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

Abstract

The invention discloses a power transmission line fault positioning method, device and equipment and a readable storage medium. The method comprises the steps that a first time domain signal, collected by a first collection device, of a traveling wave and a second time domain signal, collected by a second collection device, of the traveling wave are obtained, and the first collection device and the second collection device are located on the two sides of a 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; according to the first frequency domain signal and the second frequency domain signal, obtaining the time difference of the traveling wave arriving at the first acquisition device and the second acquisition device; and carrying out fault positioning based on the time difference. According to the invention, the time when the traveling waves arrive at the devices at the two sides is not calculated separately, but the time difference when the traveling waves arrive at the devices at the two sides is calculated directly by using the two traveling waves, thereby avoiding the situation that the error of a power transmission line fault positioning result is amplified when the two times are calculated separately in a conventional method, improving the accuracy of the power transmission line fault positioning result, and improving the accuracy of the power transmission line fault positioning result. And the application range is wider.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a method, apparatus, device and computer-readable storage medium for locating a transmission line fault. Background Art

[0002] Online monitoring and distributed fault location technology for transmission lines has been widely adopted across China's power transmission networks at all voltage levels. When a line is struck by lightning or suffers other types of faults, a traveling wave is generated at the fault point, propagating in both directions at nearly the speed of light. By installing data acquisition devices on the line to capture the traveling wave and record its precise arrival time, the fault location can be calculated based on the known line length.

[0003] Currently, in the field of traveling wave positioning, the most widely used and most mature method is the dual-end positioning method. Figure 1 , Figure 1 The following is a schematic diagram of the scenario of traveling wave positioning based on the dual-end positioning method. Figure 1 As shown in Figure 2, the principle of this method is to obtain the traveling waves collected by the devices on both sides of the fault point, calculate the wave head times t1 and t2 respectively, as the arrival time of the traveling waves, and then use Formula 1 or Formula 2 to obtain the distance between the fault point and the device on one side. Formula 1 is:

[0004] Formula 2 is:

[0005] In the above formula, 、 are the moments when the traveling wave reaches the first device and the second device, respectively. is the wave speed, is the distance between the two devices, 、 are the distances from the fault point to the first device and the second device, respectively.

[0006] Operational experience shows that the traditional two-terminal positioning method is not suitable for low-voltage lines (such as 35kV) or when a high-resistance fault occurs. Due to the complex fault process and the high level of environmental electromagnetic interference, the collected traveling waves contain a lot of noise and distortion, which in turn leads to a larger error in the calculation of the arrival time of the traveling waves. Assuming that the calculated arrival time t There are random errors e , which obeys the normal distribution:

[0007] Where, for e The variance of . According to formula 1 / 2, it is easy to get that if the two arrival times 、 The errors of are independent and identically distributed. After subtraction, the errors also obey the normal distribution, that is:

[0008] The variance of the normal distribution obeyed by the time difference is greater than the variance of a single arrival time, that is, > This shows that the calculation principle of the traditional two-end positioning method will amplify the calculation error and reduce the positioning accuracy. Summary of the Invention

[0009] The present application provides a method, device, equipment and computer-readable storage medium for locating faults in a power transmission line, which can solve the technical problem in the prior art that errors in the transmission line fault locating results are amplified due to the independent determination of the time when the traveling wave arrives at the devices on both sides.

[0010] In a first aspect, an embodiment of the present application provides a method for locating a power transmission line fault, the method comprising: Acquire a first time domain signal of a traveling wave collected by a first acquisition device and a second time domain signal of a traveling wave collected by a second acquisition device, wherein the first acquisition device and the second acquisition device are located on both 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 between the traveling wave reaching the first acquisition device and the second acquisition device according to the first frequency domain signal and the second frequency domain signal; Fault location is performed based on the time difference.

[0011] In conjunction with the first aspect, in one embodiment, obtaining the time difference between the traveling wave reaching the first acquisition device and the second acquisition device based on the first frequency domain signal and the second frequency domain signal includes: Find the minimum value of the preset function, the preset function is:

[0012] so that is the minimum value as the time difference between the arrival of the traveling wave at the first acquisition device and the second acquisition device; in:

[0013]

[0014]

[0015]

[0016] The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 .

