KR102724289B1 - SUPERCONDUCTING FAULT-CURRENT LIMITER MODULE and HIGH TEMPERATURE RESISTIVE TYPE DC FAULT-CURRENT LIMITER - Google Patents

Abstract

The superconducting current limiting module of the present invention comprises a tape winding structure in which a superconducting tape wire is wound in a low cylindrical shape; an internal lead to which one end of the superconducting wire forming the tape winding structure is connected and which is positioned on an inner surface of the low cylindrical shape; and an external lead to which the other end of the superconducting wire is connected and which is positioned on an outer surface of the low cylindrical shape. A plurality of SPC unit coils can be arranged in a toroidal or solenoidal shape.

Description

SUPERCONDUCTING FAULT-CURRENT LIMITER MODULE AND HIGH TEMPERATURE RESISTIVE TYPE DC FAULT-CURRENT LIMITER

The present invention relates to a reactance-utilizing high-temperature superconducting DC resistance-type current limiter, and more particularly, to a DC high-temperature superconducting resistance-type current limiter which reduces the peak value of a fault current by suppressing it by utilizing the high impedance of the inductance component of the module winding together with the resistance generated in a superconductor in the event of a fault by manufacturing the DC resistance-type current limiter in the form of a coil.

When a fault occurs in a power system, the fault current is cut off through a circuit breaker to protect power devices and equipment. When a fault occurs in the system, the relay determines the fault condition and sends a trip signal to the circuit breaker to open it. After receiving the trip signal, the circuit breaker opens the circuit breaker contacts through the driving device to cut off the current. At this time, arc current flows across both ends of the circuit breaker contacts, and if sufficient insulation conditions are not established, the fault current will continue to flow due to the arc current. In the case of an AC system, since the current passes the zero point at regular intervals, if the contact distance is sufficient, the arc current disappears at the moment it reaches the zero point, and the fault current is cut off. However, in the case of a DC system, it is very difficult to eliminate the arc current because there is no current zero point. Generally, in the case of 3000 V or less, DC fault current can be cut off through arc diffusion, but in the case of higher voltages, it is difficult to eliminate the arc current. Accordingly, it is necessary to implement a technology that creates and cuts off the current zero point like an AC system using various methods. As for DC blocking technologies implemented to date, as mentioned above, the reverse voltage method that diffuses the arc generated at the contact point, the resonance method that configures a separate resonant circuit to resonate and block the DC current, the reverse current method that charges a parallel capacitor in advance and blocks it by superimposing the current when a fault occurs by injecting it in the opposite direction to the arc current, and circuit breakers using power semiconductors that can be turned on/off are being developed.

Figure 1 is a graph illustrating the basic operating principle of a resistive superconducting current limiter.

A superconducting current limiter is a method that generates impedance and limits the fault current by utilizing the phase transition process of a superconductor when a fault current exceeding the critical current occurs in the event of an accident. It is generally applied to protect AC systems, and has no impedance during normal operation, so it does not affect the line. When an accident occurs, the fault current is limited (limited) within 1/4 cycle, and as soon as the line fault current exceeds the critical current value, the impedance is generated in the current limiter, so rapid system protection is possible. After the accident is over, the impedance automatically decreases and the superconductivity is restored to the normal operation state. Depending on the impedance injection method, superconducting current limiters are classified into resistive, saturated core, and magnetic shielding types. In the case of the resistive type current limiter, it directly uses the phase transition resistance of the superconductor generated by the fault current.

As described above, the resistive superconducting current limiter is a method that utilizes the phase transition characteristics inherent in superconductors, so it is structurally simple and has excellent current limiting characteristics. On the other hand, since it is a device that directly utilizes the phase transition (quench) resistance caused by transient currents exceeding the critical current, it is generally implemented in a composite method that uses reactors, switches, etc. for rapid recovery to a normal state after an accident, protection of the superconductor used in the current limiter, and input of flexible impedance.

The current limiting module form of a resistive type superconducting current limiter can vary, but it is commonly designed to have the smallest possible inductance. This is so that the superconducting current limiter does not add impedance to the system under normal current operation in an AC system, and therefore, both the wound and straight types are generally manufactured in a form that minimizes inductance generation. In the case of the wound type, since the winding itself has a physically large inductance, the current limiting module is generally manufactured in a non-inductive manner using a bifilar form, and in the case of the straight type, it is manufactured in a form that minimizes module inductance and reduces the magnetic field experienced by the superconductor through a meander shape arrangement, suppresses AC loss of the superconductor that may occur under normal operation, and increases wire efficiency.

