A method and device for detecting insulation aging of superconducting cable based on polarization current

Abstract

The present disclosure is about a method and device for detecting insulation aging of a superconducting cable based on polarization current, including: obtaining the main insulator capacitance data and preset polarization voltage corresponding to the target superconducting cable; determining the target precharge voltage based on the preset polarization voltage; performing capacitance analysis on the precharge capacitor based on the target precharge voltage, the main insulator capacitance data and the preset polarization voltage to obtain the target capacitance data; performing capacitance adjustment processing on the precharge capacitor based on the target capacitance data to obtain the adjusted precharge capacitance; performing a charging operation on the adjusted precharge capacitance; performing a preset polarization detection operation on the target superconducting cable based on the power supply, the preset polarization voltage and the adjusted precharge capacitance so that the main insulation of the target superconducting cable flows through the target polarization current; performing insulation aging detection on the target superconducting cable based on the target polarization current to obtain the insulation aging detection result. The embodiments of the present disclosure can improve the accuracy of insulation aging detection of superconducting cables.

Description

Technical Field

[0001] The present disclosure relates to the technical field of superconducting cable insulation aging detection, and in particular to a superconducting cable insulation aging detection method and device based on polarization current. Background Art

[0002] With the continuous advancement of urbanization, the contradiction between the rising electricity load in the central urban area and the shortage of transmission corridor resources has become increasingly prominent. The transmission capacity of superconducting cables is equivalent to 4 to 8 conventional cables of the same voltage level. It is an excellent solution to this problem to effectively save underground corridor resources and reduce the voltage level of substations. During the long-term operation of superconducting cables, the main insulating material PPLP (polypropylene laminated paper) will age under long-term voltage and stress. An insulation detection method is needed to evaluate the insulation state of superconducting cables. The polarization current method is a non-destructive insulation diagnosis method based on dielectric response theory. A DC voltage is applied through the insulation of the equipment, and the current flowing through the insulation is the polarization current. Due to the different insulation states of superconducting cables, the polarization current presents different characteristics, and the insulation state of superconducting cables is judged based on these characteristics.

[0003] Since superconducting cables operate in a liquid nitrogen low-temperature environment (-197°C), the insulation resistance of the main insulation is relatively large, and the polarization current is relatively small under the same DC voltage, which will affect the measurement accuracy of the polarization current. In addition, in the process of measuring the polarization current, the DC voltage applied to the insulation first charges the body capacitance. Since the body capacitance of the main insulation of the superconducting cable can reach the microfarad level, the body capacitance charging current will be much larger than the polarization current in the initial measurement, which will affect the accuracy of the polarization current in the early stage. Therefore, the current measurement accuracy of the polarization current of superconducting cables is low, which affects the insulation aging detection results of superconducting cables. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present disclosure proposes a method and device for detecting insulation aging of a superconducting cable based on polarization current.

[0005] According to one aspect of an embodiment of the present disclosure, a method for detecting aging of superconducting cable insulation based on polarization current is provided, which is applied to an aging detection device, wherein the aging detection device includes a power supply and a pre-charge capacitor; the method includes:

[0006] Obtaining main insulator capacitance data and preset polarization voltage corresponding to the target superconducting cable;

[0007] Based on the preset polarization voltage, determining a target pre-charge voltage;

[0008] Based on the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage, performing capacitance analysis on the pre-charge capacitor to obtain target capacitance data corresponding to the pre-charge capacitor;

[0009] Based on the target capacitance data, the pre-charge capacitor is subjected to capacitance adjustment processing to obtain an adjusted pre-charge capacitor;

[0010] Performing a charging operation on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to the target pre-charge voltage;

[0011] Based on the power supply, the preset polarization voltage and the adjusted pre-charge capacitance, performing a preset polarization detection operation on the target superconducting cable so that a target polarization current flows through the main insulation of the target superconducting cable, and obtaining the target polarization current;

[0012] Based on the target polarization current, an insulation aging test is performed on the target superconducting cable to obtain an insulation aging test result corresponding to the target superconducting cable.

[0013] Optionally, determining a target pre-charge voltage based on the preset polarization voltage includes:

[0014] Based on the preset polarization voltage, determining a pre-charge voltage range;

[0015] The target pre-charge voltage is determined from the pre-charge voltage range.