[0017] In conjunction with the first aspect, in one embodiment, obtaining the time difference between the traveling wave reaching the first acquisition device and the second acquisition device based on the first frequency domain signal and the second frequency domain signal includes: Find the minimum value of the preset function, the preset function is:

[0018] so that is the minimum value As the estimated time difference between the traveling wave reaching the first acquisition device and the second acquisition device ; in:

[0019]

[0020]

[0021]

[0022] The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 ; Regarding the Correction processing is performed , as the time difference between the traveling wave reaching the first acquisition device and the second acquisition device.

[0023] In combination with the first aspect, in one embodiment, Corrective processing includes: From the first time domain signal The intercept width is The first signal segment is obtained from the second time domain signal The intercept width is sampling points to obtain the second signal segment , is the time independent variable, ,in:

[0024]

[0025] is the moment when the main wave peak of the first time domain signal is located, Duration At the traveling wave sampling rate The required number of points; By solving the formula of cross-correlation signal, we can get and The cross-correlation signal, the cross-correlation signal solution formula is as follows:

[0026] in, ; Confirm The index of the maximum value m ; based on 、 as well as , the offset points are obtained by interpolation ; Will 、 as well as Substituting into the correction formula, we get , the correction formula is as follows: .

[0027] In combination with the first aspect, in one embodiment, based on 、 as well as , the offset points are obtained by interpolation include: Will 、 as well as Substitute into the interpolation processing formula to get the number of offset points , the interpolation formula is as follows: .

[0028] In a second aspect, an embodiment of the present application provides a transmission line fault locating device, the transmission line fault locating device comprising: an acquisition module, configured to acquire 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, wherein the first acquisition device and the second acquisition device are located on both sides of the fault point, respectively; a conversion 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 determination module, configured to obtain a time difference between when the traveling wave reaches the first acquisition device and when the traveling wave reaches the second acquisition device based on the first frequency domain signal and the second frequency domain signal; A positioning module is used to locate the fault based on the time difference.

[0029] In conjunction with the second aspect, in one embodiment, the determining module is configured to: Find the minimum value of the preset function, the preset function is:

[0030] so that is the minimum value as the time difference between the arrival of the traveling wave at the first acquisition device and the second acquisition device; in:

[0031]

[0032]

[0033]

[0034] The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 .

[0035] In conjunction with the second aspect, in one embodiment, the determining module is configured to: Find the minimum value of the preset function, the preset function is:

[0036] so that is the minimum value As the estimated time difference between the traveling wave reaching the first acquisition device and the second acquisition device ; in:

[0037]

[0038]

[0039]

[0040] The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 ; Regarding the Correction processing is performed , as the time difference between the traveling wave reaching the first acquisition device and the second acquisition device.

[0041] In a third aspect, an embodiment of the present application provides a transmission line fault locating device, which includes a processor, a memory, and a transmission line fault locating program stored on the memory and executable by the processor, wherein when the transmission line fault locating program is executed by the processor, the steps of the transmission line fault locating method described in the first aspect are implemented.

[0042] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a transmission line fault locating program is stored. When the transmission line fault locating program is executed by a processor, the steps of the transmission line fault locating method described in the first aspect are implemented.

[0043] The beneficial effects of the technical solutions provided in the embodiments of the present application include: In an embodiment of the present application, a first time domain signal of a traveling wave collected by a first acquisition device and a second time domain signal of a traveling wave collected by a second acquisition device are obtained, wherein the first acquisition device and the second acquisition device are located on either side of the fault point, respectively; 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 of the traveling wave at the first acquisition device and the second acquisition device is obtained based on the first frequency domain signal and the second frequency domain signal; and the fault is located based on the time difference. Through the embodiment of the present application, the arrival time of the traveling wave at the devices on both sides is no longer calculated separately, but the time difference between the arrival time of the traveling wave at the devices on both sides is directly calculated using the two traveling waves. This avoids the situation in which the traditional method of calculating the two times separately leads to the amplification of the error in the transmission line fault location result, improves the accuracy of the transmission line fault location result, and has a wider range of applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Schematic diagram of the scenario of traveling wave positioning based on the dual-end positioning method; Figure 2 This is a flow chart of an embodiment of a method for locating a fault on a power transmission line according to the present application; Figure 3 This is a functional module diagram of an embodiment of a power transmission line fault location device of the present application; Figure 4 This is a schematic diagram of the hardware structure of the power transmission line fault locating device involved in the embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0047] In a first aspect, an embodiment of the present application provides a method for locating a transmission line fault.

