Cable fault distance measurement method and device based on bandwidth quantization and generalized orthogonal integration

Abstract

The invention relates to a cable fault distance measurement method and device based on bandwidth quantization and generalized orthogonal integration, and the method comprises the steps: obtaining a cable head end reflection coefficient spectrum based on a phase shift parameter; according to the phase shift parameter-based cable head end reflection coefficient spectrum and an orthogonal integral principle, constructing a fault distance measurement function, and based on a preset constraint condition, constraining curve characteristics of the fault distance measurement function to obtain a sweep frequency bandwidth quantization relation; and obtaining a cable fault distance result based on the sweep frequency bandwidth quantization relation and the fault distance measurement function, thereby solving the problem of low fault distance measurement efficiency caused by the characteristics of overlarge sweep frequency bandwidth and overhigh test frequency in related technologies, and improving the efficiency of cable fault distance measurement on the premise of ensuring the distance measurement precision.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and in particular to a cable fault location method and apparatus based on bandwidth quantization and generalized orthogonal integral. Background Technology

[0002] With the acceleration of urbanization, power cables have become the main transmission carrier of urban power distribution networks due to their strong concealment and high reliability. Cable fault location technology is an important guarantee for the safe operation and efficient maintenance of power systems. The complex underground laying environment makes cables susceptible to external damage, insulation aging, joint defects and other factors, resulting in frequent faults. Therefore, it is necessary to locate and locate faults.

[0003] In related technologies, the frequency domain reflection cable fault location method based on the reflection coefficient spectrum is usually adopted. By inputting a wideband sweep frequency signal, and combining the sweep frequency bandwidth selected by the staff based on experience, cable fault location can be achieved.

[0004] However, the high frequency sweep bandwidth and high test frequency in related technologies result in low fault location efficiency, which urgently needs to be addressed. Summary of the Invention

[0005] This invention provides a cable fault location method and apparatus based on bandwidth quantization and generalized orthogonal integration to solve the problem of low fault location efficiency caused by excessive sweep bandwidth and high test frequency in related technologies. It improves the efficiency of cable fault location while ensuring location accuracy.

[0006] The first aspect of this invention provides a cable fault location method based on bandwidth quantization and generalized orthogonal integration, comprising the following steps: obtaining the reflection coefficient spectrum of the cable head end based on phase shift parameters; constructing a fault location function based on the reflection coefficient spectrum of the cable head end based on phase shift parameters and the orthogonal integration principle, and constraining the curve characteristics of the fault location function based on pre-set constraints to obtain a swept-frequency bandwidth quantization relationship; and obtaining the cable fault distance result based on the swept-frequency bandwidth quantization relationship and the fault location function.

[0007] Furthermore, in some embodiments, obtaining the cable head reflection coefficient spectrum based on the phase shift parameter includes: inputting a frequency sweep signal at the cable head to obtain a frequency-based cable head reflection coefficient spectrum; and rewriting the frequency-based cable head reflection coefficient spectrum according to the relationship between the phase shift parameter and the frequency to obtain the cable head reflection coefficient spectrum based on the phase shift parameter.

[0008] Furthermore, in some embodiments, the step of constraining the curve characteristics of the fault ranging function based on pre-set constraints to obtain the sweep bandwidth quantization relationship includes: obtaining the sidelobe extrema, main peak amplitude, and curve endpoint values ​​of the fault ranging function; and obtaining the sweep bandwidth quantization relationship between the sweep upper limit and the fault shielding distance based on the constraint relationship between the sidelobe extrema and the main peak amplitude and the constraint relationship between the curve endpoint values ​​and the main peak amplitude.

[0009] Furthermore, in some embodiments, obtaining the cable fault distance result based on the sweep frequency bandwidth quantization relationship and the fault location function includes: determining the sweep frequency signal range according to the sweep frequency bandwidth quantization relationship; and obtaining the cable fault distance result according to the sweep frequency signal range.

