Power transmission line fault positioning method, device and equipment and readable storage medium

Abstract

A power transmission line fault location method, device and equipment and readable storage medium. The method comprises: acquiring a first time domain signal of a traveling wave collected by a first collection device and a second time domain signal of a traveling wave collected by a second collection device, wherein the first collection device and the second collection device are located on both sides of a fault point; converting the first time domain signal into a first frequency domain signal and the second time domain signal into a second frequency domain signal; obtaining a time difference of the traveling wave reaching the first collection device and the second collection device according to the first frequency domain signal and the second frequency domain signal; and performing fault location based on the time difference. Through the present application, the time when the traveling wave reaches the two devices is no longer calculated separately, but the time difference of the traveling wave reaching the two devices is directly calculated, avoiding the situation that the error of the power transmission line fault location result is amplified due to the calculation of two time points in the traditional method, improving the accuracy of the power transmission line fault location result, and having a larger application range.

Description

Technical Field

[0001] This application relates to the field of power technology, specifically to a method, apparatus, equipment, and computer-readable storage medium for locating faults in power transmission lines. Background Technology

[0002] Online monitoring and distributed fault location technology for power transmission lines has been widely applied in power transmission networks of various voltage levels across China. When a line is struck by lightning or experiences other types of faults, a traveling wave is generated at the fault point, propagating outwards at near the speed of light. By installing acquisition devices on the line to capture the traveling wave and record its precise arrival time, and then combining this with the known line length, the location of the fault point can be calculated.

[0003] Currently, the most widely used and technologically mature method in the field of traveling wave positioning is the two-end positioning method. (Refer to...) Figure 1 , Figure 1 This is a schematic diagram illustrating a scenario for traveling wave positioning based on the two-end positioning method. For example... Figure 1 As shown, the principle of this method is to acquire the traveling waves collected by the devices on both sides of the fault point, calculate the wavefront times t1 and t2 respectively as the arrival times of the traveling waves, and then use formula one or formula two to obtain the distance from the fault point to one side of the device. Formula one is:

[0004]

[0005] Formula 2 is:

[0006]

[0007] In the above formula, , These represent the times when the traveling wave arrives at the first and second devices, respectively. For wave speed, The distance between the two devices, , These are the distances from the fault point to the first and second devices, respectively.

[0008] Operational experience shows that the traditional two-end positioning method, when used on low-voltage lines (such as 35kV) or during high-resistance faults, suffers from increased noise and distortion in the acquired traveling waves due to the complexity of the fault process and the presence of significant environmental electromagnetic interference. This leads to larger errors in the calculation of the traveling wave arrival time. Assuming the calculated arrival time... t There is random error e It follows a normal distribution:

[0009]

[0010] In the formula, for evariance. According to Formula I / II, if the errors of the two arrival times , are independently and identically distributed, after subtraction, the errors are also normally distributed, that is:

[0011]

[0012] The variance of the normal distribution of the time difference is greater than the variance of the single arrival time, that is > This shows that the calculation principle of the traditional double-end positioning method amplifies the calculation error and reduces the positioning accuracy. SUMMARY

[0013] The present application provides a power transmission line fault positioning method, device, equipment and computer readable storage medium, which can solve the technical problem that the error of the power transmission line fault positioning result is amplified due to the independent determination of the arrival time of the traveling wave at the two devices.

[0014] In a first aspect, the embodiments of the present application provide a power transmission line fault positioning method, which comprises:

[0015] obtaining a first time domain signal of a traveling wave collected by a first collection device and a second time domain signal of a traveling wave collected by a second collection device, wherein the first collection device and the second collection device are located on both sides of the fault point;

[0016] converting the first time domain signal into a first frequency domain signal and converting the second time domain signal into a second frequency domain signal;

[0017] obtaining a time difference of the traveling wave arriving at the first collection device and the second collection device according to the first frequency domain signal and the second frequency domain signal;

[0018] performing fault positioning based on the time difference.

