JP2005050737A - Current limiting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To limit excessive AC current flowing by a short circuit accident or so in an AC carrying way. <P>SOLUTION: A serial circuit of a superconductor and a current interrupting element is inserted in the AC carrying way and a current limiting fixed coil is connected in parallel with the serial circuit. A movable conductor is coupled to a movable contactor of the above current interrupting element. A movable conductor plate which excites an eddy current by a magnetic line of force from the outside and based on that generates a magnetic line of force is fitted to the movable conductor so that the magnetic line of force from the outside is made a magnetic line of force generated by the current limiting fixed coil, and the magnetic line of force generated based on the eddy current may become a magnetic line of force that repulses the magnetic line of force generated by the current limiting fixed coil, and thereby the movable conductor is fitted so that the movable contactor of the current interrupting element may be operated to the state of non-contact to the fixed contactor. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a current limiter that restricts an excessive alternating current from flowing due to a short circuit accident or the like to an alternating current conducting path connecting various electric or electronic devices in an alternating current transmission and distribution system.

2. Description of the Related Art Conventionally, a current limiter having a configuration in which a superconductor is inserted in an AC current path connecting various electric or electronic devices in an AC transmission / distribution system or the like has been proposed.
According to such a conventional current limiter, when an excessive AC current does not flow due to a short circuit accident or the like in the AC current path, a normal AC current is passed through the AC current path via the superconductor. . In this case, the superconductor is in a superconducting state. Therefore, in this case, a constant alternating current can be allowed to flow through the alternating current path without being substantially limited by the superconductor.

  In addition, if an excessive alternating current flows in the AC current path due to a short circuit accident or the like from such a state, the excessive alternating current flows to the superconductor, so that the superconductor is moved from the superconducting state to the non-superconducting state. The state is switched to the conductive state (high resistance state), and therefore, even if an alternating current with an excessive AC current limited is passed through the AC current path, the current flowing through the AC current path is restricted from flowing. become.

  In this case, it is assumed that the superconductor is switched from the superconducting state to the non-superconducting state (high resistance state) when an excessive alternating current flows through the superconductor. Is called.

  From the above, according to the above-described conventional current limiter, a normal AC current is always supplied to the AC current path, but even if an excessive AC current flows to the AC current path due to a short circuit accident or the like. , To quickly limit the flow of excessive AC current to the AC current path, and to ensure that accidents, failures, etc. occur in various electrical or electronic equipment connected to the AC current path, Can be avoided.

  In the case of the above-described conventional current limiter, as is apparent from the above description, when an excessive alternating current flows through the AC current path due to a short circuit accident or the like, the excessive alternating current flows to the superconductor. Therefore, even if the superconductor changes from a superconducting state to a non-superconducting state (high resistance state), and an alternating current in which an excessive alternating current is limited flows through the alternating current passage, the alternating current passage However, in this case, since the alternating current with the excessive alternating current flowing is flowing through the superconductor, the alternating current causes the superconductor to flow. There was a risk of heat generation and damage to the superconductor.

  For this reason, the short circuit accident that caused the excessive AC current to flow in the AC current path after the state that the excessive AC current is restricted to flow in the AC current path has been resolved. There is a risk that even if an attempt is made to return to a state in which an alternating current is constantly flowing through the superconductor through the AC current path, it cannot be performed unless the superconductor is replaced with a new superconductor. Had.

  Therefore, the present invention proposes a novel current limiting device that does not have the above-described fear.

  In the current limiter according to the first invention of this application, (1) a series circuit of a superconductor, a current contact element having a stationary contact and a movable contact with respect to the superconductor is inserted in an AC current path, (2 ) A current-limiting fixed coil is connected in parallel with the series circuit, (3) a movable conductor is coupled to the movable contact of the current interrupting element, and (4) the movable conductor is connected to the movable conductor. The movable contact of the current interrupting element is in contact with the fixed contact of the current interrupting element, the first position in the movable direction of the movable conductor, and the movable contact of the current interrupting element of the current interrupting element is Position holding means for selectively holding the movable conductor at a second position in the movable direction that is not in contact with the fixed contact is provided, and (5) eddy current is induced in the movable conductor by external magnetic lines of force. And a movable guide that generates magnetic field lines based on it. The plate uses the external magnetic field lines as magnetic lines generated when it is energized from the current limiting fixed coil, and the magnetic field lines generated based on the eddy current are generated when it is energized from the current limiting fixed coil. So that the movable conductor is repelled by the magnetic field lines and the second conductor held by the position holding means from the first position held by the position holding means. Positioned and mounted to operate in position.

  In this case, the fixed coil for current limiting is wound so as to constitute a cylindrical body, and the movable conductor plate has an inner diameter and an outer diameter approximately equal to the inner diameter and the outer diameter of the cylindrical body formed by the fixed current limiting coil, respectively. It is possible that the annular movable conductor plate has a diameter, and the annular movable conductor plate is disposed concentrically in close proximity to one end face of the cylindrical body constituting the current limiting fixed coil. And

  The current limiter according to the second invention of the present application is (1) a series circuit of a superconductor, a current contact element having a stationary contact and a movable contact with respect to the superconductor is inserted in the AC current path, (2) A series circuit of a current limiting fixed coil and a movable coil is connected in parallel with the series circuit, (3) a movable conductor is connected to the movable contact of the current interrupting element, and (4) the movable conductor. In relation to the movable conductor, the movable contact of the current interrupting element is in contact with the fixed contact of the current interrupting element. Position holding means for selectively holding the movable contact with the second position in the movable direction of the movable conductor that is not in contact with the fixed contact of the current interrupting element is provided, (5) The moving coil will then be energized. And the movable conductor is held by the position holding means so that the line of magnetic force generated from the current-limiting fixed coil is repelled by the line of magnetic force generated when it is energized. It is positioned and attached so as to operate from the first position to the second position held by the position holding means.

  In this case, the fixed coil for current limiting and the movable coil are wound so as to constitute cylindrical bodies having substantially the same inner diameter and outer diameter, respectively, and the cylindrical body constituting the movable coil is It is allowed to be arranged concentrically in close proximity to one end face of the cylindrical body constituting the fixed coil.

  According to the current limiter according to the first invention of the present application, a series circuit of a superconductor and a current interrupting element is configured at all times when an excessive AC current does not flow through an AC current path due to a short circuit accident or the like. The movable conductor connected to the movable contact of the current interrupting element constitutes a series circuit of the superconductor and the current interrupting element by the position holding means, and the movable contact of the current interrupting element is a fixed contact with the movable conductor By holding the movable conductor in contact with the first position in the movable direction, a normal alternating current is caused to flow through the alternating current path through the series circuit of the superconductor and the current interrupting element. In this case, the superconductor constituting the series circuit of the superconductor and the current interrupting element is in the superconducting state, and the current interrupting element of course does not limit the flow of current through it. Therefore, in this case, a constant alternating current can be passed through the alternating current energizing path without being substantially limited by the series circuit of the superconductor and the current interrupting element.

