Method and apparatus for on-line cable continuity check in nuclear power plant

Abstract

The application discloses a kind of nuclear power plant online cable continuity inspection method and device, its method includes: S10, the transmission signal characteristic of the cable to be measured is obtained;S20, according to the transmission signal characteristic determines the waveform parameter adjustable range of specific signal wave;S30, according to the waveform parameter adjustable range setting the waveform parameter of specific signal wave;S40, after controlling the specific signal wave input to one end of the cable to be measured, the return signal wave output at the other end of the cable to be measured is obtained;S50, according to the specific signal wave and return signal wave assesses the continuity of the cable to be measured.The application can check the continuity of the cable to be measured without disassembling wire, without affecting the normal operation of nuclear power plant, can reduce the risk of human error and human resource consumption in the process of inspection, improve cable continuity inspection efficiency.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant equipment maintenance and commissioning technology, and in particular to a method and apparatus for checking the continuity of online cables in nuclear power plants. Background Technology

[0002] In nuclear power plants, cables are important components for transmitting various control signals. If there are continuous faults in the cables, such as open circuits, loose connections, or incorrect connections, it may cause the relevant equipment to malfunction and have a significant impact on the nuclear power plant. Therefore, it is necessary to conduct continuity checks on the cables regularly to ensure their continuity.

[0003] Currently, continuity checks are typically performed by measuring the continuity at both ends of the cable and its impedance to ground using a multimeter. To avoid interfering with the control commands transmitted through the cable and ultimately affecting equipment operation, the cable must be disconnected before the inspection can proceed. However, disconnection breaks the cable's signal circuit, already impacting equipment operation. Disconnection can be divided into live disconnection and de-energized disconnection. De-energized disconnection requires shutting down some equipment, which also affects normal operation. In some centralized control systems, power outages can have a wide impact, making the inspection very difficult and often hindering progress. Live disconnection also requires analyzing the impact of the broken signal circuit on normal equipment operation and necessitates implementing control measures before proceeding. When there are many cables, this analysis is time-consuming and labor-intensive, making it equally difficult to proceed. Furthermore, after the continuity check is passed, the wiring must be restored. Disconnecting and restoring the wiring is not only labor-intensive, but also increases the risk of human error, which can easily cause damage to the terminal blocks, loose connections, or incorrect connections. This may cause signal malfunctions (such as false triggering, abnormal jitter, and jumps), which in severe cases can lead to equipment damage or even affect the operation of the nuclear power plant.

[0004] For some long cables with large spans at both ends, at least two inspectors are needed to conduct continuous inspections of the cables using communication equipment. This results in drawbacks such as high demand for human resources, inconvenient communication, and low inspection efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method and apparatus for inspecting the continuity of online cables in nuclear power plants.

[0006] The technical solution adopted by this invention to solve its technical problem is: to construct a method for inspecting the continuity of online cables in nuclear power plants, comprising the following steps:

[0007] S10. Obtain the transmission signal characteristics of the cable under test;

[0008] S20. Determine the adjustable range of waveform parameters for a specific signal wave based on the characteristics of the transmitted signal;

[0009] S30. Set the waveform parameters of the specific signal wave according to the adjustable range of the waveform parameters;

[0010] S40. After controlling the specific signal wave to be input to one end of the cable under test, obtain the return signal wave output at the other end of the cable under test;

[0011] S50. Evaluate the continuity of the cable under test based on the specific signal wave and the return signal wave.

[0012] Preferably, in S10, the transmission signal characteristics include low-level identification information and high-level identification information of the transmission signal;

[0013] S20 includes: setting the amplitude adjustable range in the adjustable range of the waveform parameters according to the low level identification information and the high level identification information.

[0014] Preferably, S20 further includes:

[0015] Set the adjustable frequency range in the adjustable waveform parameter range to a predetermined frequency range.

[0016] Preferably, the method for checking the continuity of online cables in nuclear power plants further includes:

[0017] S31. Connect the signal generation module, the reference cable, and the signal acquisition module in series at both ends of the cable under test.

[0018] S40 includes: inputting the specific signal wave to one end of the cable under test by controlling the signal generation module, and acquiring the return signal wave at the other end of the cable under test by the signal acquisition module.

[0019] Preferably, in step S31, the reference cable is a preset test cable or a cable that has passed the continuity check.

[0020] Preferably, the specific signal wave is a sine wave with a specific frequency and amplitude.

