Power transmission line fault point positioning method, device and system based on signal injection

Abstract

The invention relates to the field of power, and discloses a power transmission line fault point positioning method, device and system based on signal injection, and the method comprises the steps: determining a fault feature, a first signal amplitude of a first end of a fault line, and a second signal amplitude of a second end of the fault line based on a fault signal fed back by a non-contact distributed traveling wave positioning device; determining an injection point and traveling wave signal characteristics of the coupled traveling wave generating equipment according to the fault characteristics, and controlling the coupled traveling wave generating equipment to inject a test traveling wave signal at the injection point according to the traveling wave signal characteristics; determining a third signal amplitude of the first end of the faulty line and a fourth signal amplitude of the second end of the faulty line based on a test signal fed back by the non-contact distributed traveling wave positioning equipment; adjusting the injection point to enable the test ratio of the third signal amplitude to the fourth signal amplitude to be equal to the fault ratio of the first signal amplitude to the second signal amplitude; and obtaining geographic space information fed back by the coupling traveling wave generation equipment after the injection point is adjusted, and determining the geographic space information as a fault point.

Description

Technical Field

[0001] The present invention relates to the technical fields of electric power and signal processing, and particularly to a method, device and system for locating a fault point of a transmission line based on signal injection. Background Art

[0002] With the large-scale application of UHV transmission technology, modern power grids have put forward higher requirements for the accuracy and efficiency of transmission line fault detection. The current mainstream distributed transmission line fault detection system adopts a "two-stage positioning" architecture: in the first stage, fault distance measurement is realized by the traveling wave method or the impedance method, and in the second stage, precise positioning is carried out in combination with transmission line parameters. The traveling wave method can be specifically divided into two types of distance measurement methods: double-ended (using the time difference of the fault traveling wave arriving at both ends of the substation) and single-ended (using the reflection and refraction characteristics of the traveling wave). The traveling wave method mainly uses non-contact traveling wave positioning equipment.

[0003] Although the existing methods can realize the detection of transmission line faults, there are still some problems to be solved urgently.

[0004] In the scenario of cross-regional long-distance power transmission (such as ±800kV UHV DC line), the transmission line is relatively long. Due to the complex line topology structure, lagging update of topology data, unclear tower coordinates, and low digitization degree of tower coordinates (35% of the towers lack geographical information system coordinate records), it is only possible to locate the abstract electrical distance of the fault point (such as "127.3km from the starting substation"), and it is impossible to accurately locate the actual geographical location (longitude / latitude). Without the mapping relationship between the electrical distance and the actual geographical location, the maintenance personnel need to carry out manual conversion in combination with paper ledgers, which is time-consuming and laborious to find the fault point, and the efficiency is low.

[0005] In view of the above problems, there is an urgent need to propose a method for locating a fault point of a transmission line based on signal injection to achieve accurate positioning of the actual geographical location of the fault point. Summary of the Invention

[0006] The present invention provides a method, device and system for locating a fault point of a transmission line based on signal injection, aiming to solve the problem of low efficiency of fault point positioning caused by unclear line topology, unclear tower numbers, etc. in the prior art. Through signal injection and traveling wave analysis technology, accurate positioning of the actual geographical location of the fault point is realized, and the accuracy and efficiency of fault troubleshooting are improved.

[0007] In a first aspect, a method for locating a fault point of a transmission line based on signal injection is provided, and the method includes:

[0008] Based on the fault signal fed back by the non-contact distributed traveling wave positioning device, determining the fault characteristics of the fault line, the first signal amplitude at the first end of the fault line, and the second signal amplitude at the second end of the fault line;

[0009] According to the fault characteristics, determine the injection point of the coupled traveling wave generating device and the traveling wave signal characteristics, and control the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the traveling wave signal characteristics;

[0010] Based on the test signal fed back by the non-contact distributed traveling wave positioning device, determine the third signal amplitude at the first end of the faulty line and the fourth signal amplitude at the second end of the faulty line;

[0011] Adjust the injection point so that the test ratio of the third signal amplitude to the fourth signal amplitude is equal to the fault ratio of the first signal amplitude to the second signal amplitude;

[0012] Obtain the geospatial information fed back by the coupled traveling wave generating device after adjusting the injection point, and determine the geospatial information as the fault point.

[0013] In a second aspect, a transmission line fault point positioning device based on signal injection is provided. The device includes:

[0014] An acquisition unit, configured to determine the fault characteristics of the faulty line, the first signal amplitude at the first end of the faulty line, and the second signal amplitude at the second end of the faulty line based on the fault signal fed back by the non-contact distributed traveling wave positioning device;

[0015] A control unit, configured to determine the injection point of the coupled traveling wave generating device and the traveling wave signal characteristics according to the fault characteristics, and control the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the traveling wave signal characteristics;

[0016] The acquisition unit is further configured to determine the third signal amplitude at the first end of the faulty line and the fourth signal amplitude at the second end of the faulty line based on the test signal fed back by the non-contact distributed traveling wave positioning device;

[0017] The control unit is further configured to adjust the injection point so that the test ratio of the third signal amplitude to the fourth signal amplitude is equal to the fault ratio of the first signal amplitude to the second signal amplitude;

[0018] A positioning unit, configured to obtain the geospatial information fed back by the coupled traveling wave generating device after adjusting the injection point, and determine the geospatial information as the fault point.

[0019] In a third aspect, a transmission line fault point positioning system based on signal injection is provided. The system includes: a non-contact distributed traveling wave positioning device, a transmission line fault point positioning device based on signal injection, and a coupled traveling wave generating device;

[0020] The non-contact distributed traveling wave positioning device is configured to obtain a fault signal and a test signal, and send the fault signal and the test signal to the transmission line fault point positioning device based on signal injection;

[0021] A coupled traveling wave generating device, which is used to inject a test traveling wave signal under the control of a transmission line fault point positioning device based on signal injection;

[0022] The coupled traveling wave generating device is also used to send geospatial information to a transmission line fault point positioning device based on signal injection;

[0023] A transmission line fault point positioning device based on signal injection, which is used to implement the steps of the above-mentioned transmission line fault point positioning method based on signal injection.

