JPH03218003A - Fixing method of on-load tap changer - Google Patents

Abstract

PURPOSE:To simplify structure, reduce the external diameter size of a tank, and decrease weight and oil amount, by temporarily fixing an on-load tap changer from the lower side, and boosting and fixing it to the flange of an upper tank after wire connection is finished. CONSTITUTION:Until the wire connection of an on-load tap changer (OLTC) is finished, the OLTC main body 1 is directly layed down and temporarily fixed by using the flange 4 of a lower tank 3, and tap lead connection and inside fastening are performed. The main body is covered with an upper tank 5, and suspension bolts 11 are fixed to the upper part of the main body 1, thereby hanging it up with a wire 12. After the main body 1 is fixed with fixing bolts 13, an O-ring 15 and a cover 16 are fixed. Thereby a complicated upper retaining member is unnecessitated, structure is simplified, and the external diameter size is reduced, so that oil amount and total weight can be reduced.

Description

[Detailed Description of the Invention] A. INDUSTRIAL APPLICATION FIELD This invention relates to a method for mounting an on-load tap changer in a bell-type tank, in which the on-load tap changer is suspended from an upper tank of a transformer tank.

B. Summary of the Invention The present invention provides a method for installing a load tap changer in a bell-type tank in which the load tap changer is suspended from the upper tank side. Connect the on-load tap changer by fixing it with the support member attached to the mounting bracket, and after completing the wiring, lift the on-load tap changer body, attach the on-load tap changer body to the flange of the upper tank, and then By attaching a cover to this flange through an O-ring, the structure is simplified by eliminating the complicated support member at the top, eliminating the need for a flange for the load tap changer, reducing tank external dimensions and weight. This makes it possible to reduce the amount of oil used.

C. Conventional technology pen-type (bell-shaped) tank transformers are equipped with on-load tap changers:
The OLTC (hereinafter abbreviated as OLTC) is suspended from the top of the tank as shown in FIG. 3(d). FIG. 3 is a sectional view of a main part for explaining the method of attachment. In these figures, the right side of the figure is the OLTC section, and the left side is the transformer section. In the figure, 3l is the main body of OLT C,
Reference numeral 32 denotes an upper clamping fitting of the transformer, and numeral 33 denotes a support member, which is fixed to the upper clamping fitting 33 and supports the OLTCC 7) wooden body 3l. 34 is a flange provided on the top of the OLTC,
35 indicates the upper tank.

When installing the OLTC main body, as shown in FIG. 3(a), attach the support member 33 to the upper clamping fitting 32, hang the flange 34 on the upper part of the OLTC main body from this, and temporarily hold the OLTC main body 31. Fix it. Then, in this state, connect the OLTC tap leads and tighten the contents of the transformer, and after completing this, cover the upper tank 35,
Next, as shown in FIG. 3(b), attach the hanging bolt 41 to the OL.
Attach to TC flange 34 and use hanging wire 42 to connect OL
Lift up the 3L main body of the TC. Then, it is attached to the flange 36 of the upper tank using a mounting bolt 43.

Then, the wire 42 and hanging bolt 41 are removed.

Next, as shown in FIG. 3(c), the O-ring 44 is applied and the cover 45 is attached to the flange 36 using the mounting bolts 46. FIG. 3(d) shows the attached state.

D. Invention or problem to be solved However, in the case of medium capacity transformers, depending on the voltage, the height of the OLTC may be higher than the height of the core winding, so it is necessary to raise only the OLTC part above the tank height. In such a case, the structure of the support member 33 must become complicated.

Further, in the above conventional method, the flange 34 is required on the upper part of the main body 3I, and the width direction dimension of the tank in the OLTC is determined by the dimension of the flange 34 rather than the insulation dimension between the OLTC and the tank. This results in an increase in external dimensions, weight, and oil volume.

The present invention was created in view of these problems, and
The structure was simplified by eliminating the complicated support member at the top.
It is an object of the present invention to provide a method for attaching an on-load tap changer that does not require an upper flange of an OLTC and can reduce tank external dimensions, weight, and oil amount.

