductors of the adjacent phases are in close contact with each other, so that the corresponding insulated conductors of each phase can be connected without damaging the insulation coating due to the heat during welding. Welding them together and insulating the connections requires quite tedious work.

Conventionally, therefore, the exposed ends of the insulated conductors of the corresponding phases of the insulated bus ducts arranged facing each other to be connected are overlapped, and the exposed ends of the conductors of different phases and between these and the connection case are A hard insulating plate is interposed, and an insulating tube is placed through the overlapped exposed ends of the insulated conductors of each phase and the insulating plate, and a bolt is inserted into this insulating tube from the outside of the connection casing. A method is adopted in which the overlapping exposed ends of the insulated conductors of each phase, the insulating plate, and the connection casing are collectively tightened using nuts and washers.

However, in this connection method, a large number of conductors and insulating plates are tightened together with bolts, so the bolt tightening force decreases due to thermal effects during energization and other reasons, and as a result, the exposed conductor ends Not only is there a risk of an overheating accident occurring at the overlapping joint, but there is also a risk of a connection failure due to thermal stress.Therefore, the tightening torque and connection condition of the bolts must be periodically inspected, making maintenance management difficult. It is troublesome, and since the ends of each conductor are connected by pressure welding by surface contact, it is necessary to plate the connection surface of the conductor with silver, tin, etc. In addition, the connection structure and work are complicated, such as interposing insulating plates between conductors of different phases, and using high-strength steel bolts, heat-resistant insulating tubes, and washers made of special materials and shapes for tightening. It has various drawbacks such as being complicated and expensive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for connecting insulated bus ducts that advantageously solves the aforementioned problems.

An embodiment of the method of the present invention will be described below with reference to FIG.

Insulated bus ducts 1a and 1b in FIG. 1 are arranged facing each other in series for connection, and each of these insulated bus ducts Ha and 1b have strip conductors 2a and 2b made of aluminum, copper, etc.
Insulating coating 5a on 3a, 4a and 2b, 3b, 4b
,6a,? Insulated conductors 8at9a, 10a and 8b, 9b, 1 formed by applying a and 5b, 6b, 7b
0b are housed and held in casings 11a and llb in close contact with each other, respectively.

Each of these insulated conductors 8 a t9a, 10a, 8b, 9b
, 10b protrude by a predetermined length from the end of each housing 11a, 1lb, and the corresponding insulated conductors 8a, 8b to be welded in the first order are connected to the exposed conductors. The tips of 2a and 2b are brought into contact with each other.

Also, the insulated conductors 9a and 9b corresponding to each other to be welded and connected in the second order, that is, the insulated conductor 9 located in the center
The vicinity of each connection end of the insulated conductors 8a and 8b is bent in a direction perpendicular to the length direction of the entire bus duct so that a predetermined distance h1 is maintained between the insulated conductors 8a and 8b, and each exposed Insulated conductors 10 are arranged facing each other so that a predetermined gap g1 exists between the tip ends of the conductors 3a and 3b, and are further welded and connected in the third order.
Insulated conductors 9a, 9 in the direction orthogonal to the length direction of the entire bus duct near the connection ends of conductors 9a, 10b.
The conductors 4a and 4b are bent so that a predetermined distance h2 is maintained between them, and the exposed conductors 4a and 4b are arranged to face each other so that a gap g2 larger than the gap g1 exists between the tips of the exposed conductors 4a and 4b. .

After completing the above preparation steps, both conductors 2a and 2 of the insulated conductors 8a and 8b of the phase to be connected first
The tips of b are welded and connected to each other by TIG or MIG arc welding in an inert gas atmosphere.

In this case, the remaining insulated conductors 9a, 9b and 10a, 10b of the other two phases are spaced at predetermined intervals h1 and h1+, respectively, with respect to the insulated conductors 8a and 8b of the phase related to the welding work.
h2 and their conductors 3 a t3b
and a predetermined gap g between the tips of 4a and 4b.
1 and g2, the gaps g1, g
2 through insulated conductors 8a, 8b, conductors 2a, 2
The welding operation b can be easily performed, and the presence of the gaps h1 and h1+h2 prevents the insulation coatings 6at5b, 7a, and 7b of the other insulated conductors 9a, 9b, 10a, and 10b from being damaged by the heat during welding. It will never happen.

In this way, the insulated conductor 8a of the phase to be connected first
, 8b, the insulated conductors 9a, 9 of the second phase to be connected are completed.
A crossover conductor 12 is spanned across both conductors 3a and 3b at b, and the crossover conductor 12 and the ends of each conductor 3a and 3b are welded and connected to each other by the same welding method as described above.

In this case as well, the welding work can be easily performed and the other insulated conductor 8at.
8bt 10a, 10b insulation coating 5 a t 5 b
There is no fear that p7at1b will be damaged by the heat during welding.

And finally, the insulated conductor 10 of the third phase to be connected
A crossover conductor 13 is spanned between both conductors 4a and 4b in a and 10b, and each conductor 4a, 4b and the end of the crossover conductor 13 are welded and connected by the same welding method as described above.

In this case, since the insulated conductors iQa, 10b are located on the outside, it is possible to easily weld them, and as in the case of the insulated conductors 8a, 8b and 9a, 9b, the other insulated conductors 8a, 10b can be welded easily. = 8b, 9a, 9
There is also no risk of thermal damage to the insulating coatings 5a, 5b=6a-6b of b.

