A defect signal enhancement system and method for an instrument control multi-core cable in a nuclear power plant

Abstract

The present invention relates to a defect signal enhancement system and method for a nuclear power plant instrument control multi-core cable, comprising: a signal design unit, a cable core processing unit, a signal acquisition unit, a data processing unit, and a defect location 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 measured and the cable core to be measured, so as to enhance the reflected signal of the cable core to be measured; 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 measured, and respectively converts the acquired incident signal and reflected signal into data signals; the data processing unit processes the data signals; the defect location unit performs defect location according to the data processed by the data processing unit. The present invention can effectively enhance the reflected signal of the defective cable core, thereby greatly improving the accuracy of defect location.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and more specifically, to a defect signal enhancement system and method for an instrument control multi-core cable in a nuclear power plant. Background Art

[0002] At present, there is still a lack of corresponding specifications for the safe and reliable insulation degradation state assessment of instrument control cables in nuclear power plants. To ensure the safe and stable operation of nuclear power plants, it is necessary to regularly diagnose the defects of instrument control cables in nuclear power plants, timely discover potential cable defect hidden dangers, and handle them in time to avoid accidents.

[0003] The possible defect types of instrument control cables are roughly as follows: extrusion, poor connection, aging, outer skin damage, etc. Among them, extrusion may be the extrusion between cable groups or the local extrusion and bending of the cable due to external environmental pressure; poor connection may be formed due to the overall misalignment and rotation of the cable; aging is caused by the long-term load operation of the cable and heat influence. These typical defects will cause changes in the electrical or physical properties of the cable, resulting in abnormal impedance, and causing signals to be reflected and refracted at the impedance abnormal point. Therefore, the cable defect can be located by the traveling wave detection method.

[0004] However, the signal will attenuate during the cable transmission process, and the impedance abnormality caused by relatively small defects is also relatively small, resulting in the difficulty of detecting the peak of the reflected signal, and reducing the accuracy of defect location. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a defect signal enhancement system and method for an instrument control multi-core cable in a nuclear power plant in view of the defects of the prior art.

[0006] The technical solution adopted by the present invention to solve its technical problems is to construct a defect signal enhancement system for an instrument control multi-core cable in a nuclear power plant, including: a signal design unit, a cable core processing unit, a signal acquisition unit, a data processing unit, and a defect location unit;

[0007] The cable core processing unit is respectively connected to the signal design unit, the signal acquisition unit, and the multi-core cable to be measured, and the data processing unit is respectively connected to the signal acquisition unit and the defect location unit;

[0008] The signal design unit is used to design a reference signal according to the attributes of the multi-core cable to be measured and output an incident signal based on the reference signal;

[0009] The cable core processing unit is used to control the connection between the central cable core of the multi-core cable to be measured and the cable core to be measured to enhance the reflected signal of the cable core to be measured;

[0010] The signal acquisition unit is used to acquire the incident signal output by the signal design unit and the reflection signal generated by the cable core to be measured, and convert the acquired incident signal and reflection signal into data signals respectively;

[0011] The data processing unit is used to process the data signals;

[0012] The defect location unit is used to locate defects according to the data processed by the data processing unit.

[0013] In the defect signal enhancement system for the nuclear power plant I&C multi-core cable of the present invention, the cable core processing unit includes: a cable core measurement module;

[0014] The cable core measurement module is respectively connected to the signal design unit, the signal acquisition unit and the head end of the peripheral cable cores 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 measured;

[0015] The cable core measurement module is used to complete the connection or disconnection between the head end of the peripheral cable cores and the signal design unit and the signal acquisition module.

[0016] In the defect signal enhancement system for the nuclear power plant I&C multi-core cable of the present invention, the cable core measurement module includes: a plurality of output switches;

[0017] The first end of each output switch is connected to 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 respectively connected to the head end of the corresponding peripheral cable core.

[0018] In the defect signal enhancement system for the nuclear power plant I&C multi-core cable of the present invention, each output switch is in an open state, and when defect location is performed, the output switch corresponding to the cable core to be measured is closed, and the remaining output switches remain in an open state.

