KR101743534B1 - Apparatus and method for monitoring electric state of cable of reflectometry system - Google Patents

Apparatus and method for monitoring electric state of cable of reflectometry system Download PDF

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Publication number
KR101743534B1
KR101743534B1 KR1020150064026A KR20150064026A KR101743534B1 KR 101743534 B1 KR101743534 B1 KR 101743534B1 KR 1020150064026 A KR1020150064026 A KR 1020150064026A KR 20150064026 A KR20150064026 A KR 20150064026A KR 101743534 B1 KR101743534 B1 KR 101743534B1
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South Korea
Prior art keywords
cable
electrical
signal
current
state information
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KR1020150064026A
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Korean (ko)
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KR20160131515A (en
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유재근
김택희
전정채
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한국 전기안전공사
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R31/02—
    • 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
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Locating Faults (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The present invention relates to an apparatus and method for monitoring the electrical state of a cable in a reflected wave measurement system and, in detecting a failure location and a failure type of a cable to be inspected based on an application signal supplied to the cable to be inspected and a reflection signal to be acquired, And monitoring the electrical state including the voltage and informing the related organizations through the communication network of the monitoring result of the electrical state and controlling the supply of power to the cable in the event of an electrical error, It is possible to monitor the electrical condition at all times and to protect the cable by cutting off the power supplied to the cable in the event of an electrical error of the monitoring result cable.

Description

TECHNICAL FIELD [0001] The present invention relates to a cable electrical state monitoring apparatus and method for a reflected wave measurement system,

The present invention relates to an apparatus and method for monitoring the electrical state of a cable in a reflected wave measurement system, and more particularly, to an apparatus and method for monitoring cable electrical conditions in a reflected wave measurement system, And more particularly, to a system and method for continuously monitoring the current and voltage of a cable.

In recent years, it has been known that the main cause of an airplane crash due to an abnormality of gas is the destruction of insulation of electrical wiring. In addition, there is a demand for a high stability in electric wiring such as a control system of a nuclear power plant, a space shuttle, a submarine, Reliability diagnosis and evaluation of electrical wiring is an important factor when the system is in an increasing trend.

Also, it is an important technical problem to diagnose and diagnose the abnormality of the accurate wire for the evaluation and verification of the quality of the wire produced in various types of wire production sites.

Therefore, the diagnosis of the presence of such a conductor and the position measurement technique, that is, the wiring diagnosis system, have been performed so far so that the reflectometry method (Reflectometry) for diagnosing the abnormality of the conductor by measuring a reflected signal after transmitting a certain signal to the conductor Respectively.

The reflected wave measurement method is performed only in the time domain or the frequency domain. The reflected wave measurement method measures a signal that is reflected and transmitted after transmitting a certain signal to the conductor, and detects defects such as open, short, discontinuity (TDR), standing wave reflectometer (SWR), and frequency domain reflected wave measurement (FDR) methods, which measure the characteristic impedance of a fault, presence or absence of a fault, Frequency Domain Reflectometry).

This reflection measurement method was able to monitor the presence or absence of faults such as open, short, and discontinuity of the conductor, the position of the defect, and the characteristic impedance measurement of the conductor.

Therefore, there is no system currently available for the cable fault diagnosis system using the conventional reflection wave method, which can monitor the current and voltage of the cable at all times and protect the cable in the event of overcurrent and overvoltage due to the monitoring result.

Accordingly, in the present invention, the electrical state including the current and the voltage of the cable is monitored at all times, the monitoring result is notified to the relevant authorities through the communication network, and the cable is protected by preventing the supply of the voltage to the cable in the event of an electrical error And the like.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of detecting a failure location and a failure type of a cable to be inspected based on an application signal supplied to the cable to be inspected and a reflected signal to be acquired, A cable electrical status monitoring device of a reflected wave measurement system that monitors an electrical condition including current and voltage, informs related organizations of the result of monitoring of electrical status through a communication network, and interrupts supply of power to the cable in the event of an electrical error; The cable state can be constantly checked by the reflected wave measuring device.

