A transient recording type distribution network overhead line monitoring method and system

Abstract

The present application provides a transient wave recording type distribution network overhead line monitoring method and system, the method comprising: obtaining a first characteristic value of a first area and a second characteristic value of a second area at the same time; obtaining a phase correspondence relationship between the first area and the second area through the first characteristic value and the second characteristic value; obtaining the current flow direction on the distribution network overhead line according to the first characteristic value, the second characteristic value and the phase correspondence relationship; obtaining a first transient signal of the first area and a second transient signal of the second area; judging whether there is a defect in the first area and / or the second area through the current flow direction, the first transient signal and the second transient signal, and outputting defect status information; changing the position of the first area or the second area according to the defect status information of the first area and the second area. The method can check the overhead line, judge the position of the defect according to the defect of the line, and has high flexibility and accuracy.

Description

Technical Field

[0001] The present application relates to the field of distribution network monitoring, and in particular to a transient wave recording type distribution network overhead line monitoring method and system. Background Art

[0002] For distribution network lines, there are problems such as high failure rate, prominent repeated failure problems, and a large proportion of failures with unknown causes. Specifically, for distribution network overhead lines, most of the faults are high-resistance grounding faults, which are mainly manifested by lightning arrester performance degradation, insulator cracks, contamination, tree discharge, lightning flashover, gap arc grounding, etc.

[0003] In order to solve the faults in the overhead lines of the distribution network, it is necessary to check the lines and find out the specific location of the fault. The specific checking method is: detect the voltage value at a certain location of the overhead line of the distribution network, and judge whether there is a fault in the overhead line of the distribution network by whether there is an abnormality in the voltage value.

[0004] However, many faults do not cause obvious abnormal voltage values ​​on the overhead lines of the distribution network, and the location of the defect or fault cannot be found through the voltage value. The current live detection scheme cannot monitor for a long time and is only effective for permanent faults, because most line faults are recoverable, such as gap discharge, equipment flashover, and moisture discharge. Therefore, the existing live detection scheme is powerless against arc, overvoltage, overcurrent and other faults, and its scope of application is very limited. Summary of the invention

[0005] The present application provides a transient wave recording type distribution network overhead line monitoring method and system to solve the problem that traditional monitoring methods cannot accurately find the location where a fault occurs.

[0006] In a first aspect, the present application provides a transient wave recording type distribution network overhead line monitoring method, comprising:

[0007] At the same time, obtaining a first characteristic value of a first area and a second characteristic value of a second area, wherein the first area and the second area are two different areas selected on an overhead line of a distribution network;

[0008] Obtaining a corresponding relationship between the first region and the second region according to the first eigenvalue and the second eigenvalue;

[0009] Obtaining a current flow direction on an overhead line of a distribution network according to the first eigenvalue, the second eigenvalue and the respective corresponding relationship;

[0010] Acquire a first transient signal of the first area and a second transient signal of the second area;

[0011] determining whether there is a defect in the first area and / or the second area according to the current flow direction, the first transient signal, and the second transient signal, and outputting defect status information;

[0012] According to the defect status information of the first area and the second area, the position of the first area or the second area is changed, and the defect status is continuously determined to clarify the position causing the defect.

[0013] Optionally, at the same time, in the step of obtaining the first eigenvalue of the first area and the second eigenvalue of the second area, the first eigenvalue includes three different voltage phase information and three different current amplitudes in the first area, and the second eigenvalue includes three different voltage phase information and three different current amplitudes in the second area.

[0014] Optionally, the step of obtaining the respective corresponding relationship between the first region and the second region through the first eigenvalue and the second eigenvalue includes:

[0015] Obtain standard voltage phase information of overhead lines in distribution network during normal operation;

[0016] The voltage phase information of three phases in the first area and the voltage phase information of three phases in the second area are compared with the standard voltage phase information to obtain the corresponding relationship between the three phases in the first area and the three phases in the second area.

