JP2765432B2 - Disconnector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disconnector provided with a surge suppression resistor.

[0002]

2. Description of the Related Art FIG.
2 is a conventional resistor disconnector disclosed in Japanese Patent Application Publication No. 2 (JP-A) No. 2 (1994). In the figure, reference numeral 1 denotes a ground tank, which is filled with an insulating gas.
Reference numeral 2 denotes a fixed electrode fixed to the ground tank 1 via an insulating spacer (not shown), and 3 denotes a fixed electrode 2 as shown in FIG.
, One end of which is electrically connected to the fixed electrode 2. 4 is a fixed shield electrically and mechanically attached to the other end of the resistor 3, 5 is a movable electrode that comes into contact with and separates from the fixed electrode 2, 6 is a movable shield surrounding the movable electrode 5, and 7 is a fixed shield. 4 is an arc generated between the movable electrode 4 and the movable electrode 5.

Next, the operation will be described. Both electrodes 2, 5
When the path is closed, when the movable electrode 5 approaches the fixed-side shield 4, a dielectric breakdown (pre-arc) occurs between the movable electrode 5 and the fixed-side shield 4. At this time, the electric charge of the bus or the like of the gas insulated switchgear moves, and a disconnector surge occurs. However, the movable electrode 5, the fixed-side shield 4, and the resistor 3
Constitute a series circuit via the arc 7 and the resistor 3 is inserted in the surge circuit, so that the surge can be suppressed.

For example, when a pre-arc occurs at one of the two electrodes 2, 5 at + V and the other at -V, the potential difference E applied to both ends of the resistor 3 increases as the resistance value increases. A practical resistance of 500Ω to 1,000Ω results in a voltage of approximately 2V. 1,000 KV (UHV)
For a class disconnector, it is about 1,800 KV. During pre-arcing, in the same potential to the fixed side shield 4 and the movable electrode 5, the potential difference also 2V between these and the fixed electrodes 2 is generated, it is necessary to predetermined insulation distance l _1.

[0005]

Since INVENTION Problems to be Solved conventional disconnector is constructed as described above, an insulating distance l ₂ between the movable side shield 6 and the stationary electrode 2 becomes longer. Accordingly, there is a problem that the stroke of the movable electrode 5 becomes longer and the operating force becomes larger. In addition, the resistor is provided concentrically around the fixed electrode, and it is necessary to secure the insulation distance D over the entire circumference of the fixed electrode. Therefore,
Since the outer diameter of the shield body needs to be large, there is a problem that the inner diameter of the grounding tank needs to be increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to obtain a disconnector capable of reducing operating force.

[0007]

According to the present invention, there is provided a disconnector comprising: a fixed electrode surrounded by a fixed shield in a cylindrical grounding tank; and a movable electrode surrounded by a movable shield. When the movable electrode and the fixed-side shield are connected by an arc, the fixed electrode is led out in a direction perpendicular to the axial direction of the ground tank via the conductive support member. The resistor and the resistor constitute a series circuit.After the two electrodes are closed, the fixed-side shield and the resistor are electrically short-circuited. A resistor is disposed on the opposite side of the movable electrode with respect to the fixed electrode, and the fixed-side shield, the resistor, and the fixed electrode are electrically connected in series.

Further, the resistor is disposed on the opposite side of the support member substantially in parallel with the axial direction of the ground tank. Also,
The direction in which the fixed electrode and the movable electrode come and go is decentered by a predetermined distance from the axis of the grounding tank toward the support member, and a resistor is arranged on the opposite side of the support member. Further, an intermediate shield supported by a resistor is provided between the fixed side shields. In addition, one end of the resistor is connected to the fixed electrode, the other end is connected to the fixed-side shield, and the other end is arranged so that the other end is farther from a straight line in the contact / separation direction of both electrodes than one end of the resistor. .

[0009]

In the disconnector according to the present invention, since the resistor is disposed on the opposite side of the movable electrode with respect to the fixed electrode, the insulation distance between the movable shield and the fixed electrode can be reduced. Further, since the resistor is arranged on the opposite side of the support member substantially in parallel with the axial direction of the ground tank, the number of opposed portions between the fixed electrode and the resistor is reduced.

