JPH087764Y2 - Gas insulated switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Use) The present invention relates to a gas-insulated switch in which a disconnecting switch and a grounding switch are housed in the same metal tank.

(Prior Art) In recent years, about 20 years have passed since the gas-insulated switches have been widely applied to substations and switches as one of means for solving site troubles or high-frequency pollution. The gas-insulated switch has a high-voltage conductor part housed in a metal container, and is a SF with excellent insulation performance.
By filling ₆ gas to 3 to ₆ kg / cm ² , the size was greatly reduced. The high-voltage conductor is supported from the required place by an insulating spacer or insulating cylinder made of epoxy resin, but due to reasons such as limiting the scope of accidents for the entire gas-insulated switch and ensuring the quality of the equipment during installation, consider the operational aspects as well. Are classified as gas. Therefore, the so-called insulating spacer not only supports the conductor but also serves as a gas section.

By the way, since the gas-insulated switch has become extremely small,
Very small dimensions between conductor and tank. This is because if the inside of the gas-insulated switch is in a clean state, it has sufficient insulation performance, but if metal dust, etc. remains inside the gas-insulated switch, especially if it remains on the insulating spacers, a small amount will remain. However, it has been known in various studies that a large decrease in insulation performance occurs.

An example of a conventional composite gas insulated switch is shown in FIG.
A single line connection diagram in this case is shown in FIG. As shown in Fig. 3, the disconnector DS,
The grounding switches ES ₁ and ES ₂ are housed in the same tank to reduce the overall size, and the height of the output bushing Bg is kept as high as possible.

Fig. 5 shows the detailed structure of the disconnecting switch and the ground switch. A fixed side contact part 2 and a movable side contact part 3 of a disconnector are provided in a metal tank 1 supported by insulating spacers 13 and 14, respectively, and a movable contactor 4 which opens and closes between both contact parts is provided.
A pinion rack mechanism 5 is incorporated in the movable contactor 4, and an insulating operating rod 6 made of epoxy resin is installed from the metal tank side.
It is incorporated so that the movable contactor 4 can be opened and closed by rotationally driving. The other end of the insulating operation rod 6 has its main shaft led out of the metal tank via a seal box 7 and connected to an operation device provided outside.

The fixed side contact part 2 of the disconnector is provided with the fixed side contact part 8 of the grounding switch ES ₁ , and an opening / closing mechanism 9 for driving the movable contact 16 is attached to the tank 1 at a position facing the fixed side contact part 8. on the other hand,
The movable side contact part 3 of the disconnector is provided with the fixed side contact part 10 of the earthing switch ES ₂ , and the movable contact 11 and the opening / closing mechanism 12 are provided on the tank 1 at a position opposite to this, similarly to the earthing switch ES _1. It is installed.

The earthing switches ES ₁ and ES ₂ are arranged on both sides of the disconnecting switch DS, but their function is different, and the earthing switch ES ₂ is normally grounded when checking the gas breaker GCB. It is for. The grounding switch ES ₁ is operated when grounding an overhead power transmission line connected to the end of the outlet bushing Bg, and is generally called a line grounding switch. In Japan, two overhead lines are normally operated as an overhead transmission line, and two substations are interconnected by two transmission lines. Even if one line is stopped for cleaning insulators, the remaining one line is used. Consideration is given so that electric power can be sent without any trouble.

In the case of such a two-line combination, if one line is stopped and the earthing switch ES ₁ is turned on, a load current equivalent to the rated current will flow in the other line. % Induced current flows through the earthing switch ES ₁ . Therefore, when this grounding switch is opened, about 12% of the load current flowing in the healthy phase line, which is normally 400A to 1500A, is cut off.

(Problems to be solved by the device) In general, for the earthing switch for line ES ₁ , a device that has been considered and verified to have the required breaking performance in consideration of the above-mentioned usage conditions is applied, but At the time of interruption, an arc is generated between the poles and the interruption dust falls downward. As shown in FIG. 5, a conventional disconnector,
If it is arranged like a grounding switch, dust 15 generated at the time of current interruption may fall downward and be deposited on the lower insulating spacer 14 to impair the initial insulating performance of the insulating spacer 14.

The same applies to the insulation operating rod 6 of the disconnector,
As shown in the figure, if priority is given to operability or checkability, and if the direction of the earthing switch ES ₁ and the disconnecting switch DS to the atmosphere side is the same direction, it is directly under the switching contact of the earthing switch for line ES _1. Insulation operating rod 6 will be installed on the ground switch
The blocking dust 15 of the ES ₁ may fall on top of this and cause deterioration of the insulation performance.

The purpose of this plan is to prevent the blocking dust generated when the grounding switch blocks the induced current from accumulating on the insulator.
An object of the present invention is to provide a gas-insulated switch in which the arrangement of insulators is changed so that the initial insulation performance of the equipment is ensured during actual use.

[Constitution of device]

(Means for Solving the Problems) In the gas-insulated switch of the present invention, the disconnecting switch and the grounding switch are housed in one metal tank, and the operating direction of the disconnecting switch movable contact is the vertical direction. And in a gas-insulated switch arranged so that the insulation operating rod for driving and operating the disconnector movable contactor is orthogonal to the operating direction of the disconnector movable contactor, wherein the lower conductor of the disconnector is the metal tank. While being supported by an insulating spacer provided at a position recessed from the inner side surface of the, the positions of the movable contacts of all the earthing switches located above the insulating operation rod are orthogonal to the operating direction of the disconnector movable contact. It is characterized in that it is provided at a position where an angle formed by a position projected on a plane including the insulating operation rod and the insulating operation rod is 90 ° or more.

