A cable fault accurate positioning system

Abstract

The present invention belongs to the technical field of cable detection. The present invention provides a cable fault accurate positioning system, comprising: detecting time data of a pulse reflection signal in a cable detection section, analyzing to obtain a cable fault detection section and a suspected position of a cable fault point, analyzing buried depth data to obtain a depth deviation performance value, if the depth deviation performance value SP is greater than a depth deviation performance threshold, generating an analysis signal; otherwise, generating a detection signal, and obtaining a depth influence value based on a combined analysis of electromagnetic data and buried depth data, if the depth influence value is greater than or equal to the depth influence threshold, generating a data correction signal, otherwise, generating a detection signal, if a detection signal is generated, the cable fault is accurately positioned through the electromagnetic data of the cable, if a data correction signal is generated, the cable fault is accurately positioned through the corrected electromagnetic data, and the present invention improves the accuracy of cable fault positioning.

Description

Technical Field

[0001] The invention belongs to the technical field of cable detection, in particular to a cable fault precise positioning system. Background Art

[0002] Due to the complex cable laying environment and poor operating conditions, cable faults occur frequently, seriously affecting the normal operation of the power system. Traditional cable fault location methods have the problem of low positioning accuracy. For example, when detecting cable short circuit faults through electromagnetic measurement, the measurement data will be affected by environmental factors, such as cable burial depth, temperature and humidity, which makes it difficult to meet the needs of modern power systems for accurate fault location.

[0003] A Chinese patent application with publication number CN117970040A discloses a cable fault location method, including: first using the existing impedance method to test the cable to find the cable with problems, then screening out the excitation signal sensitive to the cable fault through an experimental process to increase the accuracy of fault location, applying the excitation signal to the input end of the problematic cable, and then using a magnetic induction coil to detect various positions of the problematic cable. The frequency domain characteristics of the detection signal on the magnetic induction coil at each position reflect the fault characteristics of the problematic cable, and determining that there is a fault at that position through a fault location model.

[0004] In the above-mentioned prior art, the fault characteristics of the cable and the fault location are determined by analyzing the detection signal on the magnetic induction coil. However, during the signal detection and analysis, there is a lack of analysis of the factors affecting the signal data collection, and the accuracy of the detection signal data cannot be guaranteed, thereby failing to guarantee the accuracy of the fault analysis and fault location.

[0005] To this end, the present invention provides a cable fault precise positioning system. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a cable fault accurate positioning system, comprising:

[0008] Initial positioning module: The cable is divided into several cable detection sections according to the detection limit length specified by the pulse detector. The pulse detector is used to detect the time data of the pulse reflection signal in the cable detection section, where the time data includes the pulse signal delay time. Based on the analysis of the time data, the cable fault detection section and the suspected location of the cable fault point are obtained;

[0009] Operation analysis module: obtains the buried depth data of the cable detection section, wherein the buried depth data includes the buried depth of the cable, obtains the depth deviation performance value based on the analysis of the buried depth data, compares the depth deviation performance value with the depth deviation performance threshold, and generates an analysis signal if the depth deviation performance value SP is greater than the depth deviation performance threshold; generates a detection signal if the depth deviation performance value SP is less than or equal to the depth deviation performance threshold, and sends an analysis instruction to the impact analysis module if the analysis signal is obtained; and sends a detection instruction to the precise positioning module if the detection signal is generated;

[0010] Impact analysis module: receiving analysis instructions, obtaining electromagnetic data of the cable detection section, wherein the electromagnetic data includes electromagnetic intensity, obtaining a depth impact value based on combined analysis of the electromagnetic data and the buried depth data, comparing the depth impact value with the depth impact threshold, and generating a data correction signal if the depth impact value is greater than or equal to the depth impact threshold; generating a detection signal if the depth impact value is less than the depth impact value; and sending a data correction instruction to the precise positioning module if a data correction signal is generated; and sending a detection instruction to the precise positioning module if a detection signal is generated;

[0011] Precision positioning module: receives data correction instructions and detection instructions. If a detection instruction is received, the cable fault is accurately located through the electromagnetic data of the detected cable. If a data correction instruction is received, the detected electromagnetic data is corrected and the cable fault is accurately located through the corrected electromagnetic data.

[0012] As a further technical solution of the present invention, the cable fault detection section is obtained in the following manner:

[0013] Compare the pulse signal delay time with the pulse signal delay time threshold:

[0014] If the pulse signal delay time is less than or equal to the pulse signal delay time threshold, then the cable detection section is marked as a non-cable fault detection section;

[0015] If the pulse signal delay time is greater than the pulse signal delay time threshold, the cable detection section is marked as a cable fault detection section.