  In addition, if an excessive AC current flows in such a state due to a short circuit accident or the like in the AC current path, the excessive AC current flows in the series circuit of the superconductor and the current interrupting element, so that the series circuit As a result, the superconductor is switched from the superconducting state to the non-superconducting state (high resistance state). For this reason, it is assumed that an alternating current with an excessively large alternating current flows through the alternating current path via the fixed coil for current limiting. However, it will be in the state which restrict | limits that an excessive alternating current flows into an alternating current conduction path.

  In this case, when the superconductor constituting the series circuit of the superconductor and the current interrupting element is switched from the superconducting state to the non-superconducting state (high resistance state) due to excessive alternating current flowing therethrough. The conversion is performed at high speed due to the characteristics of the superconductor.

  Further, in this case, since an alternating current with an excessive alternating current flows through the fixed current limiting coil, a magnetic force line is generated from the fixed current limiting coil, and an eddy current is induced in the movable conductor plate by the magnetic force line. Based on this, a line of magnetic force that repels the line of magnetic force generated from the fixed coil for current limiting is generated from the movable conductor plate, thereby operating the movable conductor plate, and thus the movable conductor is held by the position holding means. From the above-mentioned first position to the above-mentioned second position held by the position holding means, so that any current through the series circuit of the superconductor and the current interrupting element in the AC current path No longer flows.

  From the above, according to the current limiter according to the first invention of the present application, the normal AC current is always supplied to the AC current path, but an excessive AC current flows to the AC current path due to a short circuit accident or the like. Even so, it is effective to quickly limit the flow of the excessive AC current to the AC current path and cause accidents, failures, etc. in various electrical or electronic devices connected to the AC current path. It can be surely protected.

  Further, according to the current limiter according to the first invention of the present application, as is apparent from the above, when an excessive AC current flows through the AC current path due to a short circuit accident or the like, the current limiter is limited to the AC current path. Even if an alternating current with an excessive AC current limited is passed through the diverted fixed coil, the AC current path is restricted from flowing an excessive AC current. Therefore, no current flows through the series circuit of the superconductor and the current interrupting element, and therefore no current flows in the superconductor constituting the series circuit of the superconductor and the current interrupting element. Therefore, there is no fear that the superconductor will generate heat and the superconductor will be damaged.

  In addition, for this reason, since the situation where the excessive AC current flows in the AC current path is restricted, the short-circuit accident that caused the excessive AC current to flow in the AC current path has been resolved. Superconductivity that constitutes a series circuit of a superconductor and a current interrupting element can be restored to a state in which an alternating current is constantly flowing through the series circuit of the superconductor and the current interrupting element in the current path. Even if the body is not replaced with a new superconductor, it has an excellent effect that it can be easily performed.

  Further, according to the current limiting device according to the second invention of the present application, as in the case of the current limiting device according to the first invention of the present application, for the same reason, a normal alternating current is superconducted in the AC current path. It can flow without being substantially limited by the series circuit of the body and the current interrupting element.

  In addition, if an excessive alternating current flows through the AC current path due to a short circuit accident or the like from such a state, the excessive alternating current is superconductor in accordance with the current limiting device according to the first invention of the present application. Flows through a series circuit of a current interrupting element and the superconductor of the series circuit changes from a superconducting state to a non-superconducting state (high resistance state). Even if an alternating current with an excessive alternating current limited is passed through a series circuit of the moving coil and the movable coil, the state is that the excessive alternating current is restricted to flow through the alternating current path, and in this case, The superconductor that constitutes the series circuit of the superconductor and the current interrupting device is switched from the superconducting state to the non-superconducting state (high resistance state) due to the excessive alternating current flowing therethrough. Superconductivity The characteristics, carried out at high speed.

  Further, in this case, since an alternating current with an excessive AC current is limited to flow in a series circuit of the current limiting fixed coil and the movable coil, a magnetic field line is generated from the current limiting fixed coil toward the movable coil, A line of magnetic force that repels the line of magnetic force generated from the fixed coil for current limiting and that moves from the moving coil toward the fixed coil for current limiting is generated, and thereby the movable coil is mechanically operated, so that the movable conductor holds the position. Since the first position held by the means is moved to the second position mentioned above, which is held by the position holding means, a series circuit of a superconductor and a current interrupting element is connected to the AC current path. No current will flow.

  From the above, in the case of the current limiter according to the second invention of the present application as well, as in the case of the current limiter according to the first invention of the present application, the normal AC current always flows through the AC current path. Even if an excessive AC current flows through the AC current path due to a short-circuit accident, etc., various electric or electronic devices connected to the AC current path are quickly restricted so that the excessive AC current flows to the AC current path. It is possible to effectively and reliably protect against accidents, breakdowns, etc. occurring.

  Further, according to the current limiter according to the second invention of the present application, as apparent from the above, when an excessive alternating current flows in the AC energizing path due to a short circuit accident or the like, According to the case of the current limiter according to the invention, even if an alternating current with an excessive alternating current being passed through the series circuit of the fixed current limiting coil and the movable coil is passed through the alternating current carrying path, the alternating current carrying path is excessive. In this case, as in the case of the current limiter according to the first invention of the present application, a series of a superconductor and a current interrupting element is provided in the AC current path. No current flows through the circuit, and therefore no current flows in the superconductor that forms the series circuit of the superconductor and the current interrupting element, so that heat is generated in the superconductor. Damage to its superconductor Or occur, any does not have a fear that.

  For this reason, as in the case of the current limiter according to the first invention of the present application, after the state where the excessive AC current is restricted from flowing through the AC current path, the excessive AC current is By eliminating the short-circuit accident that caused the current to flow, it is possible to return to a state in which an alternating current is constantly flowing through the series circuit of the superconductor and the current interrupting element in the AC current path. Even if it does not replace the superconductor which comprises the series circuit of a body and a current interruption element with a new superconductor, it has the outstanding effect that it can do easily.

  A superconductor, a current interrupting element, a current-limiting fixed coil, a movable conductor, a position holding means, and a movable conductor plate or a movable coil are used.

  A first embodiment of a current limiting device according to the present invention will now be described with reference to FIGS.

  In the first embodiment of the current limiter according to the present invention, as shown in FIG. 1, an alternating current in a superconducting state is connected to an alternating current path 1 connecting various electric or electronic devices in an alternating current transmission and distribution system. A known superconductor 2 that changes to a non-superconducting state (high resistance state) when the alternating current becomes an excessive alternating current from the state of flowing current, a fixed contact 3a and a movable contact 3b corresponding thereto It has an electrical configuration in which a series circuit 4 with a current interrupting element 3 having a gap is inserted.