However, most of the current limiters mentioned above were researched and developed for application to AC systems. However, since the resistive current limiter generates resistance to fault currents exceeding the critical current regardless of the size or shape of the fault current, it can also be applied to DC systems. However, most of the existing pure resistive current limiting modules are designed for application to AC systems, and they are manufactured with the goal of limiting current within the peak of the initial fault current (within 1/4 cycle), and since they are manufactured for the purpose of linking with protection systems such as AC circuit breakers, it can be said that research on suitable current limiting modules for DC environments is necessary.

In the case of a DC environment, since control/adjustment using the phase is not possible, adjustments are required to suit various conditions or environments using resistance or inductance values. This is also the case for current limiters that handle fault currents, but in the case of DC resistance-type current limiters using superconductors, it was very difficult to adjust the resistance or inductance by the superconductor forming the coil.

Republic of Korea Registration No. 10-1996514

The present invention seeks to provide an efficient superconducting type current limiting device for a direct current system.

The present invention aims to provide a high-temperature superconducting resistive current limiting device for DC that enables rapid protection of a fault DC system and reduces the peak value of fault current.

The present invention aims to provide a superconducting resistance-type current limiting device in which the inductance value or resistance value can be easily adjusted according to conditions.

A superconducting current limiting module according to one aspect of the present invention comprises: a tape winding structure in which a superconducting tape wire is wound in a low cylindrical shape; an internal lead to which one end of the superconducting wire forming the tape winding structure is connected and which is positioned on an inner surface of the low cylindrical shape; and an external lead to which the other end of the superconducting wire is connected and which is positioned on an outer surface of the low cylindrical shape. A plurality of SPC unit coils may be arranged in a toroidal or solenoidal shape.

Here, the SPC unit coils are divided into a forward rotation SPC unit coil in which the superconducting tape wire is wound in a clockwise direction from the inner lead to the outer lead, and a reverse rotation SPC unit coil in which the superconducting tape wire is wound in a counterclockwise direction from the inner lead to the outer lead, and when arranged in the shape of the toroid or solenoid, the forward rotation SPC unit coil and the reverse rotation SPC unit coil can be arranged alternately.

Here, when arranged in the shape of the toroid or solenoid, each SPC unit coil can be connected with its inner leads to its neighbors on one side, and with its outer leads to its neighbors on the other side.

Here, when arranged in the above toroidal or solenoid shape, two adjacent SPC unit coils can be connected with one inner lead and the other outer lead.

Here, the SPC unit coil may further include a center C-ring that forms a ring shape together with the inner lead and supports the inner surface of the tape winding structure; and two bobbin plates attached to both sides of the center C-ring in a plate shape.

A high-temperature superconducting resistance-type current limiting device for DC according to another aspect of the present invention may include a superconducting current limiting module configured by arranging a plurality of SPC unit coils in the form of tape windings in a toroidal shape, which forms a distribution path of a DC power source; and a DC circuit breaker block which blocks a circuit when the superconducting current limiting module has high resistance and forms a path for consuming fault current.

Here, the SPC unit coil may include a tape winding structure in which a superconducting tape wire is wound in a low cylindrical shape; an internal lead to which one end of the superconducting wire forming the tape winding structure is connected and which is positioned on an inner surface of the low cylindrical shape; and an external lead to which the other end of the superconducting wire is connected and which is positioned on an outer surface of the low cylindrical shape.

By implementing a high-temperature superconducting resistance-type current limiting device for direct current according to the invention of the above-described configuration, there is an advantage in that rapid protection of a faulty direct current system is possible while reducing the peak value of the fault current.

The superconducting current limiting module of the present invention has the advantage of making it easy to adjust the inductance value or resistance value according to conditions when configuring a current limiting device such as a high-temperature superconducting resistive current limiting device for direct current.

