KR100971991B1 - Method, system and discrimination method for detecting fault point of submarine cable - Google Patents

Abstract

The present invention relates to a method, a system, and a method for effectively detecting the location of a fault point when a high resistance ground fault occurs in a submarine cable installed in a subsea section, and to detect discharge noise generated during a high resistance ground fault of a subsea cable. Analyze the location of the manned submersible for the manned submersible which approaches the point of failure of the submarine cable by analyzing the point detecting device and the point detecting device which analyzes and detects the point of failure. A system is provided that includes a location tracking device that tracks the exact location of the manned submersible and failure point via data.

According to the present invention, by using the DC Impulse Burning method, by accurately and quickly tracking the position of the point of failure of the submarine cable at the time of a high resistance ground fault, it is possible to shorten the fault recovery period compared to the conventional method, thereby reducing the cost of economic loss. The effect of remarkably reducing this is achieved.

Discharge Noise, Submarine Cable, Fault Point, USBL, DGPS

Description

METHOD, SYSTEM AND DISCRIMINATION METHOD FOR DETECTING FAULT POINT OF SUBMARINE CABLE}

The present invention relates to a method, a system, and a method for detecting a failure point of a submarine cable, and more particularly, to effectively detect the location of a failure point when a high resistance ground fault occurs for a submarine cable installed in a subsea section. It relates to a method, a system and a determination method.

Currently, the submarine cable is installed under the deep sea, and the submarine cable is divided into the rough position detection method and the detailed position detection method by finding the location of the fault point.

The approximate location detection method of the submarine cable installed in the subsea section consists of a measurement circuit in the submarine cable terminal, using the TDR (Time Domain Reflector) using the pulse and the Murray loop method using the Wheaten bridge principle. By measuring and calculating this, it is possible to roughly detect the location of the point of failure of the submarine cable. The calculated location of the fault point may have an error range of about 1%, but in case of a long submarine cable section or a subsea section, the error range of the fault point may be larger due to various obstacles. It can be time-consuming to locate and repair the point of failure of the submarine cable.

On the other hand, the detailed position detection method of the submarine cable installed in the subsea section performs the detailed position detection at the failure site to find the point of failure of the submarine cable and determine the cutting position of the submarine cable necessary for the repair of the submarine. Normally, the location of a failure point can be detected in detail by using an electric method based on a magnetic field detection method using a confirmation method and a difference in leakage current before and after a failure point.

Visual inspection is possible in the exposed part where the watch is secured in case of external damage due to anchorage or lumber drop due to anchoring in the submarine cable, but buried, in case the watch is not secured, or in the case of deep sea below 30m Has limitations that you can hardly expect.

  The magnetic field detection method is a detailed position detection method that is used most widely in the world among the existing methods that are electrically accessible, and is used in the event of a ground fault or breakage of the submarine cable. However, when the failure current does not return to seawater at the time of failure of the submarine cable, there is a problem that the location of the failure point cannot be detected. In other words, the conventional magnetic field detection method has a problem that the fault current generated from the fault point of the submarine cable must be detected by returning to the seawater, and in other cases, the fault point cannot be detected.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems as described above. In the case of a failure in which a failure current does not return to seawater at the time of a failure of a submarine cable, for example, a switching surge in the case of a long distance submarine cable, etc. In order to protect the PE sheath layer, the metal sheath is designed to be multi-grounded and installed in the field. In this case, the failure point may not be located depending on the failure type. In other words, it is easy to detect when the fault is severe and the fault current returns to seawater, but it is easy to detect, but in the case of a high resistance ground fault with a small fault point such as an internal fault caused by secular variation, the fault current Without returning through the seawater and returning through the metal sheath ground point multi-grounded through the metal sheath, there is no change in leakage current before and after the failure point, and the leakage current at the multiple grounded metal sheath ground point is not the fault point. Changes have occurred and there are factors that can be mistaken for failure points.

As described above, for example, the subsea uses the discharge noise detection method (Burning by DC Impulse) in the event of a high resistance ground fault in which the fault current does not return through the seawater but through the multiple grounded metal sheaths. An object of the present invention is to provide a method, a system, and a method of detecting a failure point of a submarine cable by detecting the magnitude of discharge noise generated at a failure point of a cable.

In addition, a system that detects a failure point of the submarine cable together with a system for accurately determining the position of the manned submersible and the manned sleep correction that is induced to enter the failure point position of the submarine cable more accurately, It is an object of the present invention to provide a method for detecting the location of a failure point.