In this case, as shown in FIG. 2, the current interrupting element 3 includes a fixed contact 3a and a movable contact 3b in a cylindrical vacuum vessel 5, for example, and a fixed conductor 6 is mounted on the fixed contact 3a. The fixed conductor 6 is connected to the upper portion of the vacuum vessel 5 so as to pass through the upper wall of the vacuum vessel 5 in an airtight manner, and is fixed to the upper wall at the penetrating position. The movable conductor 7 is connected to the vacuum vessel 8, and the movable conductor 7 is extended outside the vacuum vessel 5 so that the lower wall of the vacuum vessel 5 is kept airtight and vertically movable. Can be
In the following description, it is assumed that the current interrupting element 3 is such a vacuum valve 8.

  Further, in the first embodiment of the current limiter according to the present invention, as shown in FIG. 2, the movable conductor 7 of the vacuum valve 8 described above is moved from a second position held by a position holding means 40 described later. It has a drive unit 11 having a drive unit main body 9 that drives to a first position held by a position holding unit 40 to be described later, and a housing 10 that houses the drive unit main body 9.

In this case, the driving device main body 9 of the driving device 11 is connected to the driving device main body power supply 13 when the operation switch 12 arranged outside the housing 10 is turned on, that is, attached. As a result, the operating rod 14 that extends upwardly and is movable in the vertical direction is operated upwardly outward from the housing 10, and then from that state, When the operation switch 12 returns to the off state or is operated to the off state, the operation switch 12 is not connected to the power source 13 for the driving apparatus main body and is not energized, that is, the non-energized state. Can be constituted by a known electromagnetic plunger 15 which is configured to be able to return to the state before the operation.
In the following description, it is assumed that the drive device main body 9 of the drive device 11 is composed of such an electromagnetic plunger 15.

  Further, in the first embodiment of the current limiting device according to the present invention, as shown in FIG. 2, a plurality of insulating columns 16 having an outer periphery screwed are planted on the housing 10 of the driving device 11, Insulating plates 17 are bridged between the insulating columns 16 at their upper positions, and the insulating plates 17 are bridged in such a state that the insulating plates 17 are screwed onto the screws attached to the insulating columns 16. The vacuum valve 8 as the current interrupting element 3 described above is attached to the insulating plate 17 by the screw 18, and the free end of the fixed conductor 6 extending outward from the bolt 18 is attached to the insulating plate 17. By being fixedly attached to the lower side of the insulating plate 17 by using, it is fixedly attached to the state suspended from the lower side of the insulating plate 17, and the vacuum valve 8 is fixed in that state. Superconductivity inserted in the AC current path 1 on the conductor 6 One end of the body 2 is connected.

  Further, as described above, the movable conductor 7 extending downwardly from the vacuum valve 8 as the current interrupting element 3 fixedly attached to the insulating plate 17 is driven at the free end of the driving device 11 described above. An electromagnetic plunger 15 as the apparatus main body 9 is connected to an operating rod 14 that extends upward outside the housing 10 and is movable in the vertical direction.

  Further, an annular conductor plate 22 projecting the sliding contact 21 from the inner peripheral surface between the plurality of insulating pillars 16 planted on the housing 10 at the lower position thereof, Bridges are made in sliding contact with the movable conductor 7, and the annular conductor plate 22 is used in such a state that it is bridged in such a manner that the insulating pillar 16 is screwed into a screw attached thereto. The lead wire 34 inserted into the AC conducting path 1 is led out from the annular conductor plate 22 so that the superconductor 2 and the current interrupting element 3 (vacuum valve 8) are connected. The series circuit 4 is led out from the end A of the superconductor 2 inserted in the AC conducting path 1 on the side opposite to the side connected to the fixed conductor 6 of the vacuum valve 8 and the annular conductor plate 22. It is comprised between the leader line 34 currently made.

  Further, in the first embodiment of the current limiting device according to the present invention, as shown in FIG. 1, the current limiting fixing is performed in parallel with the series circuit 4 of the superconductor 2 and the current interrupting element 3 (vacuum valve 8). It has an electrical configuration to which the coil 30 is connected.

In this case, the current-limiting fixed coil 30 is wound and arranged on the insulating cylinder 33 described below so as to form a cylindrical body.
That is, as shown in FIG. 2, while the plurality of insulating pillars 16 are extended, the insulating ring plate 31 is attached to the insulating plate 17 as described above. It was bridged so as to surround the vacuum valve 8 as the element 3 and to be concentric with the movable conductor 7 extending downward from the vacuum valve 8, and the insulating ring plate 31 was bridged as such. In this state, the insulating pillar 16 is fixedly attached to the insulating pillar 16 by using a mother screw 32 that engages with a screw attached thereto, and the inner diameter of the insulating annular plate 31 is attached to the insulating annular plate 31 from its lower surface side. An insulating cylinder 33 having an inner diameter approximately equal to that is fixedly attached by using a bolt 35 so as to surround the vacuum valve 8 and to be concentric with the movable conductor 7, and on the insulating cylinder 33. The current-limiting fixed coil 30 is a cylinder. Are arranged is wound so as to constitute a.

  Further, the fixed conductor of the superconductor 2 in which one end of the current-limiting fixed coil 30 wound and arranged so as to form a cylindrical body on the insulating cylinder 33 is inserted in the AC current path 1. An annular conductor plate that is connected to an end A opposite to the side connected to 6 and has the other end protruding the sliding contact 21 that is in sliding contact with the movable conductor 7 from the inner peripheral surface described above. 22, and therefore, the current-limiting fixed coil 30 is composed of the above-described end A and the above-described lead wire 34 constituting the series circuit 4 of the superconductor 2 and the current interrupting element 3 (vacuum valve 8). In between, it is connected in parallel with the series circuit 4 of the superconductor 2 and the current interrupting element 3 (vacuum valve 8).

  Furthermore, in the first embodiment of the current limiting device according to the present invention, as shown in FIG. 2, in relation to the movable conductor 7 extending downward from the vacuum valve 8 as the current interrupting element 3 described above. The movable conductor 3 b (movable contact 3 b of the current interrupting element 3) housed in the vacuum vessel 5 of the vacuum valve 8 is fixed in the vacuum vessel 5 of the vacuum valve 8. The first position in the movable direction of the movable conductor 7 in contact with the contact 3a (the fixed contact 3a of the current interrupting element 3), and the movable contact 3b built in the vacuum vessel 5 of the vacuum valve 8. (The movable contact 3 b of the current interrupting element 3) of the movable conductor 7 not in contact with the fixed contact 3 a (the fixed contact 3 a of the current interrupting element 3) housed in the vacuum vessel 5 of the vacuum valve 8. Selectively held in the second position in the moving direction Position retaining means 40 is provided that.