According to an aspect of the present invention, there is provided an apparatus for monitoring a cable electrical condition of a reflected wave measurement system,

An application signal generator for generating an application signal reflecting the predetermined Gaussian envelope linear chirp signal and transmitting the application signal to the cable under test; a reflection signal receiver for receiving a reflection signal acquired from the cable to be inspected; And a signal analyzer for deriving an abnormality occurrence position and an abnormal state of the inspection target cable through analysis of a time domain,

Further comprising an electrical state information collecting unit for collecting electrical state information including a current and a voltage flowing through the cable to be inspected and transmitting the electrical state information to the signal analyzing unit,

delete

Wherein the signal analyzer comprises:

The electrical state information of the cable supplied from the electrical state information collecting unit is compared with each of the previously stored thresholds to determine an electrical error of the cable and a control signal is generated to interrupt the power supply of the cable when an electrical error occurs .

Preferably, the electrical state information collecting unit,

A current sensor for measuring the current flowing in the cable, a voltage sensor for measuring the voltage, and a ZCT current sensor for measuring the leakage current,

And a plurality of analog-to-digital converters converting the measured values of the respective sensors into digital signals to generate electrical state information including current state information and voltage state information.

Preferably,

An over-voltage of the cable, a low current, an over-current, a leakage current, and a low voltage.

And a blocking unit for interrupting the supply of power to the cable by receiving a control signal generated according to a cable electrical error determination result of the signal analyzing unit.

delete

Preferably,

And a relay which is switched to a turn-off state when an electrical error of the cable is generated and cuts off power supply to the inspection object cable.

And a communication unit for transmitting the electrical status information of the cable of the signal analyzing unit and the electrical error determination result to an engine server located at a remote site.

delete

According to an aspect of the present invention, there is provided a method for monitoring a cable electrical condition of a reflected wave measurement system,

A first step of analyzing a failure location and a failure type of the cable by analyzing the applied signal propagated on the cable to be inspected and the obtained reflected signal using a predetermined signal analysis technique;

And a second step of monitoring the electrical state of the cable to be inspected and interrupting the power supply of the cable to be inspected in the event of an electrical error as a result of monitoring of the electrical state.

Preferably, in the second step,

An electric state collecting step of collecting electric state information including a current and a voltage and a leakage current of a cable supplied from a current sensor and a voltage sensor provided at predetermined positions of the cable to be inspected and a leakage current sensor,

A signal analysis step of determining an electrical error of the cable by comparing the electrical state information with each of the previously stored thresholds and generating a control signal for interrupting the power supply of the cable when determining an electrical error of the cable,

And disconnecting the power supply of the cable according to the control signal.

Preferably, the electrical state information comprises:

And is a measured value of current, voltage, and leakage current of the cable.

Preferably,

Current, over-voltage, low-voltage, and leakage current of the cable.

Preferably, in the second step,

And a communication step of transmitting the information on the electrical state and the determination result of the electrical error to an institution server located at a remote site.

According to the present invention, in detecting the failure position and the failure type of the cable to be inspected based on the application signal supplied to the cable to be inspected and the reflection signal to be acquired, the electrical state including the current and voltage of the cable is monitored, The monitoring result is communicated to the related organizations through the communication network and at the same time the power supply to the cable is controlled in the event of an electrical error, the cable electrical state can be constantly monitored by the reflected wave measurement system in the uninterrupted state, In case of an electrical error, it is possible to protect the cable by cutting off the power supplied to the cable.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further understand the technical idea of the invention. And should not be construed as limiting.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the configuration of an electrical condition monitoring apparatus for a cable of a reflected wave measurement system according to an embodiment of the present invention; FIG.
FIG. 2 is a flowchart illustrating a cable electrical condition monitoring process of a reflected wave measurement system according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and method for monitoring a cable electrical condition of a reflected wave measurement system according to the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a block diagram of a cable monitoring apparatus of a reflected wave measurement system according to an embodiment of the present invention. Referring to FIG. 1, a cable electric state monitoring apparatus of a reflected wave measurement system according to an embodiment of the present invention will be described.

