KR20090120766A - Fault current limiting method through the application of superconducting fault current limiter into the neutral line of power system - Google Patents

Fault current limiting method through the application of superconducting fault current limiter into the neutral line of power system Download PDF

Info

Publication number
KR20090120766A
KR20090120766A KR1020080046727A KR20080046727A KR20090120766A KR 20090120766 A KR20090120766 A KR 20090120766A KR 1020080046727 A KR1020080046727 A KR 1020080046727A KR 20080046727 A KR20080046727 A KR 20080046727A KR 20090120766 A KR20090120766 A KR 20090120766A
Authority
KR
South Korea
Prior art keywords
current limiter
superconducting current
power system
superconducting
fault
Prior art date
Application number
KR1020080046727A
Other languages
Korean (ko)
Other versions
KR100981257B1 (en
Inventor
김재철
임성훈
문종필
김진석
안재민
Original Assignee
숭실대학교산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 숭실대학교산학협력단 filed Critical 숭실대학교산학협력단
Priority to KR1020080046727A priority Critical patent/KR100981257B1/en
Publication of KR20090120766A publication Critical patent/KR20090120766A/en
Application granted granted Critical
Publication of KR100981257B1 publication Critical patent/KR100981257B1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/023—Current limitation using superconducting elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Abstract

PURPOSE: A fault current limiting method using a superconductive current limiter in a neutral line of a power system is provided to perform a current limiting operation about an asymmetrical ground fault by installing a superconductive current limiter to a neutral line of a power system. CONSTITUTION: An asymmetrical fault current is limited from an asymmetrical ground fault like one line ground fault or two lines ground fault by applying a superconductive current limiter to a neutral line of a power system having Y-wired neutral line ground. An indirect current limiting operation of the superconductive current limiter is performed from the fault current having an asymmetrical ground component by connecting the neutral line and the superconductive current limiter in a first side and a second side of an insulation transformer.

Description

전력계통의 중성선에 초전도 전류제한기의 적용을 통한 고장전류 제한 방법 {Fault current limiting method through the application of superconducting fault current limiter into the neutral line of power system}Fault current limiting method through the application of superconducting fault current limiter into the neutral line of power system}

본 발명은 전력계통의 고장전류크기를 감소시켜 차단기의 부담을 줄이기 위한 초전도 전류제한기의 계통적용 위치로써 전력계통의 중성선에 초전도 전류제한기를 적용하는 방안에 관한 것으로, 계통에서 빈번히 발생하는 일선지락, 이선지락과 같은 비대칭 지락고장으로 인한 고장전류를 제한할 수 있는 있으며, 초전도 전류제한기를 구성하는 초전도 소자의 개수와 용량을 감소시킬 수 있을 뿐 아니라, 고장제거 후에는 초전도 전류제한기에 전류가 흐르지 않기 때문에 초전도 상태로의 회복시간도 현저히 단축시킬 수 있어 기존의 차단기와 같은 보호장치의 재투입시간에도 제한받지 않고 연계동작이 가능한 초전도 전류제한기의 계통 적용위치에 관한 것이다.The present invention relates to a method of applying a superconducting current limiter to a neutral line of a power system as a system application position of a superconducting current limiter for reducing the burden of a circuit breaker by reducing the fault current size of the power system. In addition, the fault current can be limited due to asymmetric ground faults such as two-wire ground fault, and the number and capacity of the superconducting elements constituting the superconducting current limiter can be reduced, and the current does not flow to the superconducting current limiter after the fault is removed. Since the recovery time to the superconducting state can be shortened significantly, the system application position of the superconducting current limiter which can be linked without limiting the re-input time of the protection device such as a conventional circuit breaker is possible.

초전도 전류제한기를 전력계통의 선로에 직접 적용하여 고장전류를 제한하는 기존의 방안은 고장과 함께 초전도체의 고유특성인 quench를 통해 신속한 전류제한 이 가능하나 기존의 차단기와 같은 보호장치의 트립시간을 지연시켜 초전도 전류제한기를 긴 시간 동안 고장전류에 노출시킴에 따라 초전도 전류 제한기를 구성하는 초전도 소자들의 파손을 야기시 킬 우려가 있다. 또한, 고장 제거 후에도 선로전류가 직접적으로 초전도 전류 제한기에 도통하므로 초전도 상태로 회복되기까지 비교적 긴 회복시간이 걸리게 되어 기존의 차단기와 같은 보호장치와 연계동작시 이들 보호장치들이 재투입되었을 때 계통에 영향을 주게 된다. 이와 같이 계통의 선로에 직접 초전도 전류 제한기를 적용했을 때 야기되었던 문제점들을 계통의 중성선에 적용함으로써 해결할 수 있는 방안을 제안하고 한다.The conventional method of limiting the fault current by directly applying the superconducting current limiter to the line of the power system is possible to quickly limit the current through the quench, which is inherent to the superconductor, with the failure, but delays the trip time of the protection device such as a conventional circuit breaker. By exposing the superconducting current limiter to fault current for a long time, the superconducting elements constituting the superconducting current limiter may be damaged. In addition, since the line current is directly connected to the superconducting current limiter even after the fault is removed, it takes a relatively long recovery time to recover to the superconducting state. Will be affected. In this way, we propose a solution that can solve the problems caused by applying the superconducting current limiter directly to the system line to the neutral line of the system.

