TWI452787B - Fixing frame of pull-out type breaker - Google Patents

Description

Fixed frame of pull-out type interrupter

The present invention relates to a solid frame in which a pull-out type interrupter is housed and fixed to a casing of a switchboard or the like.

The pull-out type interrupter is inserted from the front side of the frame and placed on the fixed frame, and a primary joint (connection terminal) which is led out from the back side of the interrupter is formed and can be disposed on the back of the fixed frame. The main circuit terminals on the side are separated. When the breaker is moved from the disconnection position of the main circuit terminal of the fixed frame to the connection position of the connection, in order to position the connection position, the interlock pin provided in the breaker is fitted Engage the hole in the fixing frame and fix it.

For the fixing frame of the conventional pull-out type interrupter, for example, a configuration shown in Fig. 10 is known. In the figure, the fixing frame 30 includes a floor panel 32 having a fixed frame rail 31 on the right and left sides, and a side panel 35 supporting the main circuit terminal 33 via the insulating member 34, and a pull-out type interrupter (not shown). Inserted, when the connection terminal on the back side of the fixing frame 30 is moved to the connection position connected to the main circuit terminal 33, the interlock pin attached to the pull-out type interrupter is the interlocking pin insertion hole 36 provided in the floor panel 32. The position is matched with the fitting to perform positioning (refer to, for example, Patent Document 1).

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Laid-Open Patent Publication No. 2002-354616 (page 4, FIG. 1)

As shown in FIG. 10, the interlocking pin insertion hole 36 provided in the fixed frame shown in the above Patent Document 1 is located not on the center line on the left and right but in the eccentric position when viewed from the front side (Fig. 10) The situation is offset to the left position). Although the illustration is omitted in the drawings, the insertion opening of the pull-out type of the pull-out type of the pull-out type is generally located at the center. Therefore, the position of the insertion hole is avoided, and the left and right sides are eccentric. The reason. Therefore, in the case of Patent Document 1, when the pull-out type interrupter is placed on the fixed frame and moved to the connection position, the interlock pin attached to the pull-out type interrupter is at the center of the fixed frame. The position where the line is more eccentric to the left is fixed.

Since the pull-out type breaker functions as a force for tilting forward due to the electromagnetic force when the breaker is short-circuited or short-circuited during an accident, the interlock pin is located to the left side. Since the eccentric position is such that the electromagnetic force acts as a rotational force that rotates to the right with respect to the breaker when viewed from above.

With this rotation force, there is a problem that the contact surface of the primary joint and the main circuit terminal is offset in a direction in which the bite is insufficient. When the bite is insufficient, the problem of arcing may occur depending on the situation. . It is also conceivable to provide the interlocking pin mounting position on both sides of the pull-out type interrupter to prevent the rotational force, but at this time, the structure becomes complicated and the cost becomes high.

In addition, the above-mentioned phenomenon of the rotational force acts, even if the interlock pin is designed to be centered (that is, even if it is not eccentric to the left and right), there is a manufacturing error or a pull-out type interrupter during the insertion operation. Left and right position offset, So it will happen often.

The present invention has been made in view of the above problems, and an object thereof is to suppress a force that is to be rotated about an interlocking pin due to an electromagnetic force when a pull-out type breaker is short-circuited.

The fixing frame of the pull-out type interrupter of the present invention comprises: a floor, and a pair of fixed frame rails on the left and right sides for loading the pull-out type breaker and guiding the movement in the front-rear direction; the main circuit terminal, The upper and lower terminals are connected to and separated from the back side of the pull-out type interrupter; and a pair of side plates for insulatingly supporting the main circuit terminals; and a pull-out type interrupter connected to the main circuit terminals is formed on the floor. a connecting hole is engaged with a locking hole provided in the interlocking pin of the pull-out type interrupter, and is provided with a guiding member for preventing the pull-out type interrupter from being centered on the interlocking pin by electromagnetic force The action of rotating in the horizontal direction.

