Fault position determination method and device and computer readable storage medium

Abstract

The invention relates to the technical field of electric power, and provides a fault position determination method and device and a computer readable storage medium. The pulse frequency, the pulse rising edge duration and the polarity of each traveling wave pulse in the multiple traveling wave pulses in the target time period are obtained; determining at least one reflection traveling wave pulse of a target traveling wave pulse in the plurality of traveling wave pulses according to the pulse frequency, the pulse rising edge duration and the polarity of each traveling wave pulse in the plurality of traveling wave pulses; determining a target distance according to the first moment and the second moment; the target distance is the distance between the fault position on the power transmission line and the fault position determining device. The accuracy of determining the fault position can be improved.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to methods, apparatus and computer-readable storage media for determining fault location. Background Technology

[0002] After a fault occurs in a power transmission line, it is necessary to determine the location of the fault in order to carry out repairs at the location where the fault occurred.

[0003] When a fault occurs in a transmission line, a sudden and significant voltage or current surge occurs at the fault location. This surge propagates as a wave at near the speed of light towards both ends of the transmission line; this wave is called a traveling wave. Current methods for determining the fault location involve installing a traveling wave detection device at one end of the transmission line. However, due to impedance discontinuities such as power towers, branch lines, and substations at the opposite end of the transmission line, the traveling wave becomes complex and varied, resulting in poor accuracy in fault location determination. Summary of the Invention This application provides a method, apparatus, and computer-readable storage medium for determining fault location, which can improve the accuracy of fault location determination.

[0004] To achieve the above objectives, this application adopts the following technical solution: Firstly, a fault location determination method is provided, which is applied to a fault location determination device. The method includes: when the fault location determination device detects a traveling wave pulse on a transmission line, acquiring the pulse frequency, pulse rise time duration, and polarity of each traveling wave pulse among multiple traveling wave pulses within a target time period; the start time of the target time period is the time when the fault location determination device detects the traveling wave pulse on the transmission line, the duration of the target time period is a preset duration, and the traveling wave pulse is a half-cycle pulse; determining at least one reflected traveling wave pulse of a target traveling wave pulse among the multiple traveling wave pulses based on the pulse frequency, pulse rise time duration, and polarity of each traveling wave pulse among the multiple traveling wave pulses; the target traveling wave pulse is the traveling wave pulse whose wavefront arrives at the fault location determination device earliest among the multiple traveling wave pulses; determining a target distance based on a first time and a second time; the target distance is the distance between the fault location on the transmission line and the fault location determination device; the first time is the time when the wavefront of the target traveling wave pulse arrives at the fault location determination device, and the second time is the time when the wavefront of the reflected traveling wave pulse arrives at the fault location determination device, and the number of second times is one or more.

[0005] Based on this scheme, after the fault location determination device detects a traveling wave pulse on the transmission line, it indicates that a fault has occurred on the transmission line. By acquiring the pulse frequency, pulse rise time, and polarity of each traveling wave pulse among multiple traveling wave pulses within a target time period, and since the target traveling wave pulse is the traveling wave pulse whose wavefront arrives at the fault location determination device earliest among the multiple traveling wave pulses, it indicates that the target traveling wave pulse is a traveling wave directly generated by the fault. Based on the pulse frequency, pulse rise time, and polarity of each traveling wave pulse, the reflected traveling wave pulse of the target traveling wave pulse can be determined. Therefore, the reflected traveling wave pulse of the target traveling wave pulse can be determined from multiple traveling wave pulses. After determining the reflected traveling wave pulse of the target traveling wave pulse, the distance between the fault location on the transmission line and the fault location determination device can be determined based on the first moment when the wavefront of the target traveling wave pulse arrives at the fault location determination device and the second moment when the wavefront of the reflected traveling wave pulse arrives at the fault location determination device, thereby improving the accuracy of fault location determination.

[0006] In conjunction with the first aspect, in certain embodiments of the first aspect, determining the reflected traveling wave pulse of the target traveling wave pulse among the plurality of traveling wave pulses based on the pulse frequency, pulse rise time, and polarity of each traveling wave pulse among the plurality of traveling wave pulses includes: taking a traveling wave pulse among the plurality of traveling wave pulses whose pulse frequency is the same as the pulse frequency of the target traveling wave pulse as a first traveling wave pulse, to obtain at least one first traveling wave pulse; taking a traveling wave pulse among the at least one first traveling wave pulse whose polarity is the same as the polarity of the target traveling wave pulse as a second traveling wave pulse, to obtain at least one second traveling wave pulse; and determining the reflected traveling wave pulse of the target traveling wave pulse among the at least one second traveling wave pulse based on the pulse rise time of the at least one second traveling wave pulse and the pulse rise time of the target traveling wave pulse.

[0007] Based on this scheme, since the target traveling wave pulse and its reflected traveling wave pulse have the same source, both generated by the same fault, the pulse frequency, pulse rise time, and polarity of the target traveling wave pulse and its reflected traveling wave pulse are similar. Therefore, by screening the pulse frequency, pulse rise time, and polarity of multiple traveling wave pulses, the reflected traveling wave pulse of the target traveling wave pulse can be determined.

