JPH0238357Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheath cutter having a plurality of sheath break points.

In recent years, with the increase in demand for electricity, high-voltage disconnectors have come into widespread use. High-voltage breakers are often designed to have multiple points of breakage or disconnection to increase their withstand voltage. Special care must be taken especially from the viewpoint of withstand voltage.

FIG. 1 shows a cross-sectional view of a conventional two-point cutter or disconnector.

The figure shows the closed state of the disconnector.

In the figure, a fixed contact 4,
4, movable contact 5, 5, buffer cylinder 6,
6, pistons 7, 7, and nozzles 8, 8, which are arranged in series with each other via a connector 17. The movable contacts 5,5 are connected via first levers 9,9 to second levers 10,10, and further via third levers 11,11 to a rod 12 on both the right and left sides. One end of the above 12 is connected to an insulating rod 13, and a link mechanism 14
It is connected to the operating mechanism 15 via. In addition,
The shield breakers 2 and 3 are supported by the tank 1 with an insulator (not shown).

The current flows reversibly from the conductor 16 to the sheath breaker 2 to the connecting portion 17 to the sheath breaker 3 to the conductor 8.

When the insulation is cut off, when the operating mechanism 15 operates, the insulating rod 13 moves downward and the second levers 10, 10
rotate in opposite directions about the pins 19, 19, and the movable contacts 5, 5 and buffer cylinders 6, 6 separate from the fixed contacts 4, 4, respectively. At this time, the rod 12 is adapted to perform linear motion by a bearing 20 provided in the connecting part 17, and the movable contacts 5, 5 of the left and right and cut parts 2, 3
The left and right sides move in the same direction in opposite directions. Note that the first levers 9, 9 and the second levers 10, 1
0, third lever 11, 11, and pin 19, 1
9 constitute link mechanisms 21, 21, respectively. Also, when turning on, the operation is the reverse of the above-mentioned turning off.

In this conventional device, the rod 12 had to move linearly in order to slide on the bearing 20. At this time, there is a possibility that stick slip or seizure may occur between the rod 12 and the bearing 20, and there is a risk that metal powder will be generated during this sliding, resulting in voltage breakdown. Furthermore, since the arm portion is provided directly above the insulating rod 13, metal powder tends to adhere to the insulating rod, resulting in extremely poor insulation properties.

The present invention has been devised in view of the above-mentioned drawbacks of the conventional art, and it is an object of the present invention to provide a circuit breaker that is both voltage-resistant and mechanically reliable.

An embodiment of the present invention will be described below with reference to FIG. FIG. 2 is a cross-sectional view of a shingle breaker according to an embodiment of the present invention, and the figure shows the closed state. Note that the same reference numerals in the drawings indicate the same or equivalent parts as in the conventional one.

In the figure, the shingle sections 2 and 3 are supported by the tank 1 by an insulator (not shown). Also, second levers 10, 10, third levers 11, 1
1 to a pin 23 at one end of the fourth lever 22, and the other end of the fourth lever 22 is rotatably supported with the pin 24 as a fulcrum. An insulating rod 13 is connected to the pin 23, and when the operating mechanism 15 operates, the link mechanism 14, the insulating rod 13, the fourth lever 22, the third lever 11, 1
1, second lever 10, 10, first lever 9,
The movable contacts 5, 5 operate simultaneously on the left and right sides via the contact 9. At this time, the pin 23 does not move in a straight line but moves in a circular arc, so the movable contacts 5, 5 of the left and right disconnectors 2 and 3 do not move in the same way. This is not a problem as the difference is made to be very small.

In general, it is known that rotary bearings generate less metal powder due to wear than sliding bearings, and are less prone to phenomena such as stick slip. However, in the link mechanism of this invention, the sliding part Since the rotation angle of the rotating part is extremely small, the generation of metal powder is minimized and its operation is stable. In addition, if metal powder is generated in the live part of the circuit breaker, the metal powder will adhere to the surface of the insulators used inside or the lower part of the tank, changing the electric field distribution or causing the electric field on the surface of the metal powder to become extremely strong. This causes a drop in withstand voltage,
In some cases, this may even lead to internal flashbacks. It is known that this phenomenon is particularly noticeable in gas insulators and disconnectors that use SF ₆ gas as an insulating medium. In addition, stable operation cannot be obtained, and the welding performance deteriorates, making it impossible to shatter. The structure of the present invention is effective only when used in charging parts such as chopsticks and disconnectors.

As described above, according to the present invention, the generation of metal powder in live parts is minimized, and phenomena such as stick slip are minimized, so it has excellent withstand voltage performance and shearing performance, and provides stable opening and closing operations. This has the effect of improving mechanical performance.

The configuration of the present invention can also be applied to disconnectors and the like.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional shingle breaker, and FIG. 2 is a sectional view of a shingle breaker according to an embodiment of the present invention. In the figure, 2 and 3 are cross sections, 4 and 4 are fixed contacts, 5 and 5 are movable contacts, 13 is an insulating rod, 9 and 9 are first levers, and 10 and 10 are second levers. , 11, 11 is the third lever, 22 is the fourth lever
The lever 21 is a link mechanism. Note that the same symbols or corresponding parts are shown in each figure.

Claims (1)

[Scope of utility model registration request] a fixed contact disposed at both ends; a movable contact disposed between the two fixed contacts and each forming a pair with one of the fixed contacts; a pair of first levers that are rotatably connected; a rod made of an insulator that is driven in a direction substantially perpendicular to the operating direction of the movable contact; and one end rotatably attached to one end of the rod; a pair of third levers connected to each other; and a pair of third levers, a part of which is rotatably supported and rotatably connected to the other end of the first lever and the other end of the third lever, respectively. a second lever, and a second lever rotatably connected to one end of the rod and one end of the third lever, the other end of which is pivoted at a position a predetermined distance apart from the connecting portion in the direction of movement of the movable contact. 4. A shingle disconnector characterized in that the contactor is brought into contact with and separated from the contactor by driving the rod.