JPS63114016A - 3-phase/1 batch tank type gas breaker - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a three-phase single tank type gas circuit breaker in which the cut-off parts for each of the three phases are housed in a sealed tank. .

(Prior Art) A three-phase single tank type gas circuit breaker is constructed by arranging independent circuit breakers for each phase in a common grounded hermetic tank. Conventional three-phase tank-type gas circuit breakers have relatively low voltages and are used in models with moderate or lower rated breaking currents.

Therefore, there was no need to strengthen the insulation between the two and the ground so much. Such a three-phase single tank type gas circuit breaker is described in Japanese Unexamined Patent Publication No. 114231/1983.

Figures 3 and 4 show conventional examples of this type of three-phase single tank type gas circuit breaker, in which 1 houses a circuit breaker 50 for each of the three phases, U-phase, ■-phase, and W-phase. It is a grounded tank and is supported by a pedestal 1al. Reference numeral 15 denotes an operating mechanism attached to this pedestal 1a, and the operating force of this operating mechanism 15 is configured to be transmitted to the cutoff portion of each phase via a link mechanism.

The cutoff parts 50 for each of the three phases are installed on the upper part of the pedestal 1a, housed inside the grounded tank 1, and arranged at intervals of approximately 120 degrees. The configuration of the cutoff section 50 of each phase is almost the same, but for example, when explaining the cutoff section 50W of the W phase, 2W
4W is a fixed contact, and 4W is a movable contact that faces toward and away from this, and these surface contacts 2W and 4W form a pair of W-phase contacts that can move toward and away from each other. 3W is an insulating nozzle provided concentrically surrounding the movable contact 4W and is attached to the puffer cylinder 51W. 52W is puffer cylinder 5
It is a fixed piston fitted with 1W. A shaft connected to the puffer cylinder 51W is connected to a link mechanism and an operation mechanism 15 via an insulated operation rod 6W. 13
W is an insulating cylinder that houses the W-phase interrupting part, and serves as an inter-electrode support that fixes the fixed contact 2w at the upper part and supports one end of the fixed piston 52W at the lower part, and also serves as an insulator between the phases. is also functioning. The entire fixed part is a pedestal 1a.
It is attached to the upper part of the hollow supporting insulating cylinder 7W.

10W is an auxiliary container on the exhaust side provided at the upper part of the insulating cylinder 13W on the opposite side of the fixed contact 2W, 11W is an exhaust port facing in the axial direction, and W and 9W are lead-out conductors drawn out from the cutoff part 50W.

FIG. 4 is a cross-sectional view taken along the line B--B in FIG. 3, and the blocking parts 50U, 50V, and 50W for each phase are arranged in the grounded tank 1 at approximately 120 degree intervals.

By the way, this type of three-phase single tank type gas circuit breaker has conventionally been employed in models and classes whose rated voltage and rated current are not so large.

On the other hand, recent gas-insulated switchgears used in ultra-high voltage, large-capacity substations, switchyards, etc. have three-phase, one-phase main busbars, branch busbars, etc.
There is a trend to configure gas circuit breakers in the bulk tank type, and gas circuit breakers have also started to be constructed in the three-phase single tank type.

When the three-phase single tank type gas circuit breaker is applied to an ultra-high-pressure large-capacity vessel, it prevents the hot gas caused by the arc generated in each phase from flowing between the phases and ground, causing short circuits between phases and ground faults. It is necessary. In order to prevent phase-to-phase short circuits and ground faults, it is necessary to increase the distance between the phases and the ground, but since the tank diameter increases and the circuit breaker becomes larger, this method is not recommended when applied to gas-insulated switchgear. ,
There was a drawback that it adversely affected the downsizing of the entire device.

(Problems to be Solved by the Invention) By the way, in the high voltage, large capacity three-phase single tank type circuit breaker as described above, after the large current is cut off, the hot gas caused by the arc is transferred to the extinguisher supported by the insulating tube. It is concentrated not near the arc chamber but near the exhaust port 11 on the fixed electrode side. Due to the hot gas concentrated in this area, especially when trying to downsize the tank diameter, the distance between phases and the distance to ground will be shortened, which will adversely affect the insulation strength between phases and ground, resulting in short circuits between phases and ground faults. Sometimes.

The present invention was made in order to eliminate the drawbacks of the prior art as described above, and its purpose is to prevent phase-to-phase short circuits caused by the hot gas of the arc, maintain sufficient interrupting performance, and provide high-voltage An object of the present invention is to provide a three-phase single tank type circuit breaker applicable to current interruption.

[Structure of the invention]

(Means for Solving the Problems) The three-phase single tank type circuit breaker of the present invention has hot gas exhaust ports on the fixed electrode side directed in different directions perpendicular to the axial direction, and The gas exhaust ports for each phase were arranged at different heights in the axial direction.

