Nuclear power equipment contaminated cable fault detection method, circuit and device

Abstract

The invention relates to a nuclear power equipment contaminated cable fault detection method, circuit and device, and the method comprises an open circuit detection step, and the open circuit detection step comprises the steps: S11, enabling all cable cores of a first end of a detected cable to be in short circuit through a connector; s12, determining an unmarked wire core of the tested cable as an output wire core, and determining all unmarked wire cores except the output wire core in the tested cable as input wire cores; s13, outputting a test signal to an output wire core; s14, detecting the voltage of the output cable core and the voltage of all the output cable cores at the second end of the detected cable; s15, comparing the voltage of the output wire core with the voltage of each input wire core to obtain a comparison result set; and S16, judging whether the number of the unmarked cable cores in the detected cable is equal to 2, if so, generating a circuit break detection result according to all the comparison result sets, and ending the circuit break detection step, otherwise, marking the output cable cores, and returning to S12. The radiation dosage of workers can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant equipment maintenance, and in particular to a method, circuit and device for detecting contaminated cable faults in nuclear power equipment. Background Art

[0002] In nuclear power plants, cables are crucial physical channels for transmitting electrical signals within and between automated equipment. The correctness of cable connections and their conduction status directly impact the functionality, stability, reliability, and safety of the equipment. However, traditional testing methods require workers to bring instruments (such as multimeters) to the site for testing. However, the front end of the cable is often contaminated with radioactive material, preventing technicians from directly touching or staying close to it for extended periods, making cable fault detection extremely difficult. Furthermore, cables are typically multi-core, requiring testing of each core. This requires workers to work intermittently and for extended periods on-site while wearing protective clothing. This not only endangers workers' personal safety but also results in low detection efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to solve the defect in the prior art that workers need to work for a long time at the end of the cable contaminated by radioactive substances, and to provide a method, circuit and device for detecting contaminated cable faults in nuclear power equipment.

[0004] The technical solution adopted by the present invention to solve the technical problem is to construct a method for detecting contaminated cable faults in nuclear power equipment, including a circuit breaker detection step, wherein the circuit breaker detection step includes:

[0005] S11, short-circuiting all the cores in the first end of the tested cable through a preset connector;

[0006] S12, defining one of the cores of the tested cable that is not marked with the first label as an output core, and defining all the cores of the tested cable that are not marked with the first label except the output core as input cores;

[0007] S13, outputting a test signal to the output core;

[0008] S14, detecting the voltage of the output core and the voltages of all the output cores at the second end of the tested cable;

[0009] S15, comparing the voltage of the output core with the voltage of each input core respectively to obtain a first comparison result set;

[0010] S16. Determine whether the number of unmarked cores in the tested cable is equal to 2. If so, generate a circuit break detection result based on all the first comparison result sets and end the circuit break detection step. Otherwise, perform the first marking on the output cores and return to S12.

[0011] Preferably, the method for detecting contaminated cable faults in nuclear power equipment further includes a short circuit detection step, and the short circuit detection step includes:

[0012] S21, defining one of the cores of the tested cable that is not marked with the second label as an output core, and defining all the cores of the tested cable that are not marked with the second label except the output core as input cores;

[0013] S22, outputting a test signal to the output core;

[0014] S23, detecting the voltage of the output core and the voltages of all the output cores at the second end of the tested cable;

[0015] S24, comparing the voltage of the output core with the voltage of each input core respectively to obtain a second comparison result set;

[0016] S25. Determine whether the number of unmarked cores in the tested cable is equal to 2. If so, generate a short circuit detection result based on all the second comparison result sets and end the open circuit detection step. Otherwise, perform a second marking on the output core and return to S21.

[0017] Preferably, in S15, the step of comparing the voltage of the output core with the voltage of each input core includes: calculating a first difference between the voltage of the output core and the voltage of the input core for each output core, determining whether the first difference is greater than a first set threshold, and if so, determining that there is a short circuit between the output core and the output core; otherwise, determining that there is no short circuit between the output core and the output core;

[0018] In S24, the step of comparing the voltage of the output core with the voltage of each input core includes: calculating a second difference between the voltage of the output core and the voltage of the output core for each output core, determining whether the second difference is greater than a second set threshold, and if so, determining that no short circuit exists between the output core and the output core; otherwise, determining that a short circuit exists between the output core and the output core.

[0019] Preferably, the method for detecting contaminated cable faults in nuclear power equipment further includes a poor contact detection step, wherein the poor contact detection step includes: performing the following steps while continuously changing the physical posture of the cable under test:

[0020] S31, short-circuiting all the cores in the first end of the tested cable through a preset connector;

[0021] S32, defining one of the cores of the tested cable as an output core, and defining all the cores of the tested cable except the output core as input cores;

[0022] S33, outputting a test signal to the output core;

[0023] S34, detecting voltage changes of the output core and all the output cores within a set time at the second end of the tested cable to obtain voltage change data;

[0024] S35. Generate a poor contact detection result according to the voltage change data.

[0025] The present invention also constructs a nuclear power equipment contaminated cable fault detection circuit, which includes a connector, a signal generation module, an output switching module, a voltage comparison module and a control module;

[0026] The connector is used to be detachably connected to the first end of the cable under test according to the detection requirements, so as to short-circuit all the cores of the cable under test;

[0027] The signal generating module is used to output a test signal;

[0028] The output switching module is connected to the signal generating module, and is used to connect to the second end of the tested cable and control one of the cores to output the test signal according to a control instruction;

[0029] The voltage comparison module and the control module are used to connect to the second end of the tested cable, compare the voltage of each core with the test signal, and output a comparison result signal;

[0030] The control module is connected to the output switching module and the voltage comparison module, and is used to perform the circuit breaker detection step;

[0031] The circuit breaker detection step comprises:

[0032] SS11. Determine whether the connector is connected to the first end of the cable under test. If so, execute SS12.

[0033] SS12. Determine one of the cores of the tested cable that is not marked with the first label as an output core, and determine all cores of the tested cable that are not marked with the first label except the output core as input cores.

[0034] SS13, outputting the switching instruction to the switching matrix so that the output core outputs the test signal;

[0035] SS14. Obtain comparison result signals after comparing the voltages of all the output cores with the test signals to obtain a first comparison result set;

[0036] SS15. Determine whether the number of unmarked cores in the tested cable is equal to 2. If so, generate a circuit break detection result based on all the first comparison result sets and end the circuit break detection step. Otherwise, perform the first marking on the output core and return to SS12.

[0037] Preferably, the control module is further configured to perform a short circuit detection step and / or a poor contact detection step;

[0038] The short circuit detection step comprises:

[0039] SS21. Determine one of the cores of the tested cable that is not marked with the second label as an output core, and determine all cores of the tested cable that are not marked with the second label except the output core as input cores.