[0017] Optionally, the step of obtaining the current flow direction on the overhead line of the distribution network according to the first eigenvalue, the second eigenvalue and the respective corresponding relationship includes:

[0018] According to the phase-to-phase correspondence relationship, one phase is randomly selected as a current flow direction determination phase;

[0019] The current direction is obtained by comparing the current amplitude of the first region and the current amplitude of the second region on the current direction determination phase.

[0020] Optionally, judging whether the first region and / or the second region has a defect by using the current flow direction, the first transient signal, and the second transient signal, and outputting the defect status information comprises:

[0021] Obtain typical defect waveform characteristics;

[0022] Calculating the similarity between the first transient signal and the typical defect waveform feature, and the similarity between the second transient signal and the typical defect waveform feature;

[0023] Determining whether the first region and the second region have defects according to a preset similarity threshold;

[0024] Output defect status information.

[0025] Optionally, the step of obtaining whether the first region and the second region have defects according to a preset similarity threshold and outputting defect status information further includes:

[0026] If the similarity between the first transient signal and the typical defect waveform feature is greater than a preset similarity threshold, outputting state information indicating that the first area has a defect;

[0027] If the similarity between the second transient signal and the typical defect waveform feature is greater than a preset similarity threshold, status information indicating that a defect exists in the second area is output.

[0028] Optionally, the step of changing the position of the first area or the second area according to the defect status information of the first area and the second area, and continuing to determine whether there is a defect includes:

[0029] If both the first region and the second region have defects, obtaining the current flow direction;

[0030] If the current flows from the first region to the second region, reselecting a region behind the second region to replace the first region;

[0031] If the current flows from the second region to the first region, a new region is selected at the rear side of the first region to replace the second region.

[0032] Optionally, the step of changing the position of the first area or the second area according to the defect status information of the first area and the second area, and continuing to determine whether there is a defect further includes:

[0033] If there are no defects in the first region and the second region, obtaining the current flow direction;

[0034] If the current flows from the first region to the second region, reselecting a region on the front side of the first region to replace the second region;

[0035] If the current flows from the second region to the first region, a new region is selected on the front side of the second region to replace the first region.

[0036] Optionally, the step of changing the position of the first area or the second area according to the defect status information of the first area and the second area, and continuing to determine whether there is a defect further includes:

[0037] If there is a defect in the first area and there is no defect in the second area, determining whether the defect position is clear;

[0038] If the defect location is clear, output the defect location information;

[0039] If the defect position is unclear, a new region is selected at the midpoint of the first region and the second region to replace the second region.

[0040] In a second aspect, the present application provides a transient wave recording type distribution network overhead line monitoring system, comprising:

[0041] A monitoring unit, wherein the monitoring unit is configured to: obtain a first characteristic value of a first area and a second characteristic value of a second area at the same time, wherein the first area and the second area are two different areas selected on an overhead line of a power distribution network;

[0042] A phase core unit, wherein the phase core unit is configured to: obtain a phase correspondence relationship between the first region and the second region through the first eigenvalue and the second eigenvalue;

[0043] A defect judgment unit, wherein the defect judgment unit is configured to: obtain a current flow direction on an overhead line of a distribution network according to the first characteristic value, the second characteristic value and the respective corresponding relationship;

[0044] The monitoring unit is further configured to: obtain a first transient signal of the first area and a second transient signal of the second area;

[0045] The defect judgment unit is further configured to: judge whether there is a defect in the first area and / or the second area according to the current flow direction, the first transient signal and the second transient signal, and output defect status information;

[0046] According to the defect status information of the first area and the second area, the position of the first area or the second area is changed, and the defect status is continuously determined to clarify the position causing the defect.