[0016] Optionally, determining the pre-charge voltage range based on the preset polarization voltage includes:

[0017] Selecting two preset scaling factors from a plurality of different preset scaling factors;

[0018] Based on the preset polarization voltage and each of the two preset proportional coefficients, determining the end value of the pre-charge voltage range corresponding to each of the two preset proportional coefficients;

[0019] The pre-charge voltage range is generated based on the end value of the pre-charge voltage range.

[0020] Optionally, the aging detection device further includes a boost module; when the target pre-charge voltage is greater than the maximum output voltage corresponding to the power supply, the charging operation is performed on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to the target pre-charge voltage, including:

[0021] Based on the boost module, a charging operation is performed on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to the target pre-charge voltage.

[0022] Optionally, the performing capacitance analysis on the pre-charge capacitor based on the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage to obtain target capacitance data corresponding to the pre-charge capacitor includes:

[0023] Performing a difference analysis on the preset polarization voltage and the target pre-charge voltage to obtain voltage difference data; the voltage difference data is used to characterize the degree of difference between the preset polarization voltage and the target pre-charge voltage;

[0024] Based on the voltage difference data, the main insulator capacitance data and the preset polarization voltage, a discharge analysis is performed on the pre-charged capacitance to obtain the target capacitance data.

[0025] Optionally, after performing a preset polarization detection operation on the target superconducting cable based on the power supply, the preset polarization voltage and the adjusted pre-charge capacitance so that a target polarization current flows through the main insulation of the target superconducting cable, and obtaining the target polarization current, the method further includes:

[0026] The step of performing insulation aging detection on the target superconducting cable based on the target polarization current to obtain an insulation aging detection result corresponding to the target superconducting cable includes:

[0027] According to another aspect of the embodiment of the present disclosure, a superconducting cable insulation aging detection device based on polarization current is provided, which is arranged in an aging detection device, wherein the aging detection device includes a power supply and a precharge capacitor; the superconducting cable insulation aging detection device based on polarization current includes:

[0028] A data acquisition module, used to acquire the main insulator capacitance data and preset polarization voltage corresponding to the target superconducting cable;

[0029] A voltage determination module, used to determine a target pre-charge voltage based on the preset polarization voltage;

[0030] A capacitance analysis module, configured to perform capacitance analysis on the pre-charge capacitor based on the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage, to obtain target capacitance data corresponding to the pre-charge capacitor;

[0031] A capacitance adjustment module, configured to perform capacitance adjustment processing on the pre-charge capacitor based on the target capacitance data to obtain an adjusted pre-charge capacitor;

[0032] A first execution module, configured to perform a charging operation on the adjusted pre-charge capacitor, so that the adjusted pre-charge capacitor is charged to the target pre-charge voltage;

[0033] A second execution module is used to perform a preset polarization detection operation on the target superconducting cable based on the power supply, the preset polarization voltage and the adjusted pre-charge capacitance, so that a target polarization current flows through the main insulation of the target superconducting cable, and obtain the target polarization current;

[0034] The insulation aging detection module is used to perform insulation aging detection on the target superconducting cable based on the target polarization current to obtain an insulation aging detection result corresponding to the target superconducting cable.

[0035] According to another aspect of an embodiment of the present disclosure, there is provided an electronic device, comprising: a processor; and a memory for storing a computer program; wherein the processor is configured to execute the computer program to implement the above-mentioned superconducting cable insulation aging detection method based on polarization current.

[0036] According to another aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided. When a computer program in the storage medium is executed by a processor of an electronic device, the electronic device is enabled to perform the above-mentioned superconducting cable insulation aging detection method based on polarization current.

[0037] According to another aspect of an embodiment of the present disclosure, a computer program product including a computer program is provided, which, when executed on a computer, enables the computer to execute the above-mentioned method for detecting insulation aging of a superconducting cable based on polarization current.