According to the fixing frame of the pull-out type interrupter of the present invention, since the engagement hole is formed in the floor and the interlocking pin, and the action of preventing the pull-out type interrupter from rotating in the horizontal direction around the interlocking pin is provided. The guiding member thus blocks the pull-out type interrupter placed on the fixed frame, because the large electromagnetic force caused by a large current such as a short circuit is rotated around the interlocking pin, and the pull-out type can be prevented from being blocked. The connection portion between the terminal of the breaker and the main circuit terminal on the side of the fixed frame is defective in biting.

(Embodiment 1)

Hereinafter, the pull-out type cover of the first embodiment of the present invention will be described based on the drawings. The fixed frame of the breaker. Fig. 1 is a side view showing a state in which a pull-out type interrupter is placed on a fixed frame. In addition, Fig. 2 is a plan view of the fixing frame of Fig. 1.

In the following description, a pull-out type vacuum interrupter that has a vacuum valve and is mounted on a trolley and is movable as a pull-out type interrupter will be described as an example.

The vacuum interrupter 1 is configured by mounting a mold frame 3 in which the vacuum valve 2 is housed and a machine frame 4 in which an operation mechanism (not shown) is housed in the bogie 5 . When the vacuum interrupter 1 is placed on the switchboard and placed on the switchboard, the left side of the first figure is the front door side of the switchboard. Therefore, in the following description, the left side of the first figure is the front side. Description.

On the back side of the mold frame 3, a fixed-side terminal that is led up and down and fixed to a fixed-side electrode (not shown) connected to the vacuum valve 2, and a movable side that is connected to a movable-side electrode (not shown) The primary joint 6 formed by the terminal. Further, the movable side electrode is connected to the operation mechanism in the machine frame 4 via a link mechanism (not shown), and when an electric signal is applied to the operation mechanism, the movable side electrode is interlocked with the operation. The fixed side electrodes are separated from each other to open and close the vacuum valve 2.

The fixing frame 7 on which the vacuum interrupter 1 is placed includes a floor panel 8 and a pair of fixed frame rails 9 which are provided in the front-rear direction on the left and right sides of the floor panel 8 for guiding the wheel 5a of the carriage 5; a pair of side panels 10 The upper and lower insulating support members 11 are supported by the side plates 10; and the main circuit terminals 12 are supported by the insulating support members 11. Furthermore, in the floor 8 of the fixed frame 7, As shown in Fig. 2, the position is eccentric from the center line of the left and right (the left side is viewed from the front side in Fig. 2), and a card that engages with the interlocking pin provided on the side of the vacuum interrupter 1 is provided. Hole 8a.

When the position of the interlocking pin is located at an eccentric position to the left and right, since the vacuum interrupter 1 is placed on the fixed frame 7 to be moved, the insertion opening of the insertion/extraction handle of the vacuum interrupter is usually located. The center thus avoids the position of the insertion hole and is eccentric toward either of the left and right sides.

When the vacuum interrupter 1 is housed in the fixed frame 7 from the front side, and the wheel 5a of the carriage 5 is placed in the fixed frame rail 9 and pushed rearward, the primary joint 6 of the vacuum interrupter 1 is insulated and supported. The main circuit terminal 12 on the back surface of the fixed frame 7 is fitted to the connected state shown in Fig. 1 . At this connection position, an interlocking pin (not shown) provided in the vacuum interrupter 1 is fitted to the engaging hole 8a of the floor panel 8 provided in the fixing frame 7, and the vacuum interrupter 1 is fixed to the connection. position. In this state, the vacuum interrupter 1 is connected to the main circuit on the switchboard side through the main circuit terminal 12, and is electrically connectable.

Further, in the present embodiment, as shown in Fig. 2, the upper surface side of the fixed frame rail 9 formed in a cross-sectional U-shape is provided so that when the vacuum interrupter 1 is inserted near the connection position, The guide protrusion 13 (guide member) which is engaged with only a slight gap on the side near the inner corner of the vacuum interrupter 1 is a feature of this point.

