JPH1083748A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve breaking performance without enlarging a device by energizing it by spring force smaller than contact frictional force of contactors. SOLUTION: A fixed side arc contactor 21 is arranged so as to be movable in the contacting-separating direction. It is energized in the separating direction by force smaller than contact frictional force of the fixed side arc contactor 21 and a movable side arc contactor 26 by a spring member 24. Therefore, a contact part 23b and a contactor 26a of both arc contactors 21 and 26 move while being brought into contact with each other, and the spring member 24 is compressed to energy storage. When a movement advances, since a movement in a cylinder part 22 of the fixed side arc contactor 21 is regulated, in the contactor 23b and the contactor 26a, only the movable side arc contactor 26 to be opened moves in the arrow direction. That is, it moves in the separating direction, and relative opening speed of the fixed side arc contactor 21 and the movable side arc contactor 26 is increased, and rising speed of a withstand voltage value between both electrodes 25 and 30 also increases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch such as a puffer type gas circuit breaker used in a substation or a switchgear of an electric power system, and more particularly to a fixed arc contact for improving the breaking performance. It is about the structure of the child.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view showing the structure of a main part of a conventional puffer type gas circuit breaker of this kind disclosed in Japanese Patent Publication No. 7-38290. In the drawing, reference numeral 1 denotes a metal container filled with an arc-extinguishing gas 2 and grounded, and 3 denotes a cylindrical shape from the outer peripheral side of a radial rib 4 provided with a gas flow path so that the left and right gases can flow freely. Fixed-side main contact having a contact 3a formed at the tip, and a rib 4
The fixed-side arc contact is formed so as to protrude from the center of the fixed-side main contact 3 in the same direction as the fixed-side main contact 3, and has a contact 5 a at the tip, and forms the fixed-side electrode 6 together with the fixed-side main contact 3. I have.

[0003] Reference numeral 7 denotes a concentric arrangement with the fixed-side arc contact 5, and a contact 7 a is formed on one end of the fixed-side arc contact 5 so as to be able to come in contact with and separate from the contact 5 a of the fixed-side arc contact 5. A cylindrical movable-side arc contact connected to the operation rod 8,
Reference numeral 9 denotes a movable main contact that is provided integrally with the movable arc contact 7 and concentrically with the fixed main contact 3, and has one end contacting with and separating from the contact 3 a of the fixed main contact 3. Possible contacts 9
a, and a cylinder 10 is connected to the other end side concentrically with the operation rod 8, and the movable side arc contact 7
Together, they constitute the movable electrode 11.

[0004] Reference numeral 12 denotes an annular piston whose outer peripheral surface is slidably fitted to the inner surface of the cylinder 10 and whose inner peripheral surface is slidably fitted to the outer surface of the operating rod 8. Reference numeral 13 denotes the operating rod 8, the movable main contact 9, A puffer chamber 14 formed by being surrounded by the cylinder 10 and the piston 12 is an insulating nozzle extending from the inner surface side of the movable main contact 9 so as to surround the movable arc contact 7 and the fixed arc contact 5. , 15 are gaps 1 formed between the inner surface of the insulating nozzle 14 and the outer surfaces of the movable arc contact 7 and the fixed arc contact 5.
6 is a communication hole for communicating the puffer chamber 13 with the puffer chamber 13.

[0005] In the conventional puffer type gas circuit breaker constructed as described above, when the opening operation is started, the operating rod 8 is driven in the direction of the arrow in the figure by a driving mechanism (not shown). The movable-side arc contact 7, the movable-side main contact 9, the cylinder 10, and the insulating nozzle 14 also move in the same direction. Then, first, after the fixed-side main contact 3 and the movable-side main contact 9 are separated, and then, when the fixed-side arc contact 5 and the movable-side arc contact 7 are separated, the fixed-side arc contact An arc is generated between the movable contact 5 and the movable-side arc contact 7.

