JPS6119021A - Buffer type gas 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 [Field of Application of the Invention] The present invention relates to a Patsubua type gas circuit breaker, and particularly to a circuit breaker suitable for achieving high voltage and large current per circuit break point.

[Background of the invention]

A puffer type gas circuit breaker has a puffer chamber formed by a piston and a cylinder in a container filled with arc-extinguishing gas at a single pressure, and a contactor is connected to one of the two to adjust the volume of the puffer chamber. It is configured to reduce the size of the contact and separate the contacts.

Arc-extinguishing gas compressed by reducing the volume of the puffer chamber is guided through an insulating nozzle, and is sprayed against the arc generated by the disconnection of the contacts, thereby interrupting the current in the circuit.

1st. FIG. 2 shows a puffer-type gas circuit breaker of a type in which both the first contact and the second contact are driven in conjunction with the operation of the puffer cylinder, which is disclosed in Japanese Patent Application Laid-open No. 89457/1983. It is something. FIG. 1 shows a cut-off part in a closed state, and FIG. 2 shows a cut-off part in a cut-off state in a vertical cross-sectional view.

The first contact 1 includes a movable tube 2 and an insulator operating rod 3.
It is driven by an operating device (not shown) via the . On the other hand, the second contact 4 includes a rotary lever 7 rotatably supported by a spindle 6 provided on the conductor 5 which is fixed in position, an insulating rod 8 provided between the poles, and an insulator rod 8 which is fixed in position. It is connected to the insulator operating rod 3 via a rotary lever 11 rotatably supported by a support part 10 provided on the conductor 9, and is driven in the opposite direction to the operation of the first contactor 1.

A puffer cylinder 12 is integrally formed with the movable tube 2 and forms a puffer chamber 14 with a puffer piston 13 fixed to the conductor 9. An insulator cover 15 and an insulator nozzle 16 that surround the first contact and form a gas flow path communicating with the puffer chamber 14 are fixed to the puffer cylinder 12 .

Here, 17 and 18 are insulator support cylinders, and 19 and 20 are current collectors.

In the interrupting section configured in this way, the current flows through the conductor 5,
The fluid flows through the second contact 4, the first contact 1, the movable tube 2, and the conductor 9 to bushings (not shown).

The shutoff operation will be explained with reference to FIG. When the operating device operates in response to a cutoff command, the movable tube 2. Movable parts such as the puffer cylinder 12, the first contact 1, and the insulator nozzle 16 move downward as shown. At the same time, the second contactor 4 is moved to the insulator rod 8 by the rotary lever 11 connected to the insulator operating rod 3.
, is driven via the rotary lever 7 in the opposite direction to the moving direction of the first contactor 1. Along with these operations, the arc-extinguishing gas in the puffer chamber 14 is compressed. This arc-extinguishing gas is
Guided by an insulator nozzle 16 and an insulator cover 15,
Further, when the breaking operation progresses, the arc 21 caused by the separation between the contacts 1 and 4 is blown. This spray extinguishes the arc and breaks the circuit. In the process of the interrupting operation, the arc-extinguishing gas that has contributed to extinguishing the arc is heated to a high temperature and released into the external space 22.

In such a puffer type gas circuit breaker that drives both contacts 1 and 4, the second contact 4 is fixed and the first
Compared to ordinary puffer-type gas circuit breakers that drive only the contacts, this is suitable for increasing the voltage per breaking point because the distance between poles can be expanded. However, the insulator rod 8 provided between the poles to operate the second contactor 4 was directly exposed to the high temperature gas flow 23 that contributed to extinguishing the arc and was damaged, as shown in FIG. This caused problems in terms of electrical and mechanical reliability.

FRP is used as the material for the insulator operating rod due to its mechanical strength. However, if the arc-extinguishing gas is SF or gas, the decomposing acid organisms generated during arc-extinguishing will chemically cause FR.
A decomposition-resistant adult coating is applied to the P surface to prevent corrosion. However, direct exposure to high-temperature gas may cause the coating to peel off, resulting in corrosion of the FRP surface. These lead to a decrease in the electrical insulation performance and mechanical strength of the insulator rod 8.

Damage to the insulator operating rod 8 due to high temperature gas.

High voltage,
This was a problem that had to be solved when it came to Daikichiro.

[Purpose of the invention]

An object of the present invention is to provide a puffer type circuit breaker suitable for high voltage and large current per one breaking point.

