JP2002260470A - Gas insulated circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas insulated circuit breaker which uses smaller number of parts and is more compact compared with a gas insulated circuit breaker having a similar cutoff voltage and a similar cutoff current. SOLUTION: This gas insulated circuit breaker has a fixed conductor and a movable conductor in a metal case filled with an insulative gas and connected to the ground. The fixed conductor has a cylindrical fixed contactor flexible in the radial direction at its leading edge, and the movable conductor has a mover at its leading edge so that the mover can move inside the movable conductor having a contact with the cylindrical fixed contactor and the cylindrical movable contactor. By putting the leading edge of the inner peripheral surface of the fixed contactor in touch with the leading edge of the outer peripheral surface of the mover, an electric path is formed between the conductors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a novel gas insulated disconnector.

[0002]

Conventionally, by using the superior SF ₆ gas insulation and arc-extinguishing, a switch housed placed in a metal casing, and compact installation volume of the environmental resistance and kV · A gas per Insulated switchgear is already in widespread use. A disconnecting switch is one of the devices constituting the gas insulated switchgear, and the disconnecting switch must satisfy three requirements of a current-carrying performance, a breaking performance, and an insulating performance. For example, the disconnector described in JP-A-1-67834 has a conventional structure. The contact force between the mover and the contact, which affects the current-carrying performance, uses a coil spring mounted outside the contact, and a liquid metal is placed between the mover and the stator to further improve the reliability of the contact force. Used. As for the breaking performance, it is general that the specifications are satisfied by optimizing the gap length and the operating speed of the mover. Further, in order to ensure insulation performance, a substantially cylindrical shield is attached to the outside of the contact. In the disconnector having such a structure, the number of parts is large, and the diameter of the high voltage portion is increased due to the substantially cylindrical shield covering the contact, which makes it difficult to downsize the disconnector. When a contact using the coil spring is used, as shown in the figure, there are four contact surfaces using the contact force of the coil spring for one pole. Such a contact surface has a problem that the temperature tends to increase when energized compared to other portions. For this reason, in order to suppress a rise in temperature at the time of energization, measures have been taken such as increasing the contact area of the contactor and increasing the contact force. However, if the diameter of the mover is increased in order to increase the contact surface, or if the contact force is increased, there is a problem that the contact surface is damaged when the disconnecting switch is opened and closed.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gas insulated disconnector in which the number of parts is reduced and the size is reduced while ensuring reliability, compared with the same voltage and the same rated current. Is to do.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a contact element which obtains a contact force by utilizing the spring property of a contact element element also serves as a shield or a movable element, thereby reducing the number of parts and reducing the size of the gas. Insulated disconnector.

According to the present invention, a fixed-side conductor and a movable-side conductor are provided in a metal case filled with an insulating gas and grounded, and the fixed-side conductor is provided at its distal end with a cylinder having radial flexibility. A fixed-side contact is provided, and the movable-side conductor includes a cylindrical movable-side contact at a distal end thereof and a mover movably so as to contact the inside of the movable-side conductor with the cylindrical fixed-side contact. The gas-insulated disconnector is characterized in that current is conducted between the conductors by contact between the tip of the inner peripheral surface of the fixed contact and the tip of the outer peripheral surface of the mover.

Further, the present invention has a fixed-side conductor and a movable-side conductor in a metal case filled with an insulating gas and grounded, and the fixed-side conductor has a cylindrical fixed-side contact at its tip. A conductive rod connected to the fixed-side conductor at an inner peripheral portion of the contact, wherein the movable-side conductor has a cylindrical movable contact provided at a tip end thereof and the movable-side conductor has a cylindrical shape. A cylindrical movable element having flexibility in the radial direction so as to be movable so as to be in contact with the fixed-side contactor, wherein the conductor is provided by contact between the outer peripheral surface tip of the conductive rod and the inner peripheral surface tip of the cylindrical movable element. A gas-insulated disconnector characterized in that current is supplied to the gas-insulated disconnector.

