JPH0883541A - Gas insulated switch - Google Patents

Abstract

(57) [Summary] [Purpose] The most appropriate self-weight canceling force can be obtained according to the characteristics of individual switches that differ due to finger contact force, frictional force of the rotating seal, etc. Obtain a gas-insulated switch with easy management and high reliability. [Configuration] A movable electrode 2 and a fixed electrode 3 are provided in a grounded container 1. The movable contactor 4 that opens and closes between the electrodes is attached to the operating device 1
It is driven by the opening / closing mechanism 8 having 0 as a drive source. The main shaft 9 of the opening / closing mechanism 8 is provided with a spiral spring 11 that reduces the weight of the movable portion. The spring force of the spiral spring 11 can be adjusted according to the weight of the movable portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switch used in a gas-insulated switch, and more particularly to a gas-insulated switch provided with a self-weight canceling spring to reduce the weight of the movable part of the switch. Regarding

[0002]

2. Description of the Related Art In recent years, in substations and switchyards in and around large cities, electrical equipment such as circuit breakers, transformers, current transformers, disconnectors, etc. have been housed in tanks filled with insulating gas. The gas-insulated switchgear is widely used, which has a three-dimensional layout to greatly reduce the site area and improve reliability.

The gas-insulated switch used in such a gas-insulated switchgear is constructed as shown in FIG. That is, the movable electrode 2 and the fixed electrode 3 are arranged in the grounded container 1 in which an insulating gas is sealed, and the movable contactor 4 is provided between these electrodes so as to be able to come into contact with and separate from the fixed electrode 3. The tip is in contact with the fixed electrode 3.

The movable contactor 4 is connected via an insulating rod 5 to an operating device 10 provided outside the grounded container 1. That is, the insulating rod 5 is connected to the link 6 in the opening / closing mechanism 8.
And a lever 7 is connected to the main shaft 9 of the opening / closing mechanism.

In the switch thus constructed,
The opening / closing operation is performed by driving the movable contactor 4 up and down via the insulating rod 5, the link 6 and the lever 7.

Generally, the movable part of the switch, which is composed of the movable contact and each member that moves following the movable contact, has a weight of several tens of kilograms, but the diameter of the movable contact increases as the current carrying capacity increases. As a result, the weight of the movable part increases. Further, when the rated voltage becomes high, the inter-electrode dimension G becomes long in order to secure the required insulation distance, and the length of the movable contactor also increases, so that the weight of the movable portion also increases.

By the way, the switches constituting the gas insulated switchgear are arranged in various arrangement postures such as upright, inverted and horizontal arrangements. In the case of the upright arrangement as shown in FIG. The weight of the movable portion is added to the driving force during the closing operation, and conversely, the driving force is reduced by the weight of the moving portion during the opening operation. Therefore, as the driving force, a large driving force is required in consideration of the amount that is diminished during the opening operation.
In the switch with the increased weight of the movable part as described above,
There is a problem that the operating device becomes very large.

On the other hand, at the time of closing operation, the weight of the movable part is added, so that the movable part is accelerated more than necessary. Especially, in the case of a switch which requires a high speed opening / closing operation, the acceleration is very large. When stopping this, an extremely large mechanical impact force is generated due to the inertial force.

As described above, the increase in the weight of the movable part of the switch means that the movable part and the drive part of the switch must be large in size and require a large mechanical strength. It was necessary to give sufficient consideration to sex.

In order to solve such problems, to eliminate the influence of the disposition posture of the switch on the operating characteristics, and to obtain a switchgear having a necessary driving force, the switchgear is balanced with the weight of the movable part or movable. It is known that a spring is provided to reduce the weight of the part. This is provided with a spring acting on the main shaft of the opening / closing mechanism in a direction to reduce the weight of the movable part. That is, FIG. 9 shows that the switch is turned on / off by the weight of the movable part and the finger contact forces on the fixed side and the movable side.
This shows the reaction force applied to the opening / closing mechanism during the "cutting". In order to reduce this reaction force, an attempt has been made to reduce the reaction force by providing a cancel spring as shown in FIG.

