JPH0479114A - Multiphase separation type gas insulating electric equipment - Google Patents

Abstract

PURPOSE:To efficiently vaporize a liquefied gas without subjecting each tank to any working by aligning tanks in such a manner that each of the tanks is slanted in the vertical direction, and communicating the lower portions of the tanks with each other using piping, and heating part of the piping using a heating means. CONSTITUTION:Tanks 12 are aligned in such a manner as each being slanted in the vertical direction and the lower portions 14 of the tanks which are lowered by the slanting are communicated with each other by piping 15 and also part of the piping 15 is heated by a heating means 17. A liquefied gas 18 condensed into dew is collected in the lower portion 14 of each tank and is further allowed to flow into the piping and is heated by the heating means 17 via a fin 16 and warms and vaporizes and is converted into air bubbles inside the piping and returns to the inside of each tank 12. In this case, even with a pressure difference caused when the amount of the gas which returns to the inside of each tank 12 via the piping 15 becomes nonuniform, the liquefied gas in both piping 15 is pushed out into that tank 12 where pressure is low, so that gas pressures in the tanks 12 balance each other. Thereby the liquefied gas is efficiently vaporized without subjecting each of the expensive tanks to any working.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the improvement of multi-phase separated gas insulated electrical equipment used particularly in cold regions, and in particular to the improvement of gas-insulated electrical equipment that liquefies at low temperatures. The present invention relates to multi-phase separated gas insulated electrical equipment that can be

[Conventional technology]

SF gas is an inert gas that has superior properties in insulation, arc resistance, and heat resistance compared to other gases, and is used in electrical equipment that uses it as an insulation or cooling medium, and as an arc extinguishing medium. Gas circuit breakers became widely used. On the other hand, when using electrical equipment such as transformers and switches in cold regions, it is necessary to withstand the low temperatures (for example -40°C) during the severe winter season and operate normally.
6 gases liquefy at low temperatures, leading to a drop in gas pressure inside the equipment, resulting in a lack of insulation performance and arc extinguishing performance, so it is necessary to prevent this. Possible countermeasures include placing the entire equipment inside a building, covering the equipment tank with heat insulating material to prevent the ambient temperature from dropping, and installing heaters in all or part of the equipment. .

Figures 4 and 5 are a front view and a side sectional view of this conventional gas insulated electrical equipment disclosed in Japanese Utility Model Publication No. 62-9630. In the figure, (1) is a breaker provided for each phase, (2) is a tank that accommodates each breaker (1), and β) is the SF6 gas filled in this tank (2). , (2) is a recess formed at the bottom of each tank (2) to store the liquefied SF6 gas G), (to) is a pipe that communicates between each tank (3), and (6) is a recess formed at the bottom of each tank (3) to store the liquefied SF6 gas G). ) has a sloped structure so that the liquefied gas (7) can easily collect in the recess. (5) is the power supply (
A heater (9) is energized to locally heat each recess (4), and (10) is a housing for controlling the circuit breaker, which is equipped with an operating device (11) inside.

Next, we will discuss the effect. During severe winters in cold regions, when the gas temperature drops to the point where the SF6 gas B) filled in the tank begins to liquefy, the SF6 gas β)
is a liquefied tank! Condensation forms on the inner wall of 21.

This condensed liquefied gas port accumulates at the bottom (6) of the tank, flows along the slope, and accumulates in the recess (4).

Then, the liquefied gas port accumulated in this recess (4) is locally heated by a heater (8, warmed and vaporized again to become SF6 gas (3). Also, each tank (2) is connected to a pipe (
51, the tank (2) is locally cooled, and even if a certain phase is liquefied to a large extent, the gas pressure in each phase is kept uniform.

Generally, gas circuit breakers are designed to operate without any problem even if the gas pressure drops to about 10% of the normal level, so as mentioned above, a small amount of liquefied gas will not vaporize. Even if it remains, the gas breaker can still operate normally.

[Problem to be solved by the invention]

Conventional multi-phase separation type gas insulated electrical equipment is configured as described above, so in order to vaporize the liquefied gas (2) formed by dew condensation of the SF6 gas (3), the bottom of the tank (2) (
6), it is necessary to form an inclination or a recess (4), which poses a problem in that the tank, which is normally expensive, becomes increasingly expensive.

This invention was made to solve the above-mentioned problems, and provides a multi-phase separated gas insulated electric device that can efficiently vaporize liquefied gas without making any modifications to expensive tanks. The purpose is to obtain.