[0038] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0039] By acquiring the main insulator capacitance data and preset polarization voltage corresponding to the target superconducting cable, and determining the target pre-charge voltage based on the preset polarization voltage, the target pre-charge voltage of the pre-charge capacitor can be analyzed and determined. Then, in combination with the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage, the pre-charge capacitor is subjected to capacitance analysis to obtain the target capacitance data corresponding to the pre-charge capacitor, so as to achieve fast and accurate capacitance analysis of the pre-charge capacitor. Then, in combination with the target capacitance data, the pre-charge capacitor is subjected to capacitance adjustment processing to obtain the adjusted pre-charge capacitor, so as to achieve capacitance adjustment of the pre-charge capacitor. In combination with the setting of the target pre-charge voltage, the voltage required to be output by the power supply can be reduced as much as possible while avoiding the situation where the polarization current is too small and affects the measurement accuracy, so as to achieve the desired capacitance. The cost caused by the increase of the output voltage level is reduced, and then, a charging operation is performed on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to the target pre-charge voltage. Based on the power supply, the preset polarization voltage and the adjusted pre-charge capacitor, a preset polarization detection operation is performed on the target superconducting cable so that the main insulation of the target superconducting cable flows through the target polarization current and the target polarization current is obtained. The above-mentioned pre-charge capacitor can replace the power supply to charge the body capacitance of the main insulation of the target cable, and the body capacitance can be quickly charged to the preset measurement voltage, thereby reducing the influence of the body capacitance charging current. Combined with the target polarization current, the target superconducting cable is subjected to insulation aging detection, and the insulation aging detection result corresponding to the target superconducting cable is obtained, which can improve the accuracy of insulation aging detection of the superconducting cable.

[0040] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description are used to explain the principles of the present disclosure, and do not constitute improper limitations on the present disclosure.

[0042] Figure 1 is a schematic structural diagram of an aging detection unit in an aging detection device according to an exemplary embodiment;

[0043] Figure 2 is a flow chart showing a method for detecting insulation aging of a superconducting cable based on polarization current according to an exemplary embodiment;

[0044] Figure 3 is a structural schematic diagram of an aging detection unit in an aging detection device including a boost module according to an exemplary embodiment;

[0045] Figure 4is a schematic diagram of an aging detection unit in an aging detection device according to an exemplary embodiment;

[0046] Figure 5 is a block diagram of a superconducting cable insulation aging detection device based on polarization current according to an exemplary embodiment;

[0047] Figure 6 is a block diagram of an electronic device for performing insulation aging detection on a superconducting cable according to an exemplary embodiment;

[0048] Figure 7 It is a block diagram of another electronic device for performing insulation aging detection on a superconducting cable according to an exemplary embodiment. DETAILED DESCRIPTION

[0049] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0050] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0051] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0052] See also Figure 1 , Figure 1 is a schematic diagram of the structure of an aging detection unit in an aging detection device according to an exemplary embodiment. Specifically, the aging detection device may include an aging detection unit, a control unit, and a data processing unit, such as Figure 1As shown, the aging detection unit may include a power supply, a pre-charge capacitor and two cable detection terminals. The power supply may be used to supply power during the polarization process of the target superconducting cable. The power supply may include a DC high voltage source. The pre-charge capacitor may be used to charge the main insulator capacitance of the target superconducting cable during the polarization process. The above two cable detection terminals may be used to connect to both ends of the main insulation of the target superconducting cable. The aging detection device may be used to implement insulation aging detection of the target superconducting cable. The target superconducting cable may refer to a superconducting cable whose insulation aging degree needs to be detected. Further, the target capacitance data may be obtained by performing capacitance analysis based on the data processing unit; the charging operation and the preset polarization detection operation may be performed based on the control unit; the insulation aging detection may be performed on the target superconducting cable based on the target polarization current obtained by the data processing unit and the current acquisition module to obtain the insulation aging detection result.

[0053] See also Figure 2 , Figure 2 FIG. 1 is a flow chart showing a method for detecting insulation aging of a superconducting cable based on polarization current according to an exemplary embodiment. Figure 2 As shown, the superconducting cable insulation aging detection method based on polarization current can be applied to aging detection equipment, and specifically may include the following steps:

[0054] S201: Obtaining main insulator capacitance data and preset polarization voltage corresponding to a target superconducting cable.

[0055] In a specific embodiment, the main insulator capacitance data corresponding to the target superconducting cable can be used to characterize the capacitance of the main insulator capacitance of the target superconducting cable. Specifically, the above-mentioned aging detection device can also include a body capacitance measurement module; further, based on the body capacitance measurement module, the body capacitance of the main insulation of the target superconducting cable can be measured to obtain the above-mentioned main insulator capacitance data.

[0056] In a specific embodiment, the preset polarization voltage may refer to the voltage required to be applied to the target superconducting cable during the polarization process. Specifically, the preset polarization voltage may be set according to actual application needs, and the present disclosure does not limit this. It is understandable that the preset polarization voltage may be set by the cable tester according to actual measurement needs.

