JPS6319722A - 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 an arc extinguishing chamber of a puffer type gas breaker.

(Prior Art) As the capacity of power transmission systems increases, the amount of disconnection required of circuit breakers used in substations and switchyards 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 breaking point of the circuit breaker. Therefore, it is necessary to increase the amount of disconnection per point of the circuit breaker.

In conventional general puffer-type gas circuit breakers, it is necessary to increase the pressure in order to improve the circuit breaker performance. For this purpose, a large puffer cylinder is moved at a fast opening speed to increase the pressure of the gas in the puffer chamber. If you spray it on the arc, you can increase the amount of arc.

However, such a method not only increases the size of the arcing chamber but also requires a large drive device, making the breaker uneconomical to manufacture and operate.

As a method of suppressing such economic losses and efficiently 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 by skillfully utilizing this thermal energy, it is possible to increase the pressure of the gas in the puffer chamber, resulting in powerful gas spraying and thus improving the shutoff performance.

As a specific method, the drive rod that drives the movable electrode part of the breaker and the puffer cylinder is made hollow, a hole is provided in the hollow part of the drive rod, and during the initial period of the breaker operation, an arc is generated through the hollow part of the operating rod and the hole. It has been devised to introduce a heated arc-extinguishing gas flow into a puffer chamber and use this thermal energy to increase the gas pressure within the puffer chamber.

(Problems to be Solved by the Invention) However, in this method, the strength of the yjA moving rod hole is reduced, which limits the size of the hole that takes in the thermal energy of the arc into the puffer chamber. It has become necessary to increase the wall thickness of the drive rod in order to maintain the strength of the rod, and there is a possibility that the breaking performance cannot be sufficiently improved and the drive device cannot be made smaller. In addition, turbulence occurs in the flow of arc-extinguishing gas in the drive rod hole, and this may also prevent the thermal energy of the arc from being sufficiently absorbed into the puffer chamber.

The present invention has been made in view of the above circumstances, and provides a puffer-type gas breaker that is compact and achieves high breaking performance with low driving energy by effectively utilizing the thermal energy of the arc during breaking. It is an object of the present invention to do so.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention takes the arc energy at the initial stage of the breaking operation of the puffer-type gas breaker into the puffer chamber through the hollow part of the drive rod, thereby reducing the pressure inside the puffer chamber. In the case where the hollow part of the drive rod is used as a heat exhaust path during the latter half of the cut-off operation, the intake and exhaust hole of the drive rod is made into an elongated hole with a length perpendicular to the axis. The present invention is characterized in that a member for reinforcing the arc-extinguishing gas flow and rectifying the arc-extinguishing gas flow is disposed in the hollow portion of the drive rod.

(Function) With this configuration, in the present invention, the thermal energy of the arc can be used effectively, and the driving force can be reduced by reducing the weight of the movable parts.

(Example) An example of the present invention will be described below with reference to FIGS. 1, 2, and 3.

FIG. 2 shows the state of the arc extinguishing chamber according to the present invention in the early stage of the cutoff operation, and FIG. 3 shows the state in the latter half of the cutoff action.

In FIGS. 2 and 3, 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, and a puffer cylinder 6, a movable arc contact 8, a movable energizing contact 9, and an insulating nozzle 10 are fixed to a hollow drive rod 5. In the movable part contactor part 2, the puffer cylinder 6 is
A puffer 11 is formed with the puffer piston 7 fixed to a fixed part (not shown). Further, in the movable part contactor part 2, the hole 5a communicating between the hollow part 5b of the drive rod 5 and the outside thereof is connected to the drive rod 5 as shown in FIG.
As shown in FIG. 1, the hollow part 5b of the drive rod 5 communicates with the inside of the puffer chamber 11 at the beginning of the breaker operation, as shown in FIG. . (Fig. 2) As shown in Fig. 3, this hole 5a communicates with the hollow part 5b of the drive rod 5 and the surrounding gas space when it passes the inner diameter end 7a of the puffer piston 7 in the latter half of the shutoff operation. It is composed of

Further, a cross-shaped reinforcing plate 5C is inserted into the hollow part of the drive rod 5 to reinforce the opening of the hole 5o. As shown in FIG. 1, this reinforcing plate 5C is machined into a smooth streamlined shape from the apex of the sixteen-shaped reinforcing arm toward the opening hole 5a in order to smoothly guide the axial gas flow to the hole 5a. has been done.