(Function) With the structure of the present invention, when a three-phase short circuit occurs in a three-phase tank type circuit breaker, a three-phase and ground fault will occur due to the mixture of hot gas generated in the three phases. It is possible to prevent this.

〔Example〕

(Configuration of Embodiment) An embodiment of the present invention as described above will be specifically described with reference to FIG. 1 and FIG. 2. Note that the same members as those of the conventional gas circuit breaker shown in FIG. 1 will be described with the same reference numerals.

In this embodiment, in addition to the movable gutter structure of the conventional embodiment, as shown in Fig. 1, an exhaust port +2U on the fixed electrode side,
1.2V and 12W are arranged so that they are not at the same height in the axial direction, and are provided in different directions. That is, in Fig. 2, if the tall phase is U phase, then U
The exhaust direction of the phase is set in the axial direction, and the exhaust port 12U is provided on the opposite side of the lead-out conductor 8U, and the exhaust port 2U is at the same height as the position of the exhaust ports 12V and 12W of other phases. Not in. The exhaust port 1.2 V of other phases, for example, V phase, is
It is in the direction of the lead-out conductor 8U of that phase. Furthermore, the exhaust port 12V is provided at a lower position, different from the height of the U phase. The exhaust port 12W of the W phase is located in the direction of the lead conductor 8W of that phase like the ■phase, and its height is lower than that of the ■phase.

(Operation of the Embodiment) The operation of the present embodiment having the above-mentioned configuration is completely the same as that of the conventional example shown in FIGS. 3 and 4 described above, and therefore a description thereof will be omitted.

In a three-phase tank type circuit breaker, when an arc occurs between the electrodes of three phases and is interrupted, most of the hot gas caused by the arc is exhausted to the fixed electrode side.

However, the exhaust ports for exhausting the hot gas are located at different positions in the axial direction, in different directions, and at different heights for each phase. Therefore, the hot gas generated in each phase is blown out in different directions and positions, so that the local concentration of hot gas as described in the prior art section does not occur.

〔Effect of the invention〕

The effects of this embodiment are as follows. When an interruption such as a three-phase short circuit occurs, the direction and position of the hot gas that is generated is different for each phase, so the hot gas is not concentrated locally and is Since the insulation between the phases is not weakened locally, short circuits between the phases are less likely to occur. Furthermore, since hot gas does not blow out in the direction of the tank between the ground and the ground, even if voltage is applied between the ground and the ground after the current is cut off, the insulation strength does not weaken locally, so it is thought that ground faults are unlikely to occur. . Therefore, with such a structure, even if an interruption such as a three-phase short circuit occurs, the hot gas will not cause a three-phase short circuit between the interruption parts and a ground fault phenomenon between the earth and the interruption part. It is possible to provide a highly reliable high voltage three-phase single tank type circuit breaker.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of the inside of the tank of the three-phase single tank type circuit breaker of the present invention, and Figure 1 (X) is the
Figure 1 (Y) is a view seen from the Y direction in Figure 1, Figure 2 is a view seen from the Y direction of the present invention, Figure 3 is a view seen from the Y direction. FIG. 4 is a cross-sectional view taken along line BB in FIG. 3. FIG. 1... Grounded tank 1a... Frame 2 (U, V
, W)...Fixed contact 3 (U, V, W)...Insulated nozzle 4 (U, V, W)...Movable contact 6 (U, V, W)...Insulated operating rod (U, V, W
)... Support insulating cylinder 8.9 (U, V, W)... Output conductor 1.0 (U, V
, W)...Exhaust container 11 (U, V, W), axial exhaust port 12 (U, V, W)...Exhaust port 13 (U, V, W)...Insulating tube 1.5 (U, V, W)... Operating mechanism 50 (U, V, W)... Arc extinguishing chamber 51 (U, V, W)... Puffer cylinder 51 (U
, V, W)...Puffer Piston Agent Patent Attorney Nori Ken Chika Yudo Hirofumi Mitsumata 15 Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] A container filled with arc-extinguishing gas has a fixed contact element and a movable contact element that can be moved in and out, and a puffer chamber consisting of a puffer piston and a puffer cylinder attached to and driven by an operating rod is compressed. , the arc-extinguishing gas in the puffer chamber is compressed and guided to the nozzle part, and is blown onto the arc generated between the fixed contact and the movable contact as the circuit breaker breaks, thereby cooling the arc. In a three-phase single-tank type gas circuit breaker, in which the arc extinguishing chamber for extinguishing the arc is arranged in a grounded tank at potential to the ground filled with the arc-extinguishing gas, the heat source provided on the fixed contact side The exhaust ports for exhausting gas are arranged at different heights in the direction perpendicular to the axial direction, and the blowing direction for two phases is on the drawer conductor side, and the other phase is away from the drawer conductor side. A 3-phase tank type circuit breaker characterized by an opening on the opposite side.