JPS62229622A - Buffer type gas blast breaker - 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 [Object of the Invention] (Industrial Application Field) The present invention relates to a single-buff gas breaker used in a substation or switchyard of a power system.

(Prior Art) A puffer type gas breaker has a pair of fixed and movable contacts housed in a container filled with an arc-extinguishing medium such as SFs gas. The movable contact is connected to a drive section and driven by air pressure, a spring, hydraulic pressure, or the like. Figure 2 (A>
(B) shows the contact part of a puffer type gas breaker. A puffer cylinder 2 is fixed to a movable arc contact 1, and a puffer chamber is formed by this puffer cylinder 2 and a puffer piston 3 fixed to a container. configured. The puffer cylinder 2 moves with the opening and closing operations of the movable arc contactor 1.
The puffer chamber is compressed by the relative movement with the puffer piston 3 to create high pressure gas.

When the current is cut off, an arc is generated between the movable arc contact 1 and the fixed arc contact 4, and high pressure gas in the puffer chamber is blown onto this arc via the insulator nozzle 5 to cool the arc. At this time, the gas flow is blown out from the hollow part of the insulating material nozzle 5 and the movable arc contactor 1 through the hollow part of the operating rod 6 and from the horizontal hole 7 of the operating rod 6, resulting in a so-called double flow type. Eventually, the arc will disappear at the current zero point, leading to interruption.

However, such a puffer-type gas breaker has the disadvantage that the driving force becomes large because the contacts must be separated in response to the puffer pressure.

On the other hand, if the arc energy is used for gas compression, the driving energy can be reduced, so conventional methods have been developed in which the insulator nozzle 5 is made smaller, the nozzle 5 is blocked by an arc, and the arc energy is guided to the puffer chamber, and the operating rod A so-called hybrid flow type has been proposed in which the arc energy is guided by passing through the puffer chamber and the hollow part through the horizontal hole 7 of the arc.

Among these, an example of a puffer type gas breaker based on the hybrid 70 type is shown in Fig. 3 (A) and (B), in which the horizontal hole 7 of the operating rod 6 is connected to the puffer chamber for a while after opening. Although the pressure in the puffer chamber is increased, in the second half of the opening operation, the original double flow type is used. Therefore, by changing the position or size of the horizontal hole 7, the amount of arc energy injected can be changed, and compared to the method of guiding arc energy by reducing the diameter of the insulator nozzle 5, the arc energy is Since the gas flow is led from the current point, the gas flow quickly recovers at the current zero point, and excellent breaking performance can be obtained.

However, in this hybrid flow one-way type, the horizontal hole 7 of the operating rod 6 connects the sliding seal portion of the puffer piston 3 with ia
If the arc energy is large, there is a possibility that this rib seal may be damaged because the arc passes through the arc and high-temperature gas is blown directly onto the area.

(Problems to be Solved by the Invention) As mentioned above, the conventional hybrid flow one-type puffer type gas breaker has the problem that the active seal between the operating rod and the puffer piston is damaged. .

The present invention has been proposed to solve and overcome these problems, and its purpose is to achieve excellent shutoff performance as a hybrid flow one-type system, while also eliminating the sliding seal between the operating rod and the puffer piston. An object of the present invention is to provide a puffer type gas breaker which prevents damage to the gas.

[Structure of the Invention] (Means for Solving the Problems) The seven-type buff gas breaker of the present invention has a control rod that includes:
A horizontal hole is provided behind the active seal with the puffer piston,
The puffer piston is provided with a sliding receiving part behind this horizontal hole, and the sliding receiving part and the gas chamber formed by the puffer cylinder, the sliding seal part of the puffer piston, and the operating rod are connected to the hollow part of the operating rod. Further, the puffer chamber and the gas chamber are communicated with each other through an inlet provided in the puffer piston.

(Function) With the above configuration, arc energy is injected into the first buffer chamber via the gas chamber until the horizontal hole passes through the receiving part, and after that it becomes a double flow one-way system, so the sliding of the puffer piston High-temperature gas is not blown directly onto the seal portion, preventing damage to the sliding seal portion.