[0011]

However, in reality, the factors that influence the driving force of the movable electrode include the finger contact force, the frictional force of the rotary seal portion, and the weight change due to the tolerance due to the workability of parts, etc. Various effects such as changes in frictional force can be considered. In particular, as shown in FIGS. 9 and 10, as the reaction force applied to the opening / closing mechanism, the contact force of the fingers cannot be ignored in addition to the own weight of the movable portion,
The number of the fingers is increased with the increase of the energizing current, the contact force is increased, and the frictional force due to the contact force is extremely increased. In addition, the packing and seal ring of the rotary seal part must also take into consideration the effects of heat and temperature.

Further, in a switchgear in which a phase-separated switch is driven by a single drive through a connecting link, these values are tripled, so changes other than the weight of the movable part should be ignored. I can't. As described above, regarding the operating characteristics of the switch, there is a problem in that each gas-insulated switchgear exhibits slightly different characteristics, making it difficult to control the characteristics of the equipment.

Further, in a switch having a current interrupting duty, the current interrupting performance is related to the opening speed, and at worst, the speed for interrupting the current cannot be ensured, and the basic performance of the switch is reduced. There was a risk that one would be damaged.

The present invention has been proposed in order to solve the above-mentioned drawbacks of the prior art, and its purpose is to provide a spring of a self-weight canceling spring provided to balance or reduce the weight of the movable part. An object of the present invention is to provide a gas-insulated switch which can adjust the force and can easily manage the characteristics of the device.

[0015]

In order to achieve the above object, the invention of claim 1 provides a movable electrode and a fixed electrode in a grounding container filled with an insulating gas, and a movable contact is provided between both electrodes. In the gas-insulated switch in which the child is arranged to be openable and closable, an opening / closing mechanism for driving the movable contactor is connected, and an operating device serving as a driving source thereof is connected to the opening / closing mechanism, Is provided with a self-weight canceling spring that acts in a direction that balances with or reduces the weight of the movable part when the movable contactor is opened and closed, and the spring force of the self-weight canceling spring can be adjusted.

According to a second aspect of the present invention, a movable electrode and a fixed electrode are provided in a grounded container filled with an insulating gas, and a movable contactor is arranged between the two electrodes so that the movable contactor can be opened and closed. A gas-insulated switch in which an opening / closing mechanism for driving this is connected, and an operating device serving as a drive source is connected to the opening / closing mechanism, is the operating device balanced with the weight of the movable part when the movable contact is opened / closed? Alternatively, a self-weight canceling spring that acts in a direction to reduce the weight of the movable portion is provided, and the spring force of the self-weight canceling spring can be adjusted.

The invention of claim 3 is characterized in that the self-weight canceling spring is a spiral spring.

The invention of claim 4 is characterized in that the self-weight canceling spring is a coil spring.

[0019]

In the present invention having the above structure,
Depending on the characteristics of each gas-insulated switch and various factors that affect the driving force on the movable electrode, it is composed of a spiral spring, a coil spring, etc. provided in the opening / closing mechanism or the operating device that drives the opening / closing mechanism. It is possible to adjust the spring force of the self-weight canceling spring. As a result, it is possible to obtain an appropriate driving force for the movable part, and as a result, it is possible to obtain a low-output type gas-insulated switch which is less affected by the weight of the movable part.

[0020]

Embodiments of the present invention will be specifically described below with reference to the drawings. The same parts as those of the prior art shown in FIGS. 7 and 8 are designated by the same reference numerals and the description thereof will be omitted.

(1) First Embodiment FIG. 1 and FIG. 2 In this embodiment, a main shaft 9 of the opening / closing mechanism is provided inside the opening / closing mechanism 8 provided in the grounding container 1. The main shaft 9 is connected to an operating device 10 outside the ground container 1. The main shaft 9 is a bearing 9a, 9 fixed to the grounding container 1.
It is rotatably supported by b, and its own weight cancel spring is provided at the end of the main shaft 9. This self-weight canceling spring is constituted by a spiral spring 11 in this embodiment, and is attached so that a spring force acts in the direction of pulling up the movable contact 4 in FIG.