  In this case, the position holding means 40 (a) the movable conductor 7 at a position below the position where the above-described annular conductor plate 22 is disposed on the movable conductor 7 extending downward from the vacuum valve 8. A disc body 43 having an annular engaging groove 42 drilled from the outer peripheral surface thereof, which is fixedly mounted concentrically with the movable conductor 7 by using a mother screw 41 which is screwed into a screw attached in advance. (B) It was fixedly attached to the above-described annular conductor plate 22 using bolts 44 so as to surround the disk body 43 and to be concentric with the movable conductor 7 on the lower surface side thereof. A cylindrical body 46 in which an annular engagement groove 45 is formed from the inner peripheral surface, and (c) an outer edge portion and an inner edge portion viewed from above or below between the disk body 43 and the cylindrical body 46. 43 is engaged with the engaging groove 42 of the cylinder 43 and the engaging groove 45 of the cylindrical body 46 to be bridged. (D) the elastic plate 48 extends in a truncated cone shape between the disc body 43 and the cylindrical body 46, and the disc body 43, and thus the movable conductor. 7 is pushed upward so that the movable conductor 7 is brought into contact with the fixed contact 3a of the vacuum valve 8 (current interrupting element 3) by the movable contact 3b of the vacuum valve 8 (current interrupting element 3). (E) the bullet plate 48 extends in a reverse truncated conical shape between the disc body 43 and the cylindrical body 46, and the disc body 43, and accordingly By moving the movable conductor 7 downward, the movable conductor 7 is in contact with the fixed contact 3a of the vacuum valve 8 (current cutoff element 3) by the movable contact 3b of the vacuum valve 8 (current cutoff element 3). The movable plate 7 is held in the second position, and (f) the bullet plate 48 extends in the shape of a reverse truncated cone to move the movable plate 7. While being held at the second position, the electromagnetic plunger 15 as the drive device main body 9 of the drive device 11 described above is biased as described above, whereby the operating rod 14 is moved to the movable conductor 7 and the board body. If the plate body 43 is operated upward, the inner edge portion of the bullet plate 48 is pushed upward by the operation of the disc body 43, so that the bullet plate 48 extends into a truncated conical cylinder shape and is movable. The state in which the conductor 7 is held in the second position is changed to the state in which the conductor 7 is held in the first position, and (g) the bullet plate 48 extends into a truncated conical cylinder shape, If the movable conductor 7 is operated downward along with the disc body 43 while the movable conductor 7 is held at the first position, the inner edge of the bullet plate 48 is lowered by the operation of the disc body 43. When pressed down, the bullet plate 48 expands into a truncated conical cylinder shape and is allowed. The moving conductor 7 is configured to change from a state where it is held at the first position to a state where it is held at the second position.

  Further, in the first embodiment of the current limiting device according to the present invention, as shown in FIG. 2, the above-described fixed current limiting coil 30 is arranged on the movable conductor 7 extending downward from the vacuum valve 8. An annular movable conductor plate 50 that induces an eddy current by a magnetic line of force from the outside and generates a magnetic line based on the magnetic field line between the position where the ring-shaped conductive plate 22 is disposed and the position where the annular conductor plate 22 is disposed One end face (in the case of illustration, the bottom surface of the cylindrical body, in which the fixed coil 30 for current limiting is constituted by the movable conductor plate 50 so that the insulated annular plate 51 fixedly mounted is concentric with the movable conductor 7. And fixedly attached to the movable conductor 7 using a mother screw 52 that is screwed in advance with a screw previously attached to the movable conductor 7 so as to be concentrically close to and faced to the side end surface). Magnetic field lines from the current limiting fixed coil 30 The magnetic field lines generated by energization are generated, and the magnetic field lines generated based on the eddy current described above are made to repel the magnetic field lines generated by energizing the current limiting fixed coil 30. Thereby, the movable conductor 7 is held by the position holding means 40 described above, and the movable contact 3b of the vacuum valve 8 is in contact with the fixed contact 3a with respect to the movable conductor 7 in the movable direction. From the first position, the movable contact 3b of the vacuum valve 8 held by the position holding means 40 described above is operated to the second position in the movable direction where the movable contact 3b is not in contact with the fixed contact 3a. Are fixedly mounted.

  In this case, the movable conductor plate 50 is made of copper, aluminum, or the like, and can have an inner diameter and an outer diameter substantially equal to the inner diameter and the outer diameter of the cylindrical body formed by the current-limiting fixed coil 30.

The above is the configuration of the first embodiment of the current limiter according to the present invention.
According to the first embodiment of the current limiting device of the present invention having such a configuration, the electromagnetic plunger 15 as the driving device body 9 of the driving device 11 is not attached to the electromagnetic plunger 15 at all times. In a state of being energized, the position holding means 40 causes the movable conductor 7 to contact the movable contact 3b of the vacuum valve 8 (current interruption element 3) and the fixed contact 3a of the vacuum valve (current interruption element 3). The first position can be held.

  Therefore, the series circuit of the superconductor 2 and the current interrupting element 3 (vacuum valve 8) is always connected to the AC energizing path 1 connecting various electric or electronic devices without the current-limiting fixed coil 30. Through 4, it is possible to obtain a state in which a constant alternating current is flowing.

  However, if an excessive alternating current flows through the AC current path 1 from such a state due to a short circuit accident or the like, the series circuit 4 of the superconductor 2 and the current interrupting element 3 (vacuum valve 8), and therefore Then, an excessive alternating current flows through the superconductor 2, and therefore the superconductor 2 is switched from a superconducting state to a non-superconducting state (high resistance state). 30, that is, the current-limiting fixed coil 30 is energized, thereby generating magnetic lines of force from the current-limiting fixed coil 30 to the movable conductor plate 50, so that eddy current is generated in the movable conductor plate 50. Based on this, a line of magnetic force that repels the line of magnetic force from the current limiting fixed coil 30 toward the movable conductor plate 50 is generated on the movable conductor plate 50.

  For this reason, the movable conductor plate 50 is actuated downward together with the movable conductor 7 and the plate body 43 of the position holding means 40, and the inner edge of the bullet plate 48 of the position holding means 40 is pushed downward. Thus, the movable contact 3b of the vacuum valve 8 (current interrupting element 3), in which the movable conductor 7 has been held by the position holding means 40, is in contact with the fixed contact 3a of the vacuum valve 8 (current interrupting element 3). The movable contact 3b of the vacuum valve 8 (current interruption element 3) held by the position holding means 40 comes into contact with the fixed contact 3a of the vacuum valve 8 (current interruption element 3) from the first position. Therefore, the current that has been flowing through the series circuit 4 of the superconductor 2 and the current interrupting element 3 (vacuum valve 8) until now stops flowing at all. Current-limiting stationary coil 3 Through the body, so that the limited alternating current of an excessive alternating current flows.

