JPH11146514A - Vacuum circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the breadth and to obtain stable operation and stabilized contact pressure. SOLUTION: Along with putting end vacuum valves 36 at positions right and left on a line crossing the advancing direction of a truck 35 at right angles keeping an insulation distance, a central vacuum valve 37 is put at a position in front or at the rear of the center position of both end vacuum valves 36 keeping an insulation distance with respect to both the end vacuum valves 36. Then after causing led-out conductors 16, 18 from both the end vacuum valves 36 to bulge out laterally respectively, they are extended backwards, with an insulation distance kept between the led-out conductors 16, 18. Both end and central shafts 42, 43 are interlocked by providing the central shaft 43 which moves the movable electrode 13 of the central vacuum valve 37 via the drive lever 27, in parallel to the end shafts 42 in the right and left directions which move the movable electrodes 13 of both the end vacuum valves 36 via the drive levers 27, and linking the end levers 45 fixed to the end shafts 42 to a central lever 46 fixed to the central shaft 43 by the use of a linking lever 47.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum circuit breaker used for an aerial switchgear or the like.

[0002]

2. Description of the Related Art First, a conventional gas circuit breaker will be described with reference to FIGS. In these figures, 1 is a three-phase fixed contact having a cut-off portion located at the position of a vertex of a triangle, 2 is a horizontal three-phase connecting plate having a Y-shaped plane, and 3 is an underside of the connecting plate 2 at the upper end. The drive shaft 4 is fixed to the center of the connecting plate 4, and the base 3 is a three-phase movable contact vertically mounted on the upper surface of each piece of the connecting plate 2;
A guide hole formed at the tip of each piece of
Is a link connected to the drive shaft 3, and the guide rod 6 is rotated by the rotation of the link 7.
The connecting plate 2 moves up and down along with each other, and each movable contact 4 comes into contact with and separates from each fixed contact 1.

As shown in FIG. 4, even when the fitting between the guide rod 6 and the guide hole 5 is loose and the connecting plate 2 is slightly inclined, the movable contact 4 can sufficiently contact the fixed contact 1. Since the length of the movable contact 4 is ensured, there is no problem in energization.

(Vacuum Circuit Breaker) In contrast to the gas circuit breaker, a conventional vacuum circuit breaker has a configuration shown in FIGS. In these figures, 8 is a wide carriage, 9 is a carriage 8
The wheels 10 are three-phase vertical vacuum valves, and are arranged at the same height position on the rear of the bogie 8 and at equal intervals in the left-right direction while securing an insulation distance. Reference numeral 11 denotes a flat fixed electrode supported by a fixed support rod 12 on the upper portion of the vacuum valve 10, 13 denotes a flat movable electrode supported by a movable support rod 14, and 15 denotes a movable support rod 14 at a lower end of the vacuum valve 10. And a movable support rod 1
4 is led downward from the vacuum valve 10.

Reference numeral 16 denotes a fixed-side lead-out conductor, which is connected to the fixed support rod 12 and is drawn out rearward. A fixed-side contact 17 is provided at the tip. Reference numeral 18 denotes a movable side lead-out conductor,
The front end is supported by the support plate 19, the front end is connected to the lead-out portion 21 of the movable support rod 14 via the flexible lead wire 20, and the movable end contact 22 is provided at the rear end. An insulation distance is secured between the two lead conductors 16 and 18 located below.

Reference numerals 23 and 24 denote circular receiving plates which are fixed to the leading end of the lead-out portion 21 of the movable support rod 14 in the middle. 2
Reference numeral 5 denotes a circular movable plate, which is movably provided in the lead-out portion 21 between the receiving plates 23 and 24. 26 is the middle receiving plate 2
A spring provided between the movable plate 4 and the movable plate 25, a driving lever 27, a spherical bulging portion at the tip is located between the movable plate 25 and the receiving plate 23 at the tip, and a guide hole of the bulging portion. The lead-out part 21 is inserted through 28.