[0048] In one embodiment, referring to Figure 2 , Figure 2 This is a flow chart of an embodiment of the method for locating a power transmission line fault according to the present application. Figure 2 As shown, the transmission line fault location method includes: Step S10, acquiring a first time domain signal of a traveling wave collected by a first acquisition device and a second time domain signal of a traveling wave collected by a second acquisition device, wherein the first acquisition device and the second acquisition device are located on both sides of the fault point respectively; 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; In this embodiment, refer to Figure 1 In the scenario shown, the traveling wave generated at the fault point propagates to both sides at a speed close to the speed of light. The first acquisition device and the second acquisition device located on both sides of the fault point can collect the first time domain signal. And the second time domain signal .

[0049] respectively and Perform FFT fast Fourier transform to obtain the first frequency domain signal and the second frequency domain signal Among them, before performing FFT, and The start and end points of the waveforms should be completely aligned and represent the same absolute timestamp. If the waveforms are different due to differences in the acquisition methods of the first and second acquisition devices, the inconsistent parts need to be trimmed to align the waveforms. is the time independent variable, ; is the frequency independent variable, ; is the number of sampling points.

[0050] Step S30, obtaining a time difference between the traveling wave reaching the first acquisition device and the second acquisition device according to the first frequency domain signal and the second frequency domain signal; In this embodiment, two approaches are provided for determining the time difference between the arrival of the traveling wave at the first and second acquisition devices based on the first and second frequency domain signals. One approach obtains an estimated time difference, which can be used in scenarios where high fault location accuracy is not a requirement but rapid fault location is required. The other approach first obtains an estimated time difference and then optimizes it to obtain a precise time difference, which can be used in scenarios where high fault location accuracy is required.

[0051] Furthermore, in one embodiment, step S30 includes: Find the minimum value of the preset function, the preset function is:

[0052] so that is the minimum value as the time difference between the arrival of the traveling wave at the first acquisition device and the second acquisition device; in:

[0053]

[0054]

[0055]

[0056] The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 .

[0057] In this embodiment, Refers to the frequency The phase difference at this time is calculated by using the circular domain regression method. Convert to unit plural , fitting uniform rotation speed ( ), avoiding the distortion caused by direct linear fitting of the phase difference (because the phase is a periodic variable); Refers to the frequency The amplitude spectrum at , combined with the preset function, can be seen through Corresponding right Weighted, it represents the comprehensive time difference of multiple frequency components of the actual traveling wave, which is more in line with its physical nature.

[0058] Furthermore, in one embodiment, step S30 includes: Find the minimum value of the preset function, the preset function is:

[0059] so that is the minimum value As the estimated time difference between the traveling wave reaching the first acquisition device and the second acquisition device ; in:

[0060]

[0061]

[0062]

[0063] The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 ; Regarding the Correction processing is performed , as the time difference between the traveling wave reaching the first acquisition device and the second acquisition device.

[0064] In this embodiment, Based on this, it is further corrected to obtain , and As the time difference between the traveling wave reaching the first acquisition device and the second acquisition device, the accuracy of the transmission line fault location result is effectively improved.

[0065] Furthermore, in one embodiment, Corrective processing includes: From the first time domain signal The intercept width is The first signal segment is obtained from the second time domain signal The intercept width is sampling points to obtain the second signal segment , is the time independent variable, ,in:

[0066]

[0067] is the moment when the main wave peak of the first time domain signal is located, Duration At the traveling wave sampling rate The required number of points; By solving the formula of cross-correlation signal, we can get and The cross-correlation signal, the cross-correlation signal solution formula is as follows:

[0068] in, ; Confirm The index of the maximum value m ; based on 、 as well as , the offset points are obtained by interpolation ; Will 、 as well as Substituting into the correction formula, we get , the correction formula is as follows: .

[0069] Furthermore, in one embodiment, based on 、 as well as , the offset points are obtained by interpolation include: Will 、 as well as Substitute into the interpolation processing formula to get the number of offset points , the interpolation formula is as follows: .

[0070] In this embodiment, based on the circular domain regression method and parabolic interpolation, the amplitude spectrum weighted signal frequency domain phase difference is used to calculate the precise time difference of the traveling waves at both ends of the transmission line, avoiding the problem of error amplification caused by the traditional method of separately calculating the time point of each traveling wave head.

[0071] Step S40: performing fault location based on the time difference.

[0072] In this embodiment, based on the determination of the time difference, combined with the distance calculation formula from the fault point to the collection devices on both sides in the traditional dual-end positioning method, the distance from the fault point to the collection devices on both sides can be determined, thus achieving fault location.