[0040] SS22, outputting the switching instruction to the switching matrix so that the output core outputs the test signal;

[0041] SS23. Obtain comparison result signals after comparing the voltages of all the output cores with the test signal to obtain a second comparison result set;

[0042] SS24, comparing the voltage of the output core with the voltage of each input core to obtain a second comparison result set, and then executing SS25;

[0043] SS25: Determine whether the number of unmarked cores in the tested cable is equal to 2. If so, generate a circuit break detection result based on all second comparison result sets and terminate the circuit break detection step. Otherwise, perform a second marking on the output cores and return to SS21.

[0044] The poor contact detection step includes: performing the following steps while continuously changing the physical posture of the tested cable:

[0045] SS31, short-circuit all the cores in the first end of the cable under test through a preset connector;

[0046] SS32. Determine one of the cores of the tested cable as an output core, and determine all cores of the tested cable except the output core as input cores;

[0047] SS33, outputting the switching instruction to the switching matrix so that the output core outputs the test signal;

[0048] SS34. Acquire comparison result change data of all the output cores and the test signal within a set time;

[0049] S35. Generate a poor contact detection result according to the voltage change data.

[0050] Preferably, the output switching module includes a plurality of sub-output control units corresponding one-to-one to each of the wire cores;

[0051] Each sub-output control unit includes an isolation drive unit and a switching unit;

[0052] The isolation driving unit includes a first optocoupler, a first switching tube and a first resistor; the anode of the first optocoupler is connected to the control module, the cathode of the first optocoupler is connected to the signal ground, the emitter of the first optocoupler is connected to the power ground, the collector of the first optocoupler is connected to the first DC voltage via the first resistor, the collector of the first optocoupler is also connected to the control end of the first switching tube, the input end of the first switching tube is connected to the switching unit, and the output end of the first switching tube is connected to the power ground;

[0053] The switching unit includes a relay and a second resistor; wherein the relay includes an excitation coil, a first common contact, and a first normally closed contact and a first normally open contact that cooperate with the first common contact; one end of the excitation coil of the relay is connected to the input end of the first switching tube, and the other end of the excitation coil is connected to a third DC voltage; the first common contact is used to connect to the wire core, the first normally closed contact is suspended, and the first normally open contact is connected to the signal generating module via the second resistor;

[0054] When executing the open circuit detection step or the short circuit detection step, the control module controls the first optocoupler in the sub-output control unit corresponding to the output line core to turn on, so that the first switch tube is turned on and the relay is energized. The control module also controls the first optocoupler in the sub-output control unit corresponding to all the input line cores to turn off.

[0055] Preferably, the voltage comparison module includes a plurality of sub-comparison units corresponding one-to-one to each of the wire cores;

[0056] Each sub-comparison unit includes a comparator, a first potentiometer, a second optocoupler and a third resistor; the positive input end of the comparator is connected to the adjustable end of the first potentiometer, the first end of the first potentiometer is connected to the signal generating module, the second end of the first potentiometer is connected to the power supply ground, the negative input end of the comparator is used to connect the wire core, the output end of the comparator is connected to the anode of the second optocoupler, the cathode of the second optocoupler is connected to the power supply ground, the collector of the second optocoupler is connected to the control module to input the comparison result signal to the control module, the collector of the second optocoupler is also connected to the fourth DC voltage through the third resistor, and the emitter of the second optocoupler is connected to the signal ground.

[0057] Preferably, the switching unit further includes a third optical coupler, and the relay further includes a second common contact, and a second normally closed contact and a second normally open contact cooperating with the second common contact;

[0058] In the sub-output control unit and sub-comparison unit corresponding to each of the wire cores, the collector of the second optocoupler is connected to the control module via the second normally closed contact and the second common contact, the second normally open contact is connected to the anode of the third optocoupler, the anode of the third optocoupler is connected to the signal ground, the collector of the third optocoupler is connected to the first normally open contact, and the emitter of the third optocoupler is connected to the power ground.

[0059] The present invention also constructs a nuclear power equipment contaminated cable fault detection device, which includes the nuclear power equipment contaminated cable fault detection circuit described above.

[0060] Implementation of the technical solution of the present invention can reduce radiation doses to workers and improve testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0062] Figure 1 is a flowchart of a circuit breaker detection step in some embodiments of the present invention;

[0063] Figure 2 is a schematic structural diagram of a connector in some embodiments of the present invention;

[0064] Figure 3 It is an equivalent circuit diagram of the input core and the output core when performing the circuit break detection step in the present invention;

[0065] Figure 4 is a flowchart of a short circuit detection step in some embodiments of the present invention;

[0066] Figure 5 is a flowchart of a poor contact detection step in some embodiments of the present invention;

[0067] Figure 6 is a circuit structure block diagram of a contaminated cable fault detection circuit for nuclear power equipment in some embodiments of the present invention;

[0068] Figure 7 is a circuit schematic diagram of a signal generating module in some embodiments of the present invention;

[0069] Figure 8 is a circuit schematic diagram of an isolation drive unit in some embodiments of the present invention;

[0070] Figure 9 is a circuit schematic diagram of a switching unit in some embodiments of the present invention;

[0071] Figure 10 is a circuit schematic diagram of a control chip in some embodiments of the present invention;

[0072] Figure 11 is a circuit schematic diagram of a crystal oscillator circuit in some embodiments of the present invention;

[0073] Figure 12 is a circuit schematic diagram of a reset circuit in some embodiments of the present invention;

[0074] Figure 13 is a circuit schematic diagram of a communication circuit in some embodiments of the present invention;

[0075] Figure 14 is a circuit schematic diagram of a decoupling capacitor circuit in some embodiments of the present invention. DETAILED DESCRIPTION

[0076] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0077] It should be noted that the flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all content and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0078] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0079] The present invention provides a method for detecting a contaminated cable fault in a nuclear power plant. The method may include a circuit breaker detection step. Figure 11 is a flowchart of a circuit breaker detection step in some embodiments of the present invention. The circuit breaker detection step may include step S11, step S12, step S13, step S14, step S15 and step S16.

[0080] Step S11 includes short-circuiting all the cores in the first end of the cable under test using a preset connector. The connector can be a connector that can match the contaminated end interface of the cable under test. For example, if the cable under test has an aviation male connector, the connector can be a matching aviation female connector. Figure 2 This is a schematic diagram of the structure of the connector corresponding to the 20-core cable in some embodiments of the present invention. Figure 2 , A is the front of the connector, which can be inserted into the first end of the cable under test; B is the back of the connector, where the pins in the connector are connected to each other, that is, the connector can short-circuit all the cores in the end of the cable under test that is connected to it.

[0081] Step S12 includes: defining one of the cores of the tested cable that is not marked with the first label as an output core, and defining all the cores of the tested cable that are not marked with the first label except the output core as input cores.

