KR20080056596A - Analytic method for fault location of underground power cable - Google Patents

Analytic method for fault location of underground power cable Download PDF

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KR20080056596A
KR20080056596A KR1020060129686A KR20060129686A KR20080056596A KR 20080056596 A KR20080056596 A KR 20080056596A KR 1020060129686 A KR1020060129686 A KR 1020060129686A KR 20060129686 A KR20060129686 A KR 20060129686A KR 20080056596 A KR20080056596 A KR 20080056596A
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current
voltage
power cable
underground power
cable
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KR1020060129686A
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Korean (ko)
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KR100912065B1 (en
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민상원
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한국전기연구원
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Abstract

A method for indicating a fault location of an underground power cable is provided to indicate an error state and a fault location of the power cable by using characteristics of a shielding layer impedance matrix. An impedance per unit length of an underground power cable is received from a cable provider, and a voltage and a current are measured at both ends of the defective underground power cable(S10). An estimated fault location is determined and the voltage and the current are measured at both ends of a power transmission system. Harmonics and distortion components are removed from the voltage and current by using a LPF(S20). The voltage and the current from the LPF(Low Pass Filter) are Fourier-transformed, such that a basic component is extracted(S30). A defective point is determined by using an impedance analysis method using a relation between a voltage and a current of a basic wave(S40).

Description

지중 전력 케이블의 고장점 표정 방법{analytic method for fault location of underground power cable}{Analytic method for fault location of underground power cable}

도 1은 지중 전력 케이블의 일반적인 내부 구조도이다.1 is a general internal structure diagram of an underground power cable.

도 2는 3상 지중 송전 시스템의 단선도이다.2 is a schematic diagram of a three-phase underground power transmission system.

도 3은 본 발명에 따른 지중 전력 케이블의 고장점 표정 절차도이다.3 is a flowchart illustrating a failure point expression of the underground power cable according to the present invention.

본 발명은 지중 전력 케이블의 고장점 표정 방법에 관한 것으로, 특히 디지털 계전기에 의하여 측정된 지중 전력 케이블의 전압 및 전류를 이용하여 얻어지는 차폐층 임피던스 행렬의 특이성을 이용하여 상기 지중 전력 케이블의 고장 여부 및 고장점을 표정할 수 있는 지중 전력 케이블의 고장점 표정 방법에 관한 것이다.The present invention relates to a method of identifying a failure point of underground power cables, and in particular, whether or not the underground power cable is broken by using the specificity of the shielding layer impedance matrix obtained by using the voltage and current of the underground power cable measured by the digital relay. The present invention relates to a fault point expression method of underground power cables capable of expressing a fault point.

가공 선로는 각종 외부 사고에 노출되어 있으며 도시 미관도 해치기 때문에 지중 전력 케이블의 설치가 증가되고 있다. 지중 케이블은 자연재해로 인한 사고를 줄임으로써 전력 계통의 신뢰도 향상에 도움이 된다. Overhead lines are exposed to various external accidents and damage the city's aesthetics, so the installation of underground power cables is increasing. Underground cables help improve the reliability of power systems by reducing accidents caused by natural disasters.

그러나 일단 사고가 발생하면 복구하기 위한 시간 및 비용 소모가 크다. 게 다가 지중 케이블은 가공 선로에 비하여 복잡한 구조로 인하여 정확한 사고 지점을 찾기가 어려운 점이 있다. However, once an accident occurs, time and money are required to recover. In addition, underground cables have difficulty in finding the exact point of accident due to the complicated structure compared to overhead lines.

선로에 흐르는 전류와 전압, 그리고 선로의 임피던스를 이용하여 해석적으로 고장 거리를 계산 방법은 가공 선로에서는 보편화된 방법이다. 지중 케이블의 경우에는 도 1에 도시된 바와 같이, 한 상에 심선과 차폐층 등 두 가지 이상의 도체가 존재하고 상호 연관되어 있으며 고장 종류 별로 각기 다른 전기 회로가 구성되기 때문에 해석적 방법으로 고장 거리 추정하는 것은 매우 힘들다.Analytical failure distance calculation method using current and voltage flowing in line and impedance of line is common method in overhead line. In the case of underground cable, as shown in FIG. 1, two or more conductors such as a core wire and a shielding layer exist in one phase and are related to each other, and a failure distance is estimated by analytical method because different electric circuits are configured for each type of failure. It's very hard to do.