Figure 1 is a graph illustrating the basic operating principle of a resistive superconducting current limiter.
Figure 2 illustrates the basic form of an impedance-utilizing DC resistive current limiter using a superconducting current limiting module according to the idea of the present invention.
FIG. 3 is a perspective view illustrating the detailed configuration of an SPC unit coil (100) that is arranged in a plurality of toroidal or solenoidal shapes to form a superconducting current limiting module according to one embodiment of the present invention in an isolated state.
FIG. 4 is an enlarged view of the combined outer and inner lead and outer lead portions of the SPC unit coil (100) of FIG. 3.
FIG. 5 is a perspective view illustrating a superconducting current limiting module (1000) according to one embodiment of the present invention in which the SPC unit coils (100) of FIG. 3 are arranged in a toroidal shape.
FIG. 6a is a cross-sectional view illustrating an example of an electrical connection configuration of SPC unit coils arranged in a toroidal shape of FIG. 5, and FIG. 6b is a perspective view illustrating the connected appearance.
FIG. 7 is a cross-sectional view illustrating another embodiment of the electrical connection configuration of SPC unit coils arranged in a toroidal shape of FIG. 5.
FIG. 8 is a cross-sectional view illustrating another embodiment of the electrical connection configuration of SPC unit coils arranged in a toroidal shape of FIG. 5.
Figure 9 illustrates the layout structure and equivalent circuit of a toroidal resistive superconducting current limiting module.
Figure 10 is a graph showing the critical characteristics of the toroidal resistive superconducting current limiting module winding proposed by the present invention.
Figure 11 is a graph showing the results of system application analysis of the toroidal resistive superconducting current module winding proposed by the present invention.
Fig. 12 is a circuit diagram illustrating a high-temperature superconducting resistance-type current limiting device for direct current using a superconducting current limiting module according to the idea of the present invention.

In describing the present invention, terms such as first, second, etc. may be used to describe various components, but the components may not be limited by the terms. The terms are only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

When it is said that a component is connected or coupled to another component, it can be understood that it may be directly connected or coupled to that other component, but there may also be other components in between.

The terminology used in this specification is only used to describe specific embodiments and is not intended to limit the invention. The singular expression may include the plural expression unless the context clearly indicates otherwise.

In this specification, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, and can be understood as not excluding in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Additionally, the shape and size of elements in the drawing may be exaggerated for clearer explanation.

The present invention proposes a superconducting current limiting module that can be conveniently used, particularly, to construct a DC type high-temperature superconducting resistance type current limiting device.

Fig. 2 illustrates the basic form of an impedance-utilizing DC resistive current limiter using a superconducting current limiting module according to the idea of the present invention. As illustrated, the superconducting current limiting module (1000) forms a power transmission path supplied from a DC power source (1) to a load (3), and can be viewed as an inductor and a variable resistor. In the event of an accident, the variable resistance increases rapidly compared to the line resistance (2), so that the power transmission path can be substantially blocked.

The above superconducting current limiting module operates by suppressing the fault current by utilizing the resistance of the superconducting wire and the inductance of the coil constituting the current limiting module, which are generated by the fault current exceeding the critical current when a fault occurs. Therefore, since it is possible to generate high impedance by utilizing the inductance of the module coil when a fault occurs, it has better initial fault current limiting characteristics than the existing purely resistive type current limiter.

In the present invention, a tape-shaped (i.e., very long rectangular strip-shaped) superconducting wire having excellent cost-effectiveness and easy manufacturing process application is applied to construct a superconducting current limiting model with excellent efficiency and adaptability. The superconducting current limiting module according to the above-described concept is composed of a plurality of SPC unit coils arranged in a toroidal or solenoidal shape.

FIG. 3 is a perspective view illustrating the detailed configuration of an SPC unit coil (100) that is arranged in a plurality of toroidal or solenoidal shapes to form a superconducting current limiting module according to one embodiment of the present invention in an isolated state.

FIG. 4 is an enlarged view of the combined outer and inner lead and outer lead portions of the SPC unit coil (100) of FIG. 3.

The SPC unit coil (100) described above comprises a tape winding structure (10) in which a superconducting tape wire is wound in a low cylindrical shape; an internal lead (20) to which one end of the superconducting wire forming the tape winding structure (10) is connected and which is positioned on an inner surface of the low cylindrical shape; and an external lead (30) to which the other end of the superconducting wire is connected and which is positioned on an outer surface of the low cylindrical shape.

The above tape winding structure (10), the inner lead (20) and the outer lead (30) are components forming a unit superconducting coil, and as components for mechanically supporting them, the SPC unit coil (100) may further include a center C-ring (40) forming a ring shape together with the inner lead (20) and supporting the inner surface of the tape winding structure; and two bobbin plates (51, 52) attached to both sides of the center C-ring in a plate shape.

