JPH01122306A - Gas-insulated switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention relates to a cubicle-type gas insulated switchgear filled with an insulating gas such as SF6 gas, and in particular to protection against interphase short circuits of busbars. This also relates to the structure of the bus bar chamber, which aims to improve the cooling effect.

(Prior Art) Conventionally, a cubicle-type gas insulated switchgear 1 filled with an insulating gas (hereinafter referred to as gas) such as SF6 gas has been equipped with a circuit breaker (not shown) as shown in FIGS. 6 and 7. A busbar chamber 3 is disposed above a circuit breaker chamber 2 which houses current transformers and other electrical equipment and which is sealed and filled with gas. This busbar chamber 3 has a bushing 4. The disconnector 5 and the bus bar 6 are housed together in three phases, and are hermetically sealed to fill with gas. In addition, FIG. 6 shows a state in which the gas insulated switchgear 1 of the same structure is arranged on three sides, and the end of the part of the bushing 4 extending to the circuit breaker 2 is connected to a connecting conductor (not shown) in the circuit breaker chamber 2. )It is connected to the. Further, on the front side of the breaker room 2 and the FFI line 3, a control room 7 is arranged to house meters, relays, other control equipment, a circuit breaker operating mechanism (none of which is shown), etc. .

(Problems to be Solved by the Invention) The bus bar seedling 3 of the gas insulated switchgear configured as described above has the following problems. That is, (1) As shown in Fig. 6, the bus bar 6 is housed in a gas-filled and sealed bus bar chamber 3, so heat dissipation is poor and it is not possible to respond quickly to changes (increases) in the bus bar current carrying capacity. , the bus bar width and the volume of the closed box are increased.

(2) As shown in Fig. 7, the busbar 6 is arranged in a three-phase cluster in the busbar chamber 3, which is sealed with gas, so if gas leaks, the insulation will deteriorate, resulting in a short circuit between the phases, which could be a serious problem. There is a risk that this could develop into a major disaster.

Therefore, the purpose of the present invention is to provide a gas-insulated switching system that prevents short circuits between phases of the busbars in the busbar chamber, which is sealed with gas, and increases the current carrying capacity of the busbars by forcibly cooling the gas in the busbar chamber. The goal is to provide equipment.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a gas-insulated switchgear in which a bus bar is supported and a bus bar chamber filled with insulating gas is disposed in the upper part. Each phase is isolated by a cylinder, a heat exchanger and a ventilation fan are provided at the end of the busbar room via a sealed box, and an insulating gas circulation path is provided inside and outside the insulating cylinder.

(Function) Even if the insulating gas in the busbar room leaks and the insulation deteriorates, each phase is isolated by the insulating cylinder, so short circuits between phases can be prevented.

In addition, when the ventilation fan is driven, the insulating gas in the bus bar chamber flows through the insulating cylinder and outside as a circulation path, so the bus bar is forcibly cooled, and the heat generated from the bus bar is radiated to the outside via a heat exchanger, and the electricity is turned on. Capacity can be increased.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, a gas insulated switchgear 10 includes a circuit breaker 11, a current transformer 12. A busbar chamber 14 is disposed above the circuit breaker chamber 2 that houses the cable head 13 and the like. This busbar chamber 14 is open only on both sides, but the other side is sealed and filled with gas, and the bushing 4. Disconnector 5. Since the busbar 6 and the insulating cylinder 15 are housed together in three phases, both sides (however, if multiple gas-insulated switchgear are installed side by side, the outside of the busbar chamber of the gas-insulated switchgear on both sides) On one side (side surface), a closed box 15a is provided, and a ventilation fan 16 is housed therein, and on the other side, a closed box 15b is provided, and a heat exchanger 17 is housed inside. Here, the closed box 15, 1
5b has an open side surface connected to the busbar chamber 14, and has a side surface connected to the busbar chamber 14.
Connect to 4 airtightly.

The above-mentioned insulating tube 15 is cylindrical as shown in FIG. 4, and is supported by an insulator at an appropriate position in the longitudinal direction in the closed box of the busbar chamber 14, as shown in FIG. The shape when viewed from the side has a gap with the bus bar 6, and the length is determined for each phase and for each unit board of the gas insulated switchgear 10. Therefore, a small-diameter part (spigot part) or a flange part is provided at the longitudinal end part in order to enable connection with other adjacent parts, and this can be applied when the gas-insulated switchgear 10 is arranged side by side. do it like this. Note that the bus bar 6 is connected to the insulating tube 1
4 with an insulator, and connected to the adjacent one with bolts in the same way as before.