[0019] In the defect signal enhancement system for the nuclear power plant I&C multi-core cable of the present invention, the cable core processing unit further includes: a cable core connection module;

[0020] The cable core connection module is connected to the end of the peripheral cable core and the central cable core, and is used to realize the connection or disconnection of the cable core to be measured.

[0021] In the defect signal enhancement system for the nuclear power plant I&C multi-core cable of the present invention, the cable core connection module includes: a plurality of input switches and a common connection head;

[0022] The first end of each of the input switches is respectively connected to the end of its corresponding peripheral cable core, the second end of each of the input switches is connected to the second end of the common connector, and the first end of the common connector is connected to the end of the central cable core.

[0023] In the defect signal enhancement system of the nuclear power plant instrument control multi-core cable according to the present invention, each of the input switches is in an open state, and when defect location is performed, the input switch corresponding to the cable core to be measured is closed, and the remaining input switches remain in the open state.

[0024] In the defect signal enhancement system of the nuclear power plant instrument control multi-core cable according to the present invention, when defect location is performed, the closed output switch in the cable core measurement module corresponds to the closed input switch in the cable core connection module.

[0025] In the defect signal enhancement system of the nuclear power plant instrument control multi-core cable according to the present invention, it further includes: a control unit respectively connected to the cable core measurement module and the cable core connection module;

[0026] The control unit is used to control the on / off states of the output switch in the cable core measurement module and the input switch in the cable core connection module.

[0027] The present invention also provides a method for enhancing defect signals of a nuclear power plant instrument control multi-core cable, including:

[0028] Determine the cable core to be measured;

[0029] Control the on / off of the cable core processing unit so that the cable core to be measured is connected in series with the central cable core;

[0030] Control the signal design unit to output an incident signal;

[0031] Collect the incident signal and the reflected signal of the cable core to be measured through the signal acquisition unit, and the signal acquisition unit respectively converts the collected incident signal and reflected signal into data signals;

[0032] The data processing unit receives the data signals and processes them;

[0033] The defect location unit performs defect location according to the signals processed by the data processing unit.

[0034] The defect signal enhancement system and method for the nuclear power plant instrument control multi-core cable implementing the present invention have the following beneficial effects: including: a signal design unit, a cable core processing unit, a signal acquisition unit, a data processing unit, and a defect location unit; the signal design unit outputs an incident signal; the cable core processing unit controls the connection between the central cable core and the cable cores to be measured of the multi-core cable to be measured, so as to enhance the reflection signal of the cable cores to be measured; the signal acquisition unit acquires the incident signal output by the signal design unit and the reflection signal generated by the cable cores to be measured, and converts the acquired incident signal and reflection signal into data signals respectively; the data processing unit processes the data signals; the defect location unit performs defect location according to the data processed by the data processing unit. The present invention can effectively enhance the reflection signal of the defective cable core, thereby greatly improving the accuracy of defect location. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0036] Figure 1 is a schematic structural diagram of the defect signal enhancement system for the nuclear power plant instrument control multi-core cable provided by an embodiment of the present invention;

[0037] Figure 2 is a schematic flow diagram of the defect signal enhancement method for the nuclear power plant instrument control multi-core cable provided by an embodiment of the present invention;

[0038] Figure 3 is a schematic diagram of the incident signal provided by an embodiment of the present invention;

[0039] Figure 4 is a schematic diagram of the reflection signal of the peripheral cable cores provided by an embodiment of the present invention;

[0040] Figure 5 is a schematic diagram of the reflection signal of the central cable core provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the drawings.

[0042] In order to increase the peak value at the defect in the reflection signal for defect detection of the multi-core instrument control cable of the nuclear power plant, the present invention provides a defect signal enhancement system and method for the nuclear power plant instrument control multi-core cable. The defect signal enhancement system and method for the nuclear power plant instrument control multi-core cable utilize the magnetic field correlation effect between multiple cable cores. For the case where multiple outer rotating cable cores surround a central cable core, it can effectively enhance the reflection signal of each cable core, thereby improving the accuracy of defect location.

[0043] Specifically, as Figure 1As shown in the figure, the defect signal enhancement system for the instrument control multi-core cable of the nuclear power plant includes: a signal design unit 12, a cable core processing unit 11, a signal acquisition unit 13, a data processing unit 14, and a defect location unit 15.

