JP2000132247A - Superconduction current controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strengthen a magnetic core by using a magnetic core including a dumping element and a leg having a part made of or filled with material whose magnetic resistance is larger than the magnetic core resistance, to eliminate the adjustment limit of magnetic resistance in a conventional device and to improve a current limitation characteristic. SOLUTION: This superconduction current controller 10A includes a magnetic core 50 which has a saturation state and a non-saturation state and is magnetically saturable and a primary coil 52 which makes current pass through the core 50 so as to generate magnetic flux in the core, the magnetic core 50 has a main magnetic path that is provided with a damping element and makes all of the generated magnetic flux pass through and 1st and 2nd magnetic paths, the 1st magnetic path makes a 1st part of the magnetic flux pass through, and although the 2nd magnetic path a 2nd part of the magnetic path pass through, it is provided with a damping element that offsets the 2nd part magnetic flux and prevents the core from being saturated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current control device, and more particularly, to a leg and a damping element formed of a material having a magnetic resistance higher than that of a magnetic core or having a portion filled with the material. The present invention relates to a superconducting current control device in which current limiting characteristics are improved by using a magnetic core including the same.

[0002]

2. Description of the Related Art In general, most electric devices are equipped with protective equipment such as a thermal fuse or a circuit breaker to protect a circuit from an overcurrent caused by a sudden change in load impedance or an increase in short-circuit fault current. I have.

However, at a current level higher than a predetermined rated value, a fuse that blows or a circuit breaker that performs a breaking operation has a slow operation from exceeding the rated value to being broken.
It may not be possible to cope with a change in current in a very short time such as a transient state.

In order to overcome such disadvantages, various current control devices used with fuses and circuit breakers have been proposed, one of which is a superconducting current control using a magnetic flux canceling effect of a superconductor. Device.

[0005] The magnetic flux canceling effect of the short-circuited superconductor 100 will be described below with reference to FIG.

The superconductor 100 maintains a superconducting state when exposed to a magnetic field H capable of inducing a current I below a threshold into the superconductor 100. As a result, a reverse magnetic field −H is generated in the superconductor 100 in a direction in which the current I cancels the magnetic field H. As a result, the magnetic field H linked to the superconductor 100
Are offset by the reverse magnetic field -H. On the other hand, if there is a magnetic field H capable of inducing a current exceeding the threshold value into the inside of the superconductor 100, the superconductor 100 is broken and transitions to a resistance state.

The transition from the superconducting state to the resistance state is as follows:
The reverse magnetic field -H is absolutely weakened, and the magnetic flux canceling property of the superconductor 100 is lost.

As a result, the magnetic field H linked to the superconductor 100 remains without being canceled by the reverse magnetic field -H.

FIG. 7 shows an example of an electric apparatus 5 including a conventional superconducting current control device 10 using a magnetic flux canceling effect of a superconductor.

The superconducting current control device 10 includes a main winding 1
10, superconducting element 120, and saturable magnetic core 1
30.

The main winding 110 is connected to an external circuit 20 via terminals A and B to electrically connect the superconducting current controller 10 to the external circuit 20. The external circuit 20 is connected to a voltage source Vs
And a load resistance RL. The main winding 110 shown is
The conductive coil has a superconducting ring shape, and the superconducting element 120 has a superconducting ring shape.

In the electric equipment 5, a circuit current determined by the voltage source Vs and the overall impedance of the electric equipment 5 flows through the load resistance RL and the main winding 110. The overall impedance is mainly determined by the load resistance RL and the additional impedance caused by the superconducting current controller 10.

The operation of the electric equipment 5 shown in FIG.
This will be described with reference to FIG.

In a normal state, when a normal current below transition point P shown in FIG. 8 flows through main winding 110, superconducting element 120 maintains the superconducting state.

Therefore, as described in FIG. 6, the reverse magnetic flux generated by the superconducting element 120
By canceling out the magnetic flux generated by the zeros, the inductance of the main winding 110 becomes almost zero.

As a result, the impedance of the superconducting current control device 10 depends on the internal leakage inductance and the main winding 1.
10, the additional impedance caused by the superconducting current control device 10 is very small, and has little effect on the overall impedance of the electric device 5. Flow through 5.