[0010] Furthermore, in some embodiments, obtaining the cable fault distance result based on the frequency sweep signal range includes: determining whether a preset fault location function has a preset abrupt change peak based on the frequency sweep signal range; and if the preset fault location function has the preset abrupt change peak, obtaining the integral result corresponding to the preset abrupt change peak to obtain the cable fault distance result.

[0011] The cable fault location method based on bandwidth quantization and generalized orthogonal integration provided by the present invention obtains the reflection coefficient spectrum of the cable head end based on phase shift parameters, constructs a fault location function by combining the orthogonal integration principle, obtains the sweep bandwidth quantization relationship by constraining the curve characteristics of the function according to preset constraints, and finally obtains the cable fault distance result based on the quantization relationship and the fault location function. This method solves the problem of low fault location efficiency caused by excessive sweep bandwidth and excessively high test frequency in related technologies, and improves the efficiency of cable fault location while ensuring the accuracy of the location.

[0012] A second aspect of the present invention provides a cable fault location device based on bandwidth quantization and generalized orthogonal integration. The device includes: an acquisition module for acquiring the reflection coefficient spectrum of the cable head end based on phase shift parameters; a construction module for constructing a fault location function based on the reflection coefficient spectrum of the cable head end based on phase shift parameters and the orthogonal integration principle, and constraining the curve characteristics of the fault location function based on pre-set constraints to obtain a swept-frequency bandwidth quantization relationship; and a calculation module for obtaining the cable fault distance result based on the swept-frequency bandwidth quantization relationship and the fault location function.

[0013] Furthermore, in some embodiments, the acquisition module is specifically used to: input a sweep frequency signal at the cable head end to acquire a frequency-based cable head end reflection coefficient spectrum; and rewrite the frequency-based cable head end reflection coefficient spectrum according to the relationship between the phase shift parameter and the frequency to obtain the phase shift parameter-based cable head end reflection coefficient spectrum.

[0014] Furthermore, in some embodiments, the construction module is specifically used to: obtain the sidelobe extrema, main peak amplitude, and curve endpoint values ​​of the fault ranging function; and obtain the sweep frequency bandwidth quantization relationship between the sweep frequency upper limit and the fault shielding distance based on the constraint relationship between the sidelobe extrema and the main peak amplitude and the constraint relationship between the curve endpoint values ​​and the main peak amplitude.

[0015] Furthermore, in some embodiments, the calculation module is specifically used to include: determining the sweep frequency signal range based on the sweep frequency bandwidth quantization relationship; and obtaining the cable fault distance result based on the sweep frequency signal range.

[0016] Furthermore, in some embodiments, the calculation module is also used to: determine whether a preset fault location function has a preset abrupt change peak based on the frequency sweep signal range; and if the preset fault location function has the preset abrupt change peak, obtain the integral result corresponding to the preset abrupt change peak to obtain the cable fault distance result.

[0017] The cable fault location device based on bandwidth quantization and generalized orthogonal integration provided by the present invention acquires the reflection coefficient spectrum of the cable head end based on phase shift parameters, constructs a fault location function by combining the orthogonal integration principle, obtains the sweep bandwidth quantization relationship by constraining the curve characteristics of the function according to preset constraints, and finally obtains the cable fault distance result based on the quantization relationship and the fault location function. This solves the problem of low fault location efficiency caused by excessive sweep bandwidth and excessively high test frequency in related technologies, and improves the efficiency of cable fault location while ensuring the location accuracy.

[0018] A third aspect of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the cable fault location method based on bandwidth quantization and generalized orthogonal integral described in the above embodiments.

[0019] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the cable fault location method based on bandwidth quantization and generalized orthogonal integral as described in the above embodiments.