As shown in the enlarged portion of Fig. 4, the tape winding structure (10) forms a low cylindrical cylindrical surface in which the superconducting tape wire is rolled several times in a band shape like a packaging tape product. One end of the low cylindrical superconducting tape wire is electrically connected to an inner lead (20), and the other end thereof is electrically connected to an outer lead (30). Depending on the implementation, the low cylindrical superconducting tape wire may be rolled in a state in which an insulating layer is covered to block interlayer current leakage of the low cylindrical superconducting tape wire.

FIG. 5 is a perspective view illustrating a superconducting current limiting module (1000) according to one embodiment of the present invention in which the SPC unit coils (100) of FIG. 3 are arranged in a toroidal shape.

The superconducting current limiting module (1000) according to the idea of the present invention has a toroidal coil shape in which the illustrated SPC unit coils (100) are arranged in a toroidal shape, and when used for direct current, it does not generate impedance in the system during normal operation. In addition, due to the structural characteristics of the toroidal coil in the form of a module, it is possible to utilize the critical current of a high superconducting wire due to a low vertical magnetic field, and since the magnetic field environment experienced by all the superconducting coils constituting the toroid is uniform, it is suitable for series and parallel configurations of the coils, and it is a structure that is advantageous for simultaneous phase transition of all coils in the event of an accident. In addition, since the leakage magnetic field generated by the coils during normal operation is small due to the toroidal structure in which the magnetic field circulates, it is possible to minimize the influence of the surroundings when installing the current limiting module.

In other words, the superconducting current limiting module for DC proposed in the present invention is a toroidal shape composed of SPC unit coils (100), which are high-temperature superconducting single pancake module coils, and each single pancake coil constituting the toroid is configured in a series/parallel connection shape so as to have a parallel number according to the demand for the rated current of the system and a length for generating resistance required during current limiting, and the coils can be designed in a shape capable of generating impedance according to the demand for the applied DC system through various combinations of series/parallel shapes.

FIG. 6a is a cross-sectional view illustrating an example of an electrical connection configuration of SPC unit coils arranged in a toroidal shape of FIG. 5, and FIG. 6b is a perspective view illustrating the connected appearance.

When arranged in a toroidal shape in the drawing, each SPC unit coil is connected to its inner leads on one side and to its outer leads on the other side.

In the case of a city connection, if all SPC unit coils are composed of only one type, the magnetic field directions are formed in opposite directions as the current directions of the SPC unit coils alternate, thereby reducing the inductance imparting effect.

In order to increase the inductance effect in the illustrated connection structure, the SPC unit coils are divided into a forward rotation SPC unit coil (100-1) in which the superconducting tape wire is wound in a clockwise direction from the inner lead to the outer lead, and a reverse rotation SPC unit coil (100-2) in which the superconducting tape wire is wound in a counterclockwise direction from the inner lead to the outer lead, and when arranged in the toroidal shape, the forward rotation SPC unit coil (100-1) and the reverse rotation SPC unit coil (100-2) can be arranged alternately.

Meanwhile, the superconducting current limiting module according to the invention of the present invention can be applied in the form of a non-inductive coil, as in the case of a general AC pure resistance type current limiting module, by configuring all SPC unit coils with only one type. This is to avoid adding impedance to the system in the normal operating state as described above, and additionally to suppress the AC loss of the current limiting module occurring in the normal operating state while miniaturizing the size of the current limiting module, and to utilize the critical current of the high superconducting wire by lowering the size of the external magnetic field.

FIG. 7 is a cross-sectional view illustrating another embodiment of the electrical connection configuration of SPC unit coils arranged in a toroidal shape of FIG. 5.

In the illustrated connection structure, when arranged in a toroidal shape, two neighboring SPC unit coils have a form in which one inner lead is connected to the other outer lead. Therefore, in this case, even if all the SPC unit coils are composed of only one type, they all have current rotation in the same direction, so that inductance can be secured.

FIG. 8 is a cross-sectional view illustrating another embodiment of the electrical connection configuration of SPC unit coils arranged in a toroidal shape of FIG. 5.

The illustrated connection structure is intended to explain the principle of inductance adjustment when the inductance must be adjusted according to the needs of the installation location or environment where the superconducting current limiting module, in which all SPC unit coils are composed of only one type, is installed.

