A system and method for accurately locating long-distance high-voltage submarine cable faults

Abstract

The invention discloses a long-distance high-voltage submarine cable fault accurate positioning system and method, comprising a submarine cable pulse detection receiver, a GPS locator, a data acquisition unit, a data processing unit, a submarine cable fault positioning unit, a computer, a submarine cable insulation tester for testing the insulation of a three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material, a DC high-voltage large current generator for pressurizing and raising the current of a fault point of the three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material, a TDR pulse time domain reflection tester for pre-positioning the fault point of the three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material, and a submarine cable pulse generator for pulse discharge of the fault point of the three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material. The system and method can accurately position the fault point of the submarine cable.

Description

Technical Field

[0001] The invention belongs to the field of power equipment diagnosis and testing, and relates to a long-distance high-voltage submarine cable fault accurate positioning system and method. Background Art

[0002] With the acceleration of the development of marine resources, the application of submarine high-voltage cables is becoming more and more extensive, especially in the fields of new energy development. However, due to the very complex service environment of submarine high-voltage cables, damage and breakage accidents caused by waves and currents, environmental corrosion, material aging, mechanical damage and human factors often occur, affecting offshore safety production and causing great economic losses.

[0003] Since it is difficult to repair submarine high-voltage cables at sea, it is necessary to accurately locate the fault location of the submarine high-voltage cables in order to effectively and quickly salvage the damaged submarine cables, repair the damaged parts, and minimize economic losses. At present, the main means of monitoring submarine high-voltage cable faults include measuring temperature changes through temperature measuring optical fibers and time domain reflection methods. In previous failure cases, the accuracy of temperature measuring optical fibers was very low because the impact of submarine cable failures on temperature was relatively small. Time domain reflection methods could only measure theoretical positions. Since the route of submarine cables changes with ocean currents, the results were also quite different from the actual location of the fault point.

[0004] In the past, the precise positioning of submarine cable fault points, due to external signal interference and other factors, the positioning of the fault points using only the transmission and reception of electromagnetic signals resulted in large errors and took a long time, affecting the progress of the emergency repair work. Summary of the invention

[0005] The purpose of the present invention is to overcome the disadvantages of the prior art and provide a long-distance high-voltage submarine cable fault accurate positioning system and method, which can accurately locate the submarine cable fault point.

[0006] To achieve the above-mentioned purpose, the long-distance high-voltage submarine cable fault accurate positioning system of the present invention comprises a submarine cable pulse detection receiver, a GPS locator, a data acquisition unit, a data processing unit, a submarine cable fault positioning unit, a computer, a submarine cable insulation tester for testing the insulation of a three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material, a DC high-voltage large current generator for pressurizing and increasing the current at the fault point of the three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material, a TDR pulse time domain reflection tester for pre-positioning the fault point of the three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material, and a submarine cable pulse generator for pulse discharge at the fault point of the three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material;

[0007] The submarine cable pulse detection receiver and the GPS locator are connected to the data acquisition unit, the output end of the data acquisition unit is connected to the data processing unit, the output end of the data processing unit is connected to the submarine cable fault locating unit, and the computer is connected to the data processing unit and the submarine cable fault locating unit.

[0008] The submarine cable pulse detection receiver and the GPS locator are connected to the data acquisition unit through an underwater data transmission line.

[0009] The computer is connected with the data processing unit and the submarine cable fault locating unit through a data connection line.

[0010] It also includes a diving detection rod and a diving depth sounder, which are connected to the data acquisition unit via an underwater data transmission line.

[0011] It also includes an underwater high-definition camera, which is connected to the data acquisition unit via an underwater data transmission line.

[0012] It also includes a data storage unit; the data acquisition unit and the computer are connected with the data storage unit.