On the other hand, the puffer chamber 1 formed between the operating rod 8, the movable main contact 9 and the cylinder 10, which move as described above, and the piston 12 whose position is fixed.
3, since the internal volume is reduced by this movement, the internal arc-extinguishing gas 2 is compressed and guided from the communication hole 15 to the insulating nozzle 14 via the gap 16, and the fixed-side arc contact 5
And the movable arc contact 7 is blown against the arc formed. Then, the arc is cooled by the blowing of the arc-extinguishing gas 2 and extinguished, thereby interrupting the current and terminating the opening operation.

[0007]

The conventional puffer type gas circuit breaker is constructed as described above, and the opening operation is performed. Immediately after the current interruption is performed, the fixed side electrode 6 and the movable side electrode 11 are opened. When the withstand voltage value between the electrodes 6 and 11 exceeds the transient recovery voltage, the cutoff is performed dielectrically, and the opening operation ends. The withstand voltage between the electrodes 6 and 11 is determined by the shapes of the electrodes 6 and 11 and the distance between the electrodes 6 and 11. For example, a small current interruption such as a line charging current is generally performed. Immediately after the two electrodes 6 and 11 are separated from each other, that is, when the distance between the two electrodes 6 and 11 is not sufficient, the withstand voltage value between the two electrodes 6 and 11 is necessary in order to reliably perform dielectric interruption. Is required to be higher than the rising speed of the transient recovery voltage, so that the separation speed of the two electrodes 6 and 11 must be increased, and for this purpose, the driving mechanism for operating the movable electrode 11 is driven. It is necessary to increase the force, and there is a problem that the drive mechanism and, consequently, the device are inevitably increased in size.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a switch capable of improving the breaking performance without increasing the size of the device. It is.

[0009]

According to a first aspect of the present invention, there is provided a switch including a fixed-side electrode comprising a fixed-side main contact and a fixed-side arc contact, a fixed-side main contact and a fixed-side arc contact. A movable-side main contact and a movable-side electrode formed of a movable-side arc contact, the fixed-side arc contact being movable in the contact / separation direction and separated from the switch. In this case, the actuator is urged in the direction with a force smaller than the contact friction force with the movable arc contact.

Further, the switch according to claim 2 of the present invention comprises:
In claim 1, the fixed-side arc contact is a cylinder formed concentrically with the fixed-side main contact, a sliding part formed at one end and slidable in the cylinder, and a movable part formed at the other end. The contact member is a contact member that can be brought into contact with and separated from the side arc contact member, and a spring member that is disposed in the cylinder and urges a sliding portion with a force in a detaching direction.

Further, the switch according to claim 3 of the present invention comprises:
According to a second aspect, a buffer means is provided at one end of the contact.

A switch according to a fourth aspect of the present invention includes:
According to a third aspect of the present invention, the shock-absorbing means comprises an airtight chamber formed in the cylinder and having a small volume due to movement of the contact in the detaching direction, and a communication hole communicating between the inside and the outside of the airtight chamber.

Further, the switch according to claim 5 of the present invention comprises:
According to a second aspect of the present invention, the airtight chamber is formed in the cylinder, and a communication hole which penetrates the center of the contact from one end to the other end and communicates the inside and outside of the airtight chamber is provided.

Further, the switch according to claim 6 of the present invention comprises:
According to a fifth aspect, an arc generating means is provided in the airtight chamber.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a sectional view showing a configuration of a main part of a puffer type gas circuit breaker according to Embodiment 1 of the present invention.
3 is a cross-sectional view showing different operation processes of the puffer type gas circuit breaker in FIG. 1, and FIG. 4 shows a configuration of a main part of the puffer type gas circuit breaker according to the first embodiment of the present invention which is different from FIG. It is sectional drawing.

