CN115047298A - Defect signal enhancement system and method for instrument control multi-core cable of nuclear power station - Google Patents
Defect signal enhancement system and method for instrument control multi-core cable of nuclear power station Download PDFInfo
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- CN115047298A CN115047298A CN202210486726.5A CN202210486726A CN115047298A CN 115047298 A CN115047298 A CN 115047298A CN 202210486726 A CN202210486726 A CN 202210486726A CN 115047298 A CN115047298 A CN 115047298A
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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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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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention relates to a defect signal enhancement system and method for an instrument control multi-core cable of a nuclear power station, which comprises the following steps: the system comprises a signal design unit, a cable core processing unit, a signal acquisition unit, a data processing unit and a defect positioning unit; the signal design unit outputs an incident signal; the cable core processing unit controls the connection between the central cable core of the multi-core cable to be tested and the cable core to be tested so as to enhance the reflection signal of the cable core to be tested; the signal acquisition unit acquires the incident signal output by the signal design unit and the reflected signal generated by the cable core to be tested, and respectively converts the acquired incident signal and reflected signal into data signals; the data processing unit processes the data signal; and the defect positioning unit is used for positioning the defects according to the data processed by the data processing unit. The invention can effectively enhance the reflected signal of the defective cable core, thereby greatly improving the accuracy of defect positioning.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a defect signal enhancement system and method for an instrument control multi-core cable of a nuclear power station.
Background
At present, the insulation degradation state assessment of the nuclear power station on the safety and reliability of the instrument control cable still lacks corresponding standards, in order to ensure the safe and stable operation of the nuclear power station, the defect diagnosis of the instrument control cable in the nuclear power station needs to be carried out regularly, the potential cable defect hazards which may exist are found in time, the treatment is carried out in time, and the accident is avoided.
The following types of possible defects of instrumentation cables are probably available: extrusion, virtual joint, aging, outer skin damage, etc. The extrusion may be extrusion among cable groups, or local extrusion and bending of the cables under the pressure of the external environment; the virtual connection can be formed by the overall dislocation and rotation of the cable; the aging is caused by the influence of heat when the cable runs under long-term load. These typical defects can cause the electrical or physical properties of the cable to change, resulting in impedance anomalies, such that the signal is reflected and refracted at the impedance anomaly points, and therefore, the cable defects can be localized by traveling wave detection.
However, signals are attenuated in the cable transmission process, impedance abnormity caused by tiny defects is small, peaks of reflected signals are difficult to detect, and accuracy of defect positioning is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a system and a method for enhancing a defect signal of an instrument control multi-core cable of a nuclear power station aiming at the defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a defect signal enhancement system for a nuclear power plant instrument control multi-core cable, comprising: the system comprises a signal design unit, a cable core processing unit, a signal acquisition unit, a data processing unit and a defect positioning unit;
the cable core processing unit is respectively connected with the signal design unit, the signal acquisition unit and the multi-core cable to be detected, and the data processing unit is respectively connected with the signal acquisition unit and the defect positioning unit;
the signal design unit is used for designing a reference signal according to the attribute of the multi-core cable to be tested and outputting an incident signal based on the reference signal;
the cable core processing unit is used for controlling the connection between the central cable core of the multi-core cable to be tested and the cable core to be tested so as to enhance the reflection signal of the cable core to be tested;
the signal acquisition unit is used for acquiring the incident signal output by the signal design unit and the reflected signal generated by the cable core to be tested, and respectively converting the acquired incident signal and the acquired reflected signal into data signals;
the data processing unit is used for processing the data signal;
and the defect positioning unit is used for positioning defects according to the data processed by the data processing unit.
In the system for enhancing the defect signal of the instrument-controlled multi-core cable of the nuclear power station, the cable core processing unit includes: a cable core measuring module;
the cable core measuring module is respectively connected with the signal design unit, the signal acquisition unit and the head end of the peripheral cable core of the multi-core cable to be measured; the peripheral cable cores are all cable cores except the central cable core in the multi-core cable to be tested;
and the cable core measuring module is used for completing the connection or disconnection of the head end of the peripheral cable core with the signal design unit and the signal acquisition module.