In the drawing, the current rotation is the same in area A, while the current rotation is alternate in area B. That is, as the proportion of area A increases, the inductance increases, and as the proportion of area B increases, the inductance decreases. Accordingly, the inductance can be adjusted to the location or environment where the superconducting current limiter module is installed. In the case of the illustrated implementation, since there is some resistance change, the calculation becomes somewhat complicated when applied to a DC current limiter, but it can be suitably used as an AC current limiter in a field where inductance adjustment is important.

The superconducting current limiting module according to the invention described above can be manufactured in a simple, general single pancake winding form, compared to the non-inductive windings that were mainly used to manufacture the existing resistive current limiter, and is electrically stable because less voltage is generated between each turn due to the series form for toroidal arrangement, and is advantageous in miniaturization through insulation minimization.

From the perspective of application flexibility, since the combination of series/parallel wires that make up the module can be very diverse, it is possible to manufacture coils that generate the same resistance and have various inductances, so that it can flexibly respond to changes in the current limiter specifications and system requirements. In addition, it has the advantage of being able to be repaired without replacing the entire system by replacing the module even if a problem such as damage inside the element occurs.

From a manufacturing perspective, in the case of superconducting wires, the longer the unit length, the higher the price, and in the case of long-length conductors, it is not possible to guarantee uniform resistance generation characteristics in the longitudinal direction. Therefore, when using short unit wires like this module, it is advantageous for relatively uniform wire characteristics, and it is advantageous for securing economic feasibility of module manufacturing through reduction in wire price.

Figure 9 illustrates the layout structure and equivalent circuit of a toroidal resistive superconducting current limiting module.

The superconducting current limiting module of the city is a toroidal coil consisting of 60 single pancake coils with an inner diameter of 30 mm, 10 series pancake coils connected to generate resistance that satisfies the operation of a resistance-type current limiter, and 6 parallel-connected coil sets determined by the rated current.

It can have a toroidal shape using a second-generation high-temperature superconducting wire, and in this case, a structure can be formed by manufacturing a large number of single pancake module coils suitable for tape-shaped superconducting wires and arranging them in a toroidal shape.

Resistive current limiting modules require multiple parallel connections for smooth operation in normal conditions according to the rated capacity of the applicable system, and generally require a long wire length to create the optimal size of the resistance required for fault current limitation. Since toroidal coils have the same electromagnetic characteristics as all single pancake coils, it is possible to manufacture them to have a certain critical characteristic of the resistive current limiting module that requires multiple series-parallel types structurally, and various structures with the same resistance generation length can be created through various series-parallel combinations. Therefore, it is a flexible structure that allows the design of a suitable coil shape that meets various system requirements, such as the critical current of the superconducting wire, the resistance required to be generated during a fault, unit length, the number of pancake coils, the size of the current limiting module, and the optimal impedance generation during a DC system fault.

Figure 10 is a graph showing the critical characteristics of the toroidal resistive superconducting current limiting module winding proposed by the present invention.

As shown in the figure, the maximum vertical magnetic flux density experienced by the superconducting wires constituting the current-limiting module is approximately 0.5 T, and at this time, the critical current of the superconducting wires is approximately 700 A at the operating temperature of 69 to 70 K of the current-limiting module, which satisfies the DC rated operating condition when considering the parallel number. At this time, the inductance of the current-limiting module is approximately 22.49 mH, which has the advantage of being utilized to increase the impedance together with the resistance generated in the current-limiting module in the event of an accident.

Figure 11 is a graph showing the results of system application analysis of the toroidal resistive superconducting current module winding proposed by the present invention.

As a result of the illustrated interpretation, it can be confirmed that the initial current suppression characteristics of a fault are superior to those of a purely resistive current-limiting module due to its high impedance, and that the current-limiting operation time up to a temperature limit of 250 K is also longer than that of a purely resistive type. As a result of the interpretation, the proposed current-limiting module utilizing the inductance of the current-limiting module can suppress relatively rapid initial changes in fault current compared to a purely resistive current-limiting module, and exhibits excellent current-limiting characteristics with a long current-limiting duration, making it suitable for connection with active system protection devices such as circuit breakers after a fault.

Fig. 12 is a circuit diagram illustrating a high-temperature superconducting resistance-type current limiting device for direct current using a superconducting current limiting module according to the idea of the present invention.

A high-temperature superconducting resistance-type current limiting device for direct current may include a superconducting current limiting module (1000) which forms a distribution path of a direct current power source and is configured by arranging a plurality of SPC unit coils in the form of tape windings in a toroidal shape, and a DC circuit breaker block (2000) which blocks a circuit when the superconducting current limiting module has high resistance and forms a path for consuming fault current.

