WO2016178447A1 - 케이블 고장 진단 방법 및 시스템 - Google Patents
케이블 고장 진단 방법 및 시스템 Download PDFInfo
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- WO2016178447A1 WO2016178447A1 PCT/KR2015/004571 KR2015004571W WO2016178447A1 WO 2016178447 A1 WO2016178447 A1 WO 2016178447A1 KR 2015004571 W KR2015004571 W KR 2015004571W WO 2016178447 A1 WO2016178447 A1 WO 2016178447A1
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- signal
- correction
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- cable
- fault
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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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
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
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- the present invention relates to a method and a system for diagnosing a cable failure, and more particularly, to detecting a cable failure type and a failure location based on an applied signal supplied to a cable to be diagnosed and a reflected signal obtained.
- a system and method capable of detecting a failure type and a location of a failure.
- Such a diagnosis and location measurement technology of the wire conduction that is, the wiring diagnostic system, until now, is a reflection wave measurement method (Reflectometry) for diagnosing the abnormality of the wire by measuring a reflected signal after transmitting a certain signal to the wire To achieve.
- Reflectometry Reflectometry
- the reflected wave measuring method is performed only in the time domain or the frequency domain, and transmits a constant applied signal to the conductive wire, and measures the reflected signal returned from the reflected wire, such as open, short, discontinuity, etc. of the conductive wire.
- Conventional reflection measurements which measure the presence or absence of faults, the location of defects, and the characteristic impedance of the conductors, include time domain reflectometry (TDR), standing wave reflectometry (SWR), and frequency domain reflectometry ( Various methods such as frequency domain reflectometry (FDR) have been studied.
- the proximity between the fault position and the applied position may cause overlap of the applied signal and the reflected signal, Due to the weakness of the reflected signal due to the far distance of the applied position, a distance measurement error rate may occur, or the accuracy of the coupling distance measurement may be degraded, resulting in a limit in accuracy and reliability of the diagnostic result of the cable.
- the present invention proposes a method for detecting a failure type and a failure location of a cable to be diagnosed based on a correction signal and a reflection signal from which an applied signal is removed.
- the present invention has been made to solve such a problem, and an object of the present invention is to detect a failure location and a failure type of a cable under test based on an applied signal supplied to a cable under test and a reflection signal obtained.
- an applied signal and the reflected signal overlap due to the proximity of the applied position and the applied position or the distance of the applied position from the fault position and the applied position is out of the fault diagnosis range due to the weak strength of the reflected signal, the applied signal and the acquired reflection supplied to the cable to be inspected.
- An application signal generation unit generating an application signal reflecting a predetermined Gaussian envelope linear chirp signal and applying the same to a test target cable through a reflection panel measurement method selected from a plurality of reflection plate measurement methods;
- a reflection signal receiving unit which receives a reflection signal acquired from the inspection target cable;
- an operation unit for deriving an abnormal occurrence position and an abnormal state of the cable to be inspected through a time domain analysis of the applied signal and the reflected signal of the signal generator.
- the calculation unit calculates
- the reflected wave measurement method Preferably the reflected wave measurement method
- STDR Sequence Time Domain Reflectometry
- SSTDR Spread Spectrum Time Domain Reflectometry
- a time correlation module for deriving a correction position at which a function value derived from the correlation function of the applied signal and the reflected signal has a maximum maximum value, and generating a correction signal based on the reflected signal from which the applied signal of the correction position is removed;
- Deriving the time delay value based on the correction signal and the reflection signal generated by the time correlation module derives the distance between the correction position and the acquisition position based on the time delay value and the propagation speed to determine the abnormal occurrence position and abnormal state of the cable to be inspected. It is characterized in that it comprises a calculation module for deriving.
- the time correlation module Preferably the time correlation module,
- a first time correlator for deriving a correction position at which a predetermined correlation function value has a maximum maximum value based on the applied signal and the reflected signal;
- a second time correlator for generating a correction signal based on the reflected signal from which the applied signal at the correction position is removed.
- the first time correlator Preferably, the first time correlator,
- the calculated correlation function value is characterized in that it is provided to derive a correction position having a maximum maximum value.
- the second time correlator is
- a correction signal which is a reflected signal from which the applied signal at the corrected position is removed based on the difference between the applied signal at the corrected position and the reflected signal.