In order to achieve the object of the present invention as described above, and to perform the characteristic functions of the present invention described below, the characteristic configuration of the present invention is as follows.

According to one aspect of the present invention, a system for detecting a failure point of a submarine cable, a failure point detection device for detecting a failure point by detecting and analyzing the discharge noise generated when high resistance ground fault of the submarine cable and the failure point Positioning device that tracks the location of the manned submersible for the manned submersible approaching the point of failure of the submarine cable by attaching a detection device, and then tracks the exact position of the point of failure through the expressed data. Provided is a system comprising a.

The failure point detection device, the discharge noise detection sensor for detecting the discharge noise generated in the submarine cable, the signal separation for detecting and separating the signal of the discharge noise detected by the discharge noise detection sensor to determine whether the discharge signal And a filter, a signal processing device for analyzing the magnitude and pattern of the separated discharge signal, and an output device for outputting the signaled discharge signal.

The location tracking device, the USBL for tracking the location of the manned submersible in communication with the USBL of the manned submersible, the DGPS receiving device for receiving the position data of the mother ship about the position of the mother ship mounted the location tracking device from the satellite, Analysis of expressing the correct position of the manned submersible and submarine cable as a result by combining the data generated by the motion sensor and the USBL, DGPS receiver and the motion sensor respectively correcting the error of the bus with respect to the second position data of the bus. May comprise a processing system.

According to another aspect of the present invention, there is provided a method for detecting a failure point of a submarine cable, wherein (a) the failure point detection device detects and analyzes the discharge noise generated at the time of high resistance ground fault of the submarine cable. Detecting the position of the manned submersible for the manned submersible approaching the point of failure of the submarine cable by mounting the fault point detecting device, A method is provided that includes tracking the exact location of the failure point through the compiled data.

In addition, according to another aspect of the present invention, as a determination method for detecting the failure point of the submarine cable, (a) at the time of ground fault of the multi-ground submarine cable using a TDR (Time Domain Reflector) or Murray loop method Determining whether the position of the fault point can be detected and calculated, and (b) determining whether the position of the fault point can be detected in detail by using a magnetic field detection method in case of a ground fault of the multi-ground submarine cable. (C) detecting the location of the fault point in detail by using a discharge noise detection method (burning method by DC impulse) in case of ground fault of high resistance. And (d) detecting the location of the failure point by analyzing data of the fault current returning to the seawater when the ground fault of the low resistance results from the determination of the step (b). This method is provided.

According to the present invention, by using the DC Impulse Burning method, by accurately and quickly tracking the position of the point of failure of the submarine cable at the time of a high resistance ground fault, it is possible to shorten the fault recovery period compared to the conventional method, thereby reducing the cost of economic loss. The effect of remarkably reducing this is achieved.

DETAILED DESCRIPTION OF THE INVENTION The following detailed description of the invention refers to the accompanying drawings that show, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention, if properly described, is defined only by the appended claims, along with the full range of equivalents to which such claims are entitled. Like reference numerals in the drawings refer to the same or similar functions throughout the several aspects.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention.

1 is a view for illustratively explaining the cause of the ground fault of the submarine cable to be applied to the present invention.

As shown in Figure 1, whether or not to determine the failure due to ground fault of the submarine cable to be applied to the present invention on the basis of the fault point (Fault point) between the conductor formed inside the submarine cable and the lead sheath formed on the outside of the conductor By comparing the current values Im ₁ and Im _{2 according} to the magnitude of the detected magnetic field, it is possible to determine whether the submarine cable is broken. The criterion for the failure determination may be determined as a failure when Im ₂ is 50% or less of Im ₁ , that is, when Im ₂ ≤ Im ₁ × 0.5, it may be determined as a failure.

However, if the fault current returns very little through the seawater and most of it returns to the metal sheath, it may be difficult to determine the fault point because it becomes If ₂ 되어 0 and Im ₁ ≒ Im ₂ . Solve this way as follows. Injection current I _t = Is ₁ + Is ₂ + If ₂ , measurement current before failure point Im1 = It-Is ₁ , measurement current after failure point Im ₂ = Is _2, so Im ₁ = Is ₂ + If ₂ = Im ₂ + If ₂ can be. Here, If ₂ ≒ 0, Im ₁ ≒ Im ₂ becomes difficult to detect the point of failure of the submarine cable.