[0021] Preferably, step S10 further includes: acquiring the cable attributes of the cable under test;

[0022] The S50 includes:

[0023] S501. Determine the amplitude comparison threshold of the returned signal wave based on the cable properties and the amplitude of the specific signal wave;

[0024] S502. Determine whether the amplitude of the returned signal wave is less than the amplitude comparison threshold. If so, determine that the continuity check of the cable under test is unqualified and execute S504; otherwise, execute S503.

[0025] S503. Determine whether the frequency of the returned signal wave exceeds the frequency error range. If so, determine that the continuity check of the cable under test is unqualified and execute S504. Otherwise, determine that the continuity of the cable under test is qualified.

[0026] S504. Determine whether the number of times the cable under test is checked exceeds the set number. If so, determine that the continuity of the cable under test is unqualified. Otherwise, reset the amplitude and / or frequency of the specific signal wave according to the waveform characteristics and adjustable range of the waveform parameters of the returned signal wave, and return to S30.

[0027] Preferably, S501 includes:

[0028] The cable impedance of the cable under test is calculated based on the cable properties of the cable under test, and the amplitude comparison threshold is calculated based on the loop impedance data, the cable impedance of the cable under test, and the amplitude of a specific signal wave.

[0029] Preferably, in S504, the following is further included:

[0030] Upon receiving a waveform setting instruction, the amplitude and / or frequency of the specific signal wave are reset according to the waveform setting instruction.

[0031] The present invention also constructs an online cable continuity inspection device for nuclear power plants, including a main control module, the main control module comprising:

[0032] The first acquisition unit is used to acquire the transmission signal characteristics of the cable under test;

[0033] An adjustable range determination unit is used to determine the adjustable range of waveform parameters of a specific signal wave based on the characteristics of the transmitted signal.

[0034] The parameter setting unit is used to set the waveform parameters of the specific signal wave according to the adjustable range of the waveform parameters;

[0035] The second acquisition unit is used to acquire the return signal wave output at the other end of the cable under test after controlling the specific signal wave to be input to one end of the cable under test;

[0036] Evaluation unit 15 is used to evaluate the continuity of the cable under test based on the specific signal wave and the return signal wave.

[0037] Preferably, the nuclear power plant online cable continuity inspection device further includes a reference cable, a signal generation module for generating the specific signal, and a signal acquisition module for acquiring the return signal wave;

[0038] The signal output terminal of the signal generation module is connected to one end of the cable under test, the signal input terminal of the signal acquisition module is connected to the other end of the cable under test, and the signal output terminal of the signal acquisition module is connected to the signal input terminal of the signal generation module via the reference cable.

[0039] The parameter setting unit is connected to the control terminal of the signal generation module to control the operation of the signal generation module; the second acquisition unit is connected to the signal acquisition module to acquire the returned signal wave.

[0040] Preferably, the signal generation module includes an amplitude display unit for displaying the amplitude of the specific signal, a frequency display unit for displaying the frequency of the specific signal, an amplitude adjustment unit for adjusting the amplitude of the specific signal, and a frequency adjustment unit for adjusting the frequency of the specific signal.

[0041] This invention provides at least the following beneficial effects: It offers a method for inspecting the continuity of online cables in nuclear power plants; it acquires the transmission signal characteristics of the cable under test; then determines the adjustable range of waveform parameters for a specific signal wave based on the transmission signal characteristics; next, it sets the amplitude and frequency of the specific signal wave according to the adjustable range of waveform parameters; after the specific signal wave is input to one end of the cable under test, it acquires the return signal wave output at the other end of the cable under test; finally, it evaluates the continuity of the cable under test based on the specific signal wave and the return signal wave. This invention allows for the inspection of the continuity of cables under test without disconnecting the cables or affecting the normal operation of the nuclear power plant. It does not interfere with the transmission of control signals of the cables under test, reducing the risk of control signal malfunctions. It eliminates the cumbersome disconnection and risk analysis work, and avoids terminal block damage, loose connections, or incorrect connections that may occur due to disconnection and reconnection. This significantly reduces the risk of human error and the consumption of human resources, improves the efficiency of cable continuity inspection, and plays a positive role in maintaining the stable operation of nuclear power plants. Attached Figure Description

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0043] Figure 1 This is a flowchart illustrating a method for checking the continuity of online cables in nuclear power plants, as described in some embodiments of the present invention.