[0013] The method for accurately locating a long-distance high-voltage submarine cable fault according to the present invention comprises the following steps:

[0014] 1) Performing insulation test on a three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material using a submarine cable insulation tester. When the measured insulation test value is less than a preset value, proceed to step 3); when the measured insulation test value is greater than the preset value, proceed to step 2);

[0015] 2) Using a DC high-voltage and high-current generator to pressurize and increase the current of a three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material, ablate the fault point, and stop pressurizing when the voltage changes from increasing to decreasing. Then, use a submarine cable insulation tester to perform an insulation test on the three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material, so that the measured insulation test value is less than a preset value, and then go to step 3);

[0016] 3) Use a TDR pulse time domain reflectometer to pre-position the fault point of a three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material to obtain the length of the submarine cable from the fault point to the test point;

[0017] 4) Use a GPS locator to locate the test point and obtain the location information of the test point;

[0018] 5) Use a submarine cable pulse generator to perform pulse discharge on the fault point of a three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material;

[0019] 6) Use the submarine cable pulse detection receiver to locate the fault point of the cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable.

[0020] The default value is 10Ω.

[0021] The present invention has the following beneficial effects:

[0022] The long-distance high-voltage submarine cable fault precise positioning system and method described in the present invention, when in specific operation, based on the precise positioning of the traditional submarine cable fault electromagnetic signal, uses a TDR pulse time domain reflection tester to perform a pre-positioning test on the fault point, and then uses a submarine cable pulse generator and a submarine cable pulse detection receiver to locate the fault point, so as to be able to quickly and accurately locate the submarine cable fault point, effectively improve the accuracy of precise positioning, shorten the time for finding the fault point, and reduce the economic losses caused by the submarine cable fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 A progress chart for the towing vessel;

[0025] Figure 3 It is a test schematic diagram of the diving depth sounder 8;

[0026] Figure 4 It is a flow chart of the present invention.

[0027] Among them, 1 is a submarine cable insulation tester, 2 is a DC high-voltage and high-current generator, 3 is a TDR pulse time domain reflectometer, 4 is a submarine cable pulse generator, 5 is a submarine cable pulse detection receiver, 6 is a GPS locator, 7 is a diving detection rod, 8 is a diving depth sounder, 9 is an underwater high-definition camera, 10 is a data acquisition unit, 11 is a data storage unit, 12 is a data processing unit, 13 is a submarine cable fault location unit, 14 is a computer, 15 is a data connection line, 16 is an underwater data transmission line, and 17 is a three-phase turnkey submarine high-voltage cable made of cross-linked polyethylene insulation material. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and is not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0029] The accompanying drawings show schematic diagrams of structures according to embodiments disclosed in the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0030] refer to Figure 1 The long-distance high-voltage submarine cable fault accurate positioning system of the present invention comprises a submarine cable pulse detection receiver 5, a GPS locator 6, a diving detection rod 7, a diving depth sounder 8, an underwater high-definition camera 9, an underwater data transmission line 16, a data acquisition unit 10, a data storage unit 11, a data processing unit 12, a submarine cable fault positioning unit 13, a computer 14, a data connection line 15, a submarine cable insulation tester 1 for testing the insulation of a three-phase turnkey submarine high-voltage cable 17 made of cross-linked polyethylene insulation material, a DC high-voltage large current generator 2 for pressurizing and increasing the current at the fault point of the three-phase turnkey submarine high-voltage cable 17 made of cross-linked polyethylene insulation material, a TDR pulse time domain reflection tester 3 for pre-positioning the fault point of the three-phase turnkey submarine high-voltage cable 17 made of cross-linked polyethylene insulation material, and a submarine cable pulse generator 4 for pulse discharge at the fault point of the three-phase turnkey submarine high-voltage cable 17 made of cross-linked polyethylene insulation material;

[0031] The submarine cable pulse detection receiver 5, the GPS locator 6, the diving detection rod 7, the diving depth sounder 8 and the underwater high-definition camera 9 are connected to the data acquisition unit 10 through the underwater data transmission line 16, the output end of the data acquisition unit 10 is connected to the data storage unit 11 and the data processing unit 12, the output end of the data processing unit 12 is connected to the submarine cable fault locating unit 13, and the computer 14 is connected to the data storage unit 11, the data processing unit 12 and the submarine cable fault locating unit 13 through the data connection line 15.

