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KR20030062597A - High-Tc Superconducting Fault Current Limiter Controlling Amplitude of the Applied Magnetic Field Using Power Switch - Google Patents

High-Tc Superconducting Fault Current Limiter Controlling Amplitude of the Applied Magnetic Field Using Power Switch Download PDF

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KR20030062597A
KR20030062597A KR1020020002861A KR20020002861A KR20030062597A KR 20030062597 A KR20030062597 A KR 20030062597A KR 1020020002861 A KR1020020002861 A KR 1020020002861A KR 20020002861 A KR20020002861 A KR 20020002861A KR 20030062597 A KR20030062597 A KR 20030062597A
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magnetic field
high temperature
temperature superconducting
winding
power switch
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KR100501802B1 (en
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한병성
이성룡
임성훈
강형곤
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한병성
이성룡
임성훈
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of DC component by short circuits in AC networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

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Abstract

PURPOSE: A high-temperature superconduction current limiter capable of controlling the quantity of an applied magnetic field using a power switch is provided to increase the breaking capacity by controlling the quantity of magnetic field applied to a high-temperature superconduction device to control the quantity of accidental current. CONSTITUTION: A first winding is wound to an iron core and a second winding is connected to the same core. A high temperature superconduction bulk or a thin film device is connected in serial to the second winding. An electric wave rectifying circuit is comprised of a separate third winding installed on the same core where the first and the second windings are wound and a diode for rectifying a voltage induced to the third winding. A magnetic field applying coil is connected in serial to the electric wave rectifying circuit connected to the third winding. The diode and a resistor are connected in serial to the magnetic field applying coil. A power switching device is branched between the magnetic field applying coil and the diode to include an inverse-parallel diode connected in parallel to the electric wave rectifying circuit.

Description

전력용 스위치를 이용하여 인가 자계의 크기조절이 가능한 고온초전도 전류 제한기{High-Tc Superconducting Fault Current Limiter Controlling Amplitude of the Applied Magnetic Field Using Power Switch}High-Tc Superconducting Fault Current Limiter Controlling Amplitude of the Applied Magnetic Field Using Power Switch}

본 발명은 전력용 스위치를 이용한 인가자계의 크기조절 기능을 갖는 고온초전도 전류제한기에 관한 것이다.The present invention relates to a high temperature superconducting current limiter having a size control function of an applied magnetic field using a power switch.

고온초전도체를 이용한 전류제한기는 매년 증가되고 있는 전력요구와 전력공급으로 인한 전력계통의 용량증가로 기존의 차단기의 용량증가와 성능향상을 위해 발생되는 추가비용을 줄일 수 있는 장점으로 인해 다양한 모델이 개발되어 일부는 상용화를 위한 현장시험을 마친 상태이다. 그러나 고온초전도 한류기와 같이 대전력에 적용하기 위해 해결해야 할 가장 중요한 과제중의 하나는 고임계 특성을 갖는 고온초전도체의 제조기술을 들 수 있다. 이러한 고온초전도체를 이용한 한류기에적용시 고온초전도체 제작에 따른 재료적인 제약으로 인한 문제점을 해결할 수 있는 방안으로 새로운 구조를 갖는 토폴로지 개발이 요구되고 있으며 사고와 동시에 고온초전도체의 상전도 저항을 높이기 위한 방안이 모색되고 있다.The current limiter using high temperature superconductor has developed various models due to the increased power demand and increasing capacity of power system due to power supply, which can reduce the additional cost incurred to increase capacity and improve performance of existing circuit breakers. Some of them have been field tested for commercialization. However, one of the most important problems to be solved for high power applications, such as high temperature superconducting fault current limiters, is the manufacturing technology of high temperature superconductors having high critical characteristics. In order to solve the problems caused by the material constraints caused by the production of high temperature superconductors when applied to the current-limiting device using high temperature superconductors, it is required to develop a topology with a new structure and to improve the phase conduction resistance of the high temperature superconductors. It is being sought.

