Multi-port medium voltage distribution network fault location method and device

Abstract

The present application proposes a multi-port medium-voltage distribution network fault locating method, which is applied to a multi-port medium-voltage distribution network, wherein the multi-port medium-voltage distribution network includes a main cable and a branch cable. The method includes: sending a pulse signal to the multi-port medium-voltage distribution network to obtain a traveling wave reflection signal generated by the multi-port medium-voltage distribution network; calculating a distribution network fault factor of the multi-port medium-voltage distribution network according to the signal characteristics of the traveling wave reflection signal; if the distribution network fault factor is less than a preset fault factor threshold, calculating a distribution network fault position determining factor of the multi-port medium-voltage distribution network according to the signal characteristics; if the distribution network fault position determining factor is not less than a preset position determining factor threshold, determining the main line fault position of the main cable according to the signal characteristics; if the distribution network fault position determining factor is less than the position determining factor threshold, determining the branch fault position of the branch cable according to the signal characteristics.

Description

Technical Field

[0001] The present application relates to the field of power systems, and in particular to a method and device for locating faults in a multi-port medium-voltage distribution network. Background Art

[0002] As an important part of the power system, the safety of the medium-voltage distribution network is closely related to the reliability of electricity consumption. The medium-voltage lines of the distribution network are mostly cables, and the operating status of the cables determines the stability and safety of the power system operation. A large amount of data shows that with the increase in the cableization rate of lines, more than 80% of user power outages come from faults in the distribution network. However, in the long-term operation of the medium-voltage distribution network, the cables will inevitably be subjected to multiple effects of the external environment, leading to failures, thereby threatening the safe and stable operation of the power system. At present, there are few studies on the methods of locating faults in multi-port medium-voltage distribution networks. The commonly used fault location methods are aimed at locating single-port distribution network faults, and cannot be directly applied to distribution network fault finding in multi-port situations. The multi-port distribution network lines can only be disassembled one by one for single-line inspection, which greatly reduces the operation and maintenance efficiency and increases the power outage maintenance time. Summary of the invention

[0003] In a first aspect, a multi-port medium voltage distribution network fault location method is applied to a multi-port medium voltage distribution network, wherein the multi-port medium voltage distribution network includes a main cable and a branch cable, and the method includes:

[0004] Sending a pulse signal to a multi-port medium voltage distribution network to obtain a traveling wave reflection signal generated by the multi-port medium voltage distribution network;

[0005] Calculating a distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal;

[0006] If the distribution network fault factor is less than a preset fault factor threshold, calculating a distribution network fault location determination factor of the multi-port medium voltage distribution network according to the signal characteristics;

[0007] If the distribution network fault location determination factor is not less than a preset location determination factor threshold, determining the main line fault location of the main line cable according to the signal characteristics;

[0008] If the distribution network fault location determination factor is less than the location determination factor threshold, the branch fault location of the branch cable is determined according to the signal feature.

[0009] In a second aspect, a multi-port medium voltage distribution network fault location device is provided, which is applied to a multi-port medium voltage distribution network, wherein the multi-port medium voltage distribution network includes a main cable and n branch cables, and the device includes:

[0010] A signal acquisition module, used to send a pulse signal to a multi-port medium voltage distribution network to acquire a traveling wave reflection signal generated by the multi-port medium voltage distribution network;

[0011] A fault factor determination module, used to calculate the distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal;

[0012] A fault location determining factor determining module, configured to calculate a distribution network fault location determining factor of the multi-port medium voltage distribution network according to the signal characteristics if the distribution network fault factor is less than a preset distribution network fault factor threshold;

[0013] A main line fault location determination module, configured to determine the main line fault location of the main line cable according to the signal characteristics if the distribution network fault location determination factor is not less than a preset location determination factor threshold;

[0014] A branch fault location determination module is used to determine the branch fault location of the branch cable according to the signal characteristics if the distribution network fault location determination factor is less than the location determination factor threshold.

[0015] In a third aspect, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the following steps:

[0016] Sending a pulse signal to a multi-port medium voltage distribution network to obtain a traveling wave reflection signal generated by the multi-port medium voltage distribution network;

[0017] Calculating a distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal;

[0018] If the distribution network fault factor is less than a preset distribution network fault factor threshold, calculating a distribution network fault location determination factor of the multi-port medium voltage distribution network according to the signal characteristics;

[0019] If the distribution network fault location determination factor is not less than a preset location determination factor threshold, determining the main line fault location of the main line cable according to the signal characteristics;

[0020] If the distribution network fault location determination factor is less than the location determination factor threshold, the branch fault location of the branch cable is determined according to the signal feature.