[0019] In combination with the first aspect, in an implementation manner, the obtaining of the time difference of the traveling wave arriving at the first collection device and the second collection device according to the first frequency domain signal and the second frequency domain signal comprises:

[0020] solving the minimum value of a preset function, wherein the preset function is:

[0021]

[0022] so that is the minimum value of as the time difference of the traveling wave arriving at the first collection device and the second collection device;

[0023] wherein:

[0024]

[0025]

[0026]

[0027]

[0028] the value range of [ is , ], , is the wave velocity, is the distance between the first acquisition device and the second acquisition device; is the sampling point number; is the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency variable, ; is the angle of a complex number; is the natural constant; is the modulus of a complex number; j is the complex unit, j 2 .

[0029] In combination with the first aspect, in an implementation mode, the time difference of the arrival of the traveling wave at the first acquisition device and the second acquisition device according to the first frequency domain signal and the second frequency domain signal comprises:

[0030] solving the minimum value of the preset function, the preset function is:

[0031]

[0032] so that is the minimum value of as the estimated time difference of the arrival of the traveling wave at the first acquisition device and the second acquisition device ;

[0033] wherein:

[0034]

[0035]

[0036]

[0037]

[0038] the value range of [ is , ], , is the wave velocity, is the distance between the first acquisition device and the second acquisition device; is the number of sampling points; is the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency variable, ; is the angle of a complex number; is the natural constant; is the modulus of a complex number; j is the complex unit, j 2 ;

[0039] The is corrected to obtain , which is the time difference of the arrival of the traveling wave at the first acquisition device and the second acquisition device.

[0040] In combination with the first aspect, in an implementation, the correction processing of the includes:

[0041] A first signal segment is obtained by intercepting a width of sampling points from the first time domain signal , and a second signal segment is obtained by intercepting a width of sampling points from the second time domain signal . , is the time variable, , wherein:

[0042]

[0043]

[0044] is the time at which the main wave peak of the first time domain signal is located, is the time length required at the traveling wave sampling rate ;

[0045] The cross-correlation signal of and is obtained by a cross-correlation signal solving formula, and the cross-correlation signal solving formula is as follows:

[0046]

[0047] , wherein: ;

[0048] The index that makes maximum is determinedm ;

[0049] Based on , and , the offset point number is obtained through interpolation processing.

[0050] Substitute , and into the correction formula to obtain , and the correction formula is as follows:

[0051] .

[0052] In combination with the first aspect, in an implementation mode, based on , and , the offset point number is obtained through interpolation processing, and the interpolation processing includes:

[0053] Substitute , and into the interpolation processing formula to obtain the offset point number , and the interpolation processing formula is as follows:

[0054] .

[0055] The second aspect, the embodiment of the application provides a kind of transmission line fault location device, and the transmission line fault location device includes:

[0056] Obtaining module, for obtaining the first time domain signal of the traveling wave collected by first acquisition device and the second time domain signal of the traveling wave collected by second acquisition device, wherein first acquisition device and second acquisition device are located on both sides of fault point respectively;

[0057] Conversion module, for converting first time domain signal into first frequency domain signal, and converting second time domain signal into second frequency domain signal;

[0058] Determination module, for obtaining the time difference of traveling wave reaching first acquisition device and second acquisition device according to first frequency domain signal and second frequency domain signal;

[0059] Positioning module, for fault location based on the time difference.

[0060] In combination with the second aspect, in an implementation mode, the determination module is used for:

[0061] Solving the minimum value of preset function, and the preset function is:

[0062]

[0063] such that is minimized is the time difference between the first acquisition device and the second acquisition device as the traveling wave arrives;

[0064] wherein:

[0065]

[0066]

[0067]

[0068]

[0069] the value range of , ], , is the wave speed, is the distance between the first acquisition device and the second acquisition device; is the number of sampling points; is the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency argument, ; is the angle of a complex number; is a natural constant; is the modulus of a complex number; j is the complex unit, j 2 .