- calculation module calculates the calculation module
- the computing device of the cable failure diagnosis system according to another aspect of the present invention for achieving this object,
- the reflection plate measurement method selected among the plurality of reflection plate measurement methods derives a correction position having a maximum maximum value from a predetermined correlation function for the applied signal reflecting the predetermined Gaussian envelope linear chirp signal and the acquired reflected signal, and the applied signal of the corrected position and A time correlation module for generating a correction signal based on the acquired reflected signal,
- a calculation module for deriving a time delay value based on the correction signal and the reflection signal generated by the time correlation module to derive the occurrence position and abnormal state of the cable based on the time delay value and the propagation speed.
- the time correlation module Preferably the time correlation module,
- a first time correlator for deriving a correlation function value in the time domain for the applied signal and the reflected signal generated from the applied signal generator and deriving a correction position at which the derived correlation function value has a maximum maximum value
- a second time correlator for generating a correction signal which is a reflected signal from which the applied signal is removed at the correction position based on the difference between the applied signal at the correction position and the reflected signal.
- calculation module is
- the plurality of reflected wave measurement method Preferably the plurality of reflected wave measurement method
- STDR Sequence Time Domain Reflectometry
- SSTDR Spread Spectrum Time Domain Reflectometry
- the derivation position where the correlation function has the maximum maximum value is derived from the applied signal reflecting the predetermined Gaussian envelope linear chirp signal and the predetermined correlation function for the acquired reflection signal, and applied from the derived correction position.
- the fault position and the applied position are calculated by calculating a correction signal that is a reflected signal from which the signal is removed and deriving a distance between the corrected position and the acquired position based on the calculated time delay and propagation speed based on the calculated corrected signal and the reflected signal of the acquired position.
- the proximity distance of the Even in the case of a bundle it is possible to accurately detect the failure type and the failure location of the cable to be inspected.
- the reflected signal strength is weak due to the long distance between the failure location and the applied location or the degree of failure is weak, It has the advantage of improving the accuracy and reliability of fault type and fault location detection.
- FIG. 1 is a diagram showing the configuration of a cable failure diagnosis system according to an embodiment of the present invention.
- FIG. 2 is a block diagram illustrating a calculation unit of a cable failure diagnosis system according to an exemplary embodiment of the present invention.
- FIG. 3 is a diagram illustrating output waveforms of each unit of a calculation unit of a cable failure diagnosis system according to an exemplary embodiment of the present invention.
- FIG. 4 is a waveform diagram illustrating a signal of a cable failure remaining system to which an embodiment of the present invention is applied.
- FIG. 5 is a flowchart illustrating a cable failure diagnosis process according to another embodiment of the present invention.
- FIG. 1 is a view showing a cable failure diagnosis system according to an embodiment of the present invention
- Figure 2 is a view showing the configuration of the calculation unit shown in Figure 1, with reference to Figures 1 and 2
- the cable fault diagnosis system according to the present invention is described.
- the fault position and the failure type of the cable are determined by observing the phases of the received and reflected signals received from the applied position and the acquired position. Fault location and failure type by observing the phase with the acquisition time reflected from the fault location after spreading the band and applying a phase shift modulated signal using a sequence time reflectometry (STDR) or a sequence having excellent autocorrelation performance. Gaussian enveloped linear chirp signal generated using reflector metrology selected from Spread Spectrum Time Reflectometry (SSTDR)
- the applied signal s (t) which increases in frequency linearly with time, is supplied to the cable to be inspected, and the applied signal s (t) is acquired after propagating through the cable. After analyzing the time information is provided to diagnose the failure location and type of failure of the cable to be inspected.
- the applied signal propagates in the cable to be inspected, the amplitude is attenuated and the phase is distorted according to the characteristics of the cable.
- the degree of attenuation of the magnitude of the applied signal and the degree of deformation of the phase depend on the frequency and distance of the signal, and the propagation coefficient of the cable is reflected.
- a predetermined failure may be caused by overlapping of an application signal and a reflection signal due to a proximity between a failure position and an application position, or due to a weak strength of the reflection signal due to a far distance between the failure position and the application position. If it is out of the diagnostic range, the correlation function for the predefined applied signal and the reflected signal derives the correction position having the maximum maximum value, calculates the correction signal which is the reflected signal from which the applied signal is removed from the derived correction position, A system is provided to derive a failure location and a failure type of the cable to be inspected based on the reflected signal.
- the system includes an application signal generator 100, a reflection signal receiver 200, and a calculator 300.
