JPH0721987B2 - Vacuum switching circuit breaker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching breaker used to selectively connect two different power sources such as a regular power source and an emergency power source to a load side. It is characterized by having both a function and an abnormal current interruption function.

[0002]

2. Description of the Related Art For example, as a switching switch used to selectively connect two different power sources such as a regular power source and an emergency power source to a load side, for example, Japanese Patent Laid-Open No. 59-701.
The one described in the gazette of No. 08 is known. Such a conventional switching switch electrically and mechanically interlocks the opening and closing operations of the contacts connected to the first power source and the contacts connected to the second power source, and prevents contact between different power sources. However, since it does not have a short-circuit current interruption function, it must be used in combination with a circuit breaker or the like for short-circuit current interruption. Further, it is also possible to connect one circuit breaker for each power supply without using a switching switch and to provide an electric interlock for the switching operation of both power supplies to provide a power supply switching function and an abnormal current interrupting function. It is being appreciated. In this case, the danger of power source contact due to erroneous operation cannot be avoided, and when the opening / closing operation is the electric spring energy storage method, when the spring is energized and held by the closing latch in the closing standby state. Moreover, if the closing latch is released due to a mechanical trouble or the like, there is a risk of power source contact.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a compact circuit breaker for switching power supplies, which has two functions of interrupting a short circuit current and switching between different power supplies.

[0004]

According to the present invention, in order to solve the above-mentioned problems, a trolley on a carriage 2 which can be moved back and forth has a contact for opening and closing a first power source and a load circuit. A first vacuum valve 7 and a second vacuum valve 8 having a contact for opening and closing between the second power source and the load circuit are provided above and below, and inputs of the first and second vacuum valves 7 and 8 are provided. The terminals 9 and 10 and the interconnected common output terminal 11 are projected rearward, and the power source side terminals 4 and 6 connected to different power sources are provided at the rear positions away from the carriage 2 respectively.
The load side terminals 5 connected to the load are fixed so as to face the output terminals 11, and the terminals 4, 5, 6, which face each other by the forward and backward movement of the carriage 2, are fixed. 9, 10, 11 are connected and disconnectable, and the opening and closing operations of the first vacuum valve 7 and the second vacuum valve 8 are mechanically interlocked with each other. A vacuum switching circuit breaker was constructed by providing trip coils TC1 and TC2 for opening the contacts of the first or second vacuum valve.

[0005]

In the vacuum switching circuit breaker of the present invention, the trolley 2 is pushed backward to connect the input / output terminals 9 and 1011 to the power source side and the load side, and this is pulled forward to disconnect the circuit. The power supply is switched by alternately turning on and off the contacts of the first and second vacuum valves 7 and 8. Since the opening and closing operations of the first and second vacuum valves 7 and 8 are mechanically interlocked, the contacts of both valves 7 and 8 are not closed at the same time. The trip coil TC1 or TC2 is excited by a detection signal of an abnormal current such as a short-circuit current, and the contacts of the first or second vacuum valve 7, 8 in the closed state are opened.

[0006]

An embodiment of the present invention will be described with reference to the drawings.
1 is a vertical side view of the main part of the vacuum switching breaker, FIG. 2 is a front view of the vacuum switching breaker, FIG. 3 is a side view of the same, FIG. 4 is a plan view of the same, and FIG. 5 is a first view of the vacuum switching breaker. The side view of the power supply side operating mechanism, FIG. 6 is the side view of the second power supply side operating mechanism of the vacuum switching circuit breaker, and FIG. 7 is the explanatory view of the operating mechanism of the vacuum switching circuit breaker.
FIG. 8 is an operation explanatory view of the operation spring energy storage mechanism of the vacuum switching circuit breaker, FIG. 9 is the same operation explanatory drawing, FIG. 10 is the same operation explanatory drawing, FIG. 11 is the same operation explanatory drawing, and FIG. 12 is the same operation explanatory drawing. is there.

