JPS6342841B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of assembling stationary induction electric appliances such as transformers, reactors, etc., and particularly to a method of connecting electric appliance windings using connection leads in a split type transformer.

In recent years, transformers have become larger as the voltage and capacity have increased, and due to railway transportation restrictions, it has become increasingly common for transformers to be divided into multiple pieces and connected and assembled on-site. By the way, in such a split type transformer, if you want to connect each electrical winding or between the winding and the lower terminal of the bushing using connection leads with multiple insulation barriers, connect as shown in Figure 1. It is expected that this structure will become a structure.

FIG. 1 shows an example of application to a two-part transformer, which consists of two transformers 1A and 1B arranged in parallel. Each of these transformers 1A, 1B is constructed by storing the contents of the transformer consisting of an iron core 3 and a winding 4 in a tank 2, and there is an expansion joint between the tanks 2 of each of these transformers 1A, 1B. 5
A, connection duct (not shown), butting pocket 6 (consisting of an upper part 6a and a lower part 6b which are detachably connected), connection duct (not shown)
and a removable duct consisting of an expansion joint 5B. A lead wire 7 is drawn out from the winding 4 of each transformer 1A, 1B, and connects the current-carrying center conductor 9 of the connection lead 8A, 8B to the connection terminal 1.
0, and the current-carrying center conductor 9 is connected to
It is connected to the lower terminal 12 of the bushing 11 attached to the bushing pocket 6. The current-carrying central conductor 9 is formed of a flexible draw lead, which can absorb thermal expansion and can be pulled out during work. Multiple insulating barriers 14 are each provided. Expansion joints 5A and 8B of connection leads 8A and 8B with multiple insulation barriers constituted by these parts 9, 13 and 14, respectively.
5B, an insulating barrier 16 and a grounding outer circumferential electrode 17 for mitigating electric field are sequentially provided via a spacer 15, and this grounding outer circumferential electrode 17 is connected to a support member (not shown) from the tank 2 or the bushing pocket 6. is supported through.
Further, a bushing shield 18 for mitigating an electric field is provided so as to surround the connecting portion between the current-carrying center conductor 9 and the lower terminal 12 of the bushing 11, and the outside of this shield 18 is covered with an insulating barrier 19.

When transporting a split transformer with such a connection structure, each transformer 1A, 1B
The expansion joints 5A, 5B and the lower part 6b of the bushing pocket 6 containing the connection leads 8A, 8B, etc., and the upper part 6a of the bushing pocket 6 with the bushing 11 attached are separated and transported separately. For this purpose, connection between the lead wire 7 from the winding 4 and the current-carrying center conductor 9 of the connection leads 8A, 8B, and the connection between the current-carrying center conductor 9
and the lower terminal 12 of the bushing 11, respectively, must be disconnected. However, on the outside of these connections to be separated, that is, the connection between the lead wire 7 and the center conductor 9, there are hollow pipes 13, multiple insulation barriers 14, spacers 15, and insulation barriers 1.
6 and a grounding peripheral electrode 17, and there is an insulating barrier 19 on the outside of the connection between the center conductor 9 and the lower terminal 12, so these must be disassembled one by one and reassembled on site before transportation. First, the work requires a long time, and the time required for the insulator to absorb moisture at the site becomes longer, which may reduce reliability.

The present invention has been made in view of this point, and its purpose is to connect each electrical winding with a connection lead with multiple insulation barriers, but with a split structure that allows easy assembly of the connection leads and bushings. An object of the present invention is to provide a method for assembling a stationary induction appliance.

In order to achieve this object, the present invention has a structure in which connection leads with multiple insulating barriers that connect electrical windings can be detachably connected near the joint between the tank and the duct and near the joint between the bushing. Then, each stationary induction electric device that stores the tank side connection lead in the tank, the duct that stores each duct side connection lead divided at the connection with the bushing, and the bushing are transported to the installation site separately. , First, install each stationary induction electric appliance in a predetermined position,
After inserting the duct between the tanks of these stationary induction appliances, move each duct-side connection lead in the duct to the tank side, make one end protrude outside the duct, connect it to the tank-side connection lead, and connect it to the tank side connection lead. It is characterized in that both ends are connected to the tank, and then the current-carrying conductor of each duct side connection lead and the bushing are connected.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. In these figures, the same reference numerals as in FIG. 1 indicate the same or equivalent parts.

