JP2586276B2 - 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 having a resistor for suppressing switching surge.

[0002]

2. Description of the Related Art FIG. 10 is a cross-sectional view showing a conventional disconnector provided with a resistor disclosed in Japanese Patent Application Laid-Open No. 58-97228, for example.
In the figure, 1 is a grounding tank, 2 is a cylindrical fixed electrode as one of a pair of electrodes, 3 is a fixed contact that is electrically connected to the fixed electrode 2, and 4 is a terminal that reduces the electric field of the fixed contact 3. 1 shield, connected length resistor rod-like L ₁ between 5 and the fixed electrode 2 and the first shield 4, the movable electrode as the other of the pair of electrodes 6, 8 is a driving mechanism (FIG. Not shown)
The movable contact is driven in the axial direction of the fixed electrode 2 and is slidably supported by the movable electrode 6. The movable contact moves in the left-right direction in the drawing and comes into contact with or separates from the fixed contact 3, and is at the left position in the drawing. Are slidably in contact with the first shield 4. Reference numeral 9 denotes a second shield for relaxing the electric field of the movable contact 8. Here, as an insulating gas,
Filled with SF ₆ gas.

It is generally well known that a method of opening / closing via a resistor 5 at the time of opening / closing is effective as a method for suppressing the opening / closing surge of the disconnector having the above configuration. In FIG. 10, when the contact is opened, the movable contact 8 moves rightward from the state shown by the broken line and the fixed contact 3 and the movable contact 8 are first separated from each other.
The current is commutated to the resistance circuit of the first shield 4 → the resistor 5 → the fixed electrode 2. After the opening / closing surge is effectively suppressed by the resistor 5, the first shield 4 and the movable contact 8 are disconnected to be disconnected.

In the above description, since a high-frequency surge is applied to the resistor 5 in the resistor circuit, the required length L
₁ needs to be determined in consideration of the withstand voltage duty of the resistor 5. The withstand voltage duty of the resistor 5 is defined as a voltage applied to both ends of the resistor 5, V _R , a potential difference between the poles at the time of re-arcing (proportional to the rated voltage).
Where V _C , the resistance value is R, and the surge impedance of the gas insulated switchgear is Z, V _R = R · V _C / (R + Z)
As shown by, the severity becomes severe in proportion to the rated voltage and resistance value of the device.

On the other hand, the insulation distance in the gas is a 1/5 to 1/10 of the length L ₁ which is determined from the withstand voltage responsibilities described above, in the case of ultra-high pressure or ultra high pressure equipment, the resistor 5 the length L ₁ is the length which is determined from the withstand voltage duty, that is 1 m to 2 m.

In order to improve such a point, Japanese Patent Laid-Open No.
No. -97228, as a resistor 5, a plurality of resistor elements arranged in a parallel structure as a single-stage unit, this is formed in a plurality of stages, the resistor elements in each unit are electrically connected in series, In addition, it is shown that each stage is electrically connected in series. However, the total number of resistive elements is large and the number of components is very large.

[0007]

THE INVENTION Problems to be Solved by conventional disconnector is necessary to very long length L ₁ of the resistor 5 when applied which is configured as described above, a higher voltage equipment Therefore, there has been a problem that the whole apparatus is enlarged. Also,
A device in which a large number of resistors are connected in series has a problem that the number of components is very large, assembling is troublesome, and the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a disconnector provided with a resistor having a low-cost structure without increasing the size of equipment even for high-voltage use. The purpose is to gain.

[0009]

According to the present invention, there is provided a disconnector in which a resistor for suppressing switching surge provided on an electrode is wound coaxially with the electrode, or a plurality of resistance elements of a closed ring. Are arranged coaxially and the resistance elements are electrically connected in series.

[0010]

In the disconnector according to the present invention, by forming the resistor in a wound shape or a plurality of closed rings coaxially with the electrode, the axial length of the resistor can be shortened and the resistor can be formed with a small number of components. .

[0011]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 3, reference numerals 1 to 4 and 6 to 9 are the same as or equivalent to the conventional example. Reference numeral 21 denotes a spirally wound resistor coaxially with the fixed electrode 2, which is disposed between the first shield 4 and the fixed electrode 2, and has one end fixed to the first shield 4 and the other end fixed. Connected to electrode 2. FIG. 2 is a perspective view of the resistor 21.

In the figure, the diameter D of the resistor 21 is about 400 mm.
Then, when the total length is 2000 mm, the number of windings may be about two turns. Given the one turn of the potential drop, the overall length L ₂ in the axial direction of the gas insulation properties resistor 21 even considering the turn pitch which is determined by is significantly shortened becomes about 200 mm to 300 mm.

In the above, specific numerical values have been described by taking an example of an ultra-high voltage type. However, the configuration can be greatly reduced by the same principle at any rated voltage.

Embodiment 2 FIG. FIG. 3 shows another embodiment. FIG.
In the figure, reference numeral 18 denotes a movable contact which comes into contact with and separates from the fixed contact 3, and the front end of the stator 2 is a hollow hole. When the movable contact 18 is in contact with the fixed contact 3, the movable contact contact portion 18 a is in contact with the movable electrode contact portion 16 a of the movable electrode 16. Reference numeral 19 denotes a second shield for relaxing the electric field of the movable contact 18, and a shield contact portion 19 a slidably contacts the movable contact 18. Reference numeral 22 denotes a spirally wound resistor coaxially with the movable electrode 16 as shown in FIG.
It is arranged between the second shield 19 and the movable electrode 16, and has one end electrically connected to the second shield 19 and the other end electrically connected to the movable electrode 16. Reference numeral 31 denotes an arc contact attached to the fixed electrode 2 inside the fixed contact 3. In the above configuration, when the movable contact 18 moves to the right in the drawing, the movable contact 18 is separated from the fixed contact 3 and the movable contact contact portion 18a and the movable electrode contact portion 16a are separated, so that the movable electrode 16 → the resistor 22 → Second shield 19 → Movable contact 18
→ Arc contact 31 → Commutated to the resistance circuit of fixed electrode 2, and resistor 22 is inserted in series.