Further, the present invention has a fixed-side conductor and a movable-side conductor in a grounded metal case filled with an insulating gas, and the fixed-side conductor has a cylindrical fixed-side shield and a cylindrical fixed-side shield at its tip. A conductive rod connected to the fixed-side conductor at an inner peripheral portion of the shield, wherein the movable-side conductor has a cylindrical movable-side contact at an end thereof and the cylindrical fixed-side contact within the movable-side conductor; A cylindrical movable element having flexibility in the radial direction movably so as to be in contact with the conductive rod, and energizing between the conductors by contact between the tip of the outer peripheral surface of the conductive rod and the tip of the inner peripheral surface of the cylindrical movable element. A gas insulated disconnector characterized in that:

Further, the present invention has a fixed-side conductor and a movable-side conductor in a grounded metal case filled with an insulating gas, and the fixed-side conductor is provided with a cylindrical fixed-side shield at a tip end thereof. The movable-side conductor has a cylindrical movable-side contact at a distal end thereof and a cylindrical movable-member movable to contact the inside of the movable-side conductor with the cylindrical fixed-side contact. The gas-insulated disconnector is characterized in that a current is applied between the conductors by contact between the tip of the inner peripheral surface and the tip of the outer peripheral surface of the mover.

Further, the present invention has a fixed-side conductor and a movable-side conductor in a grounded metal case filled with an insulating gas, and the fixed-side conductor is provided with a conductive rod at the tip thereof. The movable-side conductor has a cylindrical movable-side contact at a tip end thereof and a cylindrical movable-member movable to contact the inside of the movable-side conductor with the cylindrical fixed-side contact, and an outer peripheral surface of the conductive rod. The gas insulated disconnector is characterized in that current is conducted between the conductors by contact between the tip and the tip of the inner peripheral surface of the cylindrical mover.

The fixed side contact and the movable side contact have notches parallel to the axial direction, and have a spring property.
Further, at least one of the contact portions of the fixed side contact, the movable side contact, the mover and the conductive rod, which are in contact with each other, includes a conductive metal and an arc-resistant metal having a higher melting point than the metal. Being configured,
Further, it is preferable that the metal case has a cylindrical shape, and a ratio of (radius of the metal case) / (distal end portion distance between the fixed contact and the movable contact) is 2-3.

[0011] The composite member is preferably formed of a fixed contact, a movable contact, a movable element, and a conductive rod made of a conductive metal and joined to contact portions that come into contact with each other. The conductive metals are Cu, Ag, Au, their alloys 20 to 50% by weight, and the arc-resistant metals Cr, W, Mo, T
a, a sintered alloy having 50 to 80% by weight of these alloys, an alloy obtained by infiltration of a conductive metal into an arc-resistant metal, an alloy obtained by melting, and the like are used.

As described above, the present invention is characterized in that a substantially cylindrical shield covering the contact outside the contact can be omitted. As this specific structure, the contacts are arranged only on the fixed side, the tip of the mover is cylindrical, and the tip of the mover has a cut parallel to the axial direction of the mover. A conductive rod with a diameter smaller than the outer diameter of the mover is provided, and the tip of the mover comes into contact with the conductive rod when the pole is closed, and a shield having a larger outer diameter than the outer shape of the mover is provided on the fixed side. . Specifically, the movable element has a substantially cylindrical conductive member having a notch at the distal end portion parallel to the axial direction of the movable element and having a diameter larger than the outer diameter of the movable element on the fixed side. When the pole is poled, the tip of the mover comes into contact with the substantially cylindrical member, the fixed-side contact is omitted, and the outer diameter of the mover is smaller than the outer diameter of the mover on the fixed electrode side where the mover is inserted. I had a rod.

By using a contact element utilizing spring properties as the above-mentioned contact element piece, the number of parts of the contact element can be greatly reduced, and at the same time, the contact element can also serve as a shield. In addition, the diameter of the high voltage portion can be further reduced. Further, since one side of the contact can be fixed with a bolt or the like, a rise in temperature at the time of energization can be suppressed, so that the diameter of the mover which becomes a high voltage can be reduced. For this reason, the size of the gas insulated disconnector can be reduced.