[0070] In combination with the second aspect, in an implementation manner, the determining module is configured to:

[0071] solving the minimum value of the preset function, the preset function being:

[0072]

[0073] such that is minimized is the estimated time difference between the first acquisition device and the second acquisition device as the traveling wave arrives; ;

[0074] wherein:

[0075]

[0076]

[0077]

[0078]

[0079] the value range of [ is [ , ], , is the wave speed, is the distance between the first acquisition device and the second acquisition device; is the sampling point number; is the real part of the complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency variable, ; is the angle of the complex number; is the natural constant; is the modulus of the complex number; j is the complex number unit, j 2 ;

[0080] The correction processing is performed on the to obtain as the time difference of the arrival of the traveling wave at the first acquisition device and the second acquisition device.

[0081] In a third aspect, an embodiment of the present application provides a power transmission line fault positioning device, the power transmission line fault positioning device comprising a processor, a memory, and a power transmission line fault positioning program stored in the memory and executable by the processor, wherein the power transmission line fault positioning program, when executed by the processor, implements the steps of the power transmission line fault positioning method according to the first aspect.

[0082] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, the computer readable storage medium storing a power transmission line fault positioning program, wherein the power transmission line fault positioning program, when executed by a processor, implements the steps of the power transmission line fault positioning method according to the first aspect.

[0083] The technical scheme provided by the embodiment of the present application has the beneficial effects including:

[0084] In this embodiment, a first time-domain signal of a traveling wave acquired by a first acquisition device and a second time-domain signal of a traveling wave acquired by a second acquisition device are obtained, wherein the first and second acquisition devices are located on opposite sides of the fault point. The first time-domain signal is converted into a first frequency-domain signal, and the second time-domain signal is converted into a second frequency-domain signal. The time difference between the arrival times of the traveling wave at the first and second acquisition devices is obtained based on the first and second frequency-domain signals. Fault location is performed based on the time difference. This embodiment eliminates the need to calculate the arrival times of the traveling wave at both devices separately; instead, it directly uses the time difference between the two traveling waves to determine their arrival times. This avoids the amplification of errors in the fault location results caused by calculating two times separately in traditional methods, thus improving the accuracy of the fault location results and broadening its applicability. Attached Figure Description

[0085] Figure 1 This is a schematic diagram of a scenario for traveling wave positioning based on the dual-end positioning method;

[0086] Figure 2 This is a flowchart illustrating an embodiment of the transmission line fault location method of this application;

[0087] Figure 3 This is a schematic diagram of the functional modules of an embodiment of the transmission line fault location device of this application;

[0088] Figure 4 This is a schematic diagram of the hardware structure of the power transmission line fault location device involved in the embodiments of this application. Detailed Implementation

[0089] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0090] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0091] In a first aspect, embodiments of this application provide a method for locating faults in power transmission lines.

[0092] In one embodiment, reference is made to Figure 2 , Figure 2 This is a flowchart illustrating an embodiment of the transmission line fault location method of this application. Figure 2 As shown, the methods for locating faults in transmission lines include:

[0093] Step S10, obtaining a first time domain signal of the traveling wave collected by the first collecting device and a second time domain signal of the traveling wave collected by the second collecting device, wherein the first collecting device and the second collecting device are respectively located on two sides of the fault point;

[0094] Step S20, converting the first time domain signal into a first frequency domain signal and converting the second time domain signal into a second frequency domain signal;

[0095] In this embodiment, referring to the scenario shown in FIG. 1, the traveling wave generated at the fault point propagates to both sides at close to the speed of light, and the first collecting device and the second collecting device located on two sides of the fault point can collect the first time domain signal and the second time domain signal respectively. Figure 1 .

[0096] The FFT fast Fourier transform is performed on the first time domain signal and the second time domain signal respectively, so as to obtain the first frequency domain signal and the second frequency domain signal. Wherein, before the FFT is performed, the start point and the end point of the first time domain signal and the second time domain signal should be completely aligned, and represent the same absolute time stamp respectively. If the collecting methods of the first collecting device and the second collecting device are different, the inconsistent part should be cut to align the waveforms. is the time independent variable, ; is the frequency independent variable, ; is the number of sampling points.