In the system for enhancing the defect signal of the instrument-controlled multi-core cable of the nuclear power station, the cable core measuring module comprises: a plurality of output switches;
and the first end of each output switch is connected with the input end of the signal acquisition unit and the output end of the signal design unit, and the second end of each output switch is connected with the head end of the corresponding peripheral cable core.
In the defect signal enhancement system of the nuclear power station instrument control multi-core cable, each output switch is in a normally open state, and when defect positioning is carried out, the output switch corresponding to the cable core to be detected is closed, and the other output switches are kept in the normally open state.
In the system for enhancing the defect signal of the instrument-controlled multi-core cable of the nuclear power station, the cable core processing unit further includes: the cable core is connected with the module;
the cable core connecting module is connected with the tail end of the peripheral cable core and the central cable core and used for realizing connection or disconnection of the cable core to be tested.
In the defect signal enhancement system for the instrument-controlled multi-core cable of the nuclear power station, the cable core connection module comprises: a plurality of input switches and a common connector;
the first end of each input switch is connected with the tail end of the corresponding peripheral cable core, the second end of each input switch is connected with the second end of the public connector, and the first end of the public connector is connected with the tail end of the central cable core.
In the defect signal enhancement system of the nuclear power station instrument control multi-core cable, each input switch is in a normally open state, and when defect positioning is carried out, the input switch corresponding to the cable core to be detected is closed, and the other input switches are kept in the normally open state.
In the defect signal enhancement system of the nuclear power station instrument control multi-core cable, when defect positioning is carried out, a closed output switch in the cable core measuring module corresponds to a closed input switch in the cable core connecting module.
The defect signal enhancement system of the instrument control multi-core cable of the nuclear power station further comprises: the control unit is respectively connected with the cable core measuring module and the cable core connecting module;
the control unit is used for controlling the on/off states of an output switch in the cable core measuring module and an input switch in the cable core connecting module.
The invention also provides a method for enhancing the defect signal of the instrument control multi-core cable of the nuclear power station, which comprises the following steps:
determining a cable core to be tested;
controlling the on-off of the cable core processing unit so as to connect the cable core to be tested with the central cable core in series;
controlling the signal design unit to output an incident signal;
acquiring the incident signal and the reflected signal of the cable core to be detected through a signal acquisition unit, and respectively converting the acquired incident signal and the acquired reflected signal into data signals through the signal acquisition unit;
the data processing unit receives and processes the data signal;
and the defect positioning unit is used for positioning the defects according to the signals processed by the data processing unit.
The system and the method for enhancing the defect signal of the instrument control multi-core cable of the nuclear power station have the following beneficial effects: the method comprises the following steps: the system comprises a signal design unit, a cable core processing unit, a signal acquisition unit, a data processing unit and a defect positioning unit; the signal design unit outputs an incident signal; the cable core processing unit controls the connection between the central cable core of the multi-core cable to be tested and the cable core to be tested so as to enhance the reflection signal of the cable core to be tested; the signal acquisition unit acquires an incident signal output by the signal design unit and a reflected signal generated by the cable core to be tested, and converts the acquired incident signal and reflected signal into data signals respectively; the data processing unit processes the data signal; and the defect positioning unit is used for positioning the defects according to the data processed by the data processing unit. The invention can effectively enhance the reflected signal of the defective cable core, thereby greatly improving the accuracy of defect positioning.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural diagram of a defect signal enhancement system for an instrument-controlled multi-core cable of a nuclear power plant according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a method for enhancing a defect signal of an instrument-controlled multi-core cable of a nuclear power plant according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an incident signal according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a reflected signal of the peripheral cable core according to the embodiment of the present invention;
fig. 5 is a schematic diagram of a reflected signal of the central cable core according to the embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The defect signal enhancement system and the method of the nuclear power station instrument control multi-core cable can effectively enhance the reflection signals of each cable core aiming at the condition that a plurality of outer rotating cable cores surround one central cable core by utilizing the magnetic field correlation effect among the plurality of cable cores, thereby improving the accuracy of defect positioning.
Specifically, as shown in fig. 1, the system for enhancing the defect signal of the instrument-controlled multi-core cable of the nuclear power plant includes: the system comprises a signal design unit 12, a cable core processing unit 11, a signal acquisition unit 13, a data processing unit 14 and a defect positioning unit 15.