As shown in FIGS. 1 to 4, the main body 1 of the switching breaker is provided on a carriage 2 and is movable back and forth on a base 3. The base 3 is fixed to a switchboard, and the standing frame 3a has a first power supply side terminal 4 connected to a first power supply such as a regular power supply at the uppermost part and a load side terminal connected to a load circuit below the first power supply side terminal 4. 5, and a second power source side terminal 6 connected to a second power source such as a standby power source is fixed to the lowermost portion. At the rear part of the switching breaker main body 1, two sets of vacuum valves 7, 8 are provided up and down. First
The vacuum valve 7 has a contact inside for opening and closing between the first power source and the load circuit, and the second vacuum valve 8 is
It internally has a contact for opening and closing between the second power supply and the load circuit. The input terminal 9 on the upper side of the first vacuum valve 7 and the input terminal 10 on the lower side of the second vacuum valve 8 project rearward and face each other so that they can contact the first and second power supply side terminals 4 and 6, respectively. is doing. The output terminal 11 on the lower side of the vacuum valve 7 is connected to the output terminal 12 on the upper side of the vacuum valve 8 by a conductor 13, projects rearward, and opposes so as to be able to contact the load side terminal 5. The vacuum valve 7,
8 are horizontally arranged in line corresponding to each phase of the power supply, and the terminals 4, 5, 6, 9, 10, 11, 12 are also horizontally arranged in line 3 corresponding to this. ing.

As shown in FIG. 1, the contact point of the first vacuum valve 7 is turned on by pushing up the movable portion 14 extending downward, and is normally urged by the normally open spring 15 to open. There is. The contact point of the second vacuum valve 8 is turned on by pushing down the movable portion 16 extending upward, and is normally urged by the normally open spring 17 to open. As shown in FIGS. 1, 5, and 6, two main shafts 18 and 19 are horizontally rotatably pierced horizontally in the main body 1, and three shafts are respectively provided corresponding to each phase of the power source. The levers 20 and 21 are fixed at the central portion thereof.
The movable parts 14, 16 of the vacuum valves 7, 8 are pivotally attached to one ends of the first and second shaft levers 20, 21 via insulating rods 14a, 16a, respectively. Therefore, the contacts of the vacuum valves 7 and 8 are opened and closed by the forward and reverse rotations of the shaft levers 20 and 21. As shown in FIGS. 1 and 5, the other end of the first shaft lever 20 is pivotally attached to one end of the first link mechanism 22 via a connecting rod 28. The first link mechanism 22 includes first to fifth links 23, 24, 2
5, 26, 27. The lower end of the first link 23 is pivotally attached to the other end of the shaft lever 20 via a connecting rod 28, and the upper end thereof is pivotally attached to one apex of the second link 24 having a substantially triangular shape. As shown in FIG. 5, the second link 24
Is pivotally attached to the mechanical frame 81 of the main body 1 by the pin 29 at the middle top and the third link 2 at the other top.
5 is pivotally attached to one end. The other end of the third link 25 is pivotally attached to one end of the fourth link 26, and is provided with a roller 30 there. The other end of the fourth link 26 is pivotally attached to one end of the fifth link 27, and is provided with a roller 31 there. The fourth link 26 is provided with a stopper 81 protruding from the mechanism frame 1.
The clockwise rotation is restricted at a. 5th link 2
The other end of 7 is pivotally attached to the mechanism frame 81 by a pin 32. The fifth link 27 is constantly urged to rotate counterclockwise by the spring 33, and is prevented from rotating by a stopper pin 81b fixed to the mechanism frame 81. First
The support latch 35 has a substantially L shape, is pivotally attached to the mechanism frame 81 by a pin 36 at the bending portion, and is constantly urged to rotate counterclockwise by a spring 40. Support latch 35
Is a support piece 35 that pushes up and supports the roller 31 at one end.
a and an operation piece 35b extending from the other end thereof at a substantially right angle
Have and. The operation piece 35b is provided with a pin 35c,
This is movably inserted into the long hole 81c of the mechanism frame 81, and therefore is prevented from rotating at the end of the long hole 81c. The lower edge of the lever 37 is provided so as to engage with the support latch 35 via the pin 35c and integrally rotate only in the clockwise direction. The first trip coil TC1 is fixed to the mechanism frame 81, and when it is excited, its iron core protrudes upward to push up the operation piece 35b, rotate the support latch 35 in the clockwise direction, and rotate the support piece. Three
The support of the roller 31 by 5a is removed.
The first closing cam 38 uses the shaft 39 to move the mechanism frame 81.
Is supported so as to rotate counterclockwise, and the roller 30 is pushed down during the rotation. Then, when the roller 31 is in the position pushed up by the support latch 35, the links 25 and 26 form a toggle joint mechanism, and the dead occurs while the roller 30 is pushed down by the closing cam 38 until it abuts on the stopper 81a. After passing the point, the links 25, 26 are prevented from being reversed, that is, the counterclockwise rotation of the second link 24 is prevented.