[0044] Figure 2 These are schematic diagrams of field implementation in some embodiments of the present invention;

[0045] Figure 3 This is a flowchart illustrating step S50 in some embodiments of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of the nuclear power plant online cable continuity inspection device in some embodiments of the present invention;

[0047] Figure 5 These are schematic diagrams of the main control module in some embodiments of the present invention;

[0048] Figure 6 These are schematic diagrams of the signal generation module in some embodiments of the present invention;

[0049] Figure 7 This is a schematic diagram of the signal acquisition module in some embodiments of the present invention. Detailed Implementation

[0050] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0051] It should be noted that the flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0052] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0053] See Figure 1 This is a flowchart illustrating a method for checking the continuity of online cables in nuclear power plants, as described in some embodiments of the present invention. The method includes the following steps:

[0054] S10. Obtain the transmission signal characteristics of the cable under test;

[0055] S20. Determine the adjustable range of waveform parameters for a specific signal wave based on the characteristics of the transmitted signal;

[0056] S30. Set the waveform parameters of a specific signal wave according to the adjustable range of waveform parameters;

[0057] S40. After a specific signal wave is input to one end of the cable under test, the return signal wave output at the other end of the cable under test is obtained.

[0058] S50. Evaluate the continuity of the cable under test based on the specific signal wave and the return signal wave.

[0059] In this embodiment, the characteristics of the transmitted signal of the cable under test are acquired; then, the adjustable range of the waveform parameters of a specific signal wave is determined based on the characteristics of the transmitted signal; next, the waveform parameters of the specific signal wave are set according to the adjustable range of the waveform parameters; after the specific signal wave is input to one end of the cable under test, the return signal wave output at the other end of the cable under test is acquired; finally, the continuity of the cable under test is evaluated based on the specific signal wave and the return signal wave. Implementing this embodiment allows for the inspection of the continuity of the cable under test without disconnecting the cable or affecting the normal operation of the nuclear power plant. It does not interfere with the transmission of the control signals of the cable under test, reducing the risk of control signal malfunction. It eliminates the tedious operation of disconnecting and reconnecting wires and the risk analysis work, avoiding potential damage to terminal blocks, loose connections, or incorrect connections caused by disconnecting and reconnecting wires. This significantly reduces the risk of human error and the consumption of human resources, improves the efficiency of cable continuity inspection, and plays a positive role in maintaining the stable operation of the nuclear power plant.

[0060] In a preferred embodiment, the waveform parameters of the specific signal wave include the amplitude and frequency of the specific signal wave; the specific signal wave is a sine wave with a specific frequency and amplitude.

[0061] In a preferred embodiment, the transmission signal characteristics in step S10 include low-level identification information and high-level identification information of the transmission signal.

[0062] In this embodiment, the identification of the control signal transmitted by the cable under test is determined by its communication protocol and the characteristics of the control equipment. Taking the power industry standard DL / T 1074-2019 as an example, the high-level standard voltage of the control signal is 24V (corresponding to logic 1). Considering the influence of voltage fluctuations and line losses, the effective high-level voltage range of the control signal is 20.4V to 28.8V (signal voltages within this range will be identified as high-level signals). Therefore, the high-level identification information includes the high-level standard voltage and the high-level effective range. The low-level standard voltage of the control signal is -22V (corresponding to logic 0). Similarly, considering the influence of voltage fluctuations and line losses, the effective low-level voltage range of the control signal is -18.7V to -26.4V (signal voltages within this range will be identified as low-level signals). The low-level identification information includes the low-level standard voltage and the low-level effective range.

[0063] Accordingly, step S20 includes: setting the amplitude adjustable range in the waveform parameter adjustable range according to the low level identification information and the high level identification information.

[0064] In a preferred embodiment, the adjustable amplitude range can be determined as follows: First, the minimum standard deviation of the low level is calculated based on the low level identification information, and the minimum standard deviation of the high level is calculated based on the high level identification information. Then, the product of the smaller of the minimum standard deviation of the low level and the minimum standard deviation of the high level with the margin coefficient is used as the upper limit of the adjustable amplitude range, and the product of the upper limit of the adjustable amplitude range with the lower limit coefficient is used as the lower limit of the adjustable amplitude range.