[0057] S203: Determine a target pre-charge voltage based on a preset polarization voltage.

[0058] In a specific embodiment, the target pre-charge voltage may refer to the voltage that the pre-charge capacitor needs to be pre-charged. Specifically, the target pre-charge voltage may be greater than the preset polarization voltage.

[0059] In a specific embodiment, the above step S203 may include:

[0060] Based on the preset polarization voltage, determining a pre-charge voltage range;

[0061] From the pre-charge voltage range, determine the target pre-charge voltage.

[0062] In a specific embodiment, the pre-charge voltage range may refer to a range of pre-charge voltages that can be set as pre-charge capacitors. The pre-charge voltage range may include a maximum end value of the range and a minimum end value of the range.

[0063] In a specific embodiment, determining the pre-charge voltage range based on the preset polarization voltage may include:

[0064] Selecting two preset scaling factors from a plurality of different preset scaling factors;

[0065] Based on the preset polarization voltage and each of the two preset proportional coefficients, determining the end value of the pre-charge voltage range corresponding to each of the two preset proportional coefficients;

[0066] A pre-charge voltage range is generated based on the pre-charge voltage range end value.

[0067] In a specific embodiment, a plurality of different preset proportional coefficients can be used to generate the pre-charge voltage range. Specifically, the preset proportional coefficient can be set according to actual application needs. Optionally, the value range of the preset proportional coefficient can include 1.5 to 2.

[0068] In a specific embodiment, any two preset proportional coefficients may be randomly selected from the above-mentioned multiple different preset proportional coefficients.

[0069] In a specific embodiment, the preset polarization voltage may be multiplied by each preset proportional coefficient to obtain the end value of the pre-charge voltage range corresponding to each preset proportional coefficient.

[0070] In a specific embodiment, the smaller value among the above-mentioned pre-charge voltage range end values ​​can be used as the maximum end value of the pre-charge voltage range; the larger value among the above-mentioned pre-charge voltage range end values ​​can be used as the minimum end value of the pre-charge voltage range; accordingly, the above-mentioned pre-charge voltage range can be generated.

[0071] In a specific embodiment, any value can be randomly selected from the above pre-charge voltage range as the target pre-charge voltage.

[0072] In a specific embodiment, the target pre-charge voltage can be determined based on the pre-charge voltage range and the maximum output voltage of the power supply. Specifically, a voltage value within the pre-charge voltage range and lower than the maximum output voltage of the power supply can be used as the target pre-charge voltage.

[0073] S205: Based on the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage, a capacitance analysis is performed on the pre-charge capacitor to obtain target capacitance data corresponding to the pre-charge capacitor.

[0074] In a specific embodiment, the target capacitance data corresponding to the pre-charge capacitor can be used to represent the capacitance to which the pre-charge capacitor needs to be adjusted.

[0075] In a specific embodiment, the above step S205 may include:

[0076] Performing difference analysis on the preset polarization voltage and the target pre-charge voltage to obtain voltage difference data;

[0077] Based on the voltage difference data, the main insulator capacitance data and the preset polarization voltage, the pre-charged capacitance is discharged and analyzed to obtain the target capacitance data.

[0078] In a specific embodiment, the voltage difference data may be used to characterize the degree of difference between a preset polarization voltage and a target pre-charge voltage.

[0079] In a specific embodiment, the voltage difference data may be obtained by subtracting the preset polarization voltage from the target pre-charge voltage.

[0080] In a specific embodiment, the target capacitance data can be obtained by the following formula:

[0081]

[0082] Where C1 is the target capacitance data; C m0 The main insulator capacitance data; U m is the preset polarization voltage; ΔU is the voltage difference data.

[0083] S207: Based on the target capacitance data, the pre-charge capacitor is subjected to capacitance adjustment processing to obtain an adjusted pre-charge capacitor.

[0084] In a specific embodiment, the adjusted pre-charge capacitor may refer to a pre-charge capacitor adjusted to a capacitance corresponding to the target capacitance data. It is understandable that the capacitance of the pre-charge capacitor before and after the adjustment may be different.

[0085] In a specific embodiment, the electrode plate spacing analysis of the pre-charged capacitor can be performed based on the target capacitance data to obtain the electrode plate spacing data corresponding to the pre-charged capacitor; wherein the electrode plate spacing data can represent the distance between two electrode plates in the capacitor to be adjusted. Then, based on the electrode plate spacing data, the electrode plates of the pre-charged capacitor can be adjusted so that the capacitance of the pre-charged capacitor is adjusted to the capacitance corresponding to the target capacitance data.