The interval d between the left and right guide projections 13 is set to be slightly larger than the width dimension of the rear side of the vacuum interrupter 1.

Next, the action of the guide protrusions 13 configured as described above will be described.

When the vacuum interrupter 1 placed on the fixed frame 7 is in the connected position and the current flows in the direction of the solid arrow in the first figure, in the area surrounded by the flow path along the arrow, a The magnetic field in the direction of the front side of the back side of the paper. Due to the interaction between the magnetic field and the current flowing through the flow path (Fleming's left-hand law), the energized portion of the vacuum interrupter 1 receives the electromagnetic force in the direction of the reverse arrow in the figure. Since the electromagnetic force is proportional to the power of the current flowing through the flow path, when the current flowing through the flow path becomes a large current such as a short-circuit current, an extremely large electromagnetic force is generated.

At this time, the vacuum interrupter 1 placed on the fixed frame 7 is in a state in which only the engaging hole 8a to which the interlocking pin is fitted and the engaging portion of the main circuit terminal 12 of the primary joint 6 are fixed. Since the vacuum interrupter 1 has a fixed portion of an interlocking pin at a position eccentric from the center line when viewed from the left-right direction (the case of FIG. 2 is a left side of the center line), the above-mentioned large electromagnetic force acts as a The vacuum interrupter 1 functions as a force that rotates to the right as viewed from above with the interlock pin as a center. Due to this rotational force, an undesired force is applied to the joint portion once, and a bite is insufficient, and depending on the case, there is a possibility of arcing.

Therefore, in the embodiment of the present invention, as shown in the enlarged view of Fig. 2(b), the plate formed on the upper surface of the fixed frame rail 9 having a cross-sectional U-shape is extended inward, and a tapered portion is applied to the front. The taper is processed to provide a guide protrusion 13 for guiding the insertion of the vacuum interrupter 1 and as a guide member for restricting the play in the lateral direction. The reason why the guide protrusions 13 are provided only in the inner portion of the fixed frame rail 9 is to eliminate the difficulty in inserting the vacuum interrupter 1 when it is inserted into the fixed frame 7.

Further, on the other side of the guide protrusion 13, a stopper 9a is formed.

According to this configuration, when the vacuum interrupter 1 is housed in the fixed frame 7 and is located at the connection position, even if a large current such as a short-circuit current flows, the vacuum interrupter 1 interlocks the pin portion and the inner side. Since the guide protrusion 13 suppresses the operation, it is possible to prevent the lateral displacement by the electromagnetic force, and it is possible to prevent an unnecessary force from being applied to the contact portion with the main circuit terminal 12 of the primary joint 6.

Further, in Fig. 2, although two guide protrusions 13 are provided on the right and left sides, as described above, the rotational force due to the electromagnetic force is higher than the left and right center lines of the fixed frame at the position of the interlock pin. When one is eccentric, since it acts as a rotational force to be rotated on the opposite side of the eccentric side, it is sufficient to provide the center line at at least one position on the opposite side to the right and left of the engagement hole.

Further, in the second drawing, the guide protrusions 13 are formed by extending the plate on the upper surface of the fixed frame rail 9 inward, but may be fixed to the same position by welding or screwing using other members.

Further, the effect of the rotational force caused by the electromagnetic force as described above is of course that the position of the interlocking pin acts at a position of a large eccentricity as shown in Fig. 2, but even if the interlocking pin is Designed in the center, there will be errors in production or shifting of the left and right positions during the insertion operation of the pull-out type of interrupter, so it is a frequent phenomenon even when the interlocking pin is at the center. It is also valid.