지중 전력 케이블 양단에서의 고장점 표정은 건전상과 사고상을 단락시켜서 사고 지점에서 측정점까지의 저항값과 건전상을 포함한 사고지점까지의 저항값과의 비를 통해서 사고 거리를 추정하는 머레이 루프법과 사고 발생 시 생성되는 파형의 도착 시간과 파형의 속도를 이용하여 사고 거리를 측정하는 진행파법이 있다. The expression of fault points at both ends of underground power cables is based on the Murray loop method, which estimates the fault distance by shorting the sound and accident phases and estimating the distance between faults from the fault point and the measured point and the resistance value from the fault point including the sound phase. There is a traveling wave method that measures the distance of an accident using the arrival time and the speed of the waveform generated when an accident occurs.

상기 머레이 루프법은 고장점 표정에 앞서 준비 작업이 필요하여 30분 이상 걸리는 단점이 있으며 진행파법의 경우 사고 파형의 속도가 매우 빠르고 사고 파형의 검출이 쉽지 않은 단점을 가지고 있다.The Murray loop method has a disadvantage that it takes more than 30 minutes to prepare the fault before the expression of the fault point, and in the case of the traveling wave method, the speed of the accident waveform is very fast and the detection of the accident waveform is not easy.

이와 같이 지중 케이블 송전 시스템의 사고 시 말단에서 사고지점을 찾고자 할 때 추가적인 장비의 설치가 필요하여 사고점을 찾는 데에 걸리는 시간이 오래 걸리고, 지중 케이블의 구조적인 복잡성으로 인하여 해석적인 방법으로 사고점을 구하기 어려워서 기존 임피던스 계전기의 취득 정보만으로는 고장점 표정이 어려운 단점을 안고 있다.As such, when it is necessary to find the accident point at the end of the underground cable transmission system, it takes a long time to find the accident point due to the installation of additional equipment, and due to the structural complexity of the underground cable, Since it is difficult to obtain, only the information obtained from the existing impedance relay has a disadvantage that it is difficult to look at the point of failure.

본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위하여 창안된 것으로, 디지털 계전기에 의하여 측정된 지중 전력 케이블의 전압 및 전류를 이용하여 얻어지는 차폐층 임피던스 행렬의 특이성을 이용하여 상기 지중 전력 케이블의 고장 여부 및 고장점을 표정할 수 있는 지중 전력 케이블의 고장점 표정 방법을 제공하는 것을 그 목적으로 한다.The present invention has been made to solve the above problems of the prior art, the failure of the underground power cable by using the specificity of the shielding layer impedance matrix obtained by using the voltage and current of the underground power cable measured by the digital relay It is an object of the present invention to provide a method of expressing a fault point of an underground power cable capable of expressing whether or not a fault is present.

상기와 같은 기술적 과제를 해결하기 위하여 제안된 본 발명인 지중 전력 케이블의 고장점 표정 방법을 이루는 구성수단은, 지중 전력 케이블의 양단에서 전압과 전류를 측정하는 단계, 상기 측정된 전압과 전류에 포함된 고조파 및 외란을 저역필터에 의하여 제거한 후, 푸리에 변환을 통하여 기본파 성분을 추출하는 단계, 상기 기본파 성분인 전압 및 전류 사이의 관계식을 이용하여 임피던스 해석법으로 고장점을 표정하는 단계를 포함하여 이루어진 것을 특징으로 한다.In order to solve the technical problem as described above, the constituent means of the fault point expression method of the underground power cable according to the present invention includes the steps of measuring voltage and current at both ends of the underground power cable; After the harmonics and disturbances are removed by the low pass filter, extracting the fundamental wave components through a Fourier transform, and expressing a fault point by an impedance analysis method using the relationship between the voltage and the current as the fundamental wave components. It is characterized by.