  Therefore, if an excessive AC current flows in the AC current path 1 due to a short circuit accident or the like, even if an AC current with an excessive AC current limited is supplied to the AC current path 1, no excessive AC current is supplied. It is possible to avoid an accident or failure in various electric or electronic devices connected to the AC energizing path 1.

  It should be noted that the short circuit accident that caused the excessive AC current to flow in the AC current path 1 after the AC current in which the excessive AC current is limited to flow in the AC current path 1 is eliminated. For example, an alternating current in which the alternating current is always limited flows through the AC current path 1 through the fixed coil 30 for current limiting. Therefore, an alternating current in which an excessive alternating current is limited is supplied to the AC current path 1. After the short-circuit accident that caused the excessive AC current to flow through the AC current path 1 after the state of current flow has been resolved, the normal AC current can be returned to the AC current path 1 and returned. become unable.

  However, if the electromagnetic plunger 15 as the drive device main body 9 of the drive device 11 is energized from such a state, the operating rod 14 becomes the movable conductor 7, the plate body 43 of the position holding means 40, and the movable conductor plate. 50 is actuated upward with 50, and the inner edge of the bullet plate 48 of the position holding means 40 is pushed upward, whereby the movable conductor 7 is held by the position holding means 40 until now. The vacuum held by the position holding means 40 from the second position where the movable contact 3b of the valve 8 (current interrupting element 3) is not in contact with the fixed contact 3a of the vacuum valve 8 (current interrupting element 3). The movable contact 3b of the valve 8 (current interrupting element 3) is actuated to the first position where it is in contact with the fixed contact 3a of the vacuum valve 8 (current interrupting element 3). The AC current that has flowed through the coil 30 flows through the series circuit 4 of the superconductor 2 and the current interrupting element 3 (vacuum valve 8). Through a series circuit 4 with the element 3 (vacuum valve 8), a normal alternating current can be restored and flowed.

  As described above, according to the first embodiment of the current limiter according to the present invention, the superconductor 2 and the current interrupting element are always used when no excessive alternating current flows through the AC conducting path 1 due to a short circuit accident or the like. The movable conductor 7 connected to the movable contact 3b of the current interrupting element 3 constituting the series circuit 4 with 3 is connected to the series circuit 4 of the superconductor 2 and the current interrupting element 3 by the position holding means 40. Is held at the first position in the movable direction of the movable conductor 7 that is in contact with the fixed contact 3a with respect to the movable contact 3b of the current interrupting element 3 constituting the A normal alternating current is passed through the series circuit 4 of the superconductor 2 and the current interrupting element 3. In this case, the superconductor 2 constituting the series circuit 4 of the superconductor 2 and the current interrupting element 3 is in a superconducting state, and of course, the current interrupting element 3 has a current flowing therethrough. Do not limit. Therefore, in this case, a constant alternating current can be passed through the alternating current conducting path 1 without being substantially limited by the series circuit 4 of the superconductor 2 and the current interrupting element 3.

  Further, if an excessive alternating current flows in the AC current path 1 due to a short circuit accident or the like from such a state, the excessive alternating current flows through the series circuit 4 of the superconductor 2 and the current interrupting element 3. The superconductor 2 of the series circuit 4 is changed from the superconducting state to the non-superconducting state (high resistance state). For this reason, the AC current path 1 is connected to the AC current path 1 via the fixed coil 30 for current limiting. Even if the limited alternating current is allowed to flow, the state where the excessive alternating current flows in the alternating current conducting path 1 is restricted.

  In this case, the superconductor 2 constituting the series circuit 4 of the superconductor 2 and the current interrupting element 3 is changed from a superconducting state to a non-superconducting state (high resistance state) when an excessive alternating current flows therethrough. The conversion is performed at high speed due to the characteristics of the superconductor.

  Further, in this case, since an alternating current in which an excessive alternating current is limited flows through the fixed current limiting coil 30, a magnetic force line is generated from the fixed current limiting coil 30, and a vortex is generated in the movable conductor plate 50 by the magnetic force line. A current is induced, and based on this, a line of magnetic force repelling the line of magnetic force generated from the fixed coil for current limiting is generated from the movable conductor plate 50, thereby operating the movable conductor plate 50, so that the movable conductor 7 is Since the first position held by the position holding means 40 is moved to the second position held by the position holding means 40, the superconductor 2 and the current interrupting element 3 are connected to the AC current path 1. And no current flows through the series circuit 4.

  In this case, the current-limiting fixed coil 30 is wound on the insulating cylinder 33 so as to form a cylindrical body, and the movable conductor plate 50 is almost the same as the inner diameter and the outer diameter of the cylindrical body that the current-limiting fixed coil 30 constitutes. The annular movable conductor plate 50 has an equal inner diameter and outer diameter, and the annular movable conductor plate 50 is disposed concentrically in close proximity to and facing one end surface of the cylindrical body constituting the current-limiting fixed coil 30. Therefore, a magnetic force line repelling the magnetic force line generated from the current limiting fixed coil 30 is effectively generated from the movable conductor plate 50, and thus the movable conductor plate 50, and hence the movable conductor 7, is held by the position holding means 40. Therefore, the operation of the movable conductor plate 7 is effectively obtained from the first position described above, which operates to the second position described above held by the position holding means 40.

  From the above, according to the first embodiment of the current limiter according to the present invention, a normal AC current is always supplied to the AC current path 1, but an excessive AC current is caused by a short circuit accident or the like in the AC current path 1. Even if the current flows, the excessive alternating current is immediately restricted from flowing to the AC current path, and an accident or failure may occur in various electric or electronic devices connected to the AC current path 1. Can be effectively and reliably avoided.

  Further, according to the first embodiment of the current limiter according to the present invention, as will be apparent from the above description, when an excessive alternating current flows in the AC energizing path 1 due to a short circuit accident or the like, Even if an AC current with an excessive AC current limited is passed through the electric current path 1 via the current limiting fixed coil 30, the AC current path 1 is restricted from flowing an excessive AC current. In this case, no current flows through the AC conduction path 1 via the series circuit 4 of the superconductor 2 and the current cutoff element 3, and accordingly, the series circuit 4 of the superconductor 2 and the current cutoff element 3 is Since no current flows through the superconductor 2 that is configured, there is no fear that the superconductor 2 generates heat and the superconductor 2 is damaged.

  Further, for this reason, the short circuit accident that caused the excessive AC current to flow through the AC current path 1 after the state where the excessive AC current is restricted from flowing into the AC current path 1 has been solved. It is possible to return the AC current path 1 to a state in which a normal AC current is flowing through the series circuit 4 of the superconductor 2 and the current interrupting element 3 in series with the superconductor 2 and the current interrupting element 3. Even if the superconductor 2 constituting the circuit 4 is not replaced with a new superconductor, it has an excellent effect that it can be easily performed.

