CN111208392B - Label-free cable collection trend identification method - Google Patents
Label-free cable collection trend identification method Download PDFInfo
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- CN111208392B CN111208392B CN202010301843.0A CN202010301843A CN111208392B CN 111208392 B CN111208392 B CN 111208392B CN 202010301843 A CN202010301843 A CN 202010301843A CN 111208392 B CN111208392 B CN 111208392B
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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Abstract
The invention provides a method and a device for identifying the trend of a label-free cable set, wherein the method comprises the following steps: determining a chip sequence of each transformer substation according to the number of the transformer substations in a predetermined area, and injecting a modulation signal carrying transformer substation information into a cable through a grounding network for transmission; and detecting and acquiring a signal carried on the cable to be detected, demodulating and restoring the injected modulation signal, confirming station information at two ends of the cable to be detected based on the correlation operation of the detection signal and the injected modulation signal on the cable to be detected, and identifying the direction of the cable. The scheme solves the problem that the existing online cable identification method cannot identify the direction of the label-free cable, can accurately identify the direction of the label-free cable, shortens the identification time, and ensures the reliability of the identification result.
Description
Technical Field
The invention relates to the field of power cable detection, in particular to a method for identifying the trend of a label-free cable collector.
Background
Along with the deepening of the urbanization process, the laying density of the power cables is increased, so that the maintenance and management of the cables are particularly important, the accurate identification of the trend and the attribution of the cables is an important premise for cable maintenance, and the accuracy of the accurate identification directly influences the safety of people and equipment.
For the identification of power cables, a great deal of research is carried out at home and abroad, and the method mainly comprises the following steps of off-line identification and on-line identification: the off-line identification mainly adopts a pulse current method, the identification accuracy is high, but the pulse signal can be loaded on the cable only by power failure; the online identification is mainly based on an electromagnetic coupling method, and because the electromagnetic coupling method is limited by the dependence of GPS synchronous signals, erroneous judgment is easily generated when the signals are unstable, so that the accuracy of cable identification is reduced; in the power cable identification method based on the electromagnetic induction principle and the double-modulation wave, the coupling signal is a high-frequency signal, so that the attenuation is large in the transmission process of the signal, and the accuracy of cable identification is influenced. In the above cable identification methods, all the methods are only suitable for obtaining the attribution tag set of the cable in advance, and when the attribution tag set of the cable cannot be obtained at all, the cable cannot be identified.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for identifying a direction of a non-tag cable, so as to solve the problem that the existing online cable identification method is difficult to identify the direction of the non-tag cable.
In a first aspect of the embodiments of the present invention, there is provided a method for identifying a direction of a tagless cable, including:
determining a chip sequence of each transformer substation according to the number of the transformer substations in a predetermined area, and injecting a modulation signal carrying transformer substation information into a cable through a grounding network for transmission;
and detecting and acquiring a signal carried on the cable to be detected, demodulating and restoring the injected modulation signal, confirming station information at two ends of the cable to be detected based on the correlation operation of the detection signal and the injected modulation signal on the cable to be detected, and identifying the direction of the cable.
In a second aspect of the embodiments of the present invention, there is provided a non-tag cable run recognition apparatus including:
the injection module is used for determining the chip sequence of each transformer substation according to the number of the transformer substations in the predetermined region, and injecting the modulation signal carrying the transformer substation information into the cable through the grounding network for transmission;
and the identification module is used for detecting and acquiring signals carried on the cable to be detected, demodulating and restoring the injected modulation signals based on the correlation operation of the detection signals and the injected modulation signals on the cable to be detected, confirming the station information at two ends of the cable to be detected and identifying the direction of the cable.
In the embodiment of the invention, the chip sequence of the transformer substation is determined according to the number of the transformer substations, and the modulation signal carrying the transformer substation information is injected into a cable through a grounding network for transmission; when the cable is detected, the injected modulation signal is demodulated and restored, and the cable trend is identified by confirming the station information at the two ends of the cable to be detected based on the correlation operation of the detection signal on the cable to be detected and the injected modulation signal. Therefore, the problem that the existing cable direction identification method cannot identify the label-free cable collector is solved, the direction of the label-free cable collector can be accurately identified, the application range of cable identification is enlarged, and the identification time is shortened. Based on code division multiple access and the correlation operation of the detection signal and the injection signal, the cable trend information can be simply and quickly obtained, and the reliability and the accuracy of the identification result are guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for identifying a direction of a non-tag cable according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a principle of a tagless cable orientation identification method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a non-tag cable collecting direction identifying device 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 in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons skilled in the art without any inventive work shall fall within the protection scope of the present invention, and the principle and features of the present invention shall be described below with reference to the accompanying drawings.