[0020] A fifth aspect of the present invention provides a computer program product, including a computer program that is executed to implement the cable fault location method based on bandwidth quantization and generalized orthogonal integral as described in the above embodiments.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 A flowchart of a cable fault location method based on bandwidth quantization and generalized orthogonal integral provided according to an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the reflection coefficient spectrum at the cable head end based on phase shift parameters according to a specific embodiment of the present invention;

[0025] Figure 3 A schematic diagram of cable structure parameters provided according to a specific embodiment of the present invention;

[0026] Figure 4 A single-point fault location map provided according to a specific embodiment of the present invention;

[0027] Figure 5 This is another single-point fault location map provided according to a specific embodiment of the present invention;

[0028] Figure 6 A multi-point fault location map provided according to a specific embodiment of the present invention;

[0029] Figure 7 A flowchart of a cable fault location method based on bandwidth quantization and generalized orthogonal integral provided according to a specific embodiment of the present invention;

[0030] Figure 8 This is a block diagram of a cable fault detection device based on bandwidth quantization and generalized orthogonal integral provided according to an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] The cable fault location method and apparatus based on bandwidth quantization and generalized orthogonal integration according to embodiments of the present invention are described below with reference to the accompanying drawings. Addressing the problem of low fault location efficiency in related technologies mentioned in the background section due to excessively large sweep bandwidth and high test frequency, the present invention provides a cable fault location method based on bandwidth quantization and generalized orthogonal integration. This method obtains the reflection coefficient spectrum of the cable head end based on phase shift parameters, constructs a fault location function using the orthogonal integration principle, and obtains the sweep bandwidth quantization relationship by constraining the curve characteristics of this function according to preset constraints. Finally, based on the quantization relationship and the fault location function, the cable fault distance is obtained. This solves the problem of low fault location efficiency caused by excessively large sweep bandwidth and high test frequency in related technologies, improving the efficiency of cable fault location while ensuring location accuracy.

[0034] Specifically, Figure 1 This is a flowchart of a cable fault location method based on bandwidth quantization and generalized orthogonal integral provided according to an embodiment of the present invention.

[0035] like Figure 1 As shown, this cable fault location method based on bandwidth quantization and generalized orthogonal integral includes the following steps:

[0036] In step S101, the reflection coefficient spectrum of the cable head end based on the phase shift parameter is obtained.

[0037] Among them, the phase shift parameter refers to the phase change per unit length when the electromagnetic wave propagates in the cable, the cable head end refers to the end in the power cable line that is directly connected to the test equipment or power system, and the cable head end reflection coefficient spectrum is used to reflect the relationship between the reflected signal and the incident signal at the cable head end.

[0038] Furthermore, in some embodiments, obtaining the cable head reflection coefficient spectrum based on the phase shift parameter includes: inputting a frequency sweep signal at the cable head to obtain a frequency-based cable head reflection coefficient spectrum; and rewriting the frequency-based cable head reflection coefficient spectrum according to the relationship between the phase shift parameter and the frequency to obtain the cable head reflection coefficient spectrum based on the phase shift parameter.

[0039] Among them, the frequency-based cable head reflection coefficient spectrum refers to the relationship curve of the amplitude and phase ratio of the reflected signal and the incident signal versus frequency when different frequency sweep signals are injected into the cable head in cable fault detection.

[0040] It should be noted that the phase shift parameter in the cable head reflection coefficient spectrum based on the phase shift parameter can be directly related to the cable fault distance. Furthermore, in the phase shift domain, broadband redundancy can be avoided by bandwidth quantization. Therefore, it is necessary to rewrite the frequency-based cable head reflection coefficient spectrum into a cable head reflection coefficient spectrum based on the phase shift parameter.

[0041] Specifically, a sweep frequency signal is input at the cable head end. The signal at each frequency point propagates in the cable and is reflected when it encounters an impedance mismatch point (such as a fault point). The complex ratio of the reflected signal to the incident signal at the head end is measured synchronously to obtain the reflection coefficient at each frequency point, thus obtaining the frequency-based cable head end reflection coefficient spectrum. Based on the mathematical relationship between frequency and phase shift parameter, the frequency-based cable head end reflection coefficient spectrum is expressed using phase shift parameter to obtain the phase shift parameter-based cable head end reflection coefficient spectrum.

