CN116106687A - Outdoor cable defect investigation method and system - Google Patents
Outdoor cable defect investigation method and system Download PDFInfo
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- CN116106687A CN116106687A CN202310355282.6A CN202310355282A CN116106687A CN 116106687 A CN116106687 A CN 116106687A CN 202310355282 A CN202310355282 A CN 202310355282A CN 116106687 A CN116106687 A CN 116106687A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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Abstract
The invention provides an outdoor cable defect investigation method and system, comprising the steps of sequentially numbering and classifying cables according to the arrangement level and the position of the cables in a cable trench to obtain a plurality of cable sections; acquiring an external sensing signal and an internal sensing signal of a cable duct; the fault cable area is preliminarily determined according to the external sensing signal and/or the internal sensing signal; performing fault scanning on the fault cable areas determined by different signal types so as to determine fault points of the cable, wherein the fault scanning area is calculated by the set scanning area proportion corresponding to the different signal types; and acquiring image data of the fault points, performing defect analysis, and reporting the obtained defect types. According to the invention, after the fault area of the cable is primarily determined by utilizing the internal and external sensing signals, the fault point is secondarily determined by means of fault scanning, so that the checking time of a cable duct can be saved, and the working efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of cable protection, and particularly relates to an outdoor cable defect investigation method and system.
Background
At present, a large number of primary or secondary cables exist in an outdoor cable trench of a transformer substation, and the primary or secondary cables are used as a ring of a transformer substation defense area and are affected by various small animals besides natural conditions due to the outdoor environment, and although the outer layer of the cable can be well adapted to the environments, hidden danger points still exist on the surface due to a series of external factors such as construction and the like, so that the problems are bound to occur in the places for a long time.
The existing cable defect processing and searching method can only start from the source along the whole loop, gradually shortens the searching area by adopting a segmented measurement method, and finally locks the target, but the cable is arranged in disorder, the searching efficiency is low, and the defect elimination is influenced.
Disclosure of Invention
In view of the above, the invention aims to solve the problems that the existing cable defect checking method is low in efficiency and affects the defect eliminating speed.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides an outdoor cable defect inspection method, including the steps of:
sequentially numbering and classifying cables according to the arrangement layers and positions of the cables in the cable trench to obtain a plurality of cable sections;
the method comprises the steps of obtaining an external sensing signal and an internal sensing signal of a cable duct, wherein the external sensing signal is a signal sent when an abnormality occurs in an external sensing cable section of the cable duct, and the internal sensing signal is a signal sent when an abnormality occurs in a local position of the internal sensing cable section of the cable duct;
judging whether the abnormal positions of the cables corresponding to the external sensing signals and the internal sensing signals are coincident, if so, primarily determining a fault cable area according to the internal sensing signals, and if not, primarily determining the fault cable area according to the external sensing signals and/or the internal sensing signals;
performing fault scanning on the fault cable areas determined by different signal types so as to determine fault points of the cable, wherein the fault scanning area is calculated by the set scanning area proportion corresponding to the different signal types;
and acquiring image data of the fault points, performing defect analysis, and reporting the obtained defect types.
Further, the expression for determining the faulty cable area based on the external or internal sensing signal is specifically as follows:
in the method, in the process of the invention,
for the number of abnormal cable segments determined from the external sense signal, L is the total length, < >>
Is->
Position coordinate function of section cable, < >>
For the number of abnormal cable segments determined from the internal sense signal.
Further, the fault cable area determined by the different signal types is specifically as follows:
in the method, in the process of the invention,
and the cable abnormal position superposition area corresponding to the external sensing signal and the internal sensing signal is represented.
Further, the set scanning area ratios corresponding to different signal types are specifically:
when only the external sensing signal is applied, the scanned area and the unscanned area are 1:2;
when only the internal sense signal is applied, the scanned area and the unscanned area are 1:1, a step of;
when the internal and external sensing signals exist at the same time, if the overlapping area exists, all the overlapping areas are scanned, and other areas are set according to the scanning area proportion corresponding to different signal types.
Further, when fault scanning is performed on the fault cable area determined by different signal types, the scanning area is specifically as follows:
wherein S is the scanning area corresponding to the cable section.
