Three-dimensional cable fault positioning system

Abstract

According to the three-dimensional cable fault positioning system, sonic sensors are uniformly distributed in a probe shell of a positioning instrument, a circuit system is characterized in that the sonic sensors and electromagnetic wave sensors are in signal connection with a signal conditioning circuit, the signal conditioning circuit is connected with a programmable amplifier, and the programmable amplifier is connected with an A / D converter; the programmable amplifier and the A / D converter are connected with a data processing unit; the data processing unit is connected with a keyboard and an LCD display screen; the whole circuit is powered by the power circuit; the cable fault positioning instrument is used for cable fault positioning, can provide accurate coordinates and distances of cable fault points, improves the cable fault point positioning efficiency, achieves the purpose of three-dimensional cable fault visual point positioning, improves the cable fault point positioning efficiency, has better technical and economic performance, and is convenient to implement.

Description

Technical Field

[0001] The utility model belongs to the field of electric energy technology, and relates to a three-dimensional cable fault positioning system, and specifically to a three-dimensional cable fault visualization positioning method in a cable fault positioning instrument and equipment technology required for power generation, transmission, and power supply cable operation and maintenance, so as to improve the efficiency of cable fault positioning. Background Art

[0002] With the rapid development of urbanization and the beautification and improvement of urban public environment, a large number of overhead power transmission and power line transformations have been implemented, and the use of underground cables of various voltage levels has increased rapidly.

[0003] However, practice has shown that outsourcing of cable laying construction projects and rushing to meet deadlines have resulted in less strict implementation of on-site construction processes, which is the main cause of cable insulation hazards and subsequent cable failures.

[0004] Practice has proved that the cross-construction of various municipal projects is another major cause of underground cables being damaged by external forces and causing cable failures.

[0005] The rapid increase in cable usage, coupled with non-standard cable construction, outsourcing of various municipal engineering projects, rushing of deadlines, cross-construction and other external force damage, has caused underground cable failures, endangering the safe operation of the power grid.

[0006] The emergency repair technology of cable faults must first be able to find the cable fault point in time. The so-called cable fault location mainly refers to the pre-location of cable faults, cable path verification, and cable fault positioning technology.

[0007] At present, cable fault pre-location and cable path verification technologies in cable fault location technology have good technical means to solve the problem; in practice, cable fault location technology is still a technical problem that needs to be further solved to improve the efficiency of cable fault location.

[0008] In the market, a cable fault locator using the acoustic-magnetic synchronous acoustic detection method is currently widely used to detect cable fault points. The structure has an integrated structure and a split structure. The functional circuit has an acoustic-magnetic synchronous acoustic detection method headphone listening test and an acoustic-magnetic synchronous acoustic detection method digital display detection point.

[0009] The more advanced acoustic and magnetic synchronous acoustic testing method combines the acoustic and magnetic dual waveforms and digitally displays the distance between the probe and the fault point, realizing the dual functions of cable path verification and cable fault location. It can basically solve the problem of cable fault location. However, when encountering difficult cable faults, there is still technical room for improvement in the intuitiveness and efficiency of locating the cable fault point.

[0010] In recent years, a company has proposed a patented technology that uses dual sonar probe technology to find submarine cable paths and submarine cable fault points. This technology can give the approximate direction of the cable fault point. This technology can also be used to accurately locate cable fault points on land. Theoretically, it should be feasible, but land cables are different from submarine cables. Even low-frequency electromagnetic waves generated by submarine cable fault points in seawater decay quickly, while low-frequency sound waves and ultrasonic waves decay very little and can propagate very far, which is conducive to its application in submarine cable fault location. The low-frequency electromagnetic waves generated by the fault points of land cables buried underground decay very little, while low-frequency sound waves and ultrasonic waves decay very quickly and have a very small propagation distance, often less than 5m, and even often less than 1m. The range is too small, which will bring blindness to the locating of land cable faults and limit its performance in locating land cable faults. However, this is also a technical advancement in locating land cable faults, because it can at least give the approximate direction of the cable fault point compared to other existing technologies.

[0011] The application condition of this patented technology is that it requires dual probe operation. It is necessary to repeatedly move the dual probes of the cable fault locator using this technology according to the general direction given by each detection, gradually approaching the cable fault point, which is a bit inconvenient and may be difficult to operate in certain on-site environments.

[0012] As mentioned above, how to improve the efficiency of locating cable fault points and shorten the repair time of cable faults is becoming more and more important. A set of cable fault locating system equipment with proprietary technology is required, which should include three units: high-precision cable fault pre-location instrument, wide-range and high-precision cable fault positioning instrument, and supporting lightweight multifunctional high-voltage power supply.