[0016] As a further technical solution of the present invention, the method for determining the suspected position of the cable fault point is:

[0017] In the cable fault detection section, the pulse signal delay time corresponding to the cable fault detection section is multiplied by the pulse signal emission rate and then divided by 2 to obtain the cable fault distance, and the suspected position of the cable fault point is determined according to the cable fault distance.

[0018] As a further technical solution of the present invention, the depth deviation performance value is obtained by:

[0019] The variance value FC of the cable burial depth data group and the cable burial depth deviation PC of the cable fault detection section are processed by the formula: The depth deviation performance value is obtained, where s1 and s2 are preset proportional coefficients, and Ln (FC*s2) represents the logarithmic function of the base e.

[0020] As a further technical solution of the present invention, the variance value FC of the cable burial depth data group and the cable burial depth deviation PC of the cable fault detection section are obtained as follows:

[0021] Obtain the cable burial depth of the non-cable fault detection section, integrate the cable burial depths of all non-cable fault detection sections into a cable burial depth data group, obtain the variance value of the cable burial depth data group, and mark it as FC;

[0022] The cable burial depths of all non-cable fault detection sections in the cable burial depth data group are summed and averaged to obtain the average cable burial depth of the non-cable fault detection section, and the average cable burial depth is subtracted from the cable burial depth of the cable fault detection section to obtain the cable burial depth deviation of the cable fault detection section, which is marked as PC.

[0023] As a further technical solution of the present invention, the depth influence value is obtained by:

[0024] The decreasing performance value XJ and the synchronous performance value TB are processed by the formula: The depth influence value YX is obtained, wherein a1 and a2 are both preset proportional coefficients.

[0025] As a further technical solution of the present invention, the method for obtaining the decline performance value XJ is:

[0026] Obtain the electromagnetic intensity and cable burial depth of the non-cable fault detection section, construct a rectangular coordinate system with the cable burial depth as the X-axis and the electromagnetic intensity as the Y-axis, and mark and connect the electromagnetic intensity of each non-cable fault detection section in the coordinate system to obtain an electromagnetic change polyline;

[0027] The electromagnetic variation polyline is divided into a plurality of polyline segments, wherein the connecting line between each two electromagnetic intensity data points is a polyline segment;

[0028] Measure the slope value of each broken line segment. If the slope value of the broken line segment is less than 0, mark the broken line segment as a descending broken line segment. If the slope value of the broken line segment is greater than or equal to 0, mark the broken line segment as a non-descending broken line segment.

[0029] The number of descending broken line segments in the broken line segments is counted and the ratio is processed with the total number of broken line segments to obtain the descending performance value, which is marked as XJ.

[0030] As a further technical solution of the present invention, the synchronous performance value TB is obtained in the following manner:

[0031] The vertical length and the horizontal length of the descending polyline segment are obtained, and the ratio processing is performed to obtain the change ratio of the descending polyline segment, the change ratios of all the descending polyline segments are summed and averaged to obtain the change ratio mean, the change ratio of the descending polyline segment is subjected to difference processing with the change ratio mean, and the absolute value of the difference is taken to obtain the change ratio difference of the descending polyline segment, the change ratio differences of all the descending polyline segments are summed and averaged to obtain the change ratio average difference, and the change ratio difference of the descending polyline segment is compared with the change ratio average difference;

[0032] If the change ratio difference of the descending broken line segment is greater than the average change ratio difference, the descending broken line segment is marked as a synchronous descending broken line segment;

[0033] If the change ratio difference of the descending broken line segment is less than or equal to the change ratio average difference, the descending broken line segment is marked as an asynchronous descending broken line segment;

[0034] The number of synchronous descending broken line segments is counted and the ratio is processed with the number of descending broken line segments to obtain the synchronous performance value, which is marked as TB.

[0035] As a further technical solution of the present invention, the process of accurately locating the cable fault by detecting the electromagnetic data of the cable is as follows:

[0036] Obtain the electromagnetic intensity at the suspected location of the cable fault point and the electromagnetic intensity of all non-cable fault detection sections, sum and average the electromagnetic intensity of all non-cable fault detection sections to obtain the normal electromagnetic intensity, and compare the electromagnetic intensity at the suspected location of the cable fault point with the normal electromagnetic intensity;

[0037] If the electromagnetic intensity at the suspected position of the cable fault point is greater than the normal electromagnetic intensity, the electromagnetic intensity at the suspected position of the cable fault point is subjected to difference processing with the normal electromagnetic intensity to obtain an electromagnetic intensity difference, and the electromagnetic intensity difference is compared with an electromagnetic intensity difference threshold. If the electromagnetic intensity difference is greater than the electromagnetic intensity difference threshold, the suspected position of the cable fault point is the cable fault point position. If the electromagnetic intensity difference is less than or equal to the electromagnetic intensity difference threshold, the suspected position of the cable fault point is not the cable fault point position, and a troubleshooting signal is generated.

