JPS5897227A - SF↓6 gas disconnector - 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 The present invention-1 S used as an ultra-high voltage (UHV) disconnector
Fm related to gas disconnector.

The 1100KV or higher 0UHV disconnector is different from the 550Kv or lower disconnector! #Requires a resistor for suppressing surge voltage when the voltage between the poles of the T path is cut off. tfc.

2000 of the 550KV system also in the loop 'It flow value.
~6000A, while the UHV disconnector is 12000A
is required.

Figures 1 and 2 show an example of the disconnection section structure of an 8F/new circuit unit, which is a conventional UHVIIT circuit unit.
1 shows a closed circuit state, and FIG. 2 shows a state in the middle of an open circuit. The movable contact 1 is fixed to a piston/4 that moves in the axial direction inside a cylinder 3 provided on the movable conductor 2,
An operating rod 5 is attached to the piston 4 in the opposite direction to the movable contact 1. Cylinder 351 of movable contact 1
! A movable f11I current collector 6 attached to the fixed conductor 2 is placed in contact with the outer periphery of the I end. -1 ft, and a movable shield 7 attached to the movable conductor 2 is arranged so as to cover the outside of the movable current collector 6.

An arcing contact 9 slidably supported by the fixed conductor 8 is disposed at a position facing the tip of the movable contact 1, and a counter-movable contact 11iil of the arcing contact 9
The ends are supported by wipe springs 10. Further, around this arcing contactor 9, a fixed @ is attached to the fixed side conductor 8 so as to cover this arcing contactor 9.
A collector 11 is arranged. To the east of this fixed side current collector 11, a fixed 1 liter node 12 is arranged on the outer periphery of the fixed side conductor 8 so as to solder it. Note that when the disconnector is in the closed state as shown in FIG. presses the arcing contact 9 in the direction of the movable contact 11411. An intermediate shield 13 is arranged near the middle between the movable shield 7 and the fixed shield 12 so as to surround the movable contact 1. This intermediate shield 13 is fixed via a sheath 14rc supporting insulation efkJ15. Furthermore, this intermediate shield 13 is connected to the fixed@shield 12 by a resistor 16. The movable contact 1 has a suction hole 17 having an opening at its tip extending in the axial direction. There is. 9. A buffer 7 chamber 18 is formed by the cylinder 3, the piston 4, and the outer peripheral surface of the IIb contactor 1, and this buffer volume 18 communicates with the suction hole 17. Historically, the inside of the sheath 14 is filled with SF or gas.

When the movable wJ contact 1, the piston/4, and the operating rod 5 are driven in the direction of the arrow in the figure, the volume of the buffer N18 increases and the movable contact 1 and the arcing contact 9 are separated.

Then, SFa gas flows into the suction hole 17 provided inside the movable contact 1.

At this time, as shown in FIG. 2, a loop current arc 19 generated between the movable contact 1 and the arcing contact 9 is extinguished by the gas flow of SFg.

In such a conventional 8F gas disconnector, as shown in FIG.
The separation distance is short, and the path of the arc 19 is limited between the center of the movable contact 1 and the arcing contact 9.

However, when interrupting a large current such as 6,000 to 12,000 A, the separation distance of the movable contact 1 becomes longer until the arc 19 is extinguished, as shown in Figure @4, and the path of the arc 19 also becomes shorter than the movable contact. 1 end and the fixed side shield 12. In this way, if an arc occurs at the end of the movable contact 1, where SFg gas spraying is less effective, the breaking performance will decrease, and the shield will be damaged by the shield arc, reducing the dielectric strength between the electrodes. There were drawbacks.

In addition, as a method of supporting the intermediate shield 13 and the resistor 16, it is necessary to provide a support insulator 15, but SF
Providing the supporting insulator 15 from the sheath 14 in the vicinity of the disconnection section where decomposition products are generated is not preferred from the viewpoint of reliability.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a new SF6 gas switch which can cut off ultra-high voltage and large current with high reliability.

In the present invention, an insulating nozzle is provided between the fixed side shield and the intermediate shield, and the arc generated between the movable contact and the arcing contact when the contact is opened is contained within the nozzle. 5llly[In addition to improving performance,
This structure prevents the arc from moving to the fixed @7-field to prevent damage to the seventh-field, and also fixedly supports the intermediate shield and the interrupting resistor by the insulating nozzle.