Further, the direction of contact and separation between the fixed electrode and the movable electrode is decentered by a predetermined distance from the axis of the ground tank toward the support member, and the resistor is disposed on the opposite side of the support member. Since the insulation distance of the ground tank can be easily secured, the size of the grounding tank can be reduced. Also, one end of the resistor is connected to the fixed electrode on the side opposite to the side where the fixed electrode faces the movable electrode, the other end is connected to the fixed-side shield, and the other end is connected to and separated from both electrodes from one end of the resistor. Since it is arranged so as to be far from the straight line in the direction, the mounting portion between the resistor and the fixed electrode can be miniaturized.

[0011]

【Example】

Embodiment 1 FIG. Hereinafter, an embodiment of the present invention will be described. 1 and 2, reference numerals 1, 2, 5 to 7 are the same as those in the related art. 8, 9 are insulating spacers attached to the opening of the tank 1, 10 and 11 are conductors fixed to the insulating spacers 8 and 9, and 12 is a conductive support member electrically and mechanically attached to the conductor 10. Electrodes 2 are electrically and mechanically attached. Reference numeral 13 denotes a rod-shaped resistor disposed on the opposite side of the movable electrode 5 with the fixed electrode 2 interposed therebetween in the direction in which the two electrodes 2 and 5 come into contact with each other, and one end is electrically and mechanically attached to the support member 12.

Reference numeral 14 denotes a fixed-side shield surrounding the fixed electrode 2 and the resistor 13, which is mechanically supported at the other end of the resistor 13 and is electrically connected. 15 is a movable electrode 5
And a conductive support member electrically connected to the conductor 11 by a sliding contact 16 and electrically and mechanically attached to the conductor 11. 17
Drives the movable electrode 5 in a contact / separation direction with a lever connected to a drive source (not shown). Numerals 18 and 19 are lids closing each end of the tank 1.

Next, the operation will be described. FIG. 1 shows a state where an arc 7 is generated between the fixed shield 14 and the movable electrode 5. In the drawing, when the arc 7 occurs, the disconnector surge propagates through the fixed shield 14, the resistor 13, the support member 12, and the conductor 10, and is suppressed by the resistor 13. Then, at the time of closing, the movable electrode 5 further moves to the left in the drawing, whereby the two electrodes 2 and 5 come into contact with each other to complete the closing operation. At the time of opening, the movable electrode 5 moves rightward in the figure, and the opening operation is completed.

As described above, the action of suppressing the disconnector surge is the same as that of the prior art. However, since the resistor 13 is arranged on the side opposite to the movable electrode 5, the stroke of the movable electrode 5 is shortened, and the operating force can be reduced. . Further, since the resistor 13 is not arranged below the contact portion between the electrodes 2 and 5, there is no adhesion of metal foreign matter, and the reliability of the resistor is improved.

Embodiment 2 FIG. In the first embodiment, the resistor 13
3, the fixed side shield 14 is mechanically supported. However, as shown in FIG. 3, an insulating rod 19 is arranged between the resistors 13 and the fixed side shield 14 is
May be fixed.

Embodiment 3 FIG. 4 and 5, reference numeral 20 denotes a first fixed side shield attached to the support member 12 on the opposite side of the fixed electrode 2, and reference numeral 21 denotes one end of the first fixed side shield 20.
Resistor 22 electrically and mechanically attached to the resistor 22
The other end of the first is a second fixed side shield electrically and mechanically attached.

In FIG. 4 and FIG. 5, the fixed electrode 2 is installed eccentrically by a certain distance e from the axis of the ground tank 1, and the resistor 21 is concentrated and installed in a direction opposite to the eccentric direction. It has a configuration. With this configuration, a potential difference occurs between the resistor 21 and the fixed electrode 2 at the time of re-ignition at the time of opening and closing the charging current. Insulation distance D to withstand the potential difference
It is not necessary to secure the entire circumference of the fixed electrode 2 as in the conventional example, and only one direction in which the resistor 21 is provided is sufficient. Therefore, the shield members 20, 2
2 and the overall size of the ground tank 1 can be reduced by downsizing.

Embodiment 4 FIG. Although the fixed electrode 2 is eccentric from the axis of the ground tank 1 in the above embodiment, a similar effect can be expected even if the fixed electrode 2 is configured to coincide with the axis of the ground tank 1.