[0038] If the electromagnetic intensity at the suspected location of the cable fault point is less than or equal to the normal electromagnetic intensity, a troubleshooting signal is generated;

[0039] Based on the troubleshooting signal, the electromagnetic intensity at different electromagnetic detection points on the cable fault detection section is obtained and compared with the normal electromagnetic intensity. If the electromagnetic intensity at the electromagnetic detection point is greater than the normal electromagnetic intensity and the electromagnetic intensity difference is greater than the electromagnetic intensity difference threshold, the electromagnetic detection point is marked as a cable fault point to be determined. Among the cable fault points to be determined, the cable fault point to be determined with the largest electromagnetic intensity is screened out, which is the cable fault point, and its position is the cable fault point position.

[0040] As a further technical solution of the present invention, the process of accurately locating the cable fault by using the corrected electromagnetic data is as follows:

[0041] Obtain the electromagnetic intensity at the suspected location of the cable fault point and the cable burial depth, multiply the cable burial depth by the mean of the variation ratio to obtain a correction value of the electromagnetic intensity at the suspected location of the cable fault point, sum the electromagnetic intensity at the suspected location of the cable fault point with the correction value of the electromagnetic intensity at the suspected location of the cable fault point, and obtain the actual electromagnetic intensity at the suspected location of the cable fault point;

[0042] Obtain the electromagnetic strength and cable burial depth of each non-cable fault detection section, multiply the cable burial depth of the non-cable fault detection section by the mean value of the variation ratio to obtain the electromagnetic strength correction value of the non-cable fault detection section, sum the electromagnetic strength of the non-cable fault detection section with the electromagnetic strength correction value to obtain the actual electromagnetic strength of the non-cable fault detection section, sum and average the actual electromagnetic strengths of all non-cable fault detection sections to obtain the normal electromagnetic strength;

[0043] The actual electromagnetic intensity at the suspected location of the cable fault point is compared and analyzed with the normal electromagnetic intensity to determine the location of the cable fault point.

[0044] The beneficial effects of the present invention are as follows: the cable is divided into several cable detection sections according to the detection limit length specified by the pulse detector, the pulse detector is used to detect the time data of the pulse reflection signal in the cable detection section, and the cable fault detection section and the suspected position of the cable fault point are obtained based on the analysis of the time data. Secondly, based on the analysis of the buried depth data, the depth deviation performance value is obtained, and the depth deviation performance value is compared with the depth deviation performance threshold. If the depth deviation performance value SP is greater than the depth deviation performance threshold, an analysis signal is generated; if the depth deviation performance value SP is less than or equal to the depth deviation performance threshold, a detection signal is generated. If an analysis signal is obtained, an analysis instruction is sent to the impact analysis module. If a detection signal is generated, a detection instruction is sent to the precise positioning module. If an analysis instruction is generated, the electromagnetic data of the cable detection section is obtained, and the depth influence value is obtained based on the combined analysis of the electromagnetic data and the buried depth data. The depth influence value is compared with the depth influence threshold. If the depth influence value is greater than or equal to the depth influence threshold, a data correction signal is generated. If the depth influence value is less than the depth influence value, a detection signal is generated. If a data correction signal is generated, a data correction instruction is sent to the precise positioning module. If a detection signal is generated, a detection instruction is sent to the precise positioning module. If the precise positioning module receives the detection instruction, the cable fault is accurately located through the electromagnetic data of the detected cable. If a data correction instruction is received, the detected electromagnetic data is corrected, and the cable fault is accurately located through the corrected electromagnetic data. The present invention first uses a pulse detection method to determine the suspected position of the cable fault, and then analyzes the buried depth of the cable. If the buried depth deviation of the cable is small, the cable fault is accurately located through the detected electromagnetic data. If the buried depth deviation of the cable is large, it is analyzed whether the buried depth of the cable will affect the accuracy of the electromagnetic data. If it does, the detected electromagnetic data is corrected, and the cable fault is accurately located through the corrected electromagnetic data. If it does not, similarly, the cable fault is accurately located through the detected electromagnetic data. The present invention uses pulse detection and electromagnetic detection to locate the cable fault, and accurately corrects the electromagnetic data collected, thereby improving the accuracy of cable fault location. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] Figure 1 is a flowchart of a cable fault accurate positioning system according to Embodiment 1 of the present invention;