As shown in FIGS. 1 and 6, the other end of the second shaft lever 21 is pivotally attached to one end of the second link mechanism 42 via a connecting rod 48. Second link mechanism 4
2 is the second to fifth links 43, 44, 45, 4
It consists of 6,47. The upper end of the first link 43 has a connecting rod 4
8 is pivotally attached to the other end of the shaft lever 21 and the lower end thereof is pivotally attached to one apex of the second link 44 having a substantially triangular shape. As shown in FIG. 6, the second link 44 has the mechanism frame 8 of the main body 1 by the pin 49 at the middle top.
2 and is pivotally attached to one end of the third link 45 at the other top. The other end of the third link 45 is pivotally attached to one end of the fourth link 46 and is provided with a roller 50. The other end of the fourth link 46 is pivotally attached to one end of the fifth link 47, and the roller 51 is provided here. 4th link 4
6, a stopper 82a protruding from the mechanism frame 82 limits rotation in the counterclockwise direction. Fifth link 47
The other end of is attached to the mechanism frame 82 by a pin 52. The fifth link 47 is constantly urged to rotate clockwise by the spring 53, and is prevented from rotating by a stopper pin 82b fixed to the mechanism frame 82. The second support latch 55 is substantially L-shaped, and is pivotally attached to the mechanism frame 82 by the pin 56 at the bending portion, and is constantly urged to rotate clockwise by the spring 41. The support latch 55 includes a support piece 55a that pushes up and supports the roller 51 at one end,
And an operating piece 55b extending from the other end thereof at a substantially right angle. A pin 55c is projectingly provided on the operation piece 55b, and the pin 55c is movably inserted into the elongated hole 82c of the mechanism frame 82. Therefore, the pin 55c is prevented from rotating at the end of the elongated hole 82c. The lower edge of the lever 57 is provided so as to engage with the support latch 55 via the pin 55c and integrally rotate only in the counterclockwise direction. The second trip coil TC2 is fixed to the mechanism frame 82, and when it is excited, its iron core projects downward to push down the operation piece 55b,
Rotate the support latch 55 counterclockwise to
The support of the roller 51 by a is removed. The second closing cam 58 is supported by the mechanism frame 82 by the shaft 59 so as to rotate in the clockwise direction, and pushes down the roller 50 during the rotation. Then, when the roller 51 is in the position pushed down by the support latch 55 (FIG. 11), the links 45 and 46 form a toggle joint mechanism, and the roller 50 is pushed down until it comes into contact with the stopper 82a by the closing cam 58. While passing through the dead point, the links 45 and 46 are prevented from being reversed, that is, the second link 44 is prevented from rotating counterclockwise.

Next, the interlock mechanism will be described.
As shown in FIGS. 1, 5, and 6, the first support latch 35
And the connecting rod 28 are connected to each other via a lever 37 and an interlock link mechanism 60. Also, the second
Between the support latch 55 and the connecting rod 28 of the lever 57,
They are connected to each other via an interlock link mechanism 60. That is, the interlock link mechanism 60 and the first and second connecting levers 61 and 62 (which overlap with each other in FIGS. 1, 5 and 6) and the first and second interlock rods 63 and 6 are included.
4 and. The connecting lever 61 is pivotally attached to the main body 1 by a shaft 65, one end of which is attached to the lower end of the connecting rod 28, and the other end thereof is attached to the upper end of the first interlocking rod 63. The lower end of the first interlock rod 63 is pivotally attached to one end of the lever 57. The connecting lever 62 is also pivotally attached to the main body 1 by a shaft 65, one end of which is attached to the upper end of the connecting rod 48 and the other end of which is attached to the lower end of the second interlocking rod 64. The upper end of the second interlock rod 64 is pivotally attached to one end of the lever 37.