Reference numeral 29 denotes a cover plate made of an insulating material and provided upright on a rear portion of the carriage 8 and covers the three vacuum valves 10 at a time. Reference numeral 30 denotes a partition plate made of two insulators in the cover plate 29, and is located in the middle of the adjacent vacuum valve 10.

Reference numeral 31 denotes an operation device installed at the front of the carriage 8, and 32 denotes a left-right main shaft, which is rotatably provided at the rear of the carriage 8. Reference numeral 33 denotes a support for each phase fixed to the main shaft 32, and the drive lever 27 is fixed to the support 33. Reference numeral 34 denotes a connection lever having a base fixed to the main shaft 32, and is rotated by an operation mechanism of the operation device 31.

When the connecting lever 34 is turned, the main shaft 32 is turned, and the drive lever 27 is turned via the support 33, so that the movable plate 25, the spring 26, the middle receiving plate 24, and the lead-out portion The movable support rod 14 moves to the fixed electrode 11 side via 21, and the movable electrode 13 contacts the fixed electrode 11 as shown in FIG.

Next, when the connecting lever 34 is rotated in the reverse direction from the state shown in FIG. 5, the main shaft 32 and the driving lever 27 are rotated in the direction opposite to the above-mentioned closing state, and are moved through the receiving plate 23 and the lead-out portion 21 at the distal end. As a result, the movable support rod 14 moves in the opposite direction, the movable electrode 13 is separated from the fixed electrode 11, and the movable electrode 13 enters a cutoff state.

[0011]

In the conventional vacuum circuit breaker, since the three-phase vacuum valves 10 are juxtaposed in the left-right direction, as shown in FIG.
Assuming that the insulation distance therebetween is A, and the distance from the center of the vacuum valve 10 at the end to the side end of the circuit breaker, that is, the side edge of the bogie 8 is B, the width D of the circuit breaker is (2A + 2B). Therefore, there is a problem that the width dimension is large.

On the other hand, when the vacuum circuit breaker is to be disposed at the apex of a triangle like the gas circuit breaker shown in FIG. 3, in the vacuum valve, the flat movable electrode is connected to the flat fixed electrode by the external pressure welding. Since the pressure is applied by the pressing force of the spring to obtain the current-carrying ability, the compression allowance of the external pressing spring directly determines the pressing force of both electrodes. Therefore, even if a slight inclination occurs in the three-phase connecting plate 2 in FIG. It should be noted that even if the three-phase connecting plate 2 is
The three-phase connecting plate 2 is tilted due to the imbalance of the loads of the external press-contact springs, and the guide portion of the three-phase connecting plate 2, that is, the guide rod 6 and the guide hole 5 are twisted, which hinders the drive mechanism. However, there is a problem that stable operation and contact pressure cannot be obtained.

In view of the above, the present invention provides a vacuum circuit breaker which secures an insulation distance to reduce a width dimension and does not hinder a driving mechanism, and can obtain a stable operation and a contact pressure. The purpose is to:

[0014]

In order to solve the above problems, a vacuum circuit breaker according to the present invention comprises an end vacuum valve having an insulation distance at left and right positions on a line perpendicular to the traveling direction of a bogie. The central vacuum valve is located at a position before or after the intermediate position of the vacuum valves at both ends while maintaining an insulation distance with respect to the vacuum valves at both ends, and the conductors derived from the vacuum valves at the both ends are located on the respective sides. After extending toward the rear, it extends rearward to maintain an insulation distance between the respective lead-out conductors, and the central vacuum is attached to the left and right end shafts for moving the movable electrodes of the vacuum valves at both ends via a drive lever. A central axis for moving the movable electrode of the valve via a driving lever is provided in parallel, and an end lever fixed to the end axis and a central lever fixed to the central axis are connected by a connecting rod, and the two Link axes It is obtained by way.

Accordingly, the end vacuum valves are positioned at left and right positions on a line perpendicular to the traveling direction of the bogie while maintaining an insulation distance, and the end vacuum valves are positioned before or after the intermediate position of the vacuum valves at both ends. Position the central vacuum valve while keeping the insulation distance from the vacuum valve, extend the conductors from the vacuum valves at both ends to the sides, and then extend backward to maintain the insulation distance between the conductors. As a result, the insulation distance between the vacuum valves and between the lead-out conductors can be ensured, and the vacuum valves are arranged at the positions of the vertices of the triangle, so that the width of the vacuum circuit breaker can be reduced.