[0065] In this embodiment, the minimum standard deviation of the low level refers to the smaller of the absolute values ​​of the differences between the low level standard voltage and the upper and lower limits of the effective low level range. Taking DL / T 1074-2019 as an example, the difference between the low level standard voltage and the lower limit of the effective low level range is 4.4V (equal to -22V minus -26.4V), and the difference between the low level standard voltage and the upper limit of the effective low level range is 3.3V (equal to -18.7V minus -22V). Therefore, the minimum standard deviation of the low level is 3.3V. The minimum standard deviation of the high level refers to the smaller of the absolute values ​​of the differences between the high level standard voltage and the upper and lower limits of the effective high level range. Again, taking DL / T 1074-2019 as an example, the minimum standard deviation of the high level is equal to 3.6V (equal to 24V minus 20.4V). It is easy to understand that taking the smaller of the minimum standard deviation of the low level and the minimum standard deviation of the high level as the reference data for setting the adjustable amplitude range can ensure that a specific signal wave does not affect the transmission of high and low level signals of the cable under test. Adding a margin coefficient can further reduce the adjustable amplitude range, which can further avoid the specific signal wave from interfering with the control signal of the cable under test.

[0066] Optionally, the margin factor is 60%, and the lower limit factor is 30%.

[0067] The environment in which the cable under test is located contains a large amount of electromagnetic interference noise, such as medium and high frequency noise (generally above 500Hz) generated by the operation of nuclear power plant equipment, plus the AC power grid with a frequency of 50Hz. In order to avoid interference with specific signal waves, the frequency of specific signal waves can be set to avoid related frequency bands. Therefore, in a preferred embodiment, step S20 further includes: setting the frequency adjustable range in the adjustable range of waveform parameters to a predetermined frequency range.

[0068] Optionally, the predetermined frequency range can be 30Hz and below.

[0069] Considering that integrating the signal generation and acquisition equipment into a single unit would result in a large device with poor portability, and given the numerous cables requiring continuous inspection in nuclear power plants, which could increase the workload of inspection personnel, in a preferred embodiment, such as... Figure 2As shown, the online cable continuity inspection method for nuclear power plants also includes: S31, connecting the signal generation module 3, the reference cable 2, and the signal acquisition module 4 in series at both ends of the cable to be tested.

[0070] Further, step S40 includes: inputting a specific signal wave to one end of the cable under test through the control signal generation module 3, and acquiring the return signal wave at the other end of the cable under test through the signal acquisition module 4.

[0071] In this embodiment, by separating the signal generation module 3 for generating specific signal waves from the signal acquisition module 4 for acquiring return signal waves, it is beneficial to reduce the size of the equipment required for cable inspection, thereby improving portability, reducing the workload of inspection personnel, and improving inspection efficiency.

[0072] In a preferred embodiment, such as Figure 2 As shown, the reference cable 2 in step S31 is either the preset test cable 21 or a cable that has passed the continuity check.

[0073] In this embodiment, when there are no cables that have passed continuous inspection or no other cables nearby, the signal generation module 3, the cable under test and the signal acquisition module 4 can form a signal transmission loop by using a preset test cable 21. In order to improve anti-interference performance, the length of the preset test cable 21 should be as short as possible.

[0074] In nuclear power plants, some equipment communicates with each other via multiple communication cables (which are also considered cables under test). Furthermore, some equipment has multiple spare cables pre-installed to replace faulty cables. Using a spare cable or cable under test that has passed continuous testing as a reference cable (2) can eliminate the need for laying pre-installed test cables, effectively improving inspection efficiency. This is especially important for cables with large spans, where laying pre-installed test cables is more challenging. Figure 2 As shown, when checking the cable continuity between cabinet 100 and cabinet 200, during the first check, spare cable 22 can be used as a reference cable 2 for checking the continuity of communication cable A. If the continuity check is passed, then spare cable 22 can be used as reference cable 2. Alternatively, communication cables A and B can be used as reference cables 2 for each other. If the continuity check is passed, then the continuity checks of cables A and B are both passed, and therefore both cables A and B can be used as reference cables 2. Furthermore, the continuity can also be checked by using two spare cables as reference cables 2 for each other. If the continuity check is passed, then both spare cables can be used as reference cables 2.

[0075] To further improve the accuracy of the inspection results, after checking the continuity of all cables between the two devices, multiple pairs of cables that have passed the continuity check are randomly selected from the two devices, and the continuity check of these cable pairs is performed again using the method of this embodiment. If the continuity check fails, it is necessary to further determine whether the judgment of the cables that have passed the continuity check in the two devices is accurate.

[0076] Optionally, the preset test cable is a multi-strand copper core flexible wire, which can ensure that the network time constant (the product of the cable's equivalent resistance and equivalent capacitance) is as small as possible, thereby improving the anti-interference performance of the preset test cable.

