JPS6158935B2 - - Google Patents

Description

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

In recent years, with the increase in high voltage and capacity in power grids, the rated current that must be applied by disconnectors and the short-circuit current that must be disconnected have increased rapidly, and the voltage per point is also on the rise. . Therefore, in order to meet these demands, it is desired that the ability to handle the arc energy imposed on the gas insulator or disconnector and the insulation recovery power 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 on state, and the lower half shows the off state. However, in such a puffer type or disconnector, the high-temperature gas exposed to the arc during the cutting operation and after the cutting of the current is fixed for energization by the insulating nozzle 4 as shown by the arrow in Fig. 1. The gas is carried to the vicinity of the side contactor 1 and the movable main contactor 5, and the dielectric strength of the periphery of the current-carrying contactor decreases due to the high temperature of the gas or the decrease in density.
Note that 7 is a movable cylinder, and 8 is a fixed piston.

An object of the present invention is to provide insulation guides on the movable side member and the fixed side member to prevent high-temperature gas exposed to the arc from being directly carried around the current-carrying contact. An object of the present invention is to provide a puffer type gas shield and disconnector with improved voltage characteristics.

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 breaker is turned on, and together with the movable-side main contact for energization 5 constitutes a main contact part. Reference numeral 3 denotes a fixed arc contact, which together with the movable arc contact 6 constitutes an arc contact portion. These contacts are such that in the breaking operation, the current-carrying main contacts 1 and 5 open earlier than the arc contacts 3 and 6, and in the closing operation, the arc contacts 3 and 6 open the current-carrying contact 1 earlier than the current-carrying main contacts 1 and 6. Make the injection earlier than 5. A movable cylinder 7 has the main contact 5 and the arc contact 6 fixed therein. A fixed piston 8 is provided within this movable cylinder to form a gas chamber. Furthermore, an insulating nozzle 4 is provided in the movable cylinder 7 so as to surround the arc contacts 3 and 6.
is fixed. During the cutting operation, the movable cylinder 7 compresses the arc-extinguishing gas in its own cylinder chamber and passes it through the insulating nozzle 4 through the cylinder hole 70.
Gas is sprayed onto the arc generated between the arc contacts 3 and 6 to extinguish it. Reference numeral 2 denotes an insulating guide provided on the inner surface of the middle part of the fixed main contact 1 for current-carrying, which is placed outside the insulating nozzle 4, and is used together with the movable insulating nozzle 4 during its bending operation and when the current is This is to prevent high-temperature gas exposed to the arc from being carried around the energizing main contacts 1 and 5 after the energization. Therefore, the insulating nozzle 4
gas downstream end a and the free end b of the insulated guide 2
That is, they are arranged so that they overlap by l in the direction of the central axis, as shown in FIG. 3, at the end of the shearing operation.

When a shrunken command is given from the closed state shown in FIG. Then, after the current-carrying main contacts 1 and 5 are separated, the arc contacts 6 and 3 are separated, and an arc is generated. As shown in FIG. 3, the compressed gas is blown toward the arc through the flow path of the insulating nozzle 4 as shown by the arrows from the hole 70, and serves to extinguish the arc. As the arc is blown out, the gas becomes hot and flows around the arc contact 3, but the gas is transferred to the energizing main contact by the insulating nozzle 4 and the insulating guide 2 provided on the inner surface of the energizing fixed main contact 1. It is possible to prevent the liquid from flowing into the periphery of the children 1 and 5. Therefore, gas with reduced dielectric strength due to exposure to arc and high temperature and reduced density will not flow into the vicinity of the current-carrying contact area, so sufficient dielectric strength will be maintained even after the shingle is broken. be able to. Therefore, it is possible to increase the dielectric strength compared to conventional circuit breakers of this type.

As explained above, according to the present invention, the insulated nozzle and the insulated guide are arranged inside the energizing contact part so as to overlap in the central axis direction, so that the high temperature gas exposed to the arc is distributed around the energizing contact part. Since it is prevented from being carried, it is possible to provide a puffer type gas insulator and disconnector with good dielectric strength.

In the above embodiment, an insulating guide is attached to the inner surface of the middle part of the fixed main contact for current-carrying, but the present invention is not limited to this, and embodiments as shown in FIGS. 4 and 5 can be implemented. can do. That is, in FIG. 4, an insulated guide 2 is provided at the end of the fixed main contact 1 for energization, and the insulated guide 2 and the insulated nozzle 4 prevent the gas after extinguishing from flowing into the main contact for energization. The same components as those in FIG. 2 are given the same reference numerals and their explanations are omitted. On the other hand, in the configuration shown in FIG. 5, even in the tripped state, the insulating nozzle 4 does not extend into the energizing fixed side main contact 1, and the main contacts 1 and 5
The insulating guide 2 is extended from the inner surface of the intermediate portion of the fixed main contact 1 for energization so that its tip extends beyond the tip of the insulating nozzle 4 and overlaps with the tip.

With the configurations shown in FIGS. 4 and 5, the second
The same effect as shown in the figure can be obtained.

Furthermore, as shown in FIG. 6, a recess 40 may be formed at the tip of the insulating nozzle 4, and the tip 20 of the insulating guide 2 may be fitted into this recess 40.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the conventional puffer type gas cylinder and disconnector, showing when the upper half is on and when the lower half is on and off. FIGS. 4 to 6 are cross-sectional views showing different embodiments of the present invention when they are turned on and when they are turned on. FIGS. 1... Fixed side main contact for current-carrying, 2... Insulated guide,
3... Fixed side arc contactor, 4... Insulating nozzle, 5...
Movable main contact for energization, 6... Movable arc contact, 7... Movable cylinder, 8... Fixed piston.

Claims (1)

[Scope of Claims] 1. A current-carrying contact portion and an arc contact portion are provided, and the current-carrying contact portion is opened prior to separation of the arc contact portion, and when the arc contact portion is released, the gas in the movable cylinder is removed. is compressed by a fixed piston and sprayed onto the arc contact portion, an insulated nozzle is provided in the movable cylinder so as to surround the arc contact portion, and the energizing contact is provided on the outside of the insulated nozzle. The insulating nozzle has its tip overlapped with the insulating guide in the central axis direction when the shearing is completed, and the insulating guide has the energizing contact on the inner surface of the energizing fixed contact. A puffer-type gas shield and disconnector characterized by being fixedly arranged to prevent high-temperature gas exposed to an arc from flowing into the part. 2. The puffer-type gas shield breaker according to claim 1, wherein the insulating guide is attached near the inner tip of the current-carrying fixed contact. 3. The puffer type gas shield breaker according to claim 1, wherein the insulating guide and the downstream end of the insulating nozzle are fitted into each other to form a blocking member.