In addition, a central axis for moving the movable electrode of the central vacuum valve via the drive lever is provided in parallel with an end shaft in the left and right direction for moving the movable electrode of the vacuum valve on both ends via the drive lever. Since the end lever fixed to the main shaft and the central lever fixed to the central shaft are connected by a connecting rod so that both shafts work together, each movable electrode does not tilt and does not interfere with the drive mechanism. , Stable operation and contact pressure can be obtained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIG. 1 (right side) and FIG. 2 (plane). In these figures, the same reference numerals as those in FIGS. 5 and 6 indicate the same or corresponding elements, and the differences are as follows.

Reference numeral 35 denotes a bogie having a reduced width.
The operation device 31 is fixed to a front portion of the carriage 35. 36
Are two end vacuum valves, which are located at left and right positions on a line orthogonal to the traveling direction of the carriage 35 with an insulation distance therebetween. Reference numeral 37 denotes a central vacuum valve, and a vacuum valve 36 at both ends is provided at a position after the intermediate position of the vacuum valves 36 at both ends.
The vacuum valves 36 and 37 are arranged at the apexes of a triangle as shown in FIG.

Then, the fixed-side lead-out conductor 16 and the movable-side lead-out conductor 18 from both ends of the vacuum valve 36 bulge out to the side, respectively, and then extend rearward to separate the two lead-out conductors 16, 18 from the central vacuum valve 37. Lead to the rear, each lead conductor 1
An insulation distance is maintained between 6,18.

Numeral 38 designates a cover plate made of an insulating material which stands on the carriage 35. The three vacuum valves 3 at both ends and the center are provided.
6, 37 are collectively covered. 39 is 2 in the cover plate 38
This is a partition plate made of a piece of insulating material.
6 is located inside.

Reference numeral 40 denotes a current transformer, and each fixed-side lead-out conductor 1
6. Reference numeral 41 denotes a support bar protruding from an upper portion of the peripheral surface of the cover plate 38, and the current transformer 40 is supported by the support bar 41.

Reference numeral 42 denotes a long left-right end shaft, which is provided below and in front of the end vacuum valve 36. 43
Is a short central axis in the left-right direction. The central axis is provided substantially behind and parallel to the end shaft 42, and the support 33 is fixed to both ends of the end shaft 42 and the central shaft 43. .

Reference numeral 44 denotes a connecting lever fixed to the center of the end shaft 42, which is rotated by the operating mechanism of the operating device 31. 45 is an end lever, the upper end of which is connected lever 44
And is integrally fixed to the base portion. 46 is a central lever whose upper end is fixed to the support 33 of the central shaft 43, 47 is a connecting rod, which connects the end lever 45 and the lower end of the central lever 46.

When the connecting lever 44 is turned, the end shaft 42 is turned, and at the same time, the center shaft 43 is turned via the end lever 45, the connecting rod 47 and the center lever 46, and the support 33 is moved. The drive lever 27 rotates through the movable plate 2
5, the movable support rod 14 moves to the fixed electrode 11 side via the spring 26, the middle receiving plate 24, and the lead-out portion 21, and the movable electrode 13
Comes into contact with the fixed electrode 12 and enters a closed state.

Next, when the connecting lever 44 is rotated in the reverse direction from the state shown in FIG. 1, the end shaft 42 and the central shaft 43 are rotated in the direction opposite to the direction of the closing operation, and are movable via the receiving plate 23 at the distal end. The support rod 14 moves in the opposite direction, and the movable electrode 13
, And enters the cutoff state.

(Example) Next, an example will be described. As shown in FIG. 1, the length of each drive lever 27 and the length of the end lever 45 and the center lever 46 are made equal to each other.
As shown in (1), the central vacuum valve 37 and the end vacuum valve 36 are arranged at the vertices of a right-angled isosceles triangle, that is, at the vertices of a right-angled isosceles triangle, respectively.