[0032] refer to Figure 4 The method for accurately determining a long-distance high-voltage submarine cable fault of the present invention comprises the following steps:

[0033] 1) Performing insulation test on cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable 17 using submarine cable insulation tester 1. When the measured insulation test value is less than the preset value (10Ω), go to step 3); when the measured insulation test value is greater than the preset value, go to step 2);

[0034] 2) Using a DC high-voltage and high-current generator 2 to pressurize and increase the current of a three-phase turnkey submarine high-voltage cable 17 made of cross-linked polyethylene insulation material, ablate the fault point, and when the voltage changes from increasing to decreasing, stop pressurizing, and then use a submarine cable insulation tester 1 to perform an insulation test on the three-phase turnkey submarine high-voltage cable 17 made of cross-linked polyethylene insulation material, so that the measured insulation test value is less than a preset value, and then go to step 3);

[0035] 3) Using a TDR pulse time domain reflectometer 3, a pre-positioning test is performed on the fault point of a three-phase turnkey submarine high-voltage cable 17 made of cross-linked polyethylene insulation material to obtain the length of the submarine cable from the fault point to the test point;

[0036] 4) Use the GPS locator 6 to locate the position of the test point to obtain the position information of the test point;

[0037] 5) Using the submarine cable pulse generator 4 to perform pulse discharge on the fault point of the cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable 17;

[0038] 6) Using the submarine cable pulse detection receiver 5, the fault point of the cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable 17 is located.

[0039] refer to Figure 2 , the specific operation of step 6) is:

[0040] 61) The probe of the submarine cable pulse detection receiver 5 is parallel to the sea level and perpendicular to the direction of the submarine cable, and passes through the cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable 17 to preliminarily determine the position of the cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable 17. When the probe gradually approaches the cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable 17, the signal received by the submarine cable pulse detection receiver 5 gradually increases. When the probe passes directly above the cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable 17, the signal received by the submarine cable pulse detection receiver 5 is the strongest. The submarine cable pulse detection receiver 5 transmits the received signal to the data acquisition unit 10, and then stores it in the data storage unit 11. At the same time, it has been processed by the data processing unit 12 to determine the position of the strongest signal point, and then the position of the strongest signal point is sent to the computer 14; at the same time, the GPS locator 6 obtains the longitude and latitude information of the position of the strongest signal point and sends it to the computer 14;

[0041] 62) The towing vessel moves along the cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable 17 in an S-shaped route toward the fault point, sampling points while approaching the fault point, and at the same time, the computer 14 compares and corrects the test route of the cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable 17 with the original initial route to obtain the length of the current test point from the test point of the TDR pulse time domain reflection tester 3, thereby obtaining the distance from the test point to the fault point;

[0042] When the towing boat is getting closer to the fault point, the span of "S" can be smaller. When the test point reaches the fault point and the submarine cable position is not found by the "S" shaped route, it means that the towing boat has exceeded the broken end. At this time, the submarine cable position can be found by the "S" shaped route with a small span in the opposite direction.

[0043] 7) When the fault point detected by the submarine cable pulse detection receiver 5 coincides with the actual route and fault distance of the cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable 17, the towing vessel stops, and the diver carries the diving probe 7, the diving depth sounder 8 and the underwater high-definition camera 9 to enter the water for actual survey;

[0044] The diver places the depth sounder 8 horizontally on the seabed, and the operator on the towing ship judges and directs the diver's operation based on the three red, green and yellow waveforms. Figure 3 As shown, red, green and yellow represent the head, tail and middle of the instrument respectively. When the submersible depth sounder 8 is far away from the top of the submarine cable, the red and green change slowly. The submersible depth sounder 8 moves in the direction represented by the larger value of the red and green lines until the red and green lines have dead points respectively. The middle of the two dead points is just above the submarine cable. The submersible depth sounder 8 is erected above the submarine cable, as shown in FIG. Figure 3 As shown, the position is corrected with a yellow line dummy point, the instrument is slowly rotated within a range of 180°, and the processing is performed through a computer 14, and the minimum buried depth reading is the buried depth value of the submarine cable.