The terms "comprises" and "comprising," when used in this specification and claims, and in the accompanying drawings and figures, are intended to cover non-exclusive inclusions, such that a process, method or system, or apparatus that comprises a list of steps or elements is not limited to the listed steps or elements.
Referring to fig. 1, a schematic flow chart of a method for identifying a direction of a non-tag cable set according to an embodiment of the present invention includes:
s101, determining a chip sequence of each transformer substation according to the number of the transformer substations in a preset region, and injecting a modulation signal carrying transformer substation information into a cable through a grounding network for transmission;
the predetermined area may be an area where the cable to be tested is located or an area around the cable to be tested. The method comprises the steps of determining data of substations in each area based on the pre-defined areas, determining a chip sequence of each substation based on the number of the substations, wherein the chip sequence is m time intervals divided by one bit in Code Division Multiple Access (CDMA), and each station carries out communication transmission by using a unique m chip sequence, wherein the determination of the substation chip sequence follows the principle of code division multiple access communication. Based on code division multiple access communication, the method has strong anti-interference capability and is convenient for obtaining the transformer substation information.
The modulation signal is modulated signal data transmitted by the transformer substation, and the modulation signal comprises transformer substation information and a chip sequence corresponding to the transformer substation.
S102, detecting and acquiring a signal carried on a cable to be detected, demodulating and restoring an injected modulation signal, confirming station information at two ends of the cable to be detected based on correlation operation of the detection signal on the cable to be detected and the injected modulation signal, and identifying the direction of the cable.
And performing correlation operation on the obtained signal of the cable to be tested and the injection signal of the transformer substation, restoring the cable to be tested, determining a sender and a receiver of signal data, and obtaining the trend of the cable.
In particular, for the cable to be tested
Detected signal of
With each substation
Injected modulated signal
The result of the correlation is recorded as
Wherein:
and sequentially sequencing the modulation signals injected by each transformer substation and the detection signal operation results on the cable to be detected in a descending order, and taking the transformer substation corresponding to the first two ranked results as the head and tail stations of the cable to be detected.
In another embodiment of the present invention, as shown in fig. 2, fig. 2 is a schematic structural diagram of a method for identifying a non-tag set cable run, in fig. 2, 210 is a substation 1,220 is a substation 2, and other substations may be included, where N denotes the total number of substations in a predetermined area.
For any cable to be identified, especially a label-free cable with unknown attribution, the cable direction is determined based on the label-free set cable direction identification method.
Specifically, according to the number of the on-site transformer substations, the code division sequence corresponding to each transformer substation is determined, and the code division sequence is a string consisting of 1 and-1
The digit sequence is different for each substation and represents the site information of the station. The modulated signals are injected into all outgoing cables through a substation grounding grid to transmit the chip sequences of each station, wherein the chip sequences are different from each other, and the chip sequences are orthogonal to each other in pairs. When the chip sequence is
When a bit is present at most
Two by two mutually orthogonal chip sequences.
In an exemplary manner, the first and second electrodes are,
after calculation, the code division sequence of the substation 210, the substation 220 and the substation N can be assumed
、
、
Respectively as follows:
taking substation 210 as an example, the injection module is according to the code division sequence of substation 210 in this example
Modulating the generated injection signal and modulating the modulated signal
And the shielding layers of the cables are connected with the grounding grid, so that all outgoing cables of the transformer substation 210 can carry the station information of the previous station, wherein the coupling inductor is used for preventing the power frequency signal from entering the injection module and simultaneously ensuring that the low-frequency injection signal is smoothly coupled and enters the grounding grid.
Detecting the injected signal carried by the cable to be tested at the side of the cable to be tested
. Specifically, on the side of the cable to be identified, the injected signal is detected by a current transformer in the form of a pincer
The signal is then passed to an identification module.
And demodulating and restoring signals carried by the cable to be detected, confirming station information of the head end and the tail end of the cable to be detected, and finishing the identification of the direction of the cable.
