JPH03252014A - Buffer type gas circuit breaker - Google Patents

Abstract

PURPOSE:To prolong an electrical and mechanical lifetime and improve a breaking characteristic by connecting one end of each of connecting rods to an operating rod on a movable side and the rear end of an operating rod on an opposite side by means of a pair of insulative rods. CONSTITUTION:In a buffer type gas circuit breaker where an operating rod 13 on a movable side and an operating rod 19 on an opposite side are simultaneously driven by a single driver 1, the driver 1 is disposed outside of the side surface of a gas container 2. The driver 1 is connected to the rear end of the operating rod 13 on the movable side and the rear end of the operating rod 19 on the opposite side by a pair of connecting rods 9, 23 which are connected on each one end thereof to the driver 1 and arranged along the side wall of the gas container 2 in the axial direction, and a pair of insulative rods 11, 21 interposed between the other end of each of the connecting rods 9, 23, and each rear end of the operating rods 13, 19 on the movable and opposite sides, respectively. Therefore, it is possible to prevent any damage of the insulative rods 11, 21 and the connecting rods 9, 23 due to an arc generated at the time of breaking so as to improve a breaking characteristic and prolong an electrical and mechanical lifetime.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a buffer type gas circuit breaker.

(Prior Art) In FIG. 5 showing a vertical cross-sectional view of the arc extinguishing chamber of a conventional buffer type gas circuit breaker, the right ends of a pair of support columns 26a are fixed to the left end of the movable support insulating cylinder 3 at the right end. This support 26a
The middle of a band-shaped lever 26b is swingably connected to the left end of the lever 26b via a pin, and the right end of a link 26c is connected to the right end of this lever 26b via a bottle. A middle portion of the movable operating rod 13 is connected to the movable operating rod 13, and a right end (not shown) of the movable operating rod 13 is connected to a drive device (not shown).

The left end of the movable operating rod 13 has a tubular shape, and the bottom of a buffer cylinder 15 having an inverted U-shaped cross section is fixed to the left end of the tubular part, and an arc extinguishing chamber is provided on the left side of the center. A protruding movable side electrode 6 is provided at 28, and a buffer cylinder 15 is provided around the base end of this movable side electrode 16.
A plurality of through holes 16a are provided at the bottom of the through hole 1.
Further outside 6a, the bottom of a substantially cylindrical insulating nozzle 17 is fixed to the left of the bottom.

On the other hand, a buffer piston 14 is inserted into the buffer cylinder 15, and the right end of the buffer piston 14 is fixed to the left end of the movable supporting insulating cylinder 3.

Furthermore, a link 26 is attached to the left end of the lever 26b via a pin.
The right end of the link 26d is connected to the right end of the link 26d, and the right end of an insulating rod 27 made of glass fiber reinforced plastic is connected with a pin, and the end plate 1 is connected to the left end of the insulating rod 27.
8a is fixed, and the base end of the opposing electrode 18 is fixed to the right side surface of the central part of the end plate 18a.

The end plate 18a is supported by the supporting insulating cylinder 4 on the left side thereof.

Now, in the buffer type gas circuit breaker with the arc extinguishing chamber configured in this way, when the right end of the opposing electrode 18 is fitted to the movable electrode 16 and the circuit breaker is closed, first the driving device (not shown) is connected. to move the movable side operating rod 13 to the left side, and move the movable side electrode 1 together with the buffer cylinder 15.
6. Push out the nozzle 17 to the left. Then, as the movable operating rod 13 moves leftward, the right end of the lever 26b is also pulled leftward by the link 26C, which is driven leftward, causing the upper link 26b to move clockwise and the lower link to move clockwise. 26b respectively swing counterclockwise, and as a result, the insulating rod 27 is driven rightward via the link 26d. Then, the opposing electrode 18 is pushed by the end plate 18a and driven rightward, and at the same time, the tip fits inside the movable electrode 16, which is driven leftward, and is attached to the outer periphery of the movable electrode 16. It is pressurized with a predetermined pressure by a pressure spring (not shown).

On the other hand, when performing a disconnection operation to pull out the fitted movable side electrode 16 and opposing side electrode 18, the movable side operating rod 13 is driven to the right by driving a drive device (not shown), and the buffer cylinder 15 is At the same time, the movable electrode 16 and nozzle 17 are moved rightward.

Then, with the movement of the movable operating rod 13, the link 25c moves to the right, and the inside of the link 26b swings to the right. As a result, the left side of the link 26b swings to the left, causing the link 26d to swing. The insulating rod 27 is driven to the left through the insulating rod 27, and the opposing electrode 18 is driven to the left through the end plate 18a to be pulled out from the movable electrode 16 at high speed.

As the buffer cylinder 15 moves to the right during this shutoff operation, the insulating gas in the buffer chamber 25 formed by the bottom of the buffer cylinder 15 and the left end of the buffer piston 14 is compressed and flows through the first through hole 16a. Movable side electrode 1
6. The arc generated during spraying at the tip of the nozzle 17 is elongated and extinguished.

