JPS62206730A - Buffer type gas insulated 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] [Purpose 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 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 in the circuit breaker.

Therefore, it is necessary to increase the breaking capacity per point of the breaker.

In conventional general puffer type gas circuit breakers, it is necessary to increase the gas pressure in the puffer chamber in order to improve the breaker performance.For this purpose, a large puffer cylinder is moved at a fast opening speed to increase the gas pressure in the puffer chamber. Breaking capacity can be increased by applying high pressure gas to the 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.

(Problems to be Solved by the Invention) A method of utilizing arc thermal energy has been proposed as a method of suppressing the above-mentioned economic loss and efficiently increasing the gas pressure in the puffer chamber.

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 arc spray can be obtained, thereby improving the interrupting performance. However, since the hole through which hot gas blows out through the heat exhaust path in the hollow part of the drive rod directly faces the inner surface of the puffer chamber, the inner surface can be damaged by the hot gas, resulting in incomplete operation such as galling when used repeatedly. was there.

On the other hand, during high-speed re-closing operation and subsequent shut-off operation, the hot gas exhausted from the hole in the operating rod is taken into the puffer cylinder again when it is turned on, so there is a drawback that performance deteriorates during the second shut-off.

The present invention was made in view of the above circumstances, and effectively utilizes the thermal energy of the arc at the time of interruption, is not damaged by exhaust heat gas, can sufficiently perform high-speed re-starting operation, has a long life, is compact, and is It is an object of the present invention to provide a puffer type gas breaker that can obtain high breaking performance with small driving energy.

[Structure of the invention]

(Means for solving the problem) In a puffer type gas breaker that extinguishes the arc by blowing gas compressed by a puffer piston and a puffer cylinder through a hole provided in the hollow part of the operating rod, and exhausts the exhaust gas. , a generally cylindrical member is attached to the perforated portion of the puffer piston through which exhaust gas passes.

(Function) By configuring the present invention as described above, exhaust gas does not directly hit the puffer cylinder, and exhaust gas does not enter the puffer chamber composed of the puffer piston and the puffer cylinder.

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

(Structure) FIG. 1 shows the state of the arc extinguishing chamber according to the present invention in the early stage of the breaker operation, and FIG. 2 shows the state in the later stage of the breaker 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. Reference numeral 2 denotes a movable contact portion, in which a puffer cylinder 6, a movable arc contact 8, a movable energizing contact 9, and an insulating nozzle IO are fixed to a hollow operating rod 5. In the movable contact portion 2, the puffer cylinder 6 forms a puffer chamber 11 with a puffer piston 7 fixed to a fixed portion (not shown). In addition, in the movable part contactor part 2, the hole 5a that communicates between the hollow part 5b of the operating rod 5 and the outside thereof is connected to the hollow part 5b of the operating rod 5 and the puffer chamber 1 at the initial stage of the shutoff operation, as shown in FIG.
1 is processed so as to communicate with each other.

(Fig. 1) As shown in Fig. 2, this hole 5a communicates with the hollow part 5b of the operating 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 configured. 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.

The support part of the puffer piston 7 has a cutout hole 7 opposite to the hole 5a in order to release the gas from the hole 5a into the container.
b is open. Furthermore, the diameter of the supporting part of the puffer piston 7 is increased or equal to the length of the puffer piston 7.
When the inner sliding range 6a of the puffer cylinder, which slides on the outer side 7b of the partition wall portion during operation, is in an open state, the rod hole 5
A cylindrical partition wall 14 having a length such that it does not directly receive the hot gas discharged from a is attached to face the cutout hole 7d of the puffer piston. Further, a check valve 15 is provided on the partition wall of the puffer piston 7 to open and close based on the pressure difference between the puffer chamber 11 and the container in order to sufficiently take gas from the container into the puffer chamber 11 when the circuit is closed.

(Function) Next, the present invention will be explained in detail with reference to FIGS. 1, 2, and 3. As mentioned above, FIG. 1 shows the initial state of the cutoff operation. In this state, the arc 13 is generating a large amount of heat. In the cut-off state shown in the figure, the hole 5a of the operating rod 5 is still open.

Since the hole 5a does not pass the end 7a of the puffer piston 7, it communicates with the inside of the puffer chamber 11.

On the other hand, at the beginning of such a cutoff, the puffer room 1
The pressure inside 1 has not increased much.

The expanding flow of gas from the arc 13 becomes a flow 12b passing through the hollow part 5b of the operating rod 5, and suddenly flows into the puffer chamber 1.
Flows into 1. 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 inside the puffer chamber 11 becomes even higher.

Thereafter, as shown in FIG. 2, the hole 5a passes through the end 7a of the puffer piston 7 and communicates around it.

Therefore, the hollow portion 5b of the operating rod 5 is open to the surrounding gas, and heat from the arc is released.

