JPS6342842B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection device for stationary induction electric appliances such as transformers, reactors, etc., and particularly to a connection device using connecting leads between each electric appliance winding in a split type transformer.

Recently, transformers have become larger due to higher voltage and larger capacity, and due to railway transportation restrictions, it has become more 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, the connection as shown in Figure 1 is required. It is expected that the structure will be

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 and 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 and 1B. 5
A, connection duct (not shown), butting pocket 6 (consisting of an upper part 6a and a lower part 6b that 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.
An insulating barrier 16 and a grounding outer circumferential electrode 17 for mitigating electric field are further provided in this order on the outer periphery of the portion corresponding to 5B via a spacer 15. 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 an object of the present invention is to make it easy to disconnect, assemble, and transport the connection leads, even though each electrical winding is connected using connection leads with multiple insulation barriers. An object of the present invention is to provide a connection device for a split type stationary induction electric appliance.

To achieve this objective, the present invention provides a method for connecting the current-carrying conductor and the multiple insulating barrier of the connection lead with multiple insulating barriers between the electrical windings in the vicinity of the removable joint of each electrical appliance tank and the duct connecting them. At least one of the divided current-carrying conductors can be drawn out, at least one of the divided multiple insulating barriers can be moved in the longitudinal direction, and each of the divided ends can be connected to each other. It is characterized by being detachably connected to.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In these figures, the same reference numerals as in FIG. 1 indicate the same or equivalent parts.

This embodiment differs from the connection device shown in FIG.
These are the structure of a connection lead with multiple insulation barriers, and the structure of the connecting portion between the current-carrying center conductor of this connection lead and the lower terminal of the bushing.

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 joints between the tank 2 and the expansion joints 5A, 5B, and the divided tank side connection leads 20A _t ,
The 20 B _t multiple insulation barrier 14 is movable in its longitudinal direction, and the lead wire 7 of the electric appliance winding 4 is pulled out to the vicinity of this joint, and the connecting terminal 21 is fixed to the end thereof, so that it is energized. It has a structure in which it is removably fitted and connected to a tube contact 22 fixed to one end of the center conductor 9 via a connecting terminal 23. Note that the connection terminal 23 is fixed to the hollow pipe 13 with a mounting bolt 24,
And each insulating barrier at the end of the divided multiple insulating barrier 14 overlaps each insulating barrier at the end of the other divided multiple insulating barrier 14 so that the insulation creepage distance at this connection is increased. It's getting old.

On the other hand, the connecting portion between the current-carrying center conductor 9 of the connection leads 20A, 20B and the lower terminal 12 of the bushing 11 is connected to a connection terminal 26 (attached to The lower terminal 12 of the bushing 11 is removably fitted into the tube contact 25. Further, a flanged insulating collar 27 is inserted between the insulating barriers 14 and 19.

Therefore, during transportation, the connecting parts between each tank 2 and the expansion joints 5A, 5B, and the connection leads 20A, 20 with multiple insulating barriers are structured so that they can be attached and detached without dismantling the insulating barriers etc.
The connection portion between the current-carrying center conductor 9 of the connection leads 20A and 20B and the lower terminal 12 of the bushing 11, and the upper portion 6 of the bushing pocket 6.
A and the lower part 6b are easily separated from each other, and the transformers 1A and 1B each have a portion of the divided connection leads 20A and 20B (tank side connection leads 20A _t and 20B _t ), and the divided connection lead 2
Other parts of 0A, 20B (duct side connection lead 2
Expansion joints 5A, 5B with 0A _d , 20B _d ), etc.
The lower part 6b of the bushing pocket 6 and the bushing 11 attached to the upper part 6a of the bushing pocket 6 can be separated and transported separately. At this time, in each of the transformers 1A and 1B, the insulation barrier 14 and the lead wire 9 of the tank side connection leads 20A _t and 20B _t are moved to the winding side, so that these ends are as shown in FIG. _After positioning it in the tank ₂ as shown in FIG. Each opening created by the separation is covered with a transport cover.