[0021] In a fourth aspect, a computer-readable storage medium is provided, storing a computer program, wherein when the computer program is executed by a processor, the processor executes the following steps:

[0022] Sending a pulse signal to a multi-port medium voltage distribution network to obtain a traveling wave reflection signal generated by the multi-port medium voltage distribution network;

[0023] Calculating a distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal;

[0024] If the distribution network fault factor is less than a preset distribution network fault factor threshold, calculating a distribution network fault location determination factor of the multi-port medium voltage distribution network according to the signal characteristics;

[0025] If the distribution network fault location determination factor is not less than a preset location determination factor threshold, determining the main line fault location of the main line cable according to the signal characteristics;

[0026] If the distribution network fault location determination factor is less than the location determination factor threshold, the branch fault location of the branch cable is determined according to the signal feature.

[0027] The present application can achieve the following beneficial effects: after sending a pulse signal to a multi-port medium-voltage distribution network, the present application obtains a traveling wave reflection signal generated by the multi-port medium-voltage distribution network; calculates the distribution network fault factor of the multi-port medium-voltage distribution network according to the signal characteristics of the traveling wave reflection signal; then calculates the distribution network fault location determining factor of the multi-port medium-voltage distribution network according to the signal characteristics; and finally determines whether the fault occurs in the main cable or the branch cable according to the distribution network fault location determining factor. Specifically, if the distribution network fault factor is not less than the preset distribution network fault factor threshold, it means that there is no fault in the multi-port medium-voltage distribution network; if the distribution network fault factor is less than the distribution network fault factor threshold, it means that the multi-port medium-voltage distribution network has a fault, and enters the step of calculating the distribution network fault location determining factor of the multi-port medium-voltage distribution network according to the signal characteristics; if the distribution network fault location determining factor is not less than the preset location determining factor threshold, the main line fault location of the main cable is determined according to the signal characteristics; if the distribution network fault location determining factor is less than the location determining factor threshold, the branch fault location of the branch cable is determined according to the signal characteristics. By obtaining the traveling wave reflection signal and calculating the distribution network fault location determination factor of the multi-port medium-voltage distribution network according to the signal characteristics of the traveling wave reflection signal, the multi-port medium-voltage distribution network can be directly fault-finded without disassembling the multi-port distribution network lines one by one for single-line inspection, which greatly reduces the power outage maintenance time and effectively improves the operation and maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A flowchart of a multi-port medium voltage distribution network fault location method provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of a multi-port medium voltage distribution network fault locating device provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0032] The technical solution of the present application is applicable to overhead distribution lines. Specifically, the technical solution of the present application is applicable to application scenarios for identifying the fault location of a multi-port medium-voltage distribution network. In practical applications, the multi-port medium-voltage distribution network fault location method proposed in the present application injects a pulse signal into the multi-port medium-voltage distribution network through a pulse transmitter, and measures the traveling wave reflection signal generated by the distribution network line. It can identify whether a multi-port medium-voltage distribution network has a fault and the fault location, and realize the judgment and location of the fault situation of the multi-port medium-voltage distribution network with less or no wire removal.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] In one embodiment, Figure 1 As shown, the present application proposes a multi-port medium voltage distribution network fault location method, which is applied to a multi-port medium voltage distribution network, wherein the multi-port medium voltage distribution network includes a main line cable and a branch line cable, and the method includes:

[0035] Step 101: Send a pulse signal to a multi-port medium voltage distribution network to obtain a traveling wave reflection signal generated by the multi-port medium voltage distribution network.

[0036] The multi-port medium voltage distribution network is composed of n+1 cables, including 1 main cable and n branch cables. The main cable is connected to the n branch cables through a ring main unit. The length of the main cable is L0, and the lengths of the branch cables are L1, L2, L3, ..., L n , and L1<L2<L3<…<L n , after injecting a pulse signal into the multi-port medium-voltage distribution network through a pulse transmitter, measuring the traveling wave reflection signal generated by the multi-port medium-voltage distribution network.