본 발명은 초전도 전류제한기를 전력계통의 중성선에 설치함으로써 삼상지락고장과 같은 대칭지락고장에 비해 보다 많은 발생회수를 갖는 비대칭 지락고장에 대해 전류제한 동작이 가능하기 때문에 초전도 전류제한기 활용측면에서 보다 유리하며, 기존의 각 상에 설치하는 방안보다 초전도 소자의 개수와 용량을 감소시킬 수 있으며, 고장제거후에는 초전도 전류제한기에 전류가 도통되지 않게 되므로, 고장제거시 회복시간 또한 크게 단축되는 장점을 가지게 된다. 이에 따라, 고장발생시 기존의 보호장치인 차단기의 반복적인 트립과 재투입동작에 대해 연계동작이 가능한 특징을 가지고 있다. According to the present invention, the superconducting current limiter is installed on the neutral line of the power system, so the current limiting operation is possible for the asymmetric ground fault having more occurrences than the symmetrical ground fault such as the three phase ground fault. Advantageously, the number and capacity of superconducting elements can be reduced compared to the existing methods of installing each phase, and since the current is not conducted to the superconducting current limiter after the fault is removed, the recovery time is also greatly reduced. To have. Accordingly, in the event of a failure, it has a feature that can be linked to the repetitive trip and re-entry operation of the circuit breaker of the existing protection device.

본 발명은 Y 결선된 중성선 접지를 갖는 전력계통에 초전도 전류제한기의 적용위치로 선로대신에 중성선에 설치하여 비대칭성분을 갖는 지락전류로부터 전력계통을 보호하는 방안에 관한 것이다. 이때, 초전도 전류제한기는 지금까지 개발된 여러 종류의 초전도 전류제한기(저항형, 유도형, 정류형 등)중 하나로 대체가 가능하며, 비교적 발생회수가 빈번한 일선 지락고장과 이선 지락고장에서는 비대칭성분의 전류가 중성선에 흐르게 되어 중성선에 설치된 초전도 전류제한기가 동작하여 고장전류를 제한할 수 있다. 또한, 중성선에 설치한 초전도 전류제한기를 구성하는 초전도 소자의 quench 발생시점을 용이하게 조절하기 위한 방안으로 절연변압기의 1차측을 중성선에 직렬로 연결하고 2차측에 초전도 전류제한기를 연결하는 구조와 중성선을 갖지 않는 계통의 경우, 비대칭 성분을 갖는 고장전류를 제한하기 위한 방안으로 삼상의 각 상에 직렬변압기의 1차측을 각각 연결하고 각각의 직렬변압기 2차측은 초전도 전류제한기와 함께 서로 직렬로 연결한 구조로도 확장하여 적용할 수 있는 것을 특징으로 한다.The present invention relates to a method for protecting a power system from a ground fault current having an asymmetrical component by installing a neutral conductor instead of a line to a superconducting current limiter in a power system having a Y-wired neutral ground. At this time, the superconducting current limiter can be replaced by one of several types of superconducting current limiters (resistance type, inductive type, rectifying type, etc.) developed so far, and asymmetrical component in single ground fault and double ground fault Since the current flows through the neutral line, the superconducting current limiter installed in the neutral line operates to limit the fault current. Also, in order to easily control the time of quench generation of the superconducting element which constitutes the superconducting current limiter installed in the neutral line, the structure of connecting the primary side of the isolation transformer to the neutral line in series and the superconducting current limiter to the secondary side and the neutral line In the case of a system with no system, the primary side of the series transformer is connected to each phase of each of the three phases, and the secondary side of each series transformer is connected to each other in series with the superconducting current limiter. It is characterized in that it can be applied to extend the structure.

