JPH0650685B2 - Gas insulation equipment - Google Patents

Description

The present invention relates to a self-cooling system in which a plurality of electric devices such as transformers are housed in a hermetically sealed container filled with insulating gas, and heat is dissipated from the surface of the container for cooling. The object of the present invention is to improve the gas-insulated equipment by equalizing the temperature of the insulating gas inside the container and effectively cooling the insulating gas.

[Conventional technology]

This conventional type does not take into consideration the homogenization of the internal temperature, and merely takes measures to increase the size of the container and increase the surface heat dissipation area.

[Problems to be Solved by the Invention]

In this case, the following drawbacks were not avoided. That is, (1) Since the temperature difference between the upper and lower insulating gases is large inside the container, the heat dissipation efficiency as a whole is poor, which is extremely uneconomical.

(2) As an example of such a gas insulation device, a patent application by the same inventor and the same applicant (Japanese Patent Application No. 63-1246).
There is a transformer in which two transformers are arranged above and below in the same container as shown in No. 60). In this case, the heat generated by the lower transformer is added to the heat generated by the upper transformer, resulting in a high temperature at the upper portion.
For this reason, in the upper transformer, it is necessary to take uneconomical measures such as lowering the heat generation amount while being aware of the drawback of lowering the current density or lowering the magnetic flux density and increasing the size of the upper transformer. Didn't get

[Means for Solving the Problems]

In order to solve the above drawbacks, the present invention provides a heat shield plate in the container in the horizontal direction and partitions the inside into upper and lower parts to block the flow of insulating gas so that the heat of the lower compartment does not affect the upper compartment. It effectively dissipates heat.

〔Example〕

1 (a) and 1 (b) are a front sectional view and a side sectional view showing an embodiment in which the present invention is applied to the device of the above patent application. In a container 1 having a gas-filled and sealed structure, a large-capacity transformer 2 is provided in the lower part and a small-capacity transformer 3 is provided in the upper part, and a heat shield plate 4 is attached in the middle to horizontally partition the inside of the container, and an upper section 5a is provided. And the lower section 5b, so that the insulating gas is prevented from flowing up and down.

In this case, the transformers 2 and 3 can be attached by an appropriate structure, but in the case of the illustration, it is as follows. That is, 6a to 6d are iron core tightening fittings, the transformer 2 is supported by the bottom plate 1a of the container 1 through the iron core tightening fittings 6a, and the transformer 3 is supported by the support metal 7 to cover the lid plate 1 of the container.
Suspend with b. Further, the transformer 2 is provided with an iron core tightening fitting 6b, and the transformer 3 is also provided with a heat shield plate 4 previously attached to the container side wall 1c with a fixed metal 8 so as to prevent steadying. Thus, the heat shield plate 4 has a structure in which a too large force is not applied.

A reinforcing material (not shown) such as an iron plate is added to the heat shield plate 4 to give it sufficient mechanical strength, and it is fixed to the container side wall 1c by a fixed metal member 8 to block the upper and lower compartments. Also, the heat shield plate 4
Through holes 4a and 4b are provided in the through holes to penetrate the primary lead wire 9 and the secondary lead wire 10. However, this through hole 4
A and 4b are provided with appropriate gaps between the lead wires 9 and 10 to allow a small amount of insulating gas to flow therethrough, so that there is no possibility that a pressure difference will occur in the insulating gas in the upper and lower sections due to temperature changes. Reference numeral 11 is a primary L-shaped connector, and 12 is a secondary bushing.

FIG. 2 illustrates the final temperature rise value inside the container based on the actual measurement result when each constant load is applied to the transformers 2 and 3 in the above embodiment, and explains the temperature rise value lowering action according to the present invention. FIG.

Here, the vertical axis h is the height inside the container, h ₀ is the highest part in the container, h ₁ is the mounting height of the heat shield plate 4, and the horizontal axis T is the temperature rise value. As shown by the solid line, in the conventional case where the heat shield plate 4 is not provided, the temperature becomes high at T ₁ at the uppermost part in the container, and becomes considerably high near the transformer 3 at the upper part. Therefore, it is necessary to suppress the temperature rise of the winding by means such as reducing the current density of the winding.

On the other hand, in the case of the present invention shown by the broken line, the heat shield plate 4
Since the above is provided, the insulating gas heated by the transformer 2 in the lower section 5b stays in the upper section 5a as it is without moving. Therefore, the heat is effectively dissipated from the surface of the container lower section 5b without affecting the upper section 5a. That is, the heat is effectively dissipated from the surface of the lower section 5b of the container, which has been conventionally kept at a relatively low temperature and has not been effectively dissipated. Thus the upper section 5
Even in the vicinity of the upper part of a, the temperature rise value remains at T ₂ , and excellent cooling characteristics can be obtained.

In addition, although the above-mentioned embodiment explained the case where two transformers were provided in the container as the electric equipment at the top and bottom, the present invention is applied to the case where a plurality of electric equipment is accommodated at the top and bottom, and each electric equipment is The inside of the container can be partitioned horizontally to allow effective cooling. Also, for the amount of heat generated by the stored electrical equipment,
When the amount of heat released from the compartment is small, an appropriate gas flow path may be provided to allow the insulating gas in the compartment to flow to another compartment where the amount of heat generated by the stored electrical equipment is smaller than the amount of heat released, allowing efficient cooling as a whole. it can.

〔The invention's effect〕

As described above, by providing the heat shield plate according to the present invention to horizontally partition the inside of the container for each electric device, and shutting down the vertical flow of the insulating gas, the temperature of the insulating gas is
As in the past, the upper part can be averaged and lowered without the risk of becoming particularly hot, and it is possible to increase the current density for the transformer windings and the magnetic flux density for the iron core, making the device compact. It is possible to reduce the weight and the price.

[Brief description of drawings]

1 (a) is a front sectional view showing an embodiment of the present invention, FIG. 1 (b) is a side sectional view, and FIG. 2 is a curve diagram for explaining a decrease in temperature rise value inside a container according to the present invention. is there. 1 ... Sealed container, 2, 3 ... Transformer, 4 ... Heat shield plate.

Claims (1)

[Claims] 1. A self-cooling gas insulation device comprising an electric device which is housed in a container filled with an insulating gas and dissipates heat from the surface of the container through the insulating gas, the sealed container being filled with the insulating gas, and the sealed container. A plurality of electric devices provided inside and below, a heat shield plate that is installed in the sealed container, horizontally partitions the inside of the sealed container for each electric device, and blocks the flow of the insulating gas; and the heat shield plate Among the compartments partitioned by, the amount of heat generated by the stored electric equipment is larger than the amount of heat dissipated from the container surface of the compartment. A gas-insulated device, comprising: a flow passage that allows the heat to be dissipated from the container surface into a large area.