JP2010118363A - Switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a switch capable of avoiding an enlarged diameter of a tank and minimizing a tank diameter if it has the same capacity. <P>SOLUTION: In the switch wherein a blade-type movable contactor 26 extending from a rotary center to a radial direction and reciprocating to make a free end draw a rotary locus and a fixed contactor 20 come in contact with and separated from the movable contactor 26 in a turning range of the movable contactor 26 are housed in a tank 10, a free end 26a of the movable contactor 26 has a shape parallel to the turning locus of the movable contactor 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a switch such as a gas-insulated switchgear, and more particularly to a blade-type movable contact that extends in a radial direction from a rotation center and reciprocates so that a free end forms a rotation locus, and a movable contact The present invention relates to a switch that houses in a tank a fixed contact that contacts and separates from a movable contact within a rotation range.

  In a switch having such a blade-type movable contact, in general, the blade-type movable contact extends in the radial direction from the center of rotation in the tank so that the free end reciprocates in a rotational path. In order to operate, a configuration has been proposed in which a stationary contact that is in contact with and away from the movable contact is disposed within the rotation range of the movable contact. According to this configuration, the positions of the movable contact and the fixed contact can be freely set in the tank, and the degree of freedom of arrangement is increased, so that it is possible to deal with switches of various positional relationships. There are advantages (see, for example, Patent Documents 1 and 2).

JP 60-68518 A JP 2002-110007 A

  However, in the switch as shown in Patent Document 1, the movable support conductor that supports the movable contact and the fixed support conductor that supports the fixed contact extend along the central axis in the tank, and are spaced from each other. Placed parallel to each other. A predetermined ground-to-ground distance (insulation distance) must be provided between the movable support conductor and the tank wall surface, and a predetermined ground-to-ground distance must also be provided between the fixed-side support conductor and the tank wall surface. In addition, since it is necessary to provide a predetermined inter-electrode distance between the movable side support conductor and the fixed side support conductor, the size of the tank is inevitably increased, so that an improvement has been desired. Further, conventionally, an appropriate distance between the movable and fixed-side support conductors has not been studied, and since the tank diameter in the insulation design is determined by the support conductor closer to the tank, an improvement has been desired.

  On the other hand, in a switch as shown in Patent Document 2 in which a plurality of energizing members that are in contact with the movable contact are provided side by side in the radial direction of the rotation locus of the movable contact, the opening of the fixed contact rotates. It is formed to extend in the radial direction of the trajectory.When the capacity of the switch is increased and the number of current-carrying members increases, the stationary contact becomes longer in the radial direction of the rotational trajectory, and the tank becomes larger. Therefore, improvement was desired.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a switch capable of avoiding an increase in tank diameter and minimizing the tank diameter if the capacity is the same. And

  In order to solve the above-described problems and achieve the object, the switch according to the present invention is a blade-type movable contact that extends in the radial direction from the rotation center and reciprocates so that the free end forms a rotation locus. In a switch that houses a contact and a stationary contact that is in contact with and away from the movable contact within the range of rotation of the movable contact in a tank, the free end of the movable contact follows the rotational trajectory of the movable contact. It is characterized by forming a shape.

  According to the present invention, since the free end of the movable contact forms a shape along the trajectory of the movable contact, the concentration of the electric field generated at the free end when the movable contact is in a voltage applied state can be reduced. The rotation range of the child can be relaxed without increasing, the increase in the tank diameter can be avoided, and the tank diameter can be minimized with the same capacity.

1 is a cross-sectional view of a switch according to a first embodiment of the present invention taken along a plane along the main bus. FIG. 2 is a cross-sectional view of the switch according to the first embodiment of the present invention on a plane along the insulating operation axis of the first embodiment. FIG. 3 is a cross-sectional view of the fixed contact on the plane including the rotation locus of the free end of the movable contact. FIG. 4 is a side view of the fixed contact of FIG. FIG. 5 is a longitudinal sectional view of a switch according to a second embodiment of the present invention. FIG. 6 is a diagram that also serves as an arrow cross-sectional view along the line BB in FIG. 5 and an arrow cross-sectional view along the line CC. FIG. 7 is a diagram for explaining the angle of the movable contact at each of the fully opened position, the completely closed position, and the ground contact position. FIG. 8 is a longitudinal sectional view of the switch according to the third embodiment of the present invention. FIG. 9 is a diagram illustrating the angle of the movable contact at each of the fully open position and the fully closed position.

