JPS5957406A - Lead wire end device of transformer - Google Patents

Abstract

PURPOSE:To perform connection of lead wire end portion easily and rapidly without using a bushing for connection to other transformer, by a method wherein an end conductor with top end having recessed or protruded engaging portion is installed in a transformer tank. CONSTITUTION:A wire end device is provided in a pocket 104 of a transformer tank 101, and a dummy electrode 7 is combined to a wire end conductor 1 at normal state. The wire end conductor 1 is surrounded at circumference by an insulation barrier 5 thereby insulation structure is formed, and further an insulation coating 4 is applied thereto so as to reinforce the insulation strength. The wire end conductor 1 is to be connected to a wire end conductor of a wire end device provided in other transformer, and therefore the top end thereof may not be surrounded by an insulation barrier normally and fixedly but must be opened at connecting state. The dummy electrode 7 with an insulation barrier 10 is combined to the top end of the wire end conductor 1 for this reason. Therefore an engaging member 8 of the dummy electrode 7 is inserted to an engaging member 2 of the wire end conductor 1.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a transformer glue that is connected to a lead wire drawn out from a winding in a transformer and is used to connect to a lead wire of another transformer when adding a transformer. -Relating to a T-line terminal device.

[Technical disadvantages of the invention and its problems] Increase power transmission capacity at substations. In some cases, a new transformer is installed and this additional transformer is connected to the already installed transformer.

Conventionally, one of the methods for connecting an additional transformer E to an existing transformer is to provide a bushing at the connecting part of both transformers, and connect the lead wire drawn out from the winding of the existing transformer with a bushing. In some cases, the lead wires of an additional transformer are connected via bushings. Another method is to connect the tanks of both E transformers to each other with a duct, and to route both FE transformers inside the duct.

There is something to connect the wires.

However, the former requires expensive bushings at both transformer connections and the structure of the transformer tank would be complicated to accommodate the bushings, while the latter requires an inexpensive alternative to bushings. Submerged ducts can be used. However, in general, the end of the 9F wire in a transformer does not have a general-purpose or standard structure that allows it to be connected to anything, but rather the end of the lead wire in an additional transformer. The lead wire ends were modified to match the ends of the lead wires in the existing transformer.For this reason, work to modify the lead wire ends had to be carried out for a long time at the substation site, and moreover, there was a lot of trouble during the work. There are problems in that the contents of the transformer are often exposed to the atmosphere for a long time, moisture is absorbed into the If transformer contents, foreign matter is mixed in, etc., and the insulation reliability of the entire L-E transformer is reduced.

[Purpose of the invention]

An object of the present invention is to provide a lead wire terminal device for a transformer lfE transformer, which does not use a bushing to connect to another transformer and can easily connect the end of the lead wire in a short time. It is something to do.

[Summary of the invention]

The transformer lead wire terminal device of the present invention connects a terminal conductor having a concave or convex connection retaining portion at the tip and an insulating barrier around the terminal conductor to the lead wire of the transformer winding. A dummy electrode, which is installed inside the transformer tank and surrounded by an insulating barrier, is always engaged with the connection retaining part of the terminal conductor. When connecting another transformer, the dummy electrode is removed and the terminal The connecting and engaging portion of the conductor is connected and engaged with a convex or concave connecting and engaging portion of a terminal conductor provided on another IF transformer.

[Embodiments of the invention]

Embodiment 1) 11 of the present invention illustrated in the drawings will be described below.

FIG. 1 and FIG. 2 show an embodiment of the terminal device of the present invention. In the figure, 101 is a transformer tank filled with insulating oil, 102 is an iron core installed inside the transformer tank 10,
103 is a winding wound around the iron core 102. The terminal device of the present invention is provided inside the transformer tank 101, for example, inside a pocket 104 which is formed protrudingly from the side wall of the tank and is closed with a catch 105.

1 in the figure is a terminal conductor made of a conductive metal bar, and this terminal! Conductor 1 is transformer tank 1.01 Noah Nket 104
The internal VC is provided horizontally, and its base end is connected to the end of the REET 1 wire 106 drawn out from the winding 103.