또한, 상기 고장점을 표정하는 단계는, 상기 기본파 성분인 전압 및 전류 사이의 관계식을 이용하여 차폐층 임피던스 행렬을 생성하는 과정, 상기 생성된 차폐층 임피던스 행렬의 특이성을 이용하여 지중 전력 케이블의 고장 여부 및 고장점의 거리를 추정하는 과정을 포함하여 이루어진 것을 특징으로 한다.In addition, the expression of the failure point, the process of generating a shielding layer impedance matrix using the relationship between the voltage and current which is the fundamental wave component, using the specificity of the generated shielding layer impedance matrix of the underground power cable Characterized in that it comprises a process of estimating the failure and the distance of the failure point.

이하, 첨부된 도면을 참조하여 상기와 같은 구성수단으로 이루어져 있는 본 발명인 지중 전력 케이블의 고장점 표정 방법에 관한 바람직한 실시예를 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the method for the expression of the failure point of the underground power cable of the present invention consisting of the above configuration means.

본 발명은 지중 전력 케이블의 고장점 표정 방법에 관한 것인데, 상기 지중 전력 케이블의 구조는 도 1에 도시된 바와 같다. 현재 우리나라 계통에 주로 쓰이는 OF케이블과 XLPE케이블은 기본적으로 구조가 유사하며, 단지 절연체의 재질과 r1의 존재 여부(OF케이블은 도 1과 같이 중앙이 뚫린 구조이며 XLPE케이블은 꽉 찬 구조이다)가 다를 뿐이다.The present invention relates to a method of expression of a fault point of the underground power cable, the structure of the underground power cable is as shown in FIG. Currently, OF cable and XLPE cable which are mainly used in Korean system are basically similar in structure, and only the material of insulator and the existence of r 1 (OF cable is a center-opened structure as shown in Fig. 1, and XLPE cable is full structure). Is different.

도 2에 도시된 바와 같이 상기 지중 전력 케이블을 이용한 3상 시스템인 경우에는 심선 도체와 금속 차폐층으로 인하여 마치 6상처럼 각기 다른 전류가 흐르게 되기 때문에, 기존의 3상 시스템 해석법으로는 대상 시스템은 해석하기 어렵기 때문에 본 발명이 더욱 요청되는 것이다.As shown in FIG. 2, in the case of a three-phase system using the underground power cable, different currents flow like six phases due to the core conductor and the metal shielding layer. The present invention is further requested because it is difficult to interpret.

본 발명은 기존에 널리 설치가 되어 있는 임피던스 계전기와 유사한 입력, 즉 대상 시스템의 전압과 전류값을 이용한다. 기존 임피던스 계전기의 알고리즘과 마찬가지로 본 발명의 알고리즘은 이러한 신호를 저역필터를 통해 기본파 이외의 고조파 및 외란을 제거한 후 푸리에 변환을 통해서 시스템 해석을 수행하고자 한다.The present invention utilizes an input similar to an impedance relay that is widely installed, that is, voltage and current values of a target system. Like the algorithm of the conventional impedance relay, the algorithm of the present invention attempts to perform the system analysis through the Fourier transform after removing harmonics and disturbances other than the fundamental wave through the low pass filter.

도 3을 참조하여 본 발명에 따른 지중 전력 케이블의 고장점 표정 방법에 대하여 구체적으로 설명하면 다음과 같다.Referring to Figure 3 with reference to the fault point expression method of the underground power cable according to the present invention in detail.

먼저, 지중 전력 케이블의 단위 길이 당 임피던스는 케이블 공급업체로부터 주어진 정보를 이용하고, 사고가 발생한 지중 전력 케이블의 양단에서 전압과 전류를 측정한다(S10). 즉, 송전단(도 2에서 S 지점)에서 xm 만큼 떨어진 곳(도 2에서 F 지점)에서의 사고를 가정하여 송전 시스템 양단에서 전압과 전류를 측정한다.First, the impedance per unit length of the underground power cable using the information given from the cable supplier, and measures the voltage and current at both ends of the underground power cable in the accident (S10). That is, voltage and current are measured at both ends of the power transmission system assuming an accident at an xm distance (point F in FIG. 2) from the power transmission end (point S in FIG. 2).