본 발명은 자계인가 코일이 설치된 3차측 권선에 도통되는 전류를 제어함으로서 기존의 사고제거 후 문제점을 해결할 뿐 아니라 인가자계의 크기를 조정함으로서 사고시 제한되는 전류의 크기를 제어하고자 함이다. 이를 위해서 고주파로 동작되는 전력용 스위치소자로 구성된 컨버터회로를 자계인가 코일이 설치된 3차측 권선에 도입하여 듀티비를 제어함으로서 가능하며(도 1 참조), 소프트스위칭을 적용할 수 있는 보조회로를 도입(도 5 참조)함으로서 제안한 자계인가를 위한 컨버터회로의 효율 향상을 꾀하고자 한다.The present invention is intended to control the amount of current limited in an accident by adjusting the size of the applied magnetic field as well as solving the problem after eliminating the existing accident by controlling the current conducted to the tertiary winding in which the magnetic field applying coil is installed. To this end, a converter circuit composed of a power switching element operated at a high frequency is introduced into a tertiary winding in which a magnetic field applying coil is installed to control the duty ratio (see FIG. 1), and an auxiliary circuit to which soft switching can be applied is introduced. (See FIG. 5), the efficiency of the converter circuit for applying the proposed magnetic field is to be improved.

[도 1]은 본 발명에서 제안한 전력용 스위치를 이용한 인가자계의 크기조절기능을 갖는 고온초전도 전류제한기의 구조.1 is a structure of a high temperature superconducting current limiter having a size control function of an applied magnetic field using a power switch proposed in the present invention.

[도 2]는 자계인가 코일과 고온초전도 소자의 구성도.2 is a configuration diagram of a magnetic field applying coil and a high temperature superconducting element.

[도 3]은 고온초전도체 시편에 인가되는 자계크기에 따른 상전도 상태의 저항관계를 개념적으로 보여주는 곡선.Figure 3 is a curve conceptually showing the resistance relationship of the phase conduction state according to the magnetic field size applied to the high temperature superconductor specimen.

[도 4]는 자계인가 코일에 흐르는 전류크기에 비례하여 발생되는 상전도 저항크기( Rsc= 5, 10, 20 [Ohm] )에 따라 사고시 제한되는 선로전류 파형(IFCL).4 is a line current waveform (I FCL ) limited in case of an accident according to the phase conduction resistance magnitude (R sc = 5, 10, 20 [Ohm]) generated in proportion to the current flowing in the magnetic field applying coil.

[도 5]는 제안한 전력용 스위치를 포함한 3차권선에 연결된 자계인가 회로의 효율향상을 위해 소프트스위칭(Soft Switching)동작을 위해 보조회로(Sa, LrCr, Dr)를 추가한 예. (a)는 영전류 스위칭(ZCS, Zero Current Switching)동작을 위한 보조회로를 추가한 회로 예, (b)는 영전압 스위칭(ZVS, Zero Voltage Switching)동작을 위한 보조회로를 추가한 회로 예.FIG. 5 illustrates the addition of auxiliary circuits (S a , L r C r , D r ) for soft switching to improve the efficiency of the magnetic field application circuit connected to the tertiary winding including the proposed power switch. Yes. (a) is a circuit example in which an auxiliary circuit for zero current switching (ZCS) operation is added, and (b) is a circuit example in which an auxiliary circuit is added for zero voltage switching (ZVS) operation.

<도면의 주요부분에 대한 간단한 설명 ><Brief description of the main parts of the drawings>

RSC: 고온초전도소자의 인가자계에 따른 상전도 저항R SC : Phase conduction resistance according to applied magnetic field of high temperature superconducting element

Rn1: 자계인가 코일에서 (Φ1자속 인가시 고온초전도 소자에서 발생되는 상전도 저항R n1 : In a magnetic field applying coil (phase conduction resistance generated in high temperature superconducting element when Φ 1 magnetic flux is applied)

Rn2: 자계인가 코일에서 Φ2자속 인가시 고온초전도 소자에서 발생되는 상전도 저항R n2 : Phase conduction resistance generated in high temperature superconducting element when Φ 2 magnetic flux is applied in magnetic field applying coil

Rn3: 자계인가 코일에서 Φ3자속 인가시 고온초전도 소자에서 발생되는 상전도 저항R n3 : Phase conduction resistance generated in high temperature superconducting element when Φ 3 magnetic flux is applied in magnetic field applying coil

V1: 1차측 권선에 인가된 전압V 1 : Voltage applied to the primary winding

V2: 2차측 권선에 인가된 전압V 2 : Voltage applied to the secondary winding

V3: 3차측 권선에 유기된 전압V 3 : Induced voltage in the tertiary winding

I1: 1차측 권선에 도통되는 전류I 1 : Current conducted to the primary winding

I2: 2차측 권선에 도통되는 전류I 2 : Current conducted to the secondary winding

I3: 3차측 권선에 도통되는 전류I 3 : Current conducted to the tertiary winding

IS: 고온초전도 소자에 도통되는 전류(=I2)I S : Current conducted to the high temperature superconducting element (= I 2 )

IFCL: 사고시 선로전류(I1+I2)I FCL : Line current in case of accident (I 1 + I 2 )