At the center of the tip of the terminal/M body 1, there is formed a connecting engagement part 2 in the form of, for example, a concave hole, extending in the axial direction.
A ring-shaped connector 3 is provided on the inner wall of the connection engagement portion 2.
is the installation. ) An insulating coating 4 such as an insulating resin is formed on the entire outer surface of the terminal conductor 1 except for the opening of the connection retaining part 2. For example, two cylindrical insulating barriers 5 are arranged in the IM surrounding of the insulating coating 4 of the terminal conductor 1, concentrically with the terminal conductor 1 and separated into an inner and outer part 1. The terminal conductor IK is housed by being supported at the point. The tip of the insulating rear 5 is open. In the figure, 7 is a dummy electrode made of metal, and this dummy electrode 7 has the same diameter as the terminal conductor 1. At its base end, there is a rod corresponding to the hole-shaped connection engagement part 2 of the terminal conductor 1. The shaped retaining portion 8 is formed to overflow and protrude in the axial direction. Dummy electrode 7
The outer surface of the z:l! except for the engaging part 8 is insulated. Around the insulating liquid i4y of the dummy electrode 7, which is coated with an insulating liquid +v9 having the same thickness as i114, for example, two insulating barriers 10 in the shape of a cap with the region side open are placed on the insulating barrier 5. The insulating barriers 10 are arranged inside and outside at the same location i17, and these insulating barriers 10 are supported at a plurality of locations by spacers 1 and housed in the dummy electrodes 7. In addition, the dummy electrode 7
, the insulating coating 9 and the insulating barrier 10 have corners formed in arcuate shapes with appropriate curvature. The dummy electrode 7 is placed on the front side of the tip of the terminal conductor, and the engaging portion 8
is inserted into the connection and engagement portion 2 of the terminal conductor 1 into the unloading F'T function and engaged. In this case, the open part of the insulating barrier 5 of the terminal conductor 1 and the open part of the insulating barrier 10 of the dummy electrode 7 are joined to each other at a distance of qt, and the outermost inner part of the joined part is tied with the insulating thread 12. Tighten firmly. Note that the terminal conductor 1 is supported inside the pocket 104 of the transformer tank 101 by an insulating support.

The terminal device configured as above is provided in the lkerato 104 of the transformer tank 101, and the terminal conductor 1 and the dummy electrode 7 are normally combined.

Here, the terminal conductor 1 is surrounded by an insulating barrier 5 to form an insulating structure, and in addition to this, an insulating coating 4 is applied to increase the insulating strength. The terminal conductor 1 is to be connected to the terminal conductor of an immunization device provided in another transformer, and the tip cannot be permanently surrounded by an insulating barrier, but must be opened at the time of connection. Therefore, the insulation barrier 10
A dummy electrode 7 having a dummy electrode 7 is assembled to the tip of the terminal conductor 1. Therefore, the connection maintaining part 2 of the terminal conductor 1 is connected to the dummy electrode 7.
By inserting the engaging part 8, the intrusion of foreign substances such as dust from the outside can be prevented, and the insulating rear 10 can provide an insulating structure for the tip end side of the terminal conductor 1 from the outside. The insulation strength can be further increased by applying an insulation coating 9 in addition to this.

Note that the dummy electrode 7, the insulation coating 9, and the insulation barrier 10
Since the corners are formed in an arc shape, it is possible to alleviate the tension in the tunnel. In addition, since each insulating barrier 5.10 is provided in multiples and supported by spacing pieces 6.11, the transformer tank 10 is
The durability of the insulation barrier 5.10 against the insulating oil present inside the front kerato 104 of 1 can be increased, and the insulation strength can be improved. Therefore, by combining the dummy electrode 7 with the tip of the terminal conductor 1, insulation of the terminal conductor 1 during normal operation can be obtained.