[0097] Step S30, obtaining the time difference of the traveling wave reaching the first collecting device and the second collecting device according to the first frequency domain signal and the second frequency domain signal;

[0098] In this embodiment, the time difference of the traveling wave reaching the first collecting device and the second collecting device is determined based on the first frequency domain signal and the second frequency domain signal, and two schemes are provided. In one scheme, the estimated time difference is obtained, which can be used in the scene where the fault positioning accuracy is not high but the rapid positioning is required. In another scheme, the estimated time difference is first obtained, and then the estimated time difference is optimized to obtain the accurate time difference, which can be used in the scene where the fault positioning accuracy is high.

[0099] Further, in one embodiment, step S30 includes:

[0100] solving the minimum value of the preset function, and the preset function is:

[0101]

[0102] so that​​​​​​​​ minimum value As the time difference between the arrival of the traveling wave at the first and second acquisition devices;

[0103] in:

[0104]

[0105]

[0106]

[0107]

[0108] The range of values ​​for is [ , ], , For wave speed, The distance between the first and second data acquisition devices; This represents the number of sampling points; To find the real part of a complex number; For the first frequency domain signal, This is the second frequency domain signal. As the frequency independent variable, ; To find complex angles; It is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 .

[0109] In this embodiment, The frequency is The phase difference at time is calculated using the circular domain regression method. Convert to unit complex number Fitting a uniform rotational speed ( This avoids the distortion caused by directly linearly fitting the phase difference (because the phase is a periodic variable). The frequency is The amplitude spectrum at time, combined with the preset function, shows that, through corresponding right Weighting represents the combined time difference of multiple frequency components of the actual traveling wave, which is more in line with its physical nature.

[0110] Further, in one embodiment, step S30 includes:

[0111] Find the minimum value of a preset function, which is:

[0112]

[0113] such that is minimized as an estimated time difference of the traveling wave reaching the first acquisition device and the second acquisition device ;

[0114] wherein:

[0115]

[0116]

[0117]

[0118]

[0119] the value range of , ], , is a wave speed, is a distance between the first acquisition device and the second acquisition device; is a sampling point number; is a real part of a complex number; is a first frequency domain signal, is a second frequency domain signal, is a frequency independent variable, ; is an angle of a complex number; is a natural constant; is a modulus of a complex number; j is a complex number unit, j 2 ;

[0120] correcting the obtains as a time difference of the traveling wave reaching the first acquisition device and the second acquisition device.

[0121] In the embodiment, on the basis of obtaining , further correction processing obtains , and is taken as a time difference of the traveling wave reaching the first acquisition device and the second acquisition device, which effectively improves the accuracy of the fault location result of the power transmission line.

[0122] Further, in an embodiment, the correction processing on the includes:

[0123] cutting the first time domain signal to obtain a signal with a width of A first signal segment is obtained from the second time domain signal A second signal segment is obtained from the first time domain signal A second signal segment is obtained from the first time domain signal , is a time variable, ,

[0124]

[0125]

[0126] is a time variable, is a time variable, is a time variable, is a time variable,

[0127] is obtained by substituting the cross-correlation signal of and into the cross-correlation signal solving formula, and the cross-correlation signal solving formula is as follows:

[0128]

[0129] , ;

[0130] is obtained by determining the index that makes m maximum;

[0131] is obtained by substituting , and into the interpolation processing formula, and the interpolation processing formula is as follows:

[0132] is obtained by substituting , and into the correction formula, and the correction formula is as follows:

[0133] .

[0134] Further, in an embodiment, the offset point number is obtained by substituting , and into the interpolation processing formula, and the interpolation processing formula is as follows:

[0135] , and into the interpolation processing formula, and the interpolation processing formula is as follows: ​​​​

[0136] .

[0137] In this embodiment, based on the circular domain regression method and parabolic interpolation, the accurate time difference of the traveling wave at both ends of the transmission line is obtained by using the amplitude spectrum-weighted signal frequency domain phase difference, which avoids the problem of error amplification caused by calculating the time point of each traveling wave head separately in the traditional method.

