JPS6256614B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grounding device for a gas insulated switchgear, and more particularly to a grounding device with a resistive contact for discharging residual charges of a cable transmission line.

FIG. 1 shows a prior art contact device.

A high voltage bus conductor 3 is housed in a grounded container 1 in which pressurized SF ₆ gas 2 is sealed. A grounding device container 13 insulated from the grounding container 1 by an insulating plate 14 is attached, and both containers are electrically connected by a conductor 15. In the grounding device container 13, a movable contact 5 is moved by the operating mechanism section 7, and the small diameter portion 5a at the tip of the movable contact 5 contacts the fixed contact 4 provided on the bus conductor 3 to ground the bus conductor 3. . During the operation process of the movable contact 5, at the moment when the small diameter portion 5a at the tip comes into contact with the fixed contact 4, the movable contact 5 does not come into contact with the grounding contact 12 and is sufficiently insulated, and is also in contact with the operating mechanism section 7. It is insulated by an insulator 6. Further, since the resistor contact 8 is always insulated by the insulator 9, the bus conductor 3 includes the movable contact 5a, the resistor contact 8, the connecting conductor 10, the resistor 11, the grounding device container 13, and the conductor. It is grounded through 15.

When earthing cable power lines connected to gas-insulated switchgear, the residual voltage in the cable is 100
Since the voltage is applied from the bus conductor 3 to the high voltage side of the resistor 11, each component maintains sufficient insulation. When the movable contact 5 completes its operation, it is completely inserted into the fixed contact 4, and the large diameter portion 5b of the movable contact comes into contact with the grounding contact 12, so that the bus conductor 3 is directly grounded.

The disadvantage of conventional grounding devices with resistance contacts is that they rely on the gas space between the small-diameter tip of the movable contact and the grounding contact to withstand residual voltage, making insulation difficult; The problem is that the contact and the resistor are connected by the connecting conductor 10, resulting in a complicated structure.

The present invention overcomes the drawbacks of the prior art and provides a grounding device with a resistive contact that has a simple structure and has a certain level of insulation performance.

The present invention simplifies the structure by insulating and supporting the parts of the cable to which the residual voltage is applied together using post insulators.

FIG. 2 shows an embodiment of the present invention.

The movable contact 5 has a small diameter part 5a on the tip side and a large diameter part 5b on the rear side, and an insulator 9 is inserted between these parts.
are connected by.

As shown in FIG. 3, the small diameter portion 5a of the movable contact 5
At the moment when the tip of the movable contact 5 contacts the fixed contact 4 and a residual voltage is applied, the large diameter portion of the movable contact 5 is located away from the contact 17 and the insulator 19
insulated by.

Further, since the conductor 16 is also insulated by the insulator 9, the residual charge is grounded and discharged from the fixed contact 4 via the movable contact 5a, the resistor contact 8, the conductor 16, the contact 18, and the resistor 11. .

When the movable contact 5 is completely closed, the insulator 19 enters the recess provided in the conductor 16 as shown in FIG. 3 indicates a fixed contact 4, a small diameter portion of a movable contact 5a, a conductor 16, a contact 17, a movable contact 5, and a ground contact 12.
connected directly to ground.

According to the present invention, since the insulation is provided by the insulator 9, the structure is simple and a constant dielectric strength can be obtained, and the conductor 1 supported by the insulator 9
Since a recessed portion for storing the insulator 19 is formed in 6, the conductor 16 can be made lightweight, and the grounding device container 13 can be made lighter.
The axial length of can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional grounding device, FIG. 2 is a sectional view of a grounding device showing an embodiment of the present invention, FIG. 3 is a sectional view showing the closing operation process of FIG. FIG. 3 is a sectional view showing the fully loaded state of FIG. 2; DESCRIPTION OF SYMBOLS 1... Earthing container, 3... Bus conductor, 5... Movable contact, 5a... Small diameter part, 5b... Large diameter part, 9...
...Insulator, 11...Resistor, 13...Grounding device container, 16...Conductor, 19...Insulator.

Claims (1)

[Claims] 1. A high voltage bus conductor is housed in a grounding container filled with highly insulating gas, a grounding device container is provided which is insulated from the grounding container, and a movable contact is provided in the grounding device container, When the movable contact element contacts a fixed contact provided on the bus conductor to perform a grounding operation, the bus conductor is grounded through a resistor and then the bus conductor is directly grounded. A conductor supported by a first insulator is provided, and the movable contact has a small diameter part at the tip side and a large diameter part at the rear, and these are connected by a second insulator. The conductor supported by the first insulator is provided with a recess into which the second insulator of the movable contact fits, and a recess connected to the resistor and in contact with the small diameter portion. A pair of contacts are provided on the conductor and the grounding device container, and the small diameter portion of the movable contact is connected to the bus bar. When the movable contact is brought into contact with a fixed contact of the conductor, it is grounded through the resistor, and when the movable contact is fully closed, the large diameter portion bridges the pair of contacts and directly grounds the contact. Grounding device with resistance contact. 2. The grounding device with a resistive contact according to claim 1, characterized in that a post insulator is used as the insulator. 3. A device with a resistance contact according to claim 2, characterized in that a resistor is electrically connected at one end to the conductor by a contact that facilitates attachment and detachment of the resistor on substantially the same circumference as the post insulator. .