In the drawing, reference numeral 17 denotes a metal container filled with an arc-extinguishing gas 18 and grounded, and 19 denotes an outer peripheral side of a radial rib 20 provided with a gas flow path so that the left and right gases can flow freely. , A fixed main contact 21 having a contact 19a formed at a tip thereof, a projection 21 concentrically projecting from the center of the rib 20 with the fixed main contact 19, and a through hole 22a formed at the tip. Cylinder part 22, a sliding part 23a that penetrates through the through-hole 22a on one end side and is slidable in the cylinder part 22, and a contact part 23b that can contact and separate a movable arc contact (described later) on the other end side, respectively. Formed contact 23
A fixed-side main contact 19 comprising a fixed-side arc contact constituted by a spring member 24 disposed in the cylinder portion 22 and for urging a force in a detaching direction by pressing the sliding portion 23a.
Together, they constitute the fixed electrode 25. Note that the urging force of the spring member 24 is set to a value slightly smaller than the contact friction force between the contact portion 23b and a movable-side arc contact described later.

Reference numeral 26 denotes a concentric arrangement with the fixed-side arc contact 21, and a contact 2 of the fixed-side arc contact 21 at one end.
A contact 26a that can be brought into contact with and separated from the movable arc contact 3 is formed, and the other end side is a cylindrical movable-side arc contact connected to an operation rod 27. A movable main contact arranged concentrically with the main contact 19, and a contact 19a of the fixed main contact 19 at one end.
A contact 28a is formed to be able to come in contact with and separate from the control rod 27, and a cylinder 29 is connected to the other end side concentrically with the operation rod 27, and forms a movable-side electrode 30 together with the movable-side arc contact 26.

Reference numeral 31 denotes an annular piston whose outer peripheral surface is slidably fitted to the inner surface of the cylinder 29 and whose inner peripheral surface is slidably fitted to the outer surface of the operating rod 27. Reference numeral 32 denotes an operating rod 27, a movable main contact 28, A puffer chamber 33 formed by being surrounded by the cylinder 29 and the piston 31 is an insulating nozzle extending from the inner surface side of the movable main contact 28 to surround the movable arc contact 26 and the fixed arc contact 21. Reference numerals 34 designate communication holes for communicating the gaps 35 formed between the inner surface of the insulating nozzle 33 and the outer surfaces of the movable-side arc contact 21 and the fixed-side arc contact 26 with the puffer chamber 32.

Next, the operation of the puffer type gas circuit breaker according to Embodiment 1 configured as described above will be described. First, when the opening operation is started, the operating rod 27 is driven in the direction of the arrow by a drive mechanism (not shown), and the movable-side arc contact 26 also moves in the same direction with this operation. At this time, since the contact friction force between the contact 26a of the movable arc contact 26 and the contact portion 23b of the contact 23 of the fixed arc contact 21 exceeds the biasing force of the spring member 24, FIG. As shown, the contact portions 23b and 26a of the arc contacts 21 and 26 move while maintaining the contact state, and the spring member 24 is compressed and stored.

As the movement further proceeds, the movement of the fixed-side arc contact 21 in the cylinder portion 22 is restricted, and as shown in FIG. 3, the contact portion 23b and the contact 26a are separated and the movable arc contact is opened. Only the contact 26 moves in the direction of the arrow, and at the same time, the fixed-side arc contact 21 released is moved in the direction opposite to the direction of the arrow by the accumulated force of the spring member 24, that is, in the detaching direction. The relative opening speed of the fixed-side arc contact 21 and the movable-side arc contact 26 is increased, and the rising speed of the withstand voltage between the electrodes 25 and 30 is also increased.

As described above, according to the first embodiment, the fixed-side arc contact 21 can be moved in the direction of contact and separation with the movable-side arc contact 26, and the spring member disposed in the cylinder portion 22. 24, the spring member 24 is energized in the initial state of the separating operation of the arc contacts 21 and 26 by urging in the detaching direction with a force smaller than the contact friction force with the movable-side arc contact 26. After the opening, the accumulated arc force causes the fixed-side arc contact 21 to move in the direction opposite to the movement of the movable-side arc contact 26, that is, in the detaching direction, so that the two arc contacts 21 and 26 are relatively separated from each other. Since the speed is increased, the rising speed of the withstand voltage between the two electrodes 25 and 30 can be made higher than the rising speed of the transient recovery voltage without increasing the size of the driving mechanism. Can be improved Kill.