On the other hand, in a fault condition, for example, when a sudden change in load impedance or an increase in short-circuit fault current is supplied to the main winding 110, the fault current causes the main winding 110 to fail.
, And induces a current above the threshold in the superconducting element 120, causing the superconducting element 120 to transition from a superconducting state to a resistive state.

Therefore, as described with reference to FIG.
The magnetic flux generated by the superconducting element 120
Cannot be offset by the reverse magnetic flux generated by Therefore,
When the superconducting element 120 transitions from the superconducting state to the resistive state, the resultant magnetic flux increases and the inductance between the terminals A and B increases rapidly, so that the impedance of the superconducting current controller 10 also increases. . Thus, the overall impedance of the electric device 5 increases rapidly, and the magnitude of the fault current flowing through the electric device 5 is limited.

[0019]

However, in the above-described superconducting current control device 10, as shown in FIG. 8, the fault current keeps increasing and approaches the saturation point Q at which the magnetic core 130 is saturated. , The superconducting current control device 10
If the fault current is not limited by the change in impedance caused by the above, the inductance of the main winding 110 becomes very small, and the additional impedance by the current control device 10 also becomes small.

As a result, when the magnetic core 30 is saturated,
A large unrestricted fault current flows through the external circuit 20, causing damage to the external circuit 20.

In order to solve the above-mentioned saturation problem, it is possible to design a superconducting current controller 10 which can withstand a large current. However, there is a disadvantage that the manufacturing cost of the superconducting current control device 10 is increased because the sectional area of the superconducting current control device 10 is increased or the number of windings of the main winding is increased.

Therefore, in order to solve the above-mentioned problem,
A superconducting current controller comprising a magnetic core having a damping element and a magnetic leg having an air gap has been proposed.
This device is disclosed, for example, in Japanese Unexamined Patent Publication No. Hei 10-116743, entitled "Superconducting Head Flow Device Introducing a Gap".

However, in such a conventional superconducting current controller, the air gap is always filled with a filler such as air, oil or refrigerant, and it is difficult to adjust the magnetic resistance. The magnetic resistance of the gap
distance).

Further, in the conventional superconducting current control device,
There is the disadvantage that the gaps in the magnetic legs can have structural defects.

Accordingly, a primary object of the present invention is to provide a magnetic core comprising a magnetic core including a damping element and a leg having a portion that is made of or packed with a material whose magnetoresistance is greater than the resistance of the magnetic core. It is an object of the present invention to provide a superconducting current control device that improves the current limiting characteristic by eliminating the limitation of the magnetoresistance in the conventional device by solving the problem of core saturation by enhancing the core saturation problem.

[0026]

In order to achieve the above object, the present invention provides a superconducting current controller for limiting the current of an electric circuit, comprising a magnetically saturable device having a saturated state and an unsaturated state. A core, and an input coil electrically connecting the core to the electric circuit to allow a current to pass through the core so that a magnetic flux is generated in the core, wherein the core transmits the generated magnetic flux. A main magnetic path that allows all to pass,
At least two magnetic paths, of which the first magnetic path passes a first portion of the magnetic flux, and the second magnetic path passes a second portion of the magnetic flux. A superconducting current controller is provided that includes a damping element that offsets at least a portion of the second portion of magnetic flux, thereby preventing the core from becoming saturated.

[0027]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 are schematic diagrams of a superconducting current controller according to a preferred embodiment of the present invention.

FIG. 1 is a schematic diagram of a superconducting current control device 10A according to a first embodiment of the present invention. The superconducting current controller 10A includes two longitudinal members (or
Yoke) and a plurality of magnetic branch elements (or legs) connecting them.
Is provided.

In this embodiment, for example, the upper yoke 58D and the lower yoke 58E, which are longitudinal members,
Magnetic core 5 formed by connecting three first to third magnetic legs 58A, 58B, 58C serving as magnetic branch elements
0 is shown as an example.

The magnetic core 50 is not limited as long as it is a magnetically saturable material having a saturated state and an unsaturated state, and the second magnetic leg 58B has a magnetic resistance of the upper yoke 5.
8D, lower yoke 58D, first magnetic leg 58A, second
It has an inducing element 55 made of or filled with a material larger than the reluctance of the magnetic leg 58B. In other words, the inducing element 55 is made or filled with a material whose reluctance is greater than the reluctance of the other parts of the magnetic core 50.