For this reason, the present invention uses a DC impulse burning method in order to reliably distinguish faults in which a fault current does not return through seawater but returns through multiple grounded metal sheaths, that is, in case of high resistance ground fault. An advantage is detected, which is a method of detecting a failure point by detecting the discharge noise by using the characteristic that the discharge noise is maximized at the failure point.

  2 is a view showing the configuration of the entire system for detecting the failure point of the submarine cable 500 according to an embodiment of the present invention, Figure 3 is a submarine cable 500 and the discharge noise sensor according to an embodiment of the present invention It is a figure which shows the relationship between 110.

As shown in Figures 2 and 3, the entire system for detecting a failure point of the submarine cable according to an embodiment of the present invention is a failure point detection device 100, the location tracking device 200, the manned submersible 300 The bus line 400 and the submarine cable 500 may be included.

The failure point detection device 100 (also referred to as 'discharge noise detection device') according to the present invention detects and analyzes the discharge noise generated when the high resistance ground fault of the submarine cable 500 occurs, thereby analyzing the failure point of the submarine cable 500. It can detect the function. To this end, the fault detection apparatus 100 of the present invention may be configured to include a discharge noise detection sensor 110, a signal separation filter 120, a signal processing device 130, and an output device 140 and the like. .

The discharge noise detection sensor 110 of the present invention serves to detect discharge noise generated when a ground fault of the submarine cable 500 occurs, and performs a function of detecting a discharge signal due to the detected discharge noise. Such a discharge noise detection sensor 110 is shown in more detail in Figure 3 through the discharge noise with the submarine cable 500 consisting of an outer (including Arm, 510), Lead Sheath 520, conductor 530. Can be.

When the signal of the discharge noise detected by the discharge noise detection sensor is detected, the signal separation filter 120 of the present invention performs a function of checking whether the discharge signal is a discharge signal and separating the signal. Since the discharge noise detection sensor 110 may detect not only the discharge signal due to the discharge noise but also other types of signals, the signal separation filter 120 may determine whether the discharge signal is a discharge signal to separate only the discharge signal.

The signal processing apparatus 130 of the present invention utilizes the discharge signal pattern, the magnitude, and the stored data in which the characteristics of the various discharge signals are stored. It will perform the function of analysis. At this time, the signal processing device 130 may be smoothly analyzed through high-speed signal processing by the CPU for the analysis of the size and pattern of the discharge signal smoothly. The output device 140 of the present invention performs a function of easily outputting the signal processed discharge signal for confirmation.

As described above, the failure point detection apparatus 100 according to an embodiment of the present invention uses the burning method by the DC impulse by the above-described components, so that the failure point of the submarine cable 500 can be accurately detected. Will be.

On the other hand, before describing the position tracking device 200 of the present invention, the first maneuvering submersible 300 will be described first.

Since the manned submersible 300 according to the present invention is a very difficult task to detect the degree of the discharge signal on the seabed, the submarine cable 500 by inducing the failure point detection device 100 by attaching the failure point detection device 100. It has the closest approach to the immediate top of. The manned submersible 300 may be provided with a USBL (Ultra Short Base Line, not shown) so that it can be traced from the mothership 400 by wirelessly communicating with the mothership 400 on the sea.

Position tracking device 200 (also referred to as 'submarine cable location tracking system') according to the present invention is attracted to the manned submersible 300 to approach the failure point of the submarine cable 500 by mounting the failure point detection device 100 After tracking the position of the submersible 300, the expression (標 표정), and performs the function of tracking the exact position of the failure point of the submarine cable 500 through the expression data. To this end, the position tracking device 200 according to the present invention includes a USBL 210, a DGPS receiver 220 connected with the satellite 230, a motion sensor 240, and the analysis processing system 250, etc. Can be configured. The position tracking device 200 may be mounted to the mother ship 400 and used to track the manned submersible 300.

Ultra Short Base Line (210) of the present invention communicates with the USBL of the manned submersible (300) serves to track the position of the manned submersible (300). In this case, when the USBL 210 tracks the manned submersible 300 moving on the sea floor, the USBL 210 actually tracks the relative position of the manned submersible 300, rather than absolutely estimating the exact position of the manned submersible 300. The location of the manned submersible 300 in range can be tracked to obtain its data.

Differential Global Positioning System (DGPS) receiving device 220 of the present invention serves to receive the position data on the position of the mother bus 400, which is attached to the position tracking device 200 from the satellite 230. The position data of the mother bus 400 received through the satellite 230 is slightly different from the position of the actual bus, and a motion sensor 240 is required to correct this.