[0073] In an embodiment of the present application, a first time domain signal of a traveling wave collected by a first acquisition device and a second time domain signal of a traveling wave collected by a second acquisition device are obtained, wherein the first acquisition device and the second acquisition device are located on either side of the fault point, respectively; 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 of the traveling wave at the first acquisition device and the second acquisition device is obtained based on the first frequency domain signal and the second frequency domain signal; and the fault is located based on the time difference. Through the embodiment of the present application, the arrival time of the traveling wave at the devices on both sides is no longer calculated separately, but the time difference between the arrival time of the traveling wave at the devices on both sides is directly calculated using the two traveling waves. This avoids the situation in which the traditional method of calculating the two times separately leads to the amplification of the error in the transmission line fault location result, improves the accuracy of the transmission line fault location result, and has a wider range of applicability.

[0074] In a second aspect, an embodiment of the present application further provides a transmission line fault locating device.

[0075] In one embodiment, referring to Figure 3 , Figure 3 This is a functional module diagram of an embodiment of the power transmission line fault location device of the present application. Figure 3 As shown, the transmission line fault locating device includes: An acquisition module 10 is configured to acquire 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, wherein the first acquisition device and the second acquisition device are located on both sides of the fault point, respectively; A conversion module 20, 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 determination module 30, configured to obtain a time difference between the traveling wave reaching the first acquisition device and the second acquisition device based on the first frequency domain signal and the second frequency domain signal; The positioning module 40 is configured to perform fault positioning based on the time difference.

[0076] Furthermore, in one embodiment, the determination module 30 is configured to: Find the minimum value of the preset function, the preset function is:

[0077] so that is the minimum value as the time difference between the arrival of the traveling wave at the first acquisition device and the second acquisition device; in:

[0078]

[0079]

[0080]

[0081] The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 .

[0082] Furthermore, in one embodiment, the determination module 30 is configured to: Find the minimum value of the preset function, the preset function is:

[0083] so that is the minimum value As the estimated time difference between the traveling wave reaching the first acquisition device and the second acquisition device ; in:

[0084]

[0085]

[0086]

[0087] The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 ; Regarding the Correction processing is performed , as the time difference between the traveling wave reaching the first acquisition device and the second acquisition device.

[0088] Furthermore, in one embodiment, the determination module 30 is configured to: From the first time domain signal The intercept width is The first signal segment is obtained from the second time domain signal The intercept width is sampling points to obtain the second signal segment , is the time independent variable, ,in:

[0089]

[0090] is the moment when the main wave peak of the first time domain signal is located, Duration At the traveling wave sampling rate The required number of points; By solving the formula of cross-correlation signal, we can get and The cross-correlation signal, the cross-correlation signal solution formula is as follows:

[0091] in, ; Confirm The index of the maximum value m ; based on 、 as well as , the offset points are obtained by interpolation ; Will 、 as well as Substituting into the correction formula, we get , the correction formula is as follows: .

[0092] Furthermore, in one embodiment, the determination module 30 is configured to: Will 、 as well as Substitute into the interpolation processing formula to get the number of offset points , the interpolation formula is as follows: .

[0093] The functional implementation of each module in the above-mentioned transmission line fault locating device corresponds to each step in the above-mentioned transmission line fault locating method embodiment, and their functions and implementation processes are not described here one by one.

[0094] In a third aspect, an embodiment of the present application provides a power transmission line fault locating device, which may be a device with data processing capabilities, such as a personal computer (PC), a laptop computer, or a server.

[0095] Reference Figure 4 , Figure 4 FIG2 is a schematic diagram of the hardware structure of a power transmission line fault location device involved in an embodiment of the present application. In the embodiment of the present application, the power transmission line fault location device may include a processor, a memory, a communication interface, and a communication bus.

[0096] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0097] Communication interfaces include input / output (I / O), physical, and logical interfaces, which interconnect components within the power line fault locating device and other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet, fiber, or ATM; user equipment can include displays and keyboards.

[0098] 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), etc.

[0099] The processor may be a general-purpose processor that can invoke a power transmission line fault location program stored in a memory and execute the power transmission line fault location method provided in the embodiments of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the power transmission line fault location program is invoked can be referenced to the various embodiments of the power transmission line fault location method of the present application and will not be further described here.

[0100] Those skilled in the art will understand that Figure 4 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0101] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0102] The computer-readable storage medium of the present application stores a power transmission line fault locating program, wherein when the power transmission line fault locating program is executed by a processor, the steps of the above-mentioned power transmission line fault locating method are implemented.