그 밖에, 삼선 지락고장과 같은 삼상 대칭고장에 대해서도 고장전류를 제한할 수 있는 방안이 필요할 경우, 중성선에 초전도 전류제한기를 설치함과 동시에 삼상 중 하나의 상에 초전도 전류제한기를 추가로 설치함으로써 비대칭 지락고장뿐 아니라 삼상 지락고장과 같은 삼상 대칭고장으로부터도 계통을 보호할 수 있다.In addition, if there is a need to limit the fault current for three-phase symmetrical faults such as three-wire ground faults, the superconducting current limiter is installed in the neutral line and the superconducting current limiter is installed in one of the three phases. The system can be protected not only from ground fault but also from three-phase symmetric fault such as three-phase ground fault.

본 발명에 의하면 전력계통의 중성선에 초전도 전류제한기를 적용하면 보다 빈번히 발생하는 비대칭 지락고장에 대해 기존의 선로에 초전도 전류제한기를 직접 적용하던 방안보다 초전도 전류제한기의 개수와 용량측면에서 부담을 줄임과 동시에 전류제한 동작이 가능한 방안으로, 고장제거와 동시에 초전도 전류제한기의 초전도 상태로의 회복도 즉시 이루어져 기존의 차단기와 같은 보호장치의 재투입시간에도 제한받지 않고 연계동작이 가능한 장점을 갖는다.According to the present invention, applying the superconducting current limiter to the neutral line of the power system reduces the burden in terms of the number and capacity of the superconducting current limiter compared to the method of directly applying the superconducting current limiter to the existing line for the asymmetrical fault which occurs more frequently. At the same time, the current limiting operation is possible, and the fault recovery and the recovery of the superconducting current limiter to the superconducting state are immediately performed, and thus, the linking operation can be performed without being limited by the re-entry time of the protection device such as a conventional circuit breaker.

본 발명에 의한 전력계통의 중성선에 하나의 초전도 전류제한기를 적용한 보호방식의 구성은 Y결선된 중성선접지를 갖는 전력계통의 각 상에 계통전원과 부하가 연결되고, 중성선에 초전도 전류제한기가 연결된 구조를 갖는다.The configuration of the protection scheme in which one superconducting current limiter is applied to the neutral line of the power system according to the present invention has a structure in which a grid power supply and a load are connected to each phase of the power system having a Y-wired neutral line ground, and a superconducting current limiter is connected to the neutral line. Has

본 발명에 의한 전력계통의 중성선에 초전도 전류제한기를 적용한 보호방식의 동작 을 설명하면 다음과 같다.Referring to the operation of the protection method applying the superconducting current limiter to the neutral line of the power system according to the present invention.

전력계통의 중성선에 설치된 초전도 전류제한기는 평상시에는 저항이 영이 되며, 따라서 초전도 전류제한기 양단의 전압도 영이 된다. 이때, 삼상중 하나 또는 두 개의 상에서 지락고장이 발생하게 되면 선로에는 비교적 큰 전류가 흐르게 되고, 이로 인해 중성선에는 비대칭 성분의 고장전류가 흐르게 된다. 이때, 중성선에 흐르는 비대칭 성분의 고장전류가 초전도 전류제한기를 구성하는 초전도 소자의 임계전류값을 넘게 되면 초전도 소자의 quench로 인해 저항이 발생하게 되고 이 저항에 의해 단락된 상에 흐르는 고장전류가 제한된다. 또한, 초전도 전류제한기를 계통의 중성선에 적용할 경우 고장이 제거되면 중성선에는 전류가 흐르지 않게 되므로 초전도 전류제한기는 고장제거와 동시에 초전도 상태로 신속히 회복되는 동작을 보여준다. 반면에, 계통의 선로에 초전도 전류제한기를 적용하는 기존의 방안의 경우에는 고장이 제거되어도 초전도 전류제한기에 선로전류가 직접 도통하기 때문에 초전도 상태로 회복되기까지 상당히 긴 시간이 걸리게 되어 고장제거직후에도 고장상의 부하전압이 평상시보다 강하되어 나타나는 현상이 발생하게 된다. The superconducting current limiter installed on the neutral line of the power system usually has zero resistance, so the voltage across the superconducting current limiter is also zero. At this time, if a ground fault occurs in one or two phases of the three phases, a relatively large current flows through the line, and thus a fault current of an asymmetric component flows through the neutral line. At this time, if the fault current of the asymmetric component flowing in the neutral line exceeds the threshold current value of the superconducting element constituting the superconducting current limiter, resistance is generated due to the quench of the superconducting element, and the fault current flowing in the shorted phase is limited by this resistance. do. In addition, when the superconducting current limiter is applied to the neutral line of the system, the current is not flowed to the neutral line when the fault is removed, so the superconducting current limiter shows the operation of quickly recovering to the superconducting state at the same time as the fault is removed. On the other hand, in the conventional scheme of applying the superconducting current limiter to the line of the system, since the line current is directly connected to the superconducting current limiter even when the fault is removed, it takes a long time to recover to the superconducting state. It occurs that the faulty load voltage is lower than usual.