[0077] In a preferred embodiment, step S10 further includes: obtaining the cable properties of the cable under test;

[0078] Accordingly, in order to accurately assess the continuity of the cable under test, such as Figure 3 As shown, step S50 includes steps S501, S502, S503 and S504.

[0079] S501. Determine the amplitude comparison threshold of the returned signal wave based on the cable properties and the amplitude of the specific signal wave.

[0080] In a preferred embodiment, step S501 includes: calculating the cable impedance of the cable under test based on the cable properties of the cable under test, and calculating the amplitude comparison threshold based on the loop impedance data, the cable impedance of the cable under test, and the amplitude of a specific signal wave, wherein the loop impedance data includes the output impedance of the signal generation module 3, the cable impedance of the reference cable 2, and the load impedance of the signal acquisition module 4.

[0081] Furthermore, in a preferred embodiment, the cable properties of the cable under test include the core material, cable length, and cable cross-sectional area. The cable impedance of the cable under test can be calculated using the following formula (simplified calculation, ignoring the effects of temperature, error, skin effect, proximity effect, and reactance calculation): Where R is the cable impedance, ρ is the resistivity (determined by the wire core material), L is the cable length, and S is the cable cross-sectional area. The amplitude comparison threshold can be calculated using the following formula: Where K is the amplitude measurement error coefficient, Vs ’ R1 is the actual output amplitude of signal generation module 3, R2 is the total impedance, R3 is the load impedance of signal acquisition module 4, R4 is the cable impedance of the cable under test, R5 is the cable impedance of reference cable 2, and Vs is the amplitude of a specific signal wave.

[0082] Optionally, K can be 5% to 13%.

[0083] In some embodiments, the output impedance of the signal generation module 3 is 50Ω, and the load impedance of the signal acquisition module 4 is 10KΩ.

[0084] Since cable impedance is also related to parameters such as conductor structure (spacing, single / multi-strand), temperature, frequency, self-inductance, skin effect, and proximity effect, in order to improve the accuracy of the calculated cable impedance, in some embodiments, the cable properties of the cable under test also include cable temperature and cable transmission signal frequency. In this embodiment, the cable impedance of the cable under test can be calculated based on existing algorithms according to conductor material, cable length, cable cross-sectional area, cable temperature, cable transmission signal frequency, and cable self-inductance. The cable impedance of reference cable 2 can also be calculated in this way.

[0085] S502. Determine whether the amplitude of the returned signal wave is less than the amplitude comparison threshold. If so, determine that the continuity check of the cable under test is unqualified and execute S504; otherwise, execute S503.

[0086] S503. Determine whether the frequency of the returned signal wave exceeds the frequency error range. If so, determine that the continuity check of the cable under test is unqualified and execute S504. Otherwise, determine that the continuity of the cable under test is qualified.

[0087] In this embodiment, the frequency error range can be calculated in the following way: Among them, H t H represents the upper limit of the frequency error range. h Here, j represents the lower limit of the frequency error range, j is the frequency error coefficient, and H1 is the frequency of the specific signal wave.

[0088] S504. Determine whether the number of times the cable under test has been checked exceeds the set number. If so, determine that the continuity of the cable under test is unqualified. Otherwise, reset the amplitude and / or frequency of the specific signal wave according to the waveform characteristics and adjustable range of the waveform parameters of the returned signal wave, and return to S30.

[0089] In a preferred embodiment, the amplitude and / or frequency of a specific signal wave can be reset in the following way: If the amplitude of the returned signal wave is less than the amplitude comparison threshold, it indicates that the cable under test may have a loose connection or open circuit, or the threshold of the specific signal wave may not match the cable impedance of the cable under test. The amplitude of the specific signal wave can be gradually increased. If the frequency of the returned signal wave exceeds the frequency error range, it may be due to a mismatch in the frequency of the specific signal wave, interference from external noise, or a loose connection in the cable under test. To ensure the continuity of the cable under test, the frequency of the specific signal wave should be reset. It is necessary to ensure that the frequency of the returned signal wave is almost the same as the frequency of the specific signal wave to confirm that the continuity check of the cable under test is qualified.

[0090] In an optional embodiment, step S50 can also be implemented by evaluating the continuity of the cable under test in the following way: calculating the attenuation percentage based on the amplitude of the specific signal wave and the amplitude of the return signal wave, determining whether the attenuation percentage is greater than a set comparison threshold; if so, determining that the continuity check of the cable under test is unqualified; otherwise, determining that the continuity check of the cable under test is qualified. Wherein, the attenuation percentage is equal to the quotient of the amplitude of the return signal wave divided by the amplitude of the specific signal wave.