[0014]

(Embodiment 1) FIG. 1 is a sectional view of a gas insulated disconnector in which a contact of the present invention also serves as a shield. The upper part of the center axis shows an external view of the gap, and the lower part shows a sectional view. Gas insulated disconnector is installed machining gap in the tank 1 made of a metal casing which is grounded, it is insulated by filling the tank 1 insulating gas e.g. SF ₆ gas.
When the disconnector is closed, the mover 6 is inserted into the fixed contact 4, and the current flows through the movable conductor 3 → the movable contact 4 a → the movable 6 → the fixed contact 4 b → the fixed conductor 2. Flow in order. The mover 6 is supported by a guide 7 so as to move on the axis between the poles. The second item, breaking performance, can be improved by increasing the gap length and increasing the operating speed of the mover. However, as shown in FIG. 6, a phenomenon II is known in which the arc I between the poles generated at the time of cutoff reaches the grounded tank and causes dielectric breakdown. . The portion of the tank 1 having the contact is cylindrical, and the same applies to the contact. Contacts 4a, 4b
Has a cylindrical shape, and has a shape in which all of the opposing surfaces are narrowed, so that a high contact force can be obtained with respect to the mover due to its spring property.

In this embodiment, in a tank 1 as a grounded metal case filled with an insulating gas, a fixed-side conductor 2 is provided with a flexible cylindrical fixed-side contact 4b at the tip thereof. The cylindrical movable-side conductor 3 has a cylindrical movable-side contact 4a at its tip and a movable element 6 movably so that the inside of the movable-side conductor 3 contacts the fixed-side contact 4b. Conduction and interruption between conductors are performed by contact between the inner peripheral end of the armature 4b and the outer peripheral end of the mover 6.

FIG. 7 is a diagram showing the relationship between the ratio between the gap length and the radius of the ground tank and the ground insulation performance at the time of shutoff. If the (tank radius) / (gap length) ratio is less than 2 irrespective of the gap length, insulation breakdown to ground will occur at the time of interruption. For this reason, as a condition that satisfies both the miniaturization of the disconnector and the ground insulation performance at the time of interruption, it is preferable that the ratio of (tank radius) / (interpole length) be 2.2 to 3. The gap length is the distance between the tips between the contacts 4a and 4b.

The insulation performance, which is the third item, can be improved by processing the curvature of the tips of the contacts 4a and 4b and the end of the contact piece of the contact shown in FIG.
By configuring the disconnector in this manner, the number of components can be significantly reduced, and the outer diameter of the high-voltage section can be reduced, so that the disconnector can be downsized. By the way, in a disconnector having a frequent opening / closing frequency, there is a problem that the contact 4a, 4b or the electrode at the tip of the mover 6 is worn out by the arc. By attaching an arc-resistant metal having a high melting point metal to the electrode, it is possible to suppress the consumption of the electrode by the arc, so that the invention can be applied to a disconnector having a frequent opening and closing frequency.

(Embodiment 2) FIG. 2 is a cross-sectional view of a gas-insulated disconnector in which the contact of the present invention also serves as a shield and has an arc contact. In the case of a disconnector requiring a relatively large current interrupting duty such as a loop opening / closing specification, the configuration as shown in FIG. 1 has a problem that the contact is melted by heat generated by the arc. For this reason, it is necessary to take measures such as applying a material that is difficult to melt to the contact, increasing the contact area of the contact, and increasing the speed of the mover, making it difficult to miniaturize the disconnector. . In the case of such a disconnector requiring a relatively large current interrupting duty, as shown in FIG. 2, the arc contact 5 which receives an arc generated between the mover 6 and the contact 4b when the contact is opened is fixed-side contact. By placing it in the child 4b,
Melting of the contact piece by the arc can be prevented,
The specification can be achieved without changing the operating speed of the contact or the mover. For this reason, the number of components can be significantly reduced as compared with the conventional disconnector, and the disconnector can be downsized.

That is, in this embodiment, a fixed-side conductor 2 and a cylindrical movable-side conductor 3 are provided in a grounded metal case 1 filled with an insulating gas, and the fixed-side conductor 2 has a cylindrical end at its tip. The fixed movable contact 4b and an arc contact 5 made of a conductive rod connected to the fixed conductor 2 are provided on the inner periphery of the fixed movable contact 4b. A contact 4a and a cylindrical mover 6 movably provided in the movable-side conductor are provided, and current is supplied between conductors by contact between the outer peripheral end of the arc contact 5 and the inner peripheral end of the cylindrical mover 6. And shut off.

According to this embodiment, it is possible to obtain a gas insulated disconnector capable of reducing the number of components of the disconnector and realizing miniaturization while ensuring reliability. In particular, the number of parts can be reduced and the device can be made compact as compared with a gas insulated disconnector that interrupts the same voltage and the same current.