In this example, the structure of the connection lead with multiple insulation barriers and the structure of the connection part between the current-carrying center conductor of this connection lead and the lower terminal of the bushing are manufactured as shown in Figures 2 to 4. .

That is, the connection lead 20 with multiple insulation barriers
A, 20B, the hollow pipe 13 and the multiple insulation barrier 14 are divided near the removable joint between the tank 2 and the expansion joints 5A, 5B, and the lead wire 7 of the electrical winding 4 is connected to this joint. A tube contact 22 is pulled out to the vicinity, and a tulip contact 22 is fixed to the end thereof via a connecting terminal 21, and is removably fitted and connected to a connecting terminal 23 fixed to one end of the current-carrying center conductor 9. ing. In addition,
The connecting terminals 21 and 23 are each fixed to the hollow pipe 13 by mounting bolts 24, and each insulating barrier at the end of the divided multiple insulating barrier 14 is connected to the end of another divided multiple insulating barrier 14. The insulation barriers alternately overlap each other in order to increase the insulation creepage distance at this connection.

On the other hand, at the connection portion between the current-carrying center conductor 9 of the connection leads 20A, 20B and the lower terminal 12 of the bushing 11, connection terminals 25, 26 are fixed to the other end of each current-carrying center conductor 9, respectively. The connecting terminals 25 and 26 are coupled and connected by a connecting terminal 28 having a tulip contact 27, and the lower terminal 12 of the bushing 11 is removably fitted into and connected to the tulip contact 27. It is becoming. In addition, the insulation barrier 1
A flange insulating collar 29 is inserted between 4 and 19.

Then, during transportation, the insulation barrier 19 is removed (the insulation barrier 19 is split into two parts, so it is very easy to remove it), and each tank 2 and expansion joint 5A, each of which has a removable structure, are removed. , 5B, connection portion of each connection lead 20A, 20B with multiple insulation barrier, connection lead 20
A, 20B current-carrying center conductor 9 and bushing 11
connection part with the lower terminal 12, each connection lead 20
The connection between the current-carrying center conductor 9 of A and 20B, and the upper part 6a and lower part 6 of the bushing pocket 6
Each of the transformers 1A, 1 with a part of the divided connection leads 20A, 20B (tank side connection leads 20A _t , 20B _t ) is separated by cutting off the joints of b.
B and other parts of the divided connection leads 20A, 20B (duct side connection leads 20A _d , 20B _d )
The expansion joints 5A, 5B, which are equipped with the same components as shown in FIG. At this time, as shown in Fig. 5, each transformer 1A, 1
The opening caused by separating the tank 2 in B is covered with a transportation cover 30, and the duct side connection leads 20A _d ,
In the expansion joints 5A, 5B equipped with 20B _d , etc. and the lower part 6b of the bushing pocket 6, connect each duct side connection lead 20A _d , 20B _d , etc. to the center side,
In other words, the bushing 11 and the connection terminal 28 are removed to move to the space formed, and the ends of the duct side connection leads 20A _d and 20B _d are positioned within the expansion joints 5A and 5B, and then separated. The opening is covered with transportation covers 31 and 32.

