JP2001112129A - Gas-inslated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain temperature rise in the upper part of an apparatus tank which is located in the vicinity of a breaker. SOLUTION: In this gas-insulated switchgear, bus line tanks 4a, 4b accommodating a bus line 7 and a bus line 8 are installed on an apparatus tank 3 having a breaker 26, and the bus lines 7, 8 are connected with the breaker 26 via penetrating main circuit conductor 11 and connection main circuit conductor 11a. A coating film is formed on the surface of the connection main circuit conductor 11a by using painting, oxidation treatment, etc., which are high in emissivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear, and relates to a gas insulated switchgear having improved heat radiation characteristics of an equipment tank.

[0002]

2. Description of the Related Art The structure of a conventional gas insulated switchgear is shown in FIG. As shown in the figure, a housing 2 having doors 1a and 1b on the front surface on the left side in the figure and an opening on the back surface is provided,
Inside the housing 2 is an equipment tank 3 and a pair of busbar tanks 4.
a and 4b are accommodated.

In the bus tanks 4a and 4b, three-phase instep buses 7 and 8 buses 8 are hermetically sealed in the bus tanks 4a and 4b in directions perpendicular to the plane of the paper via three-phase insulating spacers 5 and 6. Penetrates. The instep bus 7 and the second bus 8 are guided into the equipment tank 3 via a disconnector 9 as a switch, a main circuit conductor 10, and a penetrating main circuit conductor 11. On the other hand, equipment tank 3
And a pair of busbar tanks 4a and 4b are separated from each other by a three-phase insulating spacer 14 that closes through holes 4c and 4d that penetrate through the busbar tanks 4a and 4b and the equipment tank 3. Penetrates hermetically. A connection main circuit conductor 11a is fixedly provided in an upper portion inside the equipment tank 3, and lower ends of a pair of through main circuit conductors 11 are detachably connected to two places of the connection main circuit conductor 11a.

A main circuit conductor 22,
23 are attached. Then, inside the equipment tank 3, a circuit breaker 26 and grounding switches 27, 28, 30
And a disconnector 29 constituting a switch and a lightning arrester 31 are accommodated. In the present invention, a vacuum interrupter that does not generate decomposition gas is used as the circuit breaker 26. These devices are detachably attached to the device tank 3.

[0005] Behind the equipment tank 3 is a cable housing 46.
The cable head 48 is attached to the end of the cable 47 housed in the cable housing 46. The cable head 48 is connected to the main circuit conductor 22.
Is connected to the upper end.

[0006]

However, the heat generated at the contact portions of the pair of electrodes and the connection portions of the conductors inside the circuit breaker heats the insulating gas in the equipment tank, and the increased temperature of the insulating gas is applied to the equipment tank. Gather at the top of. Since the bus tank is adjacent above the equipment tank, the heat radiation efficiency is low, and the temperature of the upper part of the equipment tank rises.

[0007] A connection main circuit conductor for connecting the circuit breaker to the instep bus and the auxiliary bus is arranged on the upper part of the equipment tank, and the heat radiation efficiency of the connection main circuit conductor is low. In this part, the arc extinguishing chamber of the circuit breaker, which is the heat source, is located, and the insulating gas that has been heated and rises is collected at the upper part of the equipment tank, where a vicious cycle is generated.

Accordingly, an object of the present invention is to provide a gas insulated switchgear which solves the above problem.

[0009]

According to a first aspect of the present invention, there is provided a gas-insulated switchgear having a bus tank accommodating a bus above an equipment tank accommodating a circuit breaker. In the gas-insulated switchgear that connects the circuit breaker and the bus via a main circuit conductor, a surface of the main circuit conductor located at an upper part of the equipment tank, and at least an upper part of an inner surface of the equipment tank, The coating of the gas-insulated switchgear according to claim 2 is characterized in that a coating that improves the emissivity of heat is formed on one or both of the coatings. The gas-insulated switchgear according to claim 3 is characterized in that the coating is formed by sticking a sheet-like member that has been painted or oxidized.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Heat radiation from a main circuit conductor housed in an equipment tank is performed in three forms: heat conduction, convection, and radiation. The higher the emissivity on the surface of the main circuit conductor and the inner surface of the equipment tank, the more efficient the radiation of the three forms. The present invention suppresses a rise in temperature inside an equipment tank by increasing the amount of heat per unit time that moves from the main circuit conductor to the equipment tank by radiation.

Generally, a solid at a temperature t _{1 is} converted into a solid at a temperature t ₂ (t ₁
> T ₂ ), the amount of heat Q transferred by radiation from the solid to the housing when housed in the housing is given by:

Q = σA₁(T₁ ^Four-T_Two ^Four) / ｛1 / ε₁+
(A₁/ A_Two) (1 / ε_Two-1)｝ where A₁, A_TwoIs the solid, the surface area of the housing, ε₁, Ε_TwoIs solid
The emissivity of the body and the housing, σ, is the Boltzmann constant. 0 <ε
₁, Ε_Two<1, so to maximize Q, ε ₁, Ε_TwoTo
You just need to increase it. Therefore, the present invention relates to an outer surface of a main circuit conductor.
And radiation by treating the inner surface of the equipment tank
Rate ε₁, Ε_TwoTo increase the radiation efficiency by radiation.
It has been up.