In a second aspect, the present invention provides an outdoor cable defect inspection system, comprising:
the cable dividing unit is used for sequentially numbering and classifying the cables according to the arrangement level and the position of the cables in the cable trench to obtain a plurality of cable sections;
the cable monitoring unit is used for acquiring an external sensing signal and an internal sensing signal of the cable duct, wherein the external sensing signal is a signal sent when the external sensing cable section of the cable duct is abnormal, and the internal sensing signal is a signal sent when the local position of the internal sensing cable section of the cable duct is abnormal; the method is also used for judging whether the abnormal positions of the cables corresponding to the external sensing signals and the internal sensing signals are coincident, if yes, the fault cable area is primarily determined according to the internal sensing signals, and if not, the fault cable area is primarily determined according to the external sensing signals and/or the internal sensing signals;
the fault scanning unit is used for carrying out fault scanning on the fault cable area determined by different signal types so as to determine a fault point of the cable, and the fault scanning area is calculated by the set scanning area proportion corresponding to the different signal types;
the abnormal reporting unit is used for acquiring the image data of the fault point and carrying out defect analysis, and reporting the obtained defect type.
Further, in the cable monitoring unit, the expression for determining the faulty cable area based on the external sense signal or the internal sense signal is specifically as follows:
in the method, in the process of the invention,
for the number of abnormal cable segments determined from the external sense signal, L is the total length, < >>
Is->
Position coordinate function of section cable, < >>
For the number of abnormal cable segments determined from the internal sense signal.
Further, in the cable monitoring unit, the fault cable area determined by different signal types is specifically as follows:
in the method, in the process of the invention,
and the cable abnormal position superposition area corresponding to the external sensing signal and the internal sensing signal is represented.
Further, in the fault scanning unit, the set scanning area ratios corresponding to different signal types are specifically:
when only the external sensing signal is applied, the scanned area and the unscanned area are 1:2;
when only the internal sense signal is applied, the scanned area and the unscanned area are 1:1, a step of;
when the internal and external sensing signals exist at the same time, if the overlapping area exists, all the overlapping areas are scanned, and other areas are set according to the scanning area proportion corresponding to different signal types.
Further, in the fault scanning unit, when fault scanning is performed on the fault cable area determined by different signal types, the scanning area is specifically as follows:
wherein S is the scanning area corresponding to the cable section.
In summary, the invention provides an outdoor cable defect investigation method and system, comprising the steps of sequentially numbering and classifying cables according to the arrangement level and the position of the cables in a cable trench to obtain a plurality of cable sections; acquiring an external sensing signal and an internal sensing signal of a cable duct; the fault cable area is preliminarily determined according to the external sensing signal and/or the internal sensing signal; performing fault scanning on the fault cable areas determined by different signal types so as to determine fault points of the cable, wherein the fault scanning area is calculated by the set scanning area proportion corresponding to the different signal types; and acquiring image data of the fault points, performing defect analysis, and reporting the obtained defect types. According to the invention, after the fault area of the cable is primarily determined by utilizing the internal and external sensing signals, the fault point is secondarily determined by means of fault scanning, so that the checking time of a cable duct can be saved, and the working efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an outdoor cable defect inspection method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating fault scanning according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present embodiment provides an outdoor cable defect inspection method, which includes the following steps:
s100: and sequentially numbering and classifying the cables according to the arrangement layers and positions of the cables in the cable trench to obtain a plurality of cable sections.
It will be appreciated that the purpose of numbering and categorizing the cables is to facilitate the quick acquisition of the location information and type of the cables by the staff. In this embodiment, a cable numbering and classifying manner is provided, specifically, 3D cable arrangement layers and positions inside the whole cable trench are constructed through a video terminal system, and the cables are sequentially numbered and classified, a label and a space mapping are adopted in the numbering (i) manner, the label is the cable trench cover plate number, the space mapping is to two-dimensionally compress a three-dimensional cable trench, and the space mapping is embodied on a compression axis through a layer symbol. The classification includes secondary or primary cables, numbering, etc. And after each reconstruction or construction work is completed, the video terminal system updates the data.
S200: the method comprises the steps of obtaining an external sensing signal and an internal sensing signal of a cable duct, wherein the external sensing signal is a signal sent when an abnormality occurs in an external sensing cable section of the cable duct, and the internal sensing signal is a signal sent when an abnormality occurs in a local position of the internal sensing cable section of the cable duct.
It should be noted that, in this step, the obtained external signal perception Y (i) and the source cable pit internally perceived signal N (i), where (i) is a correlation number. The external signal perception is related loop related signals sent by a background monitoring system or a remote system, such as XX line grounding signals, XX insulation reduction signals and the like. The second part is derived from a monitor arranged in the cable trench, such as a fiber optic temperature sensor, which can upload measured abnormal temperature data, etc.
S300: judging whether the abnormal positions of the cables corresponding to the external sensing signals and the internal sensing signals are coincident, if so, primarily determining a fault cable area according to the internal sensing signals, and if not, primarily determining the fault cable area according to the external sensing signals and/or the internal sensing signals.