  Embodiments of a switch according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
1 is a cross-sectional view of a switch according to a first embodiment of the present invention taken along a plane along the main bus. FIG. 2 is a cross-sectional view taken along a surface along the insulating operation axis of the switch. The tank 10 forms an airtight space in which an opening communicating with another tank is partitioned by an insulating spacer 12. This sealed space is filled with an insulating gas such as sulfur hexafluoride gas. In the tank 10, a three-phase main bus 11 arranged so as to extend in the horizontal direction is accommodated. A fixed contact 20 is disposed on each phase of the main bus 11 via a fixed support conductor 21 and a connection conductor 22. In addition, three grounding stationary contacts 23 are arranged at other positions in the tank 10 via grounding stationary support conductors 25 and connection conductors 22.

  At another position in the tank 10, three movable support conductors 28 supported from the insulating spacer 12 by the spacer connection conductor 29 extend toward the center of the tank 10. As shown well in FIG. 2, the distal end portion of the movable support conductor 28 is formed as a slit-equipped conductor 27 in which a slit is formed to be bifurcated. An insulating operation shaft 30 is disposed in the slit conductor 27 so as to penetrate the three slit conductors 27 at a time. The insulating operation shaft 30 is rotatably supported while being insulated from the slit conductor 27 by an insulator surrounding itself.

  A blade-type (plate-like) movable contact 26 supported by the insulating operation shaft 30 is provided on each slit-equipped conductor 27. The movable contact 26 has a substantially elongated plate shape extending in the radial direction from the rotation center, and rotates so that the free end 26a draws the rotation locus L with the insulating operation shaft 30 as the rotation center. Then, the free end 26 a at the tip is brought into contact with the fixed contact 20 or brought into contact with the grounding fixed contact 23. As shown well in FIG. 1, the movable contact 26 rotates as indicated by an arrow Q in the drawing around the fully open position housed in the slit, and is in a fully closed position where it contacts the fixed contact 20. A reciprocating operation is performed between the ground contact position and the ground contact position. The fixed contact 20 is disposed on one end side of the rotation range of the movable contact 26, and the grounding fixed contact 23 is disposed on the other end side of the rotation range. The rotation angle from the slit conductor 27 to the fixed contact 20 is the same as the rotation angle from the slit conductor 27 to the grounding fixed contact 23.

  The fixed contact 20 and the grounding fixed contact 23 each have a substantially U-shaped cross section in which an opening 20a into which the movable contact 26 enters is formed, and each of the openings 20a extends in the direction of the insulating operation shaft 30. It is arranged toward. The fixed contact 20 and the grounding fixed contact 23 have substantially the same structure, and the structure of the fixed contact 20 will be mainly described below.

  FIG. 3 is a cross-sectional view of the fixed contact on the plane including the rotation locus of the free end of the movable contact. 4 is a side view of the fixed contact shown in FIG. The stationary contact 20 has a pair of energization members 31 arranged in pairs and facing substantially parallel to each other with the front end directed toward the opening 20a, and a support frame 33 that supports the base portion of the energization member 31 in a tiltable manner. And a leaf spring 43 that urges the energizing member 31 in a direction in which the front end portions approach each other, and an outer frame 45 that covers the periphery of the energizing member 31, the support frame 33, and the leaf spring 43 and shields from an external electric field. Yes.

  Two energization members 31 are paired and arranged in a C shape, and further, six pairs of the C shape are provided side by side with a predetermined interval in the direction of the rotation locus L of the movable contact 26. Yes. That is, twelve current-carrying members 31 are arranged in two rows of 6 sheets each with the main surface in parallel. The six energizing members 31 each forming a row are collectively supported by a support bar 35 that is inserted through a through hole drilled in the base. The support bar 35 is loosely fitted in the through hole of the energizing member 31 and is fastened to the support frame 33 by a fastening member 37. With this structure, the energizing member 31 is supported so as to be tiltable, and the separation interval (opening width) of the front end portion of the energizing member 31 is changed in size.

  The outer frame 45 is made of, for example, a casting having a high degree of freedom in shape and effective in shielding an electric field, and constitutes an outer shell of the fixed contact 20. The outer frame 45 includes the current-carrying member 31, the support frame 33, and the leaf spring 43. An opening 20a into which the blade-type movable contact 26 enters is formed at a position corresponding to the gap between the tips of the current-carrying members 31 arranged in a substantially box shape covering the periphery and facing each other in parallel. Has been. Two sets of retaining members 41 including screws and washers are inserted from the opening 20 a of the outer frame 45 and fastened to the protruding portion 22 a of the connection conductor 22.

  As shown well in FIG. 3, the free end 26 a of the movable contact 26 has a shape along the rotation locus L of the movable contact 26. By setting it as such a shape, the electric field of the free end 26a at the time of the movable contact 26 rotating in a voltage application state can be relieved, without increasing the rotation range. In addition, when the free end 26a is a rectangle, since an electric field concentrates on a corner | angular part, it is unpreferable.