That is, as shown in the enlarged perspective view of FIG. 2, one end of the spiral spring 11 is fixed to the main shaft 9, and the other end is fixed to a support member 22 provided in a fixed portion of the opening / closing mechanism 8. In this case, a long hole is provided in a place where the support member 22 is fixed (on the fixed portion side of the opening / closing mechanism), and the support member 22 is bolted to the long hole 23 to adjust the position of the support member 22 back and forth. It is configured to be possible. As means for adjusting the spring force of the spiral spring 11, in addition to moving the support member 22 as described above, the screwing positions of the support member 22 and the end of the spiral spring 11 may be bolts or washers. You can also use the ones that change using.

According to this embodiment having such a structure, the movable contactor 4 of the switch is always urged by the restoring force (spring force) of the spiral spring 11 in a direction to reduce its weight. Therefore, the spiral spring 11 is tightened when the switch is closed, and the weight of the movable part is reduced by the restoring force acting on the spring, so that a large inertial force is not generated in the movable part and the movable part is stopped. Occasionally a large mechanical impact force does not occur. On the other hand, during the shutoff operation, the restoring force of the spiral spring 11 acts in addition to the driving force from the operating device 10, so that the driving force on the operating device 10 side can be reduced.

Further, when the weight of the movable part is excessive and the closing speed is fast, that is, when the spring force is too strong, the fixing position of the support member 22 in FIG. 2 is adjusted in the winding direction of the spiral spring 11, while the breaking speed is increased. When the speed is fast, that is, when the spring force is too strong, the fixed position of the support member 22 is set in the opposite direction to the winding to minimize the ratio of operating energy required to "make" and "break" the switch. can do.

(2) Second embodiment: FIGS. 3 and 4 In this embodiment, instead of the spiral spring provided at the end of the main shaft of the opening / closing mechanism 8 in the first embodiment, a coil spring 12 is used as a dead weight cancel spring. It was used. As shown in the enlarged view of FIG. 4, the coil spring 12 is a support member provided at the tip of the lever 32 fixed to the end of the main shaft 9 and the fixed portion of the opening / closing mechanism (the end of the grounding container 1 in FIG. 1). Three
It is provided between 3 and. In this case, the lever 32 may be fixed to the main shaft 9 by fitting or welding, or may be integrally connected using a key or the like. Further, as a means for attaching the supporting member 33 to the grounded container 1 so that the fixing position thereof can be adjusted, a combination of the elongated hole and the screw inserted therein as in the first embodiment may be used.
In addition, a support member whose length can be adjusted using a bolt nut may be provided between the end of the coil spring 12 and the grounding container 1.

Also in the second embodiment having such a structure, the weight of the movable portion is reduced, so that the opening / closing operation can be easily performed. Further, by adjusting the mounting position of the support member 33 with respect to the fixed portion, the spring force of the coil spring 12 can be adjusted according to the characteristics of each switch.

(3) Third Embodiment FIG. 5 In this embodiment, a spiral spring that acts as a dead weight cancel spring on the main shaft portion of the operating mechanism 10 provided outside the grounding container 1 for driving the opening / closing mechanism 8. 11 is provided. That is, in FIG. 5, reference numeral 41 is an operation box which is a case of the operation device 10. A drive spring 44 for driving the main shaft 51 and a motor 42 for accumulating the drive spring are provided in the operation box 41. A speed reducer 45, an eccentric shaft 46, a wheel 47, and a link 4 for converting the driving force of the motor 42 into the spring force of the driving spring 44 are provided between them.
8, a lever 49 and a ratchet 43 are provided. Further, in order to transmit the force on the side of the motor 42 to the drive spring 44 and the stored force of the drive spring 44 to the outside of the operating device 10 via the main shaft 51, the main shaft 51 is connected to the connecting cams 50,
52 and 53 are provided.

In the present embodiment, the spindle 5 of the operating device 10 is
A spiral spring 11 is fixed to one end of the coil 1. The spiral spring 11 has a structure similar to that shown in FIG. 2, and although not shown, its support member is fixed to the fixed member on the operation box 41 side so that its mounting position can be adjusted. ing.