[0024] In a fourth aspect, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned transmission line fault point positioning method based on signal injection are implemented.

[0025] In a fifth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned transmission line fault point positioning method based on signal injection are implemented.

[0026] In the solution implemented by the above-mentioned transmission line fault point positioning method, device and system based on signal injection, based on the fault signal fed back by the non-contact distributed traveling wave positioning device, determine the fault characteristics of the fault line, the first signal amplitude at the first end of the fault line, and the second signal amplitude at the second end of the fault line; according to the fault characteristics, determine the injection point and the traveling wave signal characteristics of the coupled traveling wave generating device, and control the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the traveling wave signal characteristics; based on the test signal fed back by the non-contact distributed traveling wave positioning device, determine the third signal amplitude at the first end of the fault line and the fourth signal amplitude at the second end of the fault line; adjust the injection point so that the test ratio of the third signal amplitude to the fourth signal amplitude is equal to the fault ratio of the first signal amplitude to the second signal amplitude; obtain the geospatial information of the coupled traveling wave generating device after adjusting the injection point, and determine the geospatial information as the fault point.

[0027] By injecting a specific test traveling wave signal during a transmission line fault, the present invention can locate the fault point by adjusting the injection point, and achieve precise positioning of the actual geographical location of the transmission line fault point. The method proposed by the present invention solves the problem that when the transmission line is long and there are situations such as unclear line topology and unclear pole numbers, only the abstract electrical distance of the fault point can be located, and the actual geographical location cannot be accurately located. The operation and maintenance personnel can directly use the actual geographical location of the fault point to find the fault point, which speeds up the fault point search speed, avoids blind patrol, can simply, quickly and accurately determine the single-phase grounding fault point, and reduces the labor intensity of the distribution line maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0029] Figure 1 It is a schematic flowchart of a method for locating a fault point on a transmission line based on signal injection in an embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of an implementation scenario of a method for locating a fault point on a transmission line based on signal injection in an embodiment of the present invention;

[0031] Figure 3 It is a schematic flowchart of a method for locating a fault point on a transmission line based on signal injection in another embodiment of the present invention;

[0032] Figure 4 It is a schematic structural diagram of a device for locating a fault point on a transmission line based on signal injection in an embodiment of the present invention;

[0033] Figure 5 It is a schematic structural diagram of a system for locating a fault point on a transmission line based on signal injection in an embodiment of the present invention;

[0034] Figure 6 It is a schematic structural diagram of a computer device in an embodiment of the present invention. Detailed implementation manners

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0036] The concept of the present invention lies in: in the scenario of long-distance cross-regional power transmission, the transmission line is relatively long. Due to complex line topologies, lagging topology data updates, unclear tower coordinates, and low digitization levels of tower coordinates, etc., only the abstract electrical distance of the fault point can be located, and the actual geographical location cannot be accurately located. The present invention realizes the accurate positioning of the actual geographical location of the fault point through signal injection and traveling wave analysis technologies, improving the accuracy and efficiency of fault troubleshooting.

[0037] The fault point location method for transmission lines based on signal injection provided by the embodiments of the present invention can be applied to a fault point location device for transmission lines based on signal injection. The location device is communicatively connected to a non-contact distributed traveling wave location device and is also communicatively connected to a coupled traveling wave generating device.

[0038] The non-contact distributed traveling wave location device may include a plurality of non-contact traveling wave sensors. The plurality of non-contact traveling wave sensors are distributed and installed at different positions of the transmission line, and can capture the fault signals generated during single-phase grounding faults of the transmission line. Based on the communication connection between the non-contact distributed traveling wave location device and the location device, the non-contact distributed traveling wave location device sends the fault signals to the location device.

[0039] After receiving the fault signals, the location device performs traveling wave analysis based on the fault signals to determine the fault characteristics of the fault line, the first signal amplitude at the first end of the fault line, and the second signal amplitude at the second end of the fault line. The location device determines the injection point and the traveling wave signal characteristics of the coupled traveling wave generating device according to the fault characteristics. Based on the communication connection between the coupled traveling wave generating device and the location device, the location device sends the injection point and the traveling wave signal characteristics to the coupled traveling wave generating device.

[0040] The coupled traveling wave generating device is controlled by the location device to inject a test traveling wave signal with the traveling wave signal characteristics into the fault line at the injection point. The coupled traveling wave generating device is also equipped with a spatial positioning module to collect the geospatial information of the coupled traveling wave generating device in real time. The geospatial information reflects the actual geographical location of the injection point of the coupled traveling wave generating device, and sends the geospatial information to the location device.

[0041] After the coupled traveling wave generating device injects the test traveling wave signal into the fault line, the non-contact distributed traveling wave location device continues to capture the test signals of the transmission line and sends the test signals to the location device.

[0042] After receiving the test signals, the location device performs traveling wave analysis based on the test signals to determine the third signal amplitude at the first end of the fault line and the fourth signal amplitude at the second end of the fault line. The location device calculates the test ratio of the third signal amplitude to the fourth signal amplitude and the fault ratio of the first signal amplitude to the second signal amplitude, and compares the test ratio with the fault ratio, and adjusts the injection point of the coupled traveling wave generating device with the goal that the test ratio is equal to the fault ratio.

[0043] When the test ratio is equal to the fault ratio, the adjustment ends. At this time, the geospatial information collected by the coupled traveling wave generating device is the actual geographical location of the fault point of the transmission line. The coupled traveling wave generating device sends the geospatial information at the end of the adjustment to the location device. The location device determines the geospatial information as the fault point of the transmission line.