상기 측정된 전압과 전류에는 많은 고조파와 외란이 포함되어 있기 때문에, 저역 필터에 의하여 상기 측정된 전압과 전류에 포함된 고조파 및 외란 성분을 제거한다(S20). 그리고, 상기 저역 필터를 통과한 전압과 전류를 푸리에 변환을 통하여 기본파 성분만을 추출하게 된다(S30).Since the harmonics and disturbances are included in the measured voltages and currents, the harmonics and disturbances included in the measured voltages and currents are removed by the low pass filter (S20). Then, only the fundamental wave components are extracted through the Fourier transform of the voltage and the current passing through the low pass filter (S30).

상기와 같이, 저역 필터와 푸리에 변환을 사용하여 기본파 성분을 추출한 후, 전압과 전류 사이의 관계식을 표현하면 아래의 식 1과 같다. 이 때 양단은 완전접지가 되어 있는 것으로 본다.As described above, after extracting a fundamental wave component using a low pass filter and a Fourier transform, the relation between voltage and current is expressed by Equation 1 below. Both ends are considered to be fully grounded.

Figure 112006093753726-PAT00001
- 식 1 -
Figure 112006093753726-PAT00001
Equation 1

상기 첨자 중, 소문자 a,b,c는 전압, 전류의 상(phase)을 표현하고, 대문자 S, R은 송전단(Sending-end), 수전단(Receiving-end)를 표현하며, sheath는 차폐층의 전압, 전류를 나타낸다.Among the subscripts, the lowercase letters a, b, and c represent phases of voltage and current, the uppercase letters S and R represent sending-ends and receiving-ends, and sheath is shielded. The voltage and current of the layer are shown.

상기 식 1에서 각 인자들은 다음과 같은 뜻을 의미한다.In Equation 1, each factor means the following meaning.

Figure 112006093753726-PAT00002
; 도 2의 송전단에서 측정된 a상 케이블 심선의 전압
Figure 112006093753726-PAT00002
; Voltage of the a-phase cable core wire measured at the transmission end of FIG.

Figure 112006093753726-PAT00003
; 도 2의 송전단에서 측정된 b상 케이블 심선의 전압
Figure 112006093753726-PAT00003
; Voltage of the b-phase cable core wire measured at the transmission end of FIG.

Figure 112006093753726-PAT00004
; 도 2의 송전단에서 측정된 c상 케이블 심선의 전압
Figure 112006093753726-PAT00004
; Voltage of the c-phase cable core wire measured at the transmission end of FIG.

Figure 112006093753726-PAT00005
; 송전단에서의 a상 케이블 차폐층의 전압
Figure 112006093753726-PAT00005
; Voltage of a-phase cable shielding layer at the transmission end

Figure 112006093753726-PAT00006
; 송전단에서의 a상 케이블 차폐층의 전압
Figure 112006093753726-PAT00006
; Voltage of a-phase cable shielding layer at the transmission end

Figure 112006093753726-PAT00007
; 송전단에서의 a상 케이블 차폐층의 전압
Figure 112006093753726-PAT00007
; Voltage of a-phase cable shielding layer at the transmission end

Figure 112006093753726-PAT00008
; 송전단에서 측정된 수전단으로 흐르는 a상 케이블 심선의 전류
Figure 112006093753726-PAT00008
; Current of the a-phase cable core wire flowing from the power transmitter to the power receiver

Figure 112006093753726-PAT00009
; 송전단에서 측정된 수전단으로 흐르는 b상 케이블 심선의 전류
Figure 112006093753726-PAT00009
; Current in the b-phase cable core wire flowing from the transmitter to the receiver

Figure 112006093753726-PAT00010
; 송전단에서 측정된 수전단으로 흐르는 c상 케이블 심선의 전류
Figure 112006093753726-PAT00010
; Current in the c-phase cable core wire flowing from the transmitter to the receiver

Figure 112006093753726-PAT00011
; 수전단으로 흐르는 송전단에서의 a상 케이블 차폐층 전류
Figure 112006093753726-PAT00011
; Phase-c cable shielding layer current at power transmission stage

Figure 112006093753726-PAT00012
; 수전단으로 흐르는 송전단에서의 b상 케이블 차폐층 전류
Figure 112006093753726-PAT00012
; B-phase cable shielding layer current in power transmission stage