[0103] Among them, the method implemented when the transmission line fault locating program is executed can refer to the various embodiments of the transmission line fault locating method of the present application, and will not be described in detail here.

[0104] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0105] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0106] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0107] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0108] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0109] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, or the part that contributes to the existing technology, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of this application.

[0110] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, 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 for locating a transmission line fault, characterized in that: The transmission line fault locating method comprises: Acquire a first time domain signal of a traveling wave collected by a first acquisition device and a second time domain signal of a traveling wave collected by a second acquisition device, wherein the first acquisition device and the second acquisition device are located on both 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 between the traveling wave reaching the first acquisition device and the second acquisition device according to the first frequency domain signal and the second frequency domain signal; Fault location is performed based on the time difference.

2. The method for locating a transmission line fault according to claim 1, wherein: The step of obtaining the time difference between the traveling wave reaching the first acquisition device and the second acquisition device according to the first frequency domain signal and the second frequency domain signal comprises: Find the minimum value of the preset function, the preset function is: so that is the minimum value as the time difference between the arrival of the traveling wave at the first acquisition device and the second acquisition device; in: The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 .

3. The method for locating a transmission line fault according to claim 1, wherein: The step of obtaining the time difference between the traveling wave reaching the first acquisition device and the second acquisition device according to the first frequency domain signal and the second frequency domain signal comprises: Find the minimum value of the preset function, the preset function is: so that is the minimum value As the estimated time difference between the traveling wave reaching the first acquisition device and the second acquisition device ; in: The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 ; Regarding the Correction processing is performed , as the time difference between the traveling wave reaching the first acquisition device and the second acquisition device.

4. The method for locating a transmission line fault according to claim 3, wherein: Regarding the Corrective processing includes: From the first time domain signal The intercept width is The first signal segment is obtained from the second time domain signal The intercept width is sampling points to obtain the second signal segment , is the time independent variable, ,in: is the moment when the main wave peak of the first time domain signal is located, Duration At the traveling wave sampling rate The required number of points; By solving the formula of cross-correlation signal, we can get and The cross-correlation signal, the cross-correlation signal solution formula is as follows: in, ; Confirm The index of the maximum value m ; based on 、 as well as , the offset points are obtained by interpolation ; Will 、 as well as Substituting into the correction formula, we get , the correction formula is as follows: 。 5. The method for locating a transmission line fault according to claim 4, wherein: based on 、 as well as , the offset points are obtained by interpolation include: Will 、 as well as Substitute into the interpolation processing formula to get the number of offset points , the interpolation formula is as follows: 。 6. A transmission line fault location device, characterized in that: The transmission line fault locating device comprises: an acquisition module, configured to acquire 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, wherein the first acquisition device and the second acquisition device are located on both sides of the fault point, respectively; a conversion 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 determination module, configured to obtain a time difference between when the traveling wave reaches the first acquisition device and when the traveling wave reaches the second acquisition device based on the first frequency domain signal and the second frequency domain signal; A positioning module is used to locate the fault based on the time difference.

7. The power transmission line fault location device according to claim 6, characterized in that: Identify modules for: Find the minimum value of the preset function, the preset function is: so that is the minimum value as the time difference between the arrival of the traveling wave at the first acquisition device and the second acquisition device; in: The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 .

8. The power transmission line fault location device according to claim 6, characterized in that: Identify modules for: Find the minimum value of the preset function, the preset function is: so that is the minimum value As the estimated time difference between the traveling wave reaching the first acquisition device and the second acquisition device ; in: The value range is [ , ], , is the wave speed, is the distance between the first collection device and the second collection device; is the number of sampling points; To find the real part of a complex number; is the first frequency domain signal, is the second frequency domain signal, is the frequency independent variable, ; To find complex angles; is a natural constant; To find the modulus of a complex number; j is the complex unit, j 2 ; Regarding the Correction processing is performed , as the time difference between the traveling wave reaching the first acquisition device and the second acquisition device.

9. A transmission line fault location device, characterized in that: The power transmission line fault locating device includes a processor, a memory, and a power transmission line fault locating program stored in the memory and executable by the processor, wherein when the power transmission line fault locating program is executed by the processor, the steps of the power transmission line fault locating method according to any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a power transmission line fault locating program, wherein when the power transmission line fault locating program is executed by a processor, the steps of the power transmission line fault locating method according to any one of claims 1 to 5 are implemented.

Images