[0044] In one embodiment, a method for locating a fault point on a transmission line based on signal injection is provided. Please refer to Figure 1 and Figure 2 as shown Figure 1 FIG. is a schematic flowchart of a method for locating a fault point on a transmission line based on signal injection provided by an embodiment of the present invention, Figure 2 and FIG. is a schematic diagram of an implementation scenario of a method for locating a fault point on a transmission line based on signal injection according to an embodiment of the present invention. The method for locating a fault point on a transmission line based on signal injection includes the following steps:

[0045] Step S110: Based on the fault signal fed back by the non-contact distributed traveling wave positioning device, determine the fault characteristics of the fault line, the first signal amplitude at the first end of the fault line, and the second signal amplitude at the second end of the fault line.

[0046] The distributed non-contact traveling wave positioning device may include a plurality of non-contact traveling wave sensors, and the plurality of non-contact traveling wave sensors may be distributedly installed on the poles and towers of the transmission line. Each non-contact traveling wave sensor can send a fault signal to the positioning device. The fault signal may include, but is not limited to, the traveling wave waveform of each non-contact traveling wave sensor, etc.

[0047] As Figure 2 illustrated: Five non-contact traveling wave sensors are distributedly installed on the transmission line, and each non-contact traveling wave sensor sends the fault signal it respectively collects to the positioning device.

[0048] After receiving the fault signal, the positioning device can clearly determine whether a single-phase ground fault has occurred on the transmission line based on the traveling wave analysis of the fault signals sent by each non-contact traveling wave sensor. When a single-phase ground fault occurs on the transmission line, further analyze the fault characteristics, which may include, but are not limited to, the fault section, the main frequency, the fault phase, etc.

[0049] As Figure 2 illustrated: The positioning device determines that a single-phase ground fault has occurred on the transmission line, further analyzes that the fault section is between the third non-contact traveling wave sensor and the fourth non-contact traveling wave sensor, and simultaneously determines the main frequency and the fault phase (such as phase A).

[0050] The positioning device also calculates the first signal amplitude at the first end of the fault line and the second signal amplitude at the second end of the fault line. The first end and the second end of the fault line are relative concepts, and the first end and the second end of the fault line together form both ends of the fault section.

[0051] As Figure 2Illustrated example: Since the positioning device determines that the fault section is between the non-contact traveling wave sensor three and the non-contact traveling wave sensor four, the non-contact traveling wave sensor three can be used as the first end (M end) of the fault line, and the non-contact traveling wave sensor four can be used as the second end (N end) of the fault line. The positioning device calculates the first signal amplitude based on the fault signal sent by the non-contact traveling wave sensor three, and calculates the second signal amplitude based on the fault signal sent by the non-contact traveling wave sensor four.

[0052] Step S120, according to the fault characteristics, determine the injection point and the traveling wave signal characteristics of the coupled traveling wave generating device, and control the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the traveling wave signal characteristics.

[0053] After the positioning device analyzes the fault characteristics based on the fault signal, it further analyzes the injection parameters of the coupled traveling wave generating device based on the fault characteristics. The injection parameters can include but are not limited to: the injection point and the traveling wave signal characteristics. The traveling wave signal characteristics can include but are not limited to: the injection frequency, the injection phase, etc. After the positioning device determines the injection parameters, it controls the coupled traveling wave generating device to inject a test traveling wave signal according to the injection parameters.

[0054] For example: The positioning device can determine the fault section based on the fault signal received from the non-contact distributed traveling wave positioning device, determine a point within the fault section as the injection point, and control the coupled traveling wave generating device to inject a test current traveling wave signal. The positioning device can determine the main frequency based on the fault signal received from the non-contact distributed traveling wave positioning device, and control the coupled traveling wave generating device to inject a test current traveling wave signal with the magnitude of the main frequency into the single-phase grounding fault line. The positioning device can determine the fault phase based on the fault signal received from the non-contact distributed traveling wave positioning device. When controlling the coupled traveling wave generating device to inject a test current traveling wave signal into the single-phase grounding fault line, one of the non-fault phases is adopted (for example, if the fault phase is phase A, the injection phase is phase B or phase C).

[0055] As Figure 2 Illustrated example: The coupled traveling wave generating device injects a test traveling wave signal at the injection point with the traveling wave signal characteristics.

[0056] Step S130, based on the test signal fed back by the non-contact distributed traveling wave positioning device, determine the third signal amplitude at the first end of the fault line and the fourth signal amplitude at the second end of the fault line.

[0057] After the coupled traveling wave generating device injects a test traveling wave signal into the fault line, the non-contact distributed traveling wave positioning device continues to send a test signal to the positioning device. The test signal can include but are not limited to: the traveling wave waveforms of each non-contact traveling wave sensor after injecting the test traveling wave signal, etc. The positioning device focuses on analyzing the test traveling wave signals sent by the non-contact traveling wave sensors at both ends of the fault section.

[0058] As Figure 2 shown in the example: Since the positioning device determines that the fault section is between the non-contact traveling wave sensor three and the non-contact traveling wave sensor four, the positioning device calculates the third signal amplitude based on the test signal sent by the non-contact traveling wave sensor three, and calculates the fourth signal amplitude based on the test signal sent by the non-contact traveling wave sensor four.

[0059] Step S140, adjust the injection point so that the test ratio of the third signal amplitude to the fourth signal amplitude is equal to the fault ratio of the first signal amplitude to the second signal amplitude.

[0060] The positioning device calculates the magnitudes of the first signal amplitude and the second signal amplitude before the injection of the test traveling wave signal (i.e., at the time of the fault), and calculates the ratio of the first signal amplitude to the second signal amplitude as the fault ratio.

