JPS6167907A - oil-filled appliances - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to oil-filled electrical appliances such as transformers and reactors, and particularly relates to a lower oil conduit structure for cooling windings.

[Background of the invention]

In the conventional device, as described in Japanese Utility Model Application Publication No. 54-56720, the lower core tightening fitting is box-shaped, and the
The structure was such that the two sections were connected by a flexible connecting tube.

However, no consideration was given to reducing stray loss (preventing local heat) of the lower core clamping fittings due to leakage magnetic flux from the windings and reducing weight.

[Purpose of the invention]

An object of the present invention is to reduce the stray loss of the lower core clamp due to leakage magnetic flux from the windings, reduce the weight of the lower core clamp, and provide a small and lightweight transformer.

[Summary of the invention]

The present invention provides a flat plate shape for the lower core tightening fitting and a
The weight of the winding is supported by an insulated bracket installed perpendicularly to the auxiliary stay of the lower core clamping bracket, and an insulating closing plate is attached to this to form a box-shaped oil passage, which is connected between tanks and between each phase (each The iron core legs (between the core legs) are connected using expandable insulating tubes to allow insulating oil from the cooler to flow into the windings.

[Implementation sequence of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. The winding 2 is wound around the iron core leg 1a, and the lower yoke 1b
It has been partially accepted. The lower yoke 1b is held down by a flat plate-shaped core clamping fitting 3, and the clamping is fixed by a plurality of core stands 4. An auxiliary stay 12 is welded to a flat iron core clamping fitting 3 at the bottom of the winding 2, and a winding support 7 made of an insulator is fixed with a mounting bolt 13. This winding receiver 7
The load of the winding 2 can be received by arranging the core stand 4 at the lower part of the core 4. Furthermore, by providing the auxiliary stays 12 on both sides of the winding support 7, the winding support 7 will not fall over. By closing the front surfaces of these two winding receivers 7 with a closing plate 9 and fixing them with insulating bolts 14, a box-shaped oil passage is formed, and an oil passage hole 10 is provided in the lower winding clamp (insulator) 8. This allows the insulating oil 11 to flow into the winding 2. Furthermore, an oil channel hole 16 for passing the insulating oil 11 is provided in the winding support 7, and an insulation expandable/contractable space is formed between this and the tank 5! ? 6
One end is fixed to the tank 5, and the other end is attached to the winding support 7 with an insulating bolt 15.

Similarly, each phase (between each core leg) is also connected by an insulating expandable tube 6 and fixed with a winding support 7 and an insulating bolt 15.

With this structure, the oil passage for passing the insulating oil can be formed of an insulating material, and the insulating oil 11 from the cooler (not shown) outside the tank 5 can be passed through the insulating expansion pipe 6 and the box. It can flow into the winding 2 via the shaped oil passages 7 and 9, the underlined lower clamp 80 and the oil passage hole 10.

Fig. 4 shows another embodiment of the present invention, which differs from Fig. 1 in that each phase (between each core leg) is connected by a single edge pipe 17, and the lower part of the winding is connected to the opposite part. This is because the oil passage hole 18 is provided.

〔Effect of the invention〕

According to the present invention, since the area where the flat iron core fastening fitting faces the winding is small, stray loss due to leakage magnetic flux from the winding can be reduced. Therefore, local overheating can be prevented, and reliability can be improved without causing insulation deterioration in the winding lower clamp or the like.

[Brief explanation of the drawing]

Fig. 1 is a lower front view of a transformer according to an embodiment of the present invention;
The figures are a partial sectional view of FIG. 1 and a third sectional view showing one embodiment of the present invention.
1 is a side view of FIG. 1 showing one embodiment of the present invention, and FIG. 4 is a front view of the lower part of a transformer showing another embodiment of the present invention. 3...Flat iron core tightening fitting, 7...Winding receiver, 12.
... Auxiliary stay, 17... Insulation tube.

Claims (1)

[Scope of Claims] 1. In an oil-filled electrical equipment that is provided with a lower core tightening fitting that tightens the iron core and supports the winding, and in which insulating oil is forced to flow into the winding, the lower iron core tightening fitting is formed of a flat plate. An insulating winding support is fixed to the auxiliary stay attached to this structure to receive the load of the winding, and the insulating material is shaped into a box to form an oil channel, and between this and the tank and each An oil-filled electrical appliance characterized in that the insulating oil is connected through an interphase insulating tube, and the insulating oil is passed through the insulating tube and flows into the winding. 2. In claim 1, two insulating plates are vertically erected below the windings of the lower core fastening fitting of the flat plate, and a closing plate of the insulating plates is attached to form a box-shaped oil passage. An oil-filled electrical appliance characterized in that a hole is formed in the insulating plate of the mounting portion of the insulating tube to allow insulating oil to flow therein. 3. According to claim 1, each phase is communicated with the insulating tube, and an oil passage hole is provided at a position opposite to the winding to allow insulating oil to flow into the winding. Oil-filled electrical equipment.