[0082] Step S13 includes: outputting a test signal to the output core. In this step, the test signal may be a voltage signal, and the test signal may be injected into the output core at the second end of the tested cable via a signal generating device or module.

[0083] Step S14 includes: detecting the voltage of the output core and the voltages of all output cores at the second end of the tested cable.

[0084] Step S15 includes: comparing the voltage of the output core with the voltage of each input core respectively to obtain a first comparison result set, and then executing step S16.

[0085] In some embodiments, voltage comparison can be performed by executing the following steps to obtain a first set of comparison results: for each output line core, the following is performed: a first difference between the voltage of the output line core and the voltage of the output line core is calculated, and whether the first difference is greater than a first set threshold value is determined. If so, it is determined that there is a short circuit between the output line core and the output line core; otherwise, it is determined that there is no short circuit between the output line core and the output line core.

[0086] It should be noted that each first comparison result set may include comparison results of each first difference value and the first set threshold value.

[0087] See also Figure 3, 1 is the connector, Signal is the test signal, 100 is the input core, 200 is the output core, the test principle of the circuit break detection step is as follows: under the action of the connector, all the cores at the first end of the tested cable are short-circuited. When the test signal is input, if there is no circuit break between the input core and the output core, the test signal will return from the output core through the connector. Therefore, the voltage of the output core can be compared with the voltage of the input core to determine whether there is a circuit break fault. Figure 3 For example, when there is a short circuit between the output core and the input core, it will be detected that the voltage of the output core is significantly greater than the voltage of the input core (i.e., the first difference is greater than the first set threshold), thereby determining that there is a short circuit. When there is no short circuit between the output core and the input core, due to the line resistance of the tested cable, it will be detected that the voltage of the output core is slightly greater than or close to the voltage of the input core (i.e., the first difference is not greater than the first set threshold). It can be understood that when it is detected that the first difference between the voltage of the output core and the voltage of all output cores is greater than the first set threshold, it can be determined that there is a short circuit fault in the output core itself; further, if there is a short circuit in individual output cores, it will be detected that the first difference between the output core and part of the input cores is greater than the first set threshold, thereby determining that there is a short circuit fault in this part of the input core.

[0088] It can be understood that the first set threshold value can be determined according to the core resistance of the tested cable, and the first set threshold value increases as the core resistance increases.

[0089] Step S16 includes: determining whether the number of unmarked cores in the tested cable is equal to 2; if so, generating a circuit break detection result based on all first comparison result sets, and ending the circuit break detection step; otherwise, performing the first marking on the output cores, and returning to step S12.

[0090] It can be understood that each time step S15 is executed, it is equivalent to completing the open circuit test for the current output core. Thereafter, the current output core will be marked first so that it does not participate in subsequent comparison work. This can simplify subsequent steps and improve detection efficiency.

[0091] In some embodiments, the method for detecting contaminated cable faults in nuclear power equipment may further include a short circuit detection step, such as Figure 4 As shown, the short circuit detection step may include step S21, step S22, step S23, step S24 and step S25.

[0092] It should be noted that, in the short circuit detection step, the first end of the tested cable is suspended.

[0093] Step S21 includes: defining one of the cores of the tested cable that is not marked with the second label as an output core, and defining all the cores of the tested cable that are not marked with the second label except the output core as input cores.

[0094] Step S22 includes: outputting a test signal to the output core. In this step, the test signal can be injected into the output core at the second end of the tested cable by a signal generating device or module.

[0095] Step S23 includes: detecting the voltage of the output core and the voltages of all output cores at the second end of the tested cable.

[0096] Step S24 includes: comparing the voltage of the output core with the voltage of each input core respectively to obtain a second comparison result set, and then executing step S25.

[0097] In some embodiments, in S24, the step of comparing the voltage of the output core with the voltage of each input core includes: calculating the second difference between the voltage of the output core and the voltage of the output core for each output core, and determining whether the second difference is greater than a second set threshold value; if so, it is determined that there is no short circuit between the output core and the output core; otherwise, it is determined that there is a short circuit between the output core and the output core.

[0098] It should be noted that each second comparison result set may include comparison results of each second difference value and the second set threshold value.

[0099] The test principle of the short circuit detection step is as follows: since the connector is not connected to the first end of the cable under test, all the cores at the first end of the cable under test are suspended. When the test signal is input, if there is no short circuit between the input core and the output core, the test signal cannot be returned from the output core. Therefore, it is possible to determine whether there is a short circuit fault by comparing the voltage of the output core with the voltage of the input core. Specifically, when there is a short circuit between the output core and the input core, considering the influence of the line resistance, it will be detected that the voltage of the output core is slightly greater than or close to the voltage of the input core (that is, the second difference is not greater than the second set threshold) and the voltage of the input core, thereby determining the presence of a short circuit. When there is no short circuit between the output core and the input core, it will be detected that the voltage of the output core is significantly greater than the voltage of the input core (that is, the second difference is greater than the second set threshold). It can be understood that when it is detected that the second difference between the voltage of the output core and the voltage of all output cores is greater than the second set threshold, it can be determined that the output core itself does not have a short circuit fault; further, if an individual output core has a short circuit, it will be detected that the second difference between the output core and some input cores is not greater than the second set threshold, thereby determining that these input cores have a short circuit fault.

[0100] It can be understood that the second set threshold value can be determined according to the core resistance of the tested cable, and the second set threshold value increases as the core resistance increases.

[0101] Step S25 includes: determining whether the number of cores in the tested cable that are not marked by the second mark is equal to 2. If so, a short circuit detection result is generated based on all second comparison result sets, and the open circuit detection step is ended; otherwise, the output cores are marked by the second mark, and the process returns to step S21.

[0102] It can be understood that each time step S24 is executed, it is equivalent to completing the short circuit test on the current output core. Thereafter, the current output core will be marked for the second time so that it does not participate in the subsequent comparison work. This can simplify the subsequent steps and improve the detection efficiency.

[0103] In some embodiments, the method for detecting contaminated cable faults in nuclear power equipment may further include a poor contact detection step. The poor contact detection step includes: performing a detection operation while continuously changing the physical posture of the cable under test. Figure 5 Step S31, step S32, step S33, step S34 and step S35 are shown.

[0104] Step S31 includes: short-circuiting all the cores in the first end of the tested cable through a preset connector.

[0105] Step S32 includes: defining one of the cores of the tested cable as an output core, and defining all the cores of the tested cable except the output core as input cores.

[0106] Step S33 includes: outputting a test signal to the output core. In this step, the test signal can be injected into the output core at the second end of the tested cable by a signal generating device or module.

[0107] Step S34 includes: detecting voltage changes of the output core and all output cores within a set time at the second end of the tested cable to obtain voltage change data.

[0108] Step S35 includes: generating a poor contact detection result according to the voltage change data.

