JPS6351018A - Buffer 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 puffer type gas circuit breaker, and in particular to a puffer type gas circuit breaker which is an improved method for effectively increasing pressure by gas blowing. Regarding the arc extinguishing chamber of the vessel.

(Prior Art) As the capacity of power generation systems increases, the breaking capacity required of circuit breakers used in substations and switchyards also increases, and high reliability is also required. In order to improve the reliability of circuit breakers, it is important to reduce the number of parts and simplify the structure. Therefore, efforts are being made to reduce the number of breaking points of circuit breakers. Therefore, it is important to increase the breaking capacity per point of the circuit breaker.

In order to improve the breaking performance of conventional general puffer-type gas circuit breakers, it is necessary to increase the gas blowing pressure. Therefore, a large puffer cylinder is operated at a fast opening speed to increase the gas inside the puffer chamber. Breaking capacity can be increased by applying pressure to the arc.

(Problem to be solved by the invention) However, such a method not only increases the size of the arc extinguishing chamber, but also requires a large drive device, which makes the manufacturing and operation of the circuit breaker less economical. be exposed.

As a method of suppressing such economic losses and effectively increasing the gas pressure in the puffer chamber, a method of utilizing the thermal energy of the arc has been proposed. It has been found that if this thermal energy is used skillfully, the pressure of the gas in the puffer chamber can be increased and a powerful gas spray can be obtained, thereby improving the blocking performance.

The present invention has been made in view of the above circumstances, and by effectively utilizing the thermal energy of the arc at the time of interruption,
The purpose of the present invention is to provide a puffer-type gas circuit breaker that is compact and provides high interrupting performance with low driving energy.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a hole is provided in the hollow part of the operating rod that drives the puffer cylinder, and the hollow part of the operating rod and the puffer chamber are connected at the initial stage of the shutoff operation. The hollow part of the operating rod and the container are communicated through the hole during the latter half of the shutoff operation, and this interlocking operation is performed by the rotational movement of a control cylinder having a hole on the outer circumferential surface. Configured.

(Function) By adopting the above configuration, the arc energy at the early stage of the breaking operation of the puffer type gas circuit breaker is taken into the puffer chamber through the hollow part of the operating rod, and is used to increase the pressure rise in the puffer chamber, and at the same time, it is used to increase the pressure rise in the puffer chamber. The hollow part of the operating rod can be used as a heat exhaust path, and damage to the seal part of the puffer piston caused by passing through the hole can be avoided.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Figure 1 shows the initial state of the arc extinguishing chamber shutoff operation according to the present invention.
FIG. 3 shows the state at the latter stage of the shutoff operation.

In FIGS. 1 and 3, reference numeral 1 denotes a fixed contact portion, which is composed of a fixed arc contact 4 and a fixed current-carrying contact 3. As shown in FIG. Further, 2 is a movable contact portion.

Hollow operating rod 5, puffer cylinder 6, movable arc contactor 8. Movable current-carrying contact9. An insulating nozzle 10 is fixed. In the movable contact portion 2.

The puffer cylinder 6 forms a puffer chamber 11 with a puffer piston 7 fixed to a fixed part (not shown). Further, in the movable contact portion 2, the hollow portion 5b of the operating rod 5 is provided with holes 22 and 23 communicating with the outside thereof. Moreover, this operating rod 5 is connected to the control cylinder 2.
It is inserted in 1. A spiral groove 27 is carved on the side surface of this control cylinder 21, and it fits into a protrusion 26 provided on the puffer piston 7, and as the movable part moves, this control cylinder moves relative to the operating rod. It is configured to perform rotational movement. As a result, at the beginning of the shutoff operation, the hole 22 provided in the operating rod 5 is connected to the hole 22 in the control cylinder.
4, the holes 23 and 25 do not match, and the hollow portion 5b of the operating rod 5 communicates with the puffer chamber 11.

(Figures 1 and 2) In the latter half of the shutoff operation, as a result of the relative rotational movement between the operating rod and the control cylinder, the holes 22 and 24 are offset, and the holes 23 and 25 are aligned, so that the hollow of the operating rod 5 is closed. The portion 5b is communicated with the surrounding gas space. (FIGS. 3 and 4.) A convex portion 5c is provided at the rear end of the hollow portion 5b of the operating rod 5 to smoothly guide the flow of gas in the axial direction to the hole 5a.

(Effect of Example) Next, the present invention will be explained in detail with reference to FIGS. 1 to 4.