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 초전도 전류제한기를 삼상 각 상에 직접 적용한 기존의 고장전류 제한 방안으로, 각 상의 지락고장 전류를 제한하기 위해서는 기본적으로 세대의 초전도 전류제한기가 필요하다. 삼상중 임의의 상에서 지락고장이 발생하면, 고장전류가 지락고장이 발생한 상에 설치된 초전도 전류제한기를 구성하는 초전도 소자의 임계전류값을 넘게 되어 지락고장이 발생한 상에 있는 초전도 전류제한기가 동작하 게 되며, 고장이 제거된 후에도 초전도 전류제한기가 초전도 상태로 회복되기까지 긴 회복시간이 요구된다. 이로 인해, 고장이 제거되더라도 초전도 전류제한기가 완전히 초전도 상태로 회복되기전까지 고장상의 부하전압이 평상시 전압보다 강하되어 나타나게 된다.1 is a conventional fault current limiting method in which a superconducting current limiter is directly applied to each phase of a three phase, and in order to limit the ground fault current of each phase, a superconducting current limiter of the generation is basically required. If a ground fault occurs in any of the three phases, the fault current exceeds the threshold current value of the superconducting element that constitutes the superconducting current limiter installed on the ground fault occurrence, so that the superconducting current limiter in the ground fault state is operated. After the fault is removed, a long recovery time is required until the superconducting current limiter recovers to the superconducting state. As a result, even when the fault is eliminated, the faulty load voltage is lower than the normal voltage until the superconducting current limiter completely recovers to the superconducting state.

[도 2]는 초전도 전류제한기를 계통의 각 상에 설치한 경우로, a상에서 일선지락이 발생한 경우, 고장상에 흐르는 전류와 고장상의 부하전압파형을 보여준다. a상에서 고장발생과 동시에 a상 전류가 크게 상승하지만 a상에 설치된 초전도 전류제한기의 저항발생으로 a상 전류가 신속히 제한되는 것을 볼 수 있다. 또한, 고장이 제거된 후에는 초전도 전류제한기가 초전도 상태로 회복되면서 평상시 전압보다 강하되어 나타났던 고장상의 부하전압이 평상시 전압의 크기로 점차 회복되는 것을 확인할 수 있다.2 is a case where the superconducting current limiter is installed on each phase of the system, and when a first ground fault occurs in phase a, the current flowing in the fault phase and the load voltage waveform in the fault phase are shown. It can be seen that the phase a current is greatly increased at the same time as the failure in phase a, but the phase a current is quickly limited by the resistance of the superconducting current limiter installed in phase a. In addition, after the fault is removed, as the superconducting current limiter recovers to the superconducting state, it can be confirmed that the faulty load voltage, which appears to be lowered than the normal voltage, gradually recovers to the magnitude of the usual voltage.

[도 3]과 [도 4]는 초전도 전류제한기를 계통의 각 선로에 설치한 경우, a 상과 c상에서 이선지락 고장이 발생한 경우와 a, b, c 세 개의 모든 상에서 삼선지락 고장이 발생한 경우에 대한 상전류와 부하전압파형을 각각 보여준다. [도 2]의 a상에서 일선지락고장이 발생한 경우에서처럼 고장이 발생한 상의 전류가 크게 상승되지만 각 상에 설치된 초전도 전류제한기에 의해 즉시 제한되는 것을 볼 수 있으며, 고장이 제거된 경우 고장상에 해당되는 부하전압이 평상시 전압크기로 회복되기까지 시간이 걸리는 것을 확인할 수 있다.[Fig. 3] and [Fig. 4] are the case where the two-phase ground fault occurs in phase a and c, and the three-wire ground fault occurs in all three phases a, b, and c when the superconducting current limiter is installed in each line of the system. Shows the phase current and load voltage waveforms, respectively. As shown in the case of the first ground fault in phase a of FIG. 2, the current of the faulty phase is greatly increased, but it can be seen that it is immediately limited by the superconducting current limiter installed in each phase. It can be seen that it takes time for the load voltage to recover to the usual voltage level.