Next, the rotating mechanism of the first and second closing cams 38 and 58 will be described. Since the first and second closing cams 38 and 58 and the rotating mechanism thereof are of the same configuration and are provided upside down.
And only the rotating mechanism thereof will be described, and a detailed description of the second closing cam 58 will be omitted. As shown in FIG. 7, the ratchet gear 6 is provided on the shaft 39 of the closing cam 38.
6, the energy storage cam 67 is fixed, and the energy storage lever 6
8. A reverse rotation preventing lever 69 is pivotally attached. Lever 6
8 is provided so as to surround the ratchet gear 66,
It is biased by a return spring 70 so as to return to a fixed position, and a ratchet pawl 71 that meshes with the ratchet gear 66 is attached to the inside thereof. Then, when the cam 72 is rotated by the motor M, the lever 68 is reciprocally rotated, and the teeth of the ratchet gear 66 are sent one by one by the pawl 71 for each reciprocation to rotate the shaft 39 clockwise. ing. The reverse rotation prevention lever 69 is provided with a stopper 73.
Counterclockwise rotation is prevented by abutting against the., And a reverse rotation preventing ratchet pawl 74 meshing with the ratchet gear 66 is provided. Therefore, the reverse rotation preventing lever 69 prevents the shaft 39 from rotating counterclockwise through the ratchet pawl 74 and the ratchet gear 66. The energy storage cam 67 has a notch 67a on the outer circumference, and one end of a spring 75 is locked at the eccentric position. A closing latch 76 is pivotally attached to a position near the energy storage cam 67, and by engaging the notch 67a of the energy storage cam 67, the rotation of the temporary shaft 39 in the clockwise direction is stopped. There is. When receiving the closing command, the closing coil CC projects the iron core to rotate the closing latch 76, and the engagement between the closing latch 76 and the energy storage cam 67 is released to release the shaft 39. Then, when the motor M rotates a predetermined number from the position of the closing cam 38 shown by the phantom line in FIG.
It rotates 0 degrees, and the closing cam 38 comes to the closing standby position shown by the solid line. During this time, the spring 75 is compressed and stored by the energy storage cam 67. When the compression dead point is slightly exceeded, the closing latch 76 engages with the notch 67a to prevent the shaft 39 from rotating. When the shaft 39 is released by the closing coil CC, the closing cam 38 instantly rotates counterclockwise by approximately 180 degrees, and the roller 30 is pushed down during the closing operation to perform the closing operation. The motor M is controlled to start rotating immediately after the shaft 39 is released by the closing command and immediately place the cam 38 in the closing standby position. In addition, the shaft 39 can be manually rotated and placed in a stored state.