For each part transported to the site, first install each transformer 1A, 1B equipped with tank side connection leads 20A _t , 20B _t in a predetermined position, then remove the transportation cover and connect these transformers 1A. , 1B, and the expansion joints 5A, 5B provided with duct side connection leads 20A _d , 20B _d, etc. and the lower portion 6b of the bushing pocket 6 are inserted. Note that, prior to this insertion, each transport cover is removed in advance. Next, pull out the lead wire 7 and connect the connecting terminal 2 at the end.
1 into the tube contact 22, and connect the tank side connection leads 20A _t and 20B _t .
Move the insulating barrier 14 to the expansion joints 5A, 5B side, make the ends protrude, and connect the duct side connection lead 2.
0A _d , 20B _d are fitted and connected to the insulating barrier 14,
Furthermore, expansion joints 5A and 5B are connected to each transformer 1A and 1B.
is connected to tank 2. After that, Bushing 11
Insert and connect the lower terminal 12 of the bushing to the tube contact 25, and connect the upper part 6a of the bushing pocket 6.
By joining the lower part 6b to the lower part 6b, it can be easily assembled as shown in FIG.

In the above embodiment, a case has been described in which the case is applied to a two-split type transformer in which each electric appliance winding and the bushing are connected by connection leads, but the present invention is not limited to this, and can be applied to a larger number of devices. It can also be widely applied to divided transformers and those in which windings of electric appliances are directly connected by connecting leads as shown in FIG.

Further, the tulip contact 22 may be fixed to the connection terminal 21 side, the tulip contact 25 may be fixed to the lower terminal 12 side of the bushing 11, and the tulip contact 25 may be fixed to the duct side connection instead of the tank side connection leads 20A _t and 20B _t . The insulating barrier 14 can be configured such that the center conductor 9 of the leads 20A _d and 20B _d can be pulled out and the insulating barrier 14 can be moved in its longitudinal direction, or the center conductor 9 of each connection lead on the tank side and the duct side can be pulled out. It is also possible to make it movable in its longitudinal direction, and in these cases, the same effects as in the previous embodiment can be obtained.

As explained above, according to the present invention, even though a connection lead with a multiple insulation barrier is used as a connection lead for connecting each electric appliance winding, the disconnection, assembly work, and transportation of the connection lead are extremely easy. , the work time can be shortened, and
Along with this, it is also possible to reduce the moisture absorption time of the insulator and improve its reliability.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view showing a connection device expected when connecting electrical windings of a split type transformer using connection leads with multiple insulation barriers, and FIG. 2 is a split plan according to an embodiment of the present invention. FIG. 3 is a cross-sectional plan view showing a connection device for a type transformer, FIG. 3 is a cross-sectional plan view showing a state in which the connecting portion of the connection lead in FIG. FIG. 2 is a cross-sectional plan view showing a connecting device for a transformer. 1A, 1B...Transformer, 2...Tank, 4...
Winding wire, 5, 5A, 5B... expansion joint, 6... bushing pocket, 7... lead wire, 9... center conductor for current carrying, 11... bushing, 14... multiple insulation barrier, 18...... Bushing shield for electric field mitigation, 20, 20A, 20B... Connection lead with multiple insulation barrier, 20 _t , 20A _t , 20B _t ... Tank side connection lead, 20 _d , 20A _d , 20B _d ... Duct side connection lead , 21, 23, 26... Connection terminal, 22, 25... 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 arranged side by side, and the tanks are connected by a duct, and each of the electric appliance windings is passed between the electric appliance windings through the inside of the duct. and connected by a connection lead made of a current-carrying conductor provided with an insulating coating, wherein the insulating coating is composed of multiple insulation barriers, the duct is removably connected to the tank, and this connection The current-carrying conductor and the multiple insulating barrier of the connection lead are each divided near the section, and at least one of the divided multiple insulating barriers is extended in the longitudinal direction so that at least one of the divided current-carrying conductors can be drawn out. A connecting device for a stationary induction electric appliance, characterized in that it is movable and each of the divided ends is detachably connected. 2. The connection device for a stationary induction electric appliance according to claim 1, wherein the detachable connection portion of the current-carrying conductor is provided with a tube contact. 3. In either of claims 1 and 2, in the removable connection portions of the multiple insulating barrier, connection ends on the electric appliance winding side and connection ends on the duct side alternately overlap. A connecting device for a stationary induction electric appliance, characterized in that it is configured as follows. 4. In any one of claims 1 to 3, a bushing pocket is provided in the middle of the duct, and a part of the current-carrying conductor located in the bushing pocket is surrounded by an electric field mitigation shield, A connecting device for a stationary induction electric appliance, characterized in that the current-carrying conductor and the bushing are removably connected within the electric field mitigation shield.