[0008] In conjunction with the first aspect, in some embodiments of the first aspect, determining the reflected traveling wave pulse of the target traveling wave pulse among at least one second traveling wave pulse based on the pulse rise time of at least one second traveling wave pulse and the pulse rise time of the target traveling wave pulse includes: taking the difference between the pulse rise time of the target traveling wave pulse and the target product as one end of the target duration interval, and taking the sum of the pulse rise time of the target traveling wave pulse and the target product as the other end of the target duration interval, thereby obtaining the target duration interval; the target product is the product of the pulse rise time of the target traveling wave pulse and a preset coefficient, wherein the preset coefficient is less than 1; and taking the second traveling wave pulse among at least one second traveling wave pulse whose pulse rise time is within the target duration interval as the reflected traveling wave pulse of the target traveling wave pulse.

[0009] Based on this scheme, ideally, the rising edge duration of the target traveling wave pulse and the rising edge duration of its reflected traveling wave pulse are the same. However, in reality, due to the influence of the complex environment in the transmission line, the rising edge duration of the reflected traveling wave pulse will be slightly different from that of the target traveling wave pulse. Since the midpoint of the target duration interval is the rising edge duration of the target traveling wave pulse, by taking the second traveling wave pulse whose rising edge duration is within the target duration interval as the reflected traveling wave pulse of the target traveling wave pulse, the requirement for the rising edge duration of the reflected traveling wave pulse can be appropriately relaxed, thereby improving the flexibility in determining the reflected traveling wave pulse.

[0010] In conjunction with the first aspect, in some embodiments of the first aspect, obtaining the pulse rising edge duration of each traveling wave pulse among multiple traveling wave pulses within a target time period includes: for each traveling wave pulse among multiple traveling wave pulses, obtaining the time corresponding to the first amplitude and the time corresponding to the second amplitude in the pulse rising edge of the traveling wave pulse; the ratio of the first amplitude to the maximum value of the traveling wave pulse amplitude is 1 / 10, and the ratio of the second amplitude to the maximum value of the traveling wave pulse amplitude is 9 / 10; the difference between the time corresponding to the second amplitude and the time corresponding to the first amplitude is taken as the pulse rising edge duration of the traveling wave pulse.

[0011] Based on this scheme, since the start and end phases of the rising edge of the traveling wave pulse are greatly affected by external factors and are unstable, the accuracy of determining the rising edge duration of the traveling wave pulse can be improved by using the difference between the time corresponding to the second amplitude and the time corresponding to the first amplitude as the rising edge duration of the traveling wave pulse.

[0012] In conjunction with the first aspect, in some embodiments of the first aspect, when the number of second time points is one, determining the target distance based on the first time point and the second time point includes: determining the target distance based on a first relationship: Where x represents the target distance, Indicates the second moment. V represents the first moment, V represents the wave velocity of the traveling wave pulse, and n represents the order of the reflected traveling wave pulse in the target sequence corresponding to the second moment. The target sequence is the order of the times when the wavefront of at least one reflected traveling wave pulse arrives at the fault location determination device from earliest to latest.

[0013] In conjunction with the first aspect, in some embodiments of the first aspect, the reflected traveling wave pulse corresponding to the second moment is in the order of 1 in the target sequence.

[0014] Based on this scheme, the later the reflected traveling wave pulse arrives at the fault location determination device, the more interference it receives; the earlier the reflected traveling wave pulse arrives at the fault location determination device, the less interference it receives. Determining the target distance based on the reflected traveling wave pulse that arrives at the fault location determination device earlier can improve the accuracy of fault location determination.

[0015] In conjunction with the first aspect, in some embodiments of the first aspect, when there are multiple second moments, determining the target distance based on the first and second moments includes: for each of the multiple second moments, determining an initial distance based on a first relationship. Where x represents the target distance, Indicates the second moment. V represents the wave velocity of the traveling wave pulse at the first moment, and n represents the order of the reflected traveling wave pulse in the target sequence at the second moment. The target sequence is the order of the arrival times of the wavefront of at least one reflected traveling wave pulse at the fault location determination device from earliest to latest. The average of multiple initial distances is used as the target distance.

[0016] Based on this scheme, in some cases, there may be errors in the second time step. In such cases, determining the target distance based on a single second time step will also lead to errors in the determined target distance. By determining an initial distance based on a single second time step when there are multiple second time steps, and then using the average of multiple initial distances as the target distance, the accuracy of the determined target distance can be improved.