Next, the operation of the switching breaker of this embodiment will be described. Now, as shown in FIG. 8, the first vacuum valve 7
It is assumed that the first power source is closed and the first power source is connected to the load. At this time, the lever 57 and the support latch 55 are pulled up by the interlock rod 63 and are in the pull-out position, and the roller 51 loses the support.
5, 46 and 47 do not form a toggle joint, and therefore, even if the closing latch 76 (FIG. 7) on the shaft 59 side is disengaged for some reason and the closing cam 58 rotates, the second power supply side is not turned on. Absent. From this state, trip coil TC1
Receives a short-circuit current detection signal on the load side or receives a first power supply cutoff command, the instantaneous iron core projects and the support latch 35 rotates clockwise as shown in FIG. The movable portion 14 is pushed down by 15 to open the contact of the vacuum valve 7, and the shutoff operation of the first power source is completed as shown in FIG. During this time, the shaft lever 20 rotates clockwise, and the connecting rod 28 and the connecting lever 6
1, the support latch 55 rotates clockwise through the interlock rod 63 and the lever 57, and comes into contact with the roller 51 to support the roller 51. Then, the link 27 has the spring 3
3, the support latch 35 is rotated counterclockwise by the spring 40, and the support latch 35 is rotated counterclockwise by the spring 40 as the iron core of the trip coil TC1 is retracted. (Figure 10). Next, when the second power-on command is given, the iron core of the closing coil CC projects to rotate the closing latch 76, which releases the energy storage cam 67 (FIG. 7) and, as shown in FIG. 11, the shaft 59.
At the same time, the closing cam 58 instantly rotates by approximately 180 °, and during this time the roller 50 is pushed up, the links 45, 46, 47 are stretched beyond the dead point, and the links 44, 43,
Through the connecting rod 48, the shaft lever 21 rotates clockwise to close the contact of the vacuum valve 8 and supply the second power source to the load side. During this time, the connecting lever 62 is rotated counterclockwise, and the support latch 35 is rotated clockwise through the interlock rod 64 and the lever 37 to be placed in the pull-out position. In this state, since the roller 31 has lost its support,
The links 25, 26, 27 do not form a toggle joint, and therefore the closing latch 76 on the shaft 39 side is caused by some reason.
Even if (Fig. 7) is disengaged and the closing cam 38 is rotated, the first power supply side is not turned on. The released shaft 59 and the closing cam 58 rotate clockwise by about 180 ° and instantly.
The operation of turning on the second power source is completed while the state of 1 is reached.
Immediately thereafter, the motor M is rotated to store the spring 75 (FIG. 7), and the shaft 59 and the closing cam 58 are moved in the clockwise direction by about 1 mm.
It is rotated by 80 °, brought to the closing standby position shown in FIG. 12, and prepared for the next closing operation. Similarly, the turning-on operation on the first power supply side is performed.

[0013]

As described above, according to the present invention, the first vacuum valve 7 having the contacts for opening and closing the first power source and the load circuit is provided on the carriage 2 which is movable back and forth. ,
A second vacuum valve 8 having a contact for opening and closing a second power source and a load circuit is provided above and below, and input terminals 9 and 10 of the first and second vacuum valves 7 and 8 and interconnections. The common output terminal 11 is projected rearward, and the power source side terminals 4 and 6 connected to different power sources are vertically arranged side by side so as to face the respective input terminals 9 and 10 at a rear position apart from the carriage 2. And the load side terminal 5 that is connected to the load
Are fixed so as to face the output terminals 11, and the terminals 4, 5, 6, 9, 1 facing each other due to the forward and backward movement of the carriage 2 are opposed to each other.
0 and 11 are connectable and disconnectable, and the opening and closing operations of the first vacuum valve 7 and the second vacuum valve 8 are mechanically interlocked with each other, and the first or the first is detected by the abnormal current detection signal on the load side. Since the trip coils TC1 and TC2 for opening the contacts of the two vacuum valves are provided, it is possible to provide a compact power source switching circuit breaker having two functions of blocking short-circuit current and switching between different power sources. Has the effect.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a main part of a vacuum switching circuit breaker.

FIG. 2 is a front view of a vacuum switching circuit breaker.

FIG. 3 is a side view of a vacuum switching circuit breaker.

FIG. 4 is a plan view of a vacuum switching circuit breaker.

FIG. 5 is a front view of a first power supply side operation mechanism of the vacuum switching circuit breaker.

FIG. 6 is a front view of a second power supply side operation mechanism of the vacuum switching circuit breaker.

FIG. 7 is an explanatory diagram of an operating mechanism of the vacuum switching circuit breaker.

FIG. 8 is an operation explanatory view of the operating mechanism of the vacuum switching breaker.

FIG. 9 is an operation explanatory view of the operating mechanism of the vacuum switching circuit breaker.

FIG. 10 is an operation explanatory view of the operating mechanism of the vacuum switching circuit breaker.

FIG. 11 is an operation explanatory view of the operating mechanism of the vacuum switching circuit breaker.

FIG. 12 is an operation explanatory view of the operating mechanism of the vacuum switching circuit breaker.

