JPS62229624A - 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 arc extinguishing of a puffer-type gas breaker, and in particular improves the method of increasing the gas pressure in the puffer chamber. .

(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 number of breaking points in circuit breakers. Therefore, it is necessary to increase the amount of disconnection per point of the circuit breaker.

In conventional general puffer type gas breaker, it is necessary to increase the pressure in order to improve the breaker performance.
For this reason, it is possible to increase the breaker capacity by moving a large puffer cylinder at a high opening speed and making the gas in the puffer chamber high pressure and blowing it against the arc.

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

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 if this thermal energy is used skillfully, the pressure of the gas in the blow chamber can be increased and a powerful arc spray can be obtained, thereby improving the interrupting performance.

The present invention has been made in view of the above circumstances, and provides a buff 1 type gas breaker that is compact and provides high breaking performance with small driving energy by effectively utilizing the thermal energy of the arc during breaking. It is an object of the present invention to provide.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, in the present invention, the operating rod that drives the movable part is divided into a part connected to the operating mechanism part and a part supporting the movable contactor/puffer cylinder. The hollow part of the operating rod and the expansion chamber are communicated through the gap during the initial stage of the shutoff operation, and the hollow part of the operating rod communicates with the surrounding gas space during the latter half of the shutoff operation. and are configured to communicate with each other through the gap.

(Function) The arc energy at the beginning of the breaker operation of the puffer type gas breaker is taken into the puffer chamber through the hollow part and gap of the drive rod, and used to increase the pressure rise in the puffer chamber. Use the hollow part as a heat exhaust path.

(Tsubaki Birch Embodiment) (Structure of the Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows the state of the arc-extinguishing seedling according to the present invention in the early stage of the breaking operation, and FIG. 2 shows the state in the latter half of the breaking action.

In FIGS. 1 and 2, reference numeral 1 denotes a fixed contact portion, which is composed of a fixed arc contact 4 and a fixed current-carrying contact 3. Further, the operating rod is connected to the operating mechanism section 5.
a and a support part 5b for the movable contact part 2 (including the puffer cylinder 6, movable arc contact 8, movable current-carrying contact 9, and insulating nozzle 10), which are connected by a rod 5G and A gap 5d is provided between them. In the movable part contactor part 2, the puffer cylinder 6 forms a puffer 11 with a puffer piston 7 fixed to a fixed part (not shown). Moreover, in the movable part contactor part 2, the hollow part 5e of the drive rod is
As shown in FIG. 1, at the initial stage of the shutoff operation, the driving rod is configured to communicate with the inside of the puffer chamber 11 through a gap 5d.

As shown in FIG. 2, this gap 5d is configured to communicate with the hollow portion 5e of the drive rod 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.

A protrusion 5f is provided at the front end of the drive rod portion 5a to smoothly guide the axial gas flow to the gap 5d.

[Effect of the embodiment]

Next, the present invention will be explained in detail with reference to FIGS. 1 and 2. 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. In addition, in the cutoff state shown in the figure,
Since the gap 5d of the drive rod has not yet passed the end 7a of the puffer piston 7, the gap 5d communicates with the inside of the puffer chamber 11.

On the other hand, at the beginning of such a cutoff, the puffer room 1
Since the pressure within the puffer chamber 1 does not necessarily increase, the expanding flow of gas from the arc 13 becomes a flow 12b passing through the hollow portion 5e of the rod and rapidly flows into the puffer chamber 11. Although the expanded flow 12c occurs in conventional puffer-type gas interrupters, the thermal flow 12b is much larger and can therefore effectively impart heat to the gas within the puffer chamber 11. Since this is added to the original compression operation of the puffer piston 7 and the puffer cylinder 6, the pressure within the puffer chamber 11 increases.

Thereafter, as shown in FIG. 2, the gap 5d passes through the end 7a of the puffer piston 7 and communicates with the surroundings. Therefore,
The hollow portion 5e of the drive rod 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. Since the heat taken into the pant 1 chamber 11 is almost uniformly distributed within the cylinder, the high pressure increase continues until the shutoff operation is completed.

Therefore, high-speed gas flow is blown onto the arc for a long period of time, so high breaking performance can be obtained.

In the process of this action, the flow path through which the arc energy passes is created through an opening in the side of the hollow operating rod.
By creating a gap between the operating rods that are divided into two as described above, the effective cross-sectional area can be maximized, and the efficiency of both the use and removal of arc energy can be maximized. .

(Effects of the Invention) As described above, according to the present invention, a higher pressure rise can be obtained in the puffer chamber compared to the conventional example, so that a puffer-type gas with high breaking performance can be produced in a small arc extinguishing chamber and a small drive device. A circuit breaker can be provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention in the early stage of the cutoff operation, and FIG. 2 is a sectional view showing an embodiment of the present invention in the later stage of the cutoff operation. 1... Fixed contact part 2... Movable contact part 3.
...Fixed current-carrying contact 4...Fixed arc contact 5a
, 5b... Operating rod 5C... Connecting rod 5d
...Gap between the operating rods 5e...Hollow portion of the operating rod 5f...Convex portion 6.
... Puffer cylinder 7 ... Puffer piston 7a
...Puffer piston end 8...Movable arc contact 9...Movable current-carrying contact 10...Insulating nozzle 11...Puffer to 12...Gas flow 12a, 12b, 12cm...Hot gas Flow 13-...
Ark Agent Patent Attorney Nori Chika Ken Yudo Wang Hou Hongbun Figure 2

Claims (1)

[Claims] (1) A puffer chamber that has a fixed contact part and a movable contact part that can be moved in and out of a container filled with arc-extinguishing gas, and is composed of a puffer piston and a puffer cylinder provided in the movable contact part. In a puffer type gas breaker, the gas is compressed and introduced into the nozzle part, and is blown onto the arc generated between the fixed and movable arc contacts to cool and extinguish the arc. The operating rod to be driven is divided into a part connected to the operating mechanism section and a part supporting the movable contact and the puffer cylinder, and a gap is provided between these parts, so that the hollow part of the operating rod is used at the initial stage of the shutoff operation. and the puffer chamber through the gap, and in the latter half of the shutoff operation, the hollow part of the operating rod and the container are communicated through the gap.