[0061] The positioning device calculates the magnitudes of the third signal amplitude and the fourth signal amplitude after the injection of the test traveling wave signal (i.e., during the test), and calculates the ratio of the third signal amplitude to the fourth signal amplitude as the test ratio.

[0062] Since the injection point is a point determined by the positioning device based on the fault characteristics (especially the fault section), it is impossible to ensure that the determined injection point is the fault point. Therefore, it is necessary to adjust the injection point based on the first signal amplitude, the second signal amplitude, the third signal amplitude, and the fourth signal amplitude. The adjustment objective is: the fault ratio is equal to the test ratio.

[0063] As Figure 2 shown in the example, the injection point of the coupled traveling wave generating device is adjusted within the fault section, and the test traveling wave signal is continuously injected. Once the positioning device calculates that when the coupled traveling wave generating device injects the test traveling wave signal at the adjusted injection point, the fault ratio is equal to the test ratio, the adjustment ends.

[0064] Step S150, obtain the geospatial information of the coupled traveling wave generating device after adjusting the injection point, and determine the geospatial information as the fault point.

[0065] After the adjustment ends, the positioning device receives the geospatial information from the spatial positioning module carried by the coupled traveling wave generating device. The geospatial information may include, but is not limited to: longitude, latitude, altitude, etc. The geospatial information reflects the actual geographical location of the injection point of the coupled traveling wave generating device after adjustment. Determine the geospatial information as the fault point of the transmission line.

[0066] As Figure 2 shown in the example, the positioning device determines the fault point of the transmission line.

[0067] From Figure 1As can be seen from the method shown, the fault location method for transmission lines based on signal injection provided by the present invention determines the fault characteristics of the faulty line, the first signal amplitude at the first end of the faulty line, and the second signal amplitude at the second end of the faulty line based on the fault signals fed back by the non-contact distributed traveling wave location device; determines the injection point and the traveling wave signal characteristics of the coupled traveling wave generating device according to the fault characteristics, and controls the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the traveling wave signal characteristics; determines the third signal amplitude at the first end of the faulty line and the fourth signal amplitude at the second end of the faulty line based on the test signals fed back by the non-contact distributed traveling wave location device; adjusts the injection point so that the test ratio of the third signal amplitude to the fourth signal amplitude is equal to the fault ratio of the first signal amplitude to the second signal amplitude; obtains the geospatial information of the coupled traveling wave generating device after adjusting the injection point, and determines the geospatial information as the fault point.

[0068] By injecting a specific test traveling wave signal during a transmission line fault, the present invention can locate the fault point by adjusting the injection point, achieving precise positioning of the actual geographical location of the transmission line fault point. The method proposed by the present invention solves the problem that when the transmission line is long and there are situations such as unclear line topology and unclear pole numbers, only the abstract electrical distance of the fault point can be located, and the actual geographical location cannot be accurately located. Maintenance personnel can directly use the actual geographical location of the fault point to find the fault point, which speeds up the fault finding speed, avoids blind patrol, can simply, quickly and accurately determine the single-phase grounding fault point, and reduces the labor intensity of distribution line maintenance personnel.

[0069] In some optional embodiments, the above step S110 determines the fault characteristics, the first signal amplitude at the first end of the faulty line, and the second signal amplitude at the second end of the faulty line based on the fault signals fed back by the non-contact distributed traveling wave location device, including: obtaining the traveling wave waveforms fed back by multiple non-contact traveling wave sensors; determining the fault interval, the main frequency, and the fault phase according to the traveling wave waveforms; determining the first end and the second end of the faulty line according to the fault interval; determining the first signal amplitude according to the first traveling wave waveform of the non-contact traveling wave sensor corresponding to the first end of the faulty line, and determining the second signal amplitude according to the second traveling wave waveform of the non-contact traveling wave sensor corresponding to the second end of the faulty line.

[0070] Refer to Figure 2 the following illustrative implementation scenario schematic diagram to illustrate the above steps.

[0071] Five non-contact traveling wave sensors are distributedly installed on the transmission line, namely non-contact traveling wave sensor one to non-contact traveling wave sensor five.

[0072] The positioning device acquires the traveling wave waveforms fed back by each non-contact traveling wave sensor respectively. Non-contact sensor one feeds back traveling wave waveform one, non-contact sensor two feeds back traveling wave waveform two... non-contact sensor five feeds back traveling wave waveform five.

[0073] Based on the analysis of traveling wave waveforms one to five, the positioning device determines that the fault section is between non-contact traveling wave sensor three and non-contact traveling wave sensor four, determines the main frequency as Fr, and determines that the fault phase is phase A.

[0074] Based on the fault section, the positioning device determines that the first end (M end) of the faulty line corresponds to non-contact traveling wave sensor three, and the second end (N end) of the faulty line corresponds to non-contact traveling wave sensor four.

[0075] The positioning device determines the first signal amplitude A1 based on the traveling wave waveform three fed back by non-contact traveling wave sensor three, and determines the second signal amplitude A2 based on the traveling wave waveform four fed back by non-contact traveling wave sensor four.

[0076] In some alternative embodiments, step S120 determines the injection point and the traveling wave signal characteristics of the coupled traveling wave generating device according to the fault characteristics, and controls the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the traveling wave signal characteristics, including: randomly determining a point within the fault section as the injection point; using the main frequency as the injection frequency; using any phase different from the fault phase as the injection phase; controlling the coupled traveling wave generating device to inject the test traveling wave signal at the injection point with the injection frequency and the injection phase.

[0077] Refer to Figure 2 The above steps are described with reference to the schematic diagram of the illustrated implementation scenario.

[0078] After the positioning device determines the fault section, it can randomly determine a point within the fault section as the injection point. That is, randomly determine a point between non-contact traveling wave sensor three and non-contact traveling wave sensor four as the injection point. The positioning device can also use the midpoint of the fault section as the initially determined injection point.