[0047] It can be seen from the above technical solutions that the present application provides a transient wave recording type distribution network overhead line monitoring method and system. The method includes: at the same time, obtaining the first characteristic value of the first area and the second characteristic value of the second area; obtaining the phase correspondence between the first area and the second area through the first characteristic value and the second characteristic value; obtaining the current flow direction on the distribution network overhead line according to the first characteristic value, the second characteristic value and the phase correspondence; obtaining the first transient signal of the first area and the second transient signal of the second area; judging whether there are defects in the first area and / or the second area through the current flow direction, the first transient signal and the second transient signal, and outputting defect status information; changing the position of the first area or the second area according to the defect status information of the first area and the second area. The method can check along the overhead line, judge the location of the defect by the defect of the line, and has high flexibility and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0049] Figure 1 A flow chart of a transient wave recording type distribution network overhead line monitoring method provided in an embodiment of the present application;

[0050] Figure 2 A schematic diagram of a first area and a second area provided in an embodiment of the present application;

[0051] Figure 3 A schematic diagram of overhead lines of a distribution network provided in an embodiment of the present application;

[0052] Figure 4 Another schematic diagram of a power distribution network overhead line provided in an embodiment of the present application;

[0053] Figure 5 Another schematic diagram of overhead lines of a distribution network provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0055] The distribution network refers to a power grid that receives electric energy from the transmission network or regional power plants and distributes it locally or step by step according to voltage to various users through distribution facilities. It is composed of overhead lines, cables, poles and towers, distribution transformers, disconnectors, reactive power compensators and some ancillary facilities, and plays an important role in distributing electric energy in the power grid. Overhead lines mainly refer to overhead open lines, which are erected above the ground. They are transmission lines that use insulators to fix transmission wires on poles and towers erected on the ground to transmit electric energy.

[0056] See also Figure 1 , is a flow chart of a transient wave recording type distribution network overhead line monitoring method provided in an embodiment of the present application. Figure 2 , is a schematic diagram of a first area and a second area provided in an embodiment of the present application. Figure 1 and Figure 2 It can be seen that the present application provides a transient recording type distribution network overhead line monitoring method, comprising the following steps:

[0057] S1: At the same time, a first characteristic value of a first area and a second characteristic value of a second area are obtained, where the first area and the second area are two different areas selected on an overhead line of a distribution network.

[0058] In the technical solution of the present application, in order to monitor defects along the overhead line of the distribution network, two areas can be selected on the overhead line of the distribution network as monitoring areas. The purpose of defect monitoring is achieved by measuring and calculating the selected areas. The first characteristic value may include three phase voltage information and three phase current amplitude information in the first area, and the first characteristic value is formed by aggregation. The second characteristic value may include three phase voltage information and three phase current amplitude in the second area. The acquisition process can be completed by an acquisition module, and the acquisition module may include a voltage sensor and a current sensor, etc. Specifically, the voltage sensor may be an electric field, a magnetic field or an electromagnetic coupling sensor, and the current sensor may be a magnetic field, an electromagnetic coupling or a photoelectric sensor. The collection process can be completed by a collection module, and data can be transmitted between the collection module and the collection module through a wireless connection. In practical applications, by comparing the voltage phase information, the three phases of the first area and the second area can be distinguished, and then the one-to-one correspondence between the first area and the second area is obtained, thereby avoiding the judgment of the phase before acquiring the data, and avoiding the pre-correspondence between the first area and the second area.

[0059] S2: Obtaining a corresponding relationship between the first region and the second region through the first eigenvalue and the second eigenvalue.

[0060] The specific steps include:

[0061] S21: Obtain standard voltage phase information of the overhead line of the distribution network during normal operation;

[0062] S22: Compare the voltage phase information of three phases in the first area and the voltage phase information of three phases in the second area with the standard voltage phase information to obtain a corresponding relationship between the three phases in the first area and the three phases in the second area.