IC: 고온초전도 소자의 임계전류I C : Critical current of high temperature superconducting element

Sm: 3차측 권선의 전력용 메인 스위치S m : Main switch for power of tertiary winding

Lr: 공진용 인덕터L r : Resonance Inductor

Cr: 공진용 커패시터C r : resonant capacitor

Dr: 보조 다이오드D r : auxiliary diode

Do: 3차측 권선의 출력단 다이오드D o : Output stage diode of the tertiary winding

Ro: 3차측 권선의 출력저항R o : Output resistance of the tertiary winding

Sa: 보조 스위치S a : auxiliary switch

본 발명에 의한 전력용 스위치로 구성된 인가자계의 크기조절기능을 갖는 고온초전도 전류제한기의 구성은 다음과 같다. 즉 교류전원과 부하에 연결될 철심코어에 결선된 1차측 권선과,The configuration of the high temperature superconducting current limiter having a size control function of an applied magnetic field composed of a power switch according to the present invention is as follows. That is, the primary winding connected to the iron core core to be connected to the AC power and the load,

상기 교류전원과 부하에 연결되며, 상기 1차측 권선과 병렬로 가극성 또는 감극성으로 상기 철심코어에 연결되는 2차측 권선과,A secondary side winding connected to the AC power supply and a load, the secondary winding connected to the iron core core in a polarity or polarity in parallel with the primary winding;

상기 2차측 권선과 직렬로 연결되는 고온초전도 소자와,A high temperature superconducting element connected in series with the secondary winding;

상기 1차측 및 2차측 권선이 권선된 상기 동일코어에 설치된 별도의 3차측 권선과,A separate tertiary side winding installed on the same core in which the primary and secondary windings are wound;

사고시 상기 3차측 권선에 유기된 전압을 정류하기 위한 다이오드로 구성된 전파정류회로와,A full-wave rectifier circuit composed of a diode for rectifying the voltage induced in the tertiary winding in an accident;

사고시 상기 2차측 권선에 연결된 상기 고온초전도 소자에 자계를 인가하기위해 상기 고온초전도 소자를 내부에 통과되도록 공심형으로 결선되며(도 2 참조)상기 정류회로와 직렬로 연결되는 자계인가 코일과,A magnetic field applying coil connected in series with the rectifying circuit in a concentric manner so as to pass the high temperature superconducting element therein in order to apply a magnetic field to the high temperature superconducting element connected to the secondary winding in case of an accident;

상기 전파정류회로와 연결되며, 상기 자계인가 코일과 직렬로 연결되는 다이오드와 저항과,A diode and a resistor connected to the full-wave rectifying circuit and connected in series with the magnetic field applying coil;

상기 자계인가 코일과 다이오드사이에서 분기되어 상기 전파정류회로와 병렬로 연결되는 역병렬 다이오드를 포함한 전력용 스위칭소자를 포함하여 구성된다.And a power switching element including an anti-parallel diode which is branched between the magnetic field applying coil and the diode and connected in parallel with the full-wave rectifying circuit.

이때, 전력용 스위칭소자의 듀티비를 제어함으로서 고온초전도 소자에 인가되는 자계의 크기를 제어할 수 있다.In this case, the magnitude of the magnetic field applied to the high temperature superconducting element may be controlled by controlling the duty ratio of the power switching element.

본 발명에 의한 사고시 전력용 스위치를 이용한 인가자계의 크기조절 방법을 설명하면 다음과 같다.Referring to the method of adjusting the size of the applied magnetic field using the power switch at the time of the accident according to the present invention.

