JP2001160341A - Vacuum breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify constitution and reduce force to drive operation mechanism by eliminating a time lag to drive a plurality of vacuum valves at a high speed and by removing a wipe spring to secure contact pressure in the state of the main contact being kept on. SOLUTION: Two vacuum valves 1, 7 are disposed by facing respective moving shafts 2, 8 so that both center shafts form a straight line, connecting the both moving shafts 2, 8 via a magnetic body 6, around which a magnet 5 is disposed so that it magnetically works on the magnetic body 6 to drive the both moving shafts 2, 8 in one direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum interrupting method in which a high-frequency current is superimposed on a current to be interrupted, a current zero is forcibly formed in a combined current of the two currents, and the vacuum valve is interrupted at the current zero. About the vessel.

[0002]

2. Description of the Related Art In order to cut off a fault current when a short circuit fault occurs in a DC feeder circuit of an electric railway, an arc in the air is extended to increase an arc voltage to a level higher than a power supply voltage, thereby limiting the fault current. The breaking method has been adopted for a long time, and even today, a large number of aerial arc circuit breakers are used in DC feeding circuits. However, a breaker for a feeding circuit of an aerial arc type has a large arc chute for extending an arc, and generates a large arc-extinguishing sound when current is interrupted. Moreover, since the arc is extinguished by increasing the arc voltage, the contact is greatly consumed, and the cost required for maintenance of the circuit breaker is large.

[0003] In recent years, with the progress of power semiconductor devices, there have been cases where semiconductor breakers using thyristors and GTO devices are used in DC feeding circuits. Semiconductor devices such as thyristors and GTOs will be damaged if exposed to currents and voltages exceeding the device rated currents.In addition, these power semiconductor devices themselves are extremely expensive, so that the number of devices used is limited as much as possible. In the case of a semiconductor circuit breaker, a method is adopted in which a breaker is performed in a process of increasing an accident current. In this case, there is a difference in the arc extinction method depending on the characteristics of the power semiconductor element used, and the semiconductor circuit breaker using the thyristor forcibly interrupts the current by superimposing a high-frequency current on the fault current. In a semiconductor circuit breaker using a GTO, an off current flows through a gate circuit of the GTO to interrupt the circuit. Recently, a GTO circuit breaker whose main circuit configuration is simpler than a thyristor is often used.

[0004] Semiconductor circuit breakers generate heat during energization, overcurrent,
A new mechanical circuit breaker for a DC feed circuit has been developed because there is no margin for overvoltage and the price of the circuit breaker increases due to heavy use of expensive semiconductors. One of them is to use a vacuum circuit breaker as a breaker for a DC feeding circuit. Compared to aerial arcs, vacuum arcs have a significantly lower arc voltage and positive arc resistance, and vacuum circuit breakers have high-frequency arc extinction characteristics. In current interruption, a method is adopted in which a high-frequency current is superimposed on the interruption current to forcibly form a current zero point, and interruption is performed at the current zero point.

[0005] The above description has been made on the vacuum circuit breaker for the feeding circuit for electric railways. The same circuit breaker is applied to a DC field circuit of an AC generator or a DC magnetic field of a fusion test facility. In a coil power supply circuit or an AC circuit, there is a high-speed circuit breaker that breaks off in the process of increasing the short-circuit current.

[0006]

In order to interrupt a large direct current with a vacuum circuit breaker, a circuit and a switch for supplying a high-frequency current are required in addition to a vacuum valve as a main arc-extinguishing chamber. In particular, when the fault current is interrupted during the rising process, it is required that the vacuum valve, which is the main arc-extinguishing chamber, and the switch for flowing the high-frequency current be accurately driven at high speed.

[0007] The present invention has been made in view of the above,
A plurality of vacuum valves can be driven at high speed without time delay, a wipe spring for securing a contact pressure in a state where the main contacts are turned on can be eliminated, the configuration can be simplified, and the operation mechanism can be simplified. Provided is a vacuum circuit breaker that can reduce the operating force, shorten the charging time for a capacitor serving as a high-frequency current source, increase the speed, and reduce the number of specific chargers. The purpose is to:

[0008]

According to a first aspect of the present invention, two vacuum valves are arranged such that each movable shaft is opposed to each other and each central axis is linear. ,
The gist is that the two movable shafts are coupled via a magnetic material, and a magnet that magnetically acts on the magnetic material to drive the two movable shafts in one direction is arranged around the magnetic material. I do.
With this configuration, a suction force for driving the two movable shafts in one direction by the magnet always acts on the magnetic material. When one of the vacuum valves is turned on, this turned-on state is maintained and the contact pressure is applied, while the other vacuum is turned on. The valve is kept open.
In this state, when another operation mechanism is operated to apply an operation force in the opposite direction that exceeds the attraction force between the magnet and the magnetic body, one of the vacuum valves is opened and the other vacuum valve is turned on. Thus, the two movable shafts of the two vacuum valves are directly interlocked via the magnetic material.

According to a second aspect of the present invention, two vacuum valves are arranged such that their movable axes are opposed to each other and their central axes are linear, and the two movable axes are connected via a magnetic material. A magnet that magnetically acts on the magnetic body to drive the two movable shafts in one direction is disposed on one of the vacuum valves facing the surface of the magnetic body orthogonal to the central axis. Is the gist. With this configuration, the magnetic material is constantly applied with a suction force for driving the two movable shafts in one direction by the magnet. When one of the vacuum valves is turned on, this turned-on state is maintained and the contact pressure is applied, while the other vacuum is turned on. The valve is kept open.

In this state, when another operating mechanism is operated to apply an operating force in a direction opposite to the attractive force between the magnet and the magnetic body, one of the vacuum valves is opened and the other vacuum valve is turned on. Becomes The attraction force of the magnetic substance by the magnet can be controlled by adjusting the facing area between the magnetic substance and the magnet. As described above, the two movable shafts of the two vacuum valves are directly interlocked via the magnetic material.

According to a third aspect of the present invention, two vacuum valves are arranged so that their respective movable shafts face each other so that their respective central axes are linear, and the two movable shafts are connected via a first magnet. The gist of the present invention is that a second magnet that magnetically acts on the magnetic body to drive the two movable shafts in one direction is arranged around the magnetic body. With this configuration, a repulsive force for driving both movable shafts in one direction is always applied to the first magnet by the second magnet, and when one of the vacuum valves is closed, this closed state is maintained and the contact pressure is reduced. In addition, the other vacuum valve is kept open. In this state, when another operating mechanism is operated to apply an operating force in the opposite direction exceeding the attractive force between the second magnet and the first magnet, one of the vacuum valves is opened and the other vacuum valve is opened. It will be in the input state. Thus, the two movable shafts of the two vacuum valves are directly interlocked via the magnetic material.

According to a fourth aspect of the present invention, a vacuum valve is connected in series with the disconnecting portion, and a series circuit of the first switch and any one of the primary coils of the transformer or the current transformer is connected in parallel with the vacuum valve. , A series circuit of a capacitor and a second switch is connected to both ends of a secondary coil of either the transformer or the current transformer, and a charger is connected to the capacitor. . With this configuration, the capacitor is always charged by the charger. When an overcurrent flows during energization by closing the disconnection portion and the vacuum valve, the vacuum valve opens at a high speed and the main contacts are bridged by an arc. When the first and second switches are turned on, the charge stored in the capacitor flows to the secondary coil of the transformer or current transformer. As a result, the high-frequency current induced in the primary coil flows through the vacuum valve, and the high-frequency current is superimposed on the overcurrent flowing through the vacuum valve, thereby forcibly forming a current zero point and extinguishing the vacuum valve. The current is interrupted.

According to a fifth aspect of the present invention, a vacuum valve is connected in series with a disconnecting portion, and a connection point between the disconnecting device and the vacuum valve is connected to one end of a capacitor via a first switch;
The other end of the capacitor is connected to a connection point between the disconnector and the vacuum valve via a first resistor, and a connection point between the first switch and the capacitor is connected to the ground via a second resistor. The gist of the present invention is that a connection point between the other end of the capacitor and the first resistor is connected to the other end of the vacuum valve via a second switch. With this configuration, if the disconnecting portion is closed, the capacitor is always charged with the main circuit voltage. When an overcurrent flows during energization by closing the disconnection portion and the vacuum valve, the vacuum valve opens at a high speed and the main contacts are bridged by an arc. When the first and second switches are turned on, the electric charge stored in the capacitor becomes a high-frequency current and flows through the vacuum valve. The high-frequency current is superimposed on the overcurrent flowing through the vacuum valve, and the current is forcibly forced. A zero point is formed, the vacuum valve is extinguished, and the overcurrent is shut off.

According to a sixth aspect of the present invention, two vacuum valves are arranged so that each movable shaft is opposed to each other and each central axis is linear, and the two movable shafts are joined via a magnetic material. A magnet is provided around the magnetic body to act magnetically on the magnetic body to drive the two movable shafts in one direction, and the magnetic body and the magnet are connected when both of the two vacuum valves are open. The gist is that the magnetic body and the magnet are arranged in a positional relationship that minimizes the magnetic resistance. With this configuration,
Both movable shafts of the two vacuum valves are directly interlocked via a magnetic body. Attraction to the magnetic body drives the two movable shafts in one direction by the magnet, but at the position where the magnetic resistance between the magnetic body and the magnet is minimized, the attraction applied to the magnetic body by the magnet is maximized. When the operation mechanism is not operated, both of the two vacuum valves can be stopped in the open state.

According to a seventh aspect of the present invention, two vacuum valves are arranged so that their movable axes are opposed to each other so that their central axes are linear, and the two movable axes are connected via a magnetic material. Around this magnetic body, two magnets are provided which act magnetically on the magnetic body to drive the two movable shafts in one direction, and the magnetic body and the two magnets are the two vacuum valves. Are arranged in such a manner that the magnetic resistance between the magnetic body and the two magnets is minimized in the open state, and the two magnets are connected by a fixed magnetic body, and a coil is provided on the fixed magnetic body. And a power source is connected to both ends of the coil via a switch. With this configuration, an attractive force that drives the two movable shafts in one direction is applied to the magnetic body by the magnet, and the two movable shafts of the two vacuum valves are directly interlocked via the magnetic body. When current is passed through the coil while both movable shafts are operating, the combined magnetic flux of the magnetic flux generated in the fixed magnetic body and the magnetic flux generated by the magnet by this causes the two vacuum valves to be in a position where both vacuum valves are open. Both movable axes can be stopped in a short time.

According to an eighth aspect of the present invention, a vacuum valve is connected in series with the disconnecting portion, and a first switch, a diode, a second switch, a capacitor, and a third switch are connected from a connection point between the disconnector and the vacuum valve. Connected to the other end of the vacuum valve via a series circuit of a fourth switch connected between a connection point of the diode and a second switch and a connection point of the capacitor and a third switch; A fifth switch is connected between a connection point between the second switch and the capacitor and a connection point between the third switch and the other end of the vacuum valve, and a resistor is connected from a connection point between the diode and the second switch via a resistor. To the ground, a charger is connected to the connection point of the third switch and the fifth switch, and one of the second and third switches and the fourth and fifth switches is closed. When the other is open On purpose made it to the gist. With this configuration, the capacitor is charged by the charger when the second and third switches are closed and the first, fourth, and fifth switches are open. When the first switch is turned on, the electric charge stored in the capacitor is discharged through the vacuum valve, but the high-frequency current at that time is cut off by a half-wave by the diode, so that the capacitor has a reverse charge voltage to the original charging voltage. Polar voltage remains.

Next, when the first, second and third switches are opened and the fourth and fifth switches are turned on, the residual voltage of the capacitor as viewed from the charger side decreases in value with the same polarity as the initial charging voltage. In this state, the capacitor is recharged from the charger by the difference between the initial charging voltage and the residual voltage after discharging.

According to a ninth aspect of the present invention, the movable shaft of the first vacuum valve and each movable shaft of a plurality of second vacuum valves each having a bellows smaller in diameter than the bellows of the first vacuum valve. The gist of the invention is that, when one of the first vacuum valve and the second vacuum valve is turned on, the other is opened.

With this configuration, a force in the direction of closing the main contact proportional to the bellows diameter acts on the vacuum valve due to the atmospheric pressure. This force is in the opposite direction to the first and second vacuum valves, and the resultant is the difference between them. Therefore, the operating force for operating the first and second vacuum valves by another operating mechanism is reduced. The first and second
The two movable shafts of the vacuum valve are directly interlocked.

According to a tenth aspect of the present invention, in the vacuum circuit breaker of the ninth aspect, the inner area of the bellows of the first vacuum valve and the inner area of each bellows of the plurality of second vacuum valves are reduced. The gist is to make the sum approximately equal. With this configuration, in the first vacuum valve and the second vacuum valve, forces in directions opposite to each other due to the atmospheric pressure of the bellows become substantially equal. Therefore, the resultant force, which is the difference between them, is almost zero, and the operating force for operating the first and second vacuum valves by another operating mechanism is further reduced.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a first embodiment of the present invention. First, the configuration of the vacuum circuit breaker according to the present embodiment will be described. The movable shafts 2 and 8 of two vacuum valves 1 and 7 are connected linearly via a magnetic body 6. A magnet 5 fixed to an insulating frame (not shown) is arranged around the magnetic body 6. An induction plate 4a is attached to the movable shaft 2, and an electromagnetic coil 4 is fixed to an insulating frame (not shown) facing the plate surface of the induction plate 4a, and switches (not shown) are provided at both ends of the electromagnetic coil 4. Operation power is connected via. 3 and 9 are bellows, respectively.

Next, the operation of the vacuum circuit breaker configured as described above will be described. In the state shown in FIG. 1, the magnetic body 6 is attracted by the magnet 5 and the movable shafts 2 and 8 are acted on upward in the drawing. The connection state is maintained, and a contact pressure is further applied. In the vacuum valve 7, the main contact maintains an open state. Next, at the time of operation, the switch connected to the electromagnetic coil 4 is turned on,
A large operating current flows at a high frequency through the electromagnetic coil 4, and an eddy current is induced in the induction plate 4 a by the influence of the operating current, and a repulsive force is generated between the eddy current and the operating current. The movable shaft 2 is driven at a high speed in a downward direction, and the main contact of the vacuum valve 1 is opened, and the main contact of the vacuum valve 7 is turned on. Thereafter, the movable shafts 2 and 8 and the magnetic body 6 are driven upward by an external operation mechanism, and stop in a state where both main contacts of the vacuum valves 1 and 7 are opened. Further, when the movable shafts 2, 8 and the magnetic body 6 are driven upward by an external operation mechanism, the state shown in FIG. 1 is obtained.

The vacuum circuit breaker of the present embodiment eliminates the need for a wipe spring for applying a contact pressure when the main contact of the vacuum valve 1 is turned on due to such a configuration and operation. The magnetic material 6
Since the movable shafts 2 and 8 are directly interlocked via the control unit, the operation delay due to the play of the connecting portion is eliminated.

FIG. 2 shows a second embodiment of the present invention. In FIG. 2 and the drawings showing each of the following embodiments of the third embodiment, the same or equivalent components as those in FIG. 1 are denoted by the same reference numerals as those in FIG. Is omitted.

In the present embodiment, two vacuum valves 1
The movable shafts 2 and 8 are connected linearly via a magnetic body 26, and are fixed to an insulating frame (not shown) on one of the vacuum valves 1 facing a surface of the magnetic body 26 perpendicular to the central axis. Magnet 25 is arranged.