[0037] Among them, while measuring the traveling wave reflection signal generated by the multi-port medium voltage distribution network, the signal characteristics of the traveling wave reflection signal can also be determined, including: the number of falling peaks i, the waveform step length R of the falling peak interval il , rising peak interval waveform step length R ju ; Decline peak start time T i1 , falling peak-to-peak time T i2 , the end time of the falling peak is T i3 , the step length of the falling peak starting waveform r i1, the step length of the falling peak-to-peak waveform is r i2 , falling peak termination waveform step length r i3 , the amplitude of the falling peak-to-peak value Ai1, the number of rising peaks j, the starting time of the rising peak T j4 , rising peak time T j5 , rising peak end time T j6 , rising peak starting waveform step length r j4 , rising peak-to-peak waveform step length r j5 , rising peak termination waveform step length r j6 , the amplitude of the rising peak is A j2 ;

[0038] Falling peak interval waveform step R il for:

[0039] R il =r i3 -r i1 :

[0040] Among them, r i3 is the waveform step size of the falling peak at the end, that is, the waveform step size of the falling peak at the end time, r i1 is the waveform step size of the starting waveform of the descending peak, that is, the waveform step size of the descending peak at the starting moment;

[0041] Rising peak interval waveform step R ju for:

[0042] R ju =r j6 -r j4 ;

[0043] Among them, r j6 is the waveform step size of the rising peak at the end, that is, the waveform step size of the rising peak at the end time, r j4 It is the starting waveform step of the rising peak, that is, the waveform step size of the rising peak at the starting moment.

[0044] Step 102: Calculate a distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal.

[0045] The distribution network fault factor is used to describe the possibility of the occurrence of the multi-port medium voltage distribution network fault. For example, if the distribution network fault factor is not less than 3, the multi-port medium voltage distribution network has no fault; if the distribution network fault factor is less than 3, the multi-port medium voltage distribution network has a fault.

[0046] In a specific embodiment, calculating the distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal includes: calculating the distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal and the following distribution network fault factor calculation formula:

[0047]

[0048] Among them, R il is the waveform step length of the descending peak interval, R iu is the waveform step length of the rising peak interval, T j6 is the end time of the rising peak, T j4 is the starting time of the rising peak, T i3 is the end time of the descending peak, T i1 is the starting time of the descending peak, A i1 A is the amplitude at the peak of the decline, j2 is the amplitude at the rising peak, and m is the distribution network fault factor.

[0049] If it is determined that the multi-port medium voltage distribution network has a fault, a distribution network fault location determining factor of the multi-port medium voltage distribution network may be calculated to determine the fault location of the multi-port medium voltage distribution network.

[0050] Step 103: If the distribution network fault factor is less than a preset distribution network fault factor threshold, a distribution network fault location determination factor of the multi-port medium voltage distribution network is calculated according to the signal characteristics.

[0051] The distribution network fault location determination factor is used to describe the possibility that the multi-port medium voltage distribution network fault occurs in the main cable or the branch cable. For example, if the distribution network fault location determination factor is not less than 0, the fault location is in the main cable; if the distribution network fault location determination factor is less than 0, the fault location is in the branch cable.

[0052] In a specific embodiment, the distribution network fault location determining factor of the multi-port medium voltage distribution network is calculated according to the signal characteristics, including: calculating the time deviation factor of the traveling wave reflection signal according to the signal characteristics; calculating the waveform step deviation factor of the traveling wave reflection signal according to the signal characteristics; and calculating the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the time deviation factor and the waveform step deviation factor.

[0053] The time deviation factor is used to indicate the degree of deviation of the traveling wave reflection signal in timing due to a fault. The larger the time deviation factor is, the greater the deviation of the traveling wave reflection signal in timing due to a fault is.

[0054] The waveform step deviation factor is used to indicate the degree of deviation of the waveform step deviation of the traveling wave reflection signal caused by a fault. The larger the waveform step deviation factor is, the greater the degree of deviation of the waveform step deviation of the traveling wave reflection signal is.

[0055] In a specific embodiment, calculating the time deviation factor of the traveling wave reflection signal according to the signal characteristics includes: calculating the time deviation factor of the traveling wave reflection signal according to the signal characteristics and the following time deviation factor calculation formula:

[0056]

[0057] Among them, T j4 is the starting time of the rising peak, T j5 is the peak time of the rising peak, T j6 is the end time of the rising peak, j is the number of rising peaks, and α and β are the calculation weights of the time deviation factor.