[0109] The detection principle of the poor contact detection step is as follows: after the connector is installed to the first end of the cable under test, all the cores will be short-circuited. When there is no poor contact on all the cores, the voltage of the output core is close to or even equal to the voltage of the test signal. Taking into account the influence of the line resistance, the voltage of all input cores will remain at a value less than the test signal voltage. Therefore, it is possible to determine whether the cable under test has a poor contact fault by executing the following steps: Analyze the voltage change data to determine whether the voltage of the output core and all input cores remains greater than the third set threshold within the set time; when the voltage of the output core and all input cores remains greater than the third set threshold, it is determined that the cable under test has no poor contact fault; when the voltage of all input cores jumps back and forth between greater than and not greater than the third set threshold, it is determined that the output core has a poor contact fault; when the voltage of some input cores jumps back and forth between greater than and not greater than the third set threshold, it is determined that these input cores have a poor contact fault.

[0110] In some embodiments, the staff can use existing equipment (such as a robotic arm, etc.) or manually perform actions such as bending and shaking the cable under test that can change the physical posture of the cable under test.

[0111] It should be noted that the open circuit detection step and the short circuit detection step are mainly used to determine whether there are short circuit or open circuit faults in each core of the cable under test in a static environment. The poor contact detection step can be performed only when it is determined that all cores of the cable under test have no short circuit and no open circuit in a static environment.

[0112] It should be noted that, in the present invention, if the cable under test is contaminated, the first end of the cable under test should be the contaminated end, and the second end of the cable under test must be the uncontaminated end. This allows workers to safely perform long-term testing on the first end of the cable under test after installing the connector there. Furthermore, contamination refers to contamination by radiation sources within the plant. For example, the end of the cable closest to a radiation source such as the reactor core, nuclear waste, or nuclear wastewater can be designated as the first end, while the end farther from the radiation source can be designated as the second end.

[0113] Figure 6 This is a block diagram of a circuit structure for detecting contaminated cables in nuclear power equipment, according to some embodiments of the present invention. The circuit may include a connector 1, a signal generating module 2, an output switching module 3, a voltage comparison module 4, and a control module 5. Reference numeral 300 represents the cable under test.

[0114] Connector 1 is designed to be removably connected to the first end of the cable under test, as required, to short-circuit all wires in the cable under test. Connector 1 can be compatible with the contaminated end of the cable under test, effectively short-circuiting all wires at the connected end. Furthermore, connector 1 is only connected to the first end of the cable under test during the disconnection and contact detection steps.

[0115] The signal generating module 2 is used to output a test signal.

[0116] In some embodiments, the test signal is a voltage signal. Figure 7 The signal generating module 2 may include a switching voltage regulator chip IC3, a first inductor L1, a fourth diode D4, an electrolytic capacitor E1, a thirteenth capacitor C13, and a second potentiometer RP27. The input end of the switching voltage regulator chip IC3 is connected to the second DC voltage Vin, the output end of the switching voltage regulator chip IC3 is connected to the first end of the first inductor L1, the second end of the first inductor L1 is connected to the first end of the electrolytic capacitor E1, the cathode of the fourth diode D4, the first end of the thirteenth capacitor C13, and the first end of the second potentiometer RP27, the second end of the electrolytic capacitor E1, the anode of the fourth diode D4, the second end of the thirteenth capacitor C13, and the second end of the second potentiometer RP27 are connected to the power ground, the adjustable end of the second potentiometer RP27 is connected to the feedback end of the switching voltage regulator chip IC3, and the second end of the first inductor L1 is used to output the test signal Vadj.

[0117] In this embodiment, the switching voltage regulator IC IC3, the first inductor L1, the fourth diode D4, the electrolytic capacitor E1, the thirteenth capacitor C13, and the second potentiometer RP27 constitute a switching power supply circuit. The operating principle thereof is described in detail in the prior art and will not be further described here. The electrolytic capacitor E1 and the thirteenth capacitor C13 constitute an output power supply filter circuit, which stabilizes the test signal Vadj. Furthermore, the voltage of the test signal can be controlled by adjusting the second potentiometer RP27.

[0118] In some embodiments, as Figure 7 As shown, the signal generating module 2 may further include a fuse F2, a fourth resistor R4, and an indicator LED1. The first end of the fuse F2 is connected to the second end of the first inductor L1. The second end of the fuse F2 is used to output the test signal Vadj. The second end of the fuse F2 is also connected to the power ground via the fourth resistor R4 and the indicator LED1. In this embodiment, the fuse F2 is designed to disconnect when the test signal output has an overcurrent, preventing damage to the test circuit. The indicator LED1 is used to indicate whether the test signal output is normal.

[0119] In some embodiments, the switching voltage regulator chip IC3 is a switching voltage regulator chip of model LM2596-ADJ.

[0120] The output switching module 3 is connected to the signal generating module 2 . The output switching module 3 is used to connect to the second end of the cable under test and control one of the cores to output a test signal according to a control instruction.

[0121] In some embodiments, the output switching module 3 includes a plurality of sub-output control units corresponding to each line core. Each sub-output control unit is connected to the control module 5, the signal generating module 2, and the corresponding line core, and controls the connection or disconnection between the corresponding line core and the signal generating module according to the switching instruction output by the control module 5.

[0122] In some embodiments, each sub-output control unit may include Figure 8 The isolation driving unit 311 and Figure 9 The switching unit 312. The isolation drive unit 311 is connected to the control module 5 and is configured to isolate the switching instruction and output a power switching signal based on the switching instruction. The switching unit 312 is connected to the isolation drive unit 311 and the signal generating module 2. The switching unit 312 is configured to connect to the corresponding wire core. Upon receiving the power switching signal, the switching unit 312 connects the corresponding wire core to the first end of the first inductor L1 in the signal generating module 2 to obtain the test signal.

[0123] In some embodiments, as Figure 8 As shown, the isolation driving unit 311 may include a first optocoupler 3111, a first switch tube 3112, and a first resistor 3113. The anode of the first optocoupler 3111 is connected to the control module 5, the cathode of the first optocoupler 3111 is connected to the signal ground, the emitter of the first optocoupler 3111 is connected to the power ground, the collector of the first optocoupler 3111 is connected to the first DC voltage via the first resistor 3113, the collector of the first optocoupler 3111 is also connected to the control terminal of the first switch tube 3112, the input terminal of the first switch tube 3112 is connected to the switching unit 312, and the output terminal of the first switch tube 3112 is connected to the power ground.