A case will now be described in which another additional transformer is connected to the transformer equipped with the terminal device. The additional transformer is also provided with a terminal device inside the Ikerat 104 of the transformer tank 101, as shown in FIG. As shown in FIG. 3, this terminal device is basically the same as that shown in FIG. 2, and the connection and retention part of the terminal conductor 1 has a shape that should be combined with that shown in FIG. . In FIG. 3, the same parts as in FIG. 2 are designated by the same reference numerals. For example, a convex rod-shaped connection and retention part 13 is formed at the tip of the terminal conductor 1, and this can be detachably attached to the hole-shaped connection engagement part 2 of the terminal conductor 1 shown in FIG. It can be inserted. Dummy electrode 7
A hole-shaped retaining portion 14 that engages with the connection retaining portion 13 of the terminal conductor 1 is formed in the terminal conductor 1 . In this terminal device, a dummy electrode 7 is usually combined at the tip of the terminal conductor 1, similarly to the above-mentioned one.

When connecting an additional transformer to an existing transformer,
As shown in FIG. 4, in the terminal device provided in each transformer, the dummy electrode 7 is removed from the terminal conductor 1, and the tip of the terminal conductor 1 is opened.

Next, the rod-shaped connection and engagement part 13 of the terminal conductor 1 in the terminal bag of the expansion transformer is inserted into the hole-shaped connection and engagement part 2 of the terminal conductor 1 in the terminal device of the existing transformer. . Therefore, the connection engagement part 2 of the terminal conductor 1 in the existing transformer and the connection engagement part 13 of the terminal 4 in the expansion transformer EE 5 K are reciprocally engaged and connected. Each terminal conductor 1
An insulating barrier 5 surrounding the periphery connects the respective open end portions to each other. Furthermore, the lids 7os of the four sockets 104 in the tanks 101 of the existing transformer and the additional transformer are removed to open the pockets 104, and the connection duct 107 is inserted between the pockets 104 of both tanks 101.
・”μ is tied. By connecting the terminal device d of the existing transformer and the terminal device of the installed transformer in this way, the connection can be made easily and in a short time.

〔Effect of the invention〕

As explained above, the lead 9-wire terminal device of the transformer of the present invention does not require a bushing at the connection part in order to connect 14 transformer LF5 comrades, and the combination of the unevenness 13B at the connection engagement part of the beam terminal conductor By treating s that are interconnected by
For each transformer to be connected to phase 4, by preparing terminals/four bodies that connect concave or convex connection retaining parts to be combined with each other, connection work can be easily performed in a short time, This prevents the contents of the transformer from being exposed to the atmosphere for a long period of time, thereby avoiding deterioration in insulation reliability. Also, in normal times, the insulation strength can be increased by combining a dummy electrode with the terminal conductor.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
Fig. 1 is a schematic diagram showing a transformer, Fig. 21A is a vertical sectional view showing a terminal device, Fig. 3 is a longitudinal sectional view showing another embodiment of the terminal device, and Fig. 4 is a transformer lf. FIG. 2 is a schematic FIt diagram showing the connection state of FIG. DESCRIPTION OF SYMBOLS 1... Terminal conductor, 2... Connection maintaining part, 4... Insulating coating, 5... Insulating barrier, 7... Dummy electrode, 8...
...Engagement part, 9...Insulation coating, 10...Insulation barrier, 13...Connection engagement part, 14 Engagement part, 101...
Transformer tank, 103... Winding wire, 104... Pocket, 105... Pocket, 106... Lead wire, 10
7... Connection duct.

Claims (1)

[Claims] A terminal conductor provided inside the transformer tank and connected to a lead wire drawn out from the transformer winding, and having a concave or convex connection engagement part at the tip, and a terminal conductor provided surrounding the terminal conductor. a dummy electrode that is removably engaged with the connection engagement portion of the terminal conductor;
an insulating barrier provided surrounding the dummy electrode, and the terminal conductor connection retaining portion is connected and engaged with a convex or concave connection retaining portion of the terminal conductor in another transformer. 9 of transformers characterized by
) 11-wire terminal equipment.