[0091] To improve the operability of continuity checks, in an optional embodiment, step S504 further includes: upon receiving a waveform setting instruction, resetting the amplitude and / or frequency of a specific signal wave according to the waveform setting instruction. In this embodiment, the testing personnel can customize the amplitude and / or frequency of a specific signal wave based on the on-site testing conditions.

[0092] In a preferred embodiment, the transmission signal characteristics and cable attributes of the cable under test can be input through a human-machine interface module, or pre-stored or historical transmission signal characteristics and cable attributes can be selected. Optionally, the human-machine interface module can be a mouse, keyboard, touch screen, etc.

[0093] It should be noted that the returned signal wave refers to the signal wave detected at the other end of the cable under test after a specific signal wave is input to one end of the cable. Because the cable under test has a certain impedance, the amplitude of the specific signal wave will be attenuated to some extent. Furthermore, the frequency of the specific signal wave is affected by the ambient noise surrounding the cable. Therefore, the frequency of the specific signal wave may change, but generally not significantly. Thus, if the continuity of the cable under test is acceptable, the specific signal wave and the returned signal wave will be two sets of waveforms with different amplitudes but essentially the same frequency.

[0094] like Figure 4 and Figure 5 As shown, the present invention also provides a device for inspecting the continuity of online cables in nuclear power plants. This device includes a main control module 1, wherein the main control module 1 includes:

[0095] The first acquisition unit 11 is used to acquire the transmission signal characteristics of the cable under test 5;

[0096] Adjustable range determination unit 12 is used to determine the adjustable range of waveform parameters of a specific signal wave based on the characteristics of the transmitted signal;

[0097] The parameter setting unit 13 is used to set the waveform parameters of a specific signal wave according to the adjustable range of waveform parameters;

[0098] The second acquisition unit 14 is used to acquire the return signal wave output at the other end of the cable under test 5 after a specific signal wave is input to one end of the cable under test 5.

[0099] Evaluation unit 15 is used to evaluate the continuity of cable 5 under test based on specific signal waves and return signal waves.

[0100] In a preferred embodiment, such as Figure 4 and 5 As shown, the nuclear power plant's online cable continuity inspection device also includes a reference cable 2, a signal generation module 3 for generating specific signals, and a signal acquisition module 4 for acquiring return signal waves;

[0101] The signal output terminal of the signal generation module 3 is connected to one end of the cable under test 5, the signal input terminal of the signal acquisition module 4 is connected to the other end of the cable under test 5, and the signal output terminal of the signal acquisition module 4 is connected to the signal input terminal of the signal generation module 3 via the reference cable 2.

[0102] The parameter setting unit 13 is connected to the control terminal of the signal generation module 3 to control the operation of the signal generation module 3; the second acquisition unit 14 is connected to the signal acquisition module 4 to acquire the return signal wave.

[0103] In a preferred embodiment, such as Figure 6 As shown, the signal generation module 3 includes a signal conditioning unit 31, an amplitude display unit 32, a frequency display unit 33, an amplitude adjustment unit 34, a frequency adjustment unit 35, a power supply warning unit 36, and a first interface unit 37.

[0104] The signal conditioning unit 31 is used to generate a specific signal. The signal conditioning unit 31 can be a waveform acquisition circuit or module that can output a sine wave, which is commonly used in the prior art. For easy portability, a smaller model can be selected.

[0105] The amplitude display unit 32 is connected to the signal conditioning unit 31 and is used to display the amplitude of a specific signal.

[0106] The frequency display unit 33 is connected to the signal conditioning unit 31 and is used to display the frequency of a specific signal.

[0107] The amplitude adjustment unit 34 is connected to the signal conditioning unit 31 and is used to adjust the amplitude of a specific signal. The tester can adjust the amplitude of the specific signal by the knob in the amplitude adjustment unit 34, and the adjustment range of the amplitude of the specific signal is determined by the adjustable amplitude range.

[0108] The frequency adjustment unit 35 is connected to the signal conditioning unit 31 and is used to adjust the frequency of a specific signal. The tester can adjust the frequency of the specific signal by the knob in the frequency adjustment unit 35, and the adjustment range of the frequency of the specific signal is determined by the frequency adjustable range.

[0109] The power supply warning unit 36 ​​is used to generate an audible or visual warning signal when the power supply to the signal generation module 3 is insufficient.

[0110] The first interface unit 37 is used to connect to the power supply and provide power to each unit in the signal generation module 3.