Hereinafter, an embodiment of the SFs gas disconnector of the present invention will be described with reference to FIG. 5, using the same reference numerals for the same parts as those of the conventional example.

FIG. 5 shows the structure of the Srm gas disconnector of this embodiment in a closed state. The tip of the movable contact 1 fixed to a piston 4 movable within a cylinder 3 provided on the movable conductor 2 comes into contact with the arcing contact 9, and the fixed current collector 11 contacts the outer periphery of the movable contact 1. is in contact with.

A fixed side lead 12, which is attached to the fixed side conductor 8, is arranged so as to surround the outside of the fixed side current collector 11. An insulating nozzle 20 located on the outer periphery of the movable contact 1 with a predetermined gap is fixed to the front part of the fixed shield 12, and an intermediate shield 13 is attached to the tip of the insulating nozzle 20. . In addition, the resistor 16 connected to the intermediate shield 13 and the fixed side shield 12 is also
It is supported by the insulating nozzle 20. The insulating nozzle 20 has a cylindrical shape with a mortar-like taper formed on the inner surface of its opening.

When the movable contact 1, the piston 4, and the operating rod 5 move to the left in the figure during opening, the volume of the buffer chamber 18 increases, SF6 gas is sucked in from the suction hole 17 of the movable contact 1, and arcing contact occurs. A gas flow is created between the child 9 and the movable contact 1.

According to the disconnector of this embodiment, even if the separation distance of the movable contact 1 until the arc is extinguished when the arc is interrupted is long, the arcing contact 9 and the movable contact 1 are Since the space between the two ends is surrounded by the insulating nozzle 20, the path of the arc does not shift between the tip of the movable contact 1 and the fixed shield 12, so the effect of arc blowing by the gas flow is inhibited. Ensures high current of 3J without being damaged.
There is an effect that can be achieved by awtr. In addition, the fixed side shield 12
Since there is no arcing between the two electrodes, there is no damage to the fixed side shield 12, etc., and the dielectric strength between the electrodes is prevented from being lowered, which has the effect of increasing the reliability of the disconnector.

As described above, the SFs gas disconnector of the present invention has the effect of being able to interrupt ultra-high voltage and large current with high reliability.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams showing the structure of a conventional 8F gas disconnector; Figure 3 is an explanatory diagram showing the state of the arc that occurs when a conventional SF gas disconnector normally cuts the current quickly; The figure is an explanatory diagram showing the state of the arc that occurs when the conventional SFg gas disconnector interrupts the dog current, and FIG. 5 is an explanatory diagram showing the structure of an embodiment of the SFg gas disconnector of the present invention. DESCRIPTION OF SYMBOLS 1... m contactor, 2... movable side conductor, 3... cylinder, 4... piston, 7... movable side rolled,
8... Solid rectangular side conductor, 9... Arcing contact, 12
... Fixed side shield, 13 ... Intermediate shield, 16
...Resistor, 177 / Tube / 4 Y2 Figure 3 Figure 4 Broom 2

Claims (1)

[Claims] 1.' A fixed side electrode and a movable side electrode arranged to face each other,
a movable contact provided on the movable side electrode; a fixed side shield attached to the pole on the fixed side and covering the periphery of the movable contact;
It has an intermediate shield that covers the movable contact and is arranged approximately in the middle between the fixed side electrode and the movable side electrode, and a resistor that connects the intermediate shield and the fixed side shield, When the movable contact is separated from the contact part in the center of the fixed electrode, the tip of the movable contact has an opening, and the suction hole provided in the inner axial direction of the movable contact allows air to pass through the surrounding area. In the SF6 gas disconnector, which extinguishes the arc by inhaling gas, a gas flow is generated near the tip of the movable contact, and a cone-shaped taper is formed on the inner surface of the opening. A cylindrical insulating nozzle is attached to the fixed side/
- An SF, gas disconnector characterized in that it is attached to the fixed side shield and an intermediate shield is placed in the middle of the fixed side shield. 2. The 8F gas disconnector according to claim 1, wherein the intermediate shield and the resistor are supported and fixed by an insulating nozzle.