[0124] It should be noted that due to the large number of sub-output control units in the present invention, a large number of first optocouplers 3111 and first switching transistors 3112 are required. In this embodiment, the first optocoupler 3111 corresponds to one of the optocouplers in the optocoupler integrated chip U131, which can be a model TLP291-4. That is, the optocoupler integrated chip U131 can provide the first optocouplers 3111 for four sub-output control units. Similarly, the first switching transistor 3112 is one of the Darlington transistors in the Darlington transistor array U138, which can be a model ULN2003AD. It can simultaneously provide the first switching transistors 3112 for seven sub-output control units. Alternatively, the first switch 3112 may be replaced by a separate PNP transistor, with the control terminal, input terminal, and output terminal of the first switch 3112 corresponding to the base, collector, and emitter of a Darlington transistor, or to the base, collector, and emitter of a PNP transistor, respectively. It will be appreciated that, since this embodiment employs a Darlington transistor array, the emitter of the Darlington transistor serves as the common emitter of the Darlington transistor array, and the common cathode of the Darlington transistor array is also connected to the second DC voltage Vin (which may be equal to 12V) to provide a pull-up function.

[0125] The voltage comparison module 4 and the control module 5 are used to connect the second end of the tested cable, compare the voltage of each core with the test signal, and output a comparison result signal.

[0126] See also Figure 8 The operating principle of the sub-output control unit is as follows: when the control module 5 outputs a high-level switching instruction to the anode of the first optocoupler 3111, the first optocoupler 3111 is turned on, and the collector of the first optocoupler 3111 outputs a low-level signal to the first switch tube 3112, causing the input end of the first switch tube 3112 to output a low-level signal (equivalent to the power switching signal) to the switch unit 312. Conversely, when the control module 5 outputs a low-level switching instruction to the anode of the first optocoupler 3111, the first optocoupler 3111 is turned off, and the collector of the first optocoupler 3111 outputs no power switching signal or is set to a high level due to the pull-up action of the common cathode of the Linton transistor array. It can be understood that the first optocoupler 3111 acts as an isolation control signal, allowing the control module 5 to output the switching instruction to the switch unit 312 in an isolated manner. Since the operating voltage of the switching unit 312 is generally higher than that of the control module 5, the control module 5 cannot directly drive the switching unit 312. The first switch tube 3112 plays the role of amplifying the switching instruction amplitude, so that the control module 5 can control the switching unit 312 to work.

[0127] Voltage comparison module 4 includes multiple sub-comparison units 41 corresponding to each wire core. Sub-comparison unit 41 is connected to signal generation module 2 and control module 5. Sub-comparison unit 41 is configured to connect to one of the wire cores at the second end of the cable under test, compare the voltage of the connected wire core with the voltage of the test signal, and output a comparison result signal to control module 5.

[0128] In some embodiments, as Figure 9 As shown, each sub-comparison unit 41 may include a comparator 411, a first potentiometer 412, a second optocoupler 413, and a third resistor 414. The positive input terminal of the comparator 411 is connected to the adjustable terminal of the first potentiometer 412, the first terminal of the first potentiometer 412 is connected to the signal generating module 2, the second terminal of the first potentiometer 412 is connected to the power ground, the negative input terminal of the comparator 411 is used to connect to the wire core, the output terminal of the comparator 411 is connected to the anode of the second optocoupler 413, the cathode of the second optocoupler 413 is connected to the power ground, the collector of the second optocoupler 413 is connected to the control module 5 to input the comparison result signal to the control module 5, the collector of the second optocoupler 413 is also connected to the fourth DC voltage via the third resistor 414, and the emitter of the second optocoupler 413 is connected to the signal ground.

[0129] Because the cable under test has a certain line resistance, and the purpose of providing the first potentiometer 412 in this embodiment is to compensate for the line resistance, it is understandable that a worker can adjust the resistance or voltage difference between the first end and the adjustable end of the first potentiometer 412 by operating the first potentiometer 412 (equivalent to adjusting the first set threshold, the second set threshold, or the third set threshold). It should be noted that the resistance between the first end and the adjustable end of the first potentiometer 412 should not be less than the sum of the resistance of the second resistor 3122 and twice the line core resistance.

[0130] It should be noted that, since the number of the sub-comparison units 41 in the present invention is relatively large, this means that the number of comparators 411 required is also relatively large. In this embodiment, the comparator 411 corresponds to one of the comparators of the integrated comparator U3. The integrated comparator U3 can be an integrated comparator of model LM393D, that is, the integrated comparator U3 can provide comparators 411 to two sub-comparison units 41 at the same time. Moreover, if Figure 9 As shown, every two comparators 411 may share one first potentiometer 412 .

[0131] The control module 5 is connected to the output switching module 3 and the voltage comparison module 4 , and is used to perform the circuit breaker detection step.

[0132] The disconnection detection step includes steps SS11 to SS15.

[0133] Step SS11 includes determining whether connector 1 is connected to the first end of the cable under test, and if so, executing SS12. In this embodiment, the control module 5 can output a request to confirm whether connector 1 is connected to the first end of the cable under test via a human-computer interaction device (which may include a touch screen or a mouse, keyboard, and display). A staff member can confirm that connector 1 is connected to the first end of the cable under test by operating the human-computer interaction device (such as clicking or touching the mouse), and only then will the control module 5 execute the next step.

[0134] Step SS12 includes: determining one of the cores of the tested cable that is not marked with the first label as an output core, and determining all the cores of the tested cable that are not marked with the first label except the output core as input cores.

[0135] Step SS13 includes: outputting a switching instruction to the switching matrix so that the output core outputs a test signal.

[0136] Step SS14 includes: acquiring comparison result signals after comparing the voltages of all output cores with the test signal to obtain a first comparison result set.

[0137] Step SS15 includes: determining whether the number of unmarked cores in the tested cable is equal to 2; if so, generating a circuit break detection result based on all first comparison result sets and ending the circuit break detection step; otherwise, performing the first marking on the output cores and returning to step SS12.

[0138] See also Figure 8 and Figure 9 , the test principle of the circuit breaker detection step is as follows:

[0139] Step S11, determining whether connector 1 is connected to the first end of the cable under test;

[0140] In steps S12 to S14, after determining that the connector 1 is connected to the first end of the cable under test, the control module 5 outputs a high-level switching instruction to the first optocoupler 3111 in the sub-output control unit corresponding to the core, so as to control the first optocoupler 3111 to be turned on, so as to turn on the first switch tube 3112 and energize the relay 3121, thereby connecting the output core to the signal generating module 2, which is equivalent to outputting a test signal to the output core or causing the output core to output a test signal. At the same time, the control module 5 also outputs a low-level switching instruction to the first optocouplers 3111 in the sub-output control units corresponding to all input cores, thereby turning off some of the first optocouplers 3111, turning off the first switch tube 3112, and demagnetizing the relay 3121, thereby disconnecting the output core from the signal generating module 2 and leaving it suspended.