[0017] Secondly, a fault location determination device is provided to implement the fault location determination method of the first aspect described above. The fault location determination device includes modules, units, or means corresponding to the above method. These modules, units, or means can be implemented in hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

[0018] In conjunction with the second aspect, in some embodiments of the second aspect, the apparatus includes: an acquisition module and a processing module; the acquisition module is configured to acquire, when the fault location determining device detects a traveling wave pulse on the transmission line, the pulse frequency, pulse rise time duration, and polarity of each traveling wave pulse among a plurality of traveling wave pulses within a target time period; the start time of the target time period is the time when the fault location determining device detects the traveling wave pulse on the transmission line, the duration of the target time period is a preset duration, and the traveling wave pulse is a half-cycle pulse; the processing module is configured to determine at least one reflected traveling wave pulse of a target traveling wave pulse among the plurality of traveling wave pulses based on the pulse frequency, pulse rise time duration, and polarity of each traveling wave pulse among the plurality of traveling wave pulses; the target traveling wave pulse is the traveling wave pulse whose wavefront arrives at the fault location determining device earliest among the plurality of traveling wave pulses; the processing module is further configured to determine a target distance based on a first time and a second time; the target distance is the distance between the fault location on the transmission line and the fault location determining device; the first time is the time when the wavefront of the target traveling wave pulse arrives at the fault location determining device, the second time is the time when the wavefront of the reflected traveling wave pulse arrives at the fault location determining device, and the number of second times is one or more.

[0019] Thirdly, a fault location determination apparatus is provided, comprising: at least one processor and a memory for storing processor-executable instructions; wherein the processor is configured to execute instructions to implement the method provided by the first aspect and any possible implementation thereof.

[0020] Fourthly, a computer-readable storage medium is provided, wherein when instructions in the computer-readable storage medium are executed by a processor of a fault location determination device, the fault location determination device is enabled to perform the method provided by the first aspect and any possible implementation thereof.

[0021] Fifthly, a computer program product containing instructions is provided that, when run on a computer, enables the computer to perform the methods provided in the first aspect and any possible implementation thereof.

[0022] The technical effects of any one of the second to fifth aspects can be found in the technical effects of the different embodiments of the first aspect described above, and will not be repeated here. Attached Figure Description

[0023] Figure 1 This application provides a schematic diagram of the architecture of a fault location determination system; Figure 2 A flowchart illustrating a fault location determination method provided in this application; Figure 3 A flowchart illustrating yet another fault location determination method provided in this application; Figure 4 A flowchart illustrating yet another fault location determination method provided in this application; Figure 5 A schematic diagram of a fault location determination device provided in this application; Figure 6 A schematic diagram of another fault location determination device provided in this application. Detailed Implementation

[0024] In the description of this application, unless otherwise stated, "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0025] Furthermore, to facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0026] In this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being better or more advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0027] It is understood that the term "embodiment" used throughout the specification means that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, various embodiments throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0028] It is understood that in this application, "when," "if," and "if" all refer to the corresponding processing that will be carried out under certain objective circumstances, and are not limited to a specific time, nor do they require that there must be a judgment action when implemented, nor do they imply any other limitations.

[0029] It is understood that some optional features in the embodiments of this application can be implemented independently in certain scenarios without relying on other features, such as the current solution on which they are based, to solve the corresponding technical problems and achieve the corresponding effects. Alternatively, they can be combined with other features as needed in certain scenarios. Correspondingly, the apparatus given in the embodiments of this application can also implement these features or functions, which will not be elaborated here.

[0030] In this application, unless otherwise specified, the same or similar parts between the various embodiments can be referred to each other. In the various embodiments and implementation methods of the various embodiments in this application, unless otherwise specified or logically conflicting, the terminology and / or descriptions between different embodiments and between the implementation methods of the various embodiments are consistent and can be mutually referenced. The technical features in different embodiments and between the implementation methods of the various embodiments can be combined according to their inherent logical relationships to form new embodiments, implementation methods, implementation methods, or implementation approaches. The following embodiments of this application do not constitute a limitation on the scope of protection of this application.

[0031] After a fault occurs in a power transmission line, it is necessary to determine the location of the fault in order to carry out repairs at the location where the fault occurred.

[0032] When a fault occurs in a transmission line, a sudden and significant voltage or current surge occurs at the fault location. This surge propagates as a wave at near the speed of light towards both ends of the transmission line; this wave is called a traveling wave. Current methods for determining the fault location involve installing a traveling wave detection device at one end of the transmission line. However, due to impedance discontinuities such as power towers, branch lines, and substations at the opposite end of the transmission line, the traveling wave becomes complex and varied, resulting in poor accuracy in fault location determination. To address the above problems, this application provides a method for determining fault location. Figure 1 This is a schematic diagram of the architecture of a fault location determination system provided in this application. The technical solutions of the embodiments of this application can be applied to... Figure 1 The fault location determination system shown is as follows: Figure 1 As shown, the fault location determination system 10 includes a fault location determination device 11 and a power transmission line 12.

[0033] The fault location determination device 11 is installed at one end of the transmission line 12. After a fault occurs in the transmission line 12, the fault will generate a traveling wave. After the traveling wave reaches the fault location determination device 11, the fault location determination device 11 can detect the traveling wave in the transmission line 12. Subsequently, the fault location determination method provided in this application can be executed to determine the fault location.

[0034] The following description, with reference to the accompanying drawings, uses the application of the fault location determination method to a fault location determination device as an example to illustrate the fault location determination method provided in the embodiments of this application.

[0035] Figure 2 A flowchart illustrating a fault location determination method provided in this application is shown below. Figure 2 As shown, the method includes the following steps: S201. When the fault location determination device detects a traveling wave pulse on the transmission line, it acquires the pulse frequency, pulse rise time, and polarity of each traveling wave pulse among multiple traveling wave pulses within a target time period.