[Explanation of symbols] 1 main body 2 dolly 4 power supply side terminal 6 power supply side terminal 7 vacuum valve 8 vacuum valve 9 input terminal 10 input terminal 60 interlock mechanism TC1 trip coil TC2 trip coil

Claims (4)

[Claims] 1. A first vacuum valve having a contact for opening and closing a first power supply and a load circuit, and a second power supply and a load circuit on a carriage that is movable back and forth. A second vacuum valve having a contact for opening and closing is provided above and below,
The input terminals of the first and second vacuum valves and the interconnected common output terminals are projected rearward, and power source side terminals connected to different power sources are provided at rearward positions away from the carriage, respectively. The load side terminals connected to the load are fixed so as to face the output terminals, and the terminals facing each other are connected and disconnected by the forward and backward movement of the carriage. And a trip coil that mechanically interlocks the opening and closing operations of the first vacuum valve and the second vacuum valve and opens the contact point of the first or second vacuum valve by a detection signal of an abnormal current on the load side. A vacuum switching circuit breaker characterized by being provided with. 2. A first vacuum valve having a contact for opening and closing between a first power supply and a load circuit, and a second vacuum valve having a contact for opening and closing between a second power supply and a load circuit. And the vacuum valves of the first and second vacuum valves, which are always urged in the direction to open the contacts, are respectively attached to one ends of the first and second shaft levers pivotally attached to the mechanism frame. The first and second shaft levers are pivotally attached, and the other ends of the first and second shaft levers are pivotally attached to one ends of the first and second link mechanisms, respectively.
And a first closing cam, which is located in the vicinity of the link mechanism and presses a part of the link mechanism by the cam surface during rotation to cause the shaft lever to perform the contact closing operation. A first part for abutting and supporting the other part of the link mechanism at the supporting position to maintain the closed state of the contact and disengaging the support of the link mechanism at the tripping position for causing the shaft lever to perform the contact breaking operation. , And second support latches are provided respectively, and when a cutoff command or a trip command is received in the vicinity of the first and second support latches,
First and second trip coils for placing the second support latch in the trip position are provided, and the first support latch and the second trip coil are provided.
The shaft lever and the second support latch and the first shaft lever are connected by an interlocking link mechanism, respectively, and the first contact is made when the contact of the first vacuum valve is in the closed state. The first support latch in the support position and the second support latch in the disengaged position,
The vacuum switching circuit breaker is characterized in that the second support latch is placed in the support position and the first support latch is placed in the pull-out position when the contact of the vacuum valve is off. 3. A first vacuum valve having a contact for opening / closing between a first power supply and a load circuit, and a second vacuum valve having a contact for opening / closing between a second power supply and a load circuit. And the vacuum valves of the first and second vacuum valves, which are always urged in the direction to open the contacts, are pivotally attached to one ends of the first and second shaft levers, respectively. , The other end of the second shaft lever is pivotally attached to one end of each of the first and second link mechanisms, and each of the first and second link mechanisms is provided with a toggle joint portion, and in the vicinity of the toggle joint portion. , The first and second closing cams for pressing the center joint of the toggle joint portion by the cam surface during rotation to cause the shaft lever to perform the closing operation of the contact, and the supporting position. Abutting and supporting the other joint of the toggle joint First and second support latches are provided respectively for maintaining the contact closed state and removing the support of the link mechanism at the disengagement position to cause the shaft lever to perform the contact breaking operation. First and second positioning of the first and second support latches in the trip position at a position near the support latch when a cutoff command or a trip command is received
A trip coil is provided, and the first support latch and the second shaft lever are connected to each other and the second support latch and the first shaft lever are connected to each other by an interlock link mechanism. Placing the first support latch in the support position and the second support latch in the disengaged position when the contacts of the first vacuum valve are in the closed position;
A vacuum switching circuit breaker, characterized in that when the contact of the first vacuum valve is in the shut-off state, the second support latch is placed in the support position and the first support latch is placed in the pull-out position. 4. The first and second closing cams are respectively connected to biasing springs, which are locked by a closing latch in a state where the biasing springs are stored and are in a closing standby state. 4. The receiving latch is configured to be disengaged to rotate instantly when the receiving latch is received.
Vacuum switching circuit breaker described in.