The cable core processing unit 11 is respectively connected with the signal design unit 12, the signal acquisition unit 13 and the multi-core cable 10 to be tested, and the data processing unit 14 is respectively connected with the signal acquisition unit 13 and the defect positioning unit 15.
Optionally, in this embodiment of the present invention, as shown in fig. 1, the cable core processing unit 11 includes: and a cable core measuring module 111.
The cable core measuring module 111 is connected to the signal designing unit 12, the signal acquiring unit 13, and the head end of the peripheral cable core of the multi-core cable 10 to be measured. The peripheral cable cores are all the cable cores except the central cable core in the multi-core cable 10 to be tested. The signal pairs of the central cable core and the epicyclic cable core are shown in fig. 4 and 5.
In the embodiment of the present invention, the cable core measuring module 111 is configured to complete connection or disconnection between the head end of the peripheral cable core and the signal design unit 12 and the signal acquisition module.
Optionally, in this embodiment of the present invention, the cable core measurement module 111 includes: a plurality of output switches.
The first end of each output switch is connected with the input end of the signal acquisition unit 13 and the output end of the signal design unit 12, and the second end of each output switch is connected with the head end of the corresponding peripheral cable core.
Each output switch is in a normally open state, and when defect positioning is carried out, the output switch corresponding to the cable core to be tested is closed, and other output switches are kept in the normally open state.
Further, as shown in fig. 1, the cable core processing unit 11 further includes: cable core connection module 112.
The cable core connecting module 112 is connected with the tail end of the peripheral cable core and the central cable core and is used for realizing connection or disconnection of the cable core to be tested.
Optionally, in this embodiment of the present invention, the cable core connection module 112 includes: a plurality of input switches and a common connector P.
The first end of each input switch is connected with the tail end of the corresponding peripheral cable core, the second end of each input switch is connected with the second end of the public connector P, and the first end of the public connector P is connected with the tail end of the central cable core.
Each input switch is in a normally open state, and when defect positioning is carried out, the input switches corresponding to the cable cores to be tested are closed, and other input switches are kept in the normally open state.
In the embodiment of the present invention, when defect location is performed, the closed output switch in the cable core measurement module 111 corresponds to the closed input switch in the cable core connection module 112.
Further, in the embodiment of the present invention, the system for enhancing a defect signal of an instrument-controlled multi-core cable of a nuclear power plant further includes: and the control unit 16 is respectively connected with the cable core measuring module 111 and the cable core connecting module 112.
The control unit 16 is used to control the on/off states of the output switch in the cable core measurement module 111 and the input switch in the cable core connection module 112.
Specifically, as shown in fig. 1, the control unit 16 is connected to each output switch in the cable core measurement module 111 and each input switch in the cable core connection module 112, so as to control the on/off state of each output switch and each input switch.
In the embodiment of the invention, the cable core processing module is used for performing electromagnetic field enhancement by surrounding the central cable core with the plurality of peripheral cable cores, so that the signal intensity of the central cable core is obviously enhanced compared with that of the peripheral cable cores when the same incident signal is used for performing time domain reflection under the same condition. At the moment, the reflected signal of the central cable core can be enhanced, then the central cable core is connected with one of the peripheral cable cores (namely, the cable core to be detected) in series, so that the signal intensity of the cable core to be detected is obviously improved compared with that of the cable core to be detected, namely, the signal intensity of the peripheral cable core is driven by the signal intensity of the central cable core, and the defective reflected wave peak value is improved.
It should be noted that the incident signal needs to be input from the head end of the cable core to be tested, so as to avoid the increase of signal attenuation caused by the increase of distance.
In the embodiment of the invention, when the peripheral cable core and the central cable core are connected in series, the peripheral cable core and the central cable core are in impedance matching, so that the defect detection accuracy is prevented from being influenced by a reflection peak generated at the series connection part, and the defect positioning accuracy is further improved.
In the embodiment of the present invention, each output switch in the cable core measurement module 111 is labeled with a number, and similarly, the peripheral cable cores connected to the output switches are also numbered in advance, so as to implement association and one-to-one correspondence between the output switches and the peripheral cable cores connected to the output switches. Similarly, each input switch arranged at the tail end of the cable core of the cable to be tested is also marked with a number, and the number corresponds to the output switch at the head end of the cable core of the cable to be tested.