[0141] In step S15, the control module 5 obtains the comparison result signals output by each sub-comparison unit 41 corresponding to each input core, and forms a first comparison result set through these comparison result signals. Figure 9 For example, assuming that Line 1 is an output line and Line 2 is one of the input lines, when there is no break between Line 1 and Line 2, comparator 411 outputs a low level (i.e., 2OUT is low) to second optocoupler 413, which turns off. Under the pull-up action of third resistor 414, control module 5 receives a high level (i.e., TestCH2 is high), thereby determining that there is no break between Line 1 and Line 2. When there is a break between Line 1 and Line 2, comparator 411 outputs a high level (i.e., 2OUT is high) to second optocoupler 413, which turns on. Control module 5 receives a low level (i.e., TestCH2 is low), thereby determining that there is a break between Line 1 and Line 2. It is understandable that the method for determining whether there is a break between other lines and Line 1 is the same as the above method, and can be referenced by reference, and will not be repeated here. When the disconnection detection step is completed, it is possible to determine whether there is a disconnection fault between each core and all other cores by analyzing all first comparison result sets, that is, the disconnection detection result includes the analysis result of whether there is a disconnection fault between each core and all other cores.

[0142] In some embodiments, the control module 5 is further configured to perform a short circuit detection step and / or a poor contact detection step.

[0143] The short circuit detection step includes steps SS21 to SS25.

[0144] Step SS21 includes: determining one of the cores of the tested cable that is not marked with the second label as an output core, and determining all the cores of the tested cable that are not marked with the second label except the output core as input cores.

[0145] Step SS22 includes: outputting a switching instruction to the switching matrix so that the output core outputs a test signal.

[0146] Step SS23 includes: obtaining comparison result signals after comparing the voltages of all output cores with the test signal to obtain a second comparison result set.

[0147] Step SS24 includes: comparing the voltage of the output core with the voltage of each input core to obtain a second comparison result set, and then executing SS25.

[0148] Step SS25 includes: determining whether the number of cores in the tested cable that are not marked with the second mark is equal to 2. If so, a circuit break detection result is generated based on all second comparison result sets, and the circuit break detection step is ended; otherwise, the output cores are marked with the second mark, and the process returns to step SS21.

[0149] See also Figure 8 and Figure 9 The test principle of the short circuit detection step is as follows: It is easy to understand that the specific operations of steps SS21 to SS23 of the short circuit detection step are the same as those of steps SS12 to SS14 of the open circuit detection step. Please refer to the above and will not be repeated here. The difference is that step SS25 is used to Figure 9 For example, connector 1 is not connected to the first end of the cable under test. Assuming that line 1 is the output line and line 2 is one of the input lines, when Line 1 and Line 2 are short-circuited, the comparator 411 outputs a low level (i.e., 2OUT is low) to the second optocoupler 413, and the second optocoupler 413 is turned off. Under the pull-up action of the third resistor 414, the control module 5 receives a high level (i.e., TestCH2 is high), thereby determining that there is a short circuit fault between Line 1 and Line 2; when Line 1 and Line 2 are not short-circuited, the comparator 411 outputs a high level (i.e., 2OUT is high) to the second optocoupler 413, and the second optocoupler 413 is turned on. The control module 5 receives a low level (i.e., TestCH2 is low), thereby determining that there is no short circuit between Line 1 and Line 2. It should be noted that the method for determining whether other line cores are short-circuited with Line 1 is the same as the above method, and can be referenced by each other and will not be repeated here. Accordingly, the short circuit detection result includes an analysis result of whether there is a short circuit fault between each wire core and all other wire cores.

[0150] The poor contact detection step includes: executing steps SS31 to SS34 while continuously changing the physical posture of the tested cable.

[0151] Step SS31 includes: short-circuiting all the cores in the first end of the tested cable through a preset connector 1 .

[0152] Step SS32 includes: defining one of the cores of the tested cable as an output core, and defining all the cores of the tested cable except the output core as input cores.

[0153] Step SS33 includes: outputting a switching instruction to the switching matrix so that the output core outputs a test signal.

[0154] Step SS34 includes: obtaining comparison result change data of all output cores and the test signal within a set time.

[0155] Step SS35 includes: generating a poor contact detection result according to the voltage change data.

[0156] See also Figure 8 and Figure 9 The testing principle of the poor contact detection step is as follows: It is easy to understand that the specific operations of steps SS31 to SS33 of the short circuit detection step are the same as those of steps SS11 to SS13 of the open circuit detection step. Please refer to the above and will not be repeated here. The difference lies in steps SS34 and SS35. Figure 9 For example, assuming Line 1 is an output line and Line 2 is one of the input lines, in step SS34, when Line 1 and Line 2 are in good contact, control module 5 will detect that TestCH2 remains high for a set period of time. When Line 1 and Line 2 are in poor contact, control module 5 will detect that TestCH2 transitions between high and low levels for a set period of time. Furthermore, it should be noted that the method for determining whether other lines have poor contact with Line 1 is the same as the above method, and can be used for reference. The comparison result change data includes records of level changes at the collector output of the second optocoupler 413 corresponding to all input lines. Step SS35, analyzing the voltage change data, when it is determined that the output core has poor contact with all the input cores, generating a poor contact detection result of "the output core has poor contact"; when it is determined that the output core has no poor contact with all the input cores, generating a poor contact detection result of "the tested cable has no poor contact"; when it is determined that the output core has poor contact with some of the input cores, generating a poor contact detection result of "some of the input cores have poor contact" and outputting the serial numbers of these input cores.

[0157] In some embodiments, the serial number of the input core with poor contact may be determined by numbering the sub-comparison units 41 in advance, and setting the serial number of the input core as the serial number of the sub-comparison unit 41 connected thereto.

[0158] It should be noted that in the present invention, the light-emitting anode, light-emitting cathode, light-receiving collector and light-receiving emitter of all optocouplers are referred to as anode, cathode, collector and emitter respectively.

[0159] In some embodiments, as Figure 9As shown, the switching unit 312 may include a relay 3121 and a second resistor 3122. Relay 3121 includes an excitation coil, a first common contact, and a first normally closed contact and a first normally open contact that cooperate with the first common contact. Specifically, when the excitation coil is energized, the first common contact connects to the first normally open contact, and when the excitation coil is deenergized, the first common contact connects to the first normally closed contact. One end of the excitation coil of relay 3121 is connected to the input of the first switching tube 3112, and the other end of the excitation coil is connected to a third DC voltage. The first common contact is used to connect to one of the cores at the second end of the cable under test. The first normally closed contact is left floating, and the first normally open contact is connected to the signal generating module 2 via the second resistor 3122.

[0160] In order to ensure that the hardware circuit functions normally before testing, in some embodiments, such as Figure 9 As shown, the switching unit 312 may further include a third optical coupler 3123. Correspondingly, the relay 3121 further includes a second common contact, and a second normally closed contact and a second normally open contact cooperating with the second common contact. When the excitation coil of the relay 3121 is energized, the second common contact is connected to the second normally open contact. When the excitation coil of the relay 3121 is deenergized, the second common contact is connected to the second normally closed contact.