[0063] In this embodiment, the standard voltage phase information may be the voltage phase information when the overhead line of the distribution network is in normal operation. The voltage phase information includes information such as the phase angle. By comparing the three phases of the voltage phase information of the first area and the three phases of the voltage phase information of the second area with the standard voltage phase information at the same time, the phase correspondence between the first area and the second area can be obtained. In this way, it is possible to avoid phase judgment of the overhead line before obtaining the first characteristic value and the second characteristic value, and there is no need to manually make a one-to-one correspondence between the first area and the second area, which is convenient and fast. For example, through the above steps, it can be clear that the A phase of the first area corresponds to the A phase of the second area, the B phase of the first area corresponds to the B phase of the second area, and the C phase of the first area corresponds to the C phase of the second area. At the same time, it can also be clear that the three collected voltage phase information respectively belong to which phase of the three phases A, B and C of the first area, and the three collected voltage phase information respectively belong to which phase of the three phases A, B and C of the second area.

[0064] S3: Obtain the current flow direction on the overhead line of the distribution network according to the first eigenvalue, the second eigenvalue and the respective corresponding relationship.

[0065] In this embodiment, the defect location can be checked along the line by the current flow direction. The specific steps of obtaining the current flow direction are as follows:

[0066] S31: arbitrarily selecting a phase according to the phase-to-phase correspondence relationship as a current flow direction determination phase;

[0067] S32: Obtain the current direction by comparing the current amplitude of the first region and the current amplitude of the second region on the current direction determination phase.

[0068] In the technical solution of the present application, on the overhead line of the distribution network, the current amplitude at the front side of the current flow is greater than the current amplitude at the rear side of the current flow, so the current flow direction can be determined by calculating the ratio between the current amplitude in the first area and the current amplitude in the second area. At present, with the large-scale access of distributed energy and the power supply operation of the distribution network, the load current flow direction is uncertain, and it is very difficult to manually identify the current flow direction. The technical solution provided in the embodiment of the present application does not require manual identification of the current flow direction.

[0069] It should be understood that in the embodiments of the present application, for the overhead line of the power distribution network, the area where the current flows first is called the front side, and the area where the current flows later is called the rear side. The front side and the rear side are only for the convenience of description and have no other limiting effect.

[0070] In some implementations, after obtaining the phase correspondence and current flow direction, the line topology of the overhead line of the distribution network can also be generated to facilitate subsequent line troubleshooting.

[0071] S4: Acquire a first transient signal of the first area and a second transient signal of the second area;

[0072] The voltage, current, frequency and other signals on the overhead line of the distribution network are monitored. When a disturbance occurs, the disturbance can be automatically recorded to form a first transient signal and a second transient signal. The first transient signal and the second transient signal are signs for judging whether there are defects in the line. In practical applications, the three-phase lines in the first area can be automatically recorded separately and finally aggregated into a first transient signal. The three-phase lines in the second area can be automatically recorded separately and finally aggregated into a second transient signal. The automatic recording process can be completed by the acquisition unit, and the aggregation process can be completed by the aggregation unit.

[0073] S5: judging whether there is a defect in the first area and / or the second area according to the current flow direction, the first transient signal and the second transient signal, and outputting defect status information.

[0074] In some implementations, the first transient signal and the second transient signal may be transmitted to a cloud processor via wireless communication, and the cloud processor may perform defect determination.

[0075] The specific steps are as follows:

[0076] S51: Obtain typical defect waveform characteristics;

[0077] S52: Calculating the similarity between the first transient signal and the typical defect waveform feature, and the similarity between the second transient signal and the typical defect waveform feature;

[0078] S53: Determine whether the first region and the second region have defects according to a preset similarity threshold;

[0079] S54: Output defect status information.

[0080] Specific:

[0081] S55: if the similarity between the first transient signal and the typical defect waveform feature is greater than a preset similarity threshold, outputting information that a defect exists in the first area;

[0082] S56: If the similarity between the second transient signal and the typical defect waveform feature is greater than a preset similarity threshold, output information indicating that a defect exists in the second area.