Optionally, in the embodiment of the present invention, both the output switch and the input switch may adopt electronic switches.
Specifically, as shown in fig. 1, the multi-core cable 10 to be tested includes 4 peripheral cable cores, i.e., a1, a2, A3 and a4, and the a0 is a central cable core. The output switch includes: the number of the K11, the K12, the K13 and the K14 is 4, wherein the K11 corresponds to A1, the K12 corresponds to A2, the K13 corresponds to A3 and the K14 corresponds to A4. Likewise, the input switch includes: 4 of K21, K22, K23 and K24, wherein K21 corresponds to K11 and A1, K22 corresponds to K12 and A2, K23 corresponds to K13 and A3, and K24 corresponds to K14 and A4.
As shown in fig. 1, input switches K21, K22, K23, and K24 may be sequentially triggered to close by control unit 16 according to a set sequence, and simultaneously corresponding incident signals may be sequentially output to peripheral cable core a1, peripheral cable core a2, peripheral cable core A3, and peripheral cable core a4 by signal design unit 12, output switches K11, K12, K13, and K14 are sequentially closed, and signal acquisition unit 13 may sequentially acquire incident signals and reflected signals to peripheral cable cores a1, a2, A3, and a4, thereby implementing defect detection on peripheral cable cores a1, a2, A3, and a 4. It should be noted that, when defect detection is performed on any one of the peripheral cable cores, the currently detected peripheral cable core is the cable core to be detected according to the embodiment of the present invention.
Specifically, when defect detection is not performed, all switches are in an off state, and when any peripheral cable core is detected, only the input switch and the output switch corresponding to the peripheral cable core are closed, and the switches are in the off state. And after the detection is finished, disconnecting the switch of the currently measured peripheral cable core, and closing the switch of the next peripheral cable core, and so on. The closed input switch and the closed output switch are kept synchronous, so that the central cable core and the cable core to be detected are kept in series connection in the detection process.
For example, as shown in fig. 1, when detection is performed sequentially according to the sequence of a1, a2, A3, and a4, the input switch K21 and the output switch K11 are controlled to be synchronously closed, the remaining switches are kept to be open, so that the a1 is connected in series with the a0, then the control signal design module inputs an incident signal, the incident signal is transmitted by the a1 and the a0 which are connected in series and then returns to the signal acquisition unit 13, and the signal acquisition unit 13 acquires the incident signal of the a1 and then acquires a reflected signal. The control unit 16 initiates defect detection of a2 after a preset time period, i.e. controls K21 and K11 to open and controls K22 and K12 to close. And the detection of A3 and A4 is completed by analogy.
Optionally, in the embodiment of the present invention, the preset time period may be set according to an actual test requirement, and the present invention is not particularly limited.
The signal design unit 12 is configured to design a reference signal according to the property of the multi-core cable 10 to be tested and output an incident signal based on the reference signal.
Optionally, in the embodiment of the present invention, the attributes of the multi-core cable 10 to be tested include, but are not limited to: length, material, attenuation characteristics of the cable, etc.
Specifically, in the embodiment of the present invention, the signal designing unit 12 performs design of the relevant parameters of the reference signal according to the length, material, attenuation characteristics, and the like of the cable, so as to form the corresponding incident signal. It is understood that the incident signal is different for different multi-core cables.
Optionally, in an embodiment of the present invention, the incident signal is a chirp signal having a gaussian envelope. By adopting the linear frequency modulation signal with the Gaussian envelope, the input incident signal has certain interference resistance and good time domain analyzability. For example, a signal having a frequency center of 400MHz, a bandwidth of 100MHz of the multi-core cable to be tested, a duration of 20ns, and a time center of 100ns of the multi-core cable to be tested is shown in fig. 3.
The cable core processing unit 11 is configured to control connection between a central cable core of the multi-core cable 10 to be tested and the cable core to be tested, so as to enhance a reflection signal of the cable core to be tested.
The signal acquisition unit 13 is configured to acquire the incident signal output by the signal design unit 12 and the reflected signal generated by the cable core to be tested, and convert the acquired incident signal and reflected signal into data signals, respectively.