That is, as shown in FIG. 1, the apparatus for monitoring the electrical state of the cable of the reflected wave measurement system according to the embodiment of the present invention detects the failure position of the cable to be inspected and the position of the cable under test based on the application signal supplied to the cable to be inspected, The failure type is detected, the electric current status and the voltage of the cable are monitored to monitor the electric status information, and the monitoring result is transmitted to the related organization through the communication network by cutting off the power supply of the cable when an electrical error of the cable occurs, The apparatus includes an application signal generating unit 100, a reflection signal receiving unit 200, a signal analyzing unit 300, an electrical state information collecting unit 400, a cutoff unit 500, and a communication unit 600.

The application signal generating unit 100 of the present embodiment of the present invention generates an application signal whose frequency increases linearly with time according to a predetermined gau time envelope linear chuck signal, And propagates through the cable to be inspected.

The reflection signal receiving unit 200 is provided to acquire a part of the application signal propagated through the inspection target cable. In this case, when the problematic portion of the cable to be inspected exists, the magnitude of the applied signal is attenuated and the phase is deformed according to the cable characteristics. At this time, the attenuation degree of the applied signal magnitude and the degree of deformation of the phase depend on the frequency and distance of the signal. Which is reflected in the propagation constant of the cable.

In addition, the signal analyzer 300 analyzes the application signal and the reflection signal through a predetermined signal analysis technique to detect a failure location and a failure type of the cable.

Here, the signal analysis technique may be variously applied to TDR (Time Domain Reflectometry), FTDR (Frequency Domain Reflectometry), TFDR (Time Frequency Domain Reflectometry), STDR (Sequence Time Domain Reflectometry) and SSTDR (Spread Spectrum Time Domain Reflectometry) However, in the embodiment of the present invention, it is preferable that it is made of TDR (Time Domain Reflectometry).

That is, a reflection phenomenon occurs when a characteristic impedance of a cable is changed, and an opposite phase reflection phenomenon occurs at an impedance point larger than the characteristic impedance of the cable at a small impedance point of the same phase.

The signal analyzing unit 300 using the signal analysis technique of the TDR determines whether or not the difference between the applied position of the applied signal and the acquired position of the reflected signal is equal to or greater than a predetermined threshold value on the basis of the time delay value and the predetermined propagation velocity, The distance of the point is detected.

The process of detecting the abnormal point distance in the signal analyzer 300 using the signal analysis technique of the TDR is the same as the general procedure of deriving the fault location based on the time delay value and the propagation velocity using general reflection wave measurement similar.

The cable electrical condition monitoring apparatus of the present invention may further include an electrical condition information collecting unit 400 for measuring the voltage and current of the cable under test and transmitting the measured voltage and current to the signal analyzing unit 300 do.

The electrical state information collecting unit 400 is provided with various current sensors such as a current measuring sensor for measuring a current flowing through a cable under test and a ZCT (Zero Current Transformer) sensor for measuring a leakage current, And an analog-to-digital converter for converting the measurement value including the current and the leakage current of the cable into a digital signal to generate current state information and then transmitting the current state information to the signal analysis unit 300.

The cable condition information collecting unit 400 further includes a voltage sensor for monitoring a voltage state of the cable to be inspected and converts the voltage measurement value of the cable measured from the voltage sensor into a digital signal to generate voltage state information And an analog-to-digital converter for transmitting the voltage state information to the signal analyzer 300.

The signal analyzer 300 analyzes the overcurrent overvoltage, the low current, the low voltage, and the leakage current of the cable under test based on the current status information and the voltage status information of the cable to be inspected collected from the electrical status information collector 400 And generates a control signal for interrupting the supply of power to the inspection object cable in accordance with the determination result of the electrical error of the cable. At this time, the cable electrical error of the signal analyzer 300 is determined by comparing the measured values of the voltage, the current, and the leakage current of the cable under test with the pre-stored threshold values.

The control signal of the signal analysis unit 300 is transmitted to the blocking unit 500.

In the cable monitoring apparatus of the present invention, the power supply to the cable is blocked by interrupting the supply of power to the cable to be inspected according to a control signal of the signal analyzer 300 The blocking unit 500 may be provided with various switching devices such as a relay for blocking the flow of current supplied from the outside according to the control signal.