[Means to solve the problem]

In the multi-phase separated gas insulated electrical equipment according to the present invention, tanks are arranged side by side in a vertically inclined manner, and the lower part of each tank on the lower side due to this inclination is connected by a pipe, and the middle of this pipe is heated. It is heated by means.

[For production]

The piping in this invention is heated by the heating means to vaporize the liquefied gas accumulated inside and return it to the tank.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a multiphase separation type gas insulated electric device according to an embodiment of the present invention will be explained based on the drawings. FIG. 1 and FIG. 2 are a partially sectional front view and a side view, respectively.

In the figure, a breaker (1), SF6 gas (3), a breaker control housing (10), and an operating device (11)
is the same as the conventional one. (12) accommodates the circuit breaker installed in each phase, and the installation surface (13
), the tank is tilted up and down by θ with respect to (
14) is the lower part of the tank on the side lowered by the slope, (1
5) is a pipe connecting the lower part of each tank (14), (1
6) is a fin provided on the surface of the pipe (15) to improve heat exchange between the inside of the pipe and the outside; (17) is a heating means such as a heater for heating the pipe; (18)
is the liquefied gas accumulated in the lower part of the tank (14).

Next, the operation of one embodiment of the present invention configured as described above will be described.

First, as in the conventional case, when the temperature of the SF and gas (3) in the tank (12) decreases to a temperature at which the SF and gas begin to liquefy, they liquefy and condense on the inner wall of the tank (12).

This condensed liquefied gas (18) accumulates at the bottom of the tank (14) because the tank (12) is inclined. This liquefied gas (18) further flows into the pipe, and the heating means (17)
It is well heated through the fins (16), is heated and vaporized, becomes bubbles in the piping, and returns to each tank (12).
Go back inside.

At this time, if the amount of SF6 gas returning into each tank (12) via the piping (15) becomes uneven, each tank (12)
), but if the height difference between both pipes (15) is not too large, the head pressure of liquefied SF and gas (specific gravity: about 1.5) will be small, so the pressure will be small. Even if a difference occurs, the liquefied SF and gas in both pipes (15) are pushed out into the tank (12) with lower pressure, and the gas is transferred to each tank (15).
12) Balance the gas pressure within.

Incidentally, when the difference in height between the two gas pipes (15) is 10 (2), the head pressure of the liquefied SF gas is approximately 0.015 atmospheres, which is extremely small.

In this way, according to the above-mentioned embodiment, the pipe (15) also serves as the pipe (5), which was conventionally provided to equalize the pressure inside each tank (1).
2), the liquefied gas (18) can be vaporized inexpensively and efficiently.

Incidentally, the tank (12) in the above embodiment is sloped in advance with different leg lengths, etc., but the slope can be made by inserting a shim (19) as shown in Fig. 3. This eliminates the complexity of having to set different leg lengths in advance. In addition, in the above embodiment, the pipe (15
) is provided with a fin (16), but the piping (15)
If the fins (16) are made sufficiently thick, the same effect can be expected even without the fins (16). Furthermore, in the above embodiment, a dedicated heater is provided as the heating means (17), but a space heater (not shown) is provided in the control housing (10) for the purpose of internal ventilation and prevention of condensation. ) is often provided, so if this space heater has sufficient capacity, it is possible to use it and omit the dedicated space heater.

〔Effect of the invention〕

As described above, according to the present invention, the tanks are arranged side by side in a vertically inclined manner, and the lower part of each tank on the side lowered by the inclination is connected by a pipe, and the middle of this pipe is heated by a heating means. This makes it possible to obtain a multi-phase separated gas insulated electric device that can efficiently vaporize liquefied gas without making any modifications to an expensive tank.

[Brief explanation of the drawing]

Section 1 and FIG. 2 are partially sectional front and side views respectively showing a multi-phase separated gas insulated electrical equipment according to one embodiment of the present invention, and FIG. Front view showing phase-separated gas insulated electrical equipment, No. 4
5 and 5 are a front view and a side sectional view, respectively, showing a conventional multi-phase separation type gas insulated electric device. In the figure, (12) is a tank, (14) is a lower part of the tank, (15) is a pipe, and (17) is a heating means. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Patent Attorney Oiwa
Masuo Figure 3

Claims (1)

[Claims] A plurality of tanks that house electric circuit sections of different phases in a gas atmosphere and are arranged in parallel vertically, and piping that communicates with the lower part of the tank on the side that is lowered by the slope of each tank, and this piping. A multi-phase separated gas insulated electric device characterized by being equipped with a heating means that heats the middle.