[0036] The target time period begins at the moment when the fault location determination device detects a traveling wave pulse on the transmission line, the duration of the target time period is a preset duration, and the traveling wave pulse is a half-cycle pulse.

[0037] It should be noted that the traveling wave pulse can be a voltage traveling wave pulse or a current traveling wave pulse, and this application does not impose any specific restrictions on it.

[0038] The polarity of a traveling wave pulse includes positive and negative polarity. When the polarity of the traveling wave pulse is positive, the amplitude of the traveling wave pulse is greater than the reference zero value. When the polarity of the traveling wave pulse is negative, the amplitude of the traveling wave pulse is less than the reference zero value.

[0039] The preset duration can be 1ms, 2ms, or 3ms. Of course, the preset duration can also have other values, and this application does not impose specific restrictions on this.

[0040] As one possible implementation, the fault location determination device captures transient signals, identifies and extracts traveling wave characteristics from the transient signals, analyzes and judges the traveling wave characteristics, and finally determines that a traveling wave pulse has been detected on the transmission line.

[0041] It should be noted that the above is a general description of the scheme for the fault location determination device to detect traveling wave pulses on the transmission line. The specific scheme for the fault location determination device to detect traveling wave pulses on the transmission line can refer to existing schemes, and will not be described in detail here.

[0042] After the fault location determination device detects a traveling wave pulse on the transmission line, it captures each traveling wave pulse on the transmission line within a preset time period, starting from the moment the fault location determination device detects the traveling wave pulse on the transmission line. It then analyzes each traveling wave pulse to obtain the pulse frequency, pulse rise time, and polarity of each traveling wave pulse.

[0043] For example, the fault location determination device determines the pulse frequency of the traveling wave pulse using an autocorrelation function. Specific solutions can be found in existing solutions, and will not be described in detail here.

[0044] To determine the polarity of the traveling wave pulse, the fault location device uses wavelet transform to analyze the initial wavefront of the traveling wave pulse and obtain its polarity. Specific solutions can be found in existing solutions, and will not be described in detail here.

[0045] Regarding the pulse rise time of the traveling wave pulse, the fault location determination device acquires the time corresponding to the first amplitude and the time corresponding to the second amplitude within the pulse rise time of the traveling wave pulse; the difference between the time corresponding to the second amplitude and the time corresponding to the first amplitude is taken as the pulse rise time of the traveling wave pulse. Specifically, the ratio of the first amplitude to the maximum amplitude of the traveling wave pulse is 1 / 10, and the ratio of the second amplitude to the maximum amplitude of the traveling wave pulse is 9 / 10.

[0046] Specifically, the fault location determination device determines the extreme values ​​of the traveling wave pulse. After obtaining the extreme values ​​of the traveling wave pulse, the first amplitude and the second amplitude can be determined. Finally, the fault location determination device determines the time corresponding to the first amplitude and the time corresponding to the second amplitude through wavelet transform. Finally, the difference between the two times is taken as the pulse rise time of the traveling wave pulse.

[0047] Thus, since the start and end phases of the rising edge of a traveling wave pulse are greatly affected by external factors and are unstable, the accuracy of determining the rising edge duration of the traveling wave pulse can be improved by using the difference between the time corresponding to the second amplitude and the time corresponding to the first amplitude as the rising edge duration of the traveling wave pulse.

[0048] S202. The fault location determination device determines at least one reflected traveling wave pulse of the target traveling wave pulse among the multiple traveling wave pulses based on the pulse frequency, pulse rise time and polarity of each traveling wave pulse among the multiple traveling wave pulses.

[0049] Among them, the target traveling wave pulse is the traveling wave pulse whose wavefront arrives at the fault location determination device earliest among multiple traveling wave pulses.

[0050] In one possible implementation, the fault location determination device uses a traveling wave pulse whose pulse frequency is the same as that of the target traveling wave pulse from among multiple traveling wave pulses to obtain at least one first traveling wave pulse. Then, it uses a traveling wave pulse whose polarity is the same as that of the target traveling wave pulse from among the at least one first traveling wave pulse to obtain at least one second traveling wave pulse. Subsequently, based on the rise time of the at least one second traveling wave pulse and the rise time of the target traveling wave pulse, it determines the reflected traveling wave pulse of the target traveling wave pulse from among the at least one second traveling wave pulse.

[0051] It should be noted that for a detailed description of this possible implementation method, please refer to the relevant description in the subsequent sections of the specific implementation method of this application, which will not be described here.

[0052] S203, The fault location determination device determines the target distance based on the first moment and the second moment.

[0053] The target distance is the distance between the fault location on the transmission line and the fault location determination device; the first moment is the moment when the wavefront of the target traveling wave pulse arrives at the fault location determination device; the second moment is the moment when the wavefront of the reflected traveling wave pulse arrives at the fault location determination device; and the number of second moments is one or more.

[0054] As one possible implementation, when the number at the second moment is 1, the fault location determination device determines the target distance based on the first relationship: Where x represents the target distance, Indicates the second moment. V represents the first moment, V represents the wave velocity of the traveling wave pulse, and n represents the order of the reflected traveling wave pulse in the target sequence corresponding to the second moment. The target sequence is the order of the times when the wavefront of at least one reflected traveling wave pulse arrives at the fault location determination device from earliest to latest.