(Embodiment 3) FIG. 3 shows a gas-insulated disconnector in which the mover of the present invention also serves as a contact. On the fixed side, an arc contact 5 that doubles as an arc contact and a conducting conductor
Of the mover 6 is larger than the inner diameter of the mover 6,
Is inserted into the arc contact 5, the tip of the mover 6 spreads as shown by the broken line in the figure, and the contact force is obtained by the spring property of the element of the mover. An arc is generated when the disconnector begins to open and the mover 6 moves away from the arc contact 5, but the arc at the time of interruption is transferred to the tank because the arc of the mover approaches the central axis of the disconnector because the tip of the mover is narrowed. It is difficult to elongate, and the insulation performance to the ground at the time of shutoff can be achieved with a smaller tank inner diameter. The mover 6 has a slit in the vicinity of the contact in the axial direction in the same manner as the contact, and the arc contact 5
It has a spring property that spreads when it is inserted into the device.

In this embodiment, a fixed-side conductor 2 and a cylindrical movable-side conductor 3 are provided in a grounded metal case 1 filled with an insulating gas. Fixed side shield 8 and arc contact 5 serving as a conductive rod connected to the fixed side conductor on the inner periphery of the shield
The cylindrical movable-side conductor 3 includes a cylindrical movable-side contact 4a provided at a tip end thereof and a cylindrical movable-member 6 provided movably in the movable-side conductor.
The conductor between the conductors is turned on and off by the contact between the tip of the outer peripheral surface of 5 and the tip of the inner peripheral surface of the cylindrical mover 6.

According to this embodiment, it is possible to obtain a gas insulated disconnector capable of reducing the number of components of the disconnector and realizing miniaturization while ensuring reliability. In particular, the number of parts can be reduced and the device can be made compact as compared with a gas insulated disconnector that interrupts the same voltage and the same current.

(Embodiment 4) FIG. 4 is a cross-sectional view of a gas-insulated disconnector in which the mover of the present invention also serves as a contact. shield
Reference numeral 8 denotes a structure that also serves as a conductor, and the inner diameter of the opening of the cylindrical fixed-side shield 8 is smaller than the outer diameter of the tip of the mover.
In addition, the end of the mover can also have the function of a contact by making a cut parallel to the axis, and when the disconnector is closed, the tip of the mover 6 is deformed inward by the shield 8 and the mover A contact force between the mover 6 and the shield 8 can be obtained by the spring property of the element.

In this embodiment, a fixed-side conductor 2 and a cylindrical movable-side conductor 3 are provided in a grounded metal case 1 filled with an insulating gas. A side shield 8 is provided, and the cylindrical movable-side conductor 3 includes a cylindrical movable-side contact 4a provided at a tip end thereof and a cylindrical movable element 6 movably provided in the movable-side conductor. Conduction and interruption between conductors are performed by contact between the inner peripheral end of the side shield and the outer peripheral end of the mover.

According to this embodiment, it is possible to obtain a gas insulated disconnector capable of reducing the number of components of the disconnector and realizing miniaturization while ensuring reliability. In particular, the number of parts can be reduced and the device can be made compact as compared with a gas insulated disconnector that interrupts the same voltage and the same current.

(Embodiment 5) FIG. 5 is a sectional view of a gas-insulated disconnector according to the present invention, in which a shield is not provided on the fixed side and an arc contact also serves as a conductor. In this embodiment, an arc contact 5 made of a conductive rod provided at the tip of a fixed-side conductor is placed in a grounded metal case 1 filled with an insulating gas.
And a cylindrical movable contact 4a provided at the tip of the cylindrical movable conductor 3 and a cylindrical movable element 6 movably provided in the movable conductor. The current between the conductors is turned on and off by contact with the inner peripheral surface tip of the cylindrical mover.

This embodiment is an example in which the fixed-side contact and the shield are omitted, and the fixed side can be greatly simplified. In addition, the arc contact 5 on the fixed side of the disconnector and the fixed-side conductor 2 can be integrated, and the number of parts can be reduced. The blocking performance can also be satisfied.

[0029]

According to the present invention, while ensuring reliability,
A gas-insulated disconnector capable of reducing the number of parts of the disconnector and realizing miniaturization is obtained. In particular, the number of parts can be reduced and the device can be made compact as compared with a gas insulated disconnector that interrupts the same voltage and the same current.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gas-insulated disconnector in which a contact of the present invention also serves as a shield.

