JPS5854492B2 - Transformer lead wire support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a lead wire support device for a transformer.

Generally, as shown in Figures 1 to 3, a large number of parts are required to support the internal lead wires of large transformers for power transmission and distribution, and the number of joints increases. The structure was complicated, that is, a plurality of tap lead wires 6 were drawn out from the winding 1 built in the transformer tank (not shown) through an insulating tube (not shown), as shown in Fig. 2. As shown in Fig. 3, rod-shaped insulators are fixed to upper and lower fasteners 7 used for tightening the iron core (indicated by two-dot chain lines) through insulating plates 2 and bolts 8, respectively, and arranged in the vertical direction. Insulating plate 4 on object 3,
It was fixed at multiple places via 5 and guided upward.

For this reason, many man-hours are required for assembling the inside of the transformer and fixing the multiple tap lead wires 6, and it is also necessary to install many parts such as the insulator 3 and the insulating plates 2 and 4. Since a large amount of space is required, a large amount of transformer oil is required to enter the transformer tank, and at the same time, the external dimensions of power transmission and distribution transformers further increase, resulting in an increase in the amount of steel plates.

Therefore, there were drawbacks such as an increase in weight due to an increase in external dimensions.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, to support multiple tap lead wires with a simple structure that reduces the installation space and installation parts, and to reduce the number of work steps. An object of the present invention is to provide a lead wire attachment device for a transformer that can reduce the size and weight of the transformer.

The present invention allows multiple tap lead wires to be drawn out from the winding built into a transformer tank through an insulating cylinder and guided upward along the outside of the winding. It is surrounded by a flexible insulator, and supported by an insulating band on the outer peripheral surface of an insulating tube disposed on the closest side of the winding.

An embodiment of the transformer lead wire support device of the present invention will be described below.
This will be explained using FIGS. 4 to 7, in which the same parts as the conventional one are indicated by the same reference numerals.

A plurality of tap lead wires 6 are drawn out through holes (not shown) made in an insulating tube 12 arranged concentrically outside the winding 1, and are drawn out from insulating paper attached to the outer periphery of the insulating tube 12. It is wrapped in a flexible insulator 10 for tightening, and the tightening is fixed at multiple locations by tightening bands 11 that are passed through small holes (not shown) formed in the insulating cylinder 12 in advance. is being drawn out.

Therefore, instead of holding the transformer with an insulating plate or insulating material as in the past, an insulating cylinder 12 disposed on the outermost side of the transformer winding 1 in a space inside the transformer that has not been used conventionally is used to maintain the insulation. A mounting structure that minimizes the space occupied by enclosing a plurality of tap lead wires 6 in a tube 12 with a flexible insulator 10 and fixing them with a tightening band 11 passed through a small hole in the insulating tube 12. It becomes.

Since the transformer lead wire support device of this embodiment is configured as described above, the members for supporting each tap lead wire inside the transformer tank are the conventional insulator 3, insulating plate 2, . 4. 5 and the like, the space occupied by only the flexible insulator 10 and the tightening band 11 is significantly reduced.

As a result, the tightening and installation work of the connecting parts is reduced, resulting in a structure with fewer defective parts.

Additionally, as the space occupied by the supporting portions of multiple tap lead wires is reduced, the transformer tank can be made smaller.
The number of steel plates that make up the transformer tank can be reduced, the amount of insulating oil to be injected can also be reduced, and a smaller and lighter transformer can be formed.

As described above, the transformer lead wire support device of the present invention can be constructed with a simple structure, reduces the number of parts and space for installing multiple tap lead wires, reduces the number of installation work, and is suitable for power transmission and distribution. This has the excellent effect of making a large transformer smaller and lighter.

[Brief explanation of the drawing]

Figure 1 is a front view of the conventional lead wire attachment part inside the transformer.
Fig. 2 is a right side view of Fig. 1, Fig. 3 is a perspective view for explaining the coupling relationship of the lead wire attachment parts of Fig. 1, and Fig. 4 is an embodiment of the lead wire support device for a transformer according to the present invention. A front view of the example, Fig. 5 is a perspective view of the flexible insulator when the lead wire support device of Fig. 4 is wrapped, and Fig. 6 is a plurality of taps made of the flexible insulator of Fig. 4 FIG. 7 is a perspective view of a state in which the lead wires are supported, and FIG. 7 is a longitudinal sectional view of a portion of the lead wire attachment portion of FIG. 4. 1... Winding wire, 6... Tap lead wire,
10... Flexible insulator, 11... Tightening band, 12... Insulating cylinder.

Claims (1)

[Claims] 1. A transformer tank has a built-in winding with an insulating tube disposed on the outermost side, and a plurality of tap lead wires are guided upward from the winding through the insulating tube along the outside of the winding. In the supporting device, the plurality of tap lead wires are wrapped in a flexible insulator, and are fastened and supported on the outer peripheral surface by an insulating band that passes through a small hole formed in the insulating tube. Characteristic transformer lead wire support device.