The motion sensor 240 of the present invention performs a function of correcting an error of the bus bar 400 with respect to bus bar position data of the bus bus 400 obtained by the DGPS receiver 220.

The analysis processing system 250 of the present invention performs a function of comparing and comparing the data generated by the USBL 210, the DGPS receiver 220, and the motion sensor 240, respectively, and then expressing them. In this way, the exact location of the manned submersible 300 and the fault point can be known. For example, in the analysis processing system 250, the plane coordinate data of the result of tracking the manned submersible 300 from the USBL 210 is (α, β), and the data obtained from the DGPS receiver 220 is (X). ', Y'), and if the posture correction data obtained from the motion sensor 240 is (X, Y), the data can be converted into a plane coordinate system of the WGS84 ellipsoid which is used as the standard of the geodetic system. Will be. In general, data acquired from the USBL 210, the DGPS receiver 220, and the motion sensor 240 may be data generated by the UTM or TM coordinate system in the plane coordinate system of the WGS84 ellipsoid. Therefore, the position data acquired from the DGPS receiver 220 received from the satellite 230 is synthesized by combining the manned submersible tracking result and the posture correction data obtained from the motion sensor and converting them into a UTM or TM coordinate system into a planar coordinate system of the WGS84 ellipsoid. The final position of the manned submersible 300 and the failure point can be seen.

4 is a flowchart illustrating a method for determining a failure point of a submarine cable according to an embodiment of the present invention.

As shown in FIG. 4, a method for determining a failure point of a submarine cable according to an embodiment of the present invention is a method for detecting a failure point of a submarine cable 500, including steps (a) to (d). Can be done.

First, in step (a) 600, if a ground fault of a multi-ground submarine cable occurs, a location of a failure point with respect to the submarine cable 500 is approximately detected by using a time domain reflector (TDR) or Murray loop method. Determine whether it can be calculated. As a result of the determination, when the failure location cannot be detected by using a time domain reflector (TDR) or Murray loop method (610), a failure section of the submarine cable 500 may be searched by using a magnetic field detection method.

Next, in step (b), in step 620, when the approximate fault location is detected using a time domain reflector (TDR) or Murray loop method as a result of step (a), the detailed fault point location is determined by using the magnetic field detection method. Can be detected. As a result of the determination, for example, if it is determined that the fault current is a case of a high resistance ground fault returning through the metal sheath ground point multi-grounded through the metal sheath, perform step (c), for example, a low resistance ground fault where the fault current returns to the seawater. If it is determined that the failure is to perform step (d). In other words, step (c) may be performed if it is impossible to detect a failure point using the magnetic field detection method, and if possible, step (d) may be performed.

Next, in step (630), the position of the fault point of the submarine cable is determined in detail with respect to the ground fault of the high resistance which is difficult to detect the fault point by using the discharge noise detection method (the burning method by the DC impulse). Can be detected. The burning method by the DC impulse may be performed by the failure point detection device. The failure point detection device 100 has been described above with reference to FIGS. 2 and 3, and will be omitted herein.

Finally, (d) step (640) to determine the location of the failure point of the submarine cable 500 by analyzing only the failure data by the magnetic field detection method for the ground resistance failure of low resistance that is easily determined the detection of the failure point Also, (c) to determine the fault point position of the submarine cable 500 by analyzing only the fault data by the discharge noise detection method for the high resistance ground fault that is not easy to detect the fault point in step (630). It will be possible.

In detecting the location of the fault point in the case of ground fault of the multi-grounded submarine cable as described above, the fault point detection device 100 and the location tracking device 200 may be applied, but are not necessarily limited thereto. Even in the case of a break point of the submarine cable, a failure point detection device and a location tracking device may be sufficiently applied.

As described above, the technical configuration of the present invention described above will be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

1 is a view for illustratively explaining the cause of the ground fault of the submarine cable to be applied to the present invention.

 2 and a diagram showing the configuration of the entire system for detecting the failure point of the submarine cable 500 according to an embodiment of the present invention.

3 is a view showing the relationship between the submarine cable 500 and the discharge noise sensor 110 according to an embodiment of the present invention.