[0058] In a specific embodiment, calculating the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the time deviation factor and the waveform step deviation factor includes: calculating the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the time deviation factor, the waveform step deviation factor and the following distribution network fault location determining factor calculation formula:

[0059]

[0060] Among them, C1 is the time deviation factor of the first rising peak, D1 is the waveform step deviation factor of the first rising peak, R 2l is the waveform step length of the second descending peak interval, R 1u is the waveform step length of the first rising peak interval, T 16 is the end time of the first rising peak, T 15 is the peak time of the first rising peak, T 14 is the starting time of the first rising peak, r 16 is the waveform step size of the first rising peak at the end time, r 15 is the waveform step size of the first rising peak at the peak moment, r 14 is the waveform step size of the first rising peak at the starting time, T 23 is the end time of the second descending peak, T 22 is the peak time of the second descending peak, T 21 is the starting time of the second descending peak, r 23 is the waveform step size of the second descending peak at the end time, r 22 is the waveform step size of the second descending peak at the peak moment, r 21is the waveform step size of the second descending peak at the starting time, and p is the distribution network fault location determining factor.

[0061] Step 104: If the distribution network fault location determination factor is not less than a preset location determination factor threshold, determine the main line fault location of the main line cable according to the signal characteristics.

[0062] Among them, after determining the distribution network fault location determining factor, the fault location of the multi-port medium voltage distribution network can be determined according to the distribution network fault location determining factor. If the distribution network fault location determining factor is not less than the preset location determining factor threshold, it means that the fault of the multi-port medium voltage distribution network is in the main cable. For example, if the distribution network fault location determining factor is not less than 0, the fault location is in the main cable. Specifically, the fault location is determined by the signal characteristics and the following main cable fault calculation formula:

[0063]

[0064] Wherein, X0 is the main cable fault position of the multi-port medium voltage distribution network, r 16 is the waveform step size of the first rising peak at the end time, r 15 is the waveform step size of the first rising peak at the peak moment, r 14 is the waveform step size of the first rising peak at the starting time, T 15 is the peak time of the first rising peak, T 22 is the peak time of the second descending peak, r 23 is the waveform step size of the second descending peak at the end time, r 22 is the waveform step size of the second descending peak at the peak moment, r 21 is the waveform step size of the second descending peak at the starting time, and L0 is the cable length of the main cable of the multi-port medium-voltage distribution network.

[0065] After the fault location is determined according to the above main cable fault calculation formula, the fault location on the main cable can be output.

[0066] Step 105: If the distribution network fault location determination factor is less than the location determination factor threshold, determine the branch fault location of the branch cable according to the signal feature.

[0067] Among them, after determining the distribution network fault location determining factor, the fault location of the multi-port medium-voltage distribution network can be judged according to the distribution network fault location determining factor. If the distribution network fault location determining factor is less than the preset location determining factor threshold, it means that the fault of the multi-port medium-voltage distribution network is in the branch cable. If the distribution network fault location determining factor is less than 0, the fault location is in the branch cable. Specifically, half of the branch cables connected to the ring network cabinet are disconnected by binary search, and then tested to calculate the distribution network fault factor of the multi-port medium-voltage distribution network. If the distribution network fault factor is less than the distribution network fault factor threshold, it is determined that the tested branch cable has a fault. If the distribution network fault factor is not less than the distribution network fault factor threshold, it is determined whether the tested branch cable has a fault. For example, if the distribution network fault factor is not less than 3, the tested branch cable has no fault; if the distribution network fault factor is less than 3, the tested branch cable has a fault. The binary method is used for multiple tests, and the distribution network fault factor is calculated for fault judgment, and the fault branch cable L of the multi-port medium voltage distribution network is gradually determined. c :

[0068] Calculation of branch cable L c The fault location X1 is:

[0069]

[0070] Where X1 is the fault location of the branch cable of the multi-port medium voltage distribution network, r 16 is the waveform step size of the first rising peak at the end time, r 15 is the waveform step size of the first rising peak at the peak moment, r 14 is the waveform step size of the first rising peak at the starting time, T 15 is the peak time of the first rising peak, T c2 is the peak time of the cth descending peak, r c3 is the waveform step length of the cth descending peak at the end time, r c2 is the waveform step length of the cth descending peak at the peak moment, r c1 is the waveform step length of the cth descending peak at the starting time, L c is the cable length of the branch cable of the multi-port medium-voltage distribution network, and L0 is the cable length of the main cable of the multi-port medium-voltage distribution network.