- the applied signal generator 100 is based on a chirp signal whose frequency varies linearly with time generated by using a reflector measuring method selected from a sequence time reflectometry (STDR) or a spread spectrum time reflectometry (SSTDR). Generate an application signal s (t).
- STDR sequence time reflectometry
- SSTDR spread spectrum time reflectometry
- the parameter for the authorization signal s (t) is generated through GIPB programming of the device control program means.
- the series of processes of generating and localizing the chirp signal through GPIB programming in the application signal generator 100 is generally the same as or similar to the process of generating an arbitrary waveform.
- the generation of the application signal s (t) proceeds along the lead of the cable to be inspected, and when a failure position of the cable to be inspected is reached, a part of the application signal s (t) is transmitted according to the reflection coefficient. Part of the application signal s (t) is reflected.
- the operation unit 300 may consider the time delay value ( ⁇ D ), which is a time difference between the application position of the application signal s (t) and the acquisition position of the reflection signal r (t), to determine the inspection target cable. For example, as the time delay value ⁇ D increases, it may be determined that a failure occurs in the cable state.
- the calculation unit 300 may calculate a time delay value ⁇ based on a function value of a predefined correlation function R ST ( ⁇ ) with respect to the applied signal s (t) and the reflected signal r (t). D ) to derive a distance d between an application position and an acquisition position based on the time delay value ⁇ D and the predetermined propagation speed v P , and the correlation function R ST ( ⁇ ) and the distance. (d) satisfies the following equations 1) and 2).
- SSTDR Session-to-Stet
- < <
- RTI ID 0.0 >
- the operation unit 300 has a maximum maximum value of a function value of a predetermined correlation function (R ST ( ⁇ )) with respect to the predefined application signal s (t) and the reflection signal r (t).
- the calculated correction position ( ⁇ 1), the corrected position of the correction signal (e (t) of the reflected signal is the signal (s (t- ⁇ 1) the removal of ( ⁇ 1) derived to derive a) and calculating a correction signal ( e (t)) and the reflected signal r (t) are provided to derive the fault location and fault type of the cable under test.
- the operation unit 300 has a maximum maximum value from the correlation function R ST ( ⁇ ) of the applied signal s (t) and the reflected signal r (t).
- a correction position ⁇ 1 is derived, and the correction signal e (t) is based on the applied scene s (t- ⁇ 1 ) of the correction position ⁇ 1 and the reflected signal r (t).
- the time delay value ⁇ D is derived based on the time correlation module 310 for generating a signal) and the correction signal e (t) and the reflection signal r (t) generated by the time correlation module.
- the calculation module 320 may further include a calculation module 320 for deriving an abnormal occurrence position and an abnormal state of the cable based on the delay value ⁇ D.
- the time correlation module 310 obtains a first time correlator 321 that derives a correction position at which a predetermined correlation function value has a maximum maximum value based on the applied signal and the reflected signal, and is obtained with the applied signal of the correction position. And a second time correlator 322 that generates a correction signal based on the reflected signal.
- the correction signal is a reflection signal from which an application signal at the correction position is removed.
- the first time correlator 321 has a maximum maximum correlation value based on a correlation function R ST ( ⁇ ) of the time domain for the applied signal and the reflected signal generated from the applied signal generator 100.
- the correction position ⁇ 1 is derived and the derived correction position ⁇ 1 is transmitted to the second time correlator 322.
- the second time correlator 322 is based on the difference between the applied signal s (t) and the reflected signal r (t) at the corrected position ⁇ 1 .
- the correction signal e (t) satisfies Equation 6 below.
- the correction signal e (t) is then transmitted to the calculation module 330.
- the calculation module 330 obtains an acquisition position having a maximum maximum value of the correlation function R ST ( ⁇ ) with respect to the correction signal e (t) and the reflection signal r (t) from Equation 1.
- ⁇ 2 ) is derived and a time delay value ⁇ p is derived based on the difference between the obtained acquisition position ⁇ 2 and the correction position ⁇ 1 .
- the calculation module 330 calculates the distance d between the correction position ⁇ 1 and the acquisition position ⁇ 2 of the correction signal based on the time delay value ⁇ p and the predetermined propagation speed v P from Equation 2 above. ).
- a series of processes for deriving the distance d between the correction position ⁇ 1 and the acquisition position ⁇ 2 based on the correction signal e (t) and the reflected signal r (t) is the application position.