An embodiment of the gas insulated switchgear according to the present invention will be described below. Since the first to third embodiments are obtained by improving a part of the conventional gas insulated switchgear, the same parts as those in the related art are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described.

(A) Embodiment 1 FIG. 1 shows Embodiment 1 of a gas-insulated switchgear according to the present invention.

In this embodiment, a coating is formed on the surfaces of the connecting main circuit conductor 11a and a part of the penetrating main circuit conductor 11 located on the upper part of the equipment tank 3 as indicated by dots in FIG. It is. In order to form a coating, a coating or oxidation treatment is applied to improve the emissivity of heat. The oxidation treatment is performed because it is known that the heat treatment improves the emissivity of heat.

Next, the operation of the gas insulated switchgear will be described. The connection main circuit conductor 11 is generated by heat generated by the circuit breaker 26 and the like.
When the temperature of a rises, the coating is formed on the surface of the connection main circuit conductor 11a, so that the heat emissivity is higher than before, and the heat is radiated to the surroundings at a higher speed than before. Then, the radiated heat is transmitted to the equipment tank 3 and the like, and is released directly to the atmosphere from the equipment tank 3 or to the atmosphere via the busbar tanks 4a and 4b.

(B) Embodiment 2 Embodiment 2 will be described with reference to FIG.

In this embodiment, as shown by a two-dot chain line in FIG. 2, the inner surface of the equipment tank 3 is coated or oxidized to improve the emissivity of heat. As the emissivity increases, the efficiency of receiving the radiant heat also increases, and the heat radiated by the connection main circuit conductor 11a is efficiently absorbed.

Next, the operation of the gas insulated switchgear will be described. The breaker 26 and the like generate heat and the connection main circuit conductor 11a
When the temperature rises, heat is radiated from the surface of the connection main circuit conductor 11a. This radiated heat is efficiently absorbed from the inner peripheral surface of the equipment tank 3. The absorbed heat is released directly from the outer peripheral surface of the equipment tank 3 to the atmosphere, or is released to the atmosphere via the busbar tanks 4a and 4b.

The inner surface of the equipment tank 3 is painted, for example.
It may be applied only to the upper part of the equipment tank 3 having a large number of heat generating parts without being applied to the entire surface.

(C) Third Embodiment Finally, a third embodiment will be described. This embodiment is a combination of the first and second embodiments. That is, the coating is formed on both the surface of the connection main circuit conductor 11 a and the like and the inner surface of the equipment tank 3.

In such a gas insulated switchgear, not only the emissivity from the connection main circuit conductor 11a but also the heat absorption rate of the equipment tank 3 is larger than before. Therefore, the efficiency of heat radiation inside the equipment tank 3 is higher than in the first and second embodiments.

In the first to third embodiments, the coating is formed by painting or oxidizing treatment. However, the coating or oxidizing treatment is applied to the surface, and a tape having excellent heat conductivity can be adhered to the film. May be attached with an adhesive.

[0024]

As can be seen from the above description, claim 1
According to the gas-insulated switchgear according to any one of (1) to (3), a coating that improves the emissivity of heat is formed on one or both of the surface of the main circuit conductor and the inner surface of the equipment tank. To improve the efficiency of heat radiation of the equipment, improve the efficiency of absorption of radiant heat by the inner surface of the equipment tank,
Alternatively, the efficiency of both can be improved. Therefore, it is possible to suppress an increase in the temperature of the upper part in the equipment tank.

[Brief description of the drawings]

FIG. 1 is a first embodiment of a gas-insulated switchgear according to the present invention.
FIG.

FIG. 2 is a second embodiment of the gas-insulated switchgear according to the present invention.
FIG.

FIG. 3 is a sectional view showing a conventional gas insulated switchgear.

[Explanation of symbols]

 3 ... Equipment tanks 4a, 4b ... Bus tank 7 ... Inner bus 8 ... Oto bus 11 ... Priming main circuit conductor 11a ... Connection main circuit conductor 26 ... Circuit breaker

Continued on the front page (72) Inventor Hidemitsu Takebuchi 2-1-1-17 Osaki, Shinagawa-ku, Tokyo F-term in Meidensha Co., Ltd. 5G016 AA04 CG17 5G017 AA21 AA22 BB20 JJ01 5G028 GG09

Claims (3)

[Claims] 1. A gas-insulated switchgear in which a bus tank for accommodating a bus is provided on an equipment tank for accommodating a circuit breaker and the like and the circuit breaker and the bus are connected via a main circuit conductor. A gas having a heat-emissivity coating formed on one or both of a surface of the main circuit conductor located at an upper part and at least an upper part of an inner surface of the equipment tank. Insulated switchgear. 2. The gas insulated switchgear according to claim 1, wherein the coating is formed by painting or oxidation. 3. The gas insulated switchgear according to claim 1, wherein the coating is formed by attaching a painted or oxidized sheet member.