[0042] For example, by injecting a swept-frequency signal into the cable end using testing equipment, the relationship between the reflection coefficient spectrum Γ(f) of the cable end containing the fault and the signal frequency f is measured:

[0043]

[0044] Secondly, by using the mathematical relationship between the phase shift constant β and the frequency f, the traditional front-end reflection coefficient spectrum is transformed into Γ(β):

[0045]

[0046] Among them, Z L Z0 is the load, Z0 is the characteristic impedance of the cable, l F Where α is the cable fault distance and α is the attenuation factor.

[0047] Figure 2 This is a schematic diagram of the reflection coefficient spectrum at the cable head end based on phase shift parameters according to a specific embodiment of the present invention, as shown below. Figure 2 As shown, the horizontal axis is the phase shift constant, the vertical axis is the reflection coefficient, and the oscillation period Δβ satisfies 2Δβx=2π, where the phase difference 2π corresponds to one period, i.e. x=π / Δβ. The fault distance can be deduced from the period to locate the fault.

[0048] In step S102, a fault location function is constructed based on the reflection coefficient spectrum of the cable head end based on the phase shift parameter and the orthogonal integration principle. Based on the pre-set constraints, the curve characteristics of the fault location function are constrained to obtain the sweep bandwidth quantization relationship.

[0049] Among them, the orthogonal integral principle means that the product of trigonometric functions at different frequencies is zero when integrated over a specific interval, and significant when integrated at the same frequency. The sweep frequency bandwidth quantization relationship refers to the criterion used in cable fault location to clarify the quantitative relationship between the frequency range of the sweep frequency signal and the fault detection-related parameters.

[0050] Specifically, based on the reflection coefficient spectrum of the cable head end based on the phase shift parameter and the orthogonal integral principle, the correlation between the oscillation in the reflection coefficient spectrum and the fault distance is used to construct the fault location function using the cosine function in the reflection coefficient spectrum. The peak value can accurately correspond to the fault distance. Subsequently, considering the physical and mathematical constraints such as the cable fault shielding distance, the side lobe and main lobe width of the location function, the influence of the sweep frequency bandwidth on the shape of the location function (e.g., main lobe and side lobe) is analyzed, and the minimum value of the sweep frequency bandwidth is obtained by reverse calculation, thereby forming the sweep frequency bandwidth quantization relationship.

[0051] For example, based on the principle of orthogonal trigonometric systems, the characteristic that the integral results of two orthogonal functions differ significantly under different integrals, and the feature that the reflection coefficient spectrum curve Γ(β) at the cable head contains a cosine function, a fault location function can be constructed:

[0052]

[0053] K(x) = cos(2x × β)

[0054] Where F(x) is the distance measurement function obtained by multiplying two cosine functions, and β max and β min These are the upper and lower limits of the sweep frequency signal frequency corresponding to the upper and lower limits of the integration interval, respectively, and K(x) is the constructed kernel function.

[0055] Furthermore, in some embodiments, based on pre-set constraints, the curve characteristics of the fault location function are constrained to obtain the sweep bandwidth quantization relationship, including: obtaining the sidelobe extrema, main peak amplitude, and curve endpoint values ​​of the fault location function; and obtaining the sweep bandwidth quantization relationship between the sweep upper limit and the fault shielding distance based on the constraint relationship between the sidelobe extrema and the main peak amplitude and the constraint relationship between the curve endpoint values ​​and the main peak amplitude.

[0056] Among them, the main peak amplitude refers to the peak value obtained by the fault location function when the distance is equal to the actual fault distance of the cable, that is, the amplitude of the largest peak value representing the real fault location in the curve. The side lobe extreme value refers to the maximum value among the smaller peak values ​​in the fault location function curve other than the main peak representing the fault location. The values ​​at both ends of the curve refer to the values ​​of the fault location function curve at the endpoints of the integration interval.