[0083] In the embodiment of the present application, by calculating the similarity between the first transient signal and the typical defect waveform characteristics, it can be determined whether the first transient signal conforms to the typical defect waveform characteristics. If so, there may be defects in the first area and the vicinity of the first area, and defect information of the defects in the first area can be output for further troubleshooting and repair to eliminate the defects. By calculating the similarity between the second transient signal and the typical defect waveform characteristics, it can be determined whether the second transient signal conforms to the typical defect waveform characteristics. If so, there may be defects in the second area and the vicinity of the second area, and defect information of the defects in the second area can be output for further troubleshooting and repair to eliminate the defects. In practical applications, the similarity threshold can be 80%, which can be designed according to actual conditions.

[0084] S6: According to the defect status information of the first area and the second area, the position of the first area or the second area is changed, and the defect status is continued to be determined to clarify the position causing the defect.

[0085] The specific steps include:

[0086] S61: if both the first region and the second region have defects, obtaining the current flow direction;

[0087] S62: if the current flows from the first region to the second region, reselecting a region behind the second region to replace the first region;

[0088] S63: If the current flows from the second region to the first region, reselect a region behind the first region to replace the second region.

[0089] See also Figure 3 , is a schematic diagram of overhead lines of a distribution network provided in an embodiment of the present application. Figure 3 (a) shows the current flowing from the first region to the second region. Figure 3(b) shows the situation where the current flows from the second area to the first area. In this embodiment, if there are defects in both the first area and the second area, it means that there are defective line sections between the first area and the second area. If the current flows from the first area to the second area, it means that the defective line section extends behind the second area, and a new area is selected at the back of the second area to replace the first area. If the current flows from the second area to the first area, it means that the defective line section extends behind the first area, and a new area is selected at the back of the first area to replace the second area. In this way, the reselected area can be monitored to find the specific location that causes the defect.

[0090] S64: if there are no defects in the first region and the second region, obtaining the current flow direction;

[0091] S65: if the current flows from the first region to the second region, reselecting a region on the front side of the first region to replace the second region;

[0092] S66: If the current flows from the second region to the first region, reselect a region on the front side of the second region to replace the first region.

[0093] See also Figure 4 , which is another schematic diagram of the overhead lines of the distribution network provided in an embodiment of the present application. Figure 4 (a) shows the current flowing from the first region to the second region. Figure 4 (b) shows the situation where the current flows from the second area to the first area. In this embodiment, if there are no defects in both the first area and the second area, it means that there is no defective line section between the first area and the second area. If the current flows from the first area to the second area, the area can be reselected on the front side of the first area to replace the second area, and the defects can be checked upstream of the first area. If the current flows from the second area to the first area, the area can be reselected on the front side of the second area to replace the first area, and the defects can be checked upstream of the second area. In this way, the reselected area can be monitored to find the specific location that causes the defect.

[0094] S67: If there is a defect in the first area and there is no defect in the second area, determine whether the defect position is clear;

[0095] S68: If the defect location is clear, output the defect location information;

[0096] S69: If the defect position is unclear, reselect an area at the midpoint of the first area and the second area to replace the second area.

[0097] See also Figure 5 , which is another schematic diagram of the overhead line of the power distribution network provided in the embodiment of the present application. In this embodiment, if there is a defect in the first area and there is no defect in the second area, it can be further determined whether the location causing the defect is clear. If it is clear, it proves that the specific location causing the defect has been found, and the defect location information is output. If the location causing the defect is not clear, a new area can be selected at the midpoint of the first area and the second area to replace the second area.

[0098] After changing the area, the steps S1 to S6 can be performed again. Through the above troubleshooting process, the location causing the defect can be found accurately and quickly, which can speed up the repair process.