[0079] The positioning device determines the main frequency Fr as the injection frequency of the coupled traveling wave generating device.

[0080] The positioning device determines phase B or phase C as the injection phase of the coupled traveling wave generating device.

[0081] The positioning device controls the coupled traveling wave generating device to generate a test traveling wave signal according to the injection frequency and the injection phase and inject it into the faulty line at the injection point.

[0082] In some alternative embodiments, step S130 determines the third signal amplitude at the first end of the faulty line and the fourth signal amplitude at the second end of the faulty line based on the test signals fed back by the non-contact distributed traveling wave positioning device, including: obtaining the third traveling wave waveform fed back by the non-contact traveling wave sensor corresponding to the first end of the faulty line, and determining the third signal amplitude according to the third traveling wave waveform; obtaining the fourth traveling wave waveform fed back by the non-contact traveling wave sensor corresponding to the second end of the faulty line, and determining the fourth signal amplitude according to the fourth traveling wave waveform.

[0083] Refer to Figure 2 the following schematic diagram of the illustrated implementation scenario to illustrate the above steps.

[0084] After the coupled traveling wave generating device injects a test traveling wave signal into the faulty line, the non-contact distributed traveling wave positioning device continues to send test signals to the positioning device.

[0085] The positioning device focuses on receiving the third traveling wave waveform sent by the non-contact traveling wave sensor three, and determines the third signal amplitude A3 according to the third traveling wave waveform.

[0086] The positioning device focuses on receiving the fourth traveling wave waveform sent by the non-contact traveling wave sensor four, and determines the fourth signal amplitude A4 according to the fourth traveling wave waveform.

[0087] In some alternative embodiments, step S140 adjusts the injection point so that the test ratio of the third signal amplitude to the fourth signal amplitude is equal to the fault ratio of the first signal amplitude to the second signal amplitude, including: when the first signal amplitude is greater than the second signal amplitude and the third signal amplitude is not greater than the fourth signal amplitude, adjusting the injection point towards the second end of the faulty line until the third signal amplitude is greater than the fourth signal amplitude.

[0088] Refer to Figure 2 the following schematic diagram of the illustrated implementation scenario to illustrate the above steps.

[0089] The positioning device compares the first signal amplitude A1 with the second signal amplitude A2, and compares the third signal amplitude A3 with the fourth signal amplitude A4.

[0090] If A1 > A2 and A3 ≤ A4, then adjust the injection point towards the second end (N end) of the faulty line. The adjustment distance can be half of the length from the injection point to the second end (N end) of the faulty line (or the adjustment distance can be a preset fixed length).

[0091] The positioning device continues to receive the third traveling wave waveform sent by the non-contact traveling wave sensor three and determines the third signal amplitude A3, continues to receive the fourth traveling wave waveform sent by the non-contact traveling wave sensor four and determines the fourth signal amplitude A4, and compares the third signal amplitude A3 with the fourth signal amplitude A4.

[0092] If A3 ≤ A4, continue to adjust the injection point towards the second end (N - end) of the faulty line. The adjustment distance can be half of the length from the previously adjusted injection point to the second end (N - end) of the faulty line (or the adjustment distance can be a preset fixed length). That is to say, the positioning device can control the coupled traveling - wave generating device to adjust the injection point towards the second end (N - end) of the faulty line in the form of dichotomy (or in the form of gradual advancement) until A3 > A4.

[0093] That is, if A3 > A4, end the adjustment of this step.

[0094] In addition, if A1 < A2 and A3 ≥ A4, adjust the injection point towards the second end (M - end) of the faulty line. The adjustment distance can be half of the length from the injection point to the first end (M - end) of the faulty line (or the adjustment distance can be a preset fixed length).

[0095] The positioning device continues to receive the third traveling - wave waveform sent by the non - contact traveling - wave sensor three and determines the third signal amplitude A3, continues to receive the fourth traveling - wave waveform sent by the non - contact traveling - wave sensor four and determines the fourth signal amplitude A4, and compares the third signal amplitude A3 with the fourth signal amplitude A4.

[0096] If A3 ≥ A4, continue to adjust the injection point towards the first end (M - end) of the faulty line. The adjustment distance can be half of the length from the previously adjusted injection point to the first end (M - end) of the faulty line (or the adjustment distance can be a preset fixed length). That is to say, the positioning device can control the coupled traveling - wave generating device to adjust the injection point towards the first end (M - end) of the faulty line in the form of dichotomy (or in the form of gradual advancement) until A3 < A4.

[0097] That is, if A3 < A4, end the adjustment of this step.

[0098] In some alternative embodiments, step S140 of adjusting the injection point to make the test ratio of the third signal amplitude to the fourth signal amplitude equal to the fault ratio of the first signal amplitude to the second signal amplitude includes: when the first signal amplitude is greater than the second signal amplitude and the third signal amplitude is greater than the fourth signal amplitude, determine the test ratio and the fault ratio; if the fault ratio is greater than the test ratio, adjust the injection point towards the second end of the faulty line; if the fault ratio is less than the test ratio, adjust the injection point towards the first end of the faulty line.

[0099] Refer to Figure 2 the following example of the implementation scenario schematic diagram to illustrate the above steps.

[0100] The positioning device compares the first signal amplitude A1 with the second signal amplitude A2, and compares the third signal amplitude A3 with the fourth signal amplitude A4.

[0101] If A1 > A2 and A3 > A4, the test ratio and the fault ratio are determined respectively. Among them, the test ratio s = A3 / A4, and the fault ratio k = A1 / A2.

[0102] The positioning device compares the test ratio s with the fault ratio k.

[0103] If k > s, continue to adjust the injection point towards the second end (N end) of the faulty line. The adjustment distance can be a preset adjustment length.