(Operation of the embodiment) Next, the present invention will be explained in detail with reference to FIGS. 1, 2, and 3. As mentioned above, FIG. 2 shows the initial state of the cutoff operation. In this state, the arc 13 is generating a large amount of heat, but since the nozzle 10 has not yet opened sufficiently, it does not have the ability to shut off. Further, in the cut-off state shown in the figure, the hole 5a of the drive rod has not yet passed the end 7a of the puffer piston 7, so the hole 5a communicates with the inside of the puffer chamber 11.

On the other hand, at this early stage of shutoff, the pressure inside the puffer chamber 11 has not increased much, so the arc 1
The expanded flow of gas from the rod 5 becomes a flow 12b passing through the hollow portion 5b of the rod 5, and rapidly flows into the breader chamber 11. Expanded flow 12c also occurs in conventional puffer-type gas circuit breakers, but thermal flow 12b is much larger and can therefore effectively impart heat to the gas within puffer chamber 11. Since this is added to the original compression operation of the puffer piston 7 and the puffer cylinder 6, the pressure in the puffer chamber 11 increases.

The hole 5a then passes through the end 7a of the puffer piston 7 and communicates with the surroundings, as shown in FIG.

Therefore, the hollow portion 5b of the drive rod 5 is open to the surrounding gas, and heat from the arc is released. In such a state, the nozzle 10 is already fully opened, so that the current can be cut off. What is the heat taken into the puffer chamber 11?

Since it is distributed almost uniformly within the cylinder, the high pressure rise persists until the end of the shutoff operation.

Therefore, high-speed gas flow is blown onto the arc for a long period of time, so high breaking performance can be obtained. Furthermore, as shown in FIG. 1, the shape of the exhaust hole 5a of the drive rod is such that the exhaust hole is elongated at right angles to the axial direction, so that heat can be drawn into the puffer chamber more slowly than an exhaust hole that has the same area and is elongated in the axial direction. A larger increase in gas pressure within the puffer chamber 11 can be obtained, and switching between intake and exhaust can be performed smoothly. Furthermore, by reinforcing the opening 5a of the hollow drive rod 5 with a cross-shaped reinforcing plate 5C, the strength of the drive rod 5 is not determined by the exhaust port 5a, but by the pipe, which reduces the wall thickness of the pipe. It is economical because the moving parts are light and can be driven by a small drive unit. Also, the reinforcing material does not have to be a cross.

〔Effect of the invention〕

As described above, according to the present invention, a higher pressure increase can be obtained in the puffer chamber than in the conventional example.

It is possible to provide a puffer type gas breaker with a small arc extinguishing chamber, a light weight, and a small drive device with high breaking performance.

[Brief explanation of drawings]

FIG. 1 is a detailed view of the driving rod opening hole and reinforcing plate of a puffer type gas breaker according to an embodiment of the present invention.
, (b), and (e) are a sectional view, a perspective view, and a front view, respectively; FIG. 2 is a sectional view of the present breaker according to the present invention at an early stage of the breaker operation; and FIG. 3 is a sectional view of the same at a later stage of the breaker operation. . 1... Fixed contact portion, 2... Movable contact portion. 3... Fixed current-carrying contact, 4... Fixed arc contact. 5... Drive rod, 5a... Drive rod hole, 5b... Drive rod hollow part, 5c... Reinforcement plate, 6... Puffer cylinder. 7... Puffer piston, 7a... Puffer piston end, 8... Movable arc contact, 9... Movable energizing contact, 1o... Insulating nozzle, 11°°° buffer chamber, 12. ... Gas flow, 12a, 12b, 12c... Hot gas flow,
13... Ark. Agent Patent attorney Noriyuki Chika Yudo Hirofumi Mitsumata 5oL (C) Figure 1 Figure 2

Claims (1)

[Claims] A container filled with arc-extinguishing gas has a fixed contact part and a movable contact part that can be moved in and out, and compresses a puffer chamber consisting of a puffer piston and a puffer cylinder provided in the movable contact part. In a puffer-type gas cylinder and disconnector that compresses gas and guides it to the nozzle part and cools and extinguishes the arc generated between the fixed and movable arc contacts, the drive rod that drives the puffer cylinder. An elongated hole whose length is perpendicular to the axial direction is provided in the hollow part, and the hollow part of the drive rod and the puffer chamber are communicated through the elongated hole during the initial stage of the shearing operation, and during the later stage of the shearing action. is configured so that the drive rod hollow part and the container communicate with each other through the elongated hole, and an arc-extinguishing property that occurs in the inner hollow part of the drive rod elongated hole part during the crimping operation along the axial direction. A puffer-type gas sheath disconnector, characterized in that a member is provided to perform a rectifying action to guide the gas flow to the elongated hole and to reinforce the drive rod hole.