Figure 112006093753726-PAT00013
; 수전단으로 흐르는 송전단에서의 c상 케이블 차폐층 전류
Figure 112006093753726-PAT00013
; C-phase cable shielding layer current in power transmission stage

Figure 112006093753726-PAT00014
; 수전단에서 측정된 송전단으로부터 흘러오는 a상 케이블 심선의 전류
Figure 112006093753726-PAT00014
; Current in the a-phase cable core wire flowing from the power stage measured at the power stage

Figure 112006093753726-PAT00015
; 수전단에서 측정된 송전단으로부터 흘러오는 b상 케이블 심선의 전류
Figure 112006093753726-PAT00015
; Current in the b-phase cable core wire flowing from the power stage measured at the power stage

Figure 112006093753726-PAT00016
; 수전단에서 측정된 송전단으로부터 흘러오는 c상 케이블 심선의 전류
Figure 112006093753726-PAT00016
; Current in the c-phase cable cores flowing from the power stage measured at the power stage

Figure 112006093753726-PAT00017
; 송전단으로부터 흘러오는 수전단에서의 a상 케이블 차폐층 전류
Figure 112006093753726-PAT00017
; Phase A cable shielding layer current at the receiving end flowing from the transmitting end

Figure 112006093753726-PAT00018
; 송전단으로부터 흘러오는 수전단에서의 b상 케이블 차폐층 전류
Figure 112006093753726-PAT00018
; B-phase cable shielding layer current at the receiving end from the transmission end

Figure 112006093753726-PAT00019
; 송전단으로부터 흘러오는 수전단에서의 c상 케이블 차폐층 전류
Figure 112006093753726-PAT00019
; Phase-c cable shielding layer current at the receiving end flowing from the transmitting end

다음은 상기와 같은 기본파 성분인 전압 및 전류 사이의 관계식을 이용하여 임피던스 해석법으로 고장점을 표정한다(S40). 고장점을 표정하는 과정에 대하여 더 구체적으로 설명하면 다음과 같다.Next, the failure point is expressed by an impedance analysis method using the relationship between the voltage and the current which are the fundamental wave components (S40). The process of expressing a fault point is described in more detail as follows.

상기 식 1을 차폐층 전류에 관하여 정리하면 아래 식 2와 같다.Summarizing Equation 1 with respect to the shielding layer current, Equation 2 is as follows.

Figure 112006093753726-PAT00020
- 식 2 -
Figure 112006093753726-PAT00020
Equation 2

상기 식 2에서,In Equation 2,

Figure 112006093753726-PAT00021
이고,
Figure 112006093753726-PAT00022
는 6x6 행렬이고,
Figure 112006093753726-PAT00023
는 6x1 행렬이며, 모든 원소는 x에 관한 1차식이다. 그리고 식(2)에서,
Figure 112006093753726-PAT00024
는 송전단과 수전단 양단에서의 차폐층 전류 벡터를 의미한다.
Figure 112006093753726-PAT00021
ego,
Figure 112006093753726-PAT00022
Is a 6x6 matrix,
Figure 112006093753726-PAT00023
Is a 6x1 matrix, and all elements are linear in relation to x. And in equation (2),
Figure 112006093753726-PAT00024
Denotes a shielding layer current vector at both ends of the transmission and reception terminals.

상기 식 1 및 식2를 이용하여

Figure 112006093753726-PAT00025
행렬을 구한다. 상기
Figure 112006093753726-PAT00026
행렬을 차폐층 임피던스 행렬이라 정의한다. 즉, 상기 기본파 성분인 전압 및 전류 사이의 관계식을 이용하여 차폐층 임피던스 행렬인
Figure 112006093753726-PAT00027
를 생성한다.Using Equations 1 and 2 above
Figure 112006093753726-PAT00025
Find the matrix. remind
Figure 112006093753726-PAT00026
The matrix is defined as a shielding layer impedance matrix. That is, the shielding layer impedance matrix is expressed by using the relation between voltage and current which are fundamental wave components.
Figure 112006093753726-PAT00027
Create

그런 다음, 상기 생성된 차폐층 임피던스 행렬의 특이성을 이용하여 지중 전력 케이블의 고장 여부 및 고장점의 거리를 추정한다.Then, the specificity of the generated shielding layer impedance matrix is used to estimate the failure of the underground power cable and the distance of the failure point.