[0013] It can be seen that among the three units of the above-mentioned cable fault location instruments and equipment, the main bottleneck in the efficiency of cable fault location is the technical method of locating the cable fault point. Summary of the invention

[0014] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the utility model is to provide a three-dimensional cable fault positioning system for cable fault positioning. It is suitable to design a cable fault positioning instrument based on this utility model, which can give the accurate coordinates and distance of the cable fault point, improve the efficiency of cable fault point positioning, achieve the purpose of three-dimensional cable fault visualization positioning, improve the efficiency of cable fault positioning, have good technical and economic performance, and are easy to implement.

[0015] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0016] A three-dimensional cable fault positioning system, comprising:

[0017] Acoustic wave sensors 1, 2, 3, electromagnetic wave sensor 4, signal conditioning circuit 5, programmable amplifier 6, A / D converter 7, data processing unit 8, power supply circuit 9, keyboard 10, LCD display screen 11, probe housing of the fixed-point instrument 12, waveform display area 13, azimuth map 14, fault point 15, fault point coordinate distance 16;

[0018] 2) The acoustic wave sensors 1, 2, and 3 need to be 3, at least 3;

[0019] 3) The acoustic wave sensors 1, 2, 3 are arranged in an equilateral triangle on concentric circles in the probe housing 12 of the fixed-point instrument and are independent of each other;

[0020] 4) The data processing unit 8 controls the program-controlled amplifier 6, the A / D converter 7 and the LCD display screen 11 to work together according to the internal program, and synchronously displays the waveforms of the four signals received and detected by the sensors 1, 2, 3 and 4;

[0021] 5) The equilateral triangle formed by the acoustic wave sensors 1, 2, 3 and the cable fault point 15 form a four-point cubic solid. The data processing unit 8 automatically analyzes the waveform data detected according to the internal program, and provides the cable fault point azimuth map with the center of the equilateral triangle formed by the acoustic wave sensors 1, 2, 3 as the reference origin, as well as the coordinate distance and the straight-line distance, and intuitively displays them on the LCD display screen 11;

[0022] 6) The waveform display area 13, azimuth map 14, fault point 15, and fault point coordinate distance 16 display the cable fault point location results.

[0023] A circuit system is fixed inside the probe housing (12) of the pinpointing instrument. Acoustic wave sensors (1, 2, 3) are evenly distributed inside the probe housing (12) of the pinpointing instrument. The entire circuit is powered by a power supply circuit (9).

[0024] The equilateral triangle formed by the acoustic wave sensors (1, 2, 3) and the cable fault point (15) form a four-point cubic solid.

[0025] The beneficial effects of the utility model are:

[0026] It can realize the purpose of three-dimensional cable fault visualization and positioning, improve the efficiency of cable fault positioning, have good technical and economic performance, and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a three-dimensional cable fault positioning system of the utility model;

[0028] Figure 2 This is a schematic diagram of the layout of the concentric circles and equilateral triangles of the acoustic wave sensor of the utility model;

[0029] Figure 3 This is a schematic diagram of the LCD display waveform, fault point location, distance and coordinates of the utility model.

[0030] Among them: acoustic wave sensors 1, 2, 3, electromagnetic wave sensor 4, signal conditioning circuit 5, programmable amplifier 6, A / D converter 7, data processing unit 8, power supply circuit 9, keyboard 10, LCD display screen 11, fixed-point instrument probe housing 12, waveform display area 13, azimuth map 14, fault point 15, fault point coordinate distance 16; DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings.

[0032] As shown in the figure, a three-dimensional cable fault positioning system includes: acoustic wave sensors 1, 2, 3, electromagnetic wave sensor 4, signal conditioning circuit 5, programmable amplifier 6, A / D converter 7, data processing unit 8, power supply circuit 9, keyboard 10, LCD display screen 11, positioning instrument probe housing 12, waveform display area 13, azimuth map 14, fault point 15, fault point coordinate distance 16;

[0033] You need at least three acoustic wave sensors 1, 2, and 3;

[0034] The acoustic wave sensors 1, 2, and 3 are arranged in an equilateral triangle on concentric circles within the probe housing 12 of the fixed-point instrument and are independent of each other. Figure 2 As shown;

[0035] The data processing unit 8 controls the program-controlled amplifier 6, the A / D converter 7 and the LCD display screen 11 to work together according to the internal program, and synchronously displays the waveforms of the four-way signals received and detected by the sensors 1, 2, 3 and 4;

[0036] The equilateral triangle formed by the acoustic wave sensors 1, 2, 3 and the cable fault point 15 form a four-point cubic solid. The data processing unit 8 automatically analyzes the waveform data detected according to the internal program, and provides a cable fault point orientation map 15 and a coordinate distance and a straight-line distance 16 with the cable fault point relative to the center of the equilateral triangle formed by the acoustic wave sensors 1, 2, 3 as the reference origin, and intuitively displays them on the LCD display screen 11;

[0037] A circuit system is fixed inside the probe housing (12) of the pinpointing instrument. Acoustic wave sensors (1, 2, 3) are evenly distributed inside the probe housing (12) of the pinpointing instrument. The entire circuit is powered by a power supply circuit (9).