[0055] The order of the reflected traveling wave pulses corresponding to the second moment in the target sequence can be arbitrary. For example, the order of the reflected traveling wave pulses corresponding to the second moment in the target sequence is 1, 2, 3, 4. Of course, this order can also have other values, and this application does not impose any specific restrictions on it.

[0056] Understandably, the smaller the order of the reflected traveling wave pulse in the target sequence, the earlier it arrives at the fault location determining device; conversely, the larger the order, the later it arrives. For example, if one reflected traveling wave pulse is number 1 in the target sequence and another is number 2, then the reflected traveling wave pulse with order 1 arrives at the fault location determining device earlier than the reflected traveling wave pulse with order 2.

[0057] Preferably, the reflected traveling wave pulse corresponding to the second moment is in the order of 1 in the target sequence. The later the reflected traveling wave pulse arrives at the fault location determining device, the more interference it receives. The earlier the reflected traveling wave pulse arrives at the fault location determining device, the less interference it receives. Determining the target distance based on the reflected traveling wave pulse that arrives at the fault location determining device earlier can improve the accuracy of determining the fault location.

[0058] As another possible implementation, when there are multiple second moments, the fault location determination device determines the initial distance for each of the multiple second moments based on a first relationship: Where x represents the target distance, Indicates the second moment. V represents the first moment, V represents the wave velocity of the traveling wave pulse, and n represents the order of the reflected traveling wave pulse in the target sequence corresponding to the second moment. The target sequence is the order of the times when the wavefront of at least one reflected traveling wave pulse arrives at the fault location determination device from earliest to latest.

[0059] Subsequently, the fault location determination device uses the average of multiple initial distances as the target distance.

[0060] Based on this possible implementation, in some cases, there may be errors in the second time step. In this case, determining the target distance based on a single second time step will also lead to errors in the determined target distance. By determining an initial distance based on a single second time step when there are multiple second time steps, and then using the average of multiple initial distances as the target distance, the accuracy of the determined target distance can be improved.

[0061] Based on S201-S203, after the fault location determination device detects a traveling wave pulse on the transmission line, it indicates that a fault has occurred on the transmission line. By acquiring the pulse frequency, pulse rise time, and polarity of each traveling wave pulse among multiple traveling wave pulses within the target time period, and since the target traveling wave pulse is the traveling wave pulse whose wavefront arrives at the fault location determination device earliest among the multiple traveling wave pulses, it indicates that the target traveling wave pulse is a traveling wave directly generated by the fault. Based on the pulse frequency, pulse rise time, and polarity of each traveling wave pulse, the reflected traveling wave pulse of the target traveling wave pulse can be determined. Therefore, the reflected traveling wave pulse of the target traveling wave pulse can be determined from multiple traveling wave pulses. After determining the reflected traveling wave pulse of the target traveling wave pulse, the distance between the fault location on the transmission line and the fault location determination device can be determined based on the first moment when the wavefront of the target traveling wave pulse arrives at the fault location determination device and the second moment when the wavefront of the reflected traveling wave pulse arrives at the fault location determination device, thereby improving the accuracy of fault location determination.

[0062] The above is a general description of the fault location determination method provided in this application. The following will provide a further explanation of the fault location determination method provided in this application.

[0063] Figure 3 A flowchart illustrating another fault location determination method provided in this application is shown below. Figure 3 As shown, S202 provided in the specific embodiments of this application may include the following steps: S301, The fault location determination device takes the traveling wave pulse with the same pulse frequency as the target traveling wave pulse from multiple traveling wave pulses as the first traveling wave pulse, and obtains at least one first traveling wave pulse.

[0064] As one possible implementation, the fault location determination device compares the pulse frequency of each traveling wave pulse (excluding the target traveling wave pulse) with the pulse frequency of the target traveling wave pulse for each of the multiple traveling wave pulses. If the pulse frequency of the traveling wave pulse is the same as that of the target traveling wave pulse, then the traveling wave pulse is the first traveling wave pulse. If the pulse frequency of the traveling wave pulse is not the same as that of the target traveling wave pulse, then the traveling wave pulse is not the first traveling wave pulse, thereby obtaining at least one first traveling wave pulse.

[0065] S302, The fault location determination device takes at least one first traveling wave pulse whose polarity is the same as that of the target traveling wave pulse as the second traveling wave pulse, and obtains at least one second traveling wave pulse.

[0066] As one possible implementation, the fault location determination device compares the polarity of each first traveling wave pulse with the polarity of a target traveling wave pulse for each of at least one first traveling wave pulse. If the polarity of the first traveling wave pulse is the same as that of the target traveling wave pulse, then the first traveling wave pulse is a second traveling wave pulse. If the polarity of the first traveling wave pulse is different from that of the target traveling wave pulse, then the first traveling wave pulse is not a second traveling wave pulse, thereby obtaining at least one second traveling wave pulse.

[0067] S303, The fault location determination device determines the reflected traveling wave pulse of the target traveling wave pulse in at least one second traveling wave pulse based on the pulse rise time of at least one second traveling wave pulse and the pulse rise time of the target traveling wave pulse.

