CN201732656U

CN201732656U - Lower iron yoke insulating structure of natural oil circular transformer

Info

Publication number: CN201732656U
Application number: CN2010202600572U
Authority: CN
Inventors: 陈新东; 张中
Original assignee: Jiangsu Sunel Transformer Co Ltd
Current assignee: Jiangsu Sunel Transformer Co., Ltd.
Priority date: 2010-07-16
Filing date: 2010-07-16
Publication date: 2011-02-02
Anticipated expiration: 2020-07-16

Abstract

The utility model provides a lower iron yoke insulating structure of a natural oil circular transformer, which comprises a lower iron yoke end ring and a lower iron yoke supporting plate, wherein cushion blocks which are distributed along the circumference are stuck on a paper ring of the lower iron yoke end ring and extend into the circumference of the inner diameter of the paper ring; and lug bosses which are uniformly distributed towards the center of the circle are arranged on the circumference of the inside diameter. On the basis of the traditional structure, an oil inlet channel at the lower part of an inner coil is added on the lower iron yoke insulating structure of the natural oil circular transformer, so that cooling oil can effectively flow into the inner coil from the iron core side, thereby fully improving the cooling effect of the inner coil of the natural oil circular transformer and reducing the temperature rise of the inner coil.

Description

A kind of lower yoke insulation system of Natural Oil Circulation Power transformer

Technical field

The utility model relates to field transformer, is a kind of lower yoke insulation system of Natural Oil Circulation Power transformer specifically, is specially adapted to the three-winding power transformer of the big capacity Natural Oil Circulation Power of superhigh pressure.

Background technology

Usually, the type of cooling of middle-size and small-size transformer adopting Natural Oil Circulation Power, extra-high-voltage large-capacity transf adopts the type of cooling of forced oil-circulation, but adopt the transformer operation expense height and the noise of the forced oil-circulation type of cooling big, therefore the jumbo transformer of current superhigh pressure also trends towards adopting the type of cooling of the Natural Oil Circulation Power that operation expense is low, noise is little.The jumbo three-winding transformer of superhigh pressure, when adopting the Natural Oil Circulation Power type of cooling, generally adopt conventional annular lower yoke insulation system at present, the flow velocity of cold oil and flow are much smaller than the type of cooling of forced oil-circulation, this structure makes the oily passage that enters the coil bottom that a kind of approach in the exterior loop outside only be arranged, after cold oil will be distributed to the outside and center pillar coil earlier, just flow into interior loop, after shunting, the flow velocity that flows into interior loop oil is slower, flow is littler, thereby the radiating effect of interior loop is greatly reduced, even it is higher temperature rise to occur, cause ageing of insulation, influence the useful life and the safe operation of transformer.

Summary of the invention

The technical problems to be solved in the utility model is: a kind of lower yoke insulation system that improves the Natural Oil Circulation Power transformer of transformer interior loop cooling effect is provided.

The technical scheme in the invention for solving the technical problem is: a kind of lower yoke insulation system of Natural Oil Circulation Power transformer, comprise lower yoke end circle and lower yoke supporting plate, be pasted with the cushion block that is uniformly distributed along the circumference above the paper circle of lower yoke end circle, the cushion block of lower yoke end circle stretches into the internal diameter circumference 30mm of paper circle, is evenly distributed with the boss to center of circle direction on the internal diameter circumference of lower yoke supporting plate.

Be evenly distributed with four boss to center of circle direction on the internal diameter circumference of described lower yoke supporting plate, boss is 30mm to the height W of center of circle direction, and boss width L along the circumferential direction is 120～150mm.

The beneficial effects of the utility model are: the utility model adopts boss shape lower yoke insulation system, increased the admission passage of a cold oil, make cold oil flow into interior loop effectively from core side, the cooling effect of interior loop is able to obvious improvement, has reduced the interior loop temperature rise.The utility model cost is extremely low, makes, and is easy for installation.

Description of drawings

Fig. 1 is that the oil of the lower yoke insulation system of Natural Oil Circulation Power transformer of the present utility model flows to schematic diagram;

Fig. 2 is a lower yoke supporting plate schematic diagram among Fig. 1;

Fig. 3 is the lower yoke end circle schematic diagram among Fig. 1;

Embodiment

Referring to accompanying

drawing

1,2,3, a kind of lower yoke insulation system of Natural Oil Circulation Power transformer, comprise lower yoke end circle 1 and lower yoke supporting plate 2, be pasted with the cushion block 3 that is uniformly distributed along the circumference above the paper circle of lower yoke end circle 1, the cushion block 3 of lower yoke end circle 1 stretches into the internal diameter circumference 30mm of paper circle, is evenly distributed with the boss 4 to center of circle direction on the internal diameter circumference of lower yoke supporting plate 2.

Be evenly distributed with four boss 4 to center of circle direction on the internal diameter circumference of described lower yoke supporting plate 2, boss 4 is 30mm to the height W of center of circle direction, and boss 4 width L along the circumferential direction is 120～150mm.

The paper circle and the cushion block 3 of the lower yoke end circle 1 after the improvement have formed oily inflow entrance, and owing to the boss that is evenly distributed with on the internal diameter circumference of lower yoke supporting plate 2 to center of circle direction, increased the admission passage of a cold oil, make cold oil flow into interior loop effectively from core side, the cooling effect of interior loop is able to obvious improvement, has reduced the interior loop temperature rise.In the application of actual product, also should join out wire hole at lower yoke supporting plate and end circle relevant position according to terminal position, coil bottom.The lower yoke insulation system cost of Natural Oil Circulation Power transformer of the present utility model is extremely low, makes, and is easy for installation.

Claims

1. the lower yoke insulation system of a Natural Oil Circulation Power transformer, comprise lower yoke end circle (1) and lower yoke supporting plate (2), be pasted with the cushion block (3) that is uniformly distributed along the circumference above the paper circle of lower yoke end circle (1), it is characterized in that: the cushion block (3) of lower yoke end circle (1) stretches into the internal diameter circumference 30mm of paper circle, is evenly distributed with the boss (4) to center of circle direction on the internal diameter circumference of lower yoke supporting plate (2).

2. the lower yoke insulation system of Natural Oil Circulation Power transformer according to claim 1, it is characterized in that: be evenly distributed with four boss (4) on the internal diameter circumference of described lower yoke supporting plate (2) to center of circle direction, boss (4) is 30mm to the height W of center of circle direction, and boss (4) width L along the circumferential direction is 120～150mm.