[0057] Specifically, a certain proportion of the sidelobe extrema is set to be less than or equal to the amplitude of the main peak to ensure that the sidelobes do not obscure the main peak or are misjudged as new faults. At the same time, a certain proportion of the values ​​at both ends of the curve are set to be less than or equal to the amplitude of the main peak to avoid edge effects interfering with fault identification. This yields the constraint equation. Secondly, since the upper limit of the frequency sweep directly affects the curve shape of the fault ranging function, it is necessary to establish a mathematical expression between the minimum value of the upper limit of the frequency sweep and the fault masking distance when the constraint conditions are met. Finally, the frequency sweep bandwidth quantization relationship between the upper limit of the frequency sweep and the fault masking distance is obtained.

[0058] It should be noted that the upper and lower limits of the integral of the fault ranging function are directly related to the ranging accuracy of the guzheng. While ensuring ranging accuracy, the requirements of the frequency sweeping equipment can be reduced by optimizing the integral interval through calculation.

[0059] For example, by expanding and analyzing the fault location function, we can obtain:

[0060]

[0061] When β min When the value is 0, the average value of the attenuation factor α over the integration interval is taken as a constant, and the fault location function is:

[0062]

[0063] Furthermore, by setting constraints that the extreme values ​​of the side lobes around the abrupt change peak cannot exceed half the amplitude of the abrupt change peak (i.e., the amplitude of the main peak), and that the values ​​at the two endpoints of the ranging curve cannot exceed half the amplitude of the abrupt change peak, the upper limit β of the frequency sweep is derived. max The relationship that satisfies this is:

[0064] 8sin(2l F β max ()sin(4l F β max () Fmax ))

[0065] Secondly, by setting the intermediate variable y, we can obtain:

[0066]

[0067] Solving the function y>0, we get t>2.6, then the upper limit of the sweep frequency β is... max for:

[0068]

[0069] Among them, l s This is the fault masking distance, meaning that when the actual fault distance is less than this distance, the ranging system enters a dead zone. β max This is the upper limit of the frequency sweep, therefore, when β is given maxIt can be determined at that time l s Similarly, given l s β can be determined at that time. max .

[0070] As one possible way to achieve this, Figure 3 The present invention provides a schematic diagram of cable structure parameters according to a specific embodiment of the present invention. Based on the quantization relationship between the upper limit of the sweep frequency and the fault shielding distance, the sweep frequency bandwidth at different distances and the start and end points of the sweep frequency are calculated by substituting different fault shielding distances. Table 1 is a sweep frequency bandwidth quantization table provided according to a specific embodiment of the present invention. As shown in Table 1, when the given distance shielding distance is 50m, the sweep frequency bandwidth range can be obtained as 0.01MHz~0.76MHz, and the upper limit of the sweep frequency is 0.76MHz.

[0071] Table 1

[0072]

[0073] In step S103, the cable fault distance result is obtained based on the sweep frequency bandwidth quantization relationship and the fault location function.

[0074] The cable fault distance result refers to the specific value obtained by calculating the distance between the fault point in the cable and the detection end (i.e., the beginning of the cable) using a specific detection method.

[0075] Furthermore, in some embodiments, the cable fault distance result is obtained based on the sweep frequency bandwidth quantization relationship and the fault location function, including: determining the sweep frequency signal range according to the sweep frequency bandwidth quantization relationship; and obtaining the cable fault distance result according to the sweep frequency signal range.

[0076] For example, by setting the frequency sweep interval to 0.01MHz, 76 data points can be obtained by sampling. Single-point grounding faults of 50, 100, 200, 300, 400, 500, 1000, and 1200 meters are set respectively. Table 2 is a schematic table of grounding fault ranging results provided according to a specific embodiment of the present invention. As shown in Table 2, by substituting the frequency sweep bandwidth quantization relationship into the fault ranging function that determines the frequency sweep range, the error of the single-point grounding fault ranging result obtained according to the frequency sweep signal range can be controlled within a very small range.

[0077] Table 2

[0078] Sample number Defect distance / m Test distance / m absolute error 1 50 54 4 2 100 99 1 3 200 199 1 4 300 302 2 5 400 401 1 6 500 498 2 7 1000 999 1 8 1200 1201 1

[0079] Furthermore, in some embodiments, obtaining the cable fault distance result based on the frequency sweep signal range includes: determining whether a preset fault location function has a preset abrupt change peak based on the frequency sweep signal range; and if the preset fault location function has a preset abrupt change peak, obtaining the integral result corresponding to the preset abrupt change peak to obtain the cable fault distance result.