In this case, the distance from the center of the vacuum valve 36 at both ends to the middle position of the vacuum valve 36 at both ends is C, and the center of the vacuum valve 36 at both ends and the central vacuum valve 37
Assuming that the distance to the center of A is the insulation distance A, C = A / √2
Becomes Therefore, if the distance from the center of the end vacuum valve 36 to the side end of the circuit breaker, that is, the side edge of the bogie 35 is B,
The width D ′ of the circuit breaker is (2C + 2B = √2A + 2B), and the size of (2-√2) A is reduced as compared with the conventional width D.

When the end shaft 42 and the center shaft 43 are rotated, the length of each drive lever 27 is equal,
5 and the length of the central lever 46 are equal, the spring 26 of the drive mechanism of each vacuum valve 36, 37 retains the same compression allowance at any point in time, while maintaining the same compression allowance.
Can be operated.

[0029]

Since the present invention is configured as described above, it has the following effects. The vacuum circuit breaker according to the present invention has a left,
The end vacuum valve 36 is located at the right position with an insulation distance therebetween, and the central vacuum valve 37 is located at a position before or after the intermediate position between the both end vacuum valves 36 while maintaining the insulation distance with respect to the both end vacuum valves 36. And the lead-out conductors 16 and 18 from the vacuum valves 36 at both ends are bulged to the side and then extended rearward, so that the insulation distance between the lead-out conductors 16 and 18 is maintained. 36,
Insulation distances between the 37 and the lead-out conductors 16 and 18 can be ensured, and the vacuum valves 36 and 37 are arranged at the vertices of the triangle, so that the width of the vacuum circuit breaker can be reduced.

In addition, the movable electrode 1 of the end vacuum valve 36
3 is moved to the end shaft 42 through the drive lever 27,
A central shaft 43 for moving the movable electrode 13 of the central vacuum valve 37 via the drive lever 27 is provided in parallel with an end shaft 42.
The end lever 45 fixed to the central shaft 43 and the central lever 46 fixed to the central shaft 43 are connected by a connecting
Since the movable electrodes 2 and 43 are interlocked, the movable electrodes 13 do not tilt and do not hinder the drive mechanism, and a stable operation and contact pressure can be obtained.

[Brief description of the drawings]

FIG. 1 is a cutaway right side view of one embodiment of the present invention.

FIG. 2 is a cut-away plan view of FIG.

FIG. 3 is a perspective view of a shut-off unit of a conventional gas circuit breaker.

FIG. 4 is a partial front view of another state of FIG. 3;

FIG. 5 is a cut-away right side view of a conventional vacuum circuit breaker.

FIG. 6 is a sectional plan view of FIG. 5;

[Explanation of symbols]

 Reference Signs List 11 fixed electrode 13 movable electrode 16 lead conductor 17 contact 18 lead conductor 22 contact 27 drive lever 35 bogie 36 end vacuum valve 37 center vacuum valve 42 end shaft 43 center shaft 45 end lever 46 center lever 47 connecting rod

Claims (1)

[Claims] 1. A three-phase vertical vacuum valve provided at the same height position on a trolley, a flat movable electrode which comes in contact with and separates from a flat fixed electrode in each of the vacuum valves, and In a vacuum circuit breaker having a contact led out by a lead-out conductor to the rear, while positioning an end vacuum valve while maintaining an insulation distance at left and right positions on a line orthogonal to the traveling direction of the bogie,
A central vacuum valve is located at a position before or after an intermediate position of the both ends vacuum valve while maintaining an insulation distance from the both ends vacuum valve, and the lead-out conductors from the both ends vacuum valve are expanded laterally, respectively. After being extended, it extends rearward to keep the insulation distance between the respective lead-out conductors, and the movable electrode of the vacuum valve at both ends is moved to the left and right end shafts via a drive lever. A central axis for moving the electrode via a drive lever is provided in parallel, and an end lever fixed to the end axis and a central lever fixed to the central axis are connected by a connecting rod to interlock the two axes. A vacuum circuit breaker characterized by performing.