JPS6285415A - 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 passage 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 clamping fitting has a box-shaped structure. However, no measures were taken to reduce the stray loss of the lower core clamping fittings due to magnetic flux leakage from the windings (rl-calheat prevention measures) and to reduce the weight.

[Purpose of the invention]

The purpose of the present invention is to reduce the stray loss of the lower core clamping fittings due to magnetic flux leakage from the windings, reduce the weight of the lower core clamping fittings, and provide a compact, one-piece transformer. There is a particular thing.

[Summary of the invention]

The present invention provides a flat plate shape for the lower core tightening fitting, and
The weight of the windings 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 channel. ) is characterized in that a box-shaped connecting fitting is welded between the auxiliary stays of the lower core clamping fitting to form an oil channel, and the insulating oil in the oil channel flows into each winding.

[Embodiments 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 its weight is partially supported by the lower yoke 1b.

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 attached to the flat iron core tightening fitting 3 at the bottom of the winding 2.
are welded, and an insulating winding support 7 is fixed to the mounting pole 1 with 13. By providing the auxiliary stay 12 on one side of the winding book 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 arrangement is formed, and an oil hole 10 is provided in the lower winding clamp (insulator) 8. This allows the insulating oil 11 to flow into the winding 2. Furthermore, the winding support 7 is provided with an oil hole 16 for passing the insulating oil 11, and a co-contact is provided in both the flat iron core clamping fitting 3 and the auxiliary stay 12 in order to connect each phase (between each core leg). By welding the shaped connecting fittings 17, it becomes a box-shaped piece of music.
By providing the oil hole 19 in the auxiliary stay 12, the music selections formed by the winding receiving tree 7 and the closing plate 9 are connected. If these song selections and the tank 5 are connected with a connecting pipe (not shown), the insulating oil 11 from the cooler (not shown) outside the tank 5 can be transferred to the winding receiver 7 of each phase (each winding). The oil flow is caused to flow into the /111 path formed by the and closing plate 9, and the oil passage hole 1 () of the winding lower clamp 8 is routed through -1. , ・Connected with the preventive coupling tool 17,
This is because an oil hole 18 is provided in the lower part of the winding opposite to each other.

〔Effect of the invention〕

According to the present invention, since the area where the flat plate core clamp members face the windings is small, the connecting metal fittings between each phase (between each core leg) are further connected to each other at a position distant from the windings. between iron core legs)
Since the magnetic flux is only present in the windings, stray hair loss due to leakage magnetic flux from the windings can be reduced.

Therefore, it is possible to prevent local heating and to provide a highly reliable product without deteriorating the insulation at the lower clamp of the winding.

[Brief explanation of drawings]

FIG. 1 is a front view of the lower part of a transformer according to an embodiment of the present invention, FIG. 2 is a partial sectional view of FIG. 1, FIG. 3 is a side view of FIG. It is a front view of the lower part of a transformer which shows an Example. 3...Flat iron core clamping member, 7...Winding receiver, 12.
...Auxiliary stay, 1.7...Connection fittings.

Claims (1)

[Claims] 1. In an oil-filled electrical appliance that is equipped with a lower core clamping bracket that tightens the core and supports the winding, and in which insulating oil is forcibly flowed into the winding, the lower core clamping bracket has a flat plate structure and is attached to the lower core clamping bracket. An insulator winding bracket is fixed to the auxiliary stay, which receives the load of the winding, and the insulator is shaped into a box to form an oil passage, and the lower core is tightened to connect each phase. An oil-filled electrical appliance characterized in that a connecting fitting is welded to create an oil channel between auxiliary stays attached to the fitting, and the insulating oil is forced to flow into the winding through the connecting fitting.