[0111] In a preferred embodiment, such as Figure 7 As shown, the signal acquisition module 4 includes a signal processing unit 41, an undervoltage alarm unit 42, a frequency abnormality alarm unit 43, an overvoltage alarm unit 44, a result display unit 45, a second interface unit 46, and a power supply unit 47.

[0112] Furthermore, the undervoltage alarm unit 42, the frequency abnormality alarm unit 43, the overvoltage alarm unit 44, and the result display unit 45 each include an indicator light.

[0113] The signal processing unit 41 is used to acquire the return signal wave. The signal processing unit 41 can be a waveform acquisition circuit or module commonly used in the prior art that can acquire signal waves, such as an oscilloscope. For easy portability, a smaller model can be selected.

[0114] The undervoltage alarm unit 42 is connected to the signal processing unit 41 and is used to alarm when the amplitude of the returned signal wave is undervoltage. Specifically, when the amplitude of the returned signal wave is less than the amplitude comparison threshold, the indicator light included in the undervoltage alarm unit 42 will be lit to remind the tester that the cable 5 under test may be broken, or that the transmission signal characteristics and cable properties may be incorrect.

[0115] The frequency abnormality alarm unit 43 is connected to the signal processing unit 41 and is used to alarm when the frequency of the returned signal wave is abnormal. Specifically, when the frequency of the returned signal wave exceeds the set frequency error range, the indicator light included in the frequency abnormality alarm unit 43 will be lit. Taking a specific signal wave frequency of 30Hz as an example, the set frequency error range includes frequency ranges greater than 40Hz and less than 20Hz. The frequency abnormality may be caused by incorrect wiring of the cable under test 5 or by large external noise interference.

[0116] The overvoltage alarm unit 44 is connected to the signal processing unit 41 and is used to alarm when the peak value of the return signal wave is overvoltage. Specifically, when the peak value of the return signal wave is greater than the set safe voltage, the indicator light included in the overvoltage alarm unit 44 will be lit. The set safe voltage can be determined according to the high-level standard voltage and low-level standard voltage of the control signal transmitted by the cable under test 5.

[0117] The results display unit 45, connected to the evaluation unit 15, is used to display the results of the continuity check.

[0118] The second interface unit 46 is used to connect the input power supply.

[0119] The power supply unit 47 is used to convert the input power supply and provide a suitable power supply for the internal circuit of the signal acquisition module 4.

[0120] In a preferred embodiment, the second acquisition unit 14 is electrically connected to the signal acquisition module 4 to transmit relevant alarm signals to the signal acquisition module 4. The parameter setting unit 13 can control the signal generation module 3 via wireless communication.

[0121] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0122] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software 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 implementations should not be considered beyond the scope of this invention.

[0123] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main 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 known in the art.

[0124] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for inspecting the continuity of online cables in a nuclear power plant, characterized in that, Includes the following steps: S10. Obtain the transmission signal characteristics of the cable under test; the transmission signal characteristics include low-level identification information and high-level identification information of the transmission signal; S20. Determine the adjustable range of waveform parameters for a specific signal wave based on the characteristics of the transmitted signal; S30. Set the waveform parameters of the specific signal wave according to the adjustable range of the waveform parameters; S40. After controlling the specific signal wave to be input to one end of the cable under test, obtain the return signal wave output at the other end of the cable under test; S50. Evaluate the continuity of the cable under test based on the specific signal wave and the return signal wave; S20 includes: setting the amplitude adjustable range in the waveform parameter adjustable range according to the low-level identification information and the high-level identification information, including: calculating the minimum standard deviation of the low level according to the low-level identification information, and calculating the minimum standard deviation of the high level according to the high-level identification information; setting the product of the smaller of the minimum standard deviation of the low level and the minimum standard deviation of the high level with a margin coefficient as the upper limit value of the amplitude adjustable range, and setting the product of the upper limit value of the amplitude adjustable range with a lower limit coefficient as the lower limit value of the amplitude adjustable range.

2. The method for inspecting the continuity of online cables in nuclear power plants according to claim 1, characterized in that, S20 further includes: Set the adjustable frequency range in the adjustable waveform parameter range to a predetermined frequency range.

3. The method for inspecting the continuity of online cables in nuclear power plants according to claim 1, characterized in that, Also includes: S31. Connect the signal generation module, the reference cable, and the signal acquisition module in series at both ends of the cable under test. S40 includes: inputting the specific signal wave to one end of the cable under test by controlling the signal generation module, and acquiring the return signal wave at the other end of the cable under test by the signal acquisition module.