[도 5]는 본 발명에서 제안한 중성선에 초전도 전류제한기를 직접 적용하여 비대칭 성분을 갖는 고장전류를 제한하기 위한 방안이다. a, b, c상 중에서 하나 또는 두개의 상에서 지락고장이 발생하면 중성선에 비대칭성분의 전류가 흐르게 되고, 이 전류가 초전도 소자의 임계전류값을 초과하면 저항이 발생되며, 비대칭 성분의 고장전류가 제한됨에 따라 고장상의 고장전류가 제한되는 방식이다. 이때, 고장이 제거된 후에는 초전도 전류제한기에는 전류가 흐르지 않기 때문에 초전도 상태로의 회복이 빠르게 진행되어 고장제거와 동시에 고장상의 부하전압이 평상시 전압크기로 즉시 회복되는 장점을 가지고 있다. FIG. 5 is a method for limiting a fault current having an asymmetrical component by directly applying a superconducting current limiter to the neutral line proposed by the present invention. If a ground fault occurs in one or two of a, b, and c phases, an asymmetric component current flows in the neutral wire, and if this current exceeds the threshold current value of the superconducting element, resistance is generated, and a fault current of the asymmetric component As it is limited, the fault current in the fault is limited. At this time, since the current does not flow in the superconducting current limiter after the fault is removed, the recovery to the superconducting state proceeds quickly, and the load voltage on the fault is immediately recovered to the usual voltage size at the same time as the fault is removed.

[도 6]과 [도 7]은 중성선에 초전도 전류제한기를 직접 적용한 경우 a상과 a, c상에서 각각, 일선 지락 및 이선 지락 고장발생시 선로전류와 부하전압파형을 보여준다. 고장이 발생하면 비대칭 성분의 전류가 중성선에 도통하게 되며 이로 인해 중성선에 설치된 초전도 전류제한기의 저항발생으로 고장선로의 전류가 제한되는 것을 확인할 수 있다. 또한, 고장이 제거되면, 초전도 전류제한기를 선로에 직접 적용했던 기존의 방안([도 1])과는 달리 고장상의 부하전압이 고장제거와 동시에 평상시 전압크기로 신속히 회복되는 것을 볼 수 있다.6 and 7 show the line current and load voltage waveforms in the case of a one-ground and two-wire ground faults in phases a, a, and c, respectively, when the superconducting current limiter is directly applied to the neutral line. If a fault occurs, the current of the asymmetrical component conducts to the neutral line, which causes the current of the fault line to be limited due to the resistance of the superconducting current limiter installed in the neutral line. In addition, when the fault is eliminated, unlike the conventional method ([FIG. 1]) in which the superconducting current limiter is directly applied to the line, the load voltage on the fault may be quickly recovered to the usual voltage size at the same time as the fault is eliminated.

[도 8]은 전력계통의 중성선에 절연변압기와 초전도 전류제한기를 적용하여 비대칭성분을 갖는 지락고장전류를 간접적으로 제한하기 위한 방안의 예를 보여주며, 절연변압기의 1차와 2차 권선의 권선비를 조절함으로써 비대칭 지락고장발생시 제한기 동작전류와 중성선에 투입되는 초전도 전류제한기의 저항크기를 조절할 수 있다.[Figure 8] shows an example of a method for indirectly limiting the ground fault current having an asymmetrical component by applying an insulation transformer and a superconducting current limiter to the neutral line of the power system, the winding ratio of the primary and secondary windings of the insulation transformer By adjusting, it is possible to adjust the limiter operating current and resistance size of superconducting current limiter input to the neutral line when asymmetric ground fault occurs.

[도 9]는 전력계통의 중성선에 초전도 전류제한기를 적용하여 비대칭성분을 갖는 지락고장전류 뿐 아니라 대칭성분을 갖는 고장전류에 대해서도 전류제한 동작 을 위한 방안의 예를 보여주며, 중성선에 초전도 전류제한기를 설치함과 동시에 삼상 중 하나의 상에 초전도 전류제한기를 추가로 설치함으로써 비대칭 지락고장뿐 아니라 삼상 지락고장과 같은 삼상 대칭고장으로부터도 계통을 보호할 수 있다.FIG. 9 shows an example of a method for current limiting operation for fault currents having symmetrical components as well as ground fault currents having an asymmetrical component by applying a superconducting current limiter to the neutral line of the power system, and superconducting current limiting to the neutral line. In addition to installing the device, by installing an additional superconducting current limiter on one of the three phases, the system can be protected from not only asymmetric ground fault but also three phase symmetric fault such as three phase ground fault.