It should be noted that, when only external signals are perceived, the defect localization area is a continuous domain. When only internal perception, the defect localization areas are discrete block domains. When only one signal type is present, the determination of the fault region is made in accordance with that signal. And when there is both external signal perception and internal perception, there is an overlap region with respect to the external perception Y (i) related domain and the internal perception N (i), i.e
The overlapping area of the internal perception N (i) and the external signal perception Y (i) only considers the internal perception area, and the rest part is respectively considered; if there is no overlap between the domain of the inner perception N (i) and the domain of the outer perception Y (i)>
Both are considered separately. Where n and k represent the number of cables affected by the perception of the two signals, respectively.
S400: and carrying out fault scanning on the fault cable areas determined by different signal types so as to determine fault points of the cable, wherein the fault scanning area is calculated by the set scanning area proportion corresponding to the different signal types.
After the positioning area is determined initially, the secondary positioning is performed at the initial area by using a nondestructive testing device (such as an X-ray detection device) carried by the tunnel robot, so that time and efficiency are considered, and a scanning strategy adopted by the secondary positioning can be set according to different combinations of signal types.
S500: and acquiring image data of the fault points, performing defect analysis, and reporting the obtained defect types.
It should be noted that, the reporting process should be performed for the whole defect inspection process, that is, the problem points to be inspected need to be reported, and other problems in the inspection process need to be reported. The embodiment provides a reporting process flow, specifically, after the secondary positioning is successful, further utilizing a tunnel robot visual system to collect images, and uploading the collected images to a defect analysis reporting system. If the secondary positioning is unsuccessful, distinguishing and judging whether the scanning initial phase is required to be adjusted again according to the fault signal to scan, and if the secondary positioning is still impossible after the external signal is sensed to scan for three times, judging that the fault does not exist in the cable pit area. After the internal signal is sensed and scanned for two times, the positioning is still impossible, and the information is judged to be an error abnormal signal. When both conditions exist at the same time and a fault cannot be scanned, an error abnormal signal is reported or a cable duct area does not exist. And finally, analyzing the acquired image information, performing image clustering analysis according to the characteristic data, dividing the image information into natural defect types, animal invasion types and the like, reporting the analysis condition, and then timely processing. Fig. 2 is a workflow of fault scanning in this flow.
The embodiment provides an outdoor cable defect investigation method, which comprises the steps of sequentially numbering and classifying cables according to arrangement layers and positions of cables in a cable trench to obtain a plurality of cable sections; acquiring an external sensing signal and an internal sensing signal of a cable duct; the fault cable area is preliminarily determined according to the external sensing signal and/or the internal sensing signal; performing fault scanning on the fault cable areas determined by different signal types so as to determine fault points of the cable, wherein the fault scanning area is calculated by the set scanning area proportion corresponding to the different signal types; and acquiring image data of the fault points, performing defect analysis, and reporting the obtained defect types. According to the embodiment, after the fault area of the cable is primarily determined by utilizing the internal and external sensing signals, the fault point is secondarily determined by means of fault scanning, so that the checking time of a cable duct can be saved, and the working efficiency is improved.
In another embodiment of the invention, the expression for determining the faulty cable zone based on the external or internal sensing signal is specifically as follows:
in the method, in the process of the invention,
for the number of abnormal cable segments determined from the external sense signal, L is the total length, < >>
Is->
Position coordinate function of section cable, < >>
For the number of abnormal cable segments determined from the internal sense signal.
According to the determination mode of the fault area under different signal types, when the fault area is only perceived by external signals, the defect positioning area is a continuous area, and the expression is that
Wherein->
For the position coordinate function of the corresponding cabling number, the expression is +.>
The method comprises the steps of carrying out a first treatment on the surface of the When only the internal perception is present, the defect localization area is a discrete block domain expressed as +.>
When there is both external signal perception and internal perception, if there is an overlap region between the Y (i) related domain and the internal perception N (i), then +.>
The table in which the overlapping area of the internal sense N (i) and the external signal sense Y (i) is considered only the internal sense area and the rest are considered separatelyThe expression is as follows: />
. If there is no overlap between the domain of the inner perception N (i) and the domain of the outer perception Y (i)>
Then both are considered separately, the expression is as follows:
. Where n and k represent the number of cables affected by the perception of the two signals, respectively.
The expression for preliminarily determining the fault region according to the above knowledge is specifically as follows:
in the method, in the process of the invention,
and the cable abnormal position superposition area corresponding to the external sensing signal and the internal sensing signal is represented.