In the present embodiment having such a configuration, the spring force of the spiral spring provided on the main shaft 51 of the operating device 10 is transmitted from the main shaft of the operating mechanism to the main shaft 9 of the opening / closing mechanism, so that the first As in the second embodiment, the function of canceling the dead weight of the movable portion works. Further, since the fixed position of the support member of the spiral spring is movable with respect to the operation box 41, the spiral spring 11
The spring force of can be adjusted. Therefore, the same effects as those of the first and second embodiments are exhibited. In addition, the operating device 10
Is generally outside the grounded container 1, and therefore, there is also an advantage that the spring force can be adjusted without considering gas treatment.

(4) Fourth Embodiment FIG. 6 In this embodiment, a coil spring 12 is used instead of the spiral spring 11 in the third embodiment. Also in this embodiment, one end of the coil spring 12 for canceling its own weight is fixed to the lever 32 provided on the main shaft 51 of the operating device 10 located in the operation box 41. The other end of the coil spring 12 is fixed to the operation box 41 side, but the fixing position is adjustable.

Also in this embodiment having such a configuration, the self-weight canceling function of the movable portion works as in the third embodiment, and the fixed position of the coil spring 12 can be adjusted. The spring force can be adjusted according to.

[0032]

As described above, according to the present invention, since the opening / closing mechanism and the operating device thereof are provided with the canceling spring for the weight of the movable part, the switch having a large moving part weight and a long stroke can be operated at a high speed in the vertical direction. It is possible to provide a gas-insulated switch using a low-output type operating device which is not so much influenced by the weight of the movable part when operated. Further, since the present invention is capable of adjusting the spring force of the self-weight canceling spring, it is most suitable according to the characteristics of individual switches which are different due to the finger contact force, the frictional force of the rotary seal portion, and the like. It is possible to obtain a high self-weight canceling force, the characteristic management of the equipment is facilitated, and a highly reliable gas-insulated switch can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a gas insulated switch according to the present invention.

FIG. 2 is an enlarged plan view of the spiral spring according to the first embodiment.

FIG. 3 is a sectional view showing a second embodiment of the gas insulated switch according to the present invention.

FIG. 4 is an enlarged plan view of a coil spring according to a second embodiment.

FIG. 5 is a perspective view of the inside of the operating device according to the third embodiment of the present invention.

FIG. 6 is a perspective view of the inside of an operating device according to a fourth embodiment of the present invention.

FIG. 7 is a sectional view showing an example of a conventional gas-insulated switch.

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is a graph showing a reaction force at the time of opening and closing in a gas-insulated switch having no self-weight canceling spring.

FIG. 10 is a graph showing a reaction force at the time of opening / closing in a gas insulated switch having a self-weight cancel spring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Grounding container 2 ... Movable electrode 3 ... Fixed electrode 4 ... Movable contactor 5 ... Insulating rod 8 ... Opening / closing mechanism 9 ... Opening / closing mechanism main shaft 9a, 9b ... Bearing 10 ... Operating device 11 ... Spiral spring 12 ... Coil spring

Claims (4)

[Claims] 1. A movable electrode and a fixed electrode are provided in a grounded container filled with an insulating gas, a movable contactor is arranged between the two electrodes so that the movable contactor can be opened and closed, and the movable contactor is opened and closed by driving it. A gas-insulated switch in which a mechanism is connected and an operating device serving as a drive source thereof is connected to the opening / closing mechanism, wherein the opening / closing mechanism equilibrates with the moving part weight when the movable contactor is opened or closed, or A gas-insulated switch characterized in that a self-weight canceling spring that acts in a reducing direction is provided, and the spring force of the self-weight canceling spring can be adjusted. 2. A movable electrode and a fixed electrode are provided in a grounded container filled with an insulating gas, a movable contactor is arranged between the two electrodes so as to be openable and closable, and the movable contactor is opened and closed to drive the movable contactor. A gas-insulated switch in which a mechanism is connected and an operating device serving as a drive source thereof is connected to the opening / closing mechanism, wherein the operating device is equilibrated with the moving part weight when the movable contactor is opened or closed, or the moving part weight is A gas-insulated switch characterized in that a self-weight canceling spring that acts in a reducing direction is provided, and the spring force of the self-weight canceling spring can be adjusted. 3. The gas insulated switch according to claim 1, wherein the deadweight cancel spring is a spiral spring. 4. The gas insulated switch according to claim 1, wherein the self-weight canceling spring is a coil spring.