[도 10]은 중성선을 갖지 않는 비접지 전력계통에서 비대칭성분을 갖는 고장발생시 초전도 전류제한기를 적용하여 고장전류를 제한하기 위한 방안의 예를 보여준다. 삼상의 각 상에 직렬변압기의 1차측을 연결하고 각각의 직렬변압기 2차측은 서로 직렬로 연결하되 초전도 전류제한기와 함께 연결되는 구성을 가지고 있으며, 직렬변압기의 1차와 2차 권선비를 조절함으로써 비대칭 지락고장 발생시 초전도 전류제한기의 동작전류와 저항크기를 조절할 수 있는 장점을 가지고 있다.FIG. 10 shows an example of a method for limiting a fault current by applying a superconducting current limiter when a fault having an asymmetric component occurs in an ungrounded power system having no neutral wire. The primary side of the series transformer is connected to each phase of three phases, and the secondary side of each series transformer is connected to each other in series, but together with the superconducting current limiter, and is asymmetrical by adjusting the primary and secondary turns ratio of the series transformer. In case of ground fault, it has the advantage of controlling the operating current and resistance of superconducting current limiter.

[도 1]은 전력계통의 각 상에 초전도 전류제한기를 적용한 기존의 고장전류제한 방안.1 is a conventional fault current limiting method applying a superconducting current limiter on each phase of the power system.

[도 2]는 전력계통의 각 상에 초전도 전류제한기를 적용한 경우, 일선 지락 고장시 부하전압과 선로전류 파형.2 is a load voltage and line current waveform when a ground fault occurs when a superconducting current limiter is applied to each phase of a power system.

[도 3]은 전력계통의 각 상에 초전도 전류제한기를 적용한 경우, 이선 지락 고장시 부하전압과 선로전류 파형.3 is a load voltage and line current waveforms when a two-wire ground fault occurs when a superconducting current limiter is applied to each phase of the power system.

[도 4]는 전력계통의 각 상에 초전도 전류제한기를 적용한 경우, 삼선 지락 고장시 부하전압과 선로전류 파형.4 is a load voltage and line current waveforms when a three-wire ground fault occurs when a superconducting current limiter is applied to each phase of a power system.

[도 5]는 본 발명에서 제안한 전력계통의 중성선에 초전도 전류제한기를 적용하여 비대칭성분을 갖는 고장전류를 제한하기 위한 방안(직접 동작하는 방안).5 is a method for limiting the fault current having an asymmetrical component by applying a superconducting current limiter to the neutral line of the power system proposed in the present invention (direct operation method).

[도 6]은 전력계통의 중성선에 초전도 전류제한기를 적용한 경우 일선 지락 고장시 부하전압과 선로전류 파형.6 is a waveform of load voltage and line current when a ground fault occurs when a superconducting current limiter is applied to a neutral line of a power system.

[도 7]은 전력계통의 중성선에 초전도 전류제한기를 적용한 경우 이선 지락 고장시 부하전압과 선로전류 파형.7 is a load voltage and line current waveforms in case of a double ground fault when the superconducting current limiter is applied to the neutral line of the power system.

[도 8]은 전력계통의 중성선에 절연변압기와 초전도 전류제한기를 적용하여 비대칭 성분을 갖는 지락고장전류를 간접적으로 제한하기 위한 방안의 예.8 is an example of a method for indirectly limiting the ground fault current having an asymmetrical component by applying an insulation transformer and a superconducting current limiter to the neutral line of the power system.

[도 9]는 전력계통의 중성선에 초전도 전류제한기를 적용하여 비대칭성분을 갖는 지락고장전류 뿐 아니라 대칭성분을 갖는 지락고장전류에 대해서도 전류제한 동작을 위한 방안의 예.9 is an example of a scheme for current limiting operation for ground fault currents having symmetrical components as well as ground fault currents having asymmetrical components by applying a superconducting current limiter to the neutral line of the power system.

[도 10]은 중성선을 갖지 않는 비접지 전력계통에서 비대칭성분을 갖는 고장발생시 초전도 전류제한기를 적용하여 고장전류를 제한하기 위한 방안의 예.FIG. 10 is an example of a scheme for limiting a fault current by applying a superconducting current limiter when a fault having an asymmetric component occurs in an ungrounded power system having no neutral wire. FIG.

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

Ea, Eb, Ec : 계통전원 전압E a , E b , E c : Grid power supply voltage

Za, Zb, Zc : 선로 임피던스Z a , Z b , Z c : Line impedance

ZL a, ZL b, ZL c : 부하 임피던스Z L a , Z L b , Z L c Load impedance

SFCLa, SFCLa, SFCLa, SFCLn : 초전도 소자SFCL a , SFCL a , SFCL a , SFCL n : Superconducting element

i a, i b, i c : 상 전류 i a , i b , i c : phase current

v a L , v b L , v c L : 부하 전압 v a L , v b L , v c L : load voltage

N1 : 1차 권선 수N 1 : Number of primary turns

N2 : 2차 권선 수N 2 : number of secondary windings

Claims (5)

