JPS6398928A - 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] [Purpose of the invention] (Industrial application field) The present invention relates to an arc extinguishing chamber of a buffer type gas shield.

(Prior Art) As the capacity of power generation systems increases, the crossing capacity +J required for 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 conventional puffer-type gas circuit breakers, it is necessary to increase the gas blowing pressure to improve the circuit breaking performance. To achieve this, a large buffer cylinder is operated at a high opening speed to increase the gas inside the buffer 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 within the buffer 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 buffer chamber can be increased and a favorable gas spray can be obtained, thereby improving the shutoff 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 buffer type gas circuit breaker that is small and has high interrupting performance with a small amount of energy.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above [1], in the present invention, a hole is provided in the hollow part of the operating rod that drives the buffer cylinder, and at the beginning of the shutoff operation, the hollow part of the operating rod and the buffer The hollow part of the operating rod is communicated with the chamber through the hole, and the hollow part of the operating rod is communicated with the container through the hole during the latter half of the shutoff operation, and by opening and closing the shielding plate, the interior of the operating rod is also communicated during the latter half of the shutoff operation. The structure was designed to ensure an exhaust gas flow path.

(Function) By adopting the above configuration, the arc energy at the beginning of the breaking operation of the buffer type gas circuit breaker is taken into the buffer chamber through the hollow part of the operating rod, and is used to increase the pressure rise in the buffer chamber, and the arc energy is used to increase the pressure rise in the buffer chamber. In the latter stage, the hollow part of the operating rod is used as a heat exhaust path.

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

FIG. 1 shows the initial state of the arc-extinguishing chamber shutoff operation according to the present invention.

In FIG. 1, reference numeral 1 denotes a fixed contact section, which is composed of a fixed arc contact 4 and a fixed current-carrying contact 3. Further, 2 is a movable contact portion, to which a hollow operating rod 5, a buffer cylinder 6, a movable arc contact 7r8, a movable energizing contact 9, and an insulating nozzle 10 are fixed. Movable contact part 2
In the buffer cylinder 6, a fixed portion (not shown) is provided.

) forms a buffer chamber 11. Furthermore, in the movable contact portion 2,
A hole 5 that communicates between the hollow part 5b of the operating rod 5 and the outside thereof
As shown in FIG. 1, at the beginning of the shutoff operation, a is
The hollow portion 5b of the operating rod 5 is processed to communicate with the buffer chamber 11. Also, in this state, the operating rod 5
A blocking plate 14 mounted inside is pushed by a spring 15 and is in a position to close the inside of the operating rod.

As shown in FIG. 2, the hole 5a is configured so that when it passes the inner diameter end 7a of the buffer piston 7 in the latter half of the shutoff operation, the hollow portion 5b of the operating rod 5 communicates with the surrounding gas space. In this state, the shielding plate 14
contacts a presser mechanism 16 supported by a fixed part (not shown) provided inside the operating rod and is pushed out to create a gas flow path 17 inside the operating rod that goes to the right in the figure.

(Operation of the embodiment) Next, the present invention will be explained in detail with reference to FIGS. 1 and 2. As described above, FIG. 1 shows the initial state of the shutoff 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 has no interrupting ability. Further, in the cut-off state shown in the figure, the hole 5a of the operating rod has not yet passed the end 7a of the buffer piston 7, so the hole 5a communicates with the inside of the buffer chamber 11.

On the other hand, at the beginning of such a cutoff operation, the pressure inside the buffer chamber 11 has not increased much, so the arc 1
The expanded gas flow from the rod 5 becomes a flow 12b passing through the hollow portion 5b of the rod 5, and rapidly flows into the buffer chamber 11. Expanded flow 12c occurs in conventional buffer circuit breakers, but thermal flow 12b is much larger and therefore effectively imparts heat to the gas within buffer chamber 11. Since this is added to the original compression operation of the buffer piston 7 and buffer cylinder 6, the pressure within the buffer chamber 11 increases. Thereafter, as shown in FIG.
It passes through the end of the tube and communicates with the surrounding area. Therefore, the hollow portion 5b of the operating rod 5 is open to the surrounding gas, and the 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 buffer chamber 11 is distributed almost uniformly within the cylinder, the high pressure rise continues 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. Also, at this stage, the blocking plate 14
is pushed wide by the holding mechanism 16 to create a gas flow path 17, so that a new gas gap 18 is created that passes through this gas flow path 17. The gas flow 18 flows out of the presser mechanism through the hole 16a of the presser mechanism 16, and flows as a flow path throughout the interior of the operating rod. Therefore, the heat generated between the electrodes due to the generation of the arc is efficiently removed through these gas flow paths, and good interrupting performance can be achieved.

〔Effect of the invention〕

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

With a small arc extinguishing chamber and a small drive device, it is possible to provide a buffer type gas circuit breaker with high breaking performance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the buffer type gas circuit breaker of the present invention in the early stage of the breaking operation, and FIG. 2 is a sectional view showing an embodiment of the buffer type gas circuit breaker of the present invention in the latter stage of the breaking operation. be. 1... Fixed contact part 2... Movable contact part 3.
・・Fixed current-carrying contact 4・・Fixed arc contact portion・
・Operation rod 5a...Operation rod hole 5b・
...Operating rod hollow part 5c...Convex part 6...Buffer cylinder 7...Buffer piston 7a...Buffer piston end 8...Movable arc contact 9...Movable current-carrying contact 1
0... Insulating nozzle 11... Buffer chamber 12
... Gas flow 12a, 12b, 12c... Hot gas flow 13... Arc 14... Shutoff plate 15... Spring 1
6... Presser mechanism 17... Gas flow path 18
...Hot gas flow agent Patent attorney Nori Chika Ken Yudo Hirofumi Mitsumata J Figure 1 Figure 2

Claims (1)

[Claims] (1) 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 a buffer chamber consisting of a buffer piston and a buffer cylinder provided in the movable contact part. In a buffer type gas circuit breaker, which compresses gas, guides it to the nozzle part, blows it onto the arc generated between the fixed and movable arc contacts, and cools and extinguishes the arc. A hole is provided in the center of the operating rod that drives the operating rod, and during the initial stage of the shutoff operation, the hollow part of the operating rod and the buffer chamber are communicated through the hole, and during the latter half of the shutoff operation, the center of the operating rod and the container are communicated with each other. A shielding plate fixed to the operating rod by a spring and capable of opening and closing is provided on the inner surface of the operating rod on the opposite side from the arc contact in the hole of the operating rod. The shielding plate closes to prevent gas from flowing inside the operating rod, and in the later stages of the shutoff operation, the shielding plate contacts a fixed presser mechanism and opens, creating a gas flow path inside the operating rod. A buffer type gas shield that features: