KR20080005870A - Circuit breaker - Google Patents

Abstract

A circuit breaker is provided to decrease a size of a manipulation unit for a vacuum valve by reducing a bounce of an axis on a movable electrode using a simple structure. A circuit breaker includes a vacuum valve(51), a manipulation unit, and opening units(170,171). The manipulation unit maintains a closed condition of the vacuum valve using an attractive force from a permanent magnet(306). The opening units move a manipulation axis(65) of the manipulation unit to an open direction by using an electrical repelling force. A release device(900) releases a closed station of the vacuum valve due to the manipulation unit between the opening units and the manipulation unit in response to the opening process of the opening units.

Description

Breaker {CIRCUIT BREAKER}

The present invention relates to a circuit breaker having an opening means for driving the operating shaft of the vacuum valve at a high speed in the opening direction by an electromagnetic repulsion action.

The opening means for driving the operating shaft of the vacuum valve at high speed in the opening direction by the electromagnetic repulsion action is constituted by a coil and a ring-shaped copper plate disposed to face the coil valve. The coil of the opening means is rapidly excited by the capacitor discharge and the like, and the vacuum valve is operated by using the electromagnetic repulsive force between the coil current and the eddy current generated in the copper plate.

Circuit breakers with electromagnetic repulsion mechanisms include a DC circuit breaker and a high speed circuit breaker. The former injects the charge previously charged in the capacitor in the opposite direction to the system current to forcibly cut off the current zero point. When a ground fault occurs in the DC system, a fast rising ground current, which is determined by the circuit constant of resistance and inductance, flows, so that high-speed response is required for the breaking operation.

On the other hand, the latter is related to the self-generating system, which is important by preventing power leakage from the self-generator during power system outages, avoiding power supply highways caused by overload, and high-speed conversion from the electrostatic system to the health system. It is introduced for the purpose of continual operation of the load. Both of them use electronic repulsion mechanisms because they require a response within a few ms after receiving the opening command.

As the circuit breaker equipped with this electromagnetic repulsion mechanism, for example, as shown in Patent Literature 1, a vacuum valve, an operation mechanism provided in the opening and closing direction of the vacuum valve, and an electromagnetic repulsion mechanism provided in the middle of the operation mechanism are provided. In addition, a mechanism for reducing the bounce of the shaft on the movable electrode side during the current interruption is provided.

[Patent Document 1]

Japanese Patent Application Laid-Open No. 2000-299041

In the above-mentioned conventional circuit breaker, not only a predetermined opening speed is obtained at high speed but also an electromagnetic repulsion force that exceeds the suction force of the permanent magnet that maintains the closed pole state is required, thereby increasing the size of the electromagnetic repulsion mechanism and increasing the power supply capacity. Have no choice but to. In addition, a vacuum valve is disposed between the vacuum valve and its operating mechanism in series in the vertical direction in order to reduce the bounce of the shaft on the movable electrode side that occurs when the electromagnetic reaction mechanism and the electromagnetic reaction mechanism are operated. It is necessary to move the electromagnetic repulsion mechanism and the spring reduction mechanism of the shaft on the side of the movable electrode together when opening and closing the vacuum valve by the operating mechanism.

For this reason, when the operation mechanism of the vacuum valve is, for example, an electronic operation system, the capacity of the permanent magnet, the excitation coil, and the like, which are its components, must be increased, thereby increasing the operation mechanism of the vacuum valve. Moreover, the operability of the operation mechanism of a vacuum valve may also fall by this.

An object of the present invention is to provide a circuit breaker with good operability while facilitating release of the closed pole state by the electromagnetic repulsion mechanism, and reducing the springing of the movable electrode shaft caused during the current interruption. It is done.

In order to achieve the above object, the first invention provides an operation mechanism for maintaining the vacuum valve in a closed electrode state by suction force of a vacuum valve and a permanent magnet, and opening means for driving the operation shaft of the operation mechanism in an open direction by an electromagnetic repulsion action. A circuit breaker comprising: a mechanism for releasing a closed electrode state of the vacuum valve by the operating mechanism in response to the opening operation by the opening means between the opening means and the operation mechanism.

A second invention is a circuit breaker comprising a vacuum valve and an opening means for driving the operation shaft of the vacuum valve in an open direction by an electromagnetic repulsive action, the electromagnetic circuit comprising a coil, a moving core, and a permanent magnet. An operation mechanism for exciting the vacuum valve to perform the closing operation of the vacuum valve, maintaining the closed state of the vacuum valve by the suction force of the permanent magnet, and exciting the coil in the opposite direction to the closing operation to open the vacuum valve. And a release mechanism comprising a link mechanism connected to the operation mechanism to release the closed electrode state of the vacuum valve in response to the opening operation by the opening means.

A third invention is a circuit breaker having a vacuum valve and an opening means for driving the operation shaft of the vacuum valve in an open direction by an electromagnetic repulsive action, comprising: an electromagnet composed of a coil, a moving core, and a permanent magnet. An operation of exciting the coil to perform the closing operation of the vacuum valve, maintaining the closed state of the vacuum valve by the suction force of the permanent magnet, and exciting the coil in the opposite direction to the closing operation to open the vacuum valve. And a release mechanism comprising a mechanism connected to the operation mechanism to release the closed electrode state of the vacuum valve in response to the opening operation by the opening means.

Moreover, the 4th invention is the circuit breaker provided with two switch groups which consist of a main switch and the subswitch which operate | moves in connection with it, The opening which drives an operation shaft to an opening direction by an electromagnetic repulsion action to one switch group. And an electromagnet composed of a means, a coil, a moving core, and a permanent magnet to excite the coil with respect to the two switch groups to perform a closing operation, and to maintain a closed pole state by the suction force of the permanent magnet. And a release mechanism comprising an operation mechanism for exciting the coil in the opposite direction to the opening mechanism, and a link mechanism connected to the operation mechanism to release the closed state of the main switch in response to the opening operation by the opening means. Characterized in that provided.

In addition, the fifth invention is a circuit breaker having two switch groups comprising a main switch and a sub-switch that operates in conjunction with the first switch, the opening being for driving the operation shaft in the opening direction by electromagnetic repulsion to one switch group. An electromagnet composed of a means, a coil, a moving core, and a permanent magnet is loaded to excite the coil with respect to the two switch groups, and the closing operation is performed by the suction force of the permanent magnet. And a release mechanism consisting of a lever mechanism connected to the operation mechanism to release the closed state of the main switch in response to the opening operation by the opening means, by exciting the coil in the opposite direction to the opening operation. It is characterized by one.

Further, in the sixth invention, in the first to fifth inventions, the electromagnet is provided in parallel with the opening means and the operation mechanism.

Further, in the fourth to sixth inventions, the release mechanism is provided with adjusting means for adjusting the operation timing of two switch groups that are opened by the electromagnetic repulsive action by the closed pole means.

According to the present invention, since the springing of the movable electrode side shaft generated during the current interruption by the electromagnetic repulsion mechanism can be reduced with a simple configuration, the enlargement of the operation mechanism of the vacuum valve can be suppressed, and the electronic repulsion mechanism By the spring of the movable electrode shaft, which occurs during the current interruption, the permanent magnet and the moving core of the vacuum valve operation mechanism can be quickly released, that is, the closed electrode of the vacuum valve can be quickly released with a small amount of force. Can provide.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the circuit breaker of this invention is described using drawing.

1 to 7 show one embodiment of a current-type DC circuit breaker which is a circuit breaker of the present invention, and FIG. 1 is a left side view of an embodiment of a current-type DC circuit breaker which is a circuit breaker of the present invention, and FIG. Back view of one embodiment of a current-type DC circuit breaker which is a circuit breaker of the present invention shown, FIG. 3 is a right side view of an embodiment of the current type DC circuit breaker which is a circuit breaker of the present invention shown in FIG. 1, and FIG. 4 is a view shown in FIG. 5 is a front view of an embodiment of a current-type DC circuit breaker which is a circuit breaker of the present invention. FIG. 5 is a system circuit diagram to which an embodiment of the current-type DC circuit breaker which is a circuit breaker of the present invention shown in FIG. 1 is applied. FIG. 6 is the present invention shown in FIG. 7 is a time chart showing an operation during an accident of an embodiment of a current-type DC circuit breaker which is a circuit breaker of FIG. A time chart diagram illustrating the operation of.

First, using and driving methods of an embodiment of a current-type DC circuit breaker which is a circuit breaker of the present invention will be described with reference to FIGS. 5 to 7.

In FIG. 5, reference numeral 1 denotes a DC power supply, and a general DC power supply circuit supplies a voltage of positive electrode 1500V. 2 represents a load such as a train. 3 is a power supply line for supplying electricity to the load, and 4 represents a return line connecting the load 2 and the direct current power source 1. The current-type DC circuit breaker 5, which is a breaker of the present invention, is inserted in the middle of the feed line 3 to switch the power supplied from the DC power supply 1 to the load 2.

The current-type DC circuit breaker 5 is composed of four switches and a control device 50 of the first main switch 51, the second main switch 52, the first sub switch 53, and the second sub switch 54. Consists of. A first condenser 55, a second condenser 56, and a reactor 57 are connected to the current type DC circuit breaker 5. The first main switch 51 and the second main switch 52 are inserted in series with the feed line 3, and the first main switch 51 is loaded on the DC power source 1 side and the second main switch 52 is loaded. It is arrange | positioned at (2) side, respectively. The series circuit of the first sub-switch 53, the first condenser 55, and the reactor 57 is connected in parallel with the first main switch 51, and the second sub-switch 54 and the second condenser 56 are connected. The series circuit of is connected in parallel to the first capacitor 55.

The current transformer 58 provided in the feed line 3 detects the conduction current of the feed line 3, and inputs the current value into the overcurrent tripping device 59. The overcurrent tripping device 59 outputs the opening command 11 when the current value flowing through the feeder line 3 with the cutoff set value reaches or exceeds the set value. The control device 50 receives the opening command 11 from the external command 10 or the overcurrent tripping device 59 and gives an open / close command to the current-type DC circuit breaker 5.

After the first main switch 51 is opened in conjunction with the first main switch 51, the first sub-switch 53 closes once at a time t1 (for example, 2 ms) and then opens. On the other hand, the second sub-switch 54 is opened in conjunction with the second main switch 52 before the time t2 (for example, 2.5 ms) when the second main switch 52 is opened.

When the load 2 is operated, the first main switch 51 and the second main switch 52 are closed, and a direct current 1500V is applied to the load 2. At this time, the first sub switch 53 is opened and the second sub switch 54 is closed. The first condenser 55 and the second condenser 56 are charged to +2000 V on the DC power source 1 side as a reference.

If a failure of the load 2 or a ground fault of the feed line 3 occurs, a very large, fast rising fault current flows through the feed line 3 determined by the circuit constant. For example, with a circuit resistance of 15 mΩ and a circuit inductance of 150 μH, the maximum reached current is 100 kA and the maximum rush rate is 10 kA / ms. In the event of such a fault current, the fault current must be shut off at high speed in order to minimize the effect on the installation. First, the fault current value is detected by the current transformer 58 and input to the overcurrent tripping device 59. If the cutoff setting value of the overcurrent tripping device 59 is set to, for example, 12000 A, the opening command 11 is sent to the control device 50 when the accident current value reaches 12000 A. In response to a command from the control device 50, the first main switch 51 is opened. By the opening of the first main switch 51, the first sub-switch 53 is closed later in time t1. As a result, the LC resonant circuit including the first condenser 55, the second condenser 56, the reactor 57, the first main switch 51, the first sub switch 53, and the second sub switch 54 is formed. The first and second capacitors 55 and 56, which have been established and charged in advance, are discharged and current currents in directions opposite to the direction of the accident current are injected into the first main switch 51. When the capacitance of the first condenser 55 is 60 μF and the capacitance of the second capacitor 56 is 1200 μF, the current value in the opposite direction is 40 kA at maximum, so before the accident current reaches 40 kA. If the first sub-switch 53 is closed, the fault current and the current current cancel each other. When the current passing through the first main switch 51 becomes zero, the first main switch 51 is cut off. After the first main switch 51 opens, the second main switch 52 opens late at time t3, but if the time t3 is set to satisfy the condition of t3> t1 + t2, the first sub-switch ( Since the second sub-switch 54 does not open before the 53 is closed, the first condenser 55 and the second condenser 56 can be discharged at the same time, and the above-described large current can be coped with. Since the first sub switch 53 and the second sub switch 54 both have closed periods even when the first main switch 51 is shut off, the first condenser 55 and the second condenser ( 56 is charged by the DC power source 1. This charging current is cut off when the charging voltage rises and the circuit current becomes near zero and falls below the cutting current value of the vacuum valve.

On the other hand, the breaking operation of the current-type DC circuit breaker 5 in the normal operation state is based on the external command 10. When the opening command is received by the external command 10, the first main switch 51 and the second main switch 52 open simultaneously. At this time, since the second sub-switch 54 is first opened at the time t2 before the second main switch 52 is opened, the first condenser 55 and the reactor when the first sub-switch 53 is closed. An LC resonant circuit comprising 57, a first main switch 51, and a first sub-switch 53 is established.

Of the first capacitor 55 and the second capacitor 56 previously charged, only the first capacitor 55 is discharged, and a current current in a direction opposite to that of the load current is injected into the first main switch 51. . Here, the maximum value of the load current is equal to or less than the set value 12000 A of the overcurrent tripping device 59. If the maximum value of current current in the case where only the first capacitor 55 is discharged is 14 kA, the maximum load current 12000 A can be canceled, and the first week when the current of the first main switch 51 becomes zero The switch 51 is cut off. In addition, the second main switch 52 disconnects the load 2, the first capacitor 55, and the second capacitor 56 after the breaker opens, thereby preventing an electric shock due to the capacitor charging voltage in the load side circuit. You can prevent it.

Next, an embodiment of the above-described current-type DC circuit breaker as the circuit breaker of the present invention will be described with reference to FIGS.

One embodiment of the current-type DC circuit breaker 5, which is the breaker of the present invention, automatically realizes the operation timing of the four switches described above by means of two electromagnets and a mechanical link configuration. 1 to 4 all show an operating state (the first main switch 51 and the second switch 52 are closed pole states). All four switches are described as vacuum valves having a pair of contacts therein, but they can also be used as air switches.

First, the electrical connection of one Embodiment of the current-type DC circuit breaker 5 which is a circuit breaker of this invention is demonstrated.

The fixed side feeder 10 of the first main switch 51 and the fixed side feeder 114 of the second main switch 52 are connected to a bus (not shown) arranged outside the current-type DC circuit breaker 5. have. The bus bar is connected to one end of the reactor 57. The other end of the reactor 57 is connected to the first condenser 55 and the second condenser 56. The movable conductor 62 of the first main switch 51 is connected to the movable feeder 120 via the current collector 101. The movable side feeder 120 is connected to the DC power supply 1. In addition, the movable conductor 62 of the first main switch 51 and the movable conductor 69 of the first sub-switch 53 are always electrically connected via the conductors 102 and 103, the flexible conductor 104, and the conductor 105. Is connected to.

The feeder 106 and the feeder 107 are fixed to the high conductor 108 of the first sub-switch 53. The feeder 107 is connected to the high conductor 109 of the second sub-switch 54. On the other hand, the feeder 106 is connected to the first capacitor 55 outside of the current-type DC circuit breaker 5. The movable conductor 110 of the second sub-switch 54 is connected to the second capacitor 56 via the conductor 111, the flexible conductor 112, and the feeder 113. The movable conductor 200 of the second main switch 52 is connected to the movable feeder 203 via the current collector 201. The movable side feeder 203 is connected to the load 2. By the above electrical connection method, the system circuit shown in Fig. 5 is realized.

Next, the mechanical structure of one Embodiment of the current-type DC circuit breaker 5 which is a circuit breaker of this invention is demonstrated using FIGS.

The movable conductor 62 of the 1st main switch 51 is pinned to the member 64 as shown in FIG. The operation rod 65 fixes one end to the member 64 and the other end to the hinge 66. The movable conductor 69 of the first sub-switch 53 is connected to the hinge 66 by a pin 534 via the member 67. That is, the movable conductor 62 of the first main switch 51 and the movable conductor 69 of the first sub-switch 53 operate in conjunction with each other. The training rod 65 penetrates through the pin 150 which has been subjected to planar processing on the upper and lower parts. The washer 153, the contact spring 151, and the washer 154 are sandwiched and held by the nut 152 fixed to the pin 150 and the operation rod 65. FIG.

In the state where the first main switch 51 is opened, the hexagonal portion 155 of the upper portion of the operation rod 65 and the pin 150 are engaged by the contact spring 151. On the other hand, when the first main switch 51 is closed, the engagement between the pin 150 and the hexagonal portion 155 is released when the fixed contact 61 and the movable contact 60 of the main switch 51 come into contact with each other. In addition, when the contact spring 151 is compressed, the load of the contact spring 151 becomes the contact force of the contact point in the first main switch 51.

Moreover, the operating rod 65 communicates with the electromagnetic repulsion coil 170 and the rebound plate 171 constituting the opening means. The eddy current is generated in the repulsion plate 171 by the excitation of the electromagnetic repulsion coil 170, and the electromagnetic repulsive force acting between the current of the electromagnetic recoil coil 170 and the eddy current of the rebound plate 171 causes the repulsion plate 171 The member 64 is configured to be received, and the operation rod 65 moves upward in FIG. 1 by the repulsive force.

The movable conductor 200 of the 2nd main switch 52 is pinned to the member 202, as shown in FIG. The operation rod 204 fixes one end to the member 202. The operation rod 204 penetrates through the pin 206 which provided the contact surface flat-processed at the upper and lower parts. The washer 210, the contact spring 212, and the washer 214 are held by the nut 208 fixed to the pin 206 and the operation rod 202. In the open state of the second main switch 53, the hexagonal portion 216 of the upper portion of the operation rod 202 and the pin 206 are engaged by the contact spring 212. Meanwhile, in the closing operation of the second main switch 53, the engagement between the pin 206 and the hexagonal portion 216 is released when the fixed contact 220 and the movable contact 222 of the main switch 53 come into contact with each other. In addition, when the contact spring 212 is compressed, the load of the contact spring 212 becomes the contact force of the contact point in the second main switch 53.

The operation rod 65 of the first main switch 51 and the operation rod 202 of the second main switch 52 are the first main switch 51 in the manipulator case 300 as shown in FIGS. 1 and 3. And the electromagnet 301 provided with respect to the 2nd main switch 52 in parallel. The shaft 302 of the electromagnet 301 is connected to one lever 501 of the main shaft 500 via the member 303. The other lever 503 of the main shaft 500 is connected to an insulating rod 502 extending toward the first main switch 51 and an insulating rod 504 extending toward the second main switch 52. The insulating rod 502 is engaged with the pin 150 by the subshaft 510, and the insulating rod 504 is engaged with the pin 206 by the subshaft 512. That is, as shown in Figs. 1 and 3, the suction force of the electromagnet 301 is the main shaft 500, the levers 501 and 503 and the sub shafts 510 and 512 attached thereto, and the lever 513 provided thereon. , 514 is transmitted to the operation rod 65 in the first main switch 51 and the operation rod 202 in the second main switch 52. In order to insert the 1st main switch 51 and the 2nd main switch 52, the coil 305 in the electromagnet 301 may be excited, and the plunger 304 may be driven downward in the figure.

As described above, the first sub-switch 53 is driven in conjunction with the first main switch 51, but in order to realize the operation timing shown in FIG. 5, as shown in FIG. 531) is installed. The connecting member 530 and the lever 531 are connected to each other by a pin 533. The other end of the connecting member 530 is connected to the sub shaft 510. On the other hand, the lever 531 is free to rotate about the shaft 532.

When the first main switch 51 is opened, the operation rod 65 moves upward in FIG. 1 so that the first sub switch 53 is closed once, but at the same time, the lever 531 rotates counterclockwise. The pin 534 provided on the lever 531 and the hinge 66 is engaged to return the movable conductor 69 of the first sub-switch 53 back to the opening direction (downward direction). The elliptical shape of the hole through which the pin 66 penetrates in the hinge 66 is for enabling the movable conductor 68 to move in the opening direction (downward direction) irrespective of the position of the operation rod 65. to be. Reference numeral 70 denotes a spring for applying a contact force to the first sub-switch 53.

The connecting member 540 and the lever 541 are also provided on the second sub-switch 54 side as shown in FIG. When the second main switch 52 is opened, the lever 541 rotates clockwise about the shaft 542, and the pin 543 provided on the movable conductor 110 of the second sub-switch 54 and The lever 541 is engaged to move the movable conductor 544 in the open direction (downward direction). Reference numeral 71 denotes a spring for applying a contact force to the second sub-switch 54. The lengths of the connecting members 530 and 540 are variable, and the opening and closing timings of the main switch and the subswitch are adjusted by the member.

In FIG. 4, reference numeral 555 denotes a trip spring installed in the manipulator case 300 to interlock with the main shaft 500, reference numeral 590 denotes a condenser for supplying excitation energy to the coil 305, and reference numeral 591 denotes a control circuit of the electromagnet 301. Indicates.

In FIG. 1, between the hinge 66 of the operation rod 65 of the first main switch 51 and the upper end of the shaft 302 of the electromagnet 301, an electromagnetic repulsion coil 170 constituting an opening means and A release mechanism 900 for reducing the springing of the shaft on the movable electrode side, that is, the operating rod 65, generated when the first main switch 51 is opened at high speed by the reaction plate 171 is provided. .

The release mechanism 900 includes a pin support member 584 provided on the upper end of the shaft 302 of the electromagnet 301, a pin 583 provided by the pin support member 584, and an electromagnet 301 side. A lever 585 which rotatably supports one end around the shaft 582 and extends the other end to the main switch side through the lower side of the pin 583, and one end of the other end of the lever 585. This pin is connected, and the other end is comprised with the link mechanism which consists of the 2nd insulating rod 581 connected to the hinge 66 by the pin 580. As shown in FIG. The timing at which the lever 585 and the pin 583 are engaged is adjusted by adjusting the position of the pin support member 584 provided on the upper end of the shaft 302 of the electromagnet 301 (t3 shown in FIG. 5). ) Can be realized. Specifically, the twist depth of the pin support member 584 to the shaft 302 of the electromagnet 301 may be adjusted.

Next, operation | movement of one Embodiment of the current-type DC circuit breaker 5 which is the circuit breaker of this invention mentioned above is demonstrated.

In the closing operation, the coil 305 of the electromagnet 301 is excited to generate a suction force on the plunger 304. Since the suction force is transmitted to the operation rod 65 of the first main switch 51 and the operation rod 204 of the second main switch 52 via the main shaft 500 and the sub shafts 510 and 512, the suction force is movable. The conductors 62 and 200 are driven downward to close the first main switch 51 and the second main switch 52. In the closing operation, the contact springs 151 and 212 of the main switches 51 and 52 and the trip spring 555 installed in the manipulator case 300 are encapsulated so that the first main switch 51 and the second main switch 52 are reduced. ) To prepare for the opening operation.

The first sub-switch 53 is opened when the lever 531 and the pin 534 are engaged, while the second sub-switch 54 eliminates the engagement of the lever 541 and the pin 543. To a closed state. When the closing operation is completed, the excitation of the electromagnet 301 is released. Reaction forces of the contact pressure springs 151 and 212 and the tripping spring 555 are maintained by the suction force of the permanent magnet 306 inside the electromagnet 301.

In the normal opening operation of the first main switch 51 and the second main switch 52, the coil 305 is excited in the opposite direction to the above-mentioned closing operation. When the magnetic flux generated by the permanent magnet 306 is canceled by the reverse excitation of the coil 305, the suction force of the electromagnet 301 falls below the reaction force of the spring, and thus the first main switch 51 and the second main switch 52 The opening operation of

In the high-speed cutoff in the event of an accident, the electromagnetic repulsion coil 170 is excited. The operating rod 65 moves upward by bending the contact spring 151 by the electromagnetic repulsive force generated in the reaction plate 171, and the first main switch 51 is in the open state and the first sub-switch ( 53) is in the closed state. At this time, the main shaft 500 and the sub shaft 510 do not operate, and the states of the second main switch 52 and the second sub switch 54 remain unchanged.

When the operation rod 65 further moves upward by the electromagnetic repulsion force of the electromagnetic repulsion coil 170 of the reaction plate 171, the shaft 5 of the lever 585 and the electromagnet 301 of the release mechanism 900 ( The pins 583 provided on the 302 are engaged, and the electromagnetic repulsive force is transmitted to the pins 583. When the sum of the transmission force, the load of the contact springs 151 and 212 and the load of the trip spring 555 exceeds the suction force of the permanent magnet 306, the plunger 304 starts to move upward. According to this operation, the second main switch 52 and the second sub-switch are opened, and re-insertion thereof is prevented.

In the high-speed cut-off in the opening means, the force obtained by subtracting the reaction force of the contact springs 151 and 212 and the trip spring 555 from the suction force of the permanent magnet 306, that is, the electromagnetic repulsion force exceeding the surplus force for maintaining the closed state. It must act on the movable part of the electromagnet 301. If the electromagnetic repulsive force acts directly on the electromagnet movable portion as in the prior art, there is a risk that the contact is re-injected by the reaction force. In this embodiment, since the release mechanism 900 of the electromagnet 301 comprised of the insulating rod 581, the lever 585, and the pin 583 was provided, this release mechanism 900 uses the principle of a lever. The force required for release can be reduced to L1 / L2 times as shown in FIG. 1.

That is, the electromagnet 301 can be released with a slight operating force by the release mechanism 900. As a result, the reaction force at the time of release of the electromagnet 301 can be reduced, and the risk of reentering the main switch can be avoided. This release mechanism 900 also has a function of adjusting the operation timing of the second main switch 52 and the second sub-switch 54 at the time of high-speed interruption. The operation timing between the main switch and the sub-switch operated in consecutive holidays can be adjusted by the connecting members 530 and 540 shown in Figs. 1 and 2, but between the two switch groups, a separate manipulator is prepared to shift the timing. Complicated mechanisms, configurations, etc. are required. In the present embodiment, only the timing at which the shaft lever 582 and the pins 583 are engaged can be adjusted, which can be easily achieved.

According to the embodiment of the present invention described above, since the springing of the movable electrode side shaft generated during the current interruption by the electromagnetic repulsion mechanism can be reduced with a simple configuration, the enlargement of the operation mechanism of the vacuum valve can be suppressed. In addition, due to the spring of the movable electrode side shaft generated during the current interruption by the electromagnetic repulsion mechanism, the permanent magnet and the movable core in the operating mechanism of the vacuum valve are sucked, that is, the closed electrode of the vacuum valve can be released quickly with a slight force. Can provide a highly reliable circuit breaker.

8 to 11 show one embodiment of the three-phase high speed circuit breaker 600 which is the circuit breaker of the present invention, and FIG. 8 is a right side cross-sectional view of the three-phase high speed circuit breaker 600 which is the circuit breaker of the present invention, and FIG. 9 is a rear view. 10 is a front view, and all show closed state. 11 is a left side cross-sectional view showing a state immediately before the release of the electromagnet 301. In these drawings, the same parts as those of Figs. 1 to 4 are the same parts.

In these figures, the three-phase high-speed circuit breaker 600 has a vacuum conductor 601 having a vacuum-release valve 601 having a contact-free contact therein. And a fixed side feeder 603. On the other hand, the movable conductor 604 on the movable electrode side is disposed on the lower side via the current collector 605 and is connected to the movable side feeder 606.

The movable conductor 604 is connected to one end of the insulating rod 607. The other end of the insulating rod 607 is fixed to the operation rod 608. The operating rod 608 penetrates into the pin 609 which provided the contact surface flat-processed at the upper and lower parts. The pin 609 is engaged with one lever 503 of the single main shaft 500 in all three phases. The washer 611, the contact spring 612, and the washer 613 are held by the nut 610 fixed to the pin 609 and the operation rod 608. In the state where the vacuum valve 601 is opened, the hexagonal part 620 of the lower part of the operation rod 608 and the pin 609 are engaged by the contact spring 612. On the other hand, in the closing operation of the vacuum valve 601, the engagement between the pin 609 and the hexagonal portion 620 is released when the fixed contact 621 and the movable contact 622 of the vacuum valve 601 contacts. The load of the contact spring 612 becomes the contact force of the contact.

The operating rod 608 communicates with the electromagnetic repulsion coil 170 and the rebound plate 171 constituting the opening means. The electromagnetic repulsive force generated in the repellent plate 171 by the excitation of the electromagnetic repulsive coil 170 is configured to be received by the insulating rod 607 as in the above-described embodiment, and the operation rod 608 is Move downward

The operation rod 607 is driven by an electromagnet 301 provided in parallel to the vacuum valve 601 in the manipulator case 300. The shaft 302 of the electromagnet 301 is connected to the other lever 501 of the main shaft 500 via the member 303. That is, the suction force of the electromagnet 301 is transmitted to the operation rod 607 via the main shaft 500. In order to inject the vacuum valve 601, the coil 305 in the electromagnet 301 may be excited, and the plunger 304 may be driven downward in the drawing.

The release mechanism 900 of the electromagnet 301 is provided below the main shaft 500 and the levers 503 and 501. The release mechanism 900 of the electromagnet 301 has an interference lever 632 which can rotate about an axis 631, and an interference lever 632 so as to always rotate the interference lever 632 to the member 303 side. And a lever mechanism with a coil spring 633 (see FIG. 7) provided between the lever 501 and the lever 501. The shaft 631 in the release mechanism 900 is disposed on the electromagnet 301 side in order to effectively exhibit the principle of the lever. One end of the interference lever 632 is in contact with the member 303, and the other end of the interference lever 632 is located at the end of the hexagonal portion 620 under the operation rod 608.

Next, operation | movement of one Embodiment of the three-phase high speed circuit breaker 600 which is the circuit breaker of this invention mentioned above is demonstrated.

In the closing operation, the coil 305 of the electromagnet 301 is excited by the pre-charged capacitor 590 shown in FIG. 8 to generate a suction force to the plunger 304. The suction force is transmitted to the operation rod 607 via the main shaft 500, and the movable conductor 604 is driven upward to close the vacuum valve 601. Simultaneously with the closing operation, the contact spring 612 and the tripping spring 555 are accumulated and prepared for the opening operation. When the closing operation is completed, the excitation of the electromagnet 301 is released. Accumulated reaction force of the contact spring 612 and the trip spring 555 is maintained by the suction force of the permanent magnet 306 inside the electromagnet 301.

In the normal opening operation of the vacuum valve 601, the coil 305 is excited in the opposite direction as in the closing operation. The magnetic flux generated by the permanent magnet 306 is canceled by the reverse excitation of the coil 305, and the opening operation of the vacuum valve 601 is started when the suction force of the electromagnet 301 falls below the reaction force of the spring.

In the high-speed cutoff of the vacuum valve 601 at the time of an accident, the electromagnetic repulsion coil 170 of the opening means is excited. Since the operation rod 607 moves downward by further bending the contact spring 612 by the electromagnetic repulsion force generated in the reaction plate 171, the vacuum valve 601 is in an open state. At this time, the main shaft 500 is not moving yet.

As shown in FIG. 9, when the operating rod 607 moves downward by electromagnetic repulsion, the operating rod 607 and the interference lever 632 collide, and this collision force is transmitted to the member 303. As shown in FIG. When the sum of the transmission force and the load of the contact spring 612 and the trip spring 555 exceeds the suction force of the permanent magnet 306, the plunger 304 starts to move upward. In accordance with this operation, the entire operating mechanism of the high speed circuit breaker 600 shifts to the open state.

In the high-speed cutoff of the vacuum valve 601 by the opening means, the force obtained by subtracting the reaction force of the contact spring 612 and the trip spring 555 from the suction force of the permanent magnet 306, that is, the closed electrode state of the vacuum valve 601 is determined. The electromagnetic repulsive force exceeding the surplus force to maintain must act on the movable part of the electromagnet 301. If the electromagnetic repulsive force acts directly on the electromagnet movable portion as in the prior art, there is a risk that the contact is re-injected by the reaction force. In this embodiment, the release mechanism 900 of the electromagnet 301 comprised by the shaft 631 and the interference lever 632 is eliminated. As shown in Fig. 9, the release mechanism 900 can reduce the force required for the release of the electromagnet movable portion by L1 / L2 times by utilizing the principle of the lever. That is, the electromagnet 301 can be released by a slight force in the release mechanism 900, and as a result, the reaction force at the time of release of the electromagnet movable portion is reduced, and the risk of re-injection of the vacuum valve 601 can be avoided. .

In addition, in this embodiment, the electromagnet for switching a load and the electromagnet for high-speed cutoff of a fault current are set separately. The impact force of the electromagnetic repulsive force in the high-speed cutoff is large, and the strength improvement of each member is essential to cope with multiple frequency opening and closing. The increase in strength leads to an increase in the mass of the moving part, resulting in a vicious cycle of further strengthening the electron repelling force for high speed opening and closing. When the high-speed interruption is limited to the fault current interruption, durability of several to several tens of times can be ensured, and the above-described problems can be solved. In addition, in the electromagnet described in this embodiment, the opening operation of the vacuum valve 601 can be performed by exciting in the opposite direction to the closing operation. Therefore, even if all the magnets used in the load current interruption and fault current interruption are changed, the control method There is no change in the components just by changing the.

According to this embodiment, similarly to the above-described embodiment, since the springing of the movable electrode side shaft generated during the current interruption by the electromagnetic repulsion mechanism can be reduced with a simple configuration, the enlargement of the operation mechanism of the vacuum valve can be suppressed. In addition, due to springing of the movable electrode side shaft generated during the current interruption by the electromagnetic repulsion mechanism, suction of the permanent magnet and the moving core from the operating mechanism of the vacuum valve, that is, quickly releases the closed electrode of the vacuum valve with a slight force. It is possible to provide a circuit breaker with high reliability.

FIG. 12 is a left side view showing another embodiment of the current-type DC circuit breaker serving as the circuit breaker of the present invention, and since the same reference numerals as those in FIG.

This embodiment arrange | positions another lever 1000 in the lever 513 located in the right middle part of FIG. The lever 1000 is positioned on the member 1001 side of which the one side is provided on the operation rod 65, and the lever 1000 is positioned on the lever 513 by the shaft 1002 so that the other side is located on the insulating rod 502 side. It is installed so that rotation is possible. For this reason, at the time of the high speed blocking by the upward movement of the reaction plate 171 in the opening means, the member 1001 is moved to the upper side of the operating rod 65 so that one side of the lever 1000 is moved at the position P. FIG. It abuts and rotates the lever 1000 counterclockwise with the shaft 1002 as a support point. The other side of the lever 1000 collides with the insulating rod 502 at the position Q by the counterclockwise rotation of the lever 1000. As a result, the insulating rod 503 moves downward, and the lever 501 on the electromagnet side rotates clockwise to release the electromagnet 301. As a result, the reaction force at the time of release of the electromagnet 301 can be reduced, and the risk of reentering the main switch can be avoided.

In this embodiment as well as the above-described embodiment, since the springing of the movable electrode-side shaft generated during the current interruption by the electromagnetic repulsion mechanism can be reduced with a simple configuration, the enlargement of the operation mechanism of the vacuum valve can be suppressed. In addition, due to the spring of the movable electrode-side shaft generated during the current interruption by the electromagnetic repulsion mechanism, the permanent magnet and the movable core of the vacuum valve operating mechanism can be quickly released, that is, the closed electrode of the vacuum valve can be quickly released with a slight force. Therefore, it is possible to provide a circuit breaker with high reliability.

1 is a left side view of an embodiment of a current-type DC circuit breaker which is a circuit breaker of the present invention;

FIG. 2 is a rear view of an embodiment of a current-type DC circuit breaker which is a circuit breaker of the present invention shown in FIG.

3 is a right side view of an embodiment of a current-type DC circuit breaker which is a circuit breaker of the present invention shown in FIG.

4 is a front view of an embodiment of a current-type DC circuit breaker which is a circuit breaker of the present invention shown in FIG.

5 is a system circuit diagram to which an embodiment of the current-type DC circuit breaker serving as the circuit breaker of the present invention shown in FIG. 1 is applied;

FIG. 6 is a time chart diagram showing operation during an accident of an embodiment of the current-type DC circuit breaker which is the circuit breaker of the present invention shown in FIG. 1;

7 is a time chart diagram showing operation during normal operation of one embodiment of the current-type DC circuit breaker which is the circuit breaker of the present invention shown in FIG. 1;

8 is a right side cross-sectional view of a three-phase high speed circuit breaker which is a circuit breaker of the present invention;

9 is a rear view of a three-phase high speed circuit breaker which is a circuit breaker of the present invention shown in FIG. 8;

10 is a front view of a three-phase high speed circuit breaker which is a circuit breaker of the present invention shown in FIG. 8;

11 is a left side cross-sectional view of a three-phase high speed circuit breaker which is a circuit breaker of the present invention shown in FIG. 8;

12 is a left side view of another embodiment of a current-type DC circuit breaker which is a circuit breaker of the present invention.

※ Explanation of code for main part of drawing

5: Current DC Circuit Breaker 51: 1st Main Switch (Vacuum Valve)

170: electromagnetic rebound coil 171: rebound plate

301: electromagnet 306: permanent magnet

600: high speed breaker 900: release mechanism

Claims (7)

In the circuit breaker provided with the vacuum valve, the operation mechanism which maintains the said vacuum valve in the closed state by the suction force of a permanent magnet, and the opening means which drives the operation shaft of the said operation mechanism to an open direction by the electromagnetic repulsion action, And a mechanism for canceling the closed electrode state of the vacuum valve by the operating mechanism in response to the opening operation by the opening means between the opening means and the operation mechanism. In the circuit breaker provided with the vacuum valve and the opening means for driving the operation shaft of the vacuum valve in the opening direction by the electromagnetic repulsion action, It has an electromagnet composed of a coil, a moving core, and a permanent magnet, excites the coil to perform the closing operation of the vacuum valve, and maintains the closed state of the vacuum valve by the suction force of the permanent magnet. A release mechanism comprising an operation mechanism for exciting the coil in the direction to open the vacuum valve, and a link mechanism connected to the operation mechanism in response to the opening operation by the opening means to release the closed state of the vacuum valve. Breaker, characterized in that provided. In the circuit breaker provided with the vacuum valve and the opening means for driving the operation shaft of the vacuum valve in the opening direction by the electromagnetic repulsion action, It has an electromagnet composed of a coil, a moving core, and a permanent magnet, excites the coil to perform the closing operation of the vacuum valve, and maintains the closed state of the vacuum valve by the suction force of the permanent magnet. A release mechanism comprising an operation mechanism for exciting the coil in the direction to open the vacuum valve, and a lever mechanism connected to the operation mechanism in response to the opening operation by the opening means to release the closed electrode state of the vacuum valve. Breaker, characterized in that provided. In a circuit breaker having two switch groups consisting of a main switch and a sub-switch operating in conjunction with it, One switch group is provided with opening means for driving the operation shaft in the opening direction by an electromagnetic repulsion action, and an electromagnet composed of a coil, a moving core and a permanent magnet, and exciting the coil with respect to the two switch groups. An operation mechanism which maintains the closed pole state by the suction force of the permanent magnet, excites the coil in the opposite direction to the closing operation, and performs the opening action; and responds to the opening action by the opening means. And a release mechanism comprising a link mechanism connected to the operation mechanism to release the closed state. In a circuit breaker having two switch groups consisting of a main switch and a sub-switch operating in conjunction with it, One switch group is provided with opening means for driving the operation shaft in the opening direction by an electromagnetic repulsion action, and an electromagnet composed of a coil, a moving core and a permanent magnet, and exciting the coil with respect to the two switch groups. An operation mechanism which maintains the closed pole state by the suction force of the permanent magnet, excites the coil in the opposite direction to the closing operation, and performs the opening action; and responds to the opening action by the opening means. And a release mechanism comprising a lever mechanism connected to the operation mechanism to release the closed pole state. The method according to any one of claims 1 to 5, The electromagnet is provided with the opening means and the operation mechanism in parallel. The method according to any one of claims 4 to 6, And said adjusting mechanism is provided in said release mechanism for adjusting the operation timing of the two switch groups to be opened by the electromagnetic repulsive action by said closed electrode means.

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