1 to 3 show the case where a compression spring is used as the spring member 24, but a tension spring may be used as the spring member 36 as shown in FIG. The same effect as when a spring is used can be obtained.

Embodiment 2 FIG. FIG. 5 is a sectional view showing a configuration of a main part of a puffer type gas circuit breaker according to Embodiment 2 of the present invention. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. 37
Is formed by a rib 20 and a cylinder portion 22, and a contact 23
This is an airtight chamber whose volume changes to a small value as it moves in the detaching direction, and communicates with the outside through a communication hole 38 formed in the side surface of the cylinder portion 22.

According to the puffer type gas circuit breaker of the second embodiment configured as described above, the airtight chamber 37 is formed in the cylinder portion 22, and the airtight chamber 37 is connected to the outside by the communication hole 38. Therefore, the first embodiment
When the two arc contacts 21 and 26 are separated in the same manner as in the case of, the fixed-side arc contact 21 starts to move in the detaching direction due to the accumulated force of the spring member 24. The volume of the airtight chamber 37 is sequentially reduced by the sliding portion 23a, and the arc-extinguishing gas 18 inside the communication hole 38
The contact 23 and the cylinder 2 are gradually released to the outside.
The impact caused by the collision with 2 is buffered by the high-pressure arc-extinguishing gas 18 remaining in the hermetic chamber 37, so that the life and reliability can be improved with a simple configuration.

In the structure shown in FIG.
By reducing the volume of the airtight chamber 37 formed in the interior 2, the internal gas pressure is increased to cushion the impact due to the collision. For example, a hydraulic dashpot (not shown) is connected to the cylinder section 22. And by connecting to the sliding portion 23a, the impact due to the collision may be buffered, and the same effect as described above can be exerted.

Embodiment 3 FIG. FIG. 6 is a sectional view showing a configuration of a main part of a puffer type gas circuit breaker according to Embodiment 3 of the present invention. In the figure, the same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 39 denotes a cylinder portion 40 protruding from the center of the rib 20 concentrically with the fixed-side main contact 19 and having a through hole 40a formed at the tip, and a cylinder portion 40 and the rib 20, which are formed by a contact member to be described later. The airtight chamber 41 whose volume changes to a small size by the movement in the detaching direction, a sliding portion 42a which penetrates the through hole 40a at one end side and can slide in the cylinder portion 40, and a movable arc contact at the other end side. A contact member 42 formed with a contact portion 42b capable of coming in contact with / separating from 26; a spring member 43 disposed in the cylinder portion 40 to urge a force in a detaching direction by pressing a sliding portion 42a; This is a fixed-side arc contact that includes a communication hole 44 that penetrates the center of the contact 42 from one end to the other end and communicates inside and outside of the airtight chamber 41.

The fixed-side arc contact 39 and the fixed-side main contact 19 constitute a fixed-side electrode 45. The biasing force of the spring member 43 is set to a value slightly smaller than the contact friction force between the contact portion 42b and the contact 26a of the movable arc contact 26.

According to the puffer type gas circuit breaker of the third embodiment configured as described above, the airtight chamber 41 is formed in the cylinder portion 40, and the center of the contactor 42 is moved from one end to the other end. Through the communication hole 44 to allow the airtight chamber 41 to communicate with the outside from the contact portion 42b side. Therefore, when the two arc contacts 39 and 26 are separated as in the case of the first embodiment. , Fixed side arc contact 3
9 starts to move in the detaching direction due to the accumulated force of the spring member 43, and the volume of the airtight chamber 41 is sequentially reduced by the sliding portion 42 a of the contact 42, and the internal arc extinguishing property is increased. Since the gas 18 is ejected from the contact portion 42b side through the communication hole 44, a gas flow is formed between the two arc contacts 39 and 26 to promote cooling of the hot gas after current interruption and to improve the interruption performance. Can be planned.