As described above, the fixing of the pull-out type interrupter according to the first embodiment The frame has a floor for fixing the frame rail on one of the left and right sides for loading the pull-out type breaker and guiding the movement in the front-rear direction, and the upper and lower terminals can be led out from the back side of the pull-out type breaker. a main circuit terminal that is separated from the main circuit, and a pair of side plates that insulate and support the main circuit terminal, and a floor is formed with a connection position at which the pull-out type breaker is connected to the main circuit terminal and a connection type provided in the pull-out type interrupter The locking pin engages with the engaging hole, and is provided with a guiding member for preventing the pull-out type interrupter from rotating in the horizontal direction by the electromagnetic force centering on the interlocking pin, so that a large current such as a short-circuit current When flowing through the pull-out type interrupter, the guiding member prevents a large electromagnetic force from acting, and the pull-out type interrupter is intended to rotate around the interlocking pin, so that the unnecessary force does not act. In the connection portion of the primary connector of the pull-out type interrupter and the main circuit terminal, the occurrence of biting failure can be prevented, and the arcing can be eliminated.

Further, the engaging hole is formed at a position eccentric from the center line of the right and left sides of the floor, and the guiding member is disposed at a position opposite to the left and right of the engaging hole with respect to the center line, so that the guide can be reduced in addition to the above effects. The number of components and the ease of fabrication and assembly.

Further, since the guide member is configured to be provided on the upper surface side of the fixed frame rail so as to face the side surface near the inner corner portion of the pull-out type interrupter at the connection position with a small gap, Therefore, the guide member can be simply formed by the members constituting the fixed frame rail, and the above effects can be obtained.

(Embodiment 2)

Fig. 3 is a top view showing a fixing frame of the pull-out type interrupter of the second embodiment, and is a portion corresponding to the second drawing of the first embodiment. (a) It is an overall diagram, and (b) is an enlarged view of the main part of (a).

In addition, the side view of the state in which the pull-out type interrupter is placed on the fixed frame is the same as that of the first embodiment of the first embodiment, and the position of the interlock pin is also the same as that of the first embodiment. In the following embodiments, the same portions as those in the first embodiment are denoted by the same reference numerals, and their description will be omitted, and only the main differences will be described.

In the second embodiment, instead of the guide protrusion 13 of the first embodiment, a roller 14 is attached as a guide member. That is, as shown in Fig. 3, the upper surface of the fixed frame rail 9 which is formed on both sides of the fixed frame 7 and which has a U-shaped cross section is provided in the vicinity of the front side of the stopper 9a on the back side. The roller 14 which is rotated in the moving direction of the vacuum interrupter 1 and the inner side of the two rollers 14 are spaced apart to be slightly wider than the width of the rear portion of the trolley of the vacuum interrupter 1. When the vacuum interrupter 1 is in the connection position, the side surfaces of the rear end portions of the trolley 5 are fitted between the two rollers 14, thereby preventing short-circuiting due to short-circuiting of the vacuum interrupter 1 or accident. The rotational force caused by the electromagnetic force at the time of the break. By attaching the roller 14, the guide projection 13 of the first embodiment can be inserted and fitted more smoothly during insertion.

Further, the roller 14 is not necessarily provided on both sides as long as it is provided at a portion on the opposite side of the engaging hole 8a of the interlocking pin located at the eccentric position.

As described above, according to the fixing frame of the pull-out type interrupter of the second embodiment, the guide member is configured to have a small gap and a side surface near the inner corner of the pull-out type interrupter at the connection position. The roller is provided to be rotatable in the moving direction of the pull-out type interrupter, so that the fitting of the pull-out type interrupter to the fixing frame and insertion into the connection position can be made smoother. The same effect as in the first embodiment can be obtained.

(Embodiment 3)

Fig. 4 is a top view of the fixing frame of the pull-out type interrupter of the third embodiment, and shows a state in which the vacuum interrupter 1 is at the connection position and the primary joint 6 is fitted to the main circuit terminal 12. Fig. 5 is a side cross-sectional view taken along line V-V of Fig. 4, and Fig. 6 is a top cross-sectional view taken along line VI-VI of Fig. 5.

