KR101516403B1

KR101516403B1 - Apparatus and system for detecting cable failure place without interruption of electric power

Info

Publication number: KR101516403B1
Application number: KR1020140059677A
Authority: KR
Inventors: 김경수
Original assignee: 김경수
Priority date: 2014-05-19
Filing date: 2014-05-19
Publication date: 2015-05-04

Abstract

The present invention relates to an apparatus and a system for detecting a cable failure position capable of being applied to an uninterruptible state. The invention includes: a receiving signal generating part generating pulse signals inputted to a cable; a signal responding and transmission part transmitting the pulse signals, and receiving a reflected signal reflected from a failure position of the cable; a receiving signal processing part receiving the reflected signal from the failure position of the cable and processing the signal after removing noise; an uninterruptible signal inputting part inputting the pulse signals generated from the receiving single generating part to the cable without shutting down the electric power of the cable; and a failure position determination part determining the failure position by comparing the reflected signal reflected from the failure position of the cable to the received pulse signals inputted to the cable.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a system for detecting a cable fault in an uninterruptible state,

The present invention relates to a cable fault location detecting apparatus and system, and more particularly, to a cable fault location detecting apparatus and a cable fault location detecting apparatus that are capable of detecting a failure position of a cable by injecting a specific transmission signal into a cable in an uninterruptible state, To a cable fault location detecting apparatus and system applicable to the present invention.

Cable cabling systems are used in all fields ranging from military weapons systems such as air defense weapons systems and fighters to civilian industries such as buildings, factories, nuclear power, automobiles, ships, aircraft, have.

Defects (short circuit, contact failure, breakage, disconnection, etc.) of cable wiring system may cause important functions of military and civil electrical / electronic facilities to be lost or cause system malfunction, power outage, fire occurrence and information loss, It can cause enormous damage such as disruption and can threaten public safety.

According to the 2011 National Statistical of Electrical Disaster Statistics of the National Emergency Management Agency and the Korea Electrical Safety Corporation, the majority (20.6%) of electric fires are generated in wiring and wiring equipment, and 21.3% of electrical equipment accidents are related to cable wiring. The technology of detecting and locating cause and location more than cable early is playing an important role in preventing safety accident and reducing enormous damage. Therefore, it is necessary to detect the main cause of the cable fault and develop the technology for the location tracking technology, thereby preventing the accident.

In the prior art, there are a sound detection method for measuring an ultrasonic wave or an audible frequency region by discharging in case of a cable fault, an insulation resistance measurement method for measuring a leakage current by converting the insulation value by supplying DC power in a power failure state Various cable fault diagnosis and position detection techniques such as a partial discharge measurement method for measuring a discharge phenomenon of a defect are used.

However, since most of the prior art is subjected to a power interruption and the cable is disconnected and inspected, there is a possibility of interruption of facility operation, cable damage, etc., and an initial failure or an intermittent fault can not be detected, There is a problem that maintenance time and cost are required.

Korean Patent Publication No. 10-2002-0006972

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-described problems of the prior art by providing a method of inserting a specific transmission signal into a cable in an uninterrupted state, detecting and analyzing a signal reflected at a fault location, And to provide a system and a system for detecting a cable fault position applicable in an uninterruptible state for detecting a fault.

Another object of the present invention is to provide a method of manufacturing a contact failure, a short circuit, a short circuit, a short circuit ) And the like in order to identify the types and locations of faults.

According to an exemplary embodiment of the present invention, there is provided a transmission apparatus comprising: a transmission signal generator for generating a pulse signal injected into a cable; A signal transmitting and receiving unit transmitting the pulse signal and receiving a reflected signal reflected from the cable; A reception signal processing unit for receiving a reflected signal reflected from the high merits of the cable to remove noise and perform signal processing; An uninterruptible signal injection unit connected to the cable and injecting the pulse signal generated by the transmission signal generating unit into the cable without cutting off the power of the cable; And a fault location determination unit for comparing a pulse signal transmitted through the cable and a reflected signal reflected from the cable to a reflected wave signal to determine a fault location.