E. Means for Solving the Problems Means for solving the above problems in the present invention is a bell-type device that suspends the on-load tap changer from the upper tank side.
In the installation method for a tank load tap changer, fix the load tap changer with a support member attached to the lower tank or the lower tank and connect the load tap changer, and then connect the load tap changer after completing the wiring. Cover with the upper tank, then lift the on-load tap changer body, attach the on-load tap changer body to the flange of the upper tank, and then attach the cover to this flange via an O-ring.

F. Function The present invention performs temporary fixing for work from below until the OLTC is wired and lifted into the upper tank. As a temporary fixing method, you can use the flange of the lower tank to temporarily place it directly, you can set up a temporary stand at the bottom of the lower tank, or you can use the bottom of the lower tank to fix it temporarily. A support member may be attached and supported by the support member.

G. Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view for explaining an attachment method according to an embodiment of the present invention. Similarly to the conventional example, the figure (a) shows O
The structure of the LTC is shown in the middle of being installed, and Figure (d) shows the installed state. The right side of each figure is the OLTC section, and the left side is the core winding section. 1 is the main body of the OLTC, and 2 is the upper fastening fitting for the transformer core. Until the OLTC wiring is completed, the flange 4 of the lower tank 3 is used to tighten the main body. 1 directly and temporarily fix the main body 1, then connect the tap leads and tighten the contents.

Next, cover the upper tank 5, attach the hanging bolt 11 to the top of the OLTC main body 1 as shown in Figure (b), and wire I2
Lift up the OLTC main body l.

Then, attach the flange I of the upper tank 5 using the mounting port L3.
Attach the OLTC main body l to 4. Next, as shown in Figure (c), remove the wire l2 and the hanging bolt l1, put the O-ring l5 into the groove at the top of the flange 14, cover the cover 16, and attach the cover 16 to the flange I using the mounting port l7.
Attach to 4.

Figure (d) shows the state in which this installation is completed.

In the above embodiment, the flange 4 of the lower tank was used as a means for temporarily fixing the main body 1 of the OLTC, but as shown in FIG. A support member 7 is attached to 6, the end is supported by a stand 8,
It may be supported by this support member 7, or it may be simply placed on a temporary stand 8 on the bottom slope of the lower tank and supported on this stand, as shown in FIG. 7(b).

H. Effects of the Invention As described above, the present invention makes it possible to simplify the structure by eliminating the need for a complicated upper support member even if the OLTC section is higher than the contents of the transformer. The insulation dimension between the tap changer and the tank can be shortened due to the absence of a flange, and the external dimensions of the tank can be reduced. Therefore, the amount of oil and the overall weight can be reduced.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part for explaining one embodiment of the mounting dimensions of the present invention, Fig. 2 is an explanatory drawing of another embodiment of the present invention, and Fig. 3 is an explanatory drawing of a conventional mounting method. . 1, 3I...OLTC main body, 2.32...Upper clamping bracket, 3.Lower tank, 4.Flange, 5...Upper tank, 6...Lower clamping bracket, 7... Support member, 8.
・Stand, l1... Hanging bolt, l2... Wire, 13.
...Mounting bolt, 14...Tank flange, 15.
・・O-ring, 16 2 people outside the cover Figure 1 (1) , 2 pieces and qtn Ichijishi =? Dry bow 0bh
FI plot η11 Shishiko (a) Figure 1 (2) Houri Akira Ichitora first issue 10 assembly explanation flash (d) Figure 2 (b) Figure 3 (2)

Claims (1)

[Claims] (1) In a method for installing a load tap changer in a bell-type tank in which the load tap changer is suspended from the upper tank side, a support member is provided in which the load tap changer is attached to the lower tank or lower clamping fitting. , then connect the on-load tap changer with How to install an on-load tap changer characterized by attaching a cover to this flange via an O-ring