- the position of the fault after applying the signal spread by spreading the band by using STDR (Sequence Time Reflectometry) reflector measurement method that determines the fault position and fault type by observing the phase of the acquisition point and the type of fault. It is the same or similar to reflector metrology in Spread Spectrum Time Domain Reflectormetry (SSTDR), which detects the failure location and type of failure by observing the phase of the acquisition time that is reflected back.
- SSTDR Spread Spectrum Time Domain Reflectormetry
- Figure 3 (a) is a waveform diagram showing the applied signal, (b) is a waveform showing a correction signal from which the applied signal is removed at the correction position, (c) is a time delay state derived based on the correction signal and the reflected signal This is a waveform diagram showing. As shown here, it can be seen that the distance between the corrected position and the acquired position of the reflected signal is 57.436 m.
- 4 is an output waveform diagram when an applied signal is a sequence of m having a magnitude of 1 and a length of 7, and there is one reflected signal whose variance of normal noise is 0.25 and the magnitude is reduced by half.
- the position of the half signal is unknown, but the maximum local value of the correlation function for the applied signal and the reflected signal is corrected. Since the position ⁇ 1 is 50 [ns] and the acquisition position ⁇ 2 of the maximum maximum value of the correlation function for the correction signal and the reflected signal is 200 [ns], the correction position ⁇ 1 and the reflected signal of the correction signal
- the time delay value ⁇ p which is the difference from the acquired position ⁇ 2 , is derived as 150 [ns].
- the distance d between the correction position and the acquisition position can be derived, and thus the failure position and failure type can be extracted.
- a correction position where a correlation function value has a maximum maximum value is derived based on a predetermined correlation function for the applied signal supplied to the inspection target cable and the acquired reflected signal, and is a reflected signal obtained by removing the applied signal from the derived correction position.
- the signal is calculated and the distance between the corrected position and the acquired position is derived based on the calculated time delay and propagation speed based on the calculated corrected signal and the reflected signal of the acquired position.
- FIG. 5 is a flowchart illustrating an operation process of the calculator illustrated in FIG. 2, and illustrates a cable failure diagnosis process according to another exemplary embodiment of the present disclosure with reference to FIGS. 1 to 2 and 5.
- the application signal generator 100 may include a Gaussian envelope linear chirp signal selected according to a reflector measuring method of one of STDR and SSTDR. Is generated and is applied to the cable to be inspected (step S1). In this case, the applied signal is generated by using a reflector measuring method selected from STDR and SSTDR.
- the reflected signal receiver 200 receives the reflected signal r (t) obtained from the cable to be inspected after the application signal s (t) is propagated (step S3).
- the time correlation module 310 of the operation unit 300 has a function value with respect to the predetermined correlation function R ST ( ⁇ ) with respect to the applied signal s (t) and the reflected signal r (t).
- a correction position ⁇ 1 having a maximum maximum value is derived, and a correction signal e (t) which is a reflected signal from which the applied signal s (t ⁇ 1 ) at the derived correction position ⁇ 1 is removed is obtained.
- Compute step S5.
- the correction signal e (t) is derived as the applied signal s (t- ⁇ 1 ) at the reflection signal r (t) -correction position ⁇ 1 (step S7).
- the operation module 320 of the operation unit 300 acquires a position at which a function value has a maximum maximum value based on a correlation function predefined for the correction signal e (t) and the reflection signal r (t). ( ⁇ 2 ) is derived and the time delay value ⁇ D is derived for the corrected position of the corrected signal and the acquired position ⁇ 2 of the reflected signal (steps S9 and S11).
- the calculation module 320 derives a distance d between the correction position and the acquisition position based on the time delay value ⁇ D and the propagation speed v P , and breaks the cable to be inspected based on the derived distance d.
- the position and the failure type are detected (steps S13 and S15).
- a correction position having a maximum maximum correlation value is derived and a correction signal which is a reflected signal from which the applied signal has been removed from the derived correction position.
- the distance between the correction position and the acquisition position is derived based on the calculated time delay and the propagation speed calculated based on the calculated correction signal and the reflection signal of the acquisition position.
- the steps of the method or algorithm described in connection with the embodiments presented herein may be embodied in the form of program instructions that may be executed by various computer means and recorded on a computer readable medium.
- the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.
- Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.
- Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks.
- Magneto-optical media and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like.
- program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
- the hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.
- the cable to be inspected can accurately detect the failure type and location of failure, and Cable failure diagnosis system that can improve the accuracy and reliability of the failure type of the cable under test and the detection of the failure location, even when the reflected signal strength is weak due to the long distance between the fault location and the applied location or the degree of the failure is weak.