The material forming the inducing element 55 is magnetic or non-magnetic on the assumption that its magnetic resistance is larger than the magnetic resistance of the other parts of the magnetic core 50. The material may be formed of a solid, gas or liquid, or a combination thereof. In the present embodiment, a solid, for example, a metal body such as a micro metal is used as the material.

However, when a material other than a pure solid is used as the material of the inducing element 55, that is, when the inducing element 55 is formed of a material whose shape is not maintained by filling or the like, the inducing element 55 has its structural and functional characteristics. To maintain integrity, it should be formed of a hollow, solid body.

Although the cross-sectional area of the inducing element 55 is variable, it is preferable that this cross-sectional area be substantially the same as the cross-sectional area of the second magnetic leg 58B. Further, as shown in FIG. 7, the superconducting current control device 10A includes an input coil,
That is, the primary coil 52 is used to connect to an external circuit, and the input coil is connected to an external circuit (not shown) via two terminals, for example, A and B.

Further, the superconducting current control device 10A has the structure shown in FIG.
As shown in FIG. 5, in addition to the superconducting element 54, the inducing element 5
5 further comprising a damping element 56 surrounding a second magnetic leg 58B having a five. Preferably, the primary winding 52 is a magnetic leg having no inductive element, for example a first leg.
By forming a coil having a predetermined number of turns surrounding the magnetic leg 58A or the superconducting element 54, it is made of a superconducting material or a non-superconducting material, for example, a common conductive material.

The superconducting element 54 is formed, for example, of one or more rings, cylinders, short-circuit coils or similar superconductors and surrounds the magnetic leg without a yoke or inductive element. . The primary winding 52 and the superconducting element 54 can be located anywhere on the magnetic core 50 other than the magnetic legs having inductive elements packed with high reluctance materials as described above. As a specific example, the primary winding 52 and the superconducting element 54 may be mounted on the yoke of the magnetic core 50 or on any magnetic leg that does not have an inductive element filled with a high reluctance material, as shown in FIG. 1 and 2, or one of the primary winding 52 and the superconducting element 54 may overlap and be positioned inside or outside the other.

Furthermore, one of the primary winding 52 and the superconducting element 54 is arranged on a magnetic leg that does not have a yoke or the inductive element, and the other one connects another yoke or the inductive element. It can also be placed on a magnetic leg that does not have it.

More preferably, however, the primary winding 52 and the superconducting element 54 are both co-located, ie, one inside or the other one, as shown in FIGS. It is to arrange so that it becomes. If the primary winding 52 and the superconducting element 54 are separately provided on the magnetic core 50, a leakage magnetic flux not canceled by the superconducting element 54 may be generated, and the magnetic flux canceling effect of the superconducting element 54 may be reduced.

In the present embodiment, the damping element 56
Can be made of a superconducting material, and include a magnetic leg with an inductive element filled with a high magnetoresistance material, such as one or more rings, cylinders, shorted coils or It has a similar form. For example, in the embodiment shown in FIG. 1, the damping element 56 is formed of three superconducting rings stacked axially around the second magnetic leg 58B.

The operation of the superconducting current controller 10A will be described below with reference to FIGS. First, when a normal current belonging to a normal state, that is, a predetermined range (for example, point P or lower in FIG. 3) flows through the primary winding 52, the normal current in the primary winding 52 causes the superconducting element 54 The superconducting element 54 maintains a superconducting state because a magnetic flux is generated that induces a current below the threshold value.

Accordingly, the magnetic flux generated by the primary winding 52 is canceled by the corresponding reverse magnetic flux generated by the superconducting element 54, so that no magnetic flux flows through the magnetic core 50. As a result, the inductance seen from the terminals A and B is very small, and the impedance of the superconducting current control device 10A is also small, so that the external circuit is hardly affected by the superconducting current control device 10A.

On the other hand, in the accident state, that is, the primary winding 52
If the fault current flowing through the superconducting element exceeds a predetermined range and generates a magnetic flux in the superconducting element 54 that induces a current exceeding a threshold value, the superconducting element 54 becomes in a resistance state and loses a magnetic flux canceling property. Thereby, the impedance of the superconducting current control device 10A increases, and the fault current flowing through the external circuit is limited.

The conventional superconducting current controller 1 shown in FIG.
At zero, the fault current is not limited, but rather increases steadily to saturate the magnetic core 130, for example,
When approaching the point Q in FIG. 8, the impedance of the superconducting current control device 10 rapidly decreases again, so that a considerably large fault current flows through the external circuit, and the external circuit is damaged.