[0080] Among them, the preset mutation peak refers to the significant peak value that appears due to the same frequency superposition effect of orthogonal integrals when the variable in the fault location function is equal to the actual fault distance. In the fault location function, the horizontal axis coordinate corresponding to the preset mutation peak is the distance value when the integral result reaches the maximum value. This value corresponds strictly to the actual fault distance due to the same frequency enhancement characteristic of orthogonal integrals.

[0081] For example, for all β values ​​within the sweep frequency range, calculate the integral result F(x) corresponding to different x values, plot the complete ranging function curve, and then identify the curve that meets the preset constraints, such as the extreme values ​​of the side lobes around the sudden peak not being greater than 1 / 2 of the amplitude of the sudden peak (i.e., the amplitude of the main peak), and the constraints that the two endpoint values ​​of the ranging curve not being greater than 1 / 2 of the amplitude of the sudden peak. Read the horizontal axis coordinate x0 corresponding to the sudden peak, which is the cable fault distance result.

[0082] further, Figure 4 This is a single-point fault location map provided according to a specific embodiment of the present invention. Figure 5 This is another single-point fault location map provided according to a specific embodiment of the present invention. Figure 6 This is a multi-point fault location map provided according to a specific embodiment of the present invention.

[0083] like Figure 4 and Figure 5 As shown, the most prominent peak in each curve, such as x=57 for a 50m cable and x=194 for a 200m cable, is the result of orthogonal integral frequency amplification. That is, assuming the distance x matches the actual fault distance, the integral result is significantly amplified, forming a peak. The smaller peaks outside the main peak are unmatched frequency interferences, with amplitudes much lower than the main peak, i.e., sidelobes, which do not affect fault diagnosis. Figure 6 As shown, the main peak x = 247 is the most significant peak, the secondary peak x = 1048m is the secondary peak with an amplitude lower than the main peak, and the side lobes are the small oscillations outside the main peak and secondary peak, which can clearly reflect the curve characteristics formed by multi-point faults.

[0084] To enable those skilled in the art to better understand the cable fault location method based on bandwidth quantization and generalized orthogonal integral of the present invention, the following explanation will be provided in conjunction with specific embodiments.

[0085] Figure 7A flowchart of a cable fault location method based on bandwidth quantization and generalized orthogonal integral according to a specific embodiment of the present invention is shown below. Figure 7 As shown, firstly, the frequency range of the sweep signal is set to determine the frequency coverage of subsequent signal acquisition. Secondly, the sweep signal is injected into the cable head end according to the bandwidth range set in the first step, and the incident and reflected signals at the head end are acquired simultaneously. Then, the acquired raw signals are subjected to "denoising, calibration, and format conversion" to output a clean "incident-reflection signal pair". The reflection coefficient at different frequencies is calculated to construct the "frequency-reflection coefficient" spectrum curve. Finally, the "reflection coefficient spectrum is converted into the phase shift domain to construct the fault location function and finally output the fault distance. Thus, the accurate location of the fault is achieved.

[0086] The cable fault location method based on bandwidth quantization and generalized orthogonal integration provided by the present invention obtains the reflection coefficient spectrum of the cable head end based on phase shift parameters, constructs a fault location function by combining the orthogonal integration principle, obtains the sweep bandwidth quantization relationship by constraining the curve characteristics of the function according to preset constraints, and finally obtains the cable fault distance result based on the quantization relationship and the fault location function. This method solves the problem of low fault location efficiency caused by excessive sweep bandwidth and excessively high test frequency in related technologies, and improves the efficiency of cable fault location while ensuring the accuracy of the location.

[0087] Next, referring to the accompanying drawings, a cable fault location device based on bandwidth quantization and generalized orthogonal integral provided in an embodiment of the present invention is described.