[Summary of the invention]

In response to higher voltages per breaking point, a twin movable contact method is used that allows the conventional fixed contact to move in order to increase the separation distance during breaking operation and improve the dielectric strength when the contact gap is fully open. A cut-off part is suitable. However, when dealing with large currents, damage to the insulating rods provided between the poles due to high-temperature gas was a problem with the present invention.

The aim is to achieve high voltage and large current by configuring the insulator so that high temperature gas does not directly hit the insulator operating rod.

In other words, the present invention includes a pressure generating section consisting of a puffer cylinder and a puffer piston in a container filled with arc-extinguishing gas at a single pressure, a first contact provided on the puffer cylinder side, and an insulating material from the puffer cylinder side. A first contact and a separable second contact are provided which are connected via a rod, and the second contact is also driven in conjunction with the operation of the pressure generating portion and the first contact, In a puffer-type gas circuit breaker that sprays arc-extinguishing gas from a pressure generation part against the arc that occurs when the first contact and the second contact open, the arc-extinguishing property after being blown onto the arc is A shielding member is provided to prevent gas from directly hitting the insulating rod.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 3 to 9. Components common to those in the prior art are designated by the same numbers.

3 and 4 show an embodiment of the present invention, which differs from the prior art example in that shielding plates 24 and 25 are respectively provided at the portions of the insulating rod 8 that are exposed to the high-temperature gas flow 23. Third
The figure shows the shielding plate 24 attached to the conductor 5, and FIG.
A shielding plate 25 is attached to the insulator operating rod 8. FIG. 5 shows a cross-sectional view of the shielding plate 24 and 25 portions of FIGS. 8 damage can be prevented.

FIG. 6 shows yet another embodiment of the invention.

Further, FIG. 7 is a sectional view of the puffer cylinder 12 portion of FIG. 6. Insulator tubes 26 and 27 are provided between the electrodes to support and fix the conductor 5, and a capacitor 28 for voltage sharing or for suppressing re-electromotive voltage is disposed inside the insulator tubes 26 and 27. In this embodiment, a hole 29 is provided in an insulating tube 27, and an insulating rod 8 is placed inside the hole 29. This structure also prevents the insulating rod 9 from being damaged by high-temperature gas. .

FIG. 8 shows still another embodiment of the present invention, which is a sectional view of the puffer cylinder 12, similar to FIG. 7. In this embodiment, the insulator rod 8 is arranged outside the insulator tube 27, and the same effect as in the embodiment shown in FIG. 6 is obtained.

FIG. 9 shows a further embodiment of the invention, which is a sectional view of the puffer cylinder 12, similar to FIG. 7.8. In this embodiment, an insulating cylinder 29 surrounding the entire circumference of the interrupting part is provided,
Insulator rods 8 are placed outside the 6th and 7th rods.
It has the same effect as shown in the figure.

As described above, by configuring the insulator rod 8 so that the high-temperature gas that contributed to extinguishing the arc does not directly hit the insulator rod 8, damage to the insulator rod 8 can be prevented, and the electrical insulation performance and mechanical It becomes possible to obtain a blocking portion without a decrease in strength.

〔Effect of the invention〕

According to the present invention, even if the breaking current increases, it is possible to eliminate the decrease in the electrical insulation performance and mechanical strength of the insulating rod 8 due to the high temperature gas that contributed to extinguishing the arc. This has the effect of achieving high voltage and large current per point.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the closing state of a puffer type gas circuit breaker which is an example of the prior art, FIG. 2 is a vertical cross-sectional view showing the shut-off operation of FIG. 1, and FIGS. FIG. 7 is a sectional view of the puffer cylinder portion of FIG. 6, and FIGS. 8 and 9 are views of still another embodiment of the puffer type gas circuit breaker of the invention. It is a sectional view of a puffer cylinder part. 1... First contactor, 2... Movable tube, 4... Second
8... Insulator rod, 12... Puffer cylinder. 13... Puffer piston, 27... Insulator cylinder, 2
9...Insulator cylinder.

Claims (1)

[Claims] 1. A pressure generating part consisting of a puffer cylinder and a puffer piston is placed in a container filled with arc-extinguishing gas at a single pressure, a first contact provided on the puffer cylinder side, and an insulating rod from the puffer cylinder side. a second contact that is connected to the first contact and is releasable; the second contact is also driven in conjunction with the operation of the pressure generating section and the first contact; In a puffer-type gas circuit breaker that sprays arc-extinguishing gas from a pressure generating part against the arc that occurs when the contact and the second contact open, the arc-extinguishing gas after being blown on the arc is A puffer type gas circuit breaker characterized by having a shielding member installed to prevent direct contact with the insulator rod.