[0104] If k < s, continue to adjust the injection point towards the first end (M end) of the faulty line. The adjustment distance can be a preset adjustment length.

[0105] If k = s, end all adjustments.

[0106] In addition, if A1 < A2 and A3 < A4, the test ratio and the fault ratio are determined respectively. Among them, the test ratio s = A3 / A4, and the fault ratio k = A1 / A2.

[0107] The positioning device compares the test ratio s with the fault ratio k.

[0108] If k > s, continue to adjust the injection point towards the first end (M end) of the faulty line. The adjustment distance can be a preset adjustment length.

[0109] If k < s, continue to adjust the injection point towards the second end (N end) of the faulty line. The adjustment distance can be a preset adjustment length.

[0110] If k = s, end all adjustments.

[0111] After the positioning device determines that k = s, it obtains the geospatial information fed back by the spatial positioning module of the coupling traveling wave generating device when all adjustments are ended, and determines the geospatial information as the fault point. Thus, the positioning device determines the actual geographical location of the fault point on the transmission line.

[0112] In one embodiment, another method for locating the fault point on a transmission line based on signal injection is provided. Please refer to Figure 3 as shown in Figure 3 Another process schematic diagram of the method for locating the fault point on a transmission line based on signal injection provided by the embodiment of the present invention, includes the following steps:

[0113] Step S301, obtain the traveling wave waveforms fed back by multiple non-contact traveling wave sensors. Proceed to step S302.

[0114] Step S302, determine the fault interval, the main frequency, and the fault phase according to the traveling wave waveforms. Proceed to step S303.

[0115] Step S303: Determine the first end and the second end of the faulty line according to the faulty section. Determine the first signal amplitude according to the first traveling wave waveform of the non-contact traveling wave sensor corresponding to the first end of the faulty line, and determine the second signal amplitude according to the second traveling wave waveform of the non-contact traveling wave sensor corresponding to the second end of the faulty line. Proceed to step S304.

[0116] Step S304: Randomly determine a point within the faulty section as the injection point, use the main frequency as the injection frequency, and use any phase different from the faulty phase as the injection phase. Control the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the injection frequency and the injection phase. Proceed to step S305.

[0117] Step S305: Obtain the third traveling wave waveform feedback by the non-contact traveling wave sensor corresponding to the first end of the faulty line, determine the third signal amplitude according to the third traveling wave waveform, obtain the fourth traveling wave waveform feedback by the non-contact traveling wave sensor corresponding to the second end of the faulty line, and determine the fourth signal amplitude according to the fourth traveling wave waveform. Proceed to step S306.

[0118] Step S306: Judge the magnitude relationship between the first signal amplitude and the second signal amplitude, and judge the magnitude relationship between the third signal amplitude and the fourth signal amplitude. When the first signal amplitude is greater than the second signal amplitude and the third signal amplitude is not greater than the fourth signal amplitude, proceed to step S307; when the first signal amplitude is greater than the second signal amplitude and the third signal amplitude is greater than the fourth signal amplitude, proceed to step S308.

[0119] Step S307: Adjust the injection point towards the second end of the faulty line. Proceed to step S305.

[0120] Step S308: Determine the fault ratio of the first signal amplitude to the second signal amplitude and the test ratio of the third signal amplitude to the fourth signal amplitude. Proceed to step S309.

[0121] Step S309: Judge the magnitude relationship between the fault ratio and the test ratio. If the fault ratio is greater than the test ratio, proceed to step S310; if the fault ratio is less than the test ratio, proceed to step S311; if the fault ratio is equal to the test ratio, proceed to step S312.

[0122] Step S310: Adjust the injection point towards the second end of the faulty line. Proceed to step S305.

[0123] Step S311: Adjust the injection point towards the first end of the faulty line. Proceed to step S305.

[0124] Step S312: Obtain the geospatial information of the coupled traveling wave generating device after adjusting the injection point, and determine the geospatial information as the fault point.

[0125] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not imply the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0126] In one embodiment, a transmission line fault point location device based on signal injection is provided. The transmission line fault point location device based on signal injection corresponds one-to-one with the transmission line fault point location method based on signal injection in the above embodiment. As Figure 4 shown, the transmission line fault point location device 4 based on signal injection includes:

[0127] An acquisition unit 401, configured to determine the fault characteristics of the fault line, the first signal amplitude at the first end of the fault line, and the second signal amplitude at the second end of the fault line based on the fault signal fed back by the non-contact distributed traveling wave location device;

[0128] A control unit 402, configured to determine the injection point and the traveling wave signal characteristics of the coupled traveling wave generating device according to the fault characteristics, and control the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the traveling wave signal characteristics;

[0129] The acquisition unit 401 is further configured to determine the third signal amplitude at the first end of the fault line and the fourth signal amplitude at the second end of the fault line based on the test signal fed back by the non-contact distributed traveling wave location device;

[0130] The control unit 402 is further configured to adjust the injection point so that the test ratio of the third signal amplitude to the fourth signal amplitude is equal to the fault ratio of the first signal amplitude to the second signal amplitude;

[0131] A location unit 403, configured to obtain the geospatial information of the coupled traveling wave generating device after adjusting the injection point, and determine the geospatial information as the fault point of the transmission line.

[0132] In some alternative embodiments, the acquisition unit 401 includes: an information acquisition module, configured to acquire the traveling wave waveforms fed back by a plurality of non-contact traveling wave sensors; a fault characteristic determination module, configured to determine the fault interval, the main frequency, and the fault phase according to the traveling wave waveforms; an end point determination module, configured to determine the first end and the second end of the fault line according to the fault interval; and an amplitude determination module, configured to determine the first signal amplitude according to the first traveling wave waveform of the non-contact traveling wave sensor corresponding to the first end of the fault line, and determine the second signal amplitude according to the second traveling wave waveform of the non-contact traveling wave sensor corresponding to the second end of the fault line.