The cable monitoring apparatus of the reflected wave measurement system according to the embodiment of the present invention further includes a communication unit 600 for transmitting the voltage and current status information of the cable of the signal analyzing unit 300 to the engine server through the communication network .

Here, the communication unit 600 is a communication network for connecting between the signal analysis unit 300 and a server of a related organization (not shown), and may be connected to various communication networks such as Ethernet, CDMA, WiFi, and IP But is not limited to, and is not limited to a specific type, as long as it is a wired or wireless communication network that enables a communication network.

In the embodiment of the present invention, for convenience of explanation, it is described that the signal analyzing unit 300 determines the electrical error of the cable to be inspected. However, the current state information of the cable state state collecting unit 400 and / The voltage status information is transmitted to the concerned organization through the communication unit 600, and an electrical error of the cable to be inspected is determined in the related organization, a control signal of the blocking unit 500 generated according to the determination result is generated, The control unit 500 may be provided to transmit the control signal to the signal analyzer 300 through the communication unit 600. [

It will be appreciated that the electrical errors of the cable under test, the location of the cable failure and the history of the failure type are stored and managed in a memory provided in a predetermined area of the signal analyzer or in a separate memory.

That is, in detecting the failure location and the failure type of the cable under test based on the application signal supplied to the cable to be inspected and the reflection signal to be acquired, the electrical state including the current and voltage of the cable is monitored, It is possible to constantly monitor the electric state of the cable by the reflected wave measurement system in the uninterrupted state as the electric power is supplied to the cable in the event of an electrical error, It is possible to protect the cable by cutting off the power supplied to the cable.

On the other hand, in detecting the failure location and the failure type of the cable to be inspected based on the application signal supplied to the cable to be inspected and the reflection signal to be acquired, the electrical state including the current and voltage of the cable is monitored, A series of procedures for notifying the related authorities through the communication network and for interrupting power supply to the cable in the event of an electrical error will be described with reference to FIG.

FIG. 2 is a flowchart illustrating an operation process of the cable electrical condition monitoring apparatus of the reflected wave measurement system shown in FIG. 1, and FIG. 2 illustrates a cable electrical condition detection process of the reflected wave measurement system according to another embodiment of the present invention .

First, the signal analyzing unit 300 analyzes a failure location and a failure type of the cable to be inspected by analyzing the application signal propagated through the cable under test and the reflection signal acquired from the cable through a predetermined signal analysis technique (step S1 ).

The electrical state information collecting unit 400 collects electrical current, voltage, and leakage current values supplied from the respective current sensors, voltage sensors, and ZCT current sensors under the control of the signal analyzer 300 And converts the collected measurement values into digital signals to generate electrical state information including current state information and voltage state information, and transmits the generated electrical state information to the signal analysis unit 300 (steps S2 and S3).

Then, the signal analyzer 300 determines an electrical error of the cable by comparing each measured value of the electrical state information of the cable to be inspected with each previously stored threshold value (step S4).

The signal analyzer 300 generates a control signal for interrupting power supply to the cable when an electrical error of the cable under test is determined, and the generated control signal is transmitted to the interceptor 500 (step S5) .

The blocking unit 500 switches the switching device to a turn-off state according to a control signal of the signal analyzing unit 300 to block power supply to the cable (step S6).

Meanwhile, the signal analyzing unit 300 transmits at least one of the electrical state information of the cable and the electrical error determination result to the related institute located at a remote site through the communication unit 600 (step S7).