상기 차폐층 임피던스 행렬인

Figure 112006093753726-PAT00028
행렬의 랭크(Rank)는 사고 거리 x에 무관하기 때문에, 식 2의 해는 무수히 많거나 존재하지 않는다. 사고 거리 x의 해가 존재하기 위해서는
Figure 112006093753726-PAT00029
의 각 원소의 비가
Figure 112006093753726-PAT00030
의 각 행 간의 비와 같아야 한다. The shielding layer impedance matrix
Figure 112006093753726-PAT00028
Since the rank of the matrix is independent of the accident distance x, the solution of Equation 2 is numerous or absent. In order for the solution of accident distance x to exist,
Figure 112006093753726-PAT00029
Ratio of each element of
Figure 112006093753726-PAT00030
It must be equal to the ratio between each row of.

이 성질을 이용하면 주어진 문제, 즉 케이블 송전계통에서의 고장점 표정은 단순한 1차 연립방정식으로 표현되어 사고 거리 x는 명백한 해(Explicit Solution) 형태로 표현되기 때문에, 고장점을 명확하게 표정할 수 있다.With this property, a given problem, that is, the fault point expression in the cable transmission system, is expressed as a simple linear system, and the distance x is expressed in the form of an explicit solution. have.

상기와 같은 구성 및 바람직한 실시예를 가지는 본 발명인 지중 전력 케이블의 고장점 표정 방법에 의하면, 디지털 계전기에 의하여 측정된 지중 전력 케이블의 전압 및 전류를 이용하여 얻어지는 차폐층 임피던스 행렬의 특이성을 이용하여 상기 지중 전력 케이블의 고장 여부 및 고장점을 표정할 수 있다. 즉, 디지털 계전기로 취득 가능한 전압 및 전류 정보만을 이용하기 때문에 추가적인 장비가 필요 없으며 Explicit Solution 형태이므로 계산 시간이 짧아 디지털 계전기에 쉽게 적용할 수 있는 장점이 있다.According to the fault point expression method of the underground power cable of the present invention having the configuration and the preferred embodiment as described above, by using the specificity of the shielding layer impedance matrix obtained by using the voltage and current of the underground power cable measured by the digital relay It is possible to express whether the underground power cable is broken or not. That is, since only the voltage and current information that can be acquired by the digital relay is used, no additional equipment is required, and since it is an explicit solution type, the calculation time is short, so it can be easily applied to the digital relay.

Claims (2)

지중 전력 케이블의 고장점 표정 방법에 있어서,In the fault point expression method of the underground power cable, 지중 전력 케이블의 양단에서 전압과 전류를 측정하는 단계;Measuring voltage and current at both ends of the underground power cable; 상기 측정된 전압과 전류에 포함된 고조파 및 외란을 저역필터에 의하여 제거한 후, 푸리에 변환을 통하여 기본파 성분을 추출하는 단계;Removing harmonics and disturbances included in the measured voltage and current by a low pass filter, and then extracting fundamental wave components through a Fourier transform; 상기 기본파 성분인 전압 및 전류 사이의 관계식을 이용하여 임피던스 해석법으로 고장점을 표정하는 단계를 포함하여 이루어진 것을 특징으로 하는 지중 전력 케이블의 고장점 표정 방법.Using a relationship between voltage and current which is the fundamental wave component. 청구항 1에 있어서, 상기 고장점을 표정하는 단계는,The method of claim 1, wherein the step of expressing the fault point, 상기 기본파 성분인 전압 및 전류 사이의 관계식을 이용하여 차폐층 임피던스 행렬을 생성하는 과정, 상기 생성된 차폐층 임피던스 행렬의 특이성을 이용하여 지중 전력 케이블의 고장 여부 및 고장점의 거리를 추정하는 과정을 포함하여 이루어진 것을 특징으로 하는 지중 전력 케이블의 고장점 표정 방법.A process of generating a shielding layer impedance matrix using a relation between voltage and current, which is the fundamental wave component, and estimating the failure of the underground power cable and the distance of the fault point using the specificity of the generated shielding layer impedance matrix The fault point expression method of the underground power cable, characterized in that consisting of.
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