[0133] In some alternative embodiments, the control unit 402 includes: an injection point determination module, configured to randomly determine a point within the fault section as the injection point; a frequency determination module, configured to use the main frequency as the injection frequency; a phase determination module, configured to use any phase different from the fault phase as the injection phase; and an instruction module, configured to control the coupled wave generating device to inject a test traveling wave signal at the injection point with the injection frequency and the injection phase.

[0134] In some alternative embodiments, the information acquisition module is further configured to acquire a third traveling wave waveform feedback by a non-contact traveling wave sensor corresponding to the first end of the fault line, and acquire a fourth traveling wave waveform feedback by a non-contact traveling wave sensor corresponding to the second end of the fault line; the amplitude determination module is further configured to: determine a third signal amplitude according to the third traveling wave waveform, and determine a fourth signal amplitude according to the fourth traveling wave waveform.

[0135] In some alternative embodiments, the control unit 402 includes: an adjustment module, configured to adjust the injection point towards the second end of the fault line until the third signal amplitude is greater than the fourth signal amplitude when the first signal amplitude is greater than the second signal amplitude and the third signal amplitude is not greater than the fourth signal amplitude.

[0136] In some alternative embodiments, the adjustment module is further configured to determine a test ratio and a fault ratio when the first signal amplitude is greater than the second signal amplitude and the third signal amplitude is greater than the fourth signal amplitude; if the fault ratio is greater than the test ratio, adjust the injection point towards the second end of the fault line; if the fault ratio is less than the test ratio, adjust the injection point towards the first end of the fault line.

[0137] For the specific limitations of the transmission line fault point location device based on signal injection, reference may be made to the limitations of the transmission line fault point location method based on signal injection in the foregoing text, which will not be elaborated herein. Each module in the above-mentioned transmission line fault point location device based on signal injection can be implemented in whole or in part by software, hardware, and their combination. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory of the computer device in the form of software, so as to facilitate the processor to call and execute the operations corresponding to the above-mentioned respective modules.

[0138] In one embodiment, a transmission line fault point location system based on signal injection is provided. The transmission line fault point location system based on signal injection corresponds one-to-one with the transmission line fault point location method based on signal injection in the above-mentioned embodiment. As Figure 5 shown, the transmission line fault point location system 5 based on signal injection includes: a non-contact distributed traveling wave location device 51, a transmission line fault point location device 4 based on signal injection, and a coupled traveling wave generating device 52.

[0139] The non-contact distributed traveling wave positioning device 51 is used to acquire fault signals and test signals, and send the fault signals and test signals to the transmission line fault point positioning device 4 based on signal injection;

[0140] The coupled traveling wave generating device 52 is used to inject test traveling wave signals under the control of the transmission line fault point positioning device 4 based on signal injection;

[0141] The coupled traveling wave generating device 52 is also used to send geospatial information to the transmission line fault point positioning device 4 based on signal injection;

[0142] The transmission line fault point positioning device 4 based on signal injection is used to implement the steps of the transmission line fault point positioning method based on signal injection.

[0143] In one embodiment, a computer device is provided, and its internal structure diagram can be as Figure 6 shown. The computer device includes a processor, a memory, a network interface, and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes non-volatile and / or volatile storage media, and internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external client through a network connection. When the computer program is executed by the processor, it realizes the functions or steps of a method for constructing a database of mountain distribution line faults.

[0144] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the following steps are realized:

[0145] Based on the fault signals fed back by the non-contact distributed traveling wave positioning device, determine the fault characteristics of the fault line, the first signal amplitude at the first end of the fault line, and the second signal amplitude at the second end of the fault line;

[0146] According to the fault characteristics, determine the injection point and the traveling wave signal characteristics of the coupled traveling wave generating device, and control the coupled traveling wave generating device to inject test traveling wave signals at the injection point with the traveling wave signal characteristics;

[0147] Based on the test signals fed back by the non-contact distributed traveling wave positioning device, determine the third signal amplitude at the first end of the fault line and the fourth signal amplitude at the second end of the fault line;

[0148] Adjust the injection point so that the test ratio of the third signal amplitude to the fourth signal amplitude is equal to the fault ratio of the first signal amplitude to the second signal amplitude;

[0149] Obtain the geospatial information fed back by the coupled traveling wave generating device after adjusting the injection point, and determine the fault point based on the geospatial information.

[0150] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0151] Based on the fault signal fed back by the non-contact distributed traveling wave positioning device, determine the fault characteristics of the fault line, the first signal amplitude at the first end of the fault line, and the second signal amplitude at the second end of the fault line;

[0152] According to the fault characteristics, determine the injection point and the traveling wave signal characteristics of the coupled traveling wave generating device, and control the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the traveling wave signal characteristics;

[0153] Based on the test signal fed back by the non-contact distributed traveling wave positioning device, determine the third signal amplitude at the first end of the fault line and the fourth signal amplitude at the second end of the fault line;

[0154] Adjust the injection point so that the test ratio of the third signal amplitude to the fourth signal amplitude is equal to the fault ratio of the first signal amplitude to the second signal amplitude;

[0155] Obtain the geospatial information fed back by the coupled traveling wave generating device after adjusting the injection point, and determine the fault point based on the geospatial information.

[0156] It should be noted that the functions or steps that the above computer-readable storage medium or computer device can achieve can be correspondingly referred to the relevant descriptions in the foregoing method embodiments. To avoid repetition, they will not be described one by one here.

[0157] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided by the present invention can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0158] Those skilled in the art can clearly understand that for the convenience and brevity of description, only the above division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0159] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention and should all be included in the protection scope of the present invention.