[0071] The present application obtains the traveling wave reflection signal generated by the multi-port medium-voltage distribution network after sending a pulse signal to the multi-port medium-voltage distribution network; calculates the distribution network fault factor of the multi-port medium-voltage distribution network according to the signal characteristics of the traveling wave reflection signal; then calculates the distribution network fault location determination factor of the multi-port medium-voltage distribution network according to the signal characteristics; and finally determines whether the fault occurs in the main cable or the branch cable according to the distribution network fault location determination factor. Specifically, if the distribution network fault factor is not less than the preset distribution network fault factor threshold, it means that there is no fault in the multi-port medium-voltage distribution network; if the distribution network fault factor is less than the distribution network fault factor threshold, it means that the multi-port medium-voltage distribution network has a fault, and enters the step of calculating the distribution network fault location determination factor of the multi-port medium-voltage distribution network according to the signal characteristics; if the distribution network fault location determination factor is not less than the preset location determination factor threshold, the main line fault location of the main cable is determined according to the signal characteristics; if the distribution network fault location determination factor is less than the location determination factor threshold, the branch fault location of the branch cable is determined according to the signal characteristics. By obtaining the traveling wave reflection signal and calculating the distribution network fault location determination factor of the multi-port medium-voltage distribution network according to the signal characteristics of the traveling wave reflection signal, the multi-port medium-voltage distribution network can be directly fault-finded without disassembling the multi-port distribution network lines one by one for single-line inspection, which greatly reduces the power outage maintenance time and effectively improves the operation and maintenance efficiency.

[0072] In one embodiment, Figure 2 As shown, the present application proposes a multi-port medium-voltage distribution network fault location device, which is applied to a multi-port medium-voltage distribution network. The multi-port medium-voltage distribution network includes a main cable and n branch cables. The device includes:

[0073] The signal acquisition module 201 is used to send a pulse signal to a multi-port medium voltage distribution network to acquire a traveling wave reflection signal generated by the multi-port medium voltage distribution network.

[0074] A fault factor determination module 202, configured to calculate a distribution network fault factor of the multi-port medium voltage distribution network according to a signal characteristic of the traveling wave reflection signal;

[0075] The fault location determining factor determining module 203 is configured to calculate the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the signal characteristics if the distribution network fault factor is less than a preset distribution network fault factor threshold.

[0076] The main line fault location determination module 204 is configured to determine the main line fault location of the main line cable according to the signal characteristics if the distribution network fault location determination factor is not less than a preset location determination factor threshold.

[0077] The branch fault location determination module 205 is configured to determine the branch fault location of the branch cable according to the signal feature if the distribution network fault location determination factor is less than the location determination factor threshold.

[0078] like Figure 3 As shown in one embodiment, it is an internal structure diagram of a computer device. The computer device may be a multi-port medium voltage distribution network fault location device, or a terminal or server connected to a multi-port medium voltage distribution network fault location device. Figure 3 As shown, the computer device includes a processor, a memory, and a network interface connected via a system bus. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program. When the computer program is executed by the processor, the processor may implement a multi-port medium-voltage distribution network fault location method. The internal memory may also store a computer program. When the computer program is executed by the processor, the processor may implement a multi-port medium-voltage distribution network fault location method. The network interface is used to communicate with an external device. Those skilled in the art will understand that Figure 3 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0079] In one embodiment, a multi-port medium voltage distribution network fault location method provided by the present application can be implemented in the form of a computer program. The computer program can be Figure 3 The computer device shown in the figure is run. The memory of the computer device can store various program templates that constitute the indoor positioning device. For example, the signal acquisition module 201, the fault factor determination module 202, the fault location determination factor determination module 203, the main road fault location determination module 204, and the branch road fault location determination module 205.