4 is a flowchart illustrating a method for determining a failure point of a submarine cable according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: fault detection device 110: discharge noise detection sensor

120: signal separation filter 130: signal processing device

140: output device 150: memory

200: location tracking device 210: USBL

220: DGPS receiver 230: satellite

240: motion sensor 250: analysis processing system

300: manned submersible 400: mothership

Claims (12)

As a system for detecting the point of failure of the submarine cable, Defect point detection device for detecting fault points by detecting and analyzing discharge noise generated during ground fault of submarine cable, and  The location of the manned submersible for the manned submersible approaching the point of failure of the submarine cable by installing the fault point detection device is tracked and determined, and then the exact position of the manned submersible and the fault point through the expressed data. Location tracking device System comprising a. The method of claim 1, The failure point detection device, Discharge noise detection sensor for detecting discharge noise generated in the submarine cable, A signal separation filter for detecting and separating a signal of discharge noise detected by the discharge noise detection sensor to determine whether the discharge signal is a discharge signal; A signal processing device for analyzing the magnitude and pattern of the separated discharge signal; An output device for outputting the signal processed discharge signal System comprising a. The method of claim 1, The manned submersible, System which is equipped with USBL to transmit one's position wirelessly The method of claim 3, The location tracking device, USBL for tracking the location of the manned submersible in communication with the USBL of the manned submersible, A DGPS receiver for receiving bus position data on a position of a bus, where the position tracking device is mounted, from a satellite; A motion sensor for correcting an error of the bus with respect to the position data of the bus; Analysis processing system that aggregates the data generated by the USBL, the DGPS receiver and the motion sensor, respectively, and expresses the exact position of the manned submersible and the failure point as a result. System comprising a. The method of claim 4, wherein The analysis processing system, And converting the data generated by the USBL, the DGPS receiver and the motion sensor into a planar coordinate system of the WGS84 ellipsoid to obtain the exact positions of the manned submersible and the failure point. As a method for detecting the point of failure of the submarine cable, (a) detecting the failure point by detecting and analyzing the discharge noise generated at the time of high resistance ground fault of the submarine cable;  (b) the position tracking device tracks the position of the manned submersible with respect to the manned submersible that accesses the point of failure of the submarine cable by mounting the fault point detecting device, and after the expression is determined, the maneuver through the expressed data. Track the exact location of submersibles and fault points How to include. The method of claim 6, In step (a), (a-1) the discharge noise detection sensor detects the discharge noise generated from the submarine cable, (a-2) the signal separation filter detecting a signal of the discharge noise detected by the discharge noise detection sensor, checking whether the signal is a discharge signal, and separating the signal; (a-3) analyzing the magnitude and pattern of the separated discharge signal by the signal processing apparatus, and (a-4) an output device outputting the signal processed discharge signal Method comprising a. The method of claim 6, In step (b), (b-1) the USBL communicating with the USBL of the manned submersible to track the position of the manned submersible; (b-2) receiving, by the DGPS receiving apparatus, position data on the position of the mother bus to which the positioning apparatus is installed, from the satellite; (b-3) the motion sensor correcting an error of the bus bar with respect to the second position data of the bus bar, and (b-4) the analysis processing system expressing the exact positions of the manned submersible and the failure point as a result by integrating the data generated by the USBL, the DGPS receiver and the motion sensor, respectively. Method comprising a. The method of claim 6, The high resistance ground fault A method of returning through a multiple grounded metal sheath ground point with a metal sheath as a path, wherein the magnitude of the discharge noise generated at the point of failure of the submarine cable is detected. As a discrimination method for detecting a failure point of a submarine cable, (a) determining whether or not the position of the fault point can be approximately detected and calculated by using a time domain reflector (TDR) or Murray loop method in case of a ground fault of a multi-ground submarine cable; (b) determining whether the location of the failure point can be detected in detail by using a magnetic field detection method in case of a ground fault of the multi-ground submarine cable; (c) detecting the location of the failure point in detail by using a discharge noise detection method (burning method by DC impulse) in case of ground fault of high resistance as a result of the determination in step (b); and (d) detecting the location of the failure point by analyzing the data of the fault current returning to the seawater when the ground fault of the low resistance results from the determination of step (b); How to include. The method of claim 10, The determination method, And determining the location of the failure point by analyzing discharge noise detection data in the case of high resistance ground fault as a result of the determination of step (c). The method of claim 10, The ground fault of the high resistance, When returning through the multiple grounded metal sheath ground point with a metal sheath as a path, the method characterized in that it is confirmed through data analysis by detecting the magnitude of the discharge noise generated at the submarine cable failure point.

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