Next, with reference to FIGS. 3 and 4, a second embodiment of the current limiter according to the present invention will be described.
3 and FIG. 4, the same reference numerals are given to the corresponding parts in FIG. 1 and FIG.

  In the second embodiment of the current limiter according to the present invention, as shown in FIG. 3 and in the same manner as in the first embodiment of the current limiter according to the present invention, various electric or electronic devices are connected. A known superconductor 2 which is switched to a non-superconducting state (high resistance state) when the alternating current becomes an excessive alternating current from a state where an alternating current is passed through the alternating current path 1 in a superconducting state; 4 has an electrical configuration in which a series circuit 4 with a current interrupting element 3 having a stationary contact 3a and a movable contact 3b corresponding thereto is inserted, and the current interrupting element 3 is as shown in FIG. In the same manner as in the first embodiment of the current limiter according to the present invention, the same fixed conductor 6 connected to the fixed contact 3a is extended upward and connected to the movable contact 3b. The movable conductor 7 being extended downward It may shall become in the vacuum valve 8.

  Further, in the second embodiment of the current limiter according to the present invention, as shown in FIG. 4 and in the same manner as in the first embodiment of the current limiter according to the present invention, A drive device 11 having a housing 10 in which the drive device 11 is housed, and the drive device body 9 is in an energized state similar to that described in the first embodiment of the current limiter according to the present invention. The operation rod 14 is in an activated state, and is in a biased state from that state, and the operation rod 14 is constituted by a publicly known electromagnetic plunger 15 configured to be able to return to the state before the operation. It can be.

  Further, in the second embodiment of the current limiter according to the present invention, as shown in FIG. 4 and in the same manner as in the first embodiment of the current limiter according to the present invention, on the housing 10 of the driving device 11. A plurality of insulating pillars 16 are planted, an insulating plate 17 is attached to the insulating pillar 16, and a vacuum valve 8 is attached to the insulating plate 17 so as to be suspended below the insulating pillar 17. Is connected to one end of the superconductor 2 inserted in the AC current path 1, and the free end of the movable conductor 7 extending below the vacuum valve 8 serves as the drive device main body 9 of the drive device 11. The electromagnetic plunger 15 is connected to the operating rod 14.

  Further, as shown in FIG. 4 and in the case of the first embodiment of the current limiting device according to the present invention, a sliding contact 21 is applied to the insulating column 16 planted on the housing 10 from the inner peripheral surface. The projecting annular conductor plate 22 is attached in a state in which the sliding contact 21 is in sliding contact with the movable conductor 7 extending below the vacuum valve 8, and from the annular conductor plate 22, A lead wire 34 inserted into the AC current path 1 is led out, and thus the series circuit 4 of the superconductor 2 and the current interrupting element 3 (vacuum valve 8) is connected to the fixed conductor of the vacuum valve 8 of the superconductor 2. 6 is formed between an end A opposite to the side connected to 6 and the lead wire 34.

  Furthermore, in the second embodiment of the current limiter according to the present invention, as shown in FIG. 3, unlike the first embodiment of the current limiter according to the present invention, the superconductor 2 and the current interrupting element 3 (vacuum valve 8) and a series circuit 4 of a current-limiting fixed coil 30 and a movable coil 60 are connected in parallel to the series circuit 4 of the vacuum valve 8.

  In this case, the current-limiting fixed coil 30 is configured to form a cylindrical body on the same insulating cylinder 33 as in the case of the first embodiment of the current limiter according to the present invention as shown in FIG. The one end of the superconductor 2 is connected to the end A of the superconductor 2 opposite to the side connected to the fixed conductor 6 of the vacuum valve 8. Unlike the case of the first embodiment of the current limiter according to the present invention, as will be described later, it is connected to the above-described annular conductor plate 22, and thus a series circuit 61 of the current-limiting fixed coil 30 and the movable coil 60. Is connected in parallel with the series circuit 4 of the superconductor 2 and the current interrupting element 3 (vacuum valve 8) between the end A of the superconductor 2 and the lead wire 34 described above.

  Further, in the second embodiment of the current limiter according to the present invention, as shown in FIG. 4 and similar to the case of the first embodiment of the current limiter according to the present invention, the same movable conductor 7 is evacuated. The first position where the movable contact 3b of the valve 8 is in contact with the fixed contact 3a of the vacuum valve 8, and the first position where the movable contact 3b of the vacuum valve 8 is not in contact with the fixed contact 3a of the vacuum valve 8. Position holding means 40 for selectively holding at position 2 is provided.

  Further, in the second embodiment of the current limiting device according to the present invention, as shown in FIG. 4, the moving coil 60 described above is described as follows so as to form a cylindrical body on the insulating cylinder 63 described below. Wrapped around.

  That is, instead of the case of the first embodiment of the current limiting device according to the present invention in which the movable conductor plate 50 is attached to the movable conductor 7 extending downward from the vacuum valve 8, At a position below the corresponding position, an insulating plate 62 is attached using a mother screw 52, and the current-limiting fixed coil 30 is wound around the insulating plate 62 so as to form a cylindrical body. An insulating cylinder 63 having an outer diameter substantially equal to the outer diameter of the insulating cylinder 33 is fixedly attached using bolts 64 so as to be concentric with the insulating cylinder 33, and on the insulating cylinder 63. Further, the insulating cylinder 33 of the current limiting fixed coil 30 is configured such that the movable coil 60 forms a cylindrical body having an inner diameter and an outer diameter substantially equal to the inner diameter and the outer diameter of the cylindrical body constituting the current limiting fixed coil 30. Winding opposite to the winding direction above By being wound and arranged in a direction, the movable coil 60 is generated on the movable conductor 7 by energizing it from the fixed coil 30 for current limiting. The movable conductor 7 is held by the position holding means 40 from the first position held by the position holding means 40 so that the magnetic lines of force repel the magnetic lines of force to be generated. It is positioned and arranged so as to operate at the position 2.

The above is the configuration of the second embodiment of the current limiting device according to the present invention.
According to the second embodiment of the current limiter according to the present invention having such a configuration, as in the case of the first embodiment of the current limiter according to the present invention, the drive device main body of the drive device 11 is always provided. In the state where the electromagnetic plunger 15 as 9 is in the non-biased state where the operating rod 14 is not operated, the movable conductor 7 is moved to the movable contact of the vacuum valve 8 (current interrupting element 3) by the position holding means 40. The element 3b can be held in the first position where it is in contact with the stationary contact 3a of the vacuum valve (current interrupting element 3). Therefore, various electric or electronic devices are always connected. In accordance with the case of the first embodiment of the current limiter according to the present invention, the superconductor 2 is not connected to the alternating current carrying path 1 without the series circuit 61 of the current limiting fixed coil 30 and the movable coil 60. And current interrupting element 3 (vacuum valve ) Via a series circuit 4 and it is possible to obtain a state in which flowing constantly alternating current.