However, according to the present invention, the inducing element 55 and the second magnetic leg 58 filled with a material having a high magnetoresistance are used.
Such a saturation problem can be solved by delaying and suppressing the saturation of the magnetic core 50 using the combined characteristics of the B and the damping element 56. In particular, in an accident condition, the first closed magnetic path 59 passing through the two parallel magnetic paths, that is, the first and third magnetic legs 58A and 58C, and the first and second
A second closed magnetic path 57 passing through the magnetic legs 58A and 58B is formed in the magnetic core 50. In other words, the magnetic core 50
There are three magnetic paths inside. That is, the first magnetic leg 5
8A, a main magnetic path transmitting the total magnetic flux generated in the magnetic core 50, a first magnetic path transmitting most of the total magnetic flux via the third magnetic leg 58C, and a second magnetic leg 58B via the second magnetic leg 58B. There is a second magnetic path for transmitting the remainder of the total magnetic flux.

Specifically, until the third magnetic leg 58C is saturated, the magnetic resistance of the second magnetic leg 58B is very large and substantially constant by the inducing element 55 filled with a material having high magnetic resistance. , The magnetoresistance of the third magnetic leg 58C of the magnetic core 50 is reduced by the inducing element 55.
And the second magnetic leg 58B having the damping element 56 is smaller than the magnetic resistance of the second magnetic leg 58B.

Therefore, the magnetic flux generated by the primary winding 52 flows mainly along the first closed magnetic path 59. On the other hand, the magnetic flux is strengthened by the accident current, and the magnetic legs 58A, 58B,
When the magnetic flux flowing through 58C approaches the saturation point, the third
Although the magnetic resistance of the magnetic leg 58C increases, the magnetic resistance of the second magnetic leg 58B keeps a substantially constant state, so that a part of the magnetic flux flowing through the magnetic core 50 flows out along the second closed magnetic path 57. . The magnetic flux distribution condition on the magnetic leg as described above can be controlled by the characteristics of the magnetic core 50, for example, the size of the induction element 55 and the magnetic resistance characteristics of the material constituting the induction element.

More specifically, if a relatively low fault current is applied to the primary winding 52 and the reluctance of the third magnetic leg 58C is sufficiently smaller than the reluctance of the second magnetic leg 58B having the inducing element 55, the primary Since the magnetic flux generated by the winding 52 flows mainly along the third magnetic leg 58C, that is, the first closed magnetic path 59, the ratio of the magnetic flux flowing through the second magnetic leg 58B, that is, the second closed magnetic path 57 Will be very low.

However, the fault current increases and the third
When the magnetic flux flowing through the magnetic leg 58C approaches the saturation point, the magnetic resistance of the third magnetic leg 58C increases, and the rate of increase of the magnetic flux flowing through the third magnetic leg 58C gradually decreases. On the other hand, as described above, since the magnetic resistance of the second magnetic leg 58B maintains a constant state, the ratio of the magnetic flux flowing through the second magnetic leg 58B gradually increases. However, because the magnetic flux flowing through the second magnetic leg 58B is still smaller than the magnetic flux flowing through the third magnetic leg 58C, the damping element 56 always retains its magnetic flux canceling characteristics.

Accordingly, the magnetic flux flowing through the second magnetic leg 58B is canceled by the reverse magnetic flux generated by the damping element 56. Thus, there is no magnetic flux flowing through the second magnetic leg 58B, and the magnetic flux flowing through the magnetic core 50 does not reach the saturation point or delay because the magnetic flux flowing through the second magnetic leg 58B cancels out. Is done. As a result, the saturation problem of the magnetic core 50 does not occur, and a phenomenon such as a sudden increase in the fault current can be avoided.

In the first embodiment described above, the amount of magnetic flux flowing through the second magnetic leg 58B is proportional to the ratio between the magnetic resistance of the third magnetic leg and the magnetic resistance of the second air leg. That is, when the reluctance of the third magnetic leg 58C increases, the magnetic flux flowing through the second magnetic leg 58B also increases, so that the increased magnetic flux is canceled by the damping element 56. The damping element 56 is shown in FIG.
Since the characteristics such as the magnetic flux canceling effect of the superconductor 100 described in (1) are maintained, a reverse magnetic field
H can be generated to offset the expected amount of magnetic flux flowing through the second closed magnetic path 57 or more.