As described above, FIGS. 1 and 2 show the initial state of the shutoff operation. In this state, the arc 13 is generating a large amount of heat, but the nozzle 10 has not yet opened sufficiently, so it has no blocking ability.

In addition, in the cut-off state shown in the figure, the hollow portion 5 of the operating rod
b communicates with the inside of puffer chamber 11 through holes 22 and 24.

On the other hand, at the beginning of such a cutoff operation, the pressure inside the puffer chamber 11 has not increased much, so the arc 1
The expanded flow of gas from 3 becomes a flow 12b that passes through the hollow part 5b of the rod 5, and rapidly flows into the puffer chamber 11.The expanded flow 12c also occurs in conventional puffer type gas circuit breakers, but it is a flow due to heat. 12b is very large, so
Heat is effectively applied to the gas in the puffer chamber 11. This is,
Since it is added to the original compression operation of the puffer piston 7 and the puffer cylinder 6, the pressure inside the puffer chamber 11 increases.6 After that, as shown in FIGS. It communicates with the surrounding area through. Therefore, the hollow part 5b of the agricultural rod 5 is opened to the surrounding gas part, and the heat from the arc is released. In this state, the nozzle 1o is already fully opened, so
The current can be cut off. Since the heat taken into the puffer chamber 11 is distributed almost uniformly within the cylinder, the high pressure increase persists until the shutoff operation is completed. Therefore, a high-speed gas flow is blown onto the arc for a long period of time, so that high breaking performance can be obtained.

Note that when changing from the state shown in FIG. 1 to the state shown in FIG. 3, the seal portion 7a of the puffer piston only slides on the side surface of the control cylinder 21 and does not pass through the hole. Therefore, it is possible to prevent damage to the seal portion, and high reliability can be achieved.

〔Effect of the invention〕

Abnormality As mentioned above, according to the present invention, a higher pressure rise can be obtained in the puffer chamber than in the conventional example, so a puffer type gas circuit breaker with high breaking performance can be provided using a small arc extinguishing chamber and a small drive device. In addition, since the seal portion of the puffer piston does not pass through the hole, it is possible to prevent 411fJA of the seal portion, and high reliability can be achieved.

[Brief explanation of drawings]

1 and 2 are a sectional view and a partial plan view showing an embodiment of the initial breaking operation of the puffer-type gas circuit breaker of the present invention, and FIGS. 3 and 4 are diagrams of the puffer-type gas circuit breaker of the present invention. FIG. 7 is a cross-sectional view and a partial plan view showing an example of the latter stage of the shutoff operation. 1... Fixed contact part 2... Movable contact part 3.
・・Fixed current-carrying contact 4・・Fixed arc contact 5・
...Operating rod 5b...Operating rod hollow part 5
c... Convex portion 6... Puffer cylinder 7... Puffer piston 7a°°" Puffer piston seal portion 8... Movable arc contact 9... Movable energizing contact 1
0... Insulated nozzle 11... Puffer chamber 12
...Gas flow 12a, 12b, 12c・
...Hot gas flow 13...Arc 21...
Control cylinder 22, 23...Operating rod hole 24, 25...Control cylinder hole 26...Protrusion 27
...Spiral groove 3 4 /3 /2C/2b 21 . 5C Figure 1 Figure 2

Claims (1)

[Claims] (1) In a container filled with arc-extinguishing gas, there is a puffer chamber that has a fixed contact part and a movable contact part that can be moved in and out, and a puffer piston and a puffer cylinder provided in the movable contact part. An operating rod that drives the puffer cylinder in a puffer-type gas circuit breaker that compresses gas and guides it to the nozzle to cool and extinguish the arc generated between the fixed and movable arc contacts. The operating rod is inserted into a freely rotating control cylinder having first and second holes in the hollow part, third and fourth holes and a spiral groove on the outer peripheral surface thereof, and the operating rod is provided in the puffer piston. The control cylinder is configured to move while rotating as the movable part moves by fitting the protrusion into the spiral groove of the control cylinder, and at the initial stage of the shutoff operation, the first and third holes are closed. By matching, the hollow part of the operating rod and the puffer chamber are communicated through the hole, and in the latter half of the shutoff operation, the second hole and the fourth hole match, so that the hollow part of the operating rod communicates with the puffer chamber through the hole. A puffer-type gas circuit breaker, characterized in that the puffer-type gas circuit breaker is configured to communicate with the container through the hole.