The hole 5a takes hot gas into the puffer chamber 11 at the beginning of the cutoff, but exhausts the hot gas after the middle of the cutoff.

Without the cylindrical partition wall 14, this exhausted hot gas would hit the inner surface of the puffer cylinder 6 and cause damage.

This damage reduces the airtightness between the inner surface of the puffer cylinder 6 and the puffer piston 7, making it impossible to sufficiently increase the pressure inside the puffer chamber 11, and causing galling due to increased friction due to uneven sliding. It becomes.

Furthermore, during high-speed dosing operation (so-called O-θ-CO operation), the hot gas from the first cut-off remains near the puffer cylinder, and during the next dosing operation, this hot gas is transferred from the check valve 15 into the puffer chamber 11. Because the gas density in the puffer chamber decreases and the gas is not fresh,
Although the cutting performance may deteriorate at the time of the second cutting,
By providing this partition wall 14, the exhaust gas from the hole 5a of the rod hits this partition wall 14, so not only will the inner surface of the puffer cylinder 6 not be damaged at all, but the partition wall 14 will guide the exhaust gas. On the other hand, at the time of injection, fresh gas 16 is taken into the puffer chamber 11 from the space outside the partition wall through the check valve 15, which greatly reduces the influence of hot gas caused by the initial shutoff operation. This improves performance in the second cutoff operation.

(Other Embodiments) In this embodiment, the puffer piston 7 and the cylindrical partition wall 14 are provided separately.Another embodiment will be described with reference to FIG.

The member 7c supporting the puffer piston 7 is connected to the cylindrical partition wall 1.
4, and has the same shape as the partition wall 14. No notch is provided in the opposing range of the sliding surface 6a of the puffer cylinder, and a notch hole 7b is provided at the base of the puffer piston. By using the support portion 7c also as the partition wall 14, it becomes very economical.

The other components are the same as those in this embodiment.

have the same effect.

〔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.

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

Furthermore, as a result of installing a hot gas protective wall, problems such as galling with the puffer piston due to hot gas being blown onto the inner surface of the puffer cylinder and damaging it do not occur, and during high-speed re-opening and subsequent shut-off operations. Performance deterioration due to hot gas can also be prevented, and as a result, a highly reliable puffer type gas breaker can be provided.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the initial state of the cut-off operation according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the state after the cut-off operation according to the embodiment of the present invention, and FIG. FIG. 7 is a cross-sectional view showing a state in the latter half of the shutoff operation of the embodiment. 1... Fixed contact part 2... Movable contact part 3.
・・Fixed current-carrying contact 4・・Fixed arc contact 5・
...Drive rod 5a...Drive rod hole 5b
... Drive rod hollow part 5c ... Convex part 6 ... Puffer cylinder 6a ... Puffer cylinder inner surface sliding range 7 ... Puffer piston 7a ... Puffer piston end 7b ... Puffer piston cut Notch hole 7c...Puffer piston support portion 7d...Puffer piston bulkhead exterior 8...Movable arc contact 9...Movable current-carrying contact 1
0... Insulated nozzle 11... Puffer chamber 12
...Gas flow 12a, 12b, 12cm hot gas flow 13...Arc 14...Cylindrical partition wall 1
5... Check valve 16... Gas flow agent at the time of injection Patent attorney Nori Chika Ken Yudo Hirofumi Mitsumata Figure 1 Figure 2

Claims (2)

[Claims] (1) A container filled with arc-extinguishing gas has a fixed contact and a movable contact that can be moved in and out, and is driven by a puffer piston provided in the movable contact and an operating rod with a hollow tip. By compressing the puffer chamber, which is made up of a puffer cylinder, the gas in the puffer chamber is compressed and guided to the nozzle, and the gas is blown into the arc that is generated between the fixed and movable arc contacts as the breaker operates. Cooling and extinguishing the applied arc, providing a hole in the hollow part of the operating rod that drives the puffer cylinder, and communicating the hollow part of the operating rod and the puffer chamber through the hole at the initial stage of the breaker operation; In a puffer-type gas breaker configured to isolate the hollow part of the operating rod and the puffer chamber by the puffer piston in the latter half of the shutoff operation, the puffer partition wall is placed on the side opposite to the puffer chamber, and the area near the puffer partition wall is placed on the side opposite to the puffer chamber. A puffer-type gas breaker characterized by being provided with a generally cylindrical member having a small diameter and the diameter of which becomes equal or increases as it gets farther away. (2) the support member of the puffer piston is approximately cylindrical;
The diameter is small near the piston partition wall, and the diameter is the same or increases as it moves away, and the sliding portion on the inner surface of the puffer cylinder that increases the pressure in the puffer chamber while sliding with the outer circumference of the puffer piston is in an open state. 2. The puffer type gas breaker according to claim 1, wherein said puffer piston support member does not have a hole at a position opposite to said puffer piston support member.