Therefore, when the first embodiment is used, the magnetic flux generated by the fault current is reduced by the damping element 5.
6, the magnetic core 50 can be prevented from reaching a saturated state, and the superconducting current control device 10A can detect the fault current and limit the conduction current without using any external control circuit.

FIG. 2 shows a superconducting current controller 10B according to a second embodiment of the present invention. The superconducting current control device 10B includes a damping element 66 and a magnetic core 60 having an inductive element 65 formed of a material whose magnetic resistance is larger than that of the magnetic core 60 or filled with the material. ing.

The magnetic core 60 in the second embodiment is
The structure is such that the positions of the second and third magnetic legs of the magnetic core 50 of the first embodiment shown in FIG. 1 are replaced with each other, and the damping element 66 replaces the superconducting ring in FIG. It is in the form of a superconducting cylinder.

Except for the positions of the second and third magnetic legs and the form of the damping element, the superconducting current controller 10B according to the present embodiment is different from the superconducting current controller 1 shown in FIG.
Since it is functionally the same as 0A, details of its structure and operation are omitted.

FIG. 3 shows a superconducting current controller 10C according to a third embodiment of the present invention. The superconducting current controller 10C includes first to third magnetic legs 62A, 62B,
62C and a magnetic core 61 having a damping element 63. In the present embodiment, a part of the second magnetic leg 62B in FIG. 1 is an inductive element filled with a material having a high magnetoresistance. All are made of a material having a magnetoresistance greater than that of the third magnetic leg 62C.

The superconducting current control device 10C according to the third embodiment has the same function as the superconducting current control device 10A shown in FIG. 1, and the details of the structure and operation are omitted. .

In each of the embodiments described above, the magnetic core having three magnetic legs has been mainly described. However, the number of magnetic legs in this embodiment can be changed. For example, the magnetic core may have one or more of an inductive element and a damping element packed with a high reluctance material to improve magnetic flux distribution characteristics so as to effectively prevent the magnetic core from being saturated. May be included. Similarly, the number of magnetic legs having no inductive element and no element can be designed to be two or more.

As described above, according to the present embodiment, since the saturation of the magnetic core is effectively prevented, the superconducting current controller avoids a sudden decrease in the inductance of the main winding in the event of an accident. And the current limiting characteristics are improved.

Further, since the superconducting current controller can solve the saturation problem without using the damping element to increase the cross-sectional area of the magnetic core, the manufacturing cost of the superconducting current controller can be greatly reduced. it can.

Further, by using the inducing element according to the present invention, the magnetic resistance of the magnetic leg having the inducing element and the structural strength of the magnetic core can be further adjusted. The current limiting characteristics obtained by the inductive element and the damping element of the present invention can also be applied to a conventional inductor (or regulator) that attempts to adjust a current fluctuation in an electric circuit.

FIG. 4 shows an inductor 75 of the present invention connected to an external circuit 70.

The inductor 75 includes a magnetic core 76 having three magnetic legs 78A-78C, with a main winding 72 aligned with the first magnetic leg 78A and illustratively a damping element having a superconducting ring configuration. 74 is a second element having an inductive element filled with a material having a high magnetoresistance.
Surrounds the magnetic leg 78B.

The magnetic core 76 may also have more than two magnetic legs, but may have more than two magnetic legs made of a material whose reluctance is greater than the reluctance of the magnetic core or without packed inductive elements. It must include a magnetic leg and at least one magnetic leg with an inducing element.

In the structure of the inductor 75, the main winding 72 can be located anywhere in the magnetic core 76 except for the second magnetic leg 78B having an inductive element filled with a material having a high magnetoresistance.

When an accident current that causes the magnetic core 76 to approach a saturated state is applied to the inductor 75, the main winding 7
A portion of the magnetic flux generated by the fault current flowing through the second magnetic leg 78B flows out through the second magnetic leg 78B, which is offset by the magnetic flux generated by the damping element 74.

As a result, as described in the other embodiments described above, the magnetic core 76 in the inductor 75 is not saturated or is delayed in saturation, thereby limiting the fault current. These current limiting properties can also be obtained with a transformer comprising an induction element packed with a high reluctance material according to the invention and a magnetic leg with a damping element.