In the state shown in FIG.
The attraction force of the magnet 25 acts, and the force acts on the movable shafts 2 and 8 in the upward direction in the figure, so that the main contacts of the vacuum valve 1 maintain the connected state, and further the contact pressure is applied. . In the vacuum valve 7, the main contact maintains an open state.
Next, at the time of operation, a switch connected to the electromagnetic coil 4 is turned on, and a large operation current flows at a high frequency through the electromagnetic coil 4, and an eddy current is induced in the induction plate 4a under the influence of the operation current. A repulsive force is generated between the currents, and the repulsive force exceeds the attractive force between the magnet 25 and the magnetic body 26, drives the movable shaft 2 downward at a high speed, opens the main contact of the vacuum valve 1, and opens the vacuum valve 7. The main contact turns on. Thereafter, the movable shafts 2 and 8 and the magnetic body 26 are driven upward by an external operation mechanism, and stop with both of the main contacts of the vacuum valves 1 and 7 being opened. Further, when the movable shafts 2, 8 and the magnetic body 26 are driven upward by an external operation mechanism, the state shown in FIG. 2 is obtained.

The vacuum circuit breaker of the present embodiment eliminates the necessity of a wipe spring for applying a contact pressure when the main contact of the vacuum valve 1 is turned on due to such a configuration and operation. In addition, the magnetic material 2
Since the movable shafts 2 and 8 are directly interlocked via 6,
The operation delay due to the backlash of the connecting portion is eliminated, and the movable shafts 2 and 8 are applied with upward force by the force acting on the magnetic body 26 by the magnetic flux of the magnet 25, thereby controlling the cross-sectional area of the short gap between the magnet 25 and the magnetic body 26. By doing so, this force can be controlled.

FIG. 3 shows a third embodiment of the present invention. In the present embodiment, the movable shafts 2 and 8 of the two vacuum valves 1 and 7 are connected linearly via the first magnet 36,
Around the first magnet 36, a second magnet 5 fixed to an insulating frame (not shown) is arranged.

In the state shown in FIG. 3, the repulsive force of the second magnet 5 acts on the first magnet 36, and the movable shafts 2, 8
, A force is acting upward in the drawing, and the main contact of the vacuum valve 1 is maintained in a connected state, and a contact pressure is further applied. In the vacuum valve 7, the main contact maintains an open state. Next, at the time of operation, a switch connected to the electromagnetic coil 4 is turned on, and a large operation current flows at a high frequency through the electromagnetic coil 4, and an eddy current is induced in the induction plate 4a under the influence of the operation current. A repulsive force is generated between the currents, and the repulsive force exceeds the attractive force between the second magnet 5 and the first magnet 36,
The movable shaft 2 is driven downward at a high speed, the main contact of the vacuum valve 1 is opened, and the main contact of the vacuum valve 7 is turned on. afterwards,
The movable shafts 2 and 8 and the first magnet 36
Is driven upward, and stops when the main contacts of the vacuum valves 1 and 7 are both opened. Further, when the movable shafts 2 and 8 and the first magnet 36 are driven upward by an external operation mechanism,
The state shown in FIG. 3 is obtained.

The vacuum circuit breaker according to the present embodiment eliminates the need for a wipe spring for applying a contact pressure when the main contact of the vacuum valve 1 is turned on due to such a configuration and operation. In addition, since the movable shafts 2 and 8 are directly interlocked via the first magnet 36, there is no operation delay due to backlash of the connecting portion.

FIG. 4 shows a fourth embodiment of the present invention. In the present embodiment, a switch 41, which is a disconnecting portion, and a vacuum valve 42 are connected in series to the main circuit. A series circuit of a first switch 43 and a primary coil of a transformer or current transformer 44 is connected in parallel with the vacuum valve 42, and a capacitor 46 and a second coil are connected to a secondary coil of the transformer or current transformer 44. Is connected to a series circuit of the switch 45, and a charger 47 is connected to the capacitor 46. The other end of the capacitor 46 is connected to the ground via a resistor 48.

The capacitor 46 is always charged by the charger 47. Main circuit switch 41 and vacuum valve 42
Is closed and an overcurrent flows during energization, the vacuum valve 42 opens at a high speed, and the main contacts are bridged by an arc. When the first and second switches 43 and 45 are turned on, the electric charge stored in the capacitor 46 flows to the secondary coil of the current transformer 44, and the high-frequency current induced in the primary coil by this influence causes the vacuum valve 42. And the high-frequency current is superimposed on the overcurrent flowing in the main circuit in the vacuum valve 42 to form a forced current zero point. Since the vacuum valve 42 has a high-frequency arc extinguishing characteristic, the arc is extinguished at this forced current zero point, and as a result, the overcurrent of the main circuit is cut off. Thereafter, when the switch 41 is opened, and then the first and second switches 43 and 45 are opened, the capacitor 46 is charged by the charger 47 again. Here, the first switch 4
3 can be replaced by a diode. By separating the capacitor 46 from the main circuit by the transformer or current transformer 44, the voltage setting of the capacitor 46 can be separated from the main circuit voltage, and a low-voltage capacitor can be used.