[0068] As one possible implementation, the fault location determination device compares the pulse rise time of each of the at least one second traveling wave pulses with the pulse rise time of the target traveling wave pulse. If the pulse rise time of the second traveling wave pulse is the same as that of the target traveling wave pulse, then the second traveling wave pulse is a reflected traveling wave pulse of the target traveling wave pulse. If the pulse rise time of the second traveling wave pulse is different from that of the target traveling wave pulse, then the second traveling wave pulse is not a reflected traveling wave pulse of the target traveling wave pulse, thus obtaining the reflected traveling wave pulse of the target traveling wave pulse.

[0069] As another possible implementation, the fault location determination device uses the difference between the rise time of the target traveling wave pulse and the target product as one end of the target duration interval, and the sum of the rise time of the target traveling wave pulse and the target product as the other end of the target duration interval, thus obtaining the target duration interval; the target product is the product of the rise time of the target traveling wave pulse and a preset coefficient. Subsequently, at least one second traveling wave pulse whose rise time is within the target duration interval is used as the reflected traveling wave pulse of the target traveling wave pulse.

[0070] It should be noted that for a detailed description of this possible implementation method, please refer to the relevant description in the subsequent sections of the specific implementation method of this application, which will not be described here.

[0071] Based on S302-S303, since the target traveling wave pulse and its reflected traveling wave pulse have the same source, both generated by the same fault, the pulse frequency, pulse rise time, and polarity of the target traveling wave pulse and its reflected traveling wave pulse are similar. Therefore, by screening the pulse frequency, pulse rise time, and polarity of multiple traveling wave pulses, the reflected traveling wave pulse of the target traveling wave pulse can be determined.

[0072] Figure 4A flowchart illustrating another fault location determination method provided in this application is shown below. Figure 4 As shown, S303 provided in the specific embodiments of this application may include the following steps: S401, The fault location determination device takes the difference between the rising edge duration of the target traveling wave pulse and the target product as one end of the target duration interval, and takes the sum of the rising edge duration of the target traveling wave pulse and the target product as the other end of the target duration interval, thus obtaining the target duration interval.

[0073] The target product is the product of the rise time of the target traveling wave pulse and a preset coefficient.

[0074] It should be noted that the preset coefficient is less than 1. For example, the preset coefficient can be 0.1, 0.2, or 0.3. Of course, the preset coefficient can also be other values. This application does not impose any specific restrictions on this.

[0075] As one possible implementation, taking the rise time of the target traveling wave pulse as 10 microseconds and the preset coefficient as 0.1 as an example, the fault location determination device determines the target product as 10 microseconds × 0.1 = 1 microsecond. Then, it determines one end of the target duration interval as 10 microseconds - 1 microsecond = 9 microseconds and the other end of the target duration interval as 10 microseconds + 1 microsecond = 11 microseconds. The target duration interval is determined to be [9 microseconds, 11 microseconds].

[0076] S402, The fault location determination device takes at least one second traveling wave pulse whose pulse rising edge duration is within the target duration interval as the reflected traveling wave pulse of the target traveling wave pulse.

[0077] As one possible implementation, the fault location determination device determines, for each of the at least one second traveling wave pulses, whether the pulse rise edge duration of each second traveling wave pulse is within a target duration interval. If the pulse rise edge duration of the second traveling wave pulse is within the target duration interval, then the second traveling wave pulse is a reflected traveling wave pulse of the target traveling wave pulse. If the pulse rise edge duration of the second traveling wave pulse is outside the target duration interval, then the second traveling wave pulse is not a reflected traveling wave pulse of the target traveling wave pulse.

[0078] Based on S401-S402, ideally, the rising edge duration of the target traveling wave pulse and the rising edge duration of its reflected traveling wave pulse are the same. However, in reality, due to the influence of the complex environment in the transmission line, the rising edge duration of the reflected traveling wave pulse will be slightly different from that of the target traveling wave pulse. Since the midpoint of the target duration interval is the rising edge duration of the target traveling wave pulse, by taking the second traveling wave pulse whose rising edge duration is within the target duration interval as the reflected traveling wave pulse of the target traveling wave pulse, the requirement for the rising edge duration of the reflected traveling wave pulse can be appropriately relaxed, thereby improving the flexibility in determining the reflected traveling wave pulse.

[0079] The above mainly describes the solution provided by the embodiments of this application from the perspective of the fault location determination device executing the fault location determination method. To achieve the above functions, the fault location determination device includes hardware structures and / or software modules corresponding to each function. Those skilled in the art should readily recognize that, in conjunction with the units and algorithm steps of the various examples described in the embodiments disclosed herein, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0080] This application embodiment can divide the fault location determination device into functional modules according to the above method example. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. Optionally, the module division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation. Furthermore, "module" here can refer to an application-specific integrated circuit (ASIC), a circuit, a processor and memory executing one or more software or firmware programs, integrated logic circuits, and / or other devices that can provide the above functions.

[0081] When using functional module division Figure 5 A schematic diagram of a fault location determination device is shown. Figure 5 As shown, the fault location determination device 50 includes an acquisition module 501 and a processing module 502.