Each part transported to the site in this way is first connected to the tank side connection lead 2
After the transformers 1A and 1B equipped with A _t and 20B _t are installed side by side at predetermined positions, the transportation cover 30 is removed and the duct side connection leads 20A _d and 20B are connected between the transformers 1A and 1B. 20B _d , etc. and the lower portion 6a of the bushing pocket 6 are inserted in the direction of the arrow. Note that, prior to this insertion, the transportation covers 31 and 32 are removed in advance. Next, the duct side connection lead 20A _d ,
Move 20B _d to the tank side, make its ends protrude outside the expansion joints 5A and 5B and connect them to the tank side connection leads, and connect the expansion joints 5A and 5B to the tank 2 of each transformer 1A and 1B. . after that,
A connecting terminal 28 equipped with a tube contact 27 is inserted between the connecting terminals 25 and 26 of each duct side connecting reet 20A _d and 20B _d , and is fixed with a mounting bolt 24 to connect these, and further this connection The portion is covered with an insulating barrier 19. Finally, connect the lower terminal 12 of the bushing 11 to the tube contact 2.
7 and connect these, and the upper part 6a and lower part 6b of the bushing pocket 6 are assembled as shown in FIG.

Therefore, according to this embodiment, the connection leads 20A and 20B with multiple insulation barriers can be divided into parts and transported without being dismantled, and the connections between the parts that have been transported in parts are extremely easy. Therefore, on-site assembly work is facilitated, the assembly work time is shortened, and the moisture absorption time of the insulator can be reduced.

In the above-mentioned embodiment, a case where the present invention is applied to a two-part transformer has been described, but the present invention is not limited to this, but can be widely applied to transformers divided into a larger number of parts. Further, the tulip contact 22 may be fixed to the connecting terminal 23 side, and the tulip contact 27 may be fixed to the lower terminal 12 side of the bushing 11.

As explained above, according to the assembly method of the present invention, it is possible to extremely easily assemble a split-type stationary induction electric appliance in which each electric appliance winding is connected using connection leads with multiple insulation barriers, and the assembly work time can be reduced. It can reduce the moisture absorption time of insulation and improve its quality and reliability.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view of a split-type transformer in which electrical windings are connected by connection leads with multiple insulation barriers, and FIG. 2 is a split-type transformer assembled by an assembly method according to an embodiment of the present invention. 3 and 4 are enlarged views of the vicinity of the connection between the tank and the expansion joint and the connection between the connection lead and the bushing in the transformer shown in Figure 2. FIG. 3 is a cross-sectional plan view showing a state in the middle of an assembly method according to an embodiment of the invention. 1A, 1B...Transformer, 2...Tank, 4...
Winding, 5A, 5B...Expansion joint, 6...Butching pocket, 7...Lead wire, 9...Central conductor for current carrying, 11...Butching, 14...Multiple insulation barrier, 18...Electric field relaxation Bushing shield for 2
0A, 20B... Connection lead with multiple insulation barrier,
20A _t , 20B _t ...Tank side connection lead, 20
A _d , 20B _d ...Duct side connection lead, 21, 2
3, 25, 26, 28... Connection terminal, 22, 27
...Tulip contact.

Claims (1)

[Scope of Claims] 1 A plurality of stationary induction electric appliances each having an electric appliance winding housed in a tank are placed side by side, and the tanks are removably connected by a duct having a bushing pocket in the middle, and each of the electric appliances is The windings are connected by a connecting lead consisting of a current-carrying conductor and a multiple insulating barrier passing through the duct and removably connected near the removable coupling portion, the current-carrying conductor being located within the bushing pocket. In the method of assembling a stationary induction appliance in which a part of the stationary induction appliance is surrounded by an electric field mitigation shield and the current-carrying conductor and the bushing are connected within the electric field mitigation shield, first, a plurality of stationary induction appliances are installed at a predetermined position, and these stationary induction appliances are After inserting the duct that accommodates the duct-side connection leads divided at the connection part with the bushing between the tanks of the induction electric appliance, move each divided duct-side connection lead in the duct to the tank side. One end is made to protrude outside the duct and connected to the tank-side connection lead, and both ends of the duct are connected to the tank.Then, the current-carrying conductor and the bushing at the other end of each duct-side connection lead are then removably connected. Characteristic method of assembling stationary induction appliances. 2. Claim 1 is characterized in that after the current-carrying conductors at the other end of each duct-side connection lead are connected by a connection terminal, a bushing is connected to this connection terminal via a tulip contact. How to assemble stationary induction appliances.