[0099] The present application also provides a transient wave recording type distribution network overhead line monitoring system, including:

[0100] A monitoring unit, wherein the monitoring unit is configured to: obtain a first characteristic value of a first area and a second characteristic value of a second area at the same time, wherein the first area and the second area are two different areas selected on an overhead line of a power distribution network;

[0101] A phase core unit, wherein the phase core unit is configured to: obtain a phase correspondence relationship between the first region and the second region through the first eigenvalue and the second eigenvalue;

[0102] A defect judgment unit, wherein the defect judgment unit is configured to: obtain a current flow direction on an overhead line of a distribution network according to the first characteristic value, the second characteristic value and the respective corresponding relationship;

[0103] The monitoring unit is further configured to: obtain a first transient signal of the first area and a second transient signal of the second area;

[0104] The defect judgment unit is further configured to: judge whether there is a defect in the first area and / or the second area according to the current flow direction, the first transient signal and the second transient signal, and output defect status information;

[0105] According to the defect status information of the first area and the second area, the position of the first area or the second area is changed, and the defect status is continuously determined to clarify the position causing the defect.

[0106] It can be seen from the above technical scheme that the present application provides a transient recording type distribution network overhead line monitoring method and system, the method comprising: at the same time, obtaining the first characteristic value of the first area and the second characteristic value of the second area, the first area and the second area are two different areas selected on the distribution network overhead line; through the first characteristic value and the second characteristic value, obtaining the phase correspondence between the first area and the second area; according to the first characteristic value, the second characteristic value and the phase correspondence, obtaining the current flow direction on the distribution network overhead line; obtaining the first transient signal of the first area and the second transient signal of the second area; through the current flow direction, the first transient signal and the second transient signal, judging whether there is a defect in the first area and / or the second area, and outputting defect status information; according to the defect status information of the first area and the second area, changing the position of the first area or the second area, and continuing to judge the defect status to clarify the location causing the defect. The monitoring method provided by the present application can check along the overhead line of the distribution network, and judge the location causing the defect by the defect condition of the line, with high flexibility and more accuracy.

[0107] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A transient wave recording type distribution network overhead line monitoring method, characterized in that: include: At the same time, obtaining a first characteristic value of a first area and a second characteristic value of a second area, wherein the first area and the second area are two different areas selected on an overhead line of a distribution network; Obtaining a corresponding relationship between the first region and the second region according to the first eigenvalue and the second eigenvalue; Obtaining a current flow direction on an overhead line of a distribution network according to the first eigenvalue, the second eigenvalue and the respective corresponding relationship; The step of obtaining the current flow direction on the overhead line of the distribution network according to the first characteristic value, the second characteristic value and the respective corresponding relationship comprises: According to the phase-to-phase correspondence relationship, one phase is randomly selected as a current flow direction determination phase; Obtain the current flow direction on the overhead line of the distribution network by comparing the current amplitude of the first region and the current amplitude of the second region on the current flow direction determination phase; Acquire a first transient signal of the first area and a second transient signal of the second area; Obtain typical defect waveform characteristics; Calculating the similarity between the first transient signal and the typical defect waveform feature, and calculating the similarity between the second transient signal and the typical defect waveform feature; Determining whether the first region and the second region have defects according to a preset similarity threshold; Output defect status information; According to the defect status information of the first area and the second area, changing the position of the first area or the second area, and continuing to determine the defect status to clarify the position causing the defect; The step of changing the position of the first area or the second area according to the defect status information of the first area and the second area and continuing to determine whether there is a defect includes: If both the first area and the second area have defects, obtaining the current flow direction on the overhead line of the distribution network; If the current on the overhead line of the distribution network flows from the first area to the second area, a new area is selected on the rear side of the second area to replace the first area; wherein, for the overhead line of the distribution network, the area through which the current flows first is called the front side, and the area through which the current flows later is called the rear side; If the current on the overhead line of the power distribution network flows from the second area to the first area, reselect an area behind the first area to replace the second area; If there are no defects in the first area and the second area, obtaining the current flow direction on the overhead line of the distribution network; If the current on the overhead line of the power distribution network flows from the first area to the second area, reselect an area in front of the first area to replace the second area; If the current on the overhead line of the power distribution network flows from the second area to the first area, reselect an area in front of the second area to replace the first area; If there is a defect in the first area and there is no defect in the second area, determining whether the defect position is clear; If the defect location is clear, output the defect location information; If the defect position is unclear, a new region is selected at the midpoint of the first region and the second region to replace the second region.