사고발생 전에 2차측 권선에 직렬 연결된 고온초전도 소자의 저항은 영이 되며, 이로 인해 1차측 권선과 2차측 권선에 인가되는 전압의 크기는 동일하게 된다. 이때 자계인가 코일이 연결되며 동일코어에 결선된 3차측 권선에 유기되는 전압은 영이 되어 자계인가 코일에는 전류가 흐르지 않게 된다. 사고가 발생되어 부하가 단락되면 1차측 권선과 2차측 권선에 흐르는 전류의 크기는 커지게 되며 이때 2차측 권선에 연결된 고온초전도 소자의 임계전류값을 넘게 되어 고온초전도 소자의 저항이 발생되어 더 이상 1차측 권선과 2차측 권선의 양단전압이 같지 않게 된다.이때 1차측 권선과 2차측 권선에 인가되는 전압크기 차만큼 동일코어에 권선된 3차측 권선에 전압이 유기되며 3차측 권선에 유기된 전압으로 인해 자계인가 코일에 전류가 흐르게 되어 고온초전도 소자에 자계를 인가하게 된다. 이때, 인가된 자계로 인해 고온초전도 소자의 상전도 저항값은 보다 큰 값으로 증가되며 이는 사고시 선로전류의 크기가 보다 감소되는 효과를 갖게 된다. 이는 사고시 제안한 고온초전도 전류제한기의 등가회로로부터 구한 선로전류의 값으로부터 확인할 수 있다. 이때 본 발명에 의한 대전력용 스위칭소자의 듀티비를 일정한 값으로 설정함으로서, 사고시 자계인가 코일에 흐르는 전류의 크기를 제어할 수 있게 되고 이는 2차측 권선에 연결된 고온초전도 소자에 인가되는 자계의 크기를 제어하게 되므로, 인가 자계의 크기에 따른 고온초전도 소자의 상전도 저항값을 조절할 수 있게 되어 사고로인해 선로에 흐르는 전류의 크기를 제어할 수 있게 된다.Before the accident, the resistance of the high temperature superconducting element connected in series with the secondary winding becomes zero, which causes the voltage applied to the primary winding and the secondary winding to be the same. At this time, the magnetic field applying coil is connected and the voltage induced in the tertiary winding connected to the same core becomes zero so that no current flows in the magnetic field applying coil. If an accident occurs and the load is short-circuited, the current flowing in the primary winding and the secondary winding becomes large.At this time, the threshold current value of the high temperature superconducting element connected to the secondary winding is exceeded, and the resistance of the high temperature superconducting element is generated. The voltage between both ends of the primary and secondary windings is not the same, at which time the voltage is induced in the tertiary winding wound on the same core by the difference in voltage magnitude applied to the primary and secondary windings, and the voltage induced in the tertiary winding. As a result, a current flows through the magnetic field applying coil to apply the magnetic field to the high temperature superconducting element. At this time, the phase conduction resistance value of the high temperature superconducting element is increased to a larger value due to the applied magnetic field, which has the effect of reducing the magnitude of the line current in case of an accident. This can be confirmed from the value of the line current obtained from the equivalent circuit of the high temperature superconducting current limiter proposed in case of accident. At this time, by setting the duty ratio of the switching device for a large power according to the present invention to a constant value, it is possible to control the magnitude of the current flowing through the magnetic field or coil in case of an accident, which is the magnitude of the magnetic field applied to the high temperature superconducting element connected to the secondary winding Since it is possible to control, the phase conduction resistance value of the high-temperature superconducting device according to the magnitude of the applied magnetic field can be adjusted to control the magnitude of the current flowing in the line due to an accident.

첨부한 도면들을 참조한 본 발명의 상세 설명은 다음과 같다.Detailed description of the invention with reference to the accompanying drawings is as follows.

[도 1]은 본 발명이 구현하고자 하는 전력용 스위치를 이용한 인가자계의 크기조절 기능을 갖는 고온초전도 전류제한기의 구조를 나타내는 대표도이다. 1차측권선과 2차측 권선은 서로 병렬로 동일코어에 결선되며 사고발생시 3차측 권선에 전압이 유기됨으로서 고온초전도 소자를 내부에 설치되도록 결선된 자계인가 코일에 전류가 흐르게 되어 고온초전도 소자에 자계를 인가하게 된다. 이때 3차측 권선의 자계인가 코일을 포함한 회로의 전력용 스위치의 듀티비를 조절함으로서 인가자계의 크기를 제어할 수 있다.1 is a representative view showing a structure of a high temperature superconducting current limiter having a size control function of an applied magnetic field using a power switch to implement the present invention. The primary winding and the secondary winding are connected to the same core in parallel with each other.In case of an accident, the voltage is induced in the tertiary winding, so that a current flows through the magnetic field applied coil installed to install the high temperature superconducting element inside, thereby applying a magnetic field to the high temperature superconducting element. Will be authorized. At this time, the magnitude of the applied magnetic field can be controlled by adjusting the duty ratio of the power switch of the circuit including the magnetic field applying coil of the tertiary winding.

[도 2]는 3차측 권선에 연결될 자계인가코일과 2차측 권선에 연결될 고온초전도 소자의 실제 구성도를 나타내며, a, b는 2차측 권선에, c, d는 3차측 권선에 연결된다. 사고전에는 자계인가 코일에는 전류가 도통하지 않으므로 고온초전도 시편에 자계인가가 이루어지지 않지만, 사고발생과 함께 고온초전도 시편에 외부자계가 인가되는 구조이다.2 shows an actual configuration diagram of the magnetic field applying coil to be connected to the tertiary winding and the high temperature superconducting element to be connected to the secondary winding, where a and b are connected to the secondary winding and c and d are connected to the tertiary winding. The magnetic field is not applied to the high-temperature superconducting specimen because no current is applied to the coil before the accident, but the external magnetic field is applied to the high-temperature superconducting specimen with the occurrence of the accident.

[도 3]은 고온초전도 시편에 인가되는 자계크기에 따른 상전도 상태의 저항관계를 개념적으로 보여주는 곡선이며 사고시 기존의 저항형 고온초전도 전류제한 기가 갖는 한류임피던스(저항)값을 제어할 수 있음을 보여준다.3 is a curve conceptually showing the resistance relationship of the phase conduction state according to the magnetic field size applied to the high temperature superconducting specimen, and it is possible to control the current impedance (resistance) of the existing resistance type high temperature superconducting current limiter in case of an accident. Shows.

[도 4]는 상기 [도 3]에 나타낸 사고동안 고온초전도 소자의 자계인가 코일에 흐르는 전류크기에 따라 발생되는 상전도 저항크기에 따라 제한되는 선로전류파형을 지배방정식을 이용하여 수치해석을 통해 시뮬레이션한 결과를 비교한 것으로, 자계인가 코일에 흐르는 전류의 크기에 비례하여 상전도 저항이 5, 10, 20[Ohm]으로 증가됨에 따라 선로전류의 크기가 더욱 크게 감소되는 것을 확인할 수 있다.4 is a numerical diagram using a governing equation for the line current waveform limited by the phase conduction resistance magnitude generated according to the magnitude of the current flowing through the magnetic field or coil of the high temperature superconducting element during the accident shown in FIG. Comparing the simulation results, it can be seen that the magnitude of the line current is further reduced as the phase conduction resistance increases to 5, 10, 20 [Ohm] in proportion to the magnitude of the current flowing through the magnetic field applying coil.

[도 5]는 제안한 전력용 스위치를 포함한 3차측 권선에 연결된 자계인가 회로의 효율향상을 위해 소프트스위칭(Soft Switching)동작을 위해 3차측 권선을 구성하고 있는 회로에 기존의 보조회로를 추가한 예로서, [도 5a]는 영전류 스위칭(ZCS, Zero Current Switching)을 위해, [도 5b]는 영전압 스위칭(ZVS, Zero Voltage Switching)동작을 위해 보조스위치(Sa)를 포함한 공진용 인덕터(Lr)와 공진용 커패시터(Cr), 부가적인 다이오드(Dr)로 구성된 보조회로를 추가한 회로의 예이다.FIG. 5 is an example in which an existing auxiliary circuit is added to a circuit constituting the tertiary winding for soft switching operation to improve the efficiency of the magnetic field applying circuit connected to the tertiary winding including the proposed power switch. 5A illustrates a zero current switching (ZCS), and FIG. 5B illustrates a resonance inductor including an auxiliary switch (S a ) for a zero voltage switching (ZVS) operation. L r ), a resonant capacitor (C r ) and an additional diode (D r ) is an example of a circuit that adds.

본 발명에 의하면 고온초전도 벌크나 박막소자단독으로 동작되는 저항형 고온초전도 전류제한기의 차단용량을 증가시킬 수 있는 방안으로 동일코어에 3차측 권선을 설치하여 사고와 동시에 고온초전도 소자에 자계를 인가시킬 수 있는 구조(도 1, 2 참조)를 갖으며 인가자계의 크기를 조절하기 위해 전력용 반도체스위치소자로 구성된 자계 인가회로를 제안한다. 상술한 바와 같이, 사고시 고온초전도소자의 임계특성에 따라 인가되는 자계크기를 조절하기 위해 동일코어에 설치된 3차측 권선의 탭을 설치할 필요 없이 전력용 반도체소자로 구성된 자계 인가회로의 듀티비를 제어함으로서 인가자계의 크기를 조절할 수 있다. 이때 고주파 스위칭 동작과 전력용 스위칭소자의 소프트스위칭 동작을 위해 공진회로와 보조스위치로 구성된 보조회로를 도입함으로서 자계 인가회로를 구성하는 자계 인가코일의 크기 감소와 함께 효율향상을 기대할 수 있다. 본 발명이 갖는 큰 장점은 듀티비를 제어함으로서 사고시 고온초전도 소자에 인가되는 자계크기를 제어함과 동시에 사고시 상전도 저항크기 조절이 가능하게 됨으로서 사고전류크기를 조절할 수 있는 특징을 가진 고온초전도 전류제한기로, 사고와 동시에 별도의 전원없이 고온초전도 시편에 외부자계를 인가할 수 있을 뿐 아니라 기존에 개발된 저항형 고온초전도 전류제한기의 차단용량을 증가시킬 수 있는 장점이 있다.According to the present invention, by installing a tertiary side winding on the same core as a way to increase the breaking capacity of a high-temperature superconducting bulk or a resistive high-temperature superconducting current limiter operated by a thin film element alone, a magnetic field is applied to the high-temperature superconducting device at the same time. A magnetic field applying circuit having a structure that can be made (see FIGS. 1 and 2) and composed of a power semiconductor switch element for controlling the size of an applied magnetic field is proposed. As described above, by controlling the duty ratio of the magnetic field application circuit composed of the power semiconductor element without the need to install the tap of the tertiary winding in the same core to adjust the magnetic field size applied according to the critical characteristics of the high-temperature superconducting device in the event of an accident The magnitude of the magnetic field can be adjusted. In this case, by introducing an auxiliary circuit composed of a resonance circuit and an auxiliary switch for the high frequency switching operation and the soft switching operation of the power switching element, the size of the magnetic field applying coil constituting the magnetic field applying circuit can be reduced and the efficiency can be expected to be improved. A great advantage of the present invention is to control the magnetic field size applied to the high temperature superconducting element in case of an accident by controlling the duty ratio, and at the same time, to control the magnitude of the phase conduction resistance in the case of an accident, the high temperature superconducting current limit having the feature of controlling the magnitude of the fault current. At the same time, an external magnetic field can be applied to the high-temperature superconducting specimens without a separate power supply at the same time as an accident, and there is an advantage of increasing the breaking capacity of the conventional resistance-type high-temperature superconducting current limiter.

Claims (7)

철심코어에 결선된 1차측 권선과 동일코어에 연결되는 2차측 권선;A secondary winding connected to the same core as the primary winding connected to the core core; 상기 2차측 권선과 직렬로 연결되는 고온초전도 벌크 또는 박막소자;A high temperature superconducting bulk or thin film element connected in series with the secondary winding; 상기 1차측 및 2차측 권선이 권선된 동일코어에 설치된 별도의 3차측 권선 및 3차측 권선에 유기된 전압을 정류하기 위한 다이오드로 구성된 전파정류회로;A full-wave rectifier circuit composed of a separate tertiary side winding and a diode for rectifying the voltage induced in the tertiary side winding installed in the same core wound with the primary and secondary windings; 상기 2차측 권선에 연결된 상기 고온초전도 소자와 상기 고온초전도 소자를 내부에 통과되도록 공심형으로 결선되며 상기 3차측 권선에 연결된 상기 전파정류회로와 직렬로 연결되는 자계인가 코일(도 1, 2 참조);A magnetic field applying coil connected in a concentric manner so that the high temperature superconducting element and the high temperature superconducting element connected to the secondary winding are passed therein and connected in series with the full wave rectifying circuit connected to the tertiary winding (see FIGS. 1 and 2). ; 상기 자계인가 코일과 직렬로 연결되는 다이오드와 저항;A diode and a resistor connected in series with the magnetic field applying coil; 상기 자계인가 코일과 다이오드사이에서 분기되어 상기 정류회로와 병렬로 연결되는 역병렬 다이오드를 내부에 포함하는 전력용 스위칭소자로 구성된, 사고와 동시에 부가적인 전원없이 외부자계를 고온초전도 소자에 인가할 수 있는 전력용 스위치를 이용한 인가 계의 크기조절 기능을 갖는 고온초전도 전류제한 장치.An external magnetic field may be applied to the high temperature superconducting element without additional power at the same time as an accident, comprising a power switching element internally having a reverse parallel diode branched between the magnetic field applying coil and the diode and connected in parallel with the rectifier circuit. High temperature superconducting current limiting device having a function of adjusting the size of an applied system using a power switch. 제 1 항에 있어서, 상기 1차측 권선과 2차측 권선은 교류전류가 분배되어 도통되도록 하기 위하여 병렬로 가극성 또는 감극성으로 동일코어에 연결되며 사고와 동시에, 상기 3차측 권선에 전압이 유기되어 상기의 전파정류회로를 통해 자계인가 코일에 도통되는 전류로 인해 고온초전도 소자에 자계를 인가하게 되는 사고시의 동작을 위한 별도의 전원이 필요치 않은 인가자계의 크기조절 기능을 갖는 고온초전도 전류제한 장치.The method of claim 1, wherein the primary winding and the secondary winding is connected to the same core in the axial or polarity in parallel in order to allow the AC current is distributed and conducting, and at the same time the voltage is induced in the third winding A high temperature superconducting current limiting device having a size control function of an applied magnetic field that does not require a separate power source for an accident operation in which a magnetic field is applied to a high temperature superconducting element due to a current conducted to the magnetic field applying coil through the full-wave rectification circuit. 사고전에는 상기 고온초전도 소자의 저항은 영이 되므로 병렬로 연결된 상기 1차측 권선과 상기 2차측 권선에 인가되는 전압은 같게 되며, 상기 3차측 권선에 유기되는 전압 역시 영이 되어 상기 고온초전도 소자에는 자계가 인가되지 않게 되지만, 사고발생과 동시에 상기 고온초전도 소자는 상전도 상태로 전이되어 저항이 발생되어 상기 1차측 권선과 상기 2차측 권선의 양단전압은 같지 않게 되고 이로 인해 상기 3차 권선에 사고동안 전압이 유기됨으로서 상기 인가자계 코일에 도통되는 전류로 인해 상기 고온초전도 소자에 외부자계가 인가되며, 이때 상기 3차측 권선에 연결된 상기 전력용 스위치(Sm)의 듀티(Duty)비를 조절함으로서 인가되는 자계의 크기를 조절할 수 있고 인가된 자계로 인해 상기 고온초전도 소자의 저항은 외부자계 인가가 이루어지지 않은 단독으로 동작할 경우보다 더욱 증가하게 됨으로서 사고발생시 사고전류의 크기를 보다 크게 제한할 수 있는, 즉 한류율이 향상되는 특징을 갖는 인가자계의 크기조절 기능을 갖는 고온초전도 전류제한 장치.Before the accident, since the resistance of the high temperature superconducting element becomes zero, the voltages applied to the primary side windings and the secondary side windings connected in parallel become the same, and the voltage induced on the tertiary side windings also becomes zero, and a magnetic field is applied to the high temperature superconducting elements. At the same time as the occurrence of an accident, the high temperature superconducting element transitions to a phase conduction state and resistance is generated so that voltages of both ends of the primary winding and the secondary winding are not equal to each other. By being induced, an external magnetic field is applied to the high temperature superconducting element due to the current conducted to the applied magnetic field coil, and at this time, the magnetic field applied by adjusting the duty ratio of the power switch Sm connected to the tertiary winding The resistance of the high temperature superconducting element is controlled by an applied magnetic field, and an external magnetic field is applied. A high temperature superconducting current limiting device having a function of controlling the size of an applied magnetic field having a feature of improving the current-limiting rate at the time of occurrence of an accident by increasing more than when operating alone without support. 제 3 항에 있어서, 상기 3차측 권선에 연결된 상기 전력용 스위치를 포함한 자계 인가 회로의 효율향상을 위해, 보조 다이오드와 보조스위치를 포함한 공진용 인덕터, 공진용 커패시터로 구성되는 보조회로를 추가함으로서 소프트 스위칭(Soft Switching)동작을 수행할 수 있는, 전력용 스위치를 이용한 인가 자계의 크기조절기능을 갖는 고온초전도 전류제한 장치.4. The method of claim 3, wherein the auxiliary circuit comprising a resonant inductor including an auxiliary diode and an auxiliary switch and a resonant capacitor is added to improve the efficiency of the magnetic field applying circuit including the power switch connected to the tertiary winding. A high temperature superconducting current limiting device having a scaling function of an applied magnetic field using a power switch, which can perform a soft switching operation. 제 3 항에 있어서, 상기 3차측 권선에 연결된 상기 자계인가코일을 포함하여 비절연형 컨버터인 벅(Buck)타입, 부스트(Boost)타입 그리고 벅부스트(Buck-Boost)타입과 절연형 컨버터인 푸시풀(Push-Pull)타입, 플라이백(Flyback)타입, 포워드(Forward)타입, 하프브리지(Half Bridge)타입 그리고 풀브리지(Full Bridge)타입의 컨버터 회로에 결합되어 듀티비를 제어할 수 있는 구조를 갖으며, 이때 각각의 컨버터회로의 효율향상을 위해 하나 또는 두 개의 보조스위치를 추가하여 소프트 스위칭을 구현할 수 있는 하나 또는 두 개 이상의 전력용 스위치로 구성되는 전력용 스위치를 이용한 인가 자계의 크기조절 기능을 갖는 고온초전도 전류제한 장치.The push-pull as claimed in claim 3, wherein the non-isolated converter is a buck type, a boost type and a buck-boost type and an isolated converter including the magnetic field applying coil connected to the tertiary winding. The structure that can control the duty ratio by being combined with (Push-Pull), Flyback type, Forward type, Half bridge type and Full bridge type converter circuit In this case, the size adjustment of the applied magnetic field using the power switch composed of one or more power switches that can implement soft switching by adding one or two auxiliary switches to improve the efficiency of each converter circuit High temperature superconducting current limiting device having a. 제 3 항에 있어서, 상기 전력용 스위치의 고주파스위칭을 통해 듀티비를 제어함으로서 자계인가코일의 부피를 감소시킬 수 있을 뿐 아니라 사고와 동시에 3차측 권선에 흐르게 되는 전류의 크기를 조절함으로서, 고온초전도 소자에 인가되는 자계의 크기를 가변할 수 있어, 사고전류 크기를 제어할 수 있는 특징을 갖는 전력용 스위치를 이용한 인가 자계의 크기조절 기능을 갖는 고온초전도 전류제한 장치.According to claim 3, By controlling the duty ratio through the high-frequency switching of the power switch can not only reduce the volume of the magnetic field applied coil, but also by controlling the magnitude of the current flowing in the tertiary winding at the same time, high temperature superconductivity A high temperature superconducting current limiting device having a function of controlling the magnitude of an applied magnetic field using a power switch having a characteristic of controlling a magnitude of an accidental current by varying the magnitude of a magnetic field applied to the device. 제 3 항에 있어서, 기존의 벌크형태로 제작한 라드(Rod) 타입뿐 아니라 박막형태로 제작된 저항형 고온초전도 전류제한기에 적용함으로서, 기존의 벌크형태 또는 박막형태로 제작된 저항형 고온초전도 소자 단독으로 동작시보다 사고전류 크기를 보다 크게 제한할 수 있는 특징을 갖는, 저항형 고온초전도 전류제한기의 차단용량을 증가시킬 수 있으며, 사고전류 크기를 제어할 수 있을 뿐 아니라 차단용량이 증가되는 특징을 갖는 사고전류제어형 고온초전도 전류제한기로 동작할 수 있는 확장성을 포함한 전력용 스위치를 이용한 인가 자계의 크기조절 기능을 갖는 고온초전도 전류제한 장치.4. The resistive high-temperature superconducting device of claim 3, which is applied to a resistive high-temperature superconducting current limiter manufactured in a thin film form as well as a rod type manufactured in a conventional bulk form. It can increase the breaking capacity of the resistance type high temperature superconducting current limiter, which can limit the magnitude of the fault current more than the operation alone. A high temperature superconducting current limiting device having a function of adjusting the magnitude of an applied magnetic field by using a power switch including expandability capable of operating as a fault current control type high temperature superconducting current limiting device having a characteristic.
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KR100776419B1 (en) * 2006-05-04 2007-11-16 조선대학교산학협력단 Magnetic flux-limited superconducting current limiter for improving quench characteristics
KR100959661B1 (en) * 2008-04-14 2010-05-26 숭실대학교산학협력단 Superconducting current limiter using power system protection device and magnetic coupling for protection coordination
KR101037713B1 (en) * 2010-03-03 2011-05-27 숭실대학교산학협력단 Superconducting Current Limiter for Fault Current Limiting and Uninterruptible Power Supply

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JP3699487B2 (en) * 1993-04-07 2005-09-28 新日本製鐵株式会社 Superconducting / normal conducting transition type fault current limiter
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Publication number Priority date Publication date Assignee Title
KR100776419B1 (en) * 2006-05-04 2007-11-16 조선대학교산학협력단 Magnetic flux-limited superconducting current limiter for improving quench characteristics
KR100959661B1 (en) * 2008-04-14 2010-05-26 숭실대학교산학협력단 Superconducting current limiter using power system protection device and magnetic coupling for protection coordination
KR101037713B1 (en) * 2010-03-03 2011-05-27 숭실대학교산학협력단 Superconducting Current Limiter for Fault Current Limiting and Uninterruptible Power Supply
WO2011108793A1 (en) * 2010-03-03 2011-09-09 숭실대학교산학협력단 Superconducting current limiter for suppressing bus voltage drop of electric power system
US20120327538A1 (en) * 2010-03-03 2012-12-27 Foundation Of Soongsil University-Industry Cooperation Superconducting fault current limiter for suppressing bus voltage drop in electric power system
US8810978B2 (en) * 2010-03-03 2014-08-19 Foundation Of Soongsil University-Industry Cooperation Superconducting fault current limiter for suppressing bus voltage drop in electric power system

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