Optionally, in the embodiment of the present invention, the signal acquisition unit 13 may be an oscilloscope. Therefore, in the embodiment of the present invention, the signal sent by the signal acquisition unit 13 to the data processing unit 14 is a digital waveform.
The data processing unit 14 is used for processing the data signal.
Optionally, in the embodiment of the present invention, after receiving each group of data signals (including the incident data signal and the reflected data signal) sent by the signal acquisition unit 13, the data processing unit 14 performs time domain analysis on each group of incident data signals and reflected data signals, respectively, to determine whether there is a reflected peak caused by a defect, and further obtain a position of the defect according to the peak time difference.
Specifically, the positions of the incident data signal and the reflected data signal on the time axis, which are sent to the data processing unit 14 by the signal acquisition module, are taken as the reference, the distance between the peak values on the time axis is the time difference, which is also called the peak time difference, and then the position of the defect can be calculated by using the wave velocity.
The defect location unit 15 is used for performing defect location according to the data processed by the data processing unit 14.
In the embodiment of the present invention, the defect positioning unit 15 can determine which cable core in the multi-core cable 10 to be tested has a defect and determine the defect position of the cable core according to the data and the related information (the cable core number, the input switch number, the output switch number, etc.) sent by the data processing unit 14, thereby implementing the cable core defect positioning.
Specifically, the control unit 16 controls the cable core processing unit 11 to connect the central cable core and the peripheral cable core in series according to a set sequence, so as to amplify the amplitude of the signal transmitted in the cable core. The signal design unit 12 designs a signal and inputs an incident signal, when the peripheral cable core has a defect, a reflected signal is generated and is collected by the signal collection unit 13, and the collected signal is processed by the data processing unit 14 after being converted into digital data. By calculating the peak time difference, the reflection position of the reflected signal on the cable, i.e. the distance where the defect exists, can be obtained. The defect locating unit 15 stores a reference threshold, and when the amplitude of the reflected signal is greater than the reference threshold, it is determined that a defect exists at the position. According to the number of the cable cores connected with the cable core processing unit 11 during the detection, the cable cores with defects and the distance between the defects and the detection end (namely, defect positioning) can be determined.
Referring to fig. 2, a schematic flow chart of an alternative embodiment of the method for enhancing a defect signal of an instrument-controlled multi-core cable of a nuclear power plant according to the present invention is shown. The method for enhancing the defect signal of the instrument control multi-core cable of the nuclear power station can be realized by the defect signal enhancement system of the instrument control multi-core cable of the nuclear power station disclosed by the embodiment of the invention.
As shown in fig. 2, the method for enhancing the defect signal of the instrument control multi-core cable of the nuclear power plant includes:
step S201, determining a cable core to be tested.
And S202, controlling the on-off of the cable core processing unit 11 so as to enable the cable core to be tested to be connected with the central cable core in series.
Step S203, the control signal designing unit 12 outputs the incident signal.
Step S204, the signal acquisition unit 13 acquires the incident signal and the reflected signal of the cable core to be tested, and the signal acquisition unit 13 converts the acquired incident signal and reflected signal into data signals respectively.
Step S205, the data processing unit 14 receives the data signal and processes it.
In step S206, the defect locating unit 15 locates defects according to the signals processed by the data processing unit 14.
In the embodiment of the invention, the cable connecting line with proper length can be replaced according to the actual environment on site, the length of the cable connecting line is not suitable for unlimited length, the transmission of electromagnetic signals in a limited path is required to be ensured, and a detection blind area caused by signal attenuation is avoided.