[0044] The cable core processing unit 11 is respectively connected to the signal design unit 12, the signal acquisition unit 13, and the multi-core cable 10 to be tested. The data processing unit 14 is respectively connected to the signal acquisition unit 13 and the defect location unit 15.

[0045] Optionally, in the embodiment of the present invention, as Figure 1 shown, the cable core processing unit 11 includes: a cable core measurement module 111.

[0046] Among them, the cable core measurement module 111 is respectively connected to the signal design unit 12, the signal acquisition unit 13, and the first ends of the peripheral cable cores of the multi-core cable 10 to be tested. The peripheral cable cores are all the cable cores of the multi-core cable 10 to be tested except the central cable core. Among them, the signal comparison between the central cable core and the turnover cable core is as Figure 4 and Figure 5 shown.

[0047] In the embodiment of the present invention, the cable core measurement module 111 is used to complete the connection or disconnection between the first end of the peripheral cable core and the signal design unit 12 and the signal acquisition module.

[0048] Optionally, in the embodiment of the present invention, the cable core measurement module 111 includes: a plurality of output switches.

[0049] The first end of each output switch is connected to 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 respectively connected to the first end of the corresponding peripheral cable core.

[0050] Among them, 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 remaining output switches remain in the normally open state.

[0051] Furthermore, as Figure 1 shown, the cable core processing unit 11 further includes: a cable core connection module 112.

[0052] The cable core connection module 112 is connected to the ends of the peripheral cable cores and the central cable core, and is used to realize the connection or disconnection of the cable core to be tested.

[0053] Optionally, in the embodiment of the present invention, the cable core connection module 112 includes: a plurality of input switches and a common connection head P.

[0054] The first end of each input switch is respectively connected to the end of its corresponding peripheral cable core, the second end of each input switch is connected to the second end of the common connector P, and the first end of the common connector P is connected to the end of the central cable core.

[0055] Wherein, each input switch is in an open state, and when defect location is performed, the input switch corresponding to the cable core to be measured is closed, and the remaining input switches remain in the open state.

[0056] 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.

[0057] Further, in the embodiment of the present invention, the defect signal enhancement system of the nuclear power plant instrument control multi-core cable further includes: a control unit 16 respectively connected to the cable core measurement module 111 and the cable core connection module 112.

[0058] The control unit 16 is used to control the on / off states of the output switches in the cable core measurement module 111 and the input switches in the cable core connection module 112.

[0059] Specifically, as Figure 1 shown, the control unit 16 is respectively 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 realize the control of the on / off states of each output switch and input switch.

[0060] In the embodiment of the present invention, through the cable core processing module, using multiple peripheral cable cores to surround the central cable core for electromagnetic field enhancement, it can be made that under the same conditions, when time-domain reflection is performed with the same incident signal, the signal intensity of the central cable core is significantly enhanced compared with the signal intensity of the peripheral cable cores. At this time, the reflection signal of the central cable core can be enhanced, and then by connecting in series one of the central cable core and the peripheral cable cores (i.e., the cable core to be measured), the signal intensity of the cable core to be measured can be significantly improved compared with the case of detecting the cable core alone, that is, driving the signal intensity of the peripheral cable core by the signal intensity of the central cable core to achieve an increase in the peak value of the reflection wave of the defect.

[0061] It should be noted that the incident signal needs to be input from the head end of the cable core to be measured to avoid an increase in signal attenuation due to an increase in distance.

[0062] In the embodiment of the present invention, when the peripheral cable core is connected in series with the central cable core, the peripheral cable core and the central cable core are impedance-matched, so as to avoid generating a reflection peak at the series connection and affecting the accuracy of defect detection, and further improve the accuracy of defect location.

[0063] In the embodiment of the present invention, each output switch in the cable core measurement module 111 is marked with a number. Similarly, the peripheral cable cores connected thereto correspondingly are also pre-numbered to realize the association and one-to-one correspondence between the output switch and the peripheral cable core connected thereto correspondingly. Similarly, each input switch provided at the end of the cable core of the cable to be measured 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 measured.

[0064] Optionally, in the embodiment of the present invention, both the output switch and the input switch can adopt electronic switches.