(Problem to be Solved by the Invention) However, in a buffer type gas circuit breaker having such a configuration, the surface of the insulating rod 27 is carbonized by the arc accompanying current interruption, which not only deteriorates the dielectric strength but also causes contact Insulating rod 2 damaged by an arc during the drive for insertion and removal of parts
There is a risk that the strength of No. 7 will decrease.

Therefore, it may be possible to use inorganic materials, but this would improve electrical properties, but would have the disadvantage of reducing mechanical impact.

Furthermore, if the mechanical strength is increased by increasing the diameter, the weight will increase by 1, reducing the opening speed and possibly lowering the blocking characteristics.

Therefore, the purpose of the present invention is to have a long electrical and mechanical life, and
An object of the present invention is to obtain a buffer type gas circuit breaker with excellent shutoff characteristics.

[Structure of the invention]

(Means and effects for solving the problems) The present invention provides a movable side electrode at the tip of a movable side operating rod and an opposing side electrode at the tip of an opposing side operating rod that comes into contact with and separates from the movable side operating rod. In a buffer type gas circuit breaker that is carefully installed and in which the movable side operating rod and the opposite side operating rod are simultaneously driven by one drive device, the drive device is installed outside the side of the gas container, and this drive device and the movable side operating rod are driven simultaneously by one drive device. A pair of connecting rods, one side of which is connected to a drive device and arranged axially along the side wall of the gas container, are connected between the rear ends of the rear end and the opposite side operating rod, and the other end of this connecting rod and the movable side operating rod. By connecting with a pair of insulating rods arranged between the rear ends of the operating rods and the opposite operating rods, it prevents damage to the insulating rods and connecting rods due to arcing during interrupting, and has good interrupting characteristics and long electrical and mechanical life. It is an extended buffer type gas circuit breaker.

(Example) Hereinafter, an example of the buffer type gas circuit breaker of the present invention will be described with reference to the drawings. However, parts that overlap with Fig. 5 are omitted.

FIG. 1 is a longitudinal cross-sectional view showing the main contact portion and its operating portion of the buffer type gas circuit breaker of the present invention.

In the same figure, there are branch outlets 2ax * 2a on the left and right sides of the top surface.
A buffer piston 14 is fixed coaxially to the left end of a cylindrical movable support insulating cylinder 3 which is coaxially fixed to the right end of a cylindrical gas container 2 provided with a buffer piston 14, as in the conventional case. At the left end of 14, there is also a buffer cylinder 15, a movable electrode 16, and a nozzle 17, as in the conventional case.
is disposed, and the lower end of the movable conductor 5, which is drawn in from the rising portion 2a above the buffer piston 14, is fixed to the upper surface of the right end of the buffer piston 14.

Further, a cylindrical opposing supporting insulating tube 4 is fixed coaxially to the left end of the gas container 2, and the base end of a fixed current-carrying contact 4a is fixed to the right end of the opposing side supporting insulating tube 4. The lower end of the opposing conductor 6, which is drawn in from the sunrise portion 2a1 above, is fixed to a spring plate (not shown) wound around the outer periphery of the contactor 4a.

Further, an opposite movable current-carrying contact 18a having an inverted U-shape is fitted into the inner right end of the fixed current-carrying contact 4a so as to be movable left and right, with its outer periphery contacting the contact portion inside the right end of the fixed current-carrying contact 4a. An opposing electrode 18 is fixed to the center of the opposing movable energizing contact 18a, and an opposing operating rod 19 protrudes from the left side of the opposing movable current-carrying contact 18a. The upper end of an L-shaped link 20 is connected to the left end of the rod 19 via a pin.

In addition, a case 1 having a U-shaped cross section is located at the center of the lower end of the gas container 2.
A drive device 11 (details omitted) is housed in the case la, and an L-shaped first link 8 on the movable side and a first link on the opposite side are attached to the upper end of the drive rod 7, which is the pressure axis of this drive device. The lower end of the link 24 is connected, and the left end of a movable connecting rod 9 of a steel bar layer provided along the inner surface of the gas container 2 is connected to the upper end of the rightmost movable first link 8. The left end of the L-shaped movable second link 10 is connected to the right end of the movable side connecting rod 9, and the right end of the movable second link 10 is an insulating rod that vertically penetrates the lower left end of the movable side support insulating cylinder. The lower end of the insulating rod 11 is connected to the lower end of the L-shaped movable third link 12, and the upper end of the movable third link 12 is connected to the right end of the movable operating rod 13. ing.

Similarly, the right end of the opposite connecting rod 23 of the steel bar layer provided along the inner surface of the gas container 2 is connected to the upper end of the L-shaped opposite link 24 on the left side of the upper end of the drive rod 7. The left end of this opposing connecting rod 23 is connected to the right end of an L-shaped opposing second link 22, and the lower end of the movable insulating rod 21 is connected to the left end of this opposing second link 22. The upper end of the side insulating rod 21 is connected to the lower end of the L-shaped opposing third link 20 described above.