  However, if an excessive alternating current flows through the AC current path 1 due to a short circuit accident or the like from such a state, the series circuit 4 of the superconductor 2 and the current interrupting element 3 (vacuum valve 8), and therefore An excessive alternating current flows through the conductor 2, and therefore the superconductor 2 is switched from the superconducting state to the non-superconducting state (high resistance state). In accordance with the first embodiment, a current flows through the series circuit 61 of the current limiting fixed coil 30 and the movable coil 60, that is, the current limiting fixed coil 30 and the movable coil 60 are energized, thereby , A line of magnetic force is generated from the fixed current limiting coil 30 toward the movable coil 60 attached to the movable conductor 7, and the magnetic force is applied from the movable coil 60 attached to the movable conductor 7 toward the fixed current limiting coil 30. In this case, the movable coil 60 is wound and arranged on the insulating cylinder 63 in a winding direction opposite to the winding direction of the fixed coil 30 for current limiting on the insulating cylinder 33. The magnetic lines of force from the movable coil 60 to the fixed current limiting coil 30 are magnetic lines that repel the magnetic lines of force from the fixed current limiting coil 30 to the movable coil 60 side.

  For this reason, the movable coil 60 is mechanically operated downward together with the movable conductor 7 and the disk body 43 of the position holding means 40, and the inner edge of the bullet plate 48 of the position holding means 40 is pushed downward. Thereby, the movable contact 3b of the vacuum valve 8 (current interrupting element 3) is fixed to the movable contact 3a of the vacuum valve 8 (current interrupting element 3). The movable contact 3b of the vacuum valve 8 (current interrupting element 3) held by the position holding means 40 from the first position in contact with the fixed contact 3a of the vacuum valve 8 (current interrupting element 3) It is actuated to the second position where it is not in contact. Therefore, the current that has been flowing through the series circuit 4 of the superconductor 2 and the current interrupting element 3 does not flow at all and is fixed to the AC current path 1 for current limiting. Coil 30 and movable Only through the series circuit 61 between yl 60, so that the shed limited excessive alternating current alternating current flows.

  Therefore, if an excessive AC current flows through the AC current path 1 due to a short circuit accident or the like, the limit of the excessive AC current is limited to the AC current path 1 as in the first embodiment of the current limiter according to the present invention. Even if a flowing AC current is supplied, an excessive AC current is not supplied. Therefore, it is possible to effectively prevent an accident, a failure, etc. from occurring in various electric or electronic devices connected to the AC current path 1. It can be avoided reliably.

  It should be noted that a short-circuit accident that caused an excessive AC current to flow through the AC energizing path 1 after the AC current with the excessive AC current being limited is passed through the AC energizing path 1 is resolved. Then, according to the case of the first embodiment of the current limiter according to the present invention, the AC current path 1 is connected to the AC current path 1 via the series circuit 61 of the current limiting fixed coil 30 and the movable coil 60. The limited alternating current will flow, and therefore, after the alternating current with the excessive alternating current restricted is flowing through the alternating current conducting path 1, the excessive alternating current will flow through the alternating current conducting path 1. After the short-circuit accident or the like has been resolved, it is impossible to allow a normal alternating current to flow through the alternating current conducting path 1.

  However, if the electromagnetic plunger 15 as the drive device main body 9 of the drive device 11 is energized from such a state, as in the case of the first embodiment of the current limiter according to the present invention, the limit according to the present invention. In accordance with the case of the first embodiment of the flow device, the operating rod 14 is operated upward together with the movable conductor 7, the disk body 43 of the position holding means 40 and the movable coil 60, and the position holding means. 40, the inner edge of the bullet plate 48 is pushed upward, whereby the movable contact 3b of the vacuum valve 8 (current interrupting element 3), in which the movable conductor 7 is held by the position holding means 40, is vacuumed. The movable contact 3b of the vacuum valve 8 (current blocking element 3) held by the position holding means 40 is vacuumed from the second position where it is not in contact with the fixed contact 3a of the valve 8 (current blocking element 3). Valve 8 (electric Actuated to the first position in contact with the fixed contact 3a of the interrupting element 3), the AC current that has been flowing through the series circuit 61 of the current limiting fixed coil 30 and the movable coil 60 until now is The current flows through the series circuit 4 of the superconductor 2 and the current interrupting element 3 (vacuum valve 8). Therefore, the AC conductor 1 is connected to the series of the superconductor 2 and the current interrupting element 3 (vacuum valve 8). It is possible to return to a state in which a normal alternating current is flowing via the circuit 4.

  As described above, according to the second embodiment of the current limiter according to the present invention, as in the case of the first embodiment of the current limiter according to the present invention, for the same reason, A constant alternating current can flow without being substantially limited by the series circuit 4 of the superconductor 2 and the current interrupting element 3.

  In addition, if an excessive alternating current flows in the AC current path 1 due to a short circuit accident or the like from such a state, the excessive alternating current is reduced according to the case of the first embodiment of the current limiter according to the present invention. By flowing through the series circuit 4 of the superconductor 2 and the current interrupting element 3, the superconductor 2 of the series circuit 4 is switched from the superconducting state to the non-superconducting state (high resistance state). Even if an alternating current with an excessive AC current limited is passed through the current path 1 via the series circuit 61 of the current limiting fixed coil 30 and the movable coil 60, the AC current path 1 is restricted from flowing an excessive AC current. In this case, the superconductor 2 constituting the series circuit 4 of the superconductor 2 and the current interrupting element 3 is brought out of the superconducting state by passing an excessive alternating current therethrough. Superconducting state (high resistance state And converted to its transformation, the characteristics of the superconductor is carried out at high speed.

  Further, in this case, since an alternating current in which the excessive alternating current is limited flows through the series circuit 61 of the fixed current limiting coil 30 and the movable coil 60, the magnetic field lines directed from the fixed current limiting coil 30 to the movable coil 60 side are reduced. Further, a magnetic field line is generated from the movable coil 60 toward the fixed current limiting coil 30 and repels the magnetic field generated from the fixed current limiting coil 30, whereby the movable coil 60 is mechanically operated. Therefore, the movable conductor 7 operates from the above-described first position held by the position holding means 40 to the above-described second position held by the position holding means 40. No current flows through the series circuit 4 of the conductor 2 and the current interrupting element 3.

  In this case, the current-limiting fixed coil 30 and the movable coil 60 are respectively wound on the insulating cylinders 33 and 63 so as to form cylindrical bodies having substantially the same inner diameter and outer diameter, and the movable coil 60 is formed. Are arranged concentrically in close proximity to one end surface of the cylindrical body constituting the current limiting fixed coil 30, so that the magnetic field lines and the movable lines from the current limiting fixed coil 30 repelling each other are movable. The magnetic field lines from the coil 60 are effectively obtained, so that the operation of the movable coil 60, and hence the movable conductor 7, is held by the position holding means 40 from the above-described first position held by the position holding means 40. It is possible to effectively obtain the operation of operating to the above-described second position.

