JPH0824089B2 - Simplification of anti-chlorination method of trans bushing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an existing pole trans bushing to withstand chloride.

[0002]

[Technical background] A trans bushing is a member used for introducing a high-voltage pull-down wire to a transformer. Usually, a terminal metal fitting and a high-voltage pull-down wire are connected in the transformer in an insulator skirt portion fixed to a transformer outer plate. .

In this trans bushing, those used in salt-damaged areas near the coastline have been subjected to a chlorination-proof treatment as shown in FIGS. 4 and 5. That is, in the structure shown in FIG. 4, a mold cone 2 is formed at the end of a high voltage pull-down wire (hereinafter referred to as PDC) 1, the conductor 1a and a lead wire 3 into the transformer are pressure-bonded, and the mold cone 2 is connected to the transformer. The insulator 5 fixed to the outer plate 4 is pressed and bonded, and the epoxy resin 6 is injected into the connection portion to hide the bare charging portion. Further, in the structure shown in FIG. 5, the conductor 1a of the PDC 1 is inserted into the wedge-shaped connector 7 at the end of the lead wire 3 and the cap screw 8 is screwed into the insulator 5 to reduce the diameter of the wedge connector 7 and thereby lead 3 And PDC1 are connected, and further, the packing 9 is inserted into the upper part of the holding screw 8, and the holding screw 10 is screwed into the female screw, and the insulator 5, the holding screw 8, the packing 9 and the holding screw 10 are connected to the bare charging part. The salt content is prevented from entering and the occurrence of a surface flashover (ground fault) between the transformer outer plate 4 and the bare charging section is prevented.

On the other hand, in the general area, in consideration of economy, the salt-resistant bushing described above is not used, but the one shown in FIG. 3 is used. That is, in the insulator skirt portion 5a fixed to the transformer outer plate 4, the connection fitting 11 at the end of the lead wire 3 is provided in an exposed state, and the hole 11a of the connection fitting 11 is provided.
PD led from the notch 12 at the opening edge of the skirt 5a
The PDC is inserted through the C1 and the connecting ring 11 is screwed into the connection fitting 11 from the tip thereof via the pressure contact ring 11b.
1 is pressure-connected to the connection fitting 11 (see FIG. 1).

Since the bare charging part P is exposed in this bushing, salt is deposited easily as shown by the point in the figure, and when it is deposited, the bare charging part P and the transformer outer plate 4 are connected,
That is, a creeping flash is likely to occur, but in the general area, there is no salt damage unlike the coastline, and this bushing is sufficient.

However, if a wind typhoon approaches or lands in these areas once or twice in several decades, seawater droplets will be carried beyond the critical area (salt damage area) to a considerable depth in these general areas. There are cases. In this case, the above-mentioned salt content is accumulated, which causes creeping flashover or tracking.

As a means for preventing this, general areas are also shown in FIG.
The salt-resistant bushing shown in FIG. 5 may be replaced or adopted, but the cost is enormous, and the effect is extremely small once every several decades, which is not preferable in terms of investment efficiency.

[0008]

SUMMARY OF THE INVENTION In view of the above points, the present invention is to make the bushing already installed in the general area low in chlorination resistance at low cost and easily and in a live state. Is an issue.

[0009]

In order to solve the above-mentioned problems, according to the present invention, the skirt portion opening edge and the knob of the pole-mounted transbushing of the general area where the bare charging portion P shown in FIG. 3 is exposed. After closing the gap with the adhesive band-shaped member and inserting the injection pipe from the notch, the inner surface of the notch and P
A structure was adopted in which a weather resistant insulating putty was filled in the gap with the DC to close it, and the time-curable liquid compound was injected and filled from the injection pipe into the skirt portion.

An elastic cap extending from the knob side to the skirt opening edge may be fitted to close the gap between the skirt opening edge and the knob. Further, the exhaust pipe can be inserted through the notch so that its end can reach the lower surface of the knob.