[0038] The equilateral triangle formed by the data processing unit (8) and the cable fault point (15) form a four-point cubic solid.

[0039] The waveform display area 13, azimuth map 14, fault point 15, and fault point coordinate distance 16 show the cable fault point positioning results, as shown in the attached manual. Figure 3 shown.

[0040] The principle of cable fault location is: the cable fault point generates large-energy electromagnetic wave signals and sound wave signals under the action of the high-voltage power supply for fault point location. The sound wave sensors 1, 2, 3 and electromagnetic wave sensor 4 of the three-dimensional cable fault location device detect and receive the signals and connect them to the signal conditioning circuit 5 for signal processing. The output is connected to the program-controlled amplifier 6 for program-controlled amplification, and the output is connected to the A / D converter for digital-to-analog conversion. The converted data output is connected to the data processing unit 8 for data analysis and processing. The built-in program of the data processing unit 8 automatically displays the electromagnetic waves and sound waves detected by each sensor based on the four-way signal data obtained by the fixed-point detection. The waveform is automatically analyzed and calculated, and the time difference △t between the electromagnetic wave signal and the sound wave signal is calculated. Here, since the propagation speed of the electromagnetic wave is much greater than the propagation speed of the sound wave, it is assumed that there is no time delay between the electromagnetic wave generated by the discharge at the cable fault point and the electromagnetic wave sensor of the three-dimensional cable fault determination instrument receiving the electromagnetic wave. Therefore, when the data processing unit 8 performs test data analysis, the moment of receiving the electromagnetic wave is used as the starting point of the timer, and the moment of receiving the sound wave is used as the end point of the timer; and further, according to the distance formula S=v*△t (v: the propagation speed of the sound wave - referred to as the wave speed), it is automatically converted into the distance between each sound wave sensor and the cable fault point;

[0041] The built-in program of the data processing unit 8 automatically performs a three-dimensional geometric analysis on the four-point cubic figure formed by the three sensors and the cable fault point 15 based on the distance from the acoustic wave sensors 1, 2, 3 to the cable fault point obtained by the above test, and obtains that the center of the acoustic wave sensors 1, 2, 3 arranged in an equilateral triangle is the reference origin. The reference origin to the acoustic wave sensor 1 is the X axis, and the direction perpendicular to the ground is the Z axis. The cable fault location result is intuitively displayed on the orientation diagram 14 of the LCD display screen 11: F fault point 15, S straight line distance, XYZ coordinate distance value 16, as shown in the attached manual Figure 3 As shown, S=1.81m, X=1.52m, Y=0.49m, Z=-0.82m.

[0042] For example, if the cable fault point is just below the positioning instrument, the test result will be displayed: S=0.71m, X=0.00m, Y=0.00m, Z=-0.71m.

[0043] This S=Z=0.71m is the depth of the cable fault point.

[0044] Based on these coordinates, excavation can be arranged, and the cable fault point can be further confirmed, and emergency repair work can be carried out at the cable fault point.

[0045] It can realize the purpose of three-dimensional cable fault visualization and positioning, improve the efficiency of cable fault positioning, is simple to use, has good technical and economic performance, and is easy to implement.

Claims

1. A three-dimensional cable fault locating system, comprising a locating probe housing (12), a circuit system fixed within the locating probe housing (12), and characterized in that: The probe housing (12) of the fixed-point instrument is uniformly distributed with acoustic wave sensors (1, 2, 3). The circuit system comprises: the acoustic wave sensors (1, 2, 3) and the electromagnetic wave sensor (4) are connected to the signal conditioning circuit (5), the signal conditioning circuit (5) is connected to the programmable amplifier (6), the programmable amplifier (6) is connected to the A / D converter (7), the programmable amplifier (6) and the A / D converter (7) are connected to the data processing unit (8), and the data processing unit (8) is connected to the keyboard (10) and the LCD display (11); the entire circuit is powered by the power supply circuit (9).

2. A three-dimensional cable fault location system according to claim 1, characterized in that: There are at least three acoustic wave sensors (1, 2, 3).

3. A three-dimensional cable fault location system according to claim 1, characterized in that: The acoustic wave sensors (1, 2, 3) are arranged in an equilateral triangle on concentric circles within the probe housing (12) of the fixed-point instrument and are independent of each other.

4. A three-dimensional cable fault location system according to claim 1, characterized in that: The data processing unit (8) controls the programmable amplifier (6), the A / D converter (7) and the LCD display (11) to work in coordination according to an internal program, and synchronously displays the waveforms of the four signals received and detected by the acoustic wave sensors (1, 2, 3) and the electromagnetic wave sensor (4).

5. A three-dimensional cable fault location system according to claim 1, characterized in that: The equilateral triangle formed by the acoustic wave sensors (1, 2, 3) and the cable fault point (15) form a four-point cubic solid.

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