[0138] Step S40: Fault location is performed based on the time difference.

[0139] In this embodiment, based on the time difference, the distance from the fault point to the two acquisition devices on both sides can be determined by combining the distance calculation formula of the fault point to the two acquisition devices on both sides in the traditional dual-end positioning method, thus realizing fault location.

[0140] In this embodiment, a first time-domain signal of a traveling wave acquired by a first acquisition device and a second time-domain signal of a traveling wave acquired by a second acquisition device are obtained, wherein the first and second acquisition devices are located on opposite sides of the fault point. The first time-domain signal is converted into a first frequency-domain signal, and the second time-domain signal is converted into a second frequency-domain signal. The time difference between the arrival times of the traveling wave at the first and second acquisition devices is obtained based on the first and second frequency-domain signals. Fault location is performed based on the time difference. This embodiment eliminates the need to calculate the arrival times of the traveling wave at both devices separately; instead, it directly uses the time difference between the two traveling waves to determine their arrival times. This avoids the amplification of errors in the fault location results caused by calculating two times separately in traditional methods, thus improving the accuracy of the fault location results and broadening its applicability.

[0141] Secondly, embodiments of this application also provide a power transmission line fault location device.

[0142] In one embodiment, reference is made to Figure 3 , Figure 3 This is a functional module diagram of an embodiment of the transmission line fault location device of this application. Figure 3 As shown, the transmission line fault location device includes:

[0143] The acquisition module 10 is used to acquire the first time-domain signal of the traveling wave acquired by the first acquisition device and the second time-domain signal of the traveling wave acquired by the second acquisition device, wherein the first acquisition device and the second acquisition device are located on both sides of the fault point.

[0144] Conversion module 20 is used to convert a first time-domain signal into a first frequency-domain signal and a second time-domain signal into a second frequency-domain signal;

[0145] The determining module 30 is used to obtain the time difference between the arrival of the traveling wave at the first acquisition device and the second acquisition device based on the first frequency domain signal and the second frequency domain signal.

[0146] locating module 40 is configured to locate the fault based on the time difference.

[0147] Further, in an embodiment, the determining module 30 is configured to:

[0148] solving a minimum value of a preset function, the preset function being:

[0149]

[0150] such that is a minimum value of as a time difference of the traveling wave reaching the first collecting device and the second collecting device;

[0151] wherein:

[0152]

[0153]

[0154]

[0155]

[0156] a value range of , ], , is a wave speed, is a distance between the first collecting device and the second collecting device; is a sampling point number; is a real part of a complex number; is a first frequency domain signal, is a second frequency domain signal, is a frequency independent variable, ; is an angle of a complex number; is a natural constant; is a modulus of a complex number; j is a complex number unit, j 2 .

[0157] Further, in an embodiment, the determining module 30 is configured to:

[0158] solving a minimum value of a preset function, the preset function being:

[0159]

[0160] such that is a minimum value of as an estimated time difference of the traveling wave reaching the first collecting device and the second collecting device ;

[0161] wherein:

[0162]

[0163]

[0164]

[0165]

[0166] the value range of , ], , is the wave speed, is the distance between the first acquisition device and the second acquisition device; is the sampling point number; is the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency variable, ; is the angle of a complex number; is the natural constant; is the modulus of a complex number; j is the complex number unit, j 2 ;

[0167] correcting the to obtain as the time difference of the arrival of the traveling wave at the first acquisition device and the second acquisition device.

[0168] Further, in an embodiment, the determination module 30 is configured to:

[0169] cut the first time domain signal to obtain a first signal segment with a width of sampling points, and cut the second time domain signal to obtain a second signal segment with a width of sampling points , is the time variable, wherein:

[0170]

[0171]

[0172] is the time at which the main wave peak of the first time domain signal is located, time length required points under the sampling rate of the traveling wave;

[0173] by the cross-correlation signal solving formula and the cross-correlation signal, and the cross-correlation signal solving formula is as follows:

[0174]

[0175] wherein, ;

[0176] determining the index that makes the maximum value m ;

[0177] based on , and , the offset point number is obtained through interpolation processing;

[0178] substituting , and into the correction formula, the offset point number is obtained, and the correction formula is as follows:

[0179] .