And a data communication unit for transmitting data including information on a failure location detected by the failure location determination unit to a monitoring device.

And the uninterruptible signal injection unit is an inductive coupler.

Wherein the transmission signal generator comprises: a waveform generator for generating a pulse signal; A digital-to-analog converter for converting the pulse signal generated by the waveform generator into an analog signal; And an output variable amplifier for amplifying the converted signal.

Wherein the received signal processing unit comprises: a noise rejection filter for removing noise included in the reflected signal; An amplifier for amplifying the output; And an analog-to-digital converter that converts the analog signal to a digital signal.

A failure direction determination unit for performing transmission signal injection and transmission and reception of a reflection signal at two points spaced apart from each other by a predetermined distance of the cable to compare the time difference of the reflection signal at two points with the sequence, .

The fault direction determination unit includes a delay line module inserted in the middle of the cable and providing a time difference of the reflected signal.

The fault direction determination unit includes a reflection time measurement module for measuring a time difference and a signal reception order between a first reflection signal received at a first signal transmission / reception point and a second reflection signal received at a second signal transmission / reception point; And a direction determination module for determining a direction of high strength of the cable based on the result of the reflection time measurement module.

And a switching module for selectively connecting an output terminal of the uninterruptible power supply signal injecting unit to a first signal transmission / reception point or a second signal transmission / reception point of the cable.

According to another aspect of the present invention, there is provided a cable fault location detecting apparatus applicable in an uninterrupted state; And a monitoring device for checking the state of the cable fault location detecting device and notifying the operator of the result received from the cable fault location detecting device.

According to the present invention, it is possible to detect a failure position of a cable by injecting a specific transmission signal into a cable in an uninterrupted state, and to detect and analyze a signal reflected at a failure position, It is possible to detect the initial failure or the intermittent failure, and the maintenance time and cost can be remarkably reduced.

Further, by inserting a delay line, injecting a transmission signal at two points, receiving a reflected signal, and detecting and analyzing it, even if a defect occurs at two or more points, it is possible to accurately detect the fault position as well as the direction.

1 is a schematic block diagram of a cable fault location detection system applicable in an uninterrupted state according to the present invention.
FIGS. 2A and 2B are conceptual diagrams for explaining a failure position detection principle of a cable fault position detecting apparatus. FIG.
3 is a schematic block diagram of an apparatus for detecting a cable fault position applicable in an uninterrupted state according to an embodiment of the present invention.
4 is a flowchart illustrating a process of detecting a cable fault position using the cable fault position detecting apparatus shown in FIG.
5A and 5B are a conceptual diagram and a signal diagram for explaining a case where the failure direction can not be detected.
6A and 6B are conceptual diagrams and signal diagrams for explaining a failure direction determination principle of a cable fault position detection apparatus applicable in an uninterrupted state according to another embodiment of the present invention.
7 is a schematic block diagram of an apparatus for detecting a cable fault position applicable in an uninterrupted state according to another embodiment of the present invention.
8 is a configuration diagram showing an example of the failure direction determination unit shown in FIG.
FIG. 9 is a block diagram showing another example of the failure direction determination unit shown in FIG.
10 is a flowchart illustrating a process of detecting a cable fault position using the cable fault position detecting apparatus shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a cable fault position detection system applicable in an uninterrupted state according to the present invention, FIGS. 2A and 2B are conceptual diagrams for explaining a failure position detection principle of a cable fault position detection apparatus, FIG. 2 is a schematic configuration diagram of a cable fault position detecting device applicable in an uninterrupted state according to an embodiment of the present invention; FIG.

Referring to FIG. 1, a cable fault location detection system applicable in an uninterrupted state according to the present invention includes a plurality of street lamps 100, a cable 200, a cable fault location detecting apparatus 300, and a monitoring apparatus 400 .

The cable 200 functions to supply electric power to the street lamp, and is embedded in the ground. In the case of this embodiment, a cable for supplying electric power to a street light is described as an example. However, the load is not limited to a street light, and various loads such as a military weapon system (missile weapon system, fighter, submarine, etc.) Power, aircraft, automobiles, ships, etc.).