FIG. 5 shows a power supply side circuit 80 and a load side circuit 8.
1 is connected to the transformer 85. Transformer 8
5 is a plurality (for example, three) of magnetic legs 83A-
83C comprising a magnetic core 88 having at least one magnetic leg formed of a material having a magnetoresistance greater than the magnetoresistance of the magnetic core 88 or having an inductive element filled with the material. And two or more magnetic legs without this inducing element.

The primary winding 82 is located on the first magnetic leg 83 A having no inductive element, and is connected to the power supply side circuit 80. The secondary winding 86 is located, for example, on the third magnetic leg 83C without any inductive element, and is connected to the load-side circuit 81.

The primary and secondary windings 82, 86 can be made of a superconducting or non-superconducting material. The primary winding 82 is connected to the power supply side circuit 8.
0 to the transformer 85 and the secondary winding 86
Is generated by the primary winding 82 and the third magnetic leg 83C
To the load-side circuit 81.

The damping element 84 according to the present embodiment includes:
In superconducting ring form, it surrounds a second magnetic leg 83B having an inductive element formed of or filled with a material whose reluctance is greater than the reluctance of the magnetic core 88. In the structure of the transformer 85, the primary winding 82
And the secondary winding 86 can be on any part of the magnetic core except for the magnetic rug with the inductive element.

In such a configuration, the fault current is applied to the primary winding 82 or the secondary winding 86 and the magnetic core 88
Approaching saturation, a portion of the magnetic flux generated by the fault current and flowing through the magnetic legs 83A-83C is:
It flows out through the second magnetic leg 83B, which is offset by the damping element 84.

As a result, as described in the above-described embodiment, the magnetic core 88 does not reach the saturated state, so that there is no flow of unlimited fault current. That is, the increase in the transient fault current flowing to the transformer can be effectively controlled by using a magnetic core having an induction element and a damping element filled with a material having a high reluctance, and the transformer has a transient fault current. Not damaged by electric current.

In this embodiment, the damping element is preferably made of a superconducting material in order to maximize the magnetic flux cancellation properties. The damping element is, for example, copper (C
u) or a non-superconducting material such as aluminum (Al). However, the magnetic flux cancellation effect when using non-superconducting materials is significantly reduced compared to using superconducting materials due to the relatively high internal electrical resistance of the damping elements.

This damping element may have the form of, for example, one or more cylinders, rings, short-circuit coils, etc., provided that it can provide one or more closed magnetic paths for the current induced by the external magnetic flux. Can be assumed.

The size of the inductive element and the magnetic resistance of the material filling the inductive element are important design parameters for controlling the magnetic flux distribution characteristics between the magnetic legs, and control the current limiting characteristics of the present invention.

The inductors 75 and the second magnetic legs 78B and 83B of the transformer 85 shown in FIGS. 4 and 5 may be formed of a material having a large magnetoresistance as shown in FIG.

Although not described in the embodiments of the present invention, an element made of a superconducting material is used to maintain the superconducting state by using, for example, a low-temperature holding device using a coolant. It is well known to those skilled in the art that the temperature of the material should be reduced below the threshold temperature at which the superconducting state is maintained.

Thus, any of the well-known high or low temperature superconducting materials can be applied to the present invention, but the superconducting material used in the present invention has a threshold temperature of a coolant such as liquefied nitrogen. High-temperature superconducting materials that can be achieved using are more preferred.

Although the preferred embodiments of the present invention have been described, those skilled in the art can make various modifications within the scope of the present invention.

Therefore, according to the present invention, the superconducting current control device furthermore uses an induction element and a damping element which are packed with a material having a high magnetoresistance in the ordinary magnetic core, and determines that the magnetic core is saturated. There is an advantage that the current limiting characteristic of the superconducting current controller is further improved by delaying or preventing the delay. In addition, using a leg with an inductive element packed with a material with high magnetoresistance, compared to a leg with an air gap, reduced vibration, increased mechanical strength, easier adjustment of magnetoresistance ratio, easier installation of damping element, etc. The effect can be achieved.

[0080]

As described in detail above, according to the present invention, a magnetic core including a damping element and a leg having a portion made of or packed with a material whose magnetic resistance is greater than the resistance of the magnetic core is used. Thus, by solving the problem of core saturation by strengthening the magnetic core, it is possible to provide a superconducting current control device that removes the adjustment limit of the magnetic resistance in the conventional device and improves the current limiting characteristic.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a superconducting current control device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a superconducting current control device according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a superconducting current control device according to a third embodiment of the present invention.