[0047] Figure 2 It is a flow chart of the steps of data correction in a cable fault precise positioning system described in Example 1 of the present invention. DETAILED DESCRIPTION

[0048] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0049] Embodiment, a cable fault accurate positioning system according to an embodiment of the present invention comprises:

[0050] Initial positioning module: The cable is divided into several cable detection sections according to the detection limit length specified by the pulse detector. The pulse detector is used to detect the time data of the pulse reflection signal in the cable detection section, where the time data includes the pulse signal delay time. Based on the analysis of the time data, the cable fault detection section and the suspected location of the cable fault point are obtained;

[0051] It should be noted that the purpose of dividing the cables according to the detection limit length specified by the pulse detector is that within the detection limit length, the signal emitted by the pulse detector will not be severely attenuated, thereby improving the accuracy of fault location;

[0052] In some embodiments, a pulse detector transmits a pulse signal in the initial section of the cable detection section, and records the time when the pulse reflection signal is received, and calculates the difference between it and the normal time of the pulse reflection signal, so as to obtain time data;

[0053] Specifically, the emission rate of the pulse signal and the length of the cable detection section are obtained, the length of the cable detection section is multiplied by 2 and then the ratio is processed with the emission rate of the pulse signal to obtain the normal time of the pulse reflection signal, and the difference between the recorded time of the pulse reflection signal and the time when the pulse reflection signal is normal is processed to obtain the pulse signal delay time;

[0054] In some implementations, the pulse signal delay time is compared to a pulse signal delay time threshold:

[0055] If the pulse signal delay time is less than or equal to the pulse signal delay time threshold, then the cable detection section is marked as a non-cable fault detection section;

[0056] If the pulse signal delay time is greater than the pulse signal delay time threshold, the cable detection section is marked as a cable fault detection section;

[0057] In the cable fault detection section, the pulse signal delay time corresponding to the cable fault detection section is multiplied by the pulse signal emission rate and then divided by 2 to obtain the cable fault distance, and the suspected position of the cable fault point is determined according to the cable fault distance;

[0058] Operation analysis module: obtains the buried depth data of the cable detection section, wherein the buried depth data includes the buried depth of the cable, obtains the depth deviation performance value based on the analysis of the buried depth data, compares the depth deviation performance value with the depth deviation performance threshold, and generates an analysis signal if the depth deviation performance value SP is greater than the depth deviation performance threshold; generates a detection signal if the depth deviation performance value SP is less than or equal to the depth deviation performance threshold, and sends an analysis instruction to the impact analysis module if the analysis signal is obtained; and sends a detection instruction to the precise positioning module if the detection signal is generated;

[0059] In some embodiments, a plurality of depth collection points are equidistantly arranged in the cable detection section, and the buried depth of the cable at each collection point is obtained, and the buried depth of the cable at each collection point in the cable detection section is summed and averaged to obtain the buried depth of the cable in the cable detection section;

[0060] It should be noted that the buried depth of the cable at each collection point can be obtained through the depth data recorded when the cable is buried;

[0061] Obtain the cable burial depth of the non-cable fault detection section, integrate the cable burial depths of all non-cable fault detection sections into a cable burial depth data group, obtain the variance value of the cable burial depth data group, and mark it as FC;

[0062] The cable burial depths of all non-cable fault detection sections in the cable burial depth data group are summed and averaged to obtain the average cable burial depth of the non-cable fault detection section, and the average cable burial depth is subtracted from the cable burial depth of the cable fault detection section to obtain the cable burial depth deviation of the cable fault detection section, which is marked as PC;

[0063] The variance value FC of the cable burial depth data group and the cable burial depth deviation PC of the cable fault detection section are processed, and the formula is: The depth deviation performance value is obtained, where s1 and s2 are preset proportional coefficients, and Ln (FC*s2) represents the logarithmic function of the base e;

[0064] In some embodiments, the depth deviation performance value SP is compared with a depth deviation performance threshold;

[0065] If the depth deviation performance value SP is greater than the depth deviation performance threshold, an analysis signal is generated;

[0066] If the depth deviation performance value SP is less than or equal to the depth deviation performance threshold, a detection signal is generated;

[0067] It should be noted that the meaning of the depth deviation performance value SP is: the smaller the depth deviation performance value SP is, the smaller the deviation between the cable burial depths of each non-cable fault detection section is, and the smaller the cable burial depth of the cable fault detection section is and the average cable burial depth of the non-cable fault detection section is, the closer the cable burial depths in each detection section are, and the fault location can be directly determined by the measured electromagnetic data; the larger the depth deviation performance value SP is, the larger the deviation between the cable burial depths of each non-cable fault detection section is, and the larger the cable burial depth of the cable fault detection section is and the average cable burial depth of the non-cable fault detection section is, the fault location cannot be directly determined by the measured electromagnetic data, and further analysis is needed to determine whether the cable burial depth will affect the change of the electromagnetic data;