Embodiment 5 FIG. 6 and 7, an intermediate shield 23 having substantially the same diameter as the shields 20 and 22 is disposed between the fixed shields 20 and 22 and supported by the resistors 21. In the disconnector configured as described above, the disconnector surge generated at the time of opening and closing the charging current is suppressed by the resistor 21 as in the conventional device. In a disconnector of the 1000 KV (UHV) class, the length of the resistor is from several hundred mm to 1,000 mm. By the bodies 20, 22, and 23, the drop of the potential to the resistor 21 can be reduced. Therefore, the surface electric field of the resistor 21 can be reduced, and the insulation reliability of the resistor 21 can be improved. Further, since the surface electric field of the resistor 21 can be reduced, the diameter of the grounding tank 1 can be reduced, and the disconnector can be downsized.

Embodiment 6 FIG. FIG. 8 shows an intermediate shield 24 supported by a plurality of resistors 21. Even in the case of such a configuration, Embodiment 5. The same effect can be expected.

Embodiment 7 FIG. 9 and 10 show the shield 2
This is provided with a resistor 25 connected to the resistor 21 via 0. One end of the resistor 25 is fixed to the shield 20, and the other end is fixed to the support member and is electrically connected to the fixed electrode 2.

In the closing operation of the disconnector having the above-described configuration, the disconnector surge caused by the pre-arc generated between the movable electrode 5 and the fixed shield 22 causes the fixed shield 22, the resistor 21, the fixed shield 20, and the resistor 25. Are propagated to the fixed electrode 2 and are suppressed by the resistors 21 and 25. In the opening operation, the movable electrode 5 is first separated from the fixed electrode 2 which is the main contact. When the movable electrode 5 and the fixed-side shield 22 are apart from each other by a certain distance, the dielectric strength becomes smaller and a pre-arc occurs, but the disconnector surge is suppressed by the same principle as the closing operation.

Further, in the above configuration, the resistors 21 and 25 are
Because of the division, the dimension on the fixed electrode side may be short. Therefore, the center distance between the fixed electrode 2 and the movable electrode 5 can be reduced, so that the overall length can be reduced. Thereby, the stroke of the movable electrode is also shortened, so that the operation force can be reduced.

Embodiment 8 FIG. FIG. 11 shows that the resistor 21 is attached to the support member 12 on the side opposite to the side where the fixed electrode 2 faces the movable electrode 5.
Are connected to each other, the other end is connected to the fixed-side shield 22, and the other end of the resistor 21 is arranged so as to be farther from the direction in which the two electrodes 2 and 5 come into contact with and separated from each other. According to the above configuration, the mounting space for the resistor 21 can be reduced.

[0025]

As described above, according to the present invention, the resistor is arranged on the opposite side of the movable electrode with respect to the fixed electrode in the direction in which the fixed electrode and the movable electrode come and go. The stroke becomes shorter, and the operating force can be reduced.

Further, the fixed electrode is led out at right angles to the axial direction of the ground tank via the conductive support member, and the resistor is arranged on the opposite side of the support member substantially parallel to the axial direction of the ground tank. Therefore, the number of opposed portions between the fixed electrode and the resistor is reduced. In addition, since the direction of contact and separation between the fixed electrode and the movable electrode is decentered by a predetermined distance from the axis of the grounding tank toward the support member, and the resistor is disposed on the opposite side of the support member, the insulation distance between the resistor and the ground tank is reduced. This makes it easy to secure the ground tank, so that the grounding tank can be downsized.

Further, since an intermediate shield supported by a resistor is provided between both fixed side shields, the electric field on the surface of the resistor can be reduced, and the insulation reliability can be improved.

Further, the resistor is disposed on the opposite side of the movable electrode with the fixed electrode interposed therebetween in the direction in which the fixed electrode and the movable electrode come and go, and further, the opposite side of the support member is substantially parallel to the axial direction of the grounding tank. Also, the resistors are distributed and arranged, and the size of the grounding tank can be reduced.

Further, one end of the resistor is connected to the fixed electrode on the side opposite to the side where the fixed electrode faces the movable electrode, the other end is connected to the fixed side shield, and the other end is connected to both electrodes from one end of the resistor. The mounting portion between the resistor and the fixed electrode can be miniaturized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view of Example 1 taken along line II-II in FIG. 1;

FIG. 3 is a sectional view of Example 2 taken along line II-II of FIG. 1;

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 1;

FIG. 6 is a sectional view showing still another embodiment of the present invention.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

FIG. 8 is a sectional view showing another embodiment of the line VII-VII in FIG. 6;

FIG. 9 is a sectional view showing still another embodiment of the present invention.