Embodiment 2. FIG.
FIG. 5 is a longitudinal sectional view of a switch according to a second embodiment of the present invention. FIG. 6 is a view serving as both a cross-sectional view taken along line BB in FIG. 5 and a cross-sectional view taken along line CC. FIG. 7 is a view for explaining the angle of the movable contact at each of the fully open position, the completely closed position, and the ground contact position.

  In FIG. 5, a tank 10 has a substantially cylindrical shape, and an opening communicating with another tank is partitioned by an insulating spacer 12 to form a sealed space. This sealed space is filled with an insulating gas such as sulfur hexafluoride gas. In the tank 10, three stationary contacts 20 corresponding to three-phase main circuit conductors (not shown) are arranged substantially parallel to each other. The fixed contact 20 has tips of three fixed-side support conductors 21 extending along the axis of the tank 10 from a spacer connection conductor 29 supported by an insulating spacer 12 provided at one end (upper part of FIG. 5) of the tank 10. Are arranged via connection conductors 22. Further, three grounding fixed contactors 23 are disposed substantially parallel to each other via another grounding-side support conductor 25 and connection conductor 22 at another position in the tank 10.

  At another position in the tank 10, three movable support conductors 28 supported by the spacer connection conductor 29 from the insulating spacer 12 at the other end of the tank 10 (lower part in FIG. 5) are on the axis of the tank 10. After extending along, it is bent toward the center. The distal end portion of the movable support conductor 28 is a conductor 27 with a slit which is formed into a forked shape with a slit. An insulating operation shaft 30 is disposed in the slit conductor 27 so as to penetrate the three slit conductors 27 at a time. The insulating operation shaft 30 is rotatably supported while being insulated from the slit conductor 27 by an insulator surrounding itself.

  As in the first embodiment, the stationary contact 20 and the grounding stationary contact 23 have a substantially U-shaped cross section in which an opening into which the movable contact 26 enters is formed. It is arranged toward the direction of the insulating operation shaft 30.

  As described above, FIG. 6 is a view that also serves as an arrow cross-sectional view along the line BB in FIG. 5 and an arrow cross-sectional view along the line CC. That is, the three movable support conductors 28 and the three fixed support conductors 21 have substantially the same diameter, and are arranged on the same straight line O2. As shown in FIGS. 5 and 6, the movable side support conductor 28 and the fixed side support conductor 21 of the present embodiment are on a plane O2 that is parallel to the plane O1 that includes the tank center axis and is separated by a distance l1. Is arranged. The distance between the movable support conductor 28 at both ends close to the inner wall surface of the tank 10 and the tank 10 of the fixed support conductor 21 is set to l2.

  According to the switch according to the present embodiment, the fixed contact 20 is supported by the fixed support conductor 21, and the opening into which the movable contact 26 enters is opposed to the rotation center of the movable contact 26. Further, the movable support conductor 28 and the fixed support conductor 21 are disposed on substantially the same straight line along the tank center axis. As described above, the fixed contact 20 is arranged so that the opening into which the movable contact 26 enters is opposed to the rotation center of the movable contact 26. For example, the number of the energizing members 31 increases and the opening is increased. Even if the width of the portion is increased, it is not necessary to extend the movable contact 26 in the radial direction of the rotation locus, and it is easy to avoid the increase in the tank diameter and increase the capacity. Further, the movable-side support conductor 28 and the fixed-side support conductor 21 are arranged on substantially the same straight line along the tank center axis line, whereby the distance between the movable-side support conductor 28 and the fixed-side support conductor 21 between the tank and the ground. (Insulation distance) can be made equal, and the diameter of the tank 10 can be minimized with respect to a predetermined capacity.

  As shown in FIGS. 5 and 7, the angle θ <b> 1 formed by the movable contact 26 in the fully open position accommodated in the conductor 27 with the slit and the tank center axis, and the fully closed position in contact with the fixed contact 20. An angle θ1 formed by a certain movable contact 26 and the tank center axis is made equal. Thereby, the positional relationship between the movable side support conductor 28 and the fixed side support conductor 21 connected to the movable contact 26 or the slit conductor 27 can be simplified, and the structure can be simplified. It has been.

  Further, the fixed contact 20 is disposed on one end side of the rotation range of the movable contact 26, and the grounding fixed contact 23 is disposed on the other end side of the rotation range. The center P is on the tank center line. With this configuration, the diameter of the tank 10 can be reduced so that the insulation distance between the free end 26a of the movable contact 26 is equal between the fixed contact 20 side and the grounding fixed contact 23 side. Yes.