[0080] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the following steps: sending a pulse signal to a multi-port medium-voltage distribution network to obtain a traveling wave reflection signal generated by the multi-port medium-voltage distribution network; calculating a distribution network fault factor of the multi-port medium-voltage distribution network according to the signal characteristics of the traveling wave reflection signal; if the distribution network fault factor is less than a preset distribution network fault factor threshold, calculating a distribution network fault location determination factor of the multi-port medium-voltage distribution network according to the signal characteristics; if the distribution network fault location determination factor is not less than a preset location determination factor threshold, determining the main line fault location of the main cable according to the signal characteristics; if the distribution network fault location determination factor is less than the location determination factor threshold, determining the branch line fault location of the branch cable according to the signal characteristics.

[0081] In one embodiment, the calculating the distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal includes: calculating the distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal and the following distribution network fault factor calculation formula:

[0082]

[0083] Among them, R il is the waveform step length of the descending peak interval, R iu is the waveform step length of the rising peak interval, T j6 is the end time of the rising peak, T j4 is the starting time of the rising peak, T i3 is the end time of the descending peak, T i1 is the starting time of the descending peak, A i1 A is the amplitude at the peak of the decline, j2 is the amplitude at the rising peak, and m is the distribution network fault factor.

[0084] In one embodiment, the calculation of the distribution network fault location determination factor of the multi-port medium voltage distribution network based on the signal characteristics includes: calculating the time deviation factor of the traveling wave reflection signal based on the signal characteristics; calculating the waveform step deviation factor of the traveling wave reflection signal based on the signal characteristics; and calculating the distribution network fault location determination factor of the multi-port medium voltage distribution network based on the time deviation factor and the waveform step deviation factor.

[0085] In one embodiment, the calculating the time deviation factor of the traveling wave reflection signal according to the signal characteristics includes: calculating the time deviation factor of the traveling wave reflection signal according to the signal characteristics and the following time deviation factor calculation formula:

[0086]

[0087] Among them, T j4 is the starting time of the rising peak, T j5 is the peak time of the rising peak, T j6 is the end time of the rising peak, j is the number of rising peaks, and α and β are the calculation weights of the time deviation factor.

[0088] In one embodiment, the step of calculating the waveform step deviation factor of the traveling wave reflection signal according to the signal characteristics comprises: calculating the waveform step deviation factor of the traveling wave reflection signal according to the signal characteristics and the following waveform step deviation factor calculation formula:

[0089]

[0090] Among them, r j4 is the waveform step length at the beginning of the rising peak, r j5 is the waveform step length of the rising peak, r j6 is the waveform step length at which the rising peak terminates, j is the number of rising peaks, and a and b are the calculation weights of the waveform step length deviation factor.

[0091] In one embodiment, the calculating of the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the time deviation factor and the waveform step deviation factor includes: calculating the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the time deviation factor, the waveform step deviation factor and the following distribution network fault location determining factor calculation formula:

[0092]

[0093] Among them, C1 is the time deviation factor of the first rising peak, D1 is the waveform step deviation factor of the first rising peak, R 2l is the waveform step length of the second descending peak interval, R 1u is the waveform step length of the first rising peak interval, T 16 is the end time of the first rising peak, T 15 is the peak time of the first rising peak, T 14 is the starting time of the first rising peak, r 16 is the waveform step size of the first rising peak at the end time, r 15 is the waveform step size of the first rising peak at the peak moment, r 14 is the waveform step size of the first rising peak at the starting time, T 23 is the end time of the second descending peak, T 22 is the peak time of the second descending peak, T 21 is the starting time of the second descending peak, r 23 is the waveform step size of the second descending peak at the end time, r22 is the waveform step size of the second descending peak at the peak moment, r 21 is the waveform step size of the second descending peak at the starting time, and p is the distribution network fault location determining factor.

[0094] A computer-readable storage medium stores a computer program, which, when executed by a processor, causes the processor to perform the following steps: sending a pulse signal to a multi-port medium-voltage distribution network to obtain a traveling wave reflection signal generated by the multi-port medium-voltage distribution network; calculating a distribution network fault factor of the multi-port medium-voltage distribution network according to the signal characteristics of the traveling wave reflection signal; if the distribution network fault factor is less than a preset distribution network fault factor threshold, calculating a distribution network fault location determination factor of the multi-port medium-voltage distribution network according to the signal characteristics; if the distribution network fault location determination factor is not less than a preset location determination factor threshold, determining the main line fault location of the main cable according to the signal characteristics; if the distribution network fault location determination factor is less than the location determination factor threshold, determining the branch line fault location of the branch cable according to the signal characteristics.