FIG. 5 shows a fifth embodiment of the present invention. In the present embodiment, a switch 41, which is a disconnecting portion, and a vacuum valve 42 are connected in series to the main circuit. From the upper end of the vacuum valve 42, a circuit of the first resistor 55, the capacitor 54, the second resistor 56, and the ground is formed.
In addition, the upper end of the same vacuum valve 42 is connected via a first switch 53 to a connection point between a capacitor 54 and a second resistor 56.

A first resistor 55 and a capacitor 54 are connected from the lower end of the vacuum valve 42 via a second switch 57.
Connection point.

When the switch 41 is closed, the capacitor 54 is always charged by the main circuit voltage. When the switch 41 of the main circuit and the vacuum valve 42 are closed and an overcurrent flows during energization, the vacuum valve 42 opens at a high speed and the main contacts are bridged by an arc. When the first and second switches 53 and 57 are turned on, the electric charge stored in the capacitor 54 becomes a high-frequency current and flows to the vacuum valve 42, and the overcurrent flowing in the main circuit in the vacuum valve 42 and the high-frequency current Are superimposed, and a forced current zero is formed. Since the vacuum valve 42 has a high-frequency arc extinguishing characteristic, the arc is extinguished at this forced current zero point, and as a result, the overcurrent of the main circuit is cut off. Thereafter, when the first and second switches 53 and 57 are opened, the capacitor 54 is charged again by the main circuit voltage.

According to the vacuum circuit breaker of the present embodiment, a large-capacity main circuit power supply can be used as a charging power supply for the capacitor 54 by such a configuration and operation.
4 can be charged at high speed, and there is no need to equip a specific charging power source.

FIG. 6 shows a sixth embodiment of the present invention. In the present embodiment, the central axes of the two vacuum valves 1 and 7 are linearly arranged, the movable shafts 2 and 8 of the vacuum valves 1 and 7 are opposed to each other, and the movable shafts 2 and 8 are magnetic materials. 6 are connected. A magnet 5 fixed to an insulating frame (not shown) is arranged around the magnetic body 6, and the magnetic resistance formed by the magnetic body 6 and the magnet 5 is minimized at a position where a gap is formed between the contacts of the two vacuum valves 1 and 7. It is to be.

At the time of operation, a switch connected to the electromagnetic coil 4 is turned on, and a large operation current flows at a high frequency through the electromagnetic coil 4, and an eddy current is induced in the induction plate 4a by the influence of the operation current. A repulsive force is generated between the current and the operating current, and the repulsive force exceeds the attractive force between the magnet 5 and the magnetic body 6, drives the movable shaft 2 downward at high speed, opens the main contact of the vacuum valve 1, opens the vacuum, The main contact of the valve 7 is turned on. Thereafter, the movable shafts 2 and 8 and the magnetic body 6 are driven upward by the attractive force of the magnet 5 and the magnetic body 6, and stop with both of the main contacts of the vacuum valves 1 and 7 being opened. Further, when the movable shafts 2 and 8 and the magnetic body 6 are driven upward by an external operation mechanism, FIG.
The state shown in is shown.

The vacuum circuit breaker according to the present embodiment can be stopped at the positions where the vacuum valves 1 and 7 are in the open state irrespective of the operation of the operating mechanism by the above-described structure and operation. Further, since the movable shafts 2 and 8 are operated in series with each other via the magnetic body 6, the operation delay due to the play of the connecting portion is eliminated.

FIG. 7 shows a seventh embodiment of the present invention. In the present embodiment, in addition to the configuration of the sixth embodiment, a fixed magnetic body 10 for further connecting the magnets 5 is provided, and a coil 11 is wound on the fixed magnetic body 10. I have. An operation power supply is connected to both ends of the coil 11 via a switch (not shown).

At the time of operation, a switch connected to the electromagnetic coil 4 is turned on, and a large operating current flows at a high frequency through the electromagnetic coil 4, and an eddy current is induced in the induction plate 4a under the influence of the operating current. A repulsive force is generated between the current and the operating current, and the repulsive force exceeds the attractive force between the magnet 5 and the magnetic body 6, drives the movable shaft 2 downward at high speed, opens the main contact of the vacuum valve 1, opens the vacuum, The main contact of the valve 7 is turned on. Then, when a switch attached to the coil 11 is turned on and an operation current is supplied to the coil 11, the magnetic flux generated by the coil 11 is changed to the fixed magnetic material 1.
The movable shafts 2 and 8 and the magnetic body 6 are driven upward by a large attractive force to the magnetic body 6 in the magnetic path of the 0-magnet 5 and the magnetic body 6, and the main contacts of the vacuum valves 1 and 7 are both opened. Stop in the state of doing. Thereafter, the switch attached to the coil 11 is opened, and the operating current of the coil 11 is cut off. However, the magnetic body 6 remains at the stop position even when the operation current of the coil 11 is lost due to the attraction force of the magnet 5. Next, when the movable shafts 2 and 8 and the magnetic body 6 are further driven upward by an external operation mechanism, the state shown in FIG. 7 is obtained.

The vacuum circuit breaker of the present embodiment can be stopped in a short time without any linear relationship with the operation of the operating mechanism at the positions where both the vacuum valves 1 and 7 are in the open state by such a configuration and operation. . In addition, the movable shafts 2, 8
Are operated directly in conjunction with each other, so that there is no operation delay due to backlash of the connecting portion.