According to the embodiment of the present invention, in detecting the failure location and the failure type of the cable to be inspected based on the application signal supplied to the cable to be inspected and the reflection signal to be acquired, the electrical state including the current and voltage of the cable is monitored It is possible to always monitor the electric state of the cable by the reflected wave measurement system in the uninterrupted state by monitoring the electric state monitoring result through the communication network to the related organizations and controlling the power supply to the cable in case of the occurrence of the electric error, As a result, when an electrical error occurs in the cable, the power supplied to the cable is cut off, thereby protecting the cable.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in the form of a program form which may be performed via a variety of computing means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and configured for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media 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. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

In detecting the failure location and the failure type of the cable under test based on the application signal supplied to the cable to be inspected and the reflection signal to be acquired, the electrical state including the current and voltage of the cable is monitored, It is possible to always monitor the electric state of the cable by the reflection wave measuring system in the uninterrupted state and to monitor the electric state of the cable at the time of the occurrence of an electrical error of the cable, Which can protect the cable by shutting off the power supplied to the cable, and can further improve the efficiency and reliability of the operation and monitoring of the cable electrical condition monitoring apparatus and method of the reflected wave measurement system, Exploration, material surface inspection, radar / sonar, network network Wire, optical cable, so that the degree diagnosis, remote sensing, there is sufficient potential for commercial or marketing of a wiring system such as a fluid pipe leakage diagnosis, as well as level measurement can be carried out explicitly in reality the invention there is industrial applicability.

Claims (11)

An application signal generator for generating an application signal reflecting the predetermined Gaussian envelope linear chirp signal and transmitting the application signal to a cable to be inspected, a reflection signal receiver for receiving a reflection signal acquired from the cable to be inspected , And a signal analyzer for deriving an abnormality occurrence position and an abnormal state of the inspection target cable through analysis of a time domain,
Further comprising an electrical state information collecting unit for collecting electrical state information including a current and a voltage flowing through the cable to be inspected and transmitting the electrical state information to the signal analyzing unit,
Wherein the signal analyzer comprises:
The electrical state information of the cable supplied from the electrical state information collecting unit is compared with each of the previously stored thresholds to determine an electrical error of the cable and a control signal is generated to interrupt the power supply of the cable when an electrical error occurs Respectively,
The electrical state information collecting unit,
A current sensor for measuring the current flowing in the cable, a voltage sensor for measuring the voltage, and a ZCT current sensor for measuring the leakage current,
And a plurality of analog-to-digital converters converting the measured values of the respective sensors into digital signals to generate electrical state information including current state information and voltage state information. delete 2. The method of claim 1,
Wherein the cable is an overvoltage, a low current, an overcurrent, a leakage current, and a low voltage of the cable. delete delete 4. The cable electrical condition monitoring apparatus of claim 3, further comprising a communication unit for transmitting information on the electrical state of the cable of the signal analyzing unit and a determination result of an electrical error to an engine server located at a remote location. A first step of analyzing the applied signal propagated to the cable under test and the obtained reflected signal using a predetermined signal analysis technique to detect a failure location and a failure type of the cable;
And a second step of monitoring the electrical state of the cable to be inspected and interrupting the power supply of the cable to be inspected in the event of an electrical error as a result of the electrical monitoring,
In the second process,
An electric state collecting step of collecting electric state information including a current and a voltage and a leakage current of a cable supplied from a current sensor and a voltage sensor provided at predetermined positions of the cable to be inspected and a leakage current sensor,
A signal analysis step of determining an electrical error of the cable by comparing the electrical state information with each of the previously stored thresholds and generating a control signal for interrupting the power supply of the cable when determining an electrical error of the cable,
And interrupting power supply of the cable in accordance with the control signal. delete 8. The method of claim 7,
Wherein the measured value is a measured value of current, voltage, and leakage current of the cable. 10. The method of claim 9,
Wherein the cable is an overcurrent, a low current, an overvoltage, a low voltage, and a leakage current of the cable. 11. The method of claim 10,
Further comprising a communication step of transmitting the information on the electrical state and the determination result of the electrical error to an institution server located at a remote site.
KR1020150064026A 2015-05-07 2015-05-07 Apparatus and method for monitoring electric state of cable of reflectometry system KR101743534B1 (en)

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KR101153296B1 (en) * 2011-01-24 2012-07-13 주식회사 뉴피에스 For winding up with the direct current power having a royal mausoleum for winding up with a direct current power supply or earth of a direct current power track and leakage electric current

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101153296B1 (en) * 2011-01-24 2012-07-13 주식회사 뉴피에스 For winding up with the direct current power having a royal mausoleum for winding up with a direct current power supply or earth of a direct current power track and leakage electric current

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