[0180] Further, in an embodiment, the determining module 30 is configured to:

[0181] substituting , and into the interpolation processing formula, the offset point number is obtained, and the interpolation processing formula is as follows:

[0182] .

[0183] Wherein, the function implementation of each module in the above power line fault positioning device corresponds to each step in the above power line fault positioning method embodiment, and the functions and implementation processes will not be repeated here.

[0184] In a third aspect, the embodiments of the present application provide a power line fault positioning device. The power line fault positioning device can be a personal computer (PC), a notebook computer, a server, or other devices with data processing functions.

[0185] Referring to Figure 4 , Figure 4 ​Fig. 1 is a schematic diagram of a hardware structure of a power transmission line fault locating device according to an embodiment of the present application. In the embodiment of the present application, the power transmission line fault locating device can include a processor, a memory, a communication interface, and a communication bus.

[0186] The communication bus can be of any type, for interconnecting the processor, the memory, and the communication interface.

[0187] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, and the like, which are used to interconnect devices inside the power transmission line fault locating device, and are used to interconnect the power transmission line fault locating device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber interface, an ATM interface, and the like; the user device can be a display (Display), a keyboard (Keyboard), and the like.

[0188] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), and the like.

[0189] The processor can be a general-purpose processor, which can invoke a power transmission line fault locating program stored in the memory and execute the power transmission line fault locating method provided by the embodiment of the present application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed by the power transmission line fault locating program when invoked can refer to each embodiment of the power transmission line fault locating method of the present application, which will not be described here.

[0190] Those skilled in the art can understand that the hardware structure shown in Fig. 1 does not constitute a limitation on the present application, and can include more or fewer components than those shown, or combine certain components, or different component arrangements. Figure 4

[0191] In a fourth aspect, the embodiment of the present application further provides a computer readable storage medium.

[0192] ​The computer readable storage medium stores a power transmission line fault locating program, wherein the power transmission line fault locating program, when executed by a processor, implements the steps of the power transmission line fault locating method.

[0193] The method implemented when the power transmission line fault locating program is executed can refer to each embodiment of the power transmission line fault locating method of the present application, which will not be described herein.

[0194] It should be noted that the above-mentioned sequence numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0195] The terms "comprising" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device. The terms "first", "second" and "third" and the like descriptions are used to distinguish different objects, and do not represent the order or limit the types of "first", "second" and "third".

[0196] In the description of the embodiments of the present application, "exemplary", "for example", "for instance" or the like is used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplary", "for example" or "for instance" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. On the contrary, the words "exemplary", "for example", "for instance" or the like are intended to present the relevant concept in a specific manner.

[0197] In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; "and / or" in the text only represents the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A alone, A and B together, B alone, in addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0198] In some of the processes described in the embodiments of the present application, a plurality of operations or steps are included in a specific order, but it should be understood that these operations or steps can be executed or executed in parallel without the order in which they appear in the embodiments of the present application, and the serial number of the operation is only used to distinguish each different operation, and the serial number itself does not represent any execution order. In addition, these processes can include more or fewer operations, and these operations or steps can be executed in sequence or in parallel, and these operations or steps can be combined.

[0199] Those skilled in the art can clearly understand the above-mentioned embodiment method can be realized by means of software and the necessary general hardware platform, of course, can also be through hardware, but in many cases the former is a better implementation. Based on such understanding, the technical solutions of the present application essentially or say the part of the prior art contribution can be embodied in the form of software products, the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disc, optical disc) as described above, including a number of instructions to make a terminal device execute the method described in various embodiments of the present application.