[0161] Specifically, in the sub-output control unit and sub-comparison unit 41 corresponding to each line core, the collector of the second optocoupler 413 is connected to the control module 5 via the second normally closed contact and the second common contact, the second normally open contact is connected to the anode of the third optocoupler 3123, the anode of the third optocoupler 3123 is connected to the signal ground, the collector of the third optocoupler 3123 is connected to the first normally open contact, and the emitter of the third optocoupler 3123 is connected to the power ground.

[0162] See also Figure 8 and Figure 9The step of performing self-test on the sub-output control unit corresponding to Line 1 and the sub-comparison unit 41 corresponding to Line 2 includes: the control module 5 outputs a high-level switching instruction to the first optocoupler 3111 corresponding to Line 1, so that the relay 3121 corresponding to Line 1 switches between high and low levels of TestCH1, and at the same time monitors the voltage changes output by the collectors of the second optocouplers 413 corresponding to other cores. When the connector 1 is connected to the cable under test, the relay 3121 corresponding to TestCH2 loses its magnetism. When TestCH2 is at a low level, the collector of the second optocoupler 413 corresponding to Line 2 is detected to output a high level. When TestCH2 is at a high level, the collector of the second optocoupler 413 corresponding to Line 2 is detected to output a low level, indicating that the sub-output control unit corresponding to Line 1 and the sub-comparison unit 41 corresponding to Line 2 are both normal. It can be understood that the self-test principles of the sub-output control units and sub-comparison units 41 of other cores are the same as those above, that is, the specific self-test steps may include: defining each core as an output core in turn; after defining the output core each time, defining all other cores as input cores, and performing the following steps: outputting a switching instruction to control the excitation of the relay 3121 corresponding to the output core and the demagnetization of the relays 3121 corresponding to all input cores, and then outputting a square wave signal to the second common contact of the relay 3121 corresponding to the output core, and at the same time detecting the level of the collector of the second optocoupler 413 corresponding to all input cores to obtain level change data; analyzing the level change data to determine whether the sub-output control unit of the output core is normal, and whether the sub-comparison units 41 of all input cores are normal, and finally outputting the self-test analysis results.

[0163] In some embodiments, the control module 5 may include a human-computer interaction device, a control chip U152, a crystal oscillator circuit for providing a clock signal to the control chip U152, a reset circuit for resetting the control chip U152 according to operation control, a communication circuit for communicating with the human-computer interaction device, and a decoupling capacitor circuit for decoupling the power supply of the control chip U152.

[0164] In some embodiments, the human-computer interaction device may include a touch screen, or may include a host, a display, a mouse, and a keyboard. The host may be a computer host that communicates with the control unit, displays the test results on the display, and receives control commands input by the operator through the mouse and keyboard.

[0165] In some embodiments, as Figure 10 As shown, the control chip U152 can be an existing single chip microcomputer or microprocessor. In addition, the specific connection relationship between the control chip U152 and the output switching module 3 and the voltage comparison module 4. The crystal oscillator circuit is used for the circuit structure given, please refer to Figures 7 to 10 , I will not go into details here.

[0166] In some embodiments, as Figure 11 As shown, the crystal oscillator circuit may include a crystal oscillator X1, a first capacitor C1, and a second capacitor C2. The crystal oscillator X1 is connected in parallel to the control chip U152, and one end of the crystal oscillator X1 is connected to the other end of the crystal oscillator X1 via the first capacitor C1 and the second capacitor C2.

[0167] In some embodiments, as Figure 12 As shown, the reset circuit may include a button SW1, a third capacitor C3 and an eighth resistor R8. For the specific connection structure between the reset circuit and the control chip U152, please refer to Figure 10 and Figure 12 When the control chip U152 is down, the staff can press the button SW1 to reset the program of the control chip U152.

[0168] In some embodiments, as Figure 13 As shown, the communication circuit may include a serial communication chip U9 of model CH340N. The serial communication chip U9 is connected to the control chip U152 and the human-computer interaction device.

[0169] In some embodiments, as Figure 14 As shown, the decoupling capacitor circuit may include a plurality of capacitors (including C5 to C8) connected between the power supply terminal of the control chip U152 and the signal ground.

[0170] It should be noted that, in this embodiment, the first to third DC voltages can be provided by an existing DC power supply module, which is not limited here.

[0171] The present invention further provides a nuclear power equipment contaminated cable fault detection device, comprising the nuclear power equipment contaminated cable fault detection circuit provided in an embodiment of the present invention.

[0172] It can be understood that the technical solution of the present invention can use a preset connector to connect the first end of the cable to be tested when necessary, so as to realize automatic detection of each core of the cable to be tested at the uncontaminated end to determine whether the cable to be tested has a fault, which not only reduces the radiation dose of the staff, but also improves the test efficiency.

[0173] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0174] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0175] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0176] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A method for detecting contaminated cable faults in nuclear power equipment, characterized in that: The method comprises a circuit breaker detection step, wherein the circuit breaker detection step comprises: S11, short-circuiting all the cores in the first end of the tested cable through a preset connector; S12, defining one of the cores of the tested cable that is not marked with the first label as an output core, and defining all the cores of the tested cable that are not marked with the first label except the output core as input cores; S13, outputting a test signal to the output core; S14, detecting the voltage of the output core and the voltages of all the output cores at the second end of the tested cable; S15, comparing the voltage of the output core with the voltage of each input core respectively to obtain a first comparison result set; S16. Determine whether the number of unmarked cores in the tested cable is equal to 2. If so, generate a circuit break detection result based on all the first comparison result sets and end the circuit break detection step. Otherwise, perform the first marking on the output cores and return to S12.

2. The method for detecting contaminated cable faults in nuclear power equipment according to claim 1, characterized in that: It is characterized in that The short circuit detection step is further included, and the short circuit detection step includes: S21, defining one of the cores of the tested cable that is not marked with the second label as an output core, and defining all the cores of the tested cable that are not marked with the second label except the output core as input cores; S22, outputting a test signal to the output core; S23, detecting the voltage of the output core and the voltages of all the output cores at the second end of the tested cable; S24, comparing the voltage of the output core with the voltage of each input core respectively to obtain a second comparison result set; S25. Determine whether the number of unmarked cores in the tested cable is equal to 2. If so, generate a short circuit detection result based on all the second comparison result sets and end the open circuit detection step. Otherwise, perform a second marking on the output core and return to S21.

3. The method for detecting contaminated cable faults in nuclear power equipment according to claim 2, characterized in that: In S15, the step of comparing the voltage of the output core with the voltage of each input core includes: calculating a first difference between the voltage of the output core and the voltage of the input core for each output core, determining whether the first difference is greater than a first set threshold, and if so, determining that there is a short circuit between the output core and the input core; otherwise, determining that there is no short circuit between the output core and the input core; In S24, the step of comparing the voltage of the output core with the voltage of each input core includes: calculating a second difference between the voltage of the output core and the voltage of the output core for each output core, determining whether the second difference is greater than a second set threshold, and if so, determining that no short circuit exists between the output core and the output core; otherwise, determining that a short circuit exists between the output core and the output core.