The above superconducting current limiting module (1000) may have a form in which SPC unit coils are stacked in a toroidal shape as shown in FIG. 3.

In order to protect a DC system, it is necessary to suppress the fault current through a current limiter and also to block the system appropriately. In the case of a DC system, unlike an AC system, the fault current does not cross the origin moment, so it is not easy to block it, and the difficulty of blocking increases as the fault current increases. Therefore, as shown in the drawing, if a superconducting current limiting module (1000) that limits the fault current and a DC blocking block (2000) are appropriately connected and used to block a very large fault current, the size of the current to be blocked by the DC blocking block (2000) is reduced, so that the specifications required for the DC blocking block (2000) can be reduced and it can be utilized to configure a more efficient blocking linkage system.

Since the superconducting current limiting module (1000) has a low fault current generation characteristic by suppressing the initial growth of fault current at the beginning of a fault, the DC blocking block (2000) can be turned on more quickly, and since the operating time of the superconducting current limiting module (1000) is longer than that of a pure resistive current limiter, it has time flexibility that allows the grid protection system, such as the turning on of the DC blocking block (2000) and/or other circuit breakers, to be linked.

In addition, when using a current limiter for a circuit breaker-linked system such as the above as a pure resistance-type current limiter, a low-stability wire such as a superconducting wire without a stabilizing layer must be used because a fast resistance generation characteristic is required in the event of an accident. However, in the illustrated superconducting current limiting module (1000), a relatively highly stable superconducting wire is selected and manufactured, and since impedance can be quickly generated through the use of inductance, a module with a higher stability can be manufactured.

Those skilled in the art should understand that the present invention can be implemented in other specific forms without changing the technical idea or essential characteristics thereof, and that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the claims described below rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

10: Tape winding structure
20 : Inner Lead
30 : External Lead
40 : Center C-ring
51, 52 : Bobbin plate
100 : SPC Unit Coil
1000 : Superconducting Current Module
2000: DC Block Block

Claims (7)

A tape winding structure in which a superconducting tape wire is wound into a low cylindrical shape;
An internal lead, wherein one end of the superconducting tape wire forming the tape winding structure is connected and is located on the inner surface of the low cylindrical shape; and
A plurality of SPC unit coils having external leads positioned on the outer surface of the low cylindrical shape and connected to the other end of the superconducting tape wire are arranged in the form of a toroid or solenoid,
The above SPC unit coil is,
A central C-ring that forms a ring shape with the above inner lead and supports the inner surface of the tape winding structure; and
Two bobbin plates attached to both sides of the central C-ring in the form of a plate
A superconducting current limiting module further comprising:
In the first paragraph,
The above SPC unit coils are divided into a forward rotation SPC unit coil in which the superconducting tape wire is wound in a clockwise direction from the inner lead to the outer lead, and a reverse rotation SPC unit coil in which the superconducting tape wire is wound in a counterclockwise direction from the inner lead to the outer lead.
A superconducting current limiting module in which the forward-rotating SPC unit coils and the reverse-rotating SPC unit coils are arranged alternately when arranged in the above toroidal or solenoid shape.
In paragraph 1 or 2,
A superconducting current limiting module in which, when arranged in the shape of the above toroid or solenoid, each of the above SPC unit coils is connected between the inner leads to one neighbor and between the outer leads to the other neighbor.
In the first paragraph,
A superconducting current limiting module in which two adjacent SPC unit coils, when arranged in the above toroidal or solenoidal shape, are connected by one inner lead and the other outer lead.
delete A superconducting current limiting module comprising a plurality of tape-wound SPC unit coils arranged in a toroidal shape, which forms a distribution path for a direct current power source; and
A DC circuit blocking block that blocks the circuit when the above superconducting current limiting module has high resistance and forms a path for the consumption of fault current.
Including,
The above SPC unit coil is,
A tape winding structure in which a superconducting tape wire is wound into a low cylindrical shape;
An internal lead connected to one end of the superconducting wire forming the tape winding structure and positioned on the inner surface of the low cylindrical shape; and
An external lead connected to the other end of the superconducting wire and positioned on the outer surface of the low cylindrical shape;
A central C-ring forming a ring shape with the above inner lead and supporting the inner surface of the tape winding structure;
Two bobbin plates attached to both sides of the central C-ring in the form of a plate
A high-temperature superconducting resistive current limiting device for direct current including:
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