[0088] Figure 8 This is a block diagram of a cable fault detection device based on bandwidth quantization and generalized orthogonal integral provided according to an embodiment of the present invention.

[0089] like Figure 8 As shown, the cable fault location device 10 based on bandwidth quantization and generalized orthogonal integration includes: an acquisition module 100, a construction module 200, and a calculation module 300.

[0090] The acquisition module 100 is used to acquire the reflection coefficient spectrum of the cable head end based on the phase shift parameter; the construction module 200 is used to construct the fault location function based on the reflection coefficient spectrum of the cable head end based on the phase shift parameter and the orthogonal integration principle, and to constrain the curve characteristics of the fault location function based on the pre-set constraints to obtain the sweep frequency bandwidth quantization relationship; the calculation module 300 is used to obtain the cable fault distance result based on the sweep frequency bandwidth quantization relationship and the fault location function.

[0091] Furthermore, in some embodiments, the acquisition module 100 is specifically used to: input a sweep frequency signal at the cable head end to acquire a frequency-based cable head end reflection coefficient spectrum; and rewrite the frequency-based cable head end reflection coefficient spectrum according to the relationship between the phase shift parameter and the frequency to obtain a cable head end reflection coefficient spectrum based on the phase shift parameter.

[0092] Furthermore, in some embodiments, the construction module 200 is specifically used to: obtain the sidelobe extrema, main peak amplitude, and curve endpoint values ​​of the fault ranging function; and obtain the sweep frequency bandwidth quantization relationship between the sweep frequency upper limit and the fault shielding distance based on the constraint relationship between the sidelobe extrema and the main peak amplitude and the constraint relationship between the curve endpoint values ​​and the main peak amplitude.

[0093] Furthermore, in some embodiments, the calculation module 300 is specifically used for: determining the sweep frequency signal range based on the sweep frequency bandwidth quantization relationship; and obtaining the cable fault distance result based on the sweep frequency signal range.

[0094] Furthermore, in some embodiments, the calculation module 300 is also used to: determine whether there is a preset sudden peak in the preset fault location function based on the frequency sweep signal range; and if there is a preset sudden peak in the preset fault location function, obtain the integral result corresponding to the preset sudden peak to obtain the cable fault distance result.

[0095] It should be noted that the above explanation of the cable fault location method based on bandwidth quantization and generalized orthogonal integral also applies to the cable fault location device based on bandwidth quantization and generalized orthogonal integral in this embodiment, and will not be repeated here.

[0096] The cable fault location device based on bandwidth quantization and generalized orthogonal integration provided by the present invention acquires the reflection coefficient spectrum of the cable head end based on phase shift parameters, constructs a fault location function by combining the orthogonal integration principle, obtains the sweep bandwidth quantization relationship by constraining the curve characteristics of the function according to preset constraints, and finally obtains the cable fault distance result based on the quantization relationship and the fault location function. This solves the problem of low fault location efficiency caused by excessive sweep bandwidth and excessively high test frequency in related technologies, and improves the efficiency of cable fault location while ensuring the location accuracy.

[0097] Figure 9 This is a schematic diagram of an electronic device according to an embodiment of the present invention. The electronic device may include:

[0098] The memory 901, the processor 902, and the computer program stored on the memory 901 and capable of running on the processor 902.

[0099] When the processor 902 executes the program, it implements the cable fault location method based on bandwidth quantization and generalized orthogonal integral provided in the above embodiments.

[0100] Furthermore, the electronic device also includes:

[0101] Communication interface 903 is used for communication between memory 901 and processor 902.

[0102] The memory 901 is used to store computer programs that can run on the processor 902.

[0103] The memory 901 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0104] If the memory 901, processor 902, and communication interface 903 are implemented independently, then the communication interface 903, memory 901, and processor 902 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 9 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0105] Optionally, in a specific implementation, if the memory 801, processor 802, and communication interface 803 are integrated on a single chip, then the memory 801, processor 802, and communication interface 803 can communicate with each other through an internal interface.