Embodiment 4 FIG. 7 is a sectional view showing a configuration of a main part of a puffer type gas circuit breaker according to Embodiment 4 of the present invention. In the figure, the same parts as those in each of the first to third embodiments are denoted by the same reference numerals, and description thereof will be omitted. 46 is the fixed side main contact 19 from the center of the rib 20.
The cylinder 47 has a through hole 47a formed at the end thereof, and the cylinder 47 has a through hole 47a. The cylinder 47 is formed of the cylinder 20 and the rib 20. A closed chamber 48, and a sliding portion 49 which is slidably disposed in the cylinder portion 47 through a through hole 47a at one end thereof and in which the portion which comes into contact with the cylinder portion 47 is formed of an insulating member.
a, and a contact 49 having a contact portion 49b formed on the other end thereof, which is capable of coming into contact with and separating from the movable arc contact 26, and a contact portion 49 provided in the cylinder portion 47 to press the sliding portion 49a to be disengaged. A spring member 50 for urging a force in a direction, and a central portion of the contact 49 penetrates from one end to the other end to form an airtight chamber 4.
8 is a fixed-side arc contact made up of a communication hole 51 that communicates the inside and outside of the base 8.

The fixed-side arc contact 46 constitutes the fixed-side electrode 52 together with the fixed-side main contact 19, and the biasing force of the spring member 50 applies the contact between the contact portion 49b and the movable-side arc contact 26. It is set to a value slightly smaller than the contact friction force with 26a. 52 is a rib 2 in the airtight chamber 48.
The fixed side main contact 19 and the movable side main contact 28 are opposed to the zero side and the tip side of the sliding portion 49a of the contact 49, respectively.
Are arc generating means composed of a pair of contacts 52a and 52b arranged to be separated after they are separated.

According to the puffer type gas circuit breaker of the fourth embodiment configured as described above, the airtight chamber 48 is formed in the cylinder portion 47, and the rib 20 side and the contact 49 in the airtight chamber 48 are formed. Since the arc generating means including a pair of contacts 52a and 52b which are separated after the two main contacts 19 and 28 are separated from each other at the tip side of the sliding portion 49a, as shown in FIG. Immediately after both contacts 52
Since an arc 53 is generated between a and 52b, the arc 53 heats the arc-extinguishing gas 18 in the airtight chamber 48 to increase the pressure, and is ejected from the contact portion 49b through the communication hole 51. A gas flow is formed between the two arc contacts 46 and 26 to promote the cooling of the hot gas after the current interruption, thereby improving the interruption performance.

In each of the above embodiments, a puffer type gas circuit breaker has been described as an example. However, the present invention is not limited to this, and may be applied to other switches such as an air circuit breaker. Needless to say, the same effect can be exerted.

[0033]

As described above, according to the first aspect of the present invention, the fixed-side electrode comprising the fixed-side main contact and the fixed-side arc contact, and the fixed-side main contact and the fixed-side arc contact are provided. A switch provided with a movable-side main contact and a movable-side electrode formed of a movable-side arc contact, each of which is provided so as to be capable of being moved toward and away from the fixed-side arc contact. The contact force is smaller than the contact friction force with the movable arc contact, so the rate of rise of the withstand voltage between both electrodes can be increased without increasing the size of the drive mechanism. It is possible to provide a switch that can exceed the speed and can improve the breaking performance.

According to a second aspect of the present invention, in the first aspect, the fixed-side arc contact is a cylinder formed concentrically with the fixed-side main contact, and a cylinder formed at one end and having an inside of the cylinder. A contact formed on the other end of the slidable sliding portion and the movable arc contact and capable of coming into contact with and separating from the movable arc contact; and a biasing force in a detaching direction applied to the sliding portion provided in the cylinder. Since it is composed of a spring member, the rate of increase in the withstand voltage between both electrodes can be higher than the rate of rise of the transient recovery voltage without increasing the size of the drive mechanism, and the breaking performance can be improved. A possible switch can be provided.

According to the third aspect of the present invention, since the buffer means is provided at one end of the contact in the second aspect, it is needless to say that the breaking performance can be improved. Further, it is possible to provide a switch capable of improving the life and reliability with a simple configuration.