[0065] Specifically, as Figure 1 shown, the multi-core cable 10 to be measured includes 4 peripheral cable cores A1, A2, A3, and A4, and A0 is the central cable core. The output switches include: 4 switches K11, K12, K13, and K14. Among them, K11 corresponds to A1, K12 corresponds to A2, K13 corresponds to A3, and K14 corresponds to A4. Similarly, the input switches include: 4 switches K21, K22, K23, and K24. Among them, K21 corresponds to K11 and corresponds to A1 at the same time, K22 corresponds to K12 and corresponds to A2 at the same time, K23 corresponds to K13 and corresponds to A3 at the same time, and K24 corresponds to K14 and corresponds to A4 at the same time.

[0066] As Figure 1 shown, the control unit 16 can sequentially trigger the input switches K21, K22, K23, and K24 to close according to a set order, and at the same time sequentially output corresponding incident signals to the peripheral cable cores A1, A2, A3, and A4 through the signal design unit 12. The output switches K11, K12, K13, and K14 are closed in sequence, and the signal acquisition unit 13 can sequentially collect the incident signals and reflection signals of the peripheral cable cores A1, A2, A3, and A4, so as to realize the defect detection of the peripheral cable cores A1, A2, A3, and A4. 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 measured referred to in the embodiment of the present invention.

[0067] Specifically, when no defect detection is performed, all switches are in the off state. When defect detection is performed on any one of the peripheral cable cores, only the input switch and the output switch corresponding to the peripheral cable core are closed, and the other switches are in the off state. After the detection is completed, the switches connecting the currently measured peripheral cable core are disconnected, and the switches connecting the next peripheral cable core are closed, and so on. Among them, the closed input switch and the output switch are kept synchronized to ensure that the central cable core and the cable core to be measured are in series during the detection process.

[0068] For example, as Figure 1As shown, when detecting in the order of A1, A2, A3, and A4, first control the input switch K21 and the output switch K11 to close synchronously, and keep the other switches open, so that A1 and A0 are in series. Then control the signal design module to input the incident signal. The incident signal is transmitted through the series-connected A1 and A0 and then returns to the signal acquisition unit 13. After the signal acquisition unit 13 first acquires the incident signal of A1, it then acquires the reflected signal. After a preset time period, the control unit 16 starts the defect detection of A2, that is, controls K21 and K11 to disconnect, and controls K22 and K12 to close. And so on, the detections of A3 and A4 are completed.

[0069] Optionally, in the embodiments of the present invention, the preset time period can be set according to actual test requirements, and the present invention does not make specific limitations.

[0070] The signal design unit 12 is used to design a reference signal according to the attributes of the multi-core cable 10 to be measured and output an incident signal based on the reference signal.

[0071] Optionally, in the embodiments of the present invention, the attributes of the multi-core cable 10 to be measured include but are not limited to: the length, material, attenuation characteristics, etc. of the cable.

[0072] Specifically, in the embodiments of the present invention, the signal design unit 12 designs relevant parameters of the reference signal according to the length, material, attenuation characteristics, etc. of the cable to form a corresponding incident signal. It can be understood that for different multi-core cables, their incident signals are different.

[0073] Optionally, in the embodiments of the present invention, the incident signal is a linear frequency modulation signal with a Gaussian envelope. By using a linear frequency modulation signal with a Gaussian envelope, the input incident signal can have certain anti-interference ability and good time-domain analyzability. For example, a signal with a frequency center of 400 MHz, a frequency bandwidth of 100 MHz for the multi-core cable to be measured, a duration of 20 ns, and a time center of 100 ns for the multi-core cable to be measured is as Figure 3 shown.

[0074] The cable core processing unit 11 is used to control the connection between the central cable core of the multi-core cable 10 to be measured and the cable core to be measured to enhance the reflected signal of the cable core to be measured.

[0075] The signal acquisition unit 13 is used to acquire the incident signal output by the signal design unit 12 and the reflected signal generated by the cable core to be measured, and convert the acquired incident signal and reflected signal into data signals respectively.

[0076] Optionally, in the embodiments of the present invention, the signal acquisition unit 13 can be an oscilloscope. Therefore, in the embodiments of the present invention, the signal sent by the signal acquisition unit 13 to the data processing unit 14 is a digital waveform.