(Example) An example of the present invention will be specifically described based on FIGS. 1(A) and (B). In addition, Fig. 2 (A) (B) and Fig. 3 (A
) The same parts as in the conventional example shown in (B) are given the same reference numerals.

Structure of this Example FIG. 1 (Δ) (B) shows the contact portion of a puffer type gas breaker. The fixed arc contact 4 and the fixed current-carrying contact 8 are fixed by a fixed support 9 and fixed to one side of a container (not shown). The puffer piston 3 is fixed on the opposite side of the container. On the other hand, the operating rod RO supporting the movable arc contactor 1 is connected to a drive section disposed on the same side as the buff 1 piston 3 via an insulating rod or the like (not shown). Note that an arc-extinguishing gas such as SF6 gas is sealed in the container.

A puffer cylinder 2 concentric with the operating rod 6 is fixed to the operating rod 6, and the inner and outer circumferential parts of the buff 1 piston are provided with:
Sliding seal portions 3a and 3b with the outer circumferential portion of the operating rod 6 and the inner circumferential portion of the puffer cylinder 2 are illustrated. An insulator nozzle 5 concentric with the movable arc contact 1 is arranged around the movable arc contact 1 and fixed to the puffer cylinder 2 by a movable energizing contact 10 .

A gas flow path is provided between the insulator nozzle 5 and the movable arc contact 1, and this gas flow path is connected to a communication hole ( (not shown) communicates with a puffer shaft consisting of a buff 1 piston 3, a puffer cylinder 2, and an operating rod 6.

Inner and outer gas chambers configured between the rear of the inner and outer sliding seal portions 3a3b of the puffer piston and the sliding receiving portions 3c and 3d communicate with each other through an opening 11. Through the horizontal hole 7 provided in the rod 6,
It communicates with the hollow part of the operating rod 6, and the outer gas chamber communicates with the puffer chamber through a thank-you inlet 12 provided in the puffer piston. The puffer cylinder 2 vibrates with the sliding receiving part 3d and the operating rod vibrates with the sliding receiving part 3C, but as shown in FIG. 1(A), in the closed state, the puffer cylinder 2 vibrates with the sliding receiving part 3d. has not been reached and therefore no outer gas chamber is formed.

Function of this embodiment Next, the function of this embodiment will be explained. When an opening command is given in the closed state shown in FIG. 1(A), the movable part is driven by the drive part and disengages. That is, first, the movable current-carrying contact 10 is separated from the fixed current-carrying contact 8, and then,
The movable arc contact 1 dissociates from the fixed arc contact 4,
At this time, an arc is generated between the rain contacts. Immediately after the electrode is opened, the horizontal hole 7 of the operating rod 6 is located between the inner sliding seal part 3a and the inner sliding receiving part 3C of the puffer screw 1-3, so that the arc energy enters the gas chamber through the horizontal hole 7. Further, it is introduced into the buffer chamber 1 through the suction port 12 of the puffer piston 3.

17114f1 In the latter half of the operation, the horizontal hole 7 passes through the inner sliding receiving part 3G and becomes a double throw that blows out arc energy into the container.

Effects of this embodiment Next, the effects of this embodiment will be explained. In this embodiment, the horizontal hole of the operating rod is provided behind the inner sliding seal part of the buff 1 screw 1-, and the inner and outer sliding receiving parts are further provided behind it. By creating an internal and external gas chamber consisting of an operating rod and a puffer cylinder, communicating the gas chamber and the hollow part of the operating rod through a horizontal hole, and communicating the gas chamber and puffer chamber through an inlet, a hybrid flow system is created. As a system, it has the excellent effect of maintaining high breaking performance and preventing damage to the sliding seal part of the puffer piston by preventing arc energy from acting directly on the sliding seal part.

