JPH0342691B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a stationary induction device, and particularly to a stationary induction device that cools the side surface of an iron core by flowing a liquid cooling medium.

[Conventional technology]

Below, regarding conventional stationary induction equipment, using an external iron type evaporative cooling type gas insulated transformer as an example, Figures 6 to 10 will be explained.
This will be explained with reference to the figures. 6, 7 and 8, 1 is a coil group, 2 is an iron core,
3 is an upper scissors having a plurality of grooves 3a formed on its upper surface, the details of which are shown in FIGS. 9 and 10. 4 is a lower scissor tree, and 5 is a wooden brace, which is provided in some places to ensure the dimension between the iron core and the tank. A refrigerant (liquid) 6 flows down from the top of the tank, passes through the groove 3a of the upper scissors 3, and flows down to the side surface of the iron core 2. 7 is a tank, and 8 is a core presser.

In the above configuration, since the refrigerant 6 flowing down from the upper part of the tank 7 does not necessarily flow down uniformly, the amount of the refrigerant 6 flowing through each groove 3a may become uneven. In addition, since the width of the groove 3a is wide and the pitch _g1 is also large, the refrigerant 6 that has passed through the groove 3a does not flow down the side surface of the iron core 2 uniformly. does not flow down, and therefore a large amount of refrigerant is required to cool the iron core 2, which is the heat generating part, and there is also concern about local temperature rise. Furthermore, since a large amount of refrigerant 6 must flow, it is necessary to increase the cross-sectional area of the scissor grooves 3a, and as a result, the grooves 3a become deeper, and in turn, the upper scissors 3 need to be made thicker.

Also, since the width (W ₁ ) of the iron core 2 and the width (W ₂ ) of the upper scissors 3 are the same, the refrigerant 6 flows through the iron core 2 due to the flow velocity through the upper scissors 3 as shown in FIG.
It flows not only over the sides of the iron core 2 but also through the space between the iron core 2 and the tank 7.
The refrigerant flowing down in the space between them does not contribute to cooling the iron core 2 and flows out.

[Problem that the invention seeks to solve]

In conventional static induction equipment as described above, the refrigerant does not flow uniformly down the side of the iron core, which may cause a local temperature rise in the iron core, and because some of the refrigerant flows down without cooling the iron core, There were problems such as the need for a large amount of refrigerant.

This invention was made to solve these problems, and even if the refrigerant flowing down from the upper part of the tank is not uniformly distributed, it can be ensured that it flows down evenly to the side of the iron core, so that it can be applied to localized areas of the iron core. Prevents temperature rise,
Another object of the present invention is to obtain a stationary induction device that can reduce the amount of refrigerant used.

[Means for solving problems]

The stationary induction device according to the present invention is provided with a refrigerant reservoir in the upper scissors, and the refrigerant that is distributed in the refrigerant reservoir and flows out from the groove flows down the side of the core via the upper edge of the core. It is.

[Effect]

In this invention, even if the refrigerant flowing down from the top of the tank is not uniformly distributed, the refrigerant is once stored in the refrigerant reservoir, so the refrigerant flows uniformly through the grooves that guide the refrigerant to the side surface of the iron core. In addition, since the refrigerant flowing out of the grooves of the upper scissors once contacts the upper edge of the core and then flows down the side of the core, there is almost no refrigerant flowing down the space between the core and the tank without contributing to cooling.

〔Example〕

1 to 5 show an embodiment of the present invention,
A groove-shaped refrigerant reservoir 3b is formed in the upper scissors 3, perpendicular to the grooves 3a of the upper scissors 3, and passing through approximately the center of the width of the grooves 3a. Width of upper scissor tree 3 (W ₃ )
is narrower than the width (W ₁ ) of the iron core 2, and a stepped portion 2a is formed at the upper edge of the iron core 2. In addition, the groove 3a has a groove width smaller than that of the conventional groove, and a groove pitch.
g ₂ is also made smaller and subdivided. Others, 6th
The same reference numerals in FIGS. 1 to 10 indicate the same parts.

With the above configuration, the refrigerant 6 flowing down from the upper part of the tank 7 is guided from the groove 3a to the refrigerant reservoir 3b, is once stored in the refrigerant reservoir 3b, and is then distributed to the groove 3a and flows down the side surface of the iron core 2. Therefore, even if the refrigerant 6 is not uniformly distributed when it flows down from the upper part of the tank, the flow rate is adjusted in the refrigerant reservoir 3b, and the refrigerant flows in a well-balanced manner in the groove 3a that guides the refrigerant to the side of the iron core. This eliminates variations in flow rate due to the grooves 3a. In addition, since the width of the upper scissors 3 is narrowed so that a stepped portion 2a is formed on the upper edge of the iron core 2, almost no refrigerant flows down through the space between the iron core 2 and the tank 7 in the past. Summer. That is, since the refrigerant flowing through the grooves 3a of the upper scissors 3 has a flow velocity, if the scissors 3 and the iron core 2 were of the same width, the refrigerant would sometimes jump out from the ends and flow down, but as in this embodiment, If there is a step 2a in the groove 3a, the refrigerant flowing out from the groove 3a will once contact the step 2a and then flow down the side of the core, so the flow velocity will be reduced.
The amount of refrigerant that spills out into the space is extremely small.

Note that the position and shape of the refrigerant reservoir 3b may be variously modified in addition to those shown in the above embodiments.

〔Effect of the invention〕

As is clear from the above description, this invention
By providing a refrigerant reservoir in the upper scissors, the refrigerant flows in a well-balanced manner through the grooves, preventing a local temperature rise in the iron core, and also allows the refrigerant to flow down through the upper edge of the iron core. Almost no refrigerant flows down the space between the iron core and the tank, reducing the amount of refrigerant used.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention,
Figure 1 is a front sectional view of the main part, Figure 2 is a side sectional view of the main part,
Figure 3 is a partially enlarged view of Figure 1, Figures 4 and 5.
The figure is a partial plan view and side view. Figure 6~
Fig. 10 shows a conventional stationary induction device, Fig. 6 is a front sectional view of the main part, Fig. 7 is a side sectional view of the main part, Fig. 8 is a partially enlarged view of Fig. 6, Fig. 9 and FIG. 10 is a partial plan view and side view. 2... Iron core, 2a... Step part, 3... Upper scissor tree, 3
a...Groove, 3b...Refrigerant reservoir, 6...Cooling medium. In addition,
In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. In a stationary induction device in which a cooling medium made of an insulating liquid flows down the side of the core through a plurality of grooves formed in the upper scissors of the iron core, the cooling medium formed in the upper scissors A stationary induction device comprising: a refrigerant reservoir portion in which a plurality of grooves communicate with each other; and a step portion formed by a downstream end of the groove and an upper edge of the iron core. 2. The stationary induction device according to claim 1, comprising a groove-shaped refrigerant reservoir formed perpendicularly to the groove in the center of the width of the upper scissors. 3. The stationary guidance device according to claim 1, comprising an upper scissor whose width is narrower than the width of the iron core.