JPS581933A - Gas insulating disconnecting switch - 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 relates to a gas insulated new circuit device.

Conventional new line equipment was responsible for disconnecting and connecting the grid during no-load conditions, and only needed to have the ability to switch on and off the charging current of the power transmission line. However, recently, the switchgear
With the introduction of F-gas insulation, the new circuit 11 is also required to have a load current switching ability due to the need for simplification and economical operation of the equipment.

An example of this is number 11! In a two-system system as shown in IIK, one system is disconnected when the power supply side and the load side of the power transmission bus 6 of B are shared and a loop is formed.

In No. 111, when disconnection 1) D+ or D+ or 8 is opened to disconnect one system, in the case shown, all current flows to the closed disconnection 11DIO system. Therefore, the voltage drop of the closed system is applied to the disconnector DsK, which opens and interrupts the current flow.

When the loop is long, the recovery voltage at the time of interruption becomes large, so the specifications for the interruption responsibility of new circuit devices become stricter. (methods that do not spray gas) will lack the shutoff ability.

There are also disconnectors that use rounding and buffering methods to increase the interrupting ability, but the operating force is quite large, so it is not economical for small capacities. As a method that does not require an increase in operating force, there is a method in which the arc is rotationally driven by a magnetic field using an arc drive coil and the arc is extinguished.

However, with this method, there is a risk that the charging current will be interrupted. If the coil is short-circuited, the loop current will be shunted, so a sufficient magnetic field to rotate the arc must be generated.

The present invention was developed in view of the above circumstances, and has a simple structure, excellent loop current breaking performance, protects the coil from overvoltage when the charging current is interrupted, maintains the breaking ability for a long time, and has a hanging structure. An object of the present invention is to provide a gas insulated disconnect switch having the following characteristics.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

Fig. 2 is a diagram explaining the overall structure of a gas-insulated new circuit device according to an embodiment of the present invention, and Fig. 3(a) shows the detailed structure of its main parts.
, (b) K is shown.

In FIG. 2, a movable electrode is fixed inside the cylindrical case 2 filled with an insulating gas 1 by an insulating spacer 3a supporting the fixed electrode part 3 and a conductor 4a1ir, and is arranged opposite to the fixed electrode part 3. The portion 5 is fixed to the case 2 by an insulating spacer 3bK that similarly supports the conductor 4b.

However, there are other methods of fixing both electrode portions 3.5, and the present invention is not limited to one method. A movable contact portion 6, which constitutes a part of the movable electrode portion 5, is connected to an operation mechanism portion (not shown) via an insulator 7 and a link 8.

Note that the energization paths during closing are in the order of 4a, 3, 6, and 5°4b.

FIG. 3 is an underground vertical cross-sectional view showing the detailed structure of the fixed electrode part 3 and the movable contact part 6 shown in FIG. 2, and shows the state during closing.

Describing the detailed structure of the fixed electrode section 3, a contact base 32 is fixed to the fixed main current-carrying conductor 31. A fixed current-carrying contact 33 is attached to the contact base 32,
It comes into contact with a movable current-carrying contact 61 disposed opposite to the fixed current-carrying contact 33 so as to be able to come into contact with and separate from it.

In order to obtain the contact pressure at this time, a spring 34 and a spring cover 35 are attached to the upper part of the fixed current-carrying contact 33. Further, a fixed arc finger contact 36 is arranged concentrically inside the fixed current-carrying contact 33. The base 3611 of the fixed arc finger contact 36 is fixed to the fixed main conductor 31 by melt 38 . Of the movable energizing contacts 61, IIK is provided with a movable arc finger contact 62 concentrically, and comes into contact with the fixed arc finger contact 36 so as to be able to move toward and away from it.

The tip of the movable arc finger contact 61 is made of an arc-resistant material 62 for contacting the fixed arc finger contact 36, and an arc drive coil 62b formed in a cylindrical shape is provided at the intermediate outer circumference thereof. The arc drive coil 62b has one end connected to an arc-resistant member 62aK, and the other end connected to the coil end link 6.
2c electrically and structurally joined.

A cylindrical auxiliary member 62d made of an insulating material is attached to the inner surface of the arc drive coil 62b between the arc-proofing member 62a and the coil end ring 62c.

Teeth-like protrusions 62e are provided on the arc-resistant member 62 and the coil end ring 62C that contact the inner surface of the auxiliary member 62d, and are configured to provide contact pressure with the fixed arc finger-like contact 36. Furthermore, arc resistance HIt 62m
A gap is provided between the opposing surfaces of the coil end ring 62C and the overvoltage protection gap 63 that is electrically parallel to the arc drive coil 62b.