The cable fault location detecting device 300 is connected to the cable 200 and detects the fault type and fault location of the cable in the uninterrupted state and transmits the detected result to the monitoring device.

The monitoring apparatus 400 checks the state of the cable fault position detecting apparatus and informs the operator of the result received from the cable fault position detecting apparatus.

2A and 2B, FIG. 2A illustrates a basic principle of a radar, and FIG. 2B illustrates a principle applied to the present invention.

In Fig. 2A, the distance R = (C x t) / 2 to the target can be obtained. R is the target distance, C is the speed of light (3 × 10 ⁸ m / s), and t is the round trip time.

Referring to FIG. 2B, it is noted that the medium is a cable, not an air, By injecting a specific signal, detecting the signal reflected by the strong point, and analyzing the reflection time, it is possible to detect the position of high advantage.

3, the cable fault location detecting apparatus 300 applicable in an uninterrupted state includes a transmission signal generating unit 310, a signal transmitting / receiving unit 320, a reception signal processing unit 330, an uninterruptible power supply signal injecting unit 340, A fault location determination unit 350, a data communication unit 360, and a control unit 390.

The transmission signal generator 310 generates various pulse signals to be injected into the cable. The transmission signal generating unit 310 includes a waveform generator for generating a pulse signal, a digital-analog converter for converting the pulse signal generated in the waveform generator into an analog signal, and an output variable amplifier for amplifying the converted signal.

The signal transmitting and receiving unit 320 transmits the pulse signal generated by the transmission signal generating unit 310 and receives the reflected signal reflected from the cable.

The received signal processing unit 330 receives the reflected signal reflected from the high merits of the cable and performs a function of removing noise and performing signal processing. The received signal processing unit 330 includes a noise removing filter for removing noise included in the reflected signal, an amplifier for amplifying the output, and an analog-to-digital converter for converting the analog signal into a digital signal.

The uninterruptible power supply unit 340 is connected to the cable 200 and performs a function of injecting the pulse signal generated by the transmission signal generation unit 310 into the cable in a state in which the power of the cable is not cut off, do. In the case of this embodiment, an inductive coupler is used as the uninterruptible signal injection unit.

The fault location determination unit 350 performs a function of determining a fault location by comparing the pulse signal transmitted through the cable and the reflected wave signal reflected from the cable. Measure the time difference between the transmitted pulse signal and the reflected signal and measure the distance to the high point.

The data communication unit 360 transmits data including information on the failure location detected by the failure location determination unit 350 to the monitoring device 400.

The controller 390 controls the operation of the transmission signal generator 310, the signal transmitter / receiver 320, the reception signal processor 330, the uninterruptible power supply signal injector 340, the failure location determiner 350, As shown in FIG.

4 is a flowchart illustrating a process of detecting a cable fault position using the cable fault position detecting apparatus shown in FIG.

Referring to FIG. 4, the transmission signal generator 310 generates a pulse signal as a transmission signal (S110).

A transmission signal is injected into the cable in an uninterrupted state using an inductive coupler (S120).

A process of receiving a reflected signal reflected from the merit of the cable is performed (S130).

The transmission signal and the reflection signal are compared with each other to determine a fault location of the cable (S140).

FIGS. 5A and 5B are conceptual diagrams and signal diagrams for explaining a case in which a failure direction can not be detected, and FIGS. 6A and 6B are diagrams for explaining a failure of a cable fault position detecting apparatus applicable in an uninterrupted state according to another embodiment of the present invention FIG. 7 is a schematic configuration diagram of a cable fault location detecting apparatus applicable in an uninterrupted state according to another embodiment of the present invention. FIG.

Referring to FIGS. 5A and 5B, when a cable defect occurs at the 'defect 1' point and the 'defect 2' point in the cable 200, a reflection signal as shown in FIG. 5B is received. When the reflection signal and the transmission signal are compared with each other, the distance of the corresponding point can be grasped, but the direction can not be judged.