Although the feature of this embodiment is not seen in the upper drawing of Fig. 4, as shown in Fig. 5 and Fig. 6, in the present embodiment, it is attached to the rear portion of the trolley 5 of the vacuum interrupter 1. The convex portion 15 is provided at the center portion, and the guide concave member 16 is fixed to the floor panel 8 of the fixing frame 7 opposed to the convex portion 15 by welding or the like as a guiding member. When the vacuum interrupter 11 is in the connected position, the convex portion 15 is fitted into the guide concave member 16.

With such a configuration, it is possible to prevent the rotation force caused by the electromagnetic force from acting on the vacuum interrupter 1 when the short-circuit is blocked, and to prevent the rotation to the right when viewed from above by the electromagnetic force.

Here, the configuration of the unevenness of the convex portion 15 and the guide concave member 16 may be replaced. Fig. 7 is a view showing the state thereof, and is a top view showing the same portion as Fig. 6. As shown in Fig. 7, a guide convex member 17 is provided as a guide member on the floor 8 of the fixed frame 7, and a recess is provided on the side of the carriage 5 of the vacuum interrupter 1 opposed to the guide convex member 17. 18.

Further, although the guide concave member 16 or the guide convex member 17 is provided at one location, it may be provided in a plurality of locations, and the position is not limited to the central portion.

Further, a modification will be described.

Fig. 8 is a top view showing a modification. Here, the convex portion composed of the other members is not provided on the side of the bogie 5 of the vacuum interrupter 1, but the member constituting the bogie 5 itself is used. That is, as shown in the enlarged view of Fig. 8(b), the side plate at the rear end portion of the bogie 5 is a convex portion on the side of the vacuum interrupter 1, and a guide is provided at a position facing the convex portion. The dimple member 19 serves as a guiding member. The guiding concave member 19 is fixed to the floor panel 8. Further, the guide concave member 19 may be provided on the right and left sides, and at least one portion may be provided on the opposite side of the engagement portion with the interlocking pin.

As described above, according to the fixing frame of the pull-out type interrupter of the third embodiment, the guide member is configured to be fitted to the convex portion or the concave portion provided on the back side of the pull-out type interrupter. Since the concave member or the guide convex member is guided to the floor, the guide member can be provided at a relatively free position of the rear portion of the floor of the fixed frame, and the same effect as that of the first embodiment can be obtained.

(Embodiment 4)

Fig. 9 is a top view of the fixing frame of the pull-out type interrupter of the fourth embodiment, and shows a state in which the pull-out type interrupter is at the connection position.

As shown in Fig. 9, in the present embodiment, when the vacuum interrupter 1 is at the connection position, the portion of the right side of the wheel 5a provided on the inner side of the carriage 5 of the vacuum interrupter 1 is fitted. , the wheel guide 20 is provided. The wheel guide 20 is fixed to the floor 8 of the fixed frame 7 by welding or the like.

With this configuration, the vacuum interrupter 1 can be prevented from rotating rightward around the interlocking pin.

The wheel guide 20 may be disposed at two locations at positions corresponding to the left and right wheels, but at least at least on the eccentric side of the engaging hole of the interlocking pin. The outer side of the wheel on the side can be set.

As described above, according to the fixing frame of the pull-out type interrupter of the fourth embodiment, since the pull-out type interrupter has a wheel at the lower portion, and the guide member is configured to be pulled out at the connection position. Since the wheel guide is fitted with the wheel guide, the wheel guide can have both the stopper end of the pull-out type breaker, and the same effect as that of the first embodiment can be obtained by a simple configuration.

1‧‧‧Vacuum interrupter (pull-out type interrupter)

2‧‧‧Vacuum valve

3‧‧‧Molded frame

4‧‧‧Mechanical frame

5‧‧‧Trolley

5a‧‧‧ Wheels

6‧‧1 joint

7, 30‧‧‧ fixed frame

8, 32‧‧‧ floors

8a‧‧‧Snap hole

9, 31‧‧‧ fixed frame track

9a‧‧‧stops

10, 35‧‧‧ side panels

11‧‧‧Insulation support

12, 33‧‧‧ main circuit terminals

13‧‧‧ Guide protrusion (guide member)

14‧‧‧Roller (guide member)

15‧‧‧ convex

16, 19‧‧‧ guiding concave member (guide member)

17‧‧‧ Guide member convex member (guide member)

18‧‧‧ recess

20‧‧‧ Wheel guides (guide members)

34‧‧‧Insulating components

36‧‧‧Interlocking pin insertion hole

D‧‧‧ interval

Fig. 1 is a side view showing a state in which a pull-out type interrupter is placed on a fixing frame of the pull-out type interrupter according to the first embodiment of the present invention.