Claims

1. A fault point location method for transmission lines based on signal injection, characterized in that, The method includes: Based on the fault signal fed back by the non-contact distributed traveling wave positioning device, determining the fault characteristics of the fault line, the first signal amplitude at the first end of the fault line, and the second signal amplitude at the second end of the fault line; According to the fault characteristics, determining the injection point and the traveling wave signal characteristics of the coupled traveling wave generating device, and controlling the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the traveling wave signal characteristics; Based on the test signal fed back by the non-contact distributed traveling wave positioning device, determining the third signal amplitude at the first end of the fault line and the fourth signal amplitude at the second end of the fault line; Adjusting the injection point so that the test ratio of the third signal amplitude to the fourth signal amplitude is equal to the fault ratio of the first signal amplitude to the second signal amplitude; Obtaining the geospatial information fed back by the coupled traveling wave generating device after adjusting the injection point, and determining the geospatial information as the fault point.

2. The method for locating a fault point on a transmission line based on signal injection according to claim 1, wherein The determining the fault characteristics of the fault line, the first signal amplitude at the first end of the fault line, and the second signal amplitude at the second end of the fault line based on the fault signal fed back by the non-contact distributed traveling wave positioning device includes: Obtaining the traveling wave waveforms fed back by multiple non-contact traveling wave sensors; Determining the fault interval, the main frequency, and the fault phase according to the traveling wave waveforms; Determining the first end and the second end of the fault line according to the fault interval; Determining the first signal amplitude according to the first traveling wave waveform of the non-contact traveling wave sensor corresponding to the first end of the fault line, and determining the second signal amplitude according to the second traveling wave waveform of the non-contact traveling wave sensor corresponding to the second end of the fault line.

3. The method for locating the fault point of a transmission line based on signal injection according to claim 2, wherein The determining the injection point and the traveling wave signal characteristics of the coupled traveling wave generating device according to the fault characteristics, and controlling the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the traveling wave signal characteristics includes: Randomly determining a point within the fault interval as the injection point; Using the main frequency as the injection frequency; Using any phase different from the fault phase as the injection phase; Controlling the coupled wave generating device to inject the test traveling wave signal at the injection point with the injection frequency and the injection phase.

4. The method for locating a fault point on a transmission line based on signal injection according to claim 2, wherein, The determining the third signal amplitude at the first end of the fault line and the fourth signal amplitude at the second end of the fault line based on the test signal fed back by the non-contact distributed traveling wave positioning device includes: Obtaining the third traveling wave waveform fed back by the non-contact traveling wave sensor corresponding to the first end of the fault line, and determining the third signal amplitude according to the third traveling wave waveform; Obtaining the fourth traveling wave waveform fed back by the non-contact traveling wave sensor corresponding to the second end of the fault line, and determining the fourth signal amplitude according to the fourth traveling wave waveform.

5. The method for locating a fault point on a transmission line based on signal injection according to claim 1, wherein The adjusting the injection point so that the test ratio of the third signal amplitude to the fourth signal amplitude is equal to the fault ratio of the first signal amplitude to the second signal amplitude includes: When the amplitude of the first signal is greater than the amplitude of the second signal and the amplitude of the third signal is not greater than the amplitude of the fourth signal, adjust the injection point towards the second end of the faulty line until the amplitude of the third signal is greater than the amplitude of the fourth signal.

6. The method for locating a fault point of a transmission line based on signal injection according to claim 1 or 5, characterized in that, Adjusting the injection point to make the test ratio of the amplitude of the third signal to the amplitude of the fourth signal equal to the fault ratio of the amplitude of the first signal to the amplitude of the second signal includes: When the amplitude of the first signal is greater than the amplitude of the second signal and the amplitude of the third signal is greater than the amplitude of the fourth signal, determine the test ratio and the fault ratio; If the fault ratio is greater than the test ratio, adjust the injection point towards the second end of the faulty line; If the fault ratio is less than the test ratio, adjust the injection point towards the first end of the faulty line.

7. A transmission line fault point location device based on signal injection, characterized in that, The device includes: An acquisition unit, configured to determine the fault characteristics of the faulty line, the amplitude of the first signal at the first end of the faulty line, and the amplitude of the second signal at the second end of the faulty line based on the fault signals fed back by the non-contact distributed traveling wave positioning device; A control unit, configured to determine the injection point and the traveling wave signal characteristics of the coupled traveling wave generating device according to the fault characteristics, and control the coupled traveling wave generating device to inject a test traveling wave signal at the injection point with the traveling wave signal characteristics; The acquisition unit is further configured to determine the amplitude of the third signal at the first end of the faulty line and the amplitude of the fourth signal at the second end of the faulty line based on the test signals fed back by the non-contact distributed traveling wave positioning device; The control unit is further configured to adjust the injection point to make the test ratio of the amplitude of the third signal to the amplitude of the fourth signal equal to the fault ratio of the amplitude of the first signal to the amplitude of the second signal; A positioning unit, configured to obtain the geospatial information fed back by the coupled traveling wave generating device after adjusting the injection point, and determine the geospatial information as the fault point.

8. A transmission line fault point location system based on signal injection, characterized in that, The system includes: a non-contact distributed traveling wave positioning device, a transmission line fault point positioning device based on signal injection, and a coupled traveling wave generating device; The non-contact distributed traveling wave positioning device is configured to obtain fault signals and test signals, and send the fault signals and the test signals to the transmission line fault point positioning device based on signal injection; The coupled traveling wave generating device is configured to inject a test traveling wave signal under the control of the transmission line fault point positioning device based on signal injection; The coupled traveling wave generating device is further configured to send geospatial information to the transmission line fault point positioning device based on signal injection; The transmission line fault point positioning device based on signal injection is configured to implement the steps of the transmission line fault point positioning method based on signal injection according to any one of claims 1 to 6.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the transmission line fault point positioning method based on signal injection according to any one of claims 1 to 6.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the transmission line fault point positioning method based on signal injection according to any one of claims 1 to 6.

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