[0077] The data processing unit 14 is used to process data signals.

[0078] Optionally, in the embodiments of the present invention, after the data processing unit 14 receives each group of data signals (including incident data signals and reflected data signals) sent by the signal acquisition unit 13, it performs time-domain analysis on each group of incident data signals and reflected data signals respectively to determine whether there is a reflected wave peak caused by a defect, and then obtains the position of the defect according to the peak time difference.

[0079] Specifically, for the positions of the incident data signal and the reflected data signal sent by the signal acquisition module on the time axis to the data processing unit 14, the peak values of the two in terms of signal amplitude are taken as the reference, and the distance between the two peaks on the time axis is the time difference, also known as the peak time difference. Then, the position of the defect can be calculated using the wave velocity.

[0080] The defect location unit 15 is used to locate the defect according to the data processed by the data processing unit 14.

[0081] In the embodiments of the present invention, the defect location unit 15 can determine which core of the multi-core cable 10 to be tested has a defect and determine the defect position of the core according to the data and relevant information (such as core number, input switch number, output switch number, etc.) sent by the data processing unit 14, so as to realize the location of the core defect.

[0082] Specifically, the control unit 16 controls the core processing unit 11 to connect the central core and the peripheral cores in series in a set order to amplify the signal amplitude transmitted in the core. The signal design unit 12 designs the signal and inputs the incident signal. When there is a defect in the peripheral core, a reflected signal will be generated, which is collected by the signal acquisition unit 13. After the collected signal is converted into digital data, it is processed by the data processing unit 14. By calculating the peak time difference, the reflection position of the reflected signal on the cable, that is, the distance where the defect exists, can be obtained. A reference threshold is stored in the defect location unit 15. When the amplitude of the reflected signal is greater than the reference threshold, it is determined that there is a defect at that place. According to the core number connected by the core processing unit 11 during this detection, the core with the defect and the distance of the defect from the detection end (i.e., defect location) can be determined.

[0083] Reference Figure 2 , which is a schematic flowchart of an optional embodiment of the defect signal enhancement method for the nuclear power plant I&C multi-core cable provided by the present invention. The defect signal enhancement method for the nuclear power plant I&C multi-core cable can be implemented by the defect signal enhancement system for the nuclear power plant I&C multi-core cable disclosed in the embodiments of the present invention.

[0084] As Figure 2 shown, the defect signal enhancement method for the nuclear power plant I&C multi-core cable includes:

[0085] Step S201: Determine the cable core to be measured.

[0086] Step S202: Control the on / off of the cable core processing unit 11 to connect the cable core to be measured in series with the central cable core.

[0087] Step S203: Control the signal design unit 12 to output an incident signal.

[0088] Step S204: Collect the incident signal and the reflected signal of the cable core to be measured through the signal acquisition unit 13, and the signal acquisition unit 13 converts the collected incident signal and reflected signal into data signals respectively.

[0089] Step S205: The data processing unit 14 receives and processes the data signals.

[0090] Step S206: The defect location unit 15 locates the defect according to the signal processed by the data processing unit 14.

[0091] In the embodiment of the present invention, the cable connecting line with an appropriate length can be replaced according to the actual on-site environment, and its length should not be infinitely long. It is necessary to ensure the transmission of electromagnetic signals within a limited path to avoid the detection blind area caused by signal attenuation.

[0092] For the multi-core instrument control cable that has been running in the nuclear power plant for a long time in the present invention, there may be minute defects due to various factors. When measuring alone, the reflection peaks caused by the minute defects may be difficult to identify. By connecting the central cable core in series with the surrounding cable cores and using the high-amplitude signal intensity of the central cable core to increase the amplitude of the reflection peaks of the surrounding cable cores, the minute defects can be more easily identified, and the accuracy of cable defect location can be improved. Discovering and dealing with minute defects in advance can avoid the deterioration of cable defects leading to failures.

[0093] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0094] Those skilled in the art may further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0095] The steps of the methods or algorithms described in combination with the embodiments disclosed herein can be directly implemented by hardware, software modules executed by a processor, or a combination of both. The software modules can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium well known in the art.