FIG. 2 is a cross-sectional view of a gas-insulated disconnector provided with an arc contact in which a contact of the present invention also serves as a shield.

FIG. 3 is a cross-sectional view of a gas-insulated disconnector in which the mover of the present invention also serves as a contact.

FIG. 4 is a cross-sectional view of a gas-insulated disconnector in which the mover of the present invention also serves as a contact.

FIG. 5 is a cross-sectional view of a gas-insulated disconnector in which the mover of the present invention also serves as a contact.

FIG. 6 is a conceptual diagram of an arc generated when the gas insulated disconnector is cut off.

FIG. 7 is a diagram showing the influence of the gap length of the gas insulated disconnector and the radius of the tank on the ground insulation at the time of shutoff.

[Explanation of symbols]

1: ground tank, 2: fixed side conductor, 3: movable side conductor,
4, 4a, 4b: contact, 5: arc contact, 6: mover, 7: mover guide, 8: shield.

Claims (8)

[Claims] A fixed-side conductor and a movable-side conductor are provided in a metal case filled with an insulating gas and grounded, and the fixed-side conductor has a cylindrical fixed portion having a radially flexible portion at a distal end thereof. A side contact is provided, the movable-side conductor comprises a cylindrical movable-side contact at a tip end thereof and a movable element movably so as to contact the inside of the movable-side conductor with the cylindrical fixed-side contact, A gas-insulated disconnector, wherein current is conducted between the conductors by contact between the inner peripheral surface of the fixed contact and the outer peripheral surface of the movable element. 2. A fixed-side conductor and a movable-side conductor are provided in a metal case filled with an insulating gas and grounded. A conductive rod connected to the fixed-side conductor at an inner peripheral portion thereof, wherein the movable-side conductor has a cylindrical movable-side contact provided at an end thereof and the cylindrical fixed-side contact within the movable-side conductor; A cylindrical movable element having flexibility in the radial direction movably so as to be in contact with the movable element, and energizing between the conductors by contact between the conductive rod outer peripheral surface tip and the cylindrical movable element inner peripheral surface tip. A gas insulated disconnector characterized by performing. 3. A fixed-side conductor and a movable-side conductor are provided in a grounded metal case filled with an insulating gas, and the fixed-side conductor has a cylindrical fixed-side shield at its tip and an inner periphery of the shield. A conductive rod connected to the fixed-side conductor, the movable-side conductor having a cylindrical movable-side contact at a tip end thereof and the inside of the movable-side conductor being in contact with the cylindrical fixed-side contact. A cylindrical movable element movably having flexibility in the radial direction, wherein electricity is supplied between the conductors by contact between the distal end of the outer peripheral surface of the conductive rod and the distal end of the inner peripheral surface of the cylindrical movable element. Gas insulated disconnector. 4. A fixed-side conductor and a movable-side conductor are provided in a grounded metal case filled with an insulating gas, and the fixed-side conductor is provided with a cylindrical fixed-side shield at a tip end thereof. The side conductor includes a cylindrical movable contact at a distal end thereof and a cylindrical movable element movably contacting the inside of the movable conductor with the cylindrical fixed contact. A current is supplied between the conductors by contact between the conductor and a tip of an outer peripheral surface of the mover. 5. A fixed-side conductor and a movable-side conductor are provided in a grounded metal case filled with an insulating gas, and the fixed-side conductor is provided with a conductive rod at a tip end thereof, and said movable-side conductor is provided. Has a cylindrical movable contact at a tip thereof and a cylindrical movable element movably so as to contact the inside of the movable conductor with the fixed cylindrical contact, and has an outer peripheral surface tip of the conductive rod and a cylindrical movable contact. A gas-insulated disconnector, wherein current is supplied between the conductors by contact with a tip of an inner peripheral surface of a mover. 6. The gas-insulated disconnector according to claim 1, wherein the fixed-side contact and the movable-side contact have cuts parallel to the axial direction and have a spring property. . 7. The fixed contact, the movable contact, the movable element and at least one of the contact portions of the conductive rod, which are in contact with each other, are made of a conductive metal and the metal. A gas-insulated disconnector comprising a member having an arc-resistant metal having a higher melting point. 8. The metal case according to claim 1, wherein the metal case has a cylindrical shape, and (radius of the metal case) /
A gas-insulated disconnector, wherein the ratio of (the distance between the fixed contact and the movable contact at the distal end) is 2 to 3.