  Furthermore, in the switch according to the present embodiment, the angle formed by the movable contact 26 at the fully open position and the movable contact 26 at the fully closed position, and the movable contact 26 at the fully open position and the grounding position are set. An angle formed by a certain movable contact 26 is θ2 (120 °). In this way, standardization design of the mechanism of the operating device and the connection system is achieved by equalizing the rotation angles. In addition, by making the rotation angles equal in this way, it is possible to coordinate the insulation design between the respective poles (between the electrode with the slit conductor 27) on the fixed contact 20 side and the grounding fixed contact 23 side. . That is, it is possible to avoid the electric field from being concentrated on either side. Furthermore, since the stationary contact 23 for grounding is perpendicular to the tank center axis, it can be attached at a position closest to the tank 10. In this manner, the diameter of the tank 10 is reduced by coordinating the rotation center of the movable contact 26 and the distance between the rotation locus and the ground.

  In addition, although the switch of this Embodiment is applied to a three-phase collective switch, it is useful, but a predetermined effect can be obtained even with a phase separation type (single phase).

Embodiment 3 FIG.
FIG. 8 is a longitudinal sectional view of a switch according to a third embodiment of the present invention. FIG. 9 is a diagram for explaining the angle of the movable contact at each of the fully open position and the fully closed position. The switch according to the present embodiment is a single-phase, that is, a phase-separated switch, but may be applied as a three-phase collective switch. In the tank 10, one movable contact 26 and fixed contact 20 are accommodated. In the present embodiment, the movable side support conductor 28 and the fixed side support conductor 21 are disposed on the substantially central axis of the tank 10.

  The distance between the position of the rotation locus L farthest from the tank center axis and the tank center axis, and the distance between the rotation center P of the rotation locus L and the tank center axis are both W (the rotation locus L of the rotation locus L). The angle formed by the movable contact 26 at the fully open position and the movable contact 26 at the fully closed position is 120 °.

  In the present embodiment, with the above-described configuration, in the phase-separated switch, the movable side support conductor 28 and the fixed side support conductor 21 extending from the insulating spacer 12 are extended in a straight line, so that the inside of the tank 10 The diameter of the tank 10 is reduced by making the distance between the free end 26a side of the movable contact 26 and the rotation center P side substantially equal to each other. Furthermore, by setting the rotation angle to 120 °, the rotation angle can be coordinated with the switch of the second embodiment in which the grounding fixed contact 23 is arranged on the other end side of the rotation range of the movable contact 26. In addition, the standardized design of the mechanism and connection system of the operating device is further promoted.

  As described above, the switch according to the present invention includes a blade-type movable contact that is pivotally supported so as to reciprocate so that a free end forms a rotation locus, and an energizing member that contacts the movable contact. The present invention is useful when applied to a switch provided with a stationary contact.

DESCRIPTION OF SYMBOLS 10 Tank 11 Main bus line 12 Insulating spacer 20 Fixed contact 20a Opening part 21 Fixed side support conductor 22 Connection conductor 22a Protruding part 23 Grounding fixed contact 25 Grounding fixed side support conductor 26 Movable contact 26a Free end 27 Conductor with slit 28 Movable support conductor 29 Spacer support conductor 30 Insulation operation axis (rotary axis)
31 energizing member 33 support frame 35 support rod 37 fastening member 41 retaining member 43 leaf spring 45 outer frame

Claims (8)

A blade-type movable contact that extends in the radial direction from the center of rotation and reciprocates so that the free end forms a rotation trajectory, and a fixed that contacts and separates from the movable contact within the range of rotation of the movable contact In the switch that houses the contact in the tank,
The switch according to claim 1, wherein the free end of the movable contact has a shape along a rotation locus of the movable contact. The movable contact is supported by a movable support conductor,
The fixed contact is supported by a fixed-side support conductor, and an opening into which the movable contact enters is disposed so as to face the rotation center of the movable contact,
The switch according to claim 1, wherein the movable support conductor and the fixed support conductor are arranged on substantially the same straight line along the tank center axis. The fixed contact has a plurality of current-carrying members that come into contact with the movable contact, and a plurality of the fixed contacts are provided side by side in the direction of the trajectory of the movable contact. Switch. The switch according to any one of claims 1 to 3, wherein the movable contact is housed in a conductor with a slit at a fully open position.   An angle formed between the movable contact at the fully open position and the tank center axis is substantially equal to an angle formed between the movable contact at the fully closed position contacting the fixed contact and the tank center axis. The switch according to any one of claims 1 to 4. The switch according to claim 2, wherein the movable support conductor and the fixed support conductor are positioned substantially on the tank center axis. The fixed contact is disposed on one end side of the rotation range of the movable contact, the fixed contact for grounding is disposed on the other end side of the rotation range, and the rotation center of the movable contact is on the tank center line. The switch according to any one of claims 1 to 6, wherein: An angle formed by the movable contact at the fully open position and the movable contact at the fully closed position is 120 °, or the movable contact at the fully open position and the movable contact at the grounding position are formed. The switch according to any one of claims 1 to 7, wherein the angle is 120 °.

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