*Other embodiments In the above embodiments, the inlet of the puffer piston was just a hole, but a check valve was provided here to open it when the pressure in the puffer chamber was lower than the pressure in the gas chamber. It is also possible to configure In addition, in the above embodiment, in order to prevent the puffer chamber from becoming negative pressure at the time of charging, the puffer cylinder 2
is configured so that it does not reach the outer sliding receiving part 3d in the closed state, but a check valve is provided on the outer sliding receiving part 3d, and this valve is opened when the pressure in the gas chamber drops below the gas in the container. By configuring it as shown in FIG.

[Effects of the Invention] As explained above, according to the present invention, the puffer cylinder,
A gas chamber is constituted by the operating rod of the sliding seal portion of the puffer piston and the active receiving portion of the puffer piston, and this gas chamber is communicated with the hollow portion of the operating rod through the horizontal hole of the operating rod, and the suction provided in the puffer screw 1. By having a structure in which the opening communicates between the buffer chamber 1 and the gas chamber, the puffer screw 1-
By realizing a hybrid flow type gas breaker that does not damage the sliding seal part of the pump, a highly reliable and high-performance puffer type gas breaker can be obtained.

[Brief explanation of drawings]

Fig. 1 (△) (B) is a sectional view showing the contact portion of one embodiment of the puffer type gas breaker according to the present invention, and Fig. 2 (A) (
B) is a cross-sectional view showing a conventional double flow one-type puffer type gas breaker, and third (A>(B) is a cross-sectional view showing a conventional hybrid flow one-type puffer type gas breaker. In both figures, (A) shows the closed state, and (B) shows the open state. 1... Movable arc contact, 2... Puffer cylinder, 3... Puffer piston, 3a, 3b... Puffer Sliding seal portion of piston, 3c, 3d... Sliding receiving portion of puffer piston, 4... Fixed arc contact, 5
...Insulator nozzle, 6...Operation rod, 7...Horizontal hole, 8...Fixed current-carrying contact, 9...Fixed support part, 1
0... Movable energizing contact, 11... Opening of puffer piston, 12... Inlet of puffer piston.

Claims (3)

[Claims] (1) SF_6 a pair of contacts that relatively contact and dissociate
A hollow operating rod, which is housed in a container filled with arc-extinguishing gas such as gas and supports a hollow movable contact, is connected to the drive unit via an insulating rod, and a concentric puffer is installed around the operating rod. The inner and outer circumferences of the puffer piston, which is equipped with a cylinder and is fixed to the container, are slidably sealed to the outer circumference of the operating rod and the inner circumference of the puffer cylinder, respectively, and around the movable arc contactor, In a puffer type gas breaker in which an insulating nozzle is provided concentrically to form a gas passage communicating with a puffer chamber composed of a puffer piston, a puffer cylinder, and an operating rod, the operating rod includes: A horizontal hole communicating between the hollow part and the outside is provided at a position on the driving part side of the sliding seal part of the puffer piston in the inserted state, and a side hole is provided in the supporting part of the puffer piston in a position where the horizontal hole communicates with the outside in the inserted state. A sliding receiving part is provided on the side of the puffer piston, and a gas chamber is constituted by the sliding seal part of the puffer piston, the puffer cylinder, the sliding receiving part of the puffer piston, and the operating rod, and the gas chamber and the operating rod are hollow. The arrangement of the horizontal hole and the sliding receiving part is such that in the latter half of the opening operation, the horizontal hole passes through the receiving part and communicates the free gas space in the container with the hollow part of the operating rod. A puffer-type gas breaker characterized in that the puffer piston is further provided with an inlet that communicates the puffer chamber and the gas chamber. (2) The puffer type gas breaker according to claim 1, wherein the suction port of the puffer piston has a check valve that opens when the pressure in the puffer chamber is lower than that in the gas chamber. (3) The puffer cylinder reaches a receiving part in the put-in state, and the receiving part has a check valve that opens when the pressure in the gas chamber is lower than the gas in the container. Puffer type gas breaker as described.