[0106] The processor 902 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

[0107] In addition, embodiments of the present invention also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described cable fault location method based on bandwidth quantization and generalized orthogonal integral.

[0108] In addition, embodiments of the present invention also provide a computer program product, including a computer program, which is executed to implement the above-mentioned cable fault location method based on bandwidth quantization and generalized orthogonal integral.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0110] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0111] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of the invention pertain.

[0112] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0113] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it includes one or a combination of the steps of the method embodiments.

Claims

1. A cable fault location method based on bandwidth quantization and generalized orthogonal integral, characterized in that, Includes the following steps: Obtain the reflection coefficient spectrum at the cable head end based on phase shift parameters; Based on the cable head-end reflection coefficient spectrum based on phase shift parameters and the orthogonal integration principle, a fault location function is constructed, and based on pre-set constraints, the curve characteristics of the fault location function are constrained to obtain the sweep bandwidth quantization relationship. Based on the frequency sweep bandwidth quantization relationship and the fault location function, the cable fault distance result is obtained.

2. The method according to claim 1, characterized in that, The process of obtaining the reflection coefficient spectrum at the cable head end based on the phase shift parameter includes: A frequency sweep signal is input at the cable head end to obtain the frequency-based reflection coefficient spectrum of the cable head end; Based on the relationship between the phase shift parameter and the frequency, the frequency-based cable head reflection coefficient spectrum is rewritten to obtain the phase shift parameter-based cable head reflection coefficient spectrum.

3. The method according to claim 1, characterized in that, The step of constraining the curve characteristics of the fault ranging function based on pre-defined constraints to obtain the sweep bandwidth quantization relationship includes: Obtain the sidelobe extrema, main peak amplitude, and curve endpoints of the fault location function; The sweep bandwidth quantization relationship between the sweep frequency upper limit and the fault shielding distance is obtained based on the constraint relationship between the sidelobe extrema and the main peak amplitude, and the constraint relationship between the values ​​of the two endpoints of the curve and the main peak amplitude.

4. The method according to claim 1, characterized in that, The process of obtaining the cable fault distance result based on the sweep bandwidth quantization relationship and the fault location function includes: The sweep frequency signal range is determined based on the sweep frequency bandwidth quantization relationship. The cable fault distance result is obtained based on the range of the frequency sweep signal.

5. The method according to claim 4, characterized in that, The step of obtaining the cable fault distance result based on the frequency sweep signal range includes: Based on the frequency sweep signal range, determine whether the preset fault location function has a preset abrupt peak; If the preset fault location function has the preset abrupt change peak, the integral result corresponding to the preset abrupt change peak is obtained to obtain the cable fault distance result.

6. A cable fault location device based on bandwidth quantization and generalized orthogonal integral, characterized in that, The device includes: The acquisition module is used to acquire the reflection coefficient spectrum of the cable head end based on the phase shift parameter; The construction module is used to construct a fault location function based on the cable head-end reflection coefficient spectrum based on phase shift parameters and the orthogonal integration principle, and to constrain the curve characteristics of the fault location function based on pre-set constraints to obtain the sweep bandwidth quantization relationship. The calculation module is used to obtain the cable fault distance result based on the sweep frequency bandwidth quantization relationship and the fault location function.

7. The apparatus according to claim 6, characterized in that, The acquisition module is specifically used for: A frequency sweep signal is input at the cable head end to obtain the frequency-based reflection coefficient spectrum of the cable head end; Based on the relationship between the phase shift parameter and the frequency, the frequency-based cable head reflection coefficient spectrum is rewritten to obtain the phase shift parameter-based cable head reflection coefficient spectrum.

8. An electronic device, characterized in that, include: The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the cable fault location method based on bandwidth quantization and generalized orthogonal integral as described in any one of claims 1-5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the cable fault location method based on bandwidth quantization and generalized orthogonal integral as described in any one of claims 1-5.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the cable fault location method based on bandwidth quantization and generalized orthogonal integral as described in any one of claims 1-5.

Images