FIG. 8 shows an eighth embodiment of the present invention. In the present embodiment, a switch 41, which is a disconnecting portion, and a vacuum valve 42 are connected in series to the main circuit. From the upper end of the vacuum valve 42, a first switch 73, a diode 74, a second switch 76, a capacitor 77, and a third switch.
The switch 78 is connected to the lower terminal of the vacuum valve 42. A fourth switch 75 is connected between a connection point between the diode 74 and the second switch 76 and a connection point between the capacitor 77 and the third switch 78. The connection point between the second switch 76 and the capacitor 77 and the third switch A fifth switch 79 is connected to a connection point between the switch 78 and the lower end of the vacuum valve 42. A resistor 81 is connected between the connection point of the diode 74 and the second switch 76 and the ground, and a charger 80 is connected between the lower end of the vacuum valve 42 and the ground.

The second switch 76 and the third switch 78 are always in the same state, and the fourth switch 75 and the fifth switch 79 are always in the same state.
Switch 76, the third switch 78 and the fourth and fifth switches 75, 79 are in different states. That is, when the second and third switches 76 and 78 are in the closed state, the fourth and fifth switches 75 and 79 are in the open state, and when the second and third switches 76 and 78 are in the open state, the fourth and fifth switches 76 and 78 are in the open state. Fourth, the fifth switches 75 and 79 are in a closed state.

First, the second and third switches 76 and 78 are closed and the first, fourth and fifth switches 73, 75 and 7 are closed.
Reference numeral 9 denotes an open circuit state, and the capacitor 77 is charged by the charger 80. When the first switch 73 is turned on, the electric charge stored in the capacitor 77 is discharged through the vacuum valve 42, but the high-frequency current at that time is cut off by a half-wave by the diode 74, so that the capacitor 77 has an initial charging voltage. And a voltage of the opposite polarity remains.

Next, the first, second, and third switches 73, 73
76 and 78 are opened, and the fourth and fifth switches 75 and 79 are opened.
Is charged, the residual voltage of the capacitor 77 as viewed from the charger 80 is in a state of decreasing in value with the same polarity as the initial charging voltage, and the difference between the initial charging voltage and the residual voltage after discharging from the charger 80 is determined. 77 can be recharged, and the charging time is reduced.

FIG. 9 shows a ninth embodiment of the present invention. In the present embodiment, the first vacuum valve 1 of the large-diameter bellows 3 and the plurality of second vacuum valves 7 of the small-diameter bellows 9 are mounted on the upper side via the connection plate 12. Due to the atmospheric pressure, forces in the direction of closing the main contacts of the first and second vacuum valves 1 and 7 act on the movable shafts 2 and 8 in proportion to the internal sectional area of the bellows. Then, since the force by the first vacuum valve 1 and the force by the second vacuum valve 7 are opposite to each other, the resultant force is the difference between them. Thereby, the operating force for operating the first and second vacuum valves 1 and 7 from the outside is reduced. Further, since the movable shafts 2 and 8 are directly interlocked via the connection plate 12, the operation delay due to the play of the connecting portion is eliminated.

When the inner cross-sectional area of the bellows 3 and the sum of the inner cross-sectional areas of the plurality of bellows 9 are equal, the force applied to the connecting plate 12 due to the atmospheric pressure by the bellows 3 and 9 is almost eliminated. Thereby, the operating force for operating the first and second vacuum valves 1 and 7 from the outside is further reduced.

[0050]

As described above, according to the first aspect of the present invention, the two vacuum valves are arranged so that the respective movable shafts are opposed to each other so that the respective central axes are linear. The shafts are coupled via a magnetic body, and a magnet that magnetically acts on the magnetic body to drive the two movable shafts in one direction is disposed around the magnetic body. The suction force for driving the movable shaft in one direction always acts, and the two movable shafts of the two vacuum valves are directly operated in conjunction with each other via the magnetic material, so that one vacuum valve is turned on and the other vacuum valve is turned on. Can be driven at high speed with no time delay, and the operating force of the operating mechanism can be reduced. Further, it is not necessary to provide a wipe spring for ensuring the contact pressure of one of the vacuum valves, so that the configuration can be simplified.

According to the second aspect of the present invention, two vacuum valves are arranged so that their movable axes are opposed to each other so that their central axes are linear, and the two movable axes are connected via a magnetic material. And
A magnet that acts magnetically on the magnetic body to drive the two movable shafts in one direction is disposed on one of the vacuum valves facing the surface of the magnetic body perpendicular to the central axis. In addition to the same effect as the effect of the invention described in Item 1, the attraction force of the magnetic body by the magnet can be controlled by adjusting the facing area between the magnetic body and the magnet.

According to the third aspect of the present invention, two vacuum valves are arranged so that their movable axes are opposed to each other and their central axes are linear, and the two movable axes are connected via the first magnet. A second magnet, which magnetically acts on the magnetic body to drive the two movable shafts in one direction, is arranged around the magnetic body, so that the same effect as the invention of claim 1 is provided. Has the effect.