[0068] Impact analysis module: receiving analysis instructions, obtaining electromagnetic data of the cable detection section, wherein the electromagnetic data includes electromagnetic intensity, obtaining a depth impact value based on combined analysis of the electromagnetic data and the buried depth data, comparing the depth impact value with the depth impact threshold, and generating a data correction signal if the depth impact value is greater than or equal to the depth impact threshold; generating a detection signal if the depth impact value is less than the depth impact value; and sending a data correction instruction to the precise positioning module if a data correction signal is generated; and sending a detection instruction to the precise positioning module if a detection signal is generated;

[0069] In some embodiments, an electromagnetic detector is used to set a number of electromagnetic detection points on the cable detection section to obtain the electromagnetic strength of the cable at the electromagnetic detection points, and the electromagnetic strength of the cable at the electromagnetic detection points is summed and averaged to obtain electromagnetic data of the cable detection section;

[0070] It should be noted that several electromagnetic detection points are set on the soil surface where the cables are buried;

[0071] Obtain the electromagnetic intensity and cable burial depth of the non-cable fault detection section, construct a rectangular coordinate system with the cable burial depth as the X-axis and the electromagnetic intensity as the Y-axis, and mark and connect the electromagnetic intensity of each non-cable fault detection section in the coordinate system to obtain an electromagnetic change polyline;

[0072] The electromagnetic variation polyline is divided into a plurality of polyline segments, wherein the connecting line between each two electromagnetic intensity data points is a polyline segment;

[0073] Measure the slope value of each broken line segment. If the slope value of the broken line segment is less than 0, mark the broken line segment as a descending broken line segment. If the slope value of the broken line segment is greater than or equal to 0, mark the broken line segment as a non-descending broken line segment.

[0074] Count the number of descending broken line segments in the broken line segments, and perform ratio processing with the total number of broken line segments to obtain the descending performance value, which is marked as XJ;

[0075] Obtain the vertical length and horizontal length of the descending polyline segment, and perform ratio processing on them to obtain the change ratio of the descending polyline segment, sum and average the change ratios of all the descending polyline segments to obtain the change ratio mean, perform difference processing on the change ratio of the descending polyline segment and the change ratio mean, and take the absolute value of the difference to obtain the change ratio difference of the descending polyline segment, sum and average the change ratio differences of all the descending polyline segments to obtain the change ratio average difference, and compare the change ratio difference of the descending polyline segment with the change ratio average difference;

[0076] If the change ratio difference of the descending broken line segment is greater than the average change ratio difference, the descending broken line segment is marked as a synchronous descending broken line segment;

[0077] If the change ratio difference of the descending broken line segment is less than or equal to the change ratio average difference, the descending broken line segment is marked as an asynchronous descending broken line segment;

[0078] The number of synchronous descending broken line segments is counted, and the ratio is processed with the number of descending broken line segments to obtain the synchronous performance value, which is marked as TB;

[0079] The obtained drop performance value XJ and synchronization performance value TB are processed by the formula: Obtain the depth influence value YX, where a1 and a2 are both preset proportional coefficients;

[0080] In some embodiments, the depth impact value YX is compared to a depth impact threshold;

[0081] If the depth impact value YX is greater than or equal to the depth impact threshold, a data correction signal is generated;

[0082] If the depth influence value YX is less than the depth influence value, a detection signal is generated;

[0083] It should be noted that the data correction signal indicates that the buried depth of the cable will affect the change of the cable electromagnetic data. The deeper the cable is buried, the smaller the electromagnetic strength of the measured cable will be. Therefore, when the cable fault is located through electromagnetic data, the measured electromagnetic data needs to be corrected according to the buried depth of the cable to make the electromagnetic data more accurate and improve the accuracy of cable fault location.

[0084] Precision positioning module: receives data correction instructions and detection instructions. If a detection instruction is received, the cable fault is accurately located through the electromagnetic data of the detected cable. If a data correction instruction is received, the electromagnetic data detected is corrected and the cable fault is accurately located through the corrected electromagnetic data.