FIG. 4 is a schematic diagram of an inductor according to the present invention.

FIG. 5 is a schematic diagram of a transformer according to the present invention.

FIG. 6 is a schematic diagram for explaining a magnetic flux canceling effect of a superconductor.

FIG. 7 is a schematic diagram showing an electric appliance to which a conventional superconducting current control device is applied.

FIG. 8 is a graph showing a magnetization curve of a magnetic core in the superconducting current control device.

[Explanation of symbols]

 5: Electrical equipment 10, 10A, 10B, 10C: Superconducting current control device 20, 70: External circuit 50, 60, 61, 76, 88, 130 ... Magnetic core 52, 72, 82, 110: Main winding 54, 120 ... superconducting element 55, 65 ... inducing element 56, 63, 66, 74, 84 ... damping element 57 ... second closed magnetic path 58A, 62A, 78A, 83A ... first magnetic leg 58B, 62B, 78B, 83B ... 2 Magnetic legs 58C, 62C, 78C, 83C Third magnetic leg 58D Upper yoke 58E Lower yoke 59 First closed magnetic circuit 75 Inductor 80 Power supply circuit 81 Load circuit 82 Primary winding 85 Transformer 86 ... Secondary winding 100 ... Superconductor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Jin Min-Soo 123-10 Samseong-dong, Gangnam-gu, Seoul, South Korea

Claims (13)

[Claims] 1. A superconducting current control device for limiting a current flowing in an electric circuit, comprising: a magnetically saturable core having a saturated state and an unsaturated state; and electrically connecting the core to the electric circuit; An input coil for passing a current through the core to generate a magnetic flux in the core, wherein the core includes a main magnetic path for passing all of the generated magnetic flux, and at least two magnetic paths. A first magnetic path of the two magnetic paths passes a first portion of the magnetic flux, and a second magnetic path passes a second portion of the magnetic flux to form a second portion of the magnetic flux. A superconducting current control device comprising a damping element for canceling at least a part of the core to prevent the core from becoming saturated. 2. The second magnetic path, wherein when the core is in the non-saturated state, the ratio of the second portion to the first portion of the magnetic flux is ignored, and the core is close to the saturated state. 2. The superconducting current control device according to claim 1, further comprising an inducing means for increasing the ratio in a case. 3. If the current flowing through the input coil falls within a predetermined range, a large part of the generated magnetic flux is canceled out, and if the current exceeds the predetermined range, a resistance is set. 3. The superconducting current control device according to claim 2, further comprising a superconducting unit that is in a state and increases impedance of the device. 4. The superconducting current control device according to claim 3, wherein said superconducting means is located on said main magnetic path or said first magnetic path. 5. The superconducting means comprises one or more rings,
The superconducting current control device according to claim 4, wherein the device has a form of a cylinder or a short-circuit coil. 6. The superconducting current control device according to claim 5, wherein the superconducting means is located inside or outside the input coil along the main magnetic path or the first magnetic path. . 7. A magnetic flux flowing through a magnetic path located along the main magnetic path or the first magnetic path and connected to a load circuit, the output coil being located along the main magnetic path or the first magnetic path. The superconducting current control device according to claim 2, wherein the electric power induced by the power supply is supplied to the load circuit. 8. The device according to claim 7, wherein the output coil is located along the main magnetic path or the first magnetic path.
3. The superconducting current control device according to claim 1. 9. The superconducting current control device according to claim 8, wherein the output coil is made of a superconducting or non-superconducting material. 10. The inducing means according to claim 1, wherein the magnetic resistance is the first resistance.
8. The superconducting current control device according to claim 2, wherein the superconducting current control device is made of a material larger than the magnetic resistance of the magnetic path. 11. The superconducting current control device according to claim 10, wherein said inducing means is made of a solid. 12. The superconducting current control device according to claim 10, wherein when the inducing means is made of a material other than a solid, the inducing means is firmly encapsulated by a solid object. 13. The method of claim 2, wherein the damping element is made of a superconducting or non-superconducting material and has the form of one or more rings, cylinders or shorted coils. 8. The superconducting current control device according to 7.