In addition, each phase conductor 2 a t2 connected as described above
In order to ensure insulation of exposed conductor parts such as b, 3a, 3b, 4a, 4b and each crossover conductor 12.13, these are coated with the insulating coating 5a, 5b, 6a, 6.
Insulating coating may be performed using a tape or sheet made of the same material as b, 7a, and 7b.

Then, insulated conductors 8a and 8b, 9a and gb, iQa, and 10 of the corresponding phases are connected as described above.
After welding and connecting the connectors 11a and 11b, a connection housing 14 that encloses and accommodates the entire connection portion is interposed and fixed between the housings 11a and 1Ib, thereby completing the entire connection work.

Therefore, as is clear from the procedure and the shape of the connected part after the connection is completed, the connection method of the above embodiment performs the welding work either above or below the insulated bus ducts tla, lb, or to the left or right. Therefore, the connection method of the above embodiment is suitable for welding work, such as when the insulated bus ducts Ha, lb are installed along the ceiling or wall, etc. This can be implemented as particularly effective when the spatial space of is limited to a specific direction.

On the other hand, the present invention is not limited to the method of the above-mentioned embodiment, and when there is a space where it is advantageous to perform welding work on both sides of the insulated bus duct, it may be carried out as shown in FIG. You may.

That is, the insulated conductors 9a and 9b located in the center
The two conductors 3at3b whose tips are exposed are butted against each other in a straight state, and this is made the first welding order, and the insulated conductors 8a and 8b located on both sides are
and the insulated conductor 9 near each connection end of 10a, 10b in a direction perpendicular to the length direction of the entire bus duct.
a and t9b so that a predetermined interval h1 is maintained between each exposed conductor 2'at2
The insulated conductors 8at8b and 10a, 10b of each insulated conductor 8at8b and each conductor 2a of 10a, 10b are arranged facing each other so that a predetermined interval g1 exists between the tip ends of the insulated conductors 8at8b and 10a, 10b.
, 2b, and 4a, 4b may be welded and connected via the crossing conductor 12 in the second order.

In addition, in the above embodiment, three (phase) insulated conductors 8a, 8b,
Although this is an example of connecting insulated bus ducts Ha and 1b that accommodate and hold conductors 9a, 9b, 10a, and 10b, respectively, the present invention is not limited to the above embodiment. It can also be applied when connecting insulated bus ducts with

In this case, the interval provided between the ends of the insulated conductor to be welded in the later order may be set to be sequentially wider than that of the insulated conductor to be welded in the earlier order.

As explained above, according to the method of the present invention, when the exposed conductors of the insulated conductors of the corresponding phases in the insulated bus ducts arranged facing each other to be connected are sequentially welded and connected to each other at a time difference, each An appropriate distance h is maintained between the insulated conductors of the phases in the direction orthogonal to the longitudinal direction of the entire bus duct, and between the tips of the conductors facing each other of the phases that are to be welded later, the tips of the conductors of the phases that are to be welded first are After that, the exposed conductor ends of the corresponding insulated conductors of each phase are welded together directly or via a crossover conductor in sequence according to the predetermined welding order. Since the welding connection is made to the ends of each phase conductor, the insulation coating of other adjacent insulated conductors will not be damaged by the heat during welding, and the other insulated conductors will not interfere with the welding work. Mutual welding connection work can be carried out extremely easily and smoothly. Therefore, according to the present invention, it is possible to easily perform welding connection of conductors in an insulated bus duct, which was conventionally impossible or had to be done with considerable difficulty. be able to.

Further, in this invention, since the corresponding phase conductors are connected by welding, it is possible to omit and eliminate the work of performing detailed plating on the end face of each phase conductor, and it is possible to mechanically and electrically connect each phase conductor. can be connected reliably,
Therefore, there is no fear of heat generation or voltage drop at the connection due to an increase in electrical resistance, and a good connection can be maintained for a long period of time, making maintenance and inspection of the connection easier, etc. is obtained.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted side view showing an example of a connecting section constructed by applying the connection method according to the present invention, and FIG. 2 is a partially omitted side view showing another example. 1a, 1b...Insulated bus duct, 2a, 2b, 3a
, 3b, 4a, 4b...Conductor, 8a*8b
t9a, 9b, 10a, 10b... Insulated conductor, 12, 13... Transition conductor, h1, h2...
Spacing between insulated conductors of different phases, gl j g2...Gap between the ends of conductors to be connected to each other.

Claims (1)

[Claims] 1. When sequentially welding and connecting the exposed conductors of the insulated conductors of each phase corresponding to each other in the insulated bus ducts arranged oppositely to be connected for each phase in accordance with the determined welding order, each An appropriate interval is maintained between the phase insulated conductors in the direction orthogonal to the longitudinal direction of the entire bus duct, and a welding order is maintained between mutually opposing conductor ends of the phase whose welding order is later in time. A gap larger than the gap provided between the mutually opposing conductor ends of the preceding phase is maintained, and then the mutually opposing conductor ends of the phase with the first welding order are welded and connected. A method for connecting an insulated bus duct, comprising sequentially welding and connecting mutually opposing conductor ends of phases having a second or subsequent welding order via a crossover conductor, starting from a priority phase of a welding order.