Embodiment 1 And Example 2 above. Has been described in which the first shield 4 and the movable contacts 8 and 18 are in contact with each other, but the first shield 4 and the movable contacts 8 and 18 have a predetermined gap and are connected by an arc. It may be configured as follows.

Embodiment 3 FIG. In the above embodiment, the resistor 2
As for 1,22, a spiral wound shape is shown,
A plurality of arc-shaped rings 23 opened as shown in FIG.
A structure in which the whole shape is wound in series by connecting in series at 24, or a plurality of rings having a polygonal shape with openings as shown in FIG.
Are connected in series by the connector 24, the same effect can be obtained.

Embodiment 4 FIG. FIG. 6 shows a structure in which the resistors 21 and 22 are embedded in the insulator 25. A groove may be formed in the insulator 25, and the resistors 21 and 22 may be embedded in the groove to be integrally formed.
FIG. 7 shows an example in which resistors 21 and 22 are applied or baked on the surface of an insulator 26.

Embodiment 5 FIG. For resistors 21 and 22 of the above embodiment, although the diameter D showed a substantially uniform examples over the entire length L _2, the same effects of a so-called tapered shape.

Embodiment 6 FIG. FIG. 8 shows another embodiment of the resistors 21 and 22 of the above embodiment. In FIG. 8, reference numeral 27a denotes a closed ring resistance element, a plurality of which are arranged side by side in a coaxial direction with the electrodes. 27b indicates a conductor. In this example, the conductor 27b is attached at two places per one resistive element 27a, and the upper and lower conductors 27b of the resistive element 27a in FIG. 8 have a structure having an angle difference of about 90 ° from each other. The current flowing through the resistor 27 flows as shown by the arrow in the figure, and the resistance in the circumferential direction of the ring is used.
It becomes a resistor with a short axial length.

In the above embodiment, a conductor is connected to the resistance element 27a.
Two conductors 27b are attached, and the conductor 27b attachment position is shifted from the adjacent resistance element by about 90 °.
The number of the conductors 27b attached to a may be any number. Further, as shown in FIG. 9, a closed ring of a plurality of flat plates is used as a resistor.
A structure may be employed in which the inside and the outside of 28a are alternately connected by a conductor 28b and the resistance in the radial direction of the closing ring 28a is used.

[0021]

As described above, according to the present invention, since the resistor for suppressing switching surge is formed in a wound or ring shape coaxially with the electrode, the axial length of the resistor can be shortened. In addition, it is possible to obtain a small disconnector and to obtain an inexpensive one because the number of parts constituting the resistor is small.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of the resistor of the invention shown in FIG. 1;

FIG. 3 is a sectional view of a disconnector showing another embodiment of the present invention.

FIG. 4 is a view showing a resistor according to another embodiment of FIGS. 1 and 2;

FIG. 5 is a view showing a resistor according to another embodiment of FIGS. 1 and 2;

FIG. 6 is a view showing a resistor according to another embodiment of FIGS. 1 and 2;

FIG. 7 is a view showing a resistor according to another embodiment of FIGS. 1 and 2;

FIG. 8 is a perspective view showing a resistor according to another embodiment of FIGS. 1 and 2;

FIG. 9 is a perspective view showing a resistor according to another embodiment of FIGS. 1 and 2;

FIG. 10 is a sectional view showing a conventional disconnector.

FIG. 11 is a front view showing the resistor of FIG. 10;

[Explanation of symbols]

 2 fixed electrode 4 first shield 8 movable electrode 9 second shield 21 resistor 22 resistor 23 resistor 24 connector 25 insulator 26 insulator 27a resistor 27b conductor 28a resistor 28b conductor

Continuation of the front page (56) References JP-A-5-20972 (JP, A) JP-A-5-20973 (JP, A) JP-A-60-189123 (JP, A) JP-A-50-16078 (JP, A) JP-A-47-10326 (JP, A) JP-A-58-97228 (JP, A)

Claims (3)

(57) [Claims] An electrode is provided with a pair of cylindrical electrodes having a shield for alleviating an electric field, and a resistor is provided between one of the electrodes and the shield attached to the electrode, so that a resistor is provided when a current is opened and closed. A disconnector which can be opened and closed via the resistor, wherein the resistor has a wound structure coaxially with the electrode. 2. A semiconductor device comprising: a pair of cylindrical electrodes having a shield for relaxing an electric field; a resistor provided between one of the electrodes and the shield attached to the electrode, and a resistor provided between the electrode and a shield attached to the electrode. In the disconnector which can be opened and closed via this resistor, a plurality of resistor elements of a closed ring are arranged in the axial direction coaxially with the electrode as the resistor, and the resistor elements are different from each other in the circumferential direction. A disconnector connected to a resistor element on both sides at a position and electrically connected in series with each other so as to use a resistance in a circumferential direction of the resistor element. 3. A pair of cylindrical electrodes having a shield for alleviating an electric field, wherein one of the electrodes is provided with a resistor between the electrode and a shield attached to the electrode, and a resistor is provided at the time of current switching. In the disconnector which can be opened and closed via this resistor, a plurality of resistive elements of a flat plate closed ring are arranged in the axial direction coaxially with the electrode as the resistive element, and the resistive elements are adjacent to each other. Are alternately connected inside and outside, and are electrically connected in series with each other so as to use the radial resistance of the resistance element.