[0011]

According to the chlorination-resistant method of the present invention having the above-mentioned structure, since each of the simple operations such as winding of the adhesive strip-shaped member, packing of the insulating putty, and pouring of the liquid compound, only the pillar can be easily and easily You can work smoothly. By injecting and filling the liquid compound, salt invasion into the bare charging part is prevented, and the invasion is about once every several decades. Therefore, the compound can be sufficiently filled to prevent the salt.

Considering the disassembly after the treatment, it is preferable to use a compound that can be easily disassembled after solidification.

[0013]

EXAMPLE As shown in FIG. 1, an insulating exhaust pipe 14 made of plastic or the like and an injection pipe 15 are inserted into a notch 12 through which a PDC 1 penetrates, and the end of the exhaust pipe 14 reaches the lower surface of a knob 13. The notch 12 is filled with weather resistant insulating putty 16 to close the notch 12.

Next, the opening edge of the skirt portion 5a and the knob 13 are formed.
A weather resistant self-adhesive insulating tape 17 is wound between them to close the gap. After that, a time-curable liquid compound 18, for example, High Jura No. 4492 manufactured by Sumitomo 3M Limited, is injected and filled from the injection pipe 15 into the skirt portion 5a. By this filling, the bare charging part P is insulation-coated and is resistant to chloride.

In this embodiment, the winding layer of the insulating tape 17 can be pierced and evacuated and injected.
Further, it is not always necessary to exhaust the air. It goes without saying that the compound 18 may be any compound other than the above, as long as it can be disassembled after solidification.

In the embodiment shown in FIG. 2, the gap between the opening edge of the skirt portion 5a and the knob 13 is closed by a cap 19, and the cap 19 is made of an insulating elastic material such as weatherproof rubber and is provided from the knob 13 side. Cover. After covering, the liquid compound 18 is injected and filled in the same manner as described above. The cap 19 may have no upper surface, that is, only the tubular portion.

[0017]

The present invention is constructed as described above, and the adhesive band-shaped member, the cap and the putty are used to close the gap, and the time-curable liquid compound is used to insulatively cover the bare charging part. The work can be performed in a line state, and the work is also easy. Therefore, the existing bushing can be subjected to a chlorination-resistant treatment easily at low cost.

[Brief description of drawings]

FIG. 1 is a cutaway front view of a main part of an embodiment.

FIG. 2 is a cutaway front view of a main part of another embodiment.

FIG. 3 is a cross-sectional view of a general trans bushing.

[Figure 4] Cross-section of trans-bushing in salt-damaged area

[Fig. 5] Cross-sectional view of trans bushing in salt damage area

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-voltage pull-down wire (PDC) 1a Conductor 2 Mold cone 3 Lead wire 4 Transformer outer plate 5 Insulator 5a Insulator skirt part 11 Connection metal fitting 12 Notch (PDC insertion hole) 13 Knob 14 Exhaust pipe 15 Injecting pipe 16 Insulating tape 17 Insulating tape 18 Time-curable liquid compound 19 Cap P Bare live part

Claims (3)

[Claims] 1. A cylindrical insulator skirt portion is formed on an insulator base portion fixed to a transformer outer plate, and a metal connecting fitting is provided in the skirt portion in an exposed state, and the connecting fitting is provided with a notch at an opening edge of the skirt portion. Insert the high-pressure pull-down wire that has been introduced, and use a knob that is screwed from the tip of the connection fitting to press-connect the high-pressure pull-down wire to the connection fitting. After the injection pipe is inserted from the notch, the gap between the notch inner surface and the high-voltage pull-down line is filled with weather-resistant insulating putty to close the inside of the skirt portion from the injection pipe. A simple method of anti-chlorination of trans bushing which is characterized by injecting and filling a curable liquid compound. 2. The transchlorination method according to claim 1, wherein an elastic cap extending from the knob side to the skirt opening edge is fitted to close the gap between the skirt opening edge and the knob. A simple anti-chlorination method for trans bushing. 3. The exhaust pipe is inserted through the notch, and the end of the exhaust pipe is brought to the lower surface of the knob.
A simple method for transchlorination resistance of the trans bushing described in.