[0085] Specifically, if a detection instruction is received, the electromagnetic intensity at the suspected position of the cable fault point and the electromagnetic intensity of all non-cable fault detection sections are obtained, the electromagnetic intensity of all non-cable fault detection sections are summed and averaged to obtain the normal electromagnetic intensity, and the electromagnetic intensity at the suspected position of the cable fault point is compared with the normal electromagnetic intensity;

[0086] If the electromagnetic intensity at the suspected position of the cable fault point is greater than the normal electromagnetic intensity, the electromagnetic intensity at the suspected position of the cable fault point is subjected to difference processing with the normal electromagnetic intensity to obtain an electromagnetic intensity difference, and the electromagnetic intensity difference is compared with an electromagnetic intensity difference threshold. If the electromagnetic intensity difference is greater than the electromagnetic intensity difference threshold, the suspected position of the cable fault point is the cable fault point position. If the electromagnetic intensity difference is less than or equal to the electromagnetic intensity difference threshold, the suspected position of the cable fault point is not the cable fault point position, and a troubleshooting signal is generated.

[0087] If the electromagnetic intensity at the suspected location of the cable fault point is less than or equal to the normal electromagnetic intensity, a troubleshooting signal is generated;

[0088] Based on the troubleshooting signal, the electromagnetic intensity at different electromagnetic detection points on the cable fault detection section is obtained and compared with the normal electromagnetic intensity. If the electromagnetic intensity at the electromagnetic detection point is greater than the normal electromagnetic intensity and the electromagnetic intensity difference is greater than the electromagnetic intensity difference threshold, the electromagnetic detection point is marked as a cable fault point to be determined. Among the cable fault points to be determined, the cable fault point to be determined with the largest electromagnetic intensity is selected, which is the cable fault point, and its position is the cable fault point position;

[0089] like Figure 2 As shown, if a data correction instruction is received, the electromagnetic intensity at the suspected position of the cable fault point and the cable burial depth are obtained, the cable burial depth is multiplied by the mean value of the variation ratio to obtain a correction value of the electromagnetic intensity at the suspected position of the cable fault point, and the electromagnetic intensity at the suspected position of the cable fault point and the correction value of the electromagnetic intensity at the suspected position of the cable fault point are summed to obtain the actual electromagnetic intensity at the suspected position of the cable fault point;

[0090] Similarly, the electromagnetic strength and cable burial depth of each non-cable fault detection section are obtained, the cable burial depth of the non-cable fault detection section is multiplied by the mean value of the variation ratio to obtain the electromagnetic strength correction value of the non-cable fault detection section, the electromagnetic strength of the non-cable fault detection section is summed with the electromagnetic strength correction value to obtain the actual electromagnetic strength of the non-cable fault detection section, the actual electromagnetic strength of all non-cable fault detection sections is summed and averaged to obtain the normal electromagnetic strength;

[0091] The actual electromagnetic intensity at the suspected location of the cable fault point is compared and analyzed with the normal electromagnetic intensity to determine the location of the cable fault point, wherein the principle of the comparative analysis method is the same as the principle of the comparative analysis method of the electromagnetic intensity at the suspected location of the cable fault point under the detection signal and the normal electromagnetic intensity.

[0092] The technical solution of the embodiment of the present invention is: the cable is divided into several cable detection sections according to the detection limit length specified by the pulse detector, the pulse detector is used to detect the time data of the pulse reflection signal in the cable detection section, based on the analysis of the time data, the cable fault detection section and the suspected position of the cable fault point are obtained, and secondly, based on the analysis of the buried depth data, the depth deviation performance value is obtained, and the depth deviation performance value is compared with the depth deviation performance threshold. If the depth deviation performance value SP is greater than the depth deviation performance threshold, an analysis signal is generated; if the depth deviation performance value SP is less than or equal to the depth deviation performance threshold, a detection signal is generated. If the analysis signal is obtained, an analysis instruction is sent to the impact analysis module. If the detection signal is generated, a detection instruction is sent to the precise positioning module. If the analysis instruction is generated, the electromagnetic data of the cable detection section is obtained, and the depth impact value is obtained based on the combined analysis of the electromagnetic data and the buried depth data. The depth impact value is compared with the depth impact threshold. If the depth impact value is greater than or equal to the depth impact threshold, a data correction signal is generated. If the depth impact value is less than the depth impact value, a detection signal is generated. Signal, if a data correction signal is generated, a data correction instruction is sent to the precise positioning module, if a detection signal is generated, a detection instruction is sent to the precise positioning module, if the precise positioning module receives the detection instruction, the cable fault is accurately located through the electromagnetic data of the detected cable, if a data correction instruction is received, the detected electromagnetic data is corrected, and the cable fault is accurately located through the corrected electromagnetic data. The present invention first uses a pulse detection method to determine the suspected position of the cable fault, and then analyzes the buried depth of the cable. If the buried depth deviation of the cable is small, the cable fault is accurately located through the detected electromagnetic data. If the buried depth deviation of the cable is large, it is analyzed whether the buried depth of the cable will affect the accuracy of the electromagnetic data. If it does, the detected electromagnetic data is corrected, and the cable fault is accurately located through the corrected electromagnetic data. If it does not, similarly, the cable fault is accurately located through the detected electromagnetic data. The present invention uses pulse detection and electromagnetic detection to realize cable fault location, and accurately corrects the electromagnetic data collected, thereby improving the accuracy of cable fault location.