According to the fourth aspect of the present invention, the vacuum valve is connected in series with the disconnecting portion, and the first valve is connected in parallel with the vacuum valve.
A series circuit of a switch and a primary coil of either a transformer or a current transformer is connected, and a series circuit of a capacitor and a second switch is provided at both ends of a secondary coil of the transformer or the current transformer. Since the capacitor is connected to the charger, the capacitor serving as the high-frequency current source is separated from the main circuit by the transformer or the current transformer, so that the voltage setting of the capacitor can be separated from the main circuit voltage. In addition, a small capacitor for low voltage can be used.

According to the fifth aspect of the present invention, a vacuum valve is connected in series with the disconnecting portion, and a connection point between the disconnecting device and the vacuum valve is connected to one end of the capacitor via the first switch. Is connected to the connection point of the disconnector and the vacuum valve via a first resistor from the other end of the capacitor, and is connected to the ground via a second resistor from the connection point of the first switch and the capacitor. Since a connection point between the other end and the first resistor is connected to the other end of the vacuum valve via a second switch, a large-capacity main circuit power supply is used as a charging power supply for a capacitor serving as a high-frequency current source. Charging time can be shortened, and the number of specific chargers can be reduced.

According to the sixth aspect of the present invention, two vacuum valves are arranged so that each movable shaft is opposed to each other and each central axis is linear, and the two movable shafts are joined via a magnetic material. And
A magnet is provided around the magnetic body to act magnetically on the magnetic body to drive the two movable shafts in one direction, and the magnetic body and the magnet are connected when both of the two vacuum valves are open. Because the magnetic body and the magnet are arranged in a positional relationship that minimizes the magnetic resistance, the two movable shafts of the two vacuum valves are directly interlocked via the magnetic body, and when other operating mechanisms are not operated, Since the two vacuum valves are stopped at the position where the main contacts are both open, the opening and closing of one vacuum valve by operating the operating mechanism, and the opening and closing of the other vacuum valve without time delay. It can be driven and the operating force of the operating mechanism can be reduced.

According to the seventh aspect of the present invention, two vacuum valves are arranged so that the respective movable shafts face each other and the respective central axes are linear, and the two movable shafts are connected via a magnetic material. And
Around this magnetic body, two magnets are provided which act magnetically on the magnetic body to drive the two movable shafts in one direction, and the magnetic body and the two magnets are the two vacuum valves. Are arranged in such a manner that the magnetic resistance between the magnetic body and the two magnets is minimized in the open state, and the two magnets are connected by a fixed magnetic body, and a coil is provided on the fixed magnetic body. And a power supply is connected to both ends of this coil via a switch, so that when both movable shafts are operating, a current flows through the coil, so that the two vacuum valves have both main contacts open. Since it stops at the position in a short time, the opening and closing of one vacuum valve and the opening and closing of the other vacuum valve by operating the operating mechanism from this state can be driven without further delay.

According to the eighth aspect of the present invention, a vacuum valve is connected in series with the disconnecting portion, and the first switch, the diode, the second switch, the capacitor and the third switch are connected from the connection point between the disconnector and the vacuum valve. Connected to the other end of the vacuum valve through a series circuit of switches, and the diode and the second
A fourth switch is connected between the connection point of the switch and the connection point of the capacitor and the third switch, and the connection point of the second switch and the capacitor, the third switch and the other end of the vacuum valve. A fifth switch is connected between the third switch and the second switch. The fifth switch is connected to the ground via a resistor from the connection between the diode and the second switch. The fifth switch is connected to the third switch and the fifth switch. A charger was connected so that when one of the second and third switches and the fourth and fifth switches were in the closed state, the other was in the open state,
Since the high-frequency current is cut off by a half-wave by the diode when the capacitor serving as the high-frequency current source is discharged, a voltage having a polarity opposite to the initial charging voltage remains in the capacitor. In this state, the first, second, and third switches are switched. When the fourth switch is turned on and the fourth and fifth switches are turned on, the residual voltage of the capacitor as viewed from the charger side is reduced in value with the same polarity as the initial charging voltage. Therefore, since the capacitor only needs to be recharged from the charger by the difference between the initial charging voltage and the residual voltage after discharging, the charging time can be reduced.

According to the ninth aspect of the present invention, the movable shafts of the plurality of second vacuum valves each having a movable shaft of the first vacuum valve and a bellows smaller in diameter than the bellows of the first vacuum valve. And when one of the first vacuum valve and the second vacuum valve is turned on, the other is opened. Therefore, a bellows is provided between the first vacuum valve and the second vacuum valve. The forces in the direction of closing the main contact caused by the atmospheric pressure are opposite to each other, and the resultant force is the difference between them. Therefore, the operating force for operating the first and second vacuum valves by other operating mechanisms is reduced. Can be.

According to the tenth aspect of the present invention, the first
The inner area of the bellows of the vacuum valve,
And the sum of the inner areas of the bellows of each of the vacuum valves is substantially equal, so that the forces in the first vacuum valve and the second vacuum valve, which are caused by the bellows in the opposite directions due to the atmospheric pressure, are substantially equal to each other. Since a certain resultant force is almost zero, the operating force for operating the first and second vacuum valves by another operating mechanism can be further reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a vacuum circuit breaker according to a first embodiment of the present invention in a longitudinal section.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention in a longitudinal section.

FIG. 3 is a configuration diagram showing a third embodiment of the present invention in a longitudinal section.

FIG. 4 is a circuit diagram according to a fourth embodiment of the present invention.