In another embodiment of the present invention, the set scan area ratio corresponding to different signal types is specifically:
when only the external sensing signal is applied, the scanned area and the unscanned area are 1:2;
when only the internal sense signal is applied, the scanned area and the unscanned area are 1:1, a step of;
when the internal and external sensing signals exist at the same time, if the overlapping area exists, all the overlapping areas are scanned, and other areas are set according to the scanning area proportion corresponding to different signal types.
Namely, when the external signal is sensed only, the scanned area and the non-scanned area are 1:2, and the total scanned area is
，/>
Is only the total area under the perception of external signalsDomain area size, in particular
D is the cable diameter (mm); when the internal perception is only adopted, the scanning area and the non-scanning area are 1:1, and the total scanning area is +.>
，/>
Is the total area size under the internal signal perception, when the external signal perception and the internal perception exist simultaneously, the overlapping area exists between the 1.Y (i) related domain and the internal perception N (i), namely +.>
The overlapping area of the internal perception N (i) and the external signal perception Y (i) needs to be scanned completely, and the rest two are considered respectively, and the expression is as follows: />
2 if there is no overlap between the domain associated with the internal perception N (i) and the external perception Y (i)>
Then both are considered separately, the expression is as follows:
according to the above, when fault scanning is performed on the fault cable area determined by different signal types, the scanning area is specifically as follows:
wherein S is the scanning area corresponding to the cable section or the local position of the cable.
The foregoing is a detailed description of an embodiment of an outdoor cable defect inspection method according to the present invention, and the following detailed description of an embodiment of an outdoor cable defect inspection system according to the present invention will be given.
The embodiment provides an outdoor cable defect inspection system, including: the system comprises a cable dividing unit, a cable monitoring unit, a fault scanning unit and an abnormality reporting unit.
In this embodiment, the cable dividing unit is configured to sequentially number and classify cables according to the arrangement level and the position of the cables in the cable trench, so as to obtain a plurality of cable segments;
in this embodiment, the cable monitoring unit is configured to obtain an external sensing signal and an internal sensing signal of the cable duct, where the external sensing signal is a signal sent when an abnormality occurs in an external sensing cable section of the cable duct, and the internal sensing signal is a signal sent when an abnormality occurs in a local position of the internal sensing cable section of the cable duct; the method is also used for judging whether the abnormal positions of the cables corresponding to the external sensing signals and the internal sensing signals are coincident, if yes, the fault cable area is primarily determined according to the internal sensing signals, and if not, the fault cable area is primarily determined according to the external sensing signals and/or the internal sensing signals;
in this embodiment, the fault scanning unit is configured to perform fault scanning on the fault cable area determined by different signal types, so as to determine a fault point of the cable, where the area of fault scanning is calculated by a set scanning area ratio corresponding to the different signal types;
in this embodiment, the anomaly reporting unit is configured to obtain image data of a fault point, perform defect analysis, and report the obtained defect type.
Further, in the cable monitoring unit, the expression for determining the faulty cable area based on the external sense signal or the internal sense signal is specifically as follows:
in the method, in the process of the invention,
for the number of abnormal cable segments determined from the external sense signal, L is the total length, < >>
Is->
Position coordinate function of section cable, < >>
For the number of abnormal cable segments determined from the internal sense signal.
Further, in the cable monitoring unit, the fault cable area determined by different signal types is specifically as follows:
in the method, in the process of the invention,
and the cable abnormal position superposition area corresponding to the external sensing signal and the internal sensing signal is represented.
Further, in the fault scanning unit, the set scanning area ratios corresponding to different signal types are specifically:
when only the external sensing signal is applied, the scanned area and the unscanned area are 1:2;
when only the internal sense signal is applied, the scanned area and the unscanned area are 1:1, a step of;
when the internal and external sensing signals exist at the same time, if the overlapping area exists, all the overlapping areas are scanned, and other areas are set according to the scanning area proportion corresponding to different signal types.
Further, in the fault scanning unit, when fault scanning is performed on the fault cable area determined by different signal types, the scanning area is specifically as follows:
wherein S is the scanning area corresponding to the cable section.