[0045] 8) The test results are transmitted to the data acquisition unit 10 via the underwater data transmission line 16, and the computer 14 is used to analyze and judge the survey results.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A long-distance high-voltage submarine cable fault accurate positioning system, characterized in that: The invention comprises a submarine cable pulse detection receiver (5), a GPS locator (6), a data acquisition unit (10), a data processing unit (12), a submarine cable fault locating unit (13), a computer (14), a submarine cable insulation tester (1) for testing the insulation of a three-phase turnkey submarine high-voltage cable (17) made of cross-linked polyethylene insulation material, a DC high-voltage large current generator (2) for pressurizing and increasing the current at a fault point of the three-phase turnkey submarine high-voltage cable (17) made of cross-linked polyethylene insulation material, a TDR pulse time domain reflection tester (3) for pre-positioning the fault point of the three-phase turnkey submarine high-voltage cable (17) made of cross-linked polyethylene insulation material, and a submarine cable pulse generator (4) for pulse discharge at the fault point of the three-phase turnkey submarine high-voltage cable (17) made of cross-linked polyethylene insulation material; The submarine cable pulse detection receiver (5) and the GPS locator (6) are connected to the data acquisition unit (10), the output end of the data acquisition unit (10) is connected to the data processing unit (12), the output end of the data processing unit (12) is connected to the submarine cable fault locating unit (13), and the computer (14) is connected to the data processing unit (12) and the submarine cable fault locating unit (13); The submarine cable pulse detection receiver (5) and the GPS locator (6) are connected to the data acquisition unit (10) via an underwater data transmission line (16); The computer (14) is connected to the data processing unit (12) and the submarine cable fault locating unit (13) via a data connection line (15).

2. The long-distance high-voltage submarine cable fault accurate positioning system according to claim 1 is characterized in that: It also comprises a diving detection rod (7) and a diving depth sounder (8), and the diving detection rod (7) and the diving depth sounder (8) are connected to the data acquisition unit (10) via an underwater data transmission line (16).

3. The long-distance high-voltage submarine cable fault accurate positioning system according to claim 1 is characterized in that: It also includes an underwater high-definition camera (9), which is connected to the data acquisition unit (10) via an underwater data transmission line (16).

4. The long-distance high-voltage submarine cable fault accurate positioning system according to claim 1 is characterized in that: It also includes a data storage unit (11); a data acquisition unit (10) and a computer (14) are connected to the data storage unit (11).

5. A method for accurately locating long-distance high-voltage submarine cable faults, characterized in that: The long-distance high-voltage submarine cable fault accurate positioning system according to claim 1 comprises the following steps: 1) using a submarine cable insulation tester (1) to perform an insulation test on a three-phase turnkey submarine high-voltage cable (17) made of cross-linked polyethylene insulation material; when the insulation test value obtained by measurement is less than a preset value, the process proceeds to step 3); when the insulation test value obtained by measurement is greater than the preset value, the process proceeds to step 2); 2) using a DC high-voltage and high-current generator (2) to pressurize and increase the current of a three-phase turnkey submarine high-voltage cable (17) made of cross-linked polyethylene insulation material, and to ablate the fault point; when the voltage changes from increasing to decreasing, the pressurization is stopped, and then a submarine cable insulation tester (1) is used to perform an insulation test on the three-phase turnkey submarine high-voltage cable (17) made of cross-linked polyethylene insulation material, so that the measured insulation test value is less than a preset value, and then the process proceeds to step 3); 3) using a TDR pulse time domain reflectometer (3) to perform a pre-positioning test on the fault point of a three-phase turnkey submarine high-voltage cable (17) made of cross-linked polyethylene insulation material, and obtaining the length of the submarine cable from the fault point to the test point; 4) Using a GPS locator (6) to locate the position of the test point, and obtain the position information of the test point; 5) using a submarine cable pulse generator (4) to perform pulse discharge on a fault point of a cross-linked polyethylene insulation material three-phase turnkey submarine high-voltage cable (17); 6) Using a submarine cable pulse detection receiver (5) to locate the fault point of a cross-linked polyethylene insulation material three-phase all-in-one submarine high-voltage cable (17).

6. The method for accurately locating long-distance high-voltage submarine cable faults according to claim 5 is characterized in that: The default value is 10Ω.

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