2. The transient wave recording type distribution network overhead line monitoring method according to claim 1 is characterized in that: At the same time, in the step of obtaining the first characteristic value of the first area and the second characteristic value of the second area, the first characteristic value includes three phases of voltage phase information and three phases of current amplitudes in the first area, and the second characteristic value includes three phases of voltage phase information and three phases of current amplitudes in the second area.

3. The transient wave recording type distribution network overhead line monitoring method according to claim 2 is characterized in that: The step of obtaining the respective corresponding relationship between the first region and the second region by using the first eigenvalue and the second eigenvalue comprises: Obtain standard voltage phase information of overhead lines in distribution network during normal operation; The voltage phase information of three phases in the first area and the voltage phase information of three phases in the second area are compared with the standard voltage phase information to obtain the corresponding relationship between the three phases in the first area and the three phases in the second area.

4. The transient wave recording type distribution network overhead line monitoring method according to claim 3 is characterized in that: The step of obtaining whether the first region and the second region have defects according to a preset similarity threshold and outputting defect status information further includes: If the similarity between the first transient signal and the typical defect waveform feature is greater than a preset similarity threshold, outputting state information indicating that the first area has a defect; If the similarity between the second transient signal and the typical defect waveform feature is greater than a preset similarity threshold, status information indicating that a defect exists in the second area is output.

5. A transient wave recording type distribution network overhead line monitoring system, characterized in that: include: A monitoring unit, wherein the monitoring unit is configured to: obtain a first characteristic value of a first area and a second characteristic value of a second area at the same time, wherein the first area and the second area are two different areas selected on an overhead line of a power distribution network; A phase core unit, wherein the phase core unit is configured to: obtain a phase correspondence relationship between the first region and the second region according to the first eigenvalue and the second eigenvalue; A defect judgment unit, wherein the defect judgment unit is configured to: obtain a current flow direction on an overhead line of a distribution network according to the first characteristic value, the second characteristic value and the respective corresponding relationship; The defect judgment unit is specifically configured to: arbitrarily select a phase according to the phase-to-phase correspondence relationship as a current flow direction judgment phase; Obtain the current flow direction on the overhead line of the distribution network by comparing the current amplitude of the first region and the current amplitude of the second region on the current flow direction determination phase; The monitoring unit is further configured to: obtain a first transient signal of the first area and a second transient signal of the second area; The defect judgment unit is further configured to: obtain typical defect waveform characteristics; Calculating the similarity between the first transient signal and the typical defect waveform feature, and calculating the similarity between the second transient signal and the typical defect waveform feature; Determining whether the first region and the second region have defects according to a preset similarity threshold; Output defect status information; According to the defect status information of the first area and the second area, changing the position of the first area or the second area, and continuing to determine the defect status to clarify the position causing the defect; The defect judgment unit is specifically configured to: if both the first area and the second area have defects, obtain the current flow direction on the overhead line of the distribution network; If the current on the overhead line of the distribution network flows from the first area to the second area, a new area is selected on the rear side of the second area to replace the first area; wherein, for the overhead line of the distribution network, the area through which the current flows first is called the front side, and the area through which the current flows later is called the rear side; If the current on the overhead line of the power distribution network flows from the second area to the first area, reselect an area behind the first area to replace the second area; If there are no defects in the first area and the second area, obtaining the current flow direction on the overhead line of the distribution network; If the current on the overhead line of the power distribution network flows from the first area to the second area, reselect an area in front of the first area to replace the second area; If the current on the overhead line of the power distribution network flows from the second area to the first area, reselect an area in front of the second area to replace the first area; If there is a defect in the first area and there is no defect in the second area, determining whether the defect position is clear; If the defect location is clear, output the defect location information; If the defect position is unclear, a new region is selected at the midpoint of the first region and the second region to replace the second region.

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