[0096] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A defect signal enhancement system for the instrument control multi-core cable of a nuclear power plant, characterized in that Comprising: A signal design unit, a cable core processing unit, a signal acquisition unit, a data processing unit, and a defect location unit; The cable core processing unit is respectively connected to the signal design unit, the signal acquisition unit, and the multi-core cable to be measured, and the data processing unit is respectively connected to the signal acquisition unit and the defect location unit; The signal design unit is used to design a reference signal according to the attributes of the multi-core cable to be measured and output an incident signal based on the reference signal; the incident signal is a linear frequency modulation signal with a Gaussian envelope; The cable core processing unit is used to control the connection between the central cable core of the multi-core cable to be measured and the cable core to be measured to enhance the reflection signal of the cable core to be measured; The cable core processing unit includes: a cable core measurement module; the cable core measurement module is respectively connected to the signal design unit, the signal acquisition unit, and the head end of the peripheral cable cores of the multi-core cable to be measured; the peripheral cable cores are all cable cores of the multi-core cable to be measured except the central cable core; the cable core measurement module is also used to complete the connection or disconnection between the head end of the peripheral cable cores and the signal design unit and the signal acquisition module; the incident signal is input from the head end of the cable core to be measured; when the peripheral cable cores are connected to the central cable core, the peripheral cable cores are impedance-matched with the central cable core; The signal acquisition unit is used to acquire the incident signal output by the signal design unit and the reflection signal generated by the cable core to be measured, and respectively convert the acquired incident signal and reflection signal into data signals; The data processing unit is used to process the data signals; The defect location unit is used to perform defect location according to the data processed by the data processing unit.

2. The defect signal enhancement system for the nuclear power plant instrument control multi-core cable according to claim 1, wherein The cable core measurement module includes: a plurality of output switches; The first end of each output switch is connected to 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 respectively connected to the head end of the corresponding peripheral cable core.

3. The defect signal enhancement system for the nuclear power plant I&C multi-core cable according to claim 2, characterized in that, Each output switch is in an open state, and when defect location is performed, the output switch corresponding to the cable core to be measured is closed, and the remaining output switches remain in an open state.

4. The defect signal enhancement system for the nuclear power plant I&C multi-core cable according to claim 2, characterized in that, The cable core processing unit further includes: a cable core connection module; The cable core connection module is connected to the end of the peripheral cable core and the central cable core, and is used to realize the connection or disconnection of the cable core to be measured.

5. The defect signal enhancement system for the nuclear power plant I&C multi-core cable according to claim 4, wherein The cable core connection module includes: a plurality of input switches and a common connection head; The first end of each input switch is respectively connected to the end of the corresponding peripheral cable core, the second end of each input switch is connected to the second end of the common connection head, and the first end of the common connection head is connected to the end of the central cable core.

6. The defect signal enhancement system of the nuclear power plant I&C multi-core cable according to claim 5, characterized in that, Each input switch is in an open state, and when defect location is performed, the input switch corresponding to the cable core to be measured is closed, and the remaining input switches remain in an open state.

7. The defect signal enhancement system for the nuclear power plant I&C multi-core cable according to claim 5, characterized in that, When defect location is performed, the closed output switch in the cable core measurement module corresponds to the closed input switch in the cable core connection module.

8. The defect signal enhancement system for the nuclear power plant I&C multi-core cable according to claim 1, wherein, It further includes: A control unit respectively connected to the cable core measurement module and the cable core connection module; The control unit is used to control the on / off states of the output switch in the core measurement module and the input switch in the core connection module.

9. A method for enhancing defect signals of an instrument control multi-core cable in a nuclear power plant, characterized in that, Comprising: Determine the core to be measured; Control the on / off of the core processing unit to connect the core to be measured in series with the central core; the incident signal is input from the head end of the core to be measured; when the peripheral core is connected to the central core, the peripheral core is impedance-matched with the central core; the peripheral core is all cores in the multi-core cable to be measured except the central core; Control the signal design unit to output an incident signal; the incident signal is a linear frequency-modulated signal with a Gaussian envelope; Collect the incident signal and the reflected signal of the core to be measured through the signal acquisition unit, and the signal acquisition unit converts the collected incident signal and reflected signal into data signals respectively; The data processing unit receives and processes the data signals; The defect location unit locates the defect according to the signal processed by the data processing unit.

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