4. The method for inspecting the continuity of online cables in nuclear power plants according to claim 3, characterized in that, In step S31, the reference cable is a preset test cable or a cable that has passed the continuity check.

5. The method for inspecting the continuity of online cables in nuclear power plants according to claim 1, characterized in that, The specific signal wave is a sine wave with a specific frequency and amplitude.

6. The method for inspecting the continuity of online cables in a nuclear power plant according to any one of claims 1 to 5, characterized in that, S10 further includes: acquiring the cable attributes of the cable under test; The S50 includes: S501. Determine the amplitude comparison threshold of the returned signal wave based on the cable properties and the amplitude of the specific signal wave; S502. Determine whether the amplitude of the returned signal wave is less than the amplitude comparison threshold. If so, determine that the continuity check of the cable under test is unqualified and execute S504; otherwise, execute S503. S503. Determine whether the frequency of the returned signal wave exceeds the frequency error range. If so, determine that the continuity check of the cable under test is unqualified and execute S504. Otherwise, determine that the continuity of the cable under test is qualified. S504. Determine whether the number of times the cable under test is checked exceeds the set number. If so, determine that the continuity of the cable under test is unqualified. Otherwise, reset the amplitude and / or frequency of the specific signal wave according to the waveform characteristics and adjustable range of the waveform parameters of the returned signal wave, and return to S30.

7. The method for inspecting the continuity of online cables in nuclear power plants according to claim 6, characterized in that, S501 includes: The cable impedance of the cable under test is calculated based on the cable properties of the cable under test, and the amplitude comparison threshold is calculated based on the loop impedance data, the cable impedance of the cable under test, and the amplitude of a specific signal wave.

8. The method for inspecting the continuity of online cables in nuclear power plants according to claim 6, characterized in that, S504 also includes: Upon receiving a waveform setting instruction, the amplitude and / or frequency of the specific signal wave are reset according to the waveform setting instruction.

9. A device for inspecting the continuity of online cables in nuclear power plants, characterized in that, Includes a main control module (1), which includes: The first acquisition unit (11) is used to acquire the transmission signal characteristics of the cable under test (5); the transmission signal characteristics include low-level identification information and high-level identification information of the transmission signal; Adjustable range determination unit (12) is used to determine the adjustable range of waveform parameters of a specific signal wave according to the characteristics of the transmitted signal, including: setting the adjustable range of amplitude in the adjustable range of waveform parameters according to the low level identification information and the high level identification information; the method of determining the adjustable range of amplitude includes: calculating the minimum standard deviation of low level according to the low level identification information, and calculating the minimum standard deviation of high level according to the high level identification information; setting the product of the smaller value of the minimum standard deviation of low level and the minimum standard deviation of high level with the margin coefficient as the upper limit value of the adjustable range of amplitude, and setting the product of the upper limit value of the adjustable range of amplitude with the lower limit coefficient as the lower limit value of the adjustable range of amplitude; The parameter setting unit (13) is used to set the waveform parameters of the specific signal wave according to the adjustable range of the waveform parameters; The second acquisition unit (14) is used to acquire the return signal wave output at the other end of the cable under test (5) after controlling the specific signal wave to be input to one end of the cable under test (5); Evaluation unit (15) is used to evaluate the continuity of the cable under test (5) based on the specific signal wave and the return signal wave.

10. The nuclear power plant online cable continuity inspection device according to claim 9, characterized in that, It also includes a reference cable (2), a signal generation module (3) for generating the specific signal, and a signal acquisition module (4) for acquiring the returned signal wave; The signal output terminal of the signal generation module (3) is connected to one end of the cable under test (5), the signal input terminal of the signal acquisition module (4) is connected to the other end of the cable under test (5), and the signal output terminal of the signal acquisition module (4) is connected to the signal input terminal of the signal generation module (3) via the reference cable (2). The parameter setting unit (13) is connected to the control terminal of the signal generation module (3) to control the operation of the signal generation module (3); the second acquisition unit (14) is connected to the signal acquisition module (4) to acquire the return signal wave.

11. The nuclear power plant online cable continuity inspection device according to claim 10, characterized in that, The signal generation module (3) includes a signal conditioning unit for generating the specific signal, an amplitude display unit for displaying the amplitude of the specific signal, a frequency display unit for displaying the frequency of the specific signal, an amplitude adjustment unit for adjusting the amplitude of the specific signal, and a frequency adjustment unit for adjusting the frequency of the specific signal.

Images