Y결선된 중성선접지를 갖는 전력계통의 중성선에 초전도 전류제한기를 적용하여 일선지락 또는 이선지락 고장과 같은 비대칭 지락고장으로부터 비대칭 고장전류를 제한할 수 있는 특징을 가진 전력계통의 중성선에 초전도 전류제한기를 적용한 전력계통의 보호방식.The superconducting current limiter is applied to the neutral line of the power system with the characteristic that the superconducting current limiter is applied to the neutral line of the Y-connected neutral line ground to limit the asymmetric fault current from asymmetrical ground fault such as single line or double line fault. Applied power system protection method. 제 1 항에 있어서, 절연변압기를 이용하여 절연변압기의 1차측과 2차측에 중성선과 초전도 전류제한기를 각각 연결하여(도 8 참조) 비대칭 지락성분을 갖는 고장전류로부터 초전도 전류제한기의 간접적인 전류제한 동작이 가능하며, 절연변압기의 1차와 2차 권선비를 조절함으로써 비대칭 지락고장 발생시 중성선에 투입되는 초전도 전류제한기의 저항크기와 제한기의 동작전류 크기를 조절할 수 있는 특징을 가진 중성선에 절연변압기와 초전도 전류제한기를 적용한 전력계통의 보호방식.The indirect current of the superconducting current limiter according to claim 1, wherein a neutral wire and a superconducting current limiter are connected to the primary side and the secondary side of the insulated transformer by using an isolation transformer (see FIG. 8). Limited operation is possible, and by controlling the primary and secondary winding ratio of the insulation transformer, it is insulated from the neutral wire that has the characteristics of controlling the resistance size of the superconducting current limiter and the operating current of the limiter which are put into the neutral line when asymmetric ground fault occurs. Power system protection system using transformer and superconducting current limiter. 제 1 항에 있어서, 전력계통의 중성선에 적용된 초전도 전류제한기 종류 중 하나인 저항형 초전도 전류제한기 이외에도 지금까지 개발된 초전도 전류제한기중 하나와 대체할 수 있는 전력계통의 중성선에 초전도 전류제한기를 적용한 전력계통의 보호방식.The superconducting current limiter in the neutral line of the power system according to claim 1, in addition to one of the superconducting current limiters developed so far, in addition to the resistance type superconducting current limiter which is one of the superconducting current limiters applied to the neutral line of the power system. Applied power system protection method. 제 1 항에 있어서, 전력계통의 중성선에 초전도 전류제한기를 적용하여 삼상 비대칭 지락고장을 포함하여 삼상 대칭지락고장에 대해서도 전류제한 동작을 위한방안으로, 삼상 중 임의의 하나의 상에 초전도 전류제한기를 추가로 설치하여 두 개의 초전도 전류제한기를 삼상 중 하나와 계통의 중성선에 적용함으로써 전력계통의 비대칭 성분을 갖는 지락고장 전류뿐 아니라 대칭성분을 갖는 지락고장에 대해서도 전류제한이 가능한 두 개의 초전도 전류제한기를 적용한 전력계통의 보호방식 (도 9 참조).The method of claim 1, wherein the superconducting current limiter is applied to any one of the three phases in order to apply the current limiting operation to the three-phase symmetrical ground fault, including the three-phase asymmetric ground fault by applying the superconducting current limiter to the neutral line of the power system. In addition, by installing two superconducting current limiters to one of the three phases and the neutral of the system, two superconducting current limiters capable of limiting the current to ground faults with symmetrical components as well as ground fault currents with symmetrical components Applied protection system of the power system (see Fig. 9). △결선된 부하와 같이 중성선이 없는 전력계통에 초전도 전류제한기를 적용하여 삼상 비대칭 지락고장에 대해 전력계통을 보호하기 위한 방안으로, 삼상 각 상에 직렬변압기의 1차측을 연결하고 각각의 직렬변압기 2차측을 하나의 초전도 전류제한기와 함께 직렬로 연결하여(도 10 참조), 직렬변압기의 1차와 2차 권선비를 조절함으로써 중성선이 없는 전력계통에서 비대칭 지락고장발생시 초전도 전류제한기의 동작전류와 저항크기를 조절할 수 있는 특징을 가진 초전도 전류제한기를 적용한 전력계통의 보호방식.△ To protect the power system against three-phase asymmetric ground fault by applying superconducting current limiter to the power system without neutral wire such as the connected load, connect the primary side of the series transformer in each phase of each three-phase transformer 2 The secondary side is connected in series with one superconducting current limiter (see Fig. 10) to adjust the primary and secondary winding ratios of the series transformers so that the operating current and resistance of the superconducting current limiter in case of asymmetrical ground fault in the power system without neutral wire Power system protection system using superconducting current limiter with adjustable size.
KR1020080046727A 2008-05-20 2008-05-20 Fault current limiting method through the application of superconducting fault current limiter into the neutral line of power system KR100981257B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020080046727A KR100981257B1 (en) 2008-05-20 2008-05-20 Fault current limiting method through the application of superconducting fault current limiter into the neutral line of power system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080046727A KR100981257B1 (en) 2008-05-20 2008-05-20 Fault current limiting method through the application of superconducting fault current limiter into the neutral line of power system