In particular, the detected signal is detected
And a transformer substation
Injection signal of
Do the correlation operation, and mark as
And is recorded as a signal
A peak value of (d);
repeating the correlation operation until the signal
Multiplying with the injection signals of all substations;
sorting in descending order according to the size of the cable, and taking the first two substations as the cable to be identified
Head and tail stations.
By the method provided by the embodiment, each cable simultaneously carries the information of the head station and the tail station in a code division multiple access communication mode, so that the attribution label set of the cable does not need to be known in advance when the trend of the cable is identified. Meanwhile, the code division multiple access mode can effectively reduce the influence of a complex electromagnetic environment on the transmission of the injected signals and enhance the anti-interference capability of the signals, so that the invention can accurately and reliably finish the identification of the trend of the label-free cable collector without additional power failure.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
On the basis of fig. 2, fig. 3 is a schematic structural diagram of a non-label cable direction identification device according to an embodiment of the present invention, where the device includes:
the injection module 310 is configured to determine a chip sequence of each substation according to the number of substations in a predetermined area, and inject a modulation signal carrying substation information into a cable through a ground grid for transmission;
and the chip sequence of each substation follows a code division multiple access coding mode.
The identification module 320 is configured to detect and acquire a signal carried on a cable to be detected, demodulate and restore the injected modulation signal, confirm station information at two ends of the cable to be detected based on a correlation operation between the detection signal on the cable to be detected and the injected modulation signal, and identify a cable direction.
Optionally, for the cable to be tested
Detected signal of
With each substation
Injected modulated signal
The result of the correlation is recorded as
Wherein:
and sequentially sequencing the modulation signals injected by each transformer substation and the detection signal operation results on the cable to be detected in a descending order, and taking the transformer substation corresponding to the first two ranked results as the head and tail stations of the cable to be detected.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for identifying the trend of a label-free cable collector is characterized by comprising the following steps:
determining a chip sequence of each transformer substation according to the number of the transformer substations in a predetermined area, and injecting a modulation signal carrying transformer substation information into a cable through a grounding network for transmission;
and detecting and acquiring a signal carried on the cable to be detected, demodulating and restoring the injected modulation signal, confirming station information at two ends of the cable to be detected based on the correlation operation of the detection signal and the injected modulation signal on the cable to be detected, and identifying the direction of the cable.
2. The method of claim 1, wherein the sequence of chips for each substation follows a code division multiple access encoding scheme.
3. The method according to claim 1, wherein the confirming of the station information at the two ends of the cable under test based on the correlation operation between the detection signal on the cable under test and the injected modulation signal is specifically:
for cables to be tested
Detected signal of
With each substation
Injected modulated signal
The result of the correlation is recorded as
Wherein:
and sequentially sequencing the modulation signals injected by each transformer substation and the detection signal operation results on the cable to be detected in a descending order, and taking the transformer substation corresponding to the first two ranked results as the head and tail stations of the cable to be detected.
4. A tagless cable collection orientation identification apparatus, comprising:
the injection module is used for determining the chip sequence of each transformer substation according to the number of the transformer substations in the predetermined region, and injecting the modulation signal carrying the transformer substation information into the cable through the grounding network for transmission;
and the identification module is used for detecting and acquiring signals carried on the cable to be detected, demodulating and restoring the injected modulation signals, confirming station information at two ends of the cable to be detected based on the correlation operation of the detection signals and the injected modulation signals on the cable to be detected, and identifying the direction of the cable.
5. The apparatus of claim 4, wherein the sequence of chips for each substation follows a code division multiple access encoding scheme.
6. The apparatus according to claim 4, wherein the station information for confirming the two ends of the cable under test based on the correlation operation between the detection signal on the cable under test and the injected modulation signal is specifically:
for cables to be tested
Detected signal of
With each substation
Injected modulated signal
The result of the correlation is recorded as
Wherein:
and sequentially sequencing the modulation signals injected by each transformer substation and the detection signal operation results on the cable to be detected in a descending order, and taking the transformer substation corresponding to the first two ranked results as the head and tail stations of the cable to be detected.
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| CN111783909A (en) * | 2020-06-09 | 2020-10-16 | 南京葛南实业有限公司 | Intelligent identification method, system and device |
| CN112305620A (en) * | 2020-10-30 | 2021-02-02 | 贵州电网有限责任公司 | Cable hunting recognition device and hunting method |
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