It should be noted that, the inspection system provided in this embodiment is used to implement the inspection method provided in the foregoing embodiment, and specific setting of each unit is based on the complete method, which is not described herein again.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The outdoor cable defect investigation method is characterized by comprising the following steps of:
sequentially numbering and classifying cables according to the arrangement layers and positions of the cables in the cable trench to obtain a plurality of cable sections;
the method comprises the steps of obtaining an external sensing signal and an internal sensing signal of a cable duct, wherein the external sensing signal is a signal sent when an abnormality occurs in an external sensing cable section of the cable duct, and the internal sensing signal is a signal sent when an abnormality occurs in a local position of the internal sensing cable section of the cable duct;
judging whether the abnormal positions of the cables corresponding to the external sensing signals and the internal sensing signals are overlapped, if yes, primarily determining a fault cable area according to the internal sensing signals, and if not, primarily determining the fault cable area according to the external sensing signals and/or the internal sensing signals;
performing fault scanning on the fault cable areas determined by different signal types so as to determine fault points of the cable, wherein the fault scanning area is calculated by the set scanning area proportion corresponding to the different signal types;
and acquiring image data of the fault points, performing defect analysis, and reporting the obtained defect types.
2. The outdoor cable fault investigation method according to claim 1, wherein the expression for determining a faulty cable area based on the external or internal sensing signal is specifically as follows:
in the method, in the process of the invention,
for the number of abnormal cable segments determined from the external sense signal, L is the total length, < >>
Is->
Position coordinate function of section cable, < >>
For the number of abnormal cable segments determined from the internal sense signal.
3. The outdoor cable fault detection method according to claim 2, wherein the faulty cable zone determined by the different signal types is specifically as follows:
in the method, in the process of the invention,
and the cable abnormal position superposition area corresponding to the external sensing signal and the internal sensing signal is represented.
4. The outdoor cable fault detection method according to claim 3, wherein the set scanning area ratios corresponding to different signal types are specifically:
when only the external sensing signal is applied, the scanned area and the unscanned area are 1:2;
when only the internal sense signal is applied, the scanned area and the unscanned area are 1:1, a step of;
when the internal and external sensing signals exist at the same time, if the overlapping area exists, all the overlapping areas are scanned, and other areas are set according to the scanning area proportion corresponding to different signal types.
5. The outdoor cable fault detection method according to claim 4, wherein when fault scanning is performed on a faulty cable area determined by different signal types, the scanning area is specifically as follows:
wherein S is the scanning area corresponding to the cable section.
6. An outdoor cable defect inspection system, comprising:
the cable dividing unit is used for sequentially numbering and classifying the cables according to the arrangement level and the position of the cables in the cable trench to obtain a plurality of cable sections;
the cable monitoring unit is used for acquiring an external sensing signal and an internal sensing signal of the cable duct, wherein the external sensing signal is a signal sent when the external sensing cable section of the cable duct is abnormal, and the internal sensing signal is a signal sent when the local position of the internal sensing cable section of the cable duct is abnormal; the method is also used for judging whether the abnormal positions of the cables corresponding to the external sensing signals and the internal sensing signals coincide, if so, primarily determining a fault cable area according to the internal sensing signals, and if not, primarily determining the fault cable area according to the external sensing signals and/or the internal sensing signals;
the fault scanning unit is used for carrying out fault scanning on the fault cable area determined by different signal types so as to determine a fault point of the cable, and the fault scanning area is calculated by the set scanning area proportion corresponding to the different signal types;
the abnormal reporting unit is used for acquiring the image data of the fault point and carrying out defect analysis, and reporting the obtained defect type.
7. The outdoor cable fault screening system of claim 6, wherein in the cable monitoring unit, an expression for determining a faulty cable zone based on the external or internal sensing signal is specified as follows:
in the method, in the process of the invention,
for the number of abnormal cable segments determined from the external sense signal, L is the total length, < >>
Is->
Position coordinate function of section cable, < >>
For the number of abnormal cable segments determined from the internal sense signal.
8. The outdoor cable fault detection system of claim 7, wherein in said cable monitoring unit, the faulty cable zone determined by the different signal types is specifically as follows:
in the method, in the process of the invention,
and the cable abnormal position superposition area corresponding to the external sensing signal and the internal sensing signal is represented.
9. The outdoor cable fault detection system of claim 8, wherein in said fault scanning unit, the set scanning area ratios corresponding to different signal types are specifically:
when only the external sensing signal is applied, the scanned area and the unscanned area are 1:2;
when only the internal sense signal is applied, the scanned area and the unscanned area are 1:1, a step of;
when the internal and external sensing signals exist at the same time, if the overlapping area exists, all the overlapping areas are scanned, and other areas are set according to the scanning area proportion corresponding to different signal types.
10. The outdoor cable fault detection system according to claim 9, wherein, in the fault scanning unit, when fault scanning is performed on a fault cable area determined by different signal types, a scanning area is specifically as follows:
wherein S is the scanning area corresponding to the cable section.
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| CN116106687B (en) | 2023-06-09 |
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