Further, the ventilation fan 16 has a discharge side open into the sealed box 15a, a suction side connected to the insulating tube 15 via a wind guide 16a made of an insulating material, and an outlet side connected to the insulating tube 15 through a wind guide 16a made of an insulating material (not shown). It is connected to the insulating cylinder 15 via.

Note that FIGS. 1 and 3 show the gas insulated switchgear 10 in three
In this case, each bus bar room 14. Each of the busbars 6 is connected to an adjacent one, and the leftmost busbar chamber 14 is airtightly connected to the sealed box 15a, and the rightmost busbar chamber 14 is connected to the sealed box 1.
Connect to 5b.

Next, the operation of the gas insulated switchgear configured as described above will be described in a case where the panel structure is arranged side by side.

When the ventilation fan 16 is driven, the gas inside the insulating tube 15 is sucked, so that the gas cooled by the heat exchanger 17 flows inside the insulating tube 15 as shown by the arrow 18a in FIG. Cooling. The gas whose temperature has increased by cooling the bus bar 6 is discharged from the ventilation fan 17 into the closed box 15a, flows inside the bus bar chamber 14 as shown by the arrow 18b in FIG.
b, and from there returns to the heat exchanger 17. In this way, the gas is forced to circulate, cooling the bus bar 6 and radiating the heat absorbed at this time to the outside via the heat exchanger 17.

Therefore, according to the above embodiment, the following effects can be obtained. In other words, (1) Each phase of the three-phase bus is isolated by an insulating cylinder with a gap, so even if there is a gas leak or the like and the insulation deteriorates,
Phase-to-phase short circuits can be prevented.

(2) By forcedly cooling the bus bar, the current carrying capacity of the bus bar can be increased.

(3) Due to the cooling effect of the bus bar, it is possible to respond to changes in the current carrying capacity of the bus bar, allowing standardization of gas-insulated switchgear.

Note that the present invention is not limited to the above-described embodiments, and can be implemented in various modifications.

That is, as shown in FIG. 5, the ventilation fan 16 has its suction side open into the closed box 15a, its discharge side connected to the insulating tube 15 via a wind guide 16b made of an insulating material, and the heat exchanger 17 1. The outlet side is opened into the sealed box 15b, and the inlet side is connected to the insulating tube 15 via a wind guide made of an insulating material (not shown). In this configuration, when the ventilation fan 16 is driven, gas within the busbar chamber 14 is sucked and discharged into the insulating cylinder 15 . That is, the gas cooled by the heat exchanger 17 flows inside the busbar box 14 as shown by the arrow 19a in the same figure, and the gas cooled by the ventilation fan 1
6 and is discharged into the insulating cylinder 15, as indicated by the arrow 1 in the figure.
As shown by 9b, the heat flows inside the insulating tube 15, cools the bus bar 6, and radiates the absorbed heat to the outside via the heat exchanger 17.

Alternatively, the ventilation fan 16 and the heat exchanger 17 may be housed in the same box, and the cooled gas may be allowed to flow inside the insulating cylinder 15 to cool the bus bar 6.

[Effects of the Invention] Since the present invention is configured as described above, even if there is a gas leak and the insulation of the busbar chamber deteriorates, each busbar is isolated by an insulating tube with a gap. , phase-to-phase short circuits of the busbars can be prevented, and current carrying capacity is increased by forced cooling of the busbars, allowing standardization of gas-insulated switchgear.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the configuration of essential parts of an embodiment of the present invention;
FIG. 2 is a side view of an embodiment of the present invention, FIG. 3 is a plan view of FIG. 1, FIG. 4 is a perspective view showing an insulating cylinder of an embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view showing the configuration of a bus bar chamber of a conventional gas-insulated switchgear; FIG. 7 is a partial side view of the conventional gas-insulated switchgear. . 2... Breaker room 6... Bus bar 14... Bus bar room 15... Insulating tube 16... Ventilation fan 17... Heat exchanger agent Patent attorney Noriyuki Chika Kenji Daishimaru Kendai Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Chopsticks Figure 6 Figure 7

Claims (1)

[Claims] In a gas-insulated switchgear that supports a busbar and has a busbar chamber filled with insulating gas at the top, each phase is isolated by an insulating cylinder with a gap in the busbar, and a sealed box is provided at the end of the busbar chamber. A gas insulated switchgear characterized in that a heat exchanger and a ventilation fan are provided through the insulating cylinder, and the inside and outside of the insulating cylinder are used as a circulation path for the insulating gas.