Incidentally, the 04 configuration between each contact is configured such that the arc contact 36.62 is opened after the current-carrying contact 33.61 is opened.

Further, the fixed electrode section is provided with a shield 37 that covers the outer periphery of the current-carrying contact 330 side. Further, FIG. 3(a) shows the fixed arc finger contact 3 as seen from the direction of the arrow shown in the figure.
6 is an enlarged view of FIG. As shown in FIG. 3(b), the fixed arc finger contact 36 is provided with a plurality of grooves 36b in the axial direction.The fixed arc finger contact 36 is formed into a finger shape so that contact pressure can be obtained by its springiness. .

FIG. 4 is a diagram showing a state in which the gas-insulated new circuit device according to the present invention is in an open state.

The arc 30 generated by the arc-resistant member 62a I'&I'fC of the fixed arc contact 36 and the movable arc contact 62 is rotationally driven by the magnetic field generated by the arc drive coil 62b. This promotes the paper cooling effect. That is, the illustrated magnetic flux Φ has a component orthogonal to the arc 30, and its value can also be set large.

The arc 30 is cooled by the above action and extinguished at the current zero point. When the charging current is cut off and restarted in this case, a high surge voltage is applied to the arc drive coil 62b. However, due to the overvoltage protection gap 37 provided between the opposing surfaces of the arc-resistant member 62a and the coil end ring 62C, the insulation of the arc drive coil 62b is protected by the discharge in the gap G. Since the arc finger contacts 36 and 62 are provided inside each of the energizing contacts 33 and 61, the arc 30 can be generated at a position away from the case 2, which also reduces the occurrence of short circuit accidents. can do. On the other hand, the arc drive coil 36
Since a large electromagnetic force acts on b due to the current, if the strength of the coil is not sufficient, the arc drive coil 36b will suffer mechanical damage.

However, in the present invention, the arc drive coil 36
Since an auxiliary member made of an insulating material is attached to the inside of b, it can sufficiently withstand the large electromagnetic force generated when the current is cut off.

As explained above, the present invention provides a gas insulated disconnector which has a simple structure and excellent loop breaking performance, protects the arc drive coil from overvoltage when the charging current is cut off, maintains the breaking ability for a long time, and has a hanging structure. equipment can be provided.

[Brief explanation of the drawing]

Figure 1 is a diagram explaining a disconnector placed in a system and assigned the responsibility of switching loop current, Figure #I2 is a schematic configuration diagram of a gas-insulated disconnector according to an embodiment of the present invention, and Figures 3 and 4 are Second
It is a detailed view of the main part of the gas insulated disconnector shown in the figure, and is a diagram showing a state during opening and a state during opening. 1... Insulating gas 2... Cylindrical case 33... Fixed current-carrying contact 36... Fixed arc finger contact 61...
・Movable current-carrying contact 62...Movable arc finger contact 621...
...Arc-resistant member 62b...Arc drive coil 62C...Coil end ring 62d...
... Auxiliary member 63 ... Overvoltage protection gap (
7317) Agent: Patent Attorney Kensuke M Chichika (1 person) Figure 1 Figure 2 Figure 3 (a) β Figure 4

Claims (1)

[Claims] 1. A fixed current-carrying contact in a cylindrical case filled with insulating gas, and a fixed arc finger-like contact disposed inside the fixed current-carrying contact and electrically connected to the fixed current-carrying contact. and a cylindrical fixing device disposed so as to be able to freely approach and separate from the current-carrying contact.
In a gas-insulated disconnector comprising an inner side K111 of the current-carrying contact, a movable arc-shaped contact and a fixed-side arc finger-shaped contact disposed opposite to each other so as to be able to approach and separate, the movable-side arc finger-shaped contact The terminal is arranged concentrically with the arc-resistant member forming the tip and the movable current-carrying contact, and has one side electrically connected to the arc-resistant Toshin and the other side electrically connected to the movable current-carrying contact. An arc drive coil is electrically connected to a coil end ring that is electrically connected to the arc drive coil, and overvoltage protection is provided between the opposing surfaces of the coil end ring and the arc-resistant member between the arc drive coil and the electrical Km row. - A new gas insulated circuit device characterized by having nine empty formations forming a gap. An arc drive coil is disposed at the outer part of the fixed arc finger contact between the arc-resistant member and the coil end ring, and an auxiliary member made of insulating material is attached to the inside of this arc drive coil. A gas insulated disconnector according to claim 1.