[0082] In some embodiments, the fault location determination device 50 may further include a storage module ( Figure 5 (not shown in the image) is used to store program instructions and data.

[0083] When the functions of the above modules are implemented in hardware... Figure 6 A schematic diagram of yet another fault location determination device is shown. (For example...) Figure 6 As shown, the fault location determination device 60 includes a processor 601, a memory 602, and a bus 603. The processor 601 and the memory 602 can be connected via the bus 603.

[0084] Processor 601 is the control center of fault location determination device 60. It can be a single processor or a collective term for multiple processing elements. For example, processor 601 can be a general-purpose central processing unit (CPU) or other general-purpose processors. The general-purpose processor can be a microprocessor or any conventional processor.

[0085] As one embodiment, processor 601 may include one or more CPUs, for example Figure 6 CPU 0 and CPU 1 are shown in the diagram.

[0086] The memory 602 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto.

[0087] In one possible implementation, the memory 602 can exist independently of the processor 601. The memory 602 can be connected to the processor 601 via a bus 603 and is used to store instructions or program code. When the processor 601 calls and executes the instructions or program code stored in the memory 602, it can implement the fault location determination method provided in the embodiments of this application.

[0088] In another possible implementation, the memory 602 can also be integrated with the processor 601.

[0089] Bus 603 can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. This bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 6 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.

[0090] It should be pointed out that, Figure 6 The structure shown does not constitute a limitation on the fault location determination device 60. Except... Figure 6 In addition to the components shown, the fault location determination device 60 may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0091] As an example, combined Figure 5 The functions implemented by the acquisition module 501 and processing module 502 in the fault location determination device 50 are the same as those of the acquisition module 501 and processing module 502. Figure 6 The processor 601 in it has the same function.

[0092] Optional, such as Figure 6 As shown, the fault location determination device 60 provided in this application embodiment may further include a communication interface 604.

[0093] Communication interface 604 is used to connect with other devices via a communication network. This communication network can be Ethernet, a wireless access network, a wireless local area network (WLAN), etc. Communication interface 604 may include a receiving unit for receiving data and a transmitting unit for transmitting data.

[0094] In one possible implementation, the communication interface 604 in the fault location determination device 60 provided in this application embodiment can also be integrated into the processor 601, and this application embodiment does not specifically limit this.

[0095] As a possible product form, the fault location determination device of this application embodiment can also be implemented using the following: one or more field programmable gate arrays (FPGAs), programmable logic devices (PLDs), controllers, state machines, gate logic, discrete hardware components, any other suitable circuits, or any combination of circuits capable of performing the various functions described throughout this application.

[0096] Through the above description of the embodiments, those skilled in the art will clearly understand that, for the sake of convenience and brevity, only the division of the above functional units is used as an example. In practical applications, the above functions can be assigned to different functional units as needed, that is, the internal structure of the device can be divided into different functional units to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0097] This application also provides a computer-readable storage medium storing a computer program or instructions thereon, which, when executed, causes a computer to perform the various steps in the method flow shown in the above method embodiments.

[0098] Embodiments of this application provide a computer program product containing instructions that, when executed on a computer, cause the computer to perform the various steps in the method flow shown in the above-described method embodiments.

[0099] This application provides a chip system, including: a processor and an interface circuit; the interface circuit is used to receive computer programs or instructions and transmit them to the processor; the processor is used to execute the computer programs or instructions so that the chip system performs each step in the method flow shown in the above method embodiments.

[0100] The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), registers, hard disks, optical fibers, compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing, or any other form of computer-readable storage medium in the art. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium may also be a component of the processor. The processor and the storage medium may reside in a purpose-specific ASIC. In the embodiments of this application, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0101] Since the fault location determination device, computer-readable storage medium, and computer program product provided in this embodiment can be applied to the fault location determination method provided in this embodiment, the technical effects they can achieve can also be referred to the above method embodiments. The embodiments of this application will not be repeated here.

[0102] Although this application has been described herein in conjunction with various embodiments, those skilled in the art will understand and implement other variations of the disclosed embodiments by reviewing the accompanying drawings and the disclosure in carrying out the claimed application.

[0103] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely illustrative examples of this application and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of equivalent technology of this application, this application also intends to include such modifications and modifications.

Claims

1. A method for determining fault location, characterized in that, The fault location determination method is applied to a fault location determination device, and the method includes: When the fault location determining device detects a traveling wave pulse on the transmission line, the pulse frequency, pulse rise time, and polarity of each traveling wave pulse in a target time period are acquired; the start time of the target time period is the time when the fault location determining device detects the traveling wave pulse on the transmission line, the duration of the target time period is a preset duration, and the traveling wave pulse is a half-cycle pulse. Based on the pulse frequency, pulse rise time, and polarity of each traveling wave pulse in the plurality of traveling wave pulses, at least one reflected traveling wave pulse of the target traveling wave pulse is determined among the plurality of traveling wave pulses; the target traveling wave pulse is the traveling wave pulse whose wavefront arrives at the fault location determining device earliest among the plurality of traveling wave pulses. The target distance is determined based on a first time point and a second time point; the target distance is the distance between the fault location on the transmission line and the fault location determining device; the first time point is the moment when the wavefront of the target traveling wave pulse arrives at the fault location determining device, the second time point is the moment when the wavefront of the reflected traveling wave pulse arrives at the fault location determining device, and the number of second time points is one or more.