  From the above, in the case of the second embodiment of the current limiter according to the present invention, as in the case of the first embodiment of the current limiter according to the present invention, the AC current path 1 is always connected to the AC current path 1 at all times. Even if an excessive AC current flows through the AC current path 1 due to a short circuit accident or the like, the excessive AC current is quickly restricted from flowing into the AC current path 1 and connected to the AC current path 1. It is possible to effectively and reliably avoid the occurrence of accidents, failures, etc. in various electric or electronic devices.

  Further, according to the second embodiment of the current limiting device according to the present invention, as is apparent from the above description, when an excessive alternating current flows in the AC energizing path 1 due to a short circuit accident or the like, the present invention In accordance with the first embodiment of the current limiting device according to the present invention, an alternating current with an excessive alternating current is passed through the AC current path 1 via the series circuit 61 of the fixed current limiting coil 30 and the movable coil 60. However, in this case, as in the case of the first embodiment of the current limiter according to the present invention, the AC communication path is limited. No current flows through the electric circuit 1 via the series circuit 4 of the superconductor 2 and the current interrupting element 3, and therefore the superconductor constituting the series circuit 4 of the superconductor 2 and the current interrupting element 3. Since no current flows through the conductor 2, Exotherm to conductor 2, the or damaged superconductor 2 occurs, any no fear that.

  For this reason, as in the case of the first embodiment of the current limiter according to the present invention, the AC energizing path 1 is limited to the state where the excessive AC current is restricted from flowing through the AC energizing path 1. When a short-circuit accident that caused an excessive alternating current to flow through has been resolved, a state in which a constant alternating current is flowing through the AC conduction path 1 via the series circuit 4 of the superconductor 2 and the current interrupting element 3 The excellent effect that it can be easily restored without replacing the superconductor constituting the series circuit 4 of the superconductor 2 and the current interrupting element 3 with a new superconductor. Have

  In the above description, only two embodiments of the current limiting device according to the present invention have been described, and various modifications can be made without departing from the spirit of the present invention.

  The current limiter according to the present invention is effective and easy to restrict an excessive current from flowing due to a short circuit accident or the like to an AC current path connecting various electric or electronic devices in an AC power transmission and distribution system, etc. Can be used.

1 is a connection diagram electrically showing a first embodiment of a current limiting device according to the present invention; FIG. 1 is a cross-sectional view of a part of an electromechanical first embodiment of a current limiting device according to the present invention. FIG. 6 is a connection diagram electrically showing a second embodiment of the current limiting device according to the present invention. It is a figure which makes the cross section a part which shows the 2nd Example of the current limiting device by this invention electromechanically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC current path 2 Superconductor 3 Current interruption element 3a Fixed contact 3b Movable contact 4 Series circuit 5 Vacuum container 6 Fixed conductor 7 Movable conductor 8 Vacuum valve 9 Drive device main body 10 Housing 11 Drive device 12 Operation switch 13 Drive Power supply 14 for apparatus main body 15 Actuator rod 15 Electromagnetic plunger 16 Insulating column 17 Insulating plate 18 Bolt screw 19 Bolt 21 Sliding contactor 22 Annular conductor plate 23 Bolt screw 30 Current limiting fixed coil 31 Insulating ring plate 32 Mother screw 33 Insulating cylinder 34 Lead wire 35 Bolt 40 Position holding means 41 Mother screw 42 Engaging groove 43 Disc body 44 Bolt 45 Engaging groove 46 Cylindrical body 48 Conical bullet plate 50 Movable conductor plate 51 Insulating ring plate 52 Mother screw 60 Movable coil 61 Series circuit 62 Insulation plate 64 volts

Claims (4)

In the AC current path, a series circuit of a superconductor and a current interrupting element having a stationary contact and a movable contact with respect to the superconductor is inserted,
In parallel with the series circuit, a fixed coil for current limiting is connected,
A movable conductor is connected to the movable contact of the current interrupting element,
In relation to the movable conductor, the movable conductor is connected to the first position in the movable direction of the movable conductor where the movable contactor of the current interrupting element is in contact with the fixed contactor of the current interrupting element, and the current. Position holding means for selectively holding the movable contact of the interrupting element at the second position in the movable direction of the movable conductor that is not in contact with the fixed contact of the current interrupting element is provided,
The movable conductor plate that induces eddy currents in the movable conductor by external magnetic lines and generates magnetic lines based on the eddy currents is used as the magnetic lines generated by energizing the external magnetic lines from the current-limiting fixed coil. The magnetic field lines generated based on the eddy current are changed to the magnetic field lines repelling the magnetic field lines generated by energizing the current-carrying fixed coil, and thereby the movable conductor is moved to the position holding means. The current limiter is positioned and attached so as to be operated from the first position held by the first position to the second position held by the position holding means. The current limiting device according to claim 1,
The current-limiting stationary coil is wound so as to constitute a cylindrical body,
The movable conductor plate is an annular movable conductor plate having an inner diameter and an outer diameter substantially equal to the inner diameter and the outer diameter of the cylindrical body that the current-limiting fixed coil constitutes,
A current limiting device characterized in that the annular movable conductor plate is disposed concentrically in close proximity to one end face of the cylindrical body constituting the current limiting fixed coil. In the AC current path, a series circuit of a superconductor and a current interrupting element having a stationary contact and a movable contact with respect to the superconductor is inserted,
In parallel with the series circuit, a series circuit of a fixed coil for current limiting and a movable coil is connected,
A movable conductor is connected to the movable contact of the current interrupting element,
In relation to the movable conductor, the movable conductor is connected to the first position in the movable direction of the movable conductor where the movable contactor of the current interrupting element is in contact with the fixed contactor of the current interrupting element, and the current. Position holding means for selectively holding the movable contact of the interrupting element at the second position in the movable direction of the movable conductor that is not in contact with the fixed contact of the current interrupting element is provided,
In the movable conductor, the movable coil is configured so that the magnetic field lines generated by energizing the movable coil are changed to the magnetic field lines repelling the magnetic field lines generated by energizing the current-limiting fixed coil, and Thus, the movable conductor is positioned and attached so as to operate from the first position held by the position holding means to the second position held by the position holding means. Current limiting device characterized by The current limiting device according to claim 3,
The current-limiting stationary coil and the movable coil are wound so as to constitute cylindrical bodies having substantially the same inner diameter and outer diameter,
A current limiting device, characterized in that the cylindrical body constituting the movable coil is disposed concentrically in close proximity to one end surface of the cylindrical body constituting the current limiting fixed coil.

Images