In the buffer type gas circuit breaker configured in this way,
Now, when turning on the circuit breaker, the drive unit! 1 and drive rod 7 upward in the direction of arrow A shown in FIG.

Then, as the first link 8 on the movable side swings clockwise, the connecting rod 9 on the movable side is driven to the right as shown by arrow B, and the second link 10 on the movable side swings counterclockwise to move the insulator on the movable side. The rod 11 is driven upward as shown by arrow C, the movable third link 12 is swung counterclockwise, and the movable operating rod 13 moves as shown by the arrow along with the movable electrode 16° nozzle 17 and buffer cylinder 15. is driven to the left.

On the other hand, as the connecting rod 7 is driven upward, the first link 24 on the opposite side swings counterclockwise, and as a result, the connecting rod 23 on the opposite side is driven to the left as shown by arrow E, and the second link on the opposite side swings counterclockwise. 22 is swung clockwise.

Further, the opposing insulating rod 21 is driven upward as indicated by arrow F, the third link 20 on the opposing side is swung clockwise, the opposing electrode 18 is driven rightward, and the above-mentioned movement moves leftward. It is fitted inside the driven movable side electrode 16.

On the other hand, when the inserted buffer type gas circuit breaker is to be operated to shut off, the connecting rod 7 is driven downward as shown by the arrow H in FIG. , L, and the opposite side is driven as shown by arrows M, N, and P to open the contact portion.

In the buffer type gas circuit breaker configured in this way, the movable side insulating rod 11. Since the opposing insulating rod 21, the movable connecting rod 9, and the opposing connecting rod 23 are not exposed to the arc during interruption, the movable insulating rod 11 and the opposing insulating rod 21 do not deteriorate, and the movable side is shorter than before. Connecting rod9. The connecting rod 23 on the opposite side is made of a thin but strong steel rod, so it not only provides a buffer type gas circuit breaker with a long electrical and mechanical life, but also allows both the insulating rod and the connecting rod to be short and thin. , lightweight,
As a result, the operating speed of the drive device 1 becomes faster, so that a buffer type gas circuit breaker with excellent interrupting characteristics can be obtained.

FIG. 4 shows another embodiment of the buffer type gas circuit breaker of the present invention.

In the figure, since the movable side connecting rod 9 and the opposing side connecting rod 23 are arranged outside the gas container 2, the buffer type gas circuit breaker has even better ground insulation properties.

〔Effect of the invention〕

As described above, according to the present invention, the movable-side electrode at the tip of the movable-side operating rod and the opposing electrode at the tip of the opposing-side operating rod that comes into contact with and separates from the movable-side operating rod are provided at the axis in the gas container, and are movable. In a buffer type gas circuit breaker in which the side operating rod and the opposite side operating rod are simultaneously driven by one drive device, the drive device is provided outside the side of the gas container, and this drive device and the rear end of the movable side operating rod and the opposite side operation are connected to each other. A pair of connecting rods are connected between the rear ends of the rods, one side of which is connected to the drive device and arranged meticulously along the side wall of the gas container, and the other end of this connecting rod with the movable side operating rod and the opposite side operating rod. Since it is connected by a pair of insulating rods placed between the rear ends, it prevents damage to the insulating rods and connecting rods due to arcing during disconnection, and is lightweight, resulting in a long electrical and mechanical life and excellent disconnection characteristics. A buffer type gas circuit breaker can be obtained.

[Brief explanation of drawings]

FIG. 1 is a partial longitudinal cross-sectional view showing an embodiment of the buffer type gas circuit breaker of the present invention, and FIGS. FIG. 4 is a partial vertical sectional view showing another embodiment of the buffer type gas circuit breaker of the present invention, and FIG. 5 is a vertical sectional view showing the main parts of a conventional buffer type gas circuit breaker. 1... Drive device 2... Gas container 9°...
Movable side connecting rod 11... Movable side insulating rod 13.
...Movable side operation rod 19...Opposite side operation rod 2
1... Insulating rod on the opposite side 23... Connecting rod on the opposite side Fig. 1 (8733) Agent Patent attorney Yoshiaki Inomata (1 person) No. 2 At the time of installation Fig. At the time of old shutoff Fig.

Claims (1)

[Claims] The movable side electrode at the tip of the movable side operating rod and the opposing side electrode at the tip of the opposing side operating rod that comes into contact with and separates from this movable side electrode,
In a buffer type gas circuit breaker, which is provided at the axis of the gas container, and in which the movable operating rod and the opposing operating rod are simultaneously driven by one drive device, the drive device is provided outside the side surface of the gas container. , between this drive device, the rear end of the movable side operating rod, and the rear end of the opposite side operating rod,
a pair of connecting rods, one end of which is connected to the drive device and disposed in the axial direction along the side wall of the gas container; the other end of the connecting rod, the movable operating rod, and the opposing operating rod; A buffer type gas circuit breaker characterized by being connected by a pair of insulating rods arranged between rear ends.