2. The method according to claim 1, characterized in that, The step of determining the reflected traveling wave pulse of the target traveling wave pulse among multiple traveling wave pulses based on the pulse frequency, pulse rise time, and polarity of each traveling wave pulse includes: The traveling wave pulse with the same pulse frequency as the target traveling wave pulse among the multiple traveling wave pulses is taken as the first traveling wave pulse, so as to obtain at least one first traveling wave pulse; At least one second traveling wave pulse is obtained by taking at least one first traveling wave pulse whose polarity is the same as that of the target traveling wave pulse as the second traveling wave pulse. The reflected traveling wave pulse of the target traveling wave pulse in the at least one second traveling wave pulse is determined based on the pulse rise time of at least one second traveling wave pulse and the pulse rise time of the target traveling wave pulse.

3. The method according to claim 2, characterized in that, The step of determining the reflected traveling wave pulse of the target traveling wave pulse among the at least one second traveling wave pulse based on the pulse rise time of at least one second traveling wave pulse and the pulse rise time of the target traveling wave pulse includes: The difference between the rising edge duration of the target traveling wave pulse and the target product is taken as one end of the target duration interval, and the sum of the rising edge duration of the target traveling wave pulse and the target product is taken as the other end of the target duration interval, thus obtaining the target duration interval; the target product is the product of the rising edge duration of the target traveling wave pulse and a preset coefficient, wherein the preset coefficient is less than 1; The second traveling wave pulse whose pulse rise edge duration is within the target duration interval is taken as the reflected traveling wave pulse of the target traveling wave pulse.

4. The method according to claim 1, characterized in that, Obtain the pulse rise time of each traveling wave pulse in multiple traveling wave pulses within the target time period, including: For each traveling wave pulse among multiple traveling wave pulses, the time corresponding to the first amplitude and the time corresponding to the second amplitude in the rising edge of the traveling wave pulse are obtained; the ratio of the first amplitude to the maximum amplitude of the traveling wave pulse is 1 / 10, and the ratio of the second amplitude to the maximum amplitude of the traveling wave pulse is 9 / 10. The difference between the time corresponding to the second amplitude and the time corresponding to the first amplitude is taken as the pulse rise time of the traveling wave pulse.

5. The method according to any one of claims 1-4, characterized in that, When the number of moments in the second time is 1, the target distance is determined based on the first and second moments, including: The target distance is determined based on the first relationship: Where x represents the target distance, Indicates the second moment, V represents the first moment, V represents the wave velocity of the traveling wave pulse, and n represents the order of the reflected traveling wave pulse in the target sequence corresponding to the second moment. The target sequence is the order of the times when the wavefronts of the at least one reflected traveling wave pulse arrive at the fault location determining device from earliest to latest.

6. The method according to claim 5, characterized in that, The reflected traveling wave pulse corresponding to the second moment has the order 1 in the target sequence.

7. The method according to any one of claims 1-4, characterized in that, When there are multiple instances of the second time point, the target distance is determined based on the first and second time points, including: For each of the multiple second time points, determine the initial distance based on the first relation: Where x represents the target distance, Indicates the second moment, V represents the wave velocity of the traveling wave pulse, and n represents the order of the reflected traveling wave pulse in the target sequence corresponding to the second time. The target sequence is the order of the times when the wavefronts of the at least one reflected traveling wave pulse arrive at the fault location determining device from earliest to latest. The average of multiple initial distances is used as the target distance.

8. A fault location determination device, characterized in that, The device includes: an acquisition module and a processing module; The acquisition module is used to acquire the pulse frequency, pulse rise time, and polarity of each traveling wave pulse in a target time period when the fault location determination device detects a traveling wave pulse on the transmission line; the start time of the target time period is the time when the fault location determination device detects a traveling wave pulse on the transmission line, the duration of the target time period is a preset duration, and the traveling wave pulse is a half-cycle pulse. The processing module is used to determine at least one reflected traveling wave pulse of a target traveling wave pulse among the multiple traveling wave pulses based on the pulse frequency, pulse rise time, and polarity of each traveling wave pulse; the target traveling wave pulse is the traveling wave pulse whose wavefront arrives at the fault location determining device earliest among the multiple traveling wave pulses. The processing module is further configured to determine the target distance based on a first time and a second time; the target distance is the distance between the fault location on the transmission line and the fault location determining device; the first time is the moment when the wavefront of the target traveling wave pulse arrives at the fault location determining device, the second time is the moment when the wavefront of the reflected traveling wave pulse arrives at the fault location determining device, and the number of the second time is one or more.

9. A fault location determination device, characterized in that, The fault location determination device includes: a processor coupled to a memory for storing programs or instructions, which, when executed by the processor, cause the device to perform the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, When the computer program or instructions are executed, they cause the computer to perform the method as described in any one of claims 1 to 7.

Images