[0093] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cable fault accurate positioning system, characterized by: include: Initial positioning module: The cable is divided into several cable detection sections according to the detection limit length specified by the pulse detector. The pulse detector is used to detect the time data of the pulse reflection signal in the cable detection section, where the time data includes the pulse signal delay time. Based on the analysis of the time data, the cable fault detection section and the suspected location of the cable fault point are obtained; The suspected location of the cable fault point is determined as follows: In the cable fault detection section, the pulse signal delay time corresponding to the cable fault detection section is multiplied by the pulse signal emission rate and then divided by 2 to obtain the cable fault distance, and the suspected position of the cable fault point is determined according to the cable fault distance; Operation analysis module: obtains the buried depth data of the cable detection section, wherein the buried depth data includes the buried depth of the cable, obtains the depth deviation performance value based on the analysis of the buried depth data, compares the depth deviation performance value with the depth deviation performance threshold, and generates an analysis signal if the depth deviation performance value SP is greater than the depth deviation performance threshold; generates a detection signal if the depth deviation performance value SP is less than or equal to the depth deviation performance threshold, and sends an analysis instruction to the impact analysis module if the analysis signal is obtained; and sends a detection instruction to the precise positioning module if the detection signal is generated; The depth deviation performance value is obtained as follows: The variance value FC of the cable burial depth data group and the cable burial depth deviation PC of the cable fault detection section are processed by the formula: The depth deviation performance value is obtained, where s1 and s2 are preset proportional coefficients, and Ln(FC*s2) represents the logarithmic function of the base e; Impact analysis module: receiving analysis instructions, obtaining electromagnetic data of the cable detection section, wherein the electromagnetic data includes electromagnetic intensity, obtaining a depth impact value based on combined analysis of the electromagnetic data and the buried depth data, comparing the depth impact value with the depth impact threshold, and generating a data correction signal if the depth impact value is greater than or equal to the depth impact threshold; generating a detection signal if the depth impact value is less than the depth impact threshold; and sending a data correction instruction to the precise positioning module if a data correction signal is generated; and sending a detection instruction to the precise positioning module if a detection signal is generated; Precision positioning module: receives data correction instructions and detection instructions. If a detection instruction is received, the cable fault is accurately located through the electromagnetic data of the detected cable. If a data correction instruction is received, the detected electromagnetic data is corrected and the cable fault is accurately located through the corrected electromagnetic data.

2. A cable fault precise positioning system according to claim 1, characterized in that: The cable fault detection section is obtained in the following manner: Compare the pulse signal delay time with the pulse signal delay time threshold: If the pulse signal delay time is less than or equal to the pulse signal delay time threshold, then the cable detection section is marked as a non-cable fault detection section; If the pulse signal delay time is greater than the pulse signal delay time threshold, the cable detection section is marked as a cable fault detection section.

3. A cable fault precise positioning system according to claim 1, characterized in that: The variance value FC of the cable burial depth data set and the cable burial depth deviation PC of the cable fault detection section are obtained as follows: Obtain the cable burial depth of the non-cable fault detection section, integrate the cable burial depths of all non-cable fault detection sections into a cable burial depth data group, obtain the variance value of the cable burial depth data group, and mark it as FC; The cable burial depths of all non-cable fault detection sections in the cable burial depth data group are summed and averaged to obtain the average cable burial depth of the non-cable fault detection section, and the average cable burial depth is subtracted from the cable burial depth of the cable fault detection section to obtain the cable burial depth deviation of the cable fault detection section, which is marked as PC.