In order to compensate for this, the embodiment shown in FIGS. 6A to 7 has been implemented so that it is possible to determine the high-merit distance as well as the high-merit direction.

6A and 6B, the cable fault position detecting apparatus 300 inserts a delay line in the middle of a cable, injects and transmits a transmission signal at a front point (1) of the delay line, and receives a first reflection signal And transmits the transmission signal at the rear point (2) of the delay line and transmits the transmission signal. When receiving the second reflection signal, the first reflection signal and the second reflection signal are obtained as shown in FIG. 6B.

When a failure occurs at a point of 'Defect 1' and 'Defect 2' in the cable, the first reflection signal according to 'Defect 1' is preferentially received at the front point (1) of the delay line, The second reflection signal corresponding to the 'defect 1' is received at the rear point (2) of FIG. Then, a second reflected signal according to 'defect 2' is received and a first reflected signal according to 'defect 2' is received at a rear point (2) of the delay line after a predetermined time has elapsed.

When the first reflection signal is received first and the second reflection signal is received after a predetermined time, it is determined that the reflection signal is in the direction close to the forward point (1) of the delay line, that is, the leftward direction of the forward point (1) . On the other hand, when the second reflection signal is first received and the first reflection signal is received after a predetermined time, the reflection signal is transmitted to a direction close to the rear point (2) of the delay line, that is, .

As described above, when the transmission and reception are performed at a position spaced apart by a predetermined distance between the cables, and the order of the two reflected signals is compared with the time difference, it is possible to determine the direction of the high advantage.

Referring to FIG. 7, according to the present embodiment, a cable fault location detecting apparatus 300 applicable in an uninterruptible state includes a transmission signal generator 310, a signal transmitter / receiver 320, a reception signal processor 330, A fault location determination unit 350, a data communication unit 360, a fault direction determination unit 370, and a control unit 390. [

The transmission signal generator 310 generates various pulse signals to be injected into the cable. The signal transmitting and receiving unit 320 transmits the pulse signal generated by the transmission signal generating unit 310 and receives the reflected signal reflected from the cable.

The received signal processing unit 330 receives the reflected signal reflected from the high merits of the cable and performs a function of removing noise and performing signal processing.

The uninterruptible power supply unit 340 is connected to the cable 200 and performs a function of injecting the pulse signal generated by the transmission signal generation unit 310 into the cable in a state in which the power of the cable is not cut off, do.

The failure direction determination unit 370 performs transmission signal injection and transmission and reception of a reflection signal at two points spaced apart from each other by a predetermined interval of the cable to compare the time difference of the reflection signal at two points with the order, As shown in FIG.

The control unit 390 includes a transmission signal generating unit 310, a signal transmitting and receiving unit 320, a receiving signal processing unit 330, an uninterruptible power supply signal injecting unit 340, a failure position determining unit 350, a data communication unit 360, And controls the operation of the direction determination unit 370.

FIG. 8 is a block diagram showing an example of the fault direction determination unit shown in FIG. 7, and FIG. 9 is a configuration diagram showing another example of the fault direction determination unit shown in FIG.

Referring to FIG. 8, the failure direction determination unit 370 according to the present embodiment includes a delay line module 371, a reflection time measurement module 372, and a direction determination module 373.

The delay line module 371 is inserted in the middle of the cable and injects a transmission signal at two points spaced apart from each other at a predetermined interval of the cable, that is, at a first signal transmission / reception point and a second signal transmission / reception point, To provide a time difference of < / RTI >

The reflection time measurement module 372 measures the time difference and the signal reception order between the first reflection signal received at the first signal transmission / reception point and the second reflection signal received at the second signal transmission / reception point, And performs functions to provide to the module.

The direction determination module 373 performs a function of determining the direction of the high strength of the cable based on the result of the reflection time measurement module 372. [

Referring to Fig. 9, the switching module 374 is further included in comparison with the above embodiment, and the remaining configuration is similar.

