JPS6155207B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a puff-type gas cylinder breaker which compresses arc-extinguishing gas by a piston and cylinder device during a tripping operation, and particularly relates to a gas cylinder breaker which compresses arc-extinguishing gas by a piston and cylinder device during a tripping operation. This relates to a puffer-type gas shield and disconnector with improved withstand voltage characteristics.

In recent years, with the increase in high voltage and capacity in power grids, the rated current that should be passed by breakers and the short-circuit current that should be broken have increased rapidly, and the voltage per point has also tended to increase. be. Therefore, in order to meet these demands, it is desired that the arc energy processing capacity and insulation recovery power imposed on gas insulators and disconnectors be dramatically increased.

On the other hand, in puffer-type gas shields and disconnectors, a configuration as shown in FIG. 1 has conventionally been adopted as a means for increasing the rated current. That is, a breaker has been developed that includes a fixed arc contact 3, a movable arc contact 6, a fixed main contact 1 for energization, and a movable main contact 5 for energization. The upper half of FIG. 1 shows the applied state, and the lower half shows the cut-off state. However, in such a puffer type or disconnector, during the cutting operation and after the current is cut off, the high temperature gas exposed to the arc is energized by the insulating nozzle 4 as shown by the arrow in FIG. The gas is carried to the vicinity of the stationary contact 1 and the movable contact 5, and the dielectric strength of the periphery of the energizing contact decreases due to the high temperature of the gas and the decrease in density. Nao 7
8 is a movable cylinder, and 8 is a fixed piston.

An object of the present invention is to move the part downstream of the throat part of the insulating nozzle to the downstream side, as viewed from the gas flow direction, in order to prevent high-temperature gas exposed to the arc from being directly carried to the area around the current-carrying contact. It is an object of the present invention to provide a puffer-type gas shield breaker which has improved withstand voltage characteristics after the shield ruptures by being stretched longer in the direction of the shield.

An embodiment of the invention is shown in FIGS. 2 and 3.
FIG. 2 shows a closed state, and FIG. 3 shows a closed state. 1 is a fixed-side main contact for energization when the cutter is turned on, and together with the movable-side main contact for energization 5, constitutes a main contact part. 3 is the fixed side arc contact,
Together with the movable arc contactor 6, it constitutes an arc contact portion. These contacts are
The main energizing contacts 1 and 5 open earlier than the arcing contacts 3 and 6, and in the closing operation, the arcing contacts 3 and 6 close earlier than the energizing contacts 1 and 5. A movable cylinder 7 has the main contact 5 and the arc contact 6 fixed therein. A fixed piston 8 is provided within the movable cylinder 7 to form a gas chamber. Further, an insulating nozzle 4 is fixed to the movable cylinder 7 so as to surround the arc contacts 3 and 6. The movable cylinder 7 compresses the arc-extinguishing gas in its own cylinder chamber during the cutting operation, and blows the gas from the hole 70 of the cylinder 7 through the insulated nozzle 4 to the arc generated between the arc contacts 3 and 6. Extinguish the arc by attaching it. By the way, the shape of the insulating nozzle 4 has a throat part 9 protruding from the middle part of the gas flow path, and the part downstream of the throat part 9 is extended further in the downstream direction with respect to the gas flow direction. In the tripped state where the shearing operation ends, the tip a of the energizing fixed side main contact and the downstream tip b of the insulating nozzle are arranged so as to overlap by L in the central axis direction, as shown in Fig. 3. let Note that the gas flow path of the insulating nozzle 4 is wide open on the gas downstream side of the throat portion 9 provided in the insulating nozzle 4.

The puffer-type gas shield disconnector embodying the present invention as described above has an insulating nozzle and a current-carrying fixed contact overlapping each other in the central axis direction during the shielding operation and in the tripped state at the end of the shielding operation. The high temperature gas 6 exposed to the arc was
As shown by the arrow in the figure, the flow is shrunk by the insulating nozzle and is no longer carried directly to the periphery of the energizing contact device, increasing the dielectric strength after the shrunk. As a result, its cutting ability can be increased.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional puffer-type gas shield, showing the upper half when it is turned on and the lower half when it is closed. FIG. 2 is a cross-sectional view showing an embodiment of a gas shutoff switch in a closed state (FIG. 2) and a tripped state (FIG. 3). DESCRIPTION OF SYMBOLS 1... Fixed-side contact for energization, 3... Fixed-side arc contact, 4... Movable-side insulated nozzle, 5... Movable-side contact for energization, 6... Movable-side arc contact, 7
...Movable cylinder, 8...Fixed piston, 9...
Throat part.

Claims (1)

[Claims] 1 Equipped with an energizing contact part and an arc contact part, the energizing contact part is opened before the arc contact part is released, and the gas in the movable cylinder is compressed by a fixed piston when the arc contact part is released. and the movable cylinder is provided with an insulating nozzle so as to surround the arc contacting part, and the energizing contact part is arranged outside the insulating nozzle, The insulating nozzle is characterized in that a downstream end of the insulating nozzle overlaps a tip of a current-carrying fixed contact in the direction of the central axis when the gas disconnector is completely tripped.