Fig. 2 (a) and (b) are top views showing a fixing frame of the pull-out type interrupter according to the first embodiment of the present invention.

Fig. 3 (a) and (b) are top views showing a fixing frame of the pull-out type interrupter according to the second embodiment of the present invention.

Fig. 4 is a top view showing a fixing frame of the pull-out type interrupter according to the third embodiment of the present invention.

Fig. 5 is a side view as seen from the arrow V-V of Fig. 4.

Fig. 6 is a plan view seen from arrow VI-VI of Fig. 5.

Fig. 7 is a top view showing another example of the fixing frame of the pull-out type interrupter according to the third embodiment of the present invention.

Fig. 8 (a) and (b) are top views showing another example of the fixing frame of the pull-out type interrupter according to the third embodiment of the present invention.

Fig. 9 (a) and (b) are top views showing a fixing frame of the pull-out type interrupter according to the fourth embodiment of the present invention.

Figure 10 is a perspective view showing the fixing frame of the conventional pull-out type interrupter view.

1‧‧‧Vacuum interrupter (pull-out type interrupter)

7‧‧‧Fixed frame

8‧‧‧floor

8a‧‧‧Snap hole

9‧‧‧Fixed frame track

9a‧‧‧stops

10‧‧‧ side panels

11‧‧‧Insulation support

12‧‧‧Main circuit terminal

13‧‧‧ Guide protrusion (guide member)

D‧‧‧ interval

Claims (6)

The fixing frame of the pull-out type interrupter is provided with: a floor, and a pair of fixed frame rails on the left and right sides for loading the pull-out type interrupter and guiding the movement in the front-rear direction; the main circuit terminal, and The upper and lower terminals are connected to be separated from the back side of the pull-out type interrupter; and a pair of side plates for insulatingly supporting the main circuit terminal; and the front floor is formed with the pull-out type interrupter connected to the foregoing a connecting hole of the main circuit terminal and an engaging hole provided in the interlocking pin of the pull-out type interrupter, and a guiding member is disposed to prevent the pull-out type interrupter from using the aforementioned interlocking pin The center is rotated by the electromagnetic force to rotate in the horizontal direction. The fixing frame of the pull-out type interrupter according to the first aspect of the invention, wherein the engaging hole is formed at a position eccentric from a center line of the left and right sides of the floor, and the guiding member is opposite to the foregoing The center line is disposed at a position opposite to the left and right of the aforementioned engaging hole. The fixing frame of the pull-out type interrupter according to claim 1 or 2, wherein the guiding member is in the pull-out type interrupter located at the connecting position with a small gap therebetween The guide protrusions provided on the upper surface side of the fixed frame rail are formed so that the side faces in the vicinity of the side corner portions face each other. The fixing frame of the pull-out type interrupter according to the first or second aspect of the invention, wherein the guiding member is a small gap and a rear side of the pull-out type interrupter located at the connecting position The side near the corner is opposite to the set, and can be turned in the moving direction of the pull-out type interrupter Moving wheel. The fixing frame of the pull-out type interrupter according to the first or second aspect of the invention, wherein the guiding member is a guiding concave member or a guiding convex member provided on the floor to be provided with The convex portion or the concave portion on the back side of the pull-out type interrupter is fitted. The fixing frame of the pull-out type interrupter according to claim 1 or 2, wherein the pull-out type interrupter has a wheel at a lower portion, and the guiding member is located at the aforementioned connecting position. The wheel guide of the aforementioned wheel fitting of the pull-out type breaker.