Publications (2)

Publication Number Publication Date
KR20090120766A true KR20090120766A (en) 2009-11-25
KR100981257B1 KR100981257B1 (en) 2010-09-10

Family

ID=41603959

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020080046727A KR100981257B1 (en) 2008-05-20 2008-05-20 Fault current limiting method through the application of superconducting fault current limiter into the neutral line of power system

Country Status (1)

Country Link
KR (1) KR100981257B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160052229A (en) * 2014-11-04 2016-05-12 두산중공업 주식회사 Generator protection apparatus and method
CN107317320A (en) * 2017-08-28 2017-11-03 李景禄 A kind of switching overvoltage damped method for failure phase transfer earthing or grounding means
CN108173264A (en) * 2017-12-29 2018-06-15 国电南瑞科技股份有限公司 A kind of Optimal Configuration Method of fault current limiter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100441955B1 (en) * 2001-12-24 2004-07-27 한국전력공사 quench controllor of hybrid type superconducting fault current limiters for their serial connection
AU2003903489A0 (en) * 2003-07-07 2003-07-17 Metal Manufactures Limited Superconductor current limiting system and method
KR100493333B1 (en) * 2003-10-17 2005-06-07 한국전력공사 Superconducting Parallel Circuit Using Superconducting Direct Transformer
KR200398633Y1 (en) 2005-07-21 2005-10-14 야베스텍 주식회사 Monitoring Device of disconnection for Reactor coil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160052229A (en) * 2014-11-04 2016-05-12 두산중공업 주식회사 Generator protection apparatus and method
CN107317320A (en) * 2017-08-28 2017-11-03 李景禄 A kind of switching overvoltage damped method for failure phase transfer earthing or grounding means
CN108173264A (en) * 2017-12-29 2018-06-15 国电南瑞科技股份有限公司 A kind of Optimal Configuration Method of fault current limiter

Also Published As

Publication number Publication date
KR100981257B1 (en) 2010-09-10

Similar Documents

Publication Publication Date Title
KR101037713B1 (en) Superconducting fault current limiter(sfcl) for fault current limiting and uninterruptible power supplying
KR20110002749A (en) Method for improvement of its recovery characteristics using a trigger of superconductor in a superconducting fault current limiter with magnetic coupling of two coils
US9762051B2 (en) Current-limiting and power-flow control device
US20170170648A1 (en) Protective device for protecting a transformer against geomagnetically induced currents
KR100981257B1 (en) Fault current limiting method through the application of superconducting fault current limiter into the neutral line of power system
WO2010149217A1 (en) Method for protecting transformers, and a transformer
US10218170B2 (en) Current-limiting device utilizing a superconductor for a current-limiting operation
RU2416852C1 (en) Power damper for limitation of emergency current
Mircea et al. Analyzing the efficiency of neutral treatment with resistor and shunt circuit breaker in a MV distribution substation
KR100959661B1 (en) Superconducting fault current limiter using magnetic coupling for protection coordination with protective device of power system
KR20150085367A (en) Apparatus for reducing asymmetric fault current using superconducting fault current limiter and method thereof
JPS605727A (en) Defect current breaking system
EP4125200B1 (en) Improvements in or relating to line commutated converters
Liu et al. Application of auto-reclosing residual current device in lightning protection for communications power supply
Axente et al. Protection of DVR against short circuit faults at the load side
Mekić et al. Adaptive Features of Numerical Differential Relays
KR102038263B1 (en) Inductive element protection in power supply systems
JP2010040326A (en) Ground fault interrupter
Sridhar et al. Integration of unique switch type Fault Current Limiter to mitigate the power quality problems in distribution system
JPH07177743A (en) Controller for ac-dc converter
KR20190044298A (en) System for protrecting power system including phase relay
CN113078622A (en) Resistance type direct current magnetic biasing suppression system
SU56907A1 (en) Device for protection of networks with isolated zero point from earth faults
JPH11150858A (en) System interconnection equipment and current limiting method therefor
JPH07236226A (en) Ground protector

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20130620

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20140709

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20150609

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20160627

Year of fee payment: 7

FPAY Annual fee payment

Payment date: 20170703

Year of fee payment: 8

LAPS Lapse due to unpaid annual fee