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Claims (13)
- 다수의 반사판 계측법 중 선택된 반사판 계측법을 통해 기 정해진 가우시안 포락선 선형 처프 신호가 반영된 인가 신호를 발생하여 검사 대상 케이블에 인가하는 인가 신호 발생부; 상기 검사 대상 케이블로부터 취득되는 반사 신호를 수신하는 반사 신호 수신부; 상기 신호 발생부의 인가 신호 및 반사 신호에 대해 시간 영역의 분석을 통해 상기 검사 대상 케이블의 이상 발생 위치 및 이상 상태를 도출하는 연산부를 포함하고.상기 연산부는,고장 위치와 인가 위치의 근접으로 인해 인가 신호 및 반사 신호가 중첩되거나 고장 위치와 인가 위치의 원 거리로 인해 반사 신호의 세기가 미약하여 기 정해진 고장 진단 범위를 벗어나는 경우 상기 인가 신호 및 반사 신호에 대해 기 정해진 상관 함수로부터 도출된 함수값이 최대 극대값을 가지는 보정 위치를 도출하고,상기 취득되는 반사 신호에서 상기 보정 위치의 인가 신호가 제거된 보정 신호를 생성하며,생성된 보정 신호 및 반사 신호에 대해 기 정해진 상관 함수로부터 상기 보정 신호의 보정 위치와 반사 신호의 반사 위치 간의 시간 지연값을 도출한 후 도출된 지연 시간값 및 전파 속도를 토대로 보정 위치와 취득 위치 간의 거리를 도출하도록 구비되는 것을 특징으로 하는 케이블 고장 진단 시스템.
- 제1항에 있어서, 상기 반사파 계측법은,STDR(Sequence Time Domain Reflectometry) 및 SSTDR(Spread Spectrum Time Domain Reflectometry) 중 하나 인 것을 특징으로 하는 케이블 고장 진단 시스템.
- 제2항에 있어서, 상기 연산부는,상기 인가 신호 및 반사 신호의 상관 함수으로부터 도출된 함수값이 최대 극대값을 가지는 보정 위치를 도출하고, 상기 보정 위치의 인가 신호가 제거된 반사 신호를 토대로 보정 신호를 생성하는 시간 상관 모듈과,상기 시간 상관 모듈에서 생성된 보정 신호 및 반사 신호를 토대로 시간 지연값을 도출하여 상기 시간 지연값 및 전파 속도를 토대로 보정 위치와 취득 위치 간의 거리를 도출하여 검사 대상 케이블의 이상 발생 위치 및 이상 상태를 도출하는 연산 모듈을 포함하는 것을 특징으로 하는 케이블 고장 진단 시스템.
- 제3항에 있어서, 상기 시간 상관 모듈은,상기 인가 신호 및 반사 신호를 토대로 기 정해진 상관 함수값이 최대 극대값을 가지는 보정 위치를 도출하는 제1 시간 상관기와,상기 보정 위치에서의 인가 신호가 제거된 반사 신호를 토대로 보정 신호를 생성하는 제2 시간 상관기를 포함하는 것을 특징으로 하는 케이블 고장 진단 시스템.
- 제4항에 있어서, 상기 제1 시간 상관기는,상기 인가 신호 발생부로부터 발생된 가우시안 포락선 선형 처프 신호를 토대로 생성된 인가 신호와 반사 신호에 대한 시간 영역의 상관 함수값을 연산하고,연산된 상관 함수값이 최대 극대값을 가지는 보정 위치를 도출하도록 구비되는 것을 특징으로 하는 케이블 고장 진단 시스템.
- 제4항에 있어서, 제2 시간 상관기는,상기 보정 위치에서의 인가 신호와 반사 신호의 차를 토대로 상기 보정 위치에서의 인가 신호가 제거된 반사 신호인 보정 신호를 생성하도록 구비되는 것을 특징으로 하는 케이블 고장 진단 시스템.
- 제4항에 있어서, 상기 연산 모듈은,상기 보정 신호와 반사 신호, 및 보정 신호 및 반사 신호에 대한 시간 영역의 상관 함수, 및 전파 속도를 토대로 케이블 고장 발생 위치 및 고장 진단 결과를 도출하도록 구비되는 것을 특징으로 하는 케이블 고장 진단 시스템.