FIG. 5 is a circuit diagram according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram showing a sixth embodiment of the present invention in a longitudinal section.

FIG. 7 is a configuration diagram showing a seventh embodiment of the present invention in a longitudinal section.

FIG. 8 is a circuit diagram according to an eighth embodiment of the present invention.

FIG. 9 is a configuration diagram showing a ninth embodiment of the present invention in a longitudinal section.

[Description of Signs] 1,7,42 Vacuum valve 2,8 Movable shaft 3,9 Bellows 4 Electromagnetic coil 5,25,36 Magnet 6,26 Magnetic body 10 Fixed magnetic body 11 Coil 41 Switch (disconnecting part) 43,53 , 73 First switch 44 Transformer or current transformer 45, 57, 76 Second switch 46, 54, 77 Capacitor 47, 80 Charger 48, 55, 56, 81 Resistance 74 Diode 75 Fourth switch 78 3rd switch 79 5th switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshimitsu Niwa 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Plant Co., Ltd. (72) Inventor Jun Matsuzaki 1 Toshiba-cho, Fuchu-shi, Tokyo F-term in Fuchu Plant, Toshiba Corporation (reference) 5G028 AA01 DB01 FB07 FC01

Claims (10)

[Claims] 1. Two vacuum valves are arranged such that their movable axes are opposed to each other and their central axes are linear, and the two movable axes are connected via a magnetic material. Is a vacuum circuit breaker, wherein a magnet which magnetically acts on the magnetic body to drive the two movable shafts in one direction is arranged. 2. A vacuum valve having two movable valves opposed to each other so that each central axis is linear, and the two movable shafts are connected via a magnetic material. A vacuum shut-off, characterized in that a magnet that acts magnetically on the magnetic body to drive the two movable shafts in one direction is disposed on one of the vacuum valves facing a surface orthogonal to the axis. vessel. 3. Two vacuum valves are arranged such that their movable axes are opposed to each other and their central axes are linear, and the two movable axes are connected via a first magnet. A vacuum circuit breaker, wherein a second magnet that magnetically acts on the magnetic body to drive the two movable shafts in one direction is arranged around the periphery. 4. A vacuum valve is connected in series with the disconnecting part, and a series circuit of a first switch and a primary coil of any one of a transformer and a current transformer is connected in parallel with the vacuum valve. A vacuum circuit breaker comprising a series circuit of a capacitor and a second switch connected to both ends of a secondary coil of either a transformer or a current transformer, and a charger connected to the capacitor. 5. A vacuum valve is connected in series with a disconnecting portion, a connection point between the disconnecting device and the vacuum valve is connected to one end of a capacitor via a first switch, and a first resistor is connected to the other end of the capacitor. Is connected to the connection point between the disconnector and the vacuum valve via the first switch, the connection point between the first switch and the capacitor is connected to the ground via a second resistor, and the other end of the capacitor is connected to the first resistor. A vacuum circuit breaker which is connected from a connection point to the other end of the vacuum valve via a second switch. 6. A vacuum valve having two movable shafts opposed to each other and arranged so that their central axes are linear, and the two movable shafts are joined via a magnetic body. Is provided with a magnet that magnetically acts on the magnetic body to drive the two movable shafts in one direction, and the magnetic body and the magnet are connected between the magnetic body and the magnet when the two vacuum valves are both in the open state. A vacuum circuit breaker, wherein the vacuum circuit breakers are arranged in a positional relationship that minimizes magnetic resistance of the vacuum circuit breaker. 7. Two vacuum valves are arranged so that their movable axes face each other and their central axes are linear, and the two movable axes are connected via a magnetic material. Is provided with two magnets that act magnetically on the magnetic body to drive the two movable shafts in one direction, and the magnetic body and the two magnets are connected when the two vacuum valves are both in the open state. The magnetic body and the two magnets are arranged in a positional relationship to minimize the magnetic resistance, the two magnets are connected by a fixed magnetic body, and a coil is wound on the fixed magnetic body. A vacuum circuit breaker characterized in that a power supply is connected to both ends of the device via switches. 8. A vacuum valve is connected in series with the disconnecting portion, and a connection point between the disconnecting device and the vacuum valve is connected through a series circuit of a first switch, a diode, a second switch, a capacitor, and a third switch. A second switch connected to the other end of the vacuum valve, a fourth switch connected between a connection point between the diode and a second switch, and a connection point between the capacitor and a third switch; A fifth switch is connected between the connection point of the third switch and the connection point of the other end of the vacuum valve, and the diode and the second switch are connected to each other.
Is connected to the ground via a resistor from the connection point of the switch, a charger is connected to the connection point of the third switch and the fifth switch, and the second and third switches are connected to the fourth and fifth switches. A vacuum circuit breaker characterized in that one of the switches is open when one of them is closed. 9. The movable shaft of the first vacuum valve is connected to each movable shaft of a plurality of second vacuum valves each having a bellows smaller in diameter than the bellows of the first vacuum valve; The vacuum circuit breaker is characterized in that when one of the vacuum valve and the second vacuum valve is turned on, the other is opened. 10. The system according to claim 9, wherein the sum of the inner areas of the bellows of the first vacuum valve and the inner areas of the bellows of the plurality of second vacuum valves is substantially equal. Vacuum circuit breaker.