According to a fourth aspect of the present invention, in the third aspect, the shock-absorbing means includes an airtight chamber formed in the cylinder and having a small volume when the contact moves in the detaching direction; Because it was composed of a communication hole that communicates inside and outside of the
It is possible to provide a switch capable of improving the life and reliability with a simple configuration as well as improving the breaking performance.

According to a fifth aspect of the present invention, in the second aspect, an airtight chamber is formed in the cylinder, and the center of the contact penetrates from one end to the other end to communicate between the inside and the outside of the airtight chamber. As a result, the rising speed of the withstand voltage between the two electrodes can be made faster than the rising speed of the transient recovery voltage. It is possible to provide a switch capable of promoting the cooling of the hot gas later and further improving the shutoff performance.

According to the sixth aspect of the present invention, since the arc generating means is disposed in the airtight chamber in the fifth aspect, the rising speed of the withstand voltage between the two electrodes can be reduced without increasing the driving force. Not only can the transient recovery voltage rise above the rising speed, but also a gas flow can be formed between the two arc contacts to further promote the cooling of hot gas after current interruption, and further improve the interruption performance. Can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a main part of a puffer type gas circuit breaker according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view showing an operation process of the puffer type gas circuit breaker in FIG.

FIG. 3 is a sectional view showing an operation process of the puffer type gas circuit breaker in FIG. 1 which is different from FIG. 2;

FIG. 4 is a sectional view showing a configuration of a main part of the puffer type gas circuit breaker according to Embodiment 1 of the present invention, which is different from FIG.

FIG. 5 is a sectional view showing a configuration of a main part of a puffer type gas circuit breaker according to Embodiment 2 of the present invention.

FIG. 6 is a sectional view showing a configuration of a main part of a puffer type gas circuit breaker according to Embodiment 3 of the present invention.

FIG. 7 is a sectional view showing a configuration of a main part of a puffer type gas circuit breaker according to Embodiment 4 of the present invention.

FIG. 8 is a cross-sectional view showing a configuration of a main part of a conventional puffer type gas circuit breaker.

[Explanation of symbols]

18 Arc-extinguishing gas, 19 Fixed-side main contact, 21, 3
9, 46 Fixed side arc contact, 22, 40, 47 Cylinder part, 23, 26a, 42, 49 Contact, 23
a, 42a, 49a Sliding part, 23b, 42b, 49b
Contact part, 24, 36, 43, 50 Spring member, 26
Movable arc contact, 28 Movable main contact, 37, 4
1,48 airtight chamber, 38,44,51 communication hole, 52
Arc generating means, 52a, 52b contact, 53 arc.

Claims (6)

[Claims] 1. A fixed-side electrode comprising a fixed-side main contact and a fixed-side arc contact, and a movable-side main contact disposed so as to be able to contact and separate from the fixed-side main contact and the fixed-side arc contact, respectively. And a movable side electrode comprising a movable side arc contact, the fixed side arc contact,
A switch which is movable in a contact / separation direction and is urged in a detachment direction with a force smaller than a contact friction force with the movable arc contact. 2. The fixed-side arc contact is formed on a cylinder formed concentrically with the fixed-side main contact, a sliding portion formed on one end and slidable in the cylinder, and formed on the other end. The movable arc contact is configured by a contact member that is a contact portion that can be brought into contact with and separated from the movable-side arc contact member, and a spring member that is disposed in the cylinder and urges the sliding portion with a force in a detaching direction. The switch according to claim 1, wherein 3. The switch according to claim 2, wherein a buffer means is provided at one end of the contact. 4. The buffer means comprises an airtight chamber formed in the cylinder and having a small volume due to movement of the contact in the detaching direction, and a communication hole communicating between the inside and the outside of the airtight chamber. The switch according to claim 3, characterized in that: 5. An airtight chamber is formed in the cylinder, and a communication hole is provided which penetrates the center of the contact from one end to the other end and communicates inside and outside of the airtight chamber. Switch as described. 6. The switch according to claim 5, wherein an arc generating means is provided in the airtight chamber.