(Operation) In the present invention, since the insulating spacer for supporting the lower conductor of the disconnector is provided at a position recessed from the inner side surface of the metal tank, the blocking dust generated in the ground switch does not accumulate on the insulating spacer. In addition, since the insulation operating rod of the disconnector is also located at a position 90 ° or more away from the contact of the earthing switch of the earthing switch, blocking dust will not accumulate.

(Embodiment) The present invention will be described with reference to an embodiment shown in FIGS. 1 and 2. In FIGS. 1 and 2, the same reference numerals as those in FIGS. 3 and 5 indicate the same parts, and thus the description thereof will be omitted. First, referring to FIG. 1, the disconnecting switch DS, the grounding switches ES ₁ and ES ₂ which compose the gas-insulated switch according to the present invention.
And the basic components of the gas breaker GCB are the same as the conventional ones.

In the gas-insulated switch of the present invention, the movable contact portion 3 of the disconnector DS is supported by the insulating spacer 17 provided at the branch portion 19 on the side surface of the metal tank 1. This insulating spacer 17
Is arranged so as to be recessed from the main body of the metal tank 1 so that the breaking dust of the grounding switch ES ₁ does not hit even if it falls from above, and it also separates the gas from the gas breaker GCB. Has become. Further, in the present invention, the insulating operation rod 6 of the disconnecting switch DS is arranged at a position displaced by 90 ° or more (opposite position in the drawing) with respect to the position of the contact portion of the earthing switch ES ₁ so as to prevent cutting dust from reaching. I have to.

In the gas-insulated switch of the present invention configured as described above, in actual use, even if the cutting dust is generated by the arc when the induced current is switched by the ground switch ES _{1, the} dust is deposited on the insulating spacer 17. Since it does not exist and falls to the low electric field portion at the bottom of the metal tank 1 below, the deterioration of the insulation performance of the device due to the generation of dust can be completely eliminated.

Moreover, nowadays, power systems are becoming increasingly important,
It is the most important condition for substation equipment not to cause a power failure. In the present invention, the earthing switch ES ₁ and the disconnecting switch DS
It is possible to provide a device in which the reliability of the device is sufficiently ensured and the insulation performance at the initial stage of installation is maintained as it is, though the checkability due to the fact that the arrangement relationship with is not in the same direction is somewhat troublesome. This is extremely effective in consideration of the social mission of substation equipment.

In addition, in the other embodiment shown in FIG. 2, the disconnector DS
The movable side contact portion 3 is supported from the bottom of the metal tank 1 by the insulating cylinder 18, and the same effect can be obtained by this configuration.

[Effect of device]

As described above, according to the present invention, the conductor on the lower side of the disconnector is supported by the insulating spacer attached at the position recessed from the side surface of the metal tank, and at the same time, the movement of all earthing switches located above the insulating operation rod is movable. The position of the contactor is orthogonal to the operating direction of the disconnector movable contactor, and the angle formed by the insulating operation rod and the position projected on the plane including the insulating operation rod is set to 90 ° or more. The initial performance level of the insulation performance of the device can be secured without the metal dust generated when the ground switch interrupts the induced current, accumulating on the insulation spacer or the insulation operation rod.

[Brief description of drawings]

1A and 1B are a front view and a side view showing an embodiment of a gas-insulated switch of the present invention by cutting out a main part thereof, and FIG. 2 is a view of another embodiment of the present invention by cutting out a main part. Front view, FIG. 3 is a front view of a conventional gas-insulated switch with a main part cut off, FIG. 4 is a single wire connection diagram of the gas-insulated switch, and FIG. 5 is an enlarged cross-sectional view of the main part of FIG. is there. DS …… Disconnector, DCB …… Gas breaker ES ₁ , ES ₂ …… Grounding switch, 1 …… Metal tank 2 …… DS fixed side contact part, 3 …… DS movable contact 4 …… DS movable Side contactor, 6 ... Insulation operating rod 8 ... ES ₁ Fixed side contact part, 10 ... ES ₂ Fixed side contact part 11 ... ES ₂ Movable contact part, 13, 14 ... Insulation spacer 15 ... Dust

Claims (1)

[Scope of utility model registration request] 1. A disconnector and a grounding switch are housed in a single metal tank, and the movable contact of the disconnector is operated in a vertical direction, and the movable contact of the disconnector is driven and operated. In the gas-insulated switch in which the insulating operating rod is arranged so as to be orthogonal to the operating direction of the disconnector movable contactor, the lower conductor of the disconnector is provided by an insulating spacer provided at a location recessed from the inner surface of the metal tank. While supporting, the positions of the movable contactors of all the earthing switches located above the insulating operation rod are orthogonal to the operating direction of the disconnector movable contactor, and the positions projected on a plane including the insulating operation rod and A gas-insulated switch characterized in that it is installed at a position where the angle formed by the insulated operating rod is 90 ° or more.