[0095] In one embodiment, the calculating the distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal includes: calculating the distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal and the following distribution network fault factor calculation formula:

[0096]

[0097] Among them, R il is the waveform step length of the descending peak interval, R iu is the waveform step length of the rising peak interval, T j6 is the end time of the rising peak, T j4 is the starting time of the rising peak, T i3 is the end time of the descending peak, T i1 is the starting time of the descending peak, A i1 A is the amplitude at the peak of the decline, j2 is the amplitude at the rising peak, and m is the distribution network fault factor.

[0098] In one embodiment, the calculation of the distribution network fault location determination factor of the multi-port medium voltage distribution network based on the signal characteristics includes: calculating the time deviation factor of the traveling wave reflection signal based on the signal characteristics; calculating the waveform step deviation factor of the traveling wave reflection signal based on the signal characteristics; and calculating the distribution network fault location determination factor of the multi-port medium voltage distribution network based on the time deviation factor and the waveform step deviation factor.

[0099] In one embodiment, the calculating the time deviation factor of the traveling wave reflection signal according to the signal characteristics includes: calculating the time deviation factor of the traveling wave reflection signal according to the signal characteristics and the following time deviation factor calculation formula:

[0100]

[0101] Among them, T j4 is the starting time of the rising peak, T j5 is the peak time of the rising peak, T j6 is the end time of the rising peak, j is the number of rising peaks, and α and β are the calculation weights of the time deviation factor.

[0102] In one embodiment, the step of calculating the waveform step deviation factor of the traveling wave reflection signal according to the signal characteristics comprises: calculating the waveform step deviation factor of the traveling wave reflection signal according to the signal characteristics and the following waveform step deviation factor calculation formula:

[0103]

[0104] Among them, r j4 is the waveform step length at the beginning of the rising peak, r j5 is the waveform step length of the rising peak, r j6 is the waveform step length at which the rising peak terminates, j is the number of rising peaks, and a and b are the calculation weights of the waveform step length deviation factor.

[0105] In one embodiment, the calculating of the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the time deviation factor and the waveform step deviation factor includes: calculating the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the time deviation factor, the waveform step deviation factor and the following distribution network fault location determining factor calculation formula:

[0106]

[0107] Among them, C1 is the time deviation factor of the first rising peak, D1 is the waveform step deviation factor of the first rising peak, R 2l is the waveform step length of the second descending peak interval, R 1u is the waveform step length of the first rising peak interval, T 16 is the end time of the first rising peak, T 15 is the peak time of the first rising peak, T 14 is the starting time of the first rising peak, r 16 is the waveform step size of the first rising peak at the end time, r 15 is the waveform step size of the first rising peak at the peak moment, r 14is the waveform step size of the first rising peak at the starting time, T 23 is the end time of the second descending peak, T 22 is the peak time of the second descending peak, T 21 is the starting time of the second descending peak, r 23 is the waveform step size of the second descending peak at the end time, r 22 is the waveform step size of the second descending peak at the peak moment, r 21 is the waveform step size of the second descending peak at the starting time, and p is the distribution network fault location determining factor.

[0108] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0109] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A multi-port medium voltage distribution network fault location method, characterized in that: Applied to a multi-port medium voltage distribution network, the multi-port medium voltage distribution network includes a main cable and a branch cable, the method includes: Sending a pulse signal to a multi-port medium voltage distribution network to obtain a traveling wave reflection signal generated by the multi-port medium voltage distribution network; Calculating the distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal, comprising: calculating the distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal and the following distribution network fault factor calculation formula: Among them, R il is the waveform step length of the descending peak interval, R iu is the waveform step length of the rising peak interval, T j6 is the end time of the rising peak, T j4 is the starting time of the rising peak, T i3 is the end time of the descending peak, T i1 is the starting time of the descending peak, A i1 A is the amplitude at the peak of the decline, j2 is the amplitude at the rising peak, m is the distribution network fault factor; If the distribution network fault factor is less than a preset distribution network fault factor threshold, the distribution network fault location determining factor of the multi-port medium voltage distribution network is calculated according to the signal characteristics, including: calculating the time deviation factor of the traveling wave reflection signal according to the signal characteristics; calculating the waveform step deviation factor of the traveling wave reflection signal according to the signal characteristics; calculating the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the time deviation factor and the waveform step deviation factor; If the distribution network fault location determination factor is not less than a preset location determination factor threshold, determining the main line fault location of the main line cable according to the signal characteristics; If the distribution network fault location determination factor is less than the location determination factor threshold, the branch fault location of the branch cable is determined according to the signal feature.