4. The method for detecting contaminated cable faults in nuclear power equipment according to any one of claims 1 to 3, characterized in that: The method further includes a poor contact detection step, wherein the poor contact detection step includes: performing the following steps while continuously changing the physical posture of the tested cable: S31, short-circuiting all the cores in the first end of the tested cable through a preset connector; S32, defining one of the cores of the tested cable as an output core, and defining all the cores of the tested cable except the output core as input cores; S33, outputting a test signal to the output core; S34, detecting voltage changes of the output core and all the output cores within a set time at the second end of the tested cable to obtain voltage change data; S35. Generate a poor contact detection result according to the voltage change data.

5. A nuclear power equipment contaminated cable fault detection circuit, characterized in that: It includes a connector, a signal generation module, an output switching module, a voltage comparison module and a control module; The connector is used to be detachably connected to the first end of the cable under test according to the detection requirements, so as to short-circuit all the cores of the cable under test; The signal generating module is used to output a test signal; The output switching module is connected to the signal generating module, and is used to connect to the second end of the tested cable and control one of the cores to output the test signal according to a control instruction; The voltage comparison module and the control module are used to connect to the second end of the tested cable, compare the voltage of each core with the test signal, and output a comparison result signal; The control module is connected to the output switching module and the voltage comparison module, and is used to perform the circuit breaker detection step; The circuit breaker detection step comprises: SS11. Determine whether the connector is connected to the first end of the cable under test. If so, execute SS12. SS12. Determine one of the cores of the tested cable that is not marked with the first label as an output core, and determine all cores of the tested cable that are not marked with the first label except the output core as input cores. SS13, outputting the switching instruction to the switching matrix so that the output core outputs the test signal; SS14. Obtain comparison result signals after comparing the voltages of all the output cores with the test signals to obtain a first comparison result set; SS15. Determine whether the number of unmarked cores in the tested cable is equal to 2. If so, generate a circuit break detection result based on all the first comparison result sets and end the circuit break detection step. Otherwise, perform the first marking on the output core and return to SS12.

6. The nuclear power equipment contaminated cable fault detection circuit according to claim 5, characterized in that: The control module is further configured to perform a short circuit detection step and / or a poor contact detection step; The short circuit detection step comprises: SS21. Determine one of the cores of the tested cable that is not marked with the second label as an output core, and determine all cores of the tested cable that are not marked with the second label except the output core as input cores. SS22, outputting the switching instruction to the switching matrix so that the output core outputs the test signal; SS23. Obtain comparison result signals after comparing the voltages of all the output cores with the test signal to obtain a second comparison result set; SS24, comparing the voltage of the output core with the voltage of each input core to obtain a second comparison result set, and then executing SS25; SS25: Determine whether the number of unmarked cores in the tested cable is equal to 2. If so, generate a circuit break detection result based on all second comparison result sets and terminate the circuit break detection step. Otherwise, perform a second marking on the output cores and return to SS21. The poor contact detection step includes: performing the following steps while continuously changing the physical posture of the tested cable: SS31, short-circuit all the cores in the first end of the cable under test through a preset connector; SS32. Determine one of the cores of the tested cable as an output core, and determine all cores of the tested cable except the output core as input cores; SS33, outputting the switching instruction to the switching matrix so that the output core outputs the test signal; SS34. Acquire comparison result change data of all the output cores and the test signal within a set time; S35. Generate a poor contact detection result according to the voltage change data.

7. The nuclear power equipment contaminated cable fault detection circuit according to claim 5 or 6, characterized in that: The output switching module includes a plurality of sub-output control units corresponding to each of the line cores; Each sub-output control unit includes an isolation drive unit and a switching unit; The isolation driving unit includes a first optocoupler, a first switching tube and a first resistor; the anode of the first optocoupler is connected to the control module, the cathode of the first optocoupler is connected to the signal ground, the emitter of the first optocoupler is connected to the power ground, the collector of the first optocoupler is connected to the first DC voltage via the first resistor, the collector of the first optocoupler is also connected to the control end of the first switching tube, the input end of the first switching tube is connected to the switching unit, and the output end of the first switching tube is connected to the power ground; The switching unit includes a relay and a second resistor; wherein the relay includes an excitation coil, a first common contact, and a first normally closed contact and a first normally open contact that cooperate with the first common contact; one end of the excitation coil of the relay is connected to the input end of the first switching tube, and the other end of the excitation coil is connected to a third DC voltage; the first common contact is used to connect to the wire core, the first normally closed contact is suspended, and the first normally open contact is connected to the signal generating module via the second resistor; When executing the open circuit detection step or the short circuit detection step, the control module controls the first optocoupler in the sub-output control unit corresponding to the output line core to turn on, so that the first switching tube is turned on and the relay is energized. The control module also controls the first optocoupler in the sub-output control unit corresponding to all the input line cores to turn off.

8. The nuclear power equipment contaminated cable fault detection circuit according to claim 7, characterized in that: The voltage comparison module includes a plurality of sub-comparison units corresponding one to one to each of the line cores; Each sub-comparison unit includes a comparator, a first potentiometer, a second optocoupler and a third resistor; the positive input end of the comparator is connected to the adjustable end of the first potentiometer, the first end of the first potentiometer is connected to the signal generating module, the second end of the first potentiometer is connected to the power supply ground, the negative input end of the comparator is used to connect the wire core, the output end of the comparator is connected to the anode of the second optocoupler, the cathode of the second optocoupler is connected to the power supply ground, the collector of the second optocoupler is connected to the control module to input the comparison result signal to the control module, the collector of the second optocoupler is also connected to the fourth DC voltage through the third resistor, and the emitter of the second optocoupler is connected to the signal ground.

9. The nuclear power equipment contaminated cable fault detection circuit according to claim 8, characterized in that: The switching unit further includes a third optical coupler, and the relay further includes a second common contact, and a second normally closed contact and a second normally open contact cooperating with the second common contact; In the sub-output control unit and sub-comparison unit corresponding to each of the wire cores, the collector of the second optocoupler is connected to the control module via the second normally closed contact and the second common contact, the second normally open contact is connected to the anode of the third optocoupler, the anode of the third optocoupler is connected to the signal ground, the collector of the third optocoupler is connected to the first normally open contact, and the emitter of the third optocoupler is connected to the power ground.

10. A nuclear power equipment contaminated cable fault detection device, characterized in that: The invention comprises a nuclear power equipment contaminated cable fault detection circuit as described in any one of claims 5 to 9.

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