[0200] The above is only the preferred embodiment of the present application, not therefore limit the patent scope of the present application, all use the contents of the present application specification and drawings to make equivalent structure or equivalent process transformation, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method of fault location for a power transmission line, characterized in that, The power transmission line fault positioning method comprises: acquiring a first time domain signal of the traveling wave collected by a first collecting device and a second time domain signal of the traveling wave collected by a second collecting device, wherein the first collecting device and the second collecting device are located on two sides of the fault point respectively; converting the first time domain signal into a first frequency domain signal and converting the second time domain signal into a second frequency domain signal; obtaining a time difference of the traveling wave arriving at the first collecting device and the second collecting device according to the first frequency domain signal and the second frequency domain signal; performing fault positioning based on the time difference; the obtaining of the time difference of the traveling wave arriving at the first collecting device and the second collecting device according to the first frequency domain signal and the second frequency domain signal comprises: solving a minimum value of a preset function, wherein the preset function is: to make a minimum as a time difference of the arrival of the traveling wave to the first acquisition device and the second acquisition device; wherein: the value range of the first frequency domain signal is , , the wave speed, the distance between the first acquisition device and the second acquisition device; the sampling point number; the real part of the complex number; the first frequency domain signal, the second frequency domain signal, the frequency variable, ; the angle of the complex number; the natural constant; the modulus of the complex number; j is the complex number unit, j 2 =-1.

2. The method of claim 1, wherein, after the obtaining of the time difference of the traveling wave arriving at the first collecting device and the second collecting device according to the first frequency domain signal and the second frequency domain signal, the method further comprises: The time difference obtained for the first time is corrected to obtain the time difference between the arrival of the traveling wave at the first and second acquisition devices.

3. The method of claim 2, wherein, correcting the first obtained time difference to obtain a corrected time difference comprising from the first time-domain signal a first signal segment is obtained from the first time-domain signal having a width of from the second time-domain signal a second signal segment is obtained from the second time-domain signal having a width of , is the time variable, wherein: is the time at which the first time-domain signal main wave peak is located, is the time length is the number of points required at the traveling wave sampling rate is the number of points required at the traveling wave sampling rate The cross-correlation signal is solved by the formula and The cross-correlation signal is solved by the formula wherein ; determining to cause the index for which ; Based on , and , the offset point number is obtained by interpolation processing; Substitute , and into the correction formula to obtain , the correction formula is as follows: 。 4. The method of claim 3, wherein, Based on , and , the offset point number includes: Substitute the values of , and into the interpolation processing formula to obtain the offset point number . The interpolation processing formula is as follows: 。 5. A power line fault location device, characterized by, The power transmission line fault positioning device comprises: an acquiring module, configured to acquire a first time domain signal of the traveling wave collected by a first collecting device and a second time domain signal of the traveling wave collected by a second collecting device, wherein the first collecting device and the second collecting device are located on two sides of the fault point respectively; a converting module, configured to convert the first time domain signal into a first frequency domain signal and convert the second time domain signal into a second frequency domain signal; a determining module, configured to obtain a time difference of the traveling wave arriving at the first collecting device and the second collecting device according to the first frequency domain signal and the second frequency domain signal; a positioning module, configured to perform fault positioning based on the time difference; the determining module is specifically configured to: solve a minimum value of a preset function, wherein the preset function is: to make a minimum as a time difference of the arrival of the traveling wave to the first acquisition device and the second acquisition device; wherein: the value range of , , is the wave speed, is the distance between the first acquisition device and the second acquisition device; is the sampling point number; is the real part of the complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency variable, ; is the angle of the complex number; is the natural constant; is the modulus of the complex number; j is the complex number unit, j 2 =-1.

6. The power line fault locator of claim 5, wherein, the determining module is further configured to: correcting the first obtained time difference to obtain as a time difference of arrival of the traveling wave at the first and second collecting devices.

7. A power line fault location apparatus characterized by, The power transmission line fault positioning device comprises a processor, a memory, and a power transmission line fault positioning program stored in the memory and executable by the processor, wherein when the power transmission line fault positioning program is executed by the processor, the steps of the power transmission line fault positioning method in any one of claims 1 to 4 are implemented.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a power transmission line fault positioning program, wherein when the power transmission line fault positioning program is executed by the processor, the steps of the power transmission line fault positioning method in any one of claims 1 to 4 are implemented.

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