2. The method according to claim 1, characterized in that The calculating the time deviation factor of the traveling wave reflection signal according to the signal characteristic comprises: The time deviation factor of the traveling wave reflection signal is calculated according to the signal characteristics and the following time deviation factor calculation formula: Among them, T j4 is the starting time of the rising peak, T j5 is the peak time of the rising peak, T j6 is the end time of the rising peak, j is the number of rising peaks, and α and β are the calculation weights of the time deviation factor.

3. The method according to claim 1, characterized in that The step of calculating the waveform step deviation factor of the traveling wave reflection signal according to the signal characteristics comprises: The waveform step deviation factor of the traveling wave reflection signal is calculated according to the signal characteristics and the following waveform step deviation factor calculation formula: Among them, r j4 is the waveform step length at the beginning of the rising peak, r j5 is the waveform step length of the rising peak, r j6 is the waveform step length at which the rising peak terminates, j is the number of rising peaks, and a and b are the calculation weights of the waveform step length deviation factor.

4. The method according to claim 1, characterized in that: The calculating the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the time deviation factor and the waveform step deviation factor comprises: The distribution network fault location determining factor of the multi-port medium voltage distribution network is calculated according to the time deviation factor, the waveform step deviation factor and the following distribution network fault location determining factor calculation formula: Among them, C1 is the time deviation factor of the first rising peak, D1 is the waveform step deviation factor of the first rising peak, R 2l is the waveform step length of the second descending peak interval, R 1u is the waveform step length of the first rising peak interval, T 16 is the end time of the first rising peak, T 15 is the peak time of the first rising peak, T 14 is the starting time of the first rising peak, r 16 is the waveform step size of the first rising peak at the end time, r 15 is the waveform step size of the first rising peak at the peak moment, r 14 is the waveform step size of the first rising peak at the starting time, T 23 is the end time of the second descending peak, T 22 is the peak time of the second descending peak, T 21 is the starting time of the second descending peak, r 23 is the waveform step size of the second descending peak at the end time, r 22 is the waveform step size of the second descending peak at the peak moment, r 21 is the waveform step size of the second descending peak at the starting time, and p is the distribution network fault location determining factor.

5. A multi-port medium voltage distribution network fault location device, characterized in that: Applicable to a multi-port medium voltage distribution network, the multi-port medium voltage distribution network includes a main cable and n branch cables, the device includes: A signal acquisition module, used to send a pulse signal to a multi-port medium voltage distribution network to acquire a traveling wave reflection signal generated by the multi-port medium voltage distribution network; A fault factor determination module is used to calculate the distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal, including: calculating the distribution network fault factor of the multi-port medium voltage distribution network according to the signal characteristics of the traveling wave reflection signal and the following distribution network fault factor calculation formula: Among them, R il is the waveform step length of the descending peak interval, R iu is the waveform step length of the rising peak interval, T j6 is the end time of the rising peak, T j4 is the starting time of the rising peak, T i3 is the end time of the descending peak, T i1 is the starting time of the descending peak, A i1 A is the amplitude at the peak of the decline, j2 is the amplitude at the rising peak, m is the distribution network fault factor; A fault location determining factor determination module is used to calculate the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the signal characteristics if the distribution network fault factor is less than a preset distribution network fault factor threshold, including: calculating the time deviation factor of the traveling wave reflection signal according to the signal characteristics; calculating the waveform step deviation factor of the traveling wave reflection signal according to the signal characteristics; calculating the distribution network fault location determining factor of the multi-port medium voltage distribution network according to the time deviation factor and the waveform step deviation factor; A main line fault location determination module, configured to determine the main line fault location of the main line cable according to the signal characteristics if the distribution network fault location determination factor is not less than a preset location determination factor threshold; A branch fault location determination module is used to determine the branch fault location of the branch cable according to the signal characteristics if the distribution network fault location determination factor is less than the location determination factor threshold.

6. A computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method according to claims 1 to 4.

7. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor is caused to execute the steps of the method according to claims 1 to 4.

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