- 고장 위치와 인가 위치의 근접으로 인해 인가 신호 및 반사 신호가 중첩되거나 고장 위치와 인가 위치의 원 거리로 인해 반사 신호의 세기가 미약하여 기 정해진 고장 진단 범위를 벗어나는 경우 다수의 반사판 계측법 중 선택된 반사판 계측법을 통해 기 정해진 가우시안 포락선 선형 처프 신호가 반영된 인가 신호 및 취득되는 반사 신호에 대해 기 정의된 상관 함수로부터 최대 극대값을 가지는 보정 위치를 도출하고 상기 보정 위치의 인가 신호와 취득되는 반사 신호를 토대로 보정 신호를 생성하는 시간 상관 모듈과,상기 시간 상관 모듈에서 생성된 보정 신호 및 반사 신호를 토대로 시간 지연값을 도출하여 상기 시간 지연값 및 전파 속도를 토대로 케이블의 이상 발생 위치 및 이상 상태를 도출하는 연산 모듈을 포함하는 것을 특징으로 하는 케이블 고장 진단 시스템의 연산 장치.
- 제8항에 있어서, 상기 시간 상관 모듈은,상기 인가 신호 발생부로부터 발생된 인가 신호와 반사 신호에 대한 시간 영역의 상관 함수값을 도출하고 도출된 상관 함수값이 최대 극대값을 가지는 보정 위치를 도출하는 제1 시간 상관기와,상기 보정 위치에서의 인가 신호와 반사 신호의 차를 토대로 보정 위치에서 인가 신호가 제거된 반사 신호인 보정 신호를 생성하는 제2 시간 상관기를 포함하는 것을 특징으로 하는 케이블 고장 진단 시스템의 연산 장치.
- 제8항에 있어서, 상기 연산 모듈은상기 보정 신호와 반사 신호, 및 보정 신호 및 반사 신호에 대해 기 정의된 상관 함수, 및 전파 속도를 기반으로 고장 발생 위치 및 고장 진단 결과를 도출하도록 구비되는 것을 특징으로 하는 케이블 고장 진단 시스템의 연산 장치.
- 다수의 반사판 계측법 중 선택된 반사판 계측법을 통해 기 정해진 가우시안 포락선 선형 처프 신호가 반영된 인가 신호를 발생하여 검사 대상 케이블에 제공하는 인가 신호 발생 단계와,상기 검사 대상 케이블로부터 취득되는 반사 신호를 수신하는 반사 신호 수신 단계와,고장 위치와 인가 위치의 근접으로 인해 인가 신호 및 반사 신호가 중첩되거나 고장 위치와 인가 위치의 원 거리로 인해 반사 신호의 세기가 미약하여 기 정해진 고장 진단 범위를 벗어나는 경우 상기 인가 신호와 반사 신호에 대해 기 정해진 상관 함수값이 최대 극대값을 가지는 보정 위치를 도출하고 도출된 보정 위치의 인가 신호가 제거된 반사 신호인 보정 신호를 생성하고 생성된 보정 신호 및 반사 신호를 토대로 케이블 고장 위치 및 고장 유형을 추출하는 연산 단계를 포함하는 것을 특징으로 하는 케이블 고장 진단 방법.
- 제11항에 있어서, 상기 다수의 반사파 계측법은,STDR(Sequence Time Domain Reflectometry) 및 SSTDR(Spread Spectrum Time Domain Reflectometry) 중 하나 인 것을 특징으로 하는 케이블 고장 진단 방법.
- 제12항에 있어서, 상기 연산 단계는,상기 인가 신호 발생부로부터 발생된 처프 신호로부터 생성된 인가 신호와 반사 신호에 대한 시간 영역의 상관 함수값을 도출하고 도출된 상관 함수값이 최대 극대값을 가지는 보정 위치를 도출하고,상기 보정 위치에서의 인가 신호와 반사 신호의 차를 토대로 보정 위치에서 인가 신호가 제거된 반사 신호인 보정 신호를 생성하며,상기 보정 신호와 반사 신호, 상기 보정 신호 및 반사 신호에 대해 정의된 상관 함수값, 및 전파 속도를 기반으로 케이블 고장 발생 위치 및 고장 진단 결과를 도출하도록 구비되는 것을 특징으로 하는 케이블 고장 진단 방법.
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DE102017214996A1 (de) * | 2017-08-28 | 2019-02-28 | Siemens Aktiengesellschaft | Verfahren zum Bestimmen der Entfernung einer Reflexionsstelle auf einem elektrischen Leiter |
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