FIG. 10 is a sectional view taken along line XX of FIG. 9;

FIG. 11 is a sectional view showing still another embodiment of the present invention.

FIG. 12 is a sectional view showing a conventional disconnector.

FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 12;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground tank 2 Fixed electrode 6 Movable shield 11 Support member 20 Fixed shield 21 Resistor 22 Fixed shield 25 Resistor

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-57-132620 (JP, A) JP-A-58-53332 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01H 33/00-33/26 H01H 9/30-9/50

Claims (8)

(57) [Claims] 1. A fixed electrode surrounded by a fixed shield in a cylindrical grounding tank and a movable electrode surrounded by a movable shield are contacted and separated in the axial direction of the grounding tank, and the fixed electrode is electrically conductive. Derived in a direction perpendicular to the axial direction of the ground tank via a support member, and at the time of closing the movable electrode and the fixed side shield are connected by an arc, the movable electrode, the fixed side shield, the resistor and Constitutes a series circuit and then the two electrodes are closed.After the circuit is closed, the fixed shield and the resistor are electrically short-circuited. And the movable electrode is connected by an arc, and the resistor is disposed on the opposite side of the movable electrode with the fixed electrode interposed therebetween in the direction of contact and separation of the two electrodes. 2. The disconnector according to claim 1, wherein each end of the resistor is supported by a fixed electrode and a fixed side shield, respectively. 3. A fixed electrode surrounded by a fixed shield in a cylindrical grounding tank and a movable electrode surrounded by a movable shield are separated from each other in the axial direction of the grounding tank, and the fixed electrode is electrically conductive. Derived in a direction perpendicular to the axial direction of the ground tank via a support member, and at the time of closing the movable electrode and the fixed side shield are connected by an arc, the movable electrode, the fixed side shield, the resistor and Constitutes a series circuit and then the two electrodes are closed.After the circuit is closed, the fixed shield and the resistor are electrically short-circuited. And the movable electrode are connected by an arc, and the movable electrode, the fixed-side shield, and the resistor form a series circuit so that the arc is extinguished. Tank A disconnector, which is arranged on the opposite side of the support member substantially in parallel with the axial direction. 4. The method according to claim 1, wherein the direction of contact and separation between the fixed electrode and the movable electrode is decentered by a predetermined distance from the axis of the ground tank toward the support member, and the resistor is disposed on the opposite side of the support member. The disconnector according to claim 3, wherein 5. The disconnector according to claim 3, wherein an intermediate shield supported by a resistor is provided between the fixed-side shields. 6. The device according to claim 3, wherein the resistor is divided into a plurality of resistors, and a plurality of intermediate shields are provided between the fixed shields and supported by the resistors. Disconnector. 7. A fixed electrode surrounded by a fixed shield in a cylindrical grounding tank and a movable electrode surrounded by a movable shield are separated from each other in the axial direction of the grounding tank, and the fixed electrode is electrically conductive. Derived in a direction perpendicular to the axial direction of the ground tank via a support member, and at the time of closing the movable electrode and the fixed side shield are connected by an arc, the movable electrode, the fixed side shield, the resistor and Constitutes a series circuit and then the two electrodes are closed.After the circuit is closed, the fixed shield and the resistor are electrically short-circuited. And the movable electrode is connected by an arc, the movable electrode, the fixed shield and the resistor constitute a series circuit, so that the arc is extinguished, the resistor, the resistor, the Ground tank A first resistor disposed substantially in parallel with the axial direction on the opposite side of the support member, and connecting one terminal to the first resistor via the fixed-side shield to connect and disconnect the two electrodes; A disconnector comprising a second resistor disposed on the opposite side of the movable electrode with respect to the fixed electrode in the direction and having the other terminal connected to the fixed electrode. 8. One end of a resistor is connected to the fixed electrode on the side opposite to the side where the fixed electrode faces the movable electrode, the other end is connected to a fixed-side shield, and the other end is connected to one end of the resistor. The disconnector according to any one of claims 3 to 7, wherein the disconnector is arranged so as to be farther from a straight line in the direction of contact and separation of the two electrodes.