9 includes a delay line module 371, a reflection time measurement module 372, a direction determination module 373, and a switching module 374.

The switching module 374 uses one uninterruptible signal injection unit to inject a transmission signal into the first signal transmission / reception point, which is the front end of the delay line module 371, and the second signal transmission / reception point, And switches the connection between the line modules. That is, the switching module 374 selectively connects the output terminal of the uninterruptible power supply unit to the first signal transmission / reception point or the second signal transmission / reception point of the cable.

10 is a flowchart illustrating a process of detecting a cable fault position using the cable fault position detecting apparatus shown in FIG.

Referring to FIG. 10, a process of generating a first transmission signal and a second transmission signal is performed (S210).

The first and second transmission signals are transmitted to the first signal transmission / reception point and the second signal transmission / reception point of the cable spaced at predetermined intervals through the delay line (S220).

Receiving the first and second reflected signals at the first and second signal transmission / reception points, respectively (S230).

Then, a time difference between the first reflection signal and the second reflection signal is measured to determine the high-strength direction of the cable (S240).

It is to be understood that the present invention is not limited to the above-described embodiment, but may be modified in various ways within the scope of the appended claims, 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.

200: Cable 300: Cable fault position detection device
310: Transmission signal generator 320: Signal transmitter-
330: Received signal processing unit 340: Uninterrupted signal injection unit
350: Failure position determination unit 360: Data communication unit
370: Failure direction determination unit 390:
400: Monitoring device

Claims

A cable fault location detecting device applicable in an uninterrupted state,
A transmission signal generator for generating a pulse signal to be injected into the cable;
A signal transmitting and receiving unit transmitting the pulse signal and receiving a reflected signal reflected from the cable;
A reception signal processing unit for receiving a reflected signal reflected from the high merits of the cable to remove noise and perform signal processing;
An uninterruptible signal injection unit connected to the cable and injecting the pulse signal generated by the transmission signal generating unit into the cable without cutting off the power of the cable; And
And a fault location determination unit for comparing the pulse signal transmitted through the cable and the reflected signal reflected from the cable to obtain a fault location,
Wherein the transmission signal generator comprises:
A waveform generator for generating a pulse signal; A digital-to-analog converter for converting the pulse signal generated by the waveform generator into an analog signal; And an output variable amplifier for amplifying the converted signal. &Lt; Desc / Clms Page number 19 >

The method according to claim 1,
And a data communication unit for transmitting data including information on a failure location detected by the failure location determination unit to a monitoring device.

The method according to claim 1,
Wherein the uninterruptible signal injection unit is an inductive coupler.

delete

The method according to claim 1,
The reception signal processing unit,
A noise removing filter for removing noise included in the reflected signal;
An amplifier for amplifying the output; And
And an analog-to-digital converter for converting the analog signal into a digital signal.

The method according to claim 1,
A failure direction determination unit for performing transmission signal injection and transmission and reception of a reflection signal at two points spaced apart from each other by a predetermined distance of the cable to compare the time difference of the reflection signal at two points with the sequence, Wherein the cable fault location detecting device is operable in an uninterrupted state.

The method according to claim 6,
Wherein the failure direction determination unit
And a delay line module inserted in the middle of the cable and providing a time difference of the reflected signal.

8. The method of claim 7,
Wherein the failure direction determination unit
A reflection time measurement module for measuring a time difference between a first reflection signal received at a first signal transmission / reception point and a second reflection signal received at a second signal transmission / reception point and a signal reception order; And
And a direction determination module for determining a direction of the high strength of the cable based on the result of the reflection time measurement module.

9. The method of claim 8,
And a switching module for selectively connecting the output terminal of the uninterruptible power supply unit to the first signal transmission / reception point or the second signal transmission / reception point of the cable.

A cable fault location detecting device applicable in an uninterrupted state according to any one of claims 1, 2, 3, 5, 6, 7, 8 and 9; And
And a monitoring device for checking the state of the cable fault location detecting device and informing the operator of the result received from the cable fault location detecting device.