The invention can cause micro defects due to various factors for the multi-core instrument control cable which runs in a nuclear power station for a long time, the reflection peak caused by the micro defects can be difficult to identify when the multi-core instrument control cable is measured independently, and the reflection peak amplitude of the peripheral cable core is improved by utilizing the high-amplitude signal strength of the central cable core through the series connection of the central cable core and the peripheral cable core, so that the micro defects can be identified more easily, and the positioning precision of the cable defects is improved. The tiny defects are found in advance and are processed, so that the defects of the cable can be prevented from being degraded to cause faults.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A nuclear power station instrument control multicore cable's defect signal enhancement system which characterized in that includes: the system comprises a signal design unit, a cable core processing unit, a signal acquisition unit, a data processing unit and a defect positioning unit;
the cable core processing unit is respectively connected with the signal design unit, the signal acquisition unit and the multi-core cable to be detected, and the data processing unit is respectively connected with the signal acquisition unit and the defect positioning unit;
the signal design unit is used for designing a reference signal according to the attribute of the multi-core cable to be tested and outputting an incident signal based on the reference signal;
the cable core processing unit is used for controlling the connection between the central cable core of the multi-core cable to be tested and the cable core to be tested so as to enhance the reflection signal of the cable core to be tested;
the signal acquisition unit is used for acquiring the incident signal output by the signal design unit and the reflected signal generated by the cable core to be tested, and respectively converting the acquired incident signal and the acquired reflected signal into data signals;
the data processing unit is used for processing the data signal;
and the defect positioning unit is used for positioning defects according to the data processed by the data processing unit.
2. The system for enhancing defect signals of the instrument-controlled multi-core cable of the nuclear power plant as recited in claim 1, wherein the cable core processing unit comprises: a cable core measuring module;
the cable core measuring module is respectively connected with the signal design unit, the signal acquisition unit and the head end of the peripheral cable core of the multi-core cable to be measured; the peripheral cable cores are all cable cores except the central cable core in the multi-core cable to be tested;
the cable core measuring module is used for completing the connection or disconnection of the head end of the peripheral cable core with the signal design unit and the signal acquisition module.
3. The system for enhancing the defect signals of the instrument-controlled multi-core cable of the nuclear power plant as claimed in claim 2, wherein the cable core measuring module comprises: a plurality of output switches;
and the first end of each output switch is connected with the input end of the signal acquisition unit and the output end of the signal design unit, and the second end of each output switch is connected with the head end of the corresponding peripheral cable core.
4. The system for enhancing the defect signals of the instrument-controlled multi-core cable of the nuclear power plant as claimed in claim 3, wherein each output switch is in a normally open state, and when defect location is performed, the output switch corresponding to the cable core to be tested is closed, and the other output switches are kept in the normally open state.
5. The system for enhancing defect signals in an instrument-controlled multi-core cable for a nuclear power plant of claim 3, wherein the cable core processing unit further comprises: the cable core is connected with the module;
the cable core connecting module is connected with the tail end of the peripheral cable core and the central cable core and used for realizing connection or disconnection of the cable core to be tested.
6. The system for enhancing defect signals of the instrument-controlled multi-core cable of the nuclear power plant as claimed in claim 5, wherein the cable core connection module comprises: a plurality of input switches and a common connector;
each input switch's first end respectively rather than the end connection of the peripheral cable core that corresponds, each input switch's second end all with the second end of public connector is connected, the first end of public connector with the end connection of central cable core.
7. The system for enhancing the defect signals of the instrument-controlled multi-core cable of the nuclear power plant as recited in claim 6, wherein each of the input switches is normally open, and when defect localization is performed, the input switch corresponding to the cable core to be tested is closed, and the other input switches are normally open.
8. The system for enhancing defect signals of the instrument-controlled multi-core cable of the nuclear power plant as claimed in claim 6, wherein when defect localization is performed, the closed output switch of the cable core measuring module corresponds to the closed input switch of the cable core connecting module.
9. The system for enhancing the defect signals of the instrument-controlled multi-core cable of the nuclear power plant as recited in claim 2, further comprising: the control unit is respectively connected with the cable core measuring module and the cable core connecting module;
the control unit is used for controlling the on/off states of an output switch in the cable core measuring module and an input switch in the cable core connecting module.
10. A method for enhancing a defect signal of an instrument control multi-core cable of a nuclear power station is characterized by comprising the following steps:
determining a cable core to be tested;
controlling the on-off of the cable core processing unit so as to connect the cable core to be tested with the central cable core in series;
controlling the signal design unit to output an incident signal;
acquiring the incident signal and the reflected signal of the cable core to be detected through a signal acquisition unit, and respectively converting the acquired incident signal and the acquired reflected signal into data signals through the signal acquisition unit;
the data processing unit receives and processes the data signal;
and the defect positioning unit is used for positioning the defects according to the signals processed by the data processing unit.
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