4. A cable fault precise positioning system according to claim 1, characterized in that: The depth impact value is obtained as follows: The decreasing performance value XJ and the synchronous performance value TB are processed by the formula: Obtain the depth influence value YX, where a1 and a2 are both preset proportional coefficients; The method for obtaining the decline performance value XJ is as follows: Obtain the electromagnetic intensity and cable burial depth of the non-cable fault detection section, construct a rectangular coordinate system with the cable burial depth as the X-axis and the electromagnetic intensity as the Y-axis, and mark and connect the electromagnetic intensity of each non-cable fault detection section in the coordinate system to obtain an electromagnetic change polyline; The electromagnetic variation polyline is divided into a plurality of polyline segments, wherein the connecting line between each two electromagnetic intensity data points is a polyline segment; Measure the slope value of each broken line segment. If the slope value of the broken line segment is less than 0, mark the broken line segment as a descending broken line segment. If the slope value of the broken line segment is greater than or equal to 0, mark the broken line segment as a non-descending broken line segment. Count the number of descending broken line segments in the broken line segments, and perform a ratio process with the total number of broken line segments to obtain a descending performance value, which is marked as XJ; The synchronous performance value TB is obtained in the following manner: The vertical length and the horizontal length of the descending polyline segment are obtained, and the ratio processing is performed to obtain the change ratio of the descending polyline segment, the change ratios of all the descending polyline segments are summed and averaged to obtain the change ratio mean, the change ratio of the descending polyline segment is subjected to difference processing with the change ratio mean, and the absolute value of the difference is taken to obtain the change ratio difference of the descending polyline segment, the change ratio differences of all the descending polyline segments are summed and averaged to obtain the change ratio average difference, and the change ratio difference of the descending polyline segment is compared with the change ratio average difference; If the change ratio difference of the descending broken line segment is greater than the average change ratio difference, the descending broken line segment is marked as a synchronous descending broken line segment; If the change ratio difference of the descending broken line segment is less than or equal to the average change ratio difference, the descending broken line segment is marked as an asynchronous descending broken line segment; The number of synchronous descending broken line segments is counted and the ratio is processed with the number of descending broken line segments to obtain the synchronous performance value, which is marked as TB.

5. A cable fault precise positioning system according to claim 1, characterized in that: The process of accurately locating the cable fault by detecting the electromagnetic data of the cable is as follows: Obtain the electromagnetic intensity at the suspected location of the cable fault point and the electromagnetic intensity of all non-cable fault detection sections, sum and average the electromagnetic intensity of all non-cable fault detection sections to obtain the normal electromagnetic intensity, and compare the electromagnetic intensity at the suspected location of the cable fault point with the normal electromagnetic intensity; If the electromagnetic intensity at the suspected position of the cable fault point is greater than the normal electromagnetic intensity, the electromagnetic intensity at the suspected position of the cable fault point is subjected to difference processing with the normal electromagnetic intensity to obtain an electromagnetic intensity difference, and the electromagnetic intensity difference is compared with an electromagnetic intensity difference threshold. If the electromagnetic intensity difference is greater than the electromagnetic intensity difference threshold, the suspected position of the cable fault point is the cable fault point position. If the electromagnetic intensity difference is less than or equal to the electromagnetic intensity difference threshold, the suspected position of the cable fault point is not the cable fault point position, and a troubleshooting signal is generated. If the electromagnetic intensity at the suspected location of the cable fault point is less than or equal to the normal electromagnetic intensity, a troubleshooting signal is generated; Based on the troubleshooting signal, the electromagnetic intensity at different electromagnetic detection points on the cable fault detection section is obtained and compared with the normal electromagnetic intensity. If the electromagnetic intensity at the electromagnetic detection point is greater than the normal electromagnetic intensity and the electromagnetic intensity difference is greater than the electromagnetic intensity difference threshold, the electromagnetic detection point is marked as a cable fault point to be determined. Among the cable fault points to be determined, the cable fault point to be determined with the largest electromagnetic intensity is screened out, which is the cable fault point, and its position is the cable fault point position.

6. A cable fault precise positioning system according to claim 1, characterized in that: The process of accurately locating the cable fault by using the corrected electromagnetic data is as follows: Obtain the electromagnetic intensity at the suspected location of the cable fault point and the cable burial depth, multiply the cable burial depth by the mean of the variation ratio to obtain a correction value of the electromagnetic intensity at the suspected location of the cable fault point, sum the electromagnetic intensity at the suspected location of the cable fault point with the correction value of the electromagnetic intensity at the suspected location of the cable fault point, and obtain the actual electromagnetic intensity at the suspected location of the cable fault point; Obtain the electromagnetic strength and cable burial depth of each non-cable fault detection section, multiply the cable burial depth of the non-cable fault detection section by the mean value of the variation ratio to obtain the electromagnetic strength correction value of the non-cable fault detection section, sum the electromagnetic strength of the non-cable fault detection section with the electromagnetic strength correction value to obtain the actual electromagnetic strength of the non-cable fault detection section, sum and average the actual electromagnetic strengths of all non-cable fault detection sections to obtain the normal electromagnetic strength; The actual electromagnetic intensity at the suspected location of the cable fault point is compared and analyzed with the normal electromagnetic intensity to determine the location of the cable fault point.

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