[0086] In a specific embodiment, when the pre-charge capacitor is an electronic capacitor, an adjustment instruction carrying the target capacitance data may be sent to the pre-charge capacitor so that the capacitance of the pre-charge capacitor is adjusted to the capacitance corresponding to the target capacitance data.

[0087] In the above embodiment, the pre-charge capacitor is subjected to capacitance analysis through the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage, and the target capacitance data corresponding to the pre-charge capacitor is obtained. The pre-charge capacitor is subjected to capacitance adjustment processing in combination with the target capacitance data to obtain the adjusted pre-charge capacitor, which can reduce the voltage required to be output by the power supply as much as possible while avoiding the polarization current being too small and affecting the measurement accuracy, thereby reducing the cost caused by the increase in the output voltage level as much as possible. It is understandable that when the target pre-charge voltage is greater than the preset polarization voltage, since the preset polarization voltage may be set relatively large for the superconducting cable, the target pre-charge voltage may cause the voltage value required to be provided by the power supply to be relatively large, thereby causing a corresponding increase in various costs such as voltage output cost and insulation cost.

[0088] S209: Perform a charging operation on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to a target pre-charge voltage.

[0089] In a specific embodiment, the aging detection device may also include a pre-charge control switch and a pre-charge current limiting resistor. Among them, the pre-charge current limiting resistor can be used to limit the current during the pre-charge process. Specifically, the first output end of the power supply can be connected to one end of the above-mentioned pre-charge control switch; the other end of the above-mentioned pre-charge control switch can be connected to one end of the pre-charge current limiting resistor; the other end of the above-mentioned pre-charge current limiting resistor can be connected to one end of the pre-charge capacitor; the other end of the above-mentioned pre-charge capacitor can be connected to the second output end of the power supply.

[0090] In a specific embodiment, the output voltage of the power supply can be controlled to be adjusted to a target pre-charge voltage; when the output voltage of the power supply is the target pre-charge voltage, the pre-charge control switch can be controlled to close for a preset time so that the power supply charges the pre-charge capacitor and charges the voltage of the pre-charge capacitor to the target pre-charge voltage.

[0091] In a specific embodiment, the voltage across the pre-charge capacitor can be measured; when it is detected that the voltage across the pre-charge capacitor is equal to the target pre-charge voltage, it can be determined that the pre-charge of the pre-charge capacitor is completed.

[0092] In a specific embodiment, the aging detection device may further include a boost module, which may be used to boost the output voltage of the power supply.

[0093] In a specific embodiment, when the target pre-charge voltage is greater than the maximum output voltage corresponding to the power supply, the above-mentioned charging operation is performed on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to the target pre-charge voltage, which may include:

[0094] Based on the boost module, a charging operation is performed on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to a target pre-charge voltage.

[0095] In a specific embodiment, the input end of the boost module may be connected to the output end of the power supply, and the output end of the boost module may be connected to both ends of the pre-charge capacitor.

[0096] In a specific embodiment, when the target pre-charge voltage is greater than the maximum output voltage corresponding to the power supply, the output voltage of the power supply can be boosted to the target pre-charge voltage through a boost module. Correspondingly, when the output voltage of the power supply is the target pre-charge voltage, the pre-charge control switch can be controlled to preset a time length so that the power supply charges the pre-charge capacitor and charges the voltage of the pre-charge capacitor to the target pre-charge voltage.

[0097] In a specific embodiment, Figure 3 FIG. 1 is a schematic diagram showing a structure of an aging detection unit in an aging detection device including a boost module according to an exemplary embodiment. Specifically, Figure 3 As shown, the aging detection device may further include a first output switching switch K4 and a second output switching switch K5, and the power supply may further include a third output end, the first output end may be connected to one end of the first output switching switch, and the other end of the first output switching switch may be connected to the pre-charge capacitor; the third output end may be connected to one end of the second output switching switch, and the other end of the second output switching switch may be connected to an input end of the boost module; further, when the target pre-charge voltage is greater than the maximum output voltage corresponding to the power supply, the second output switching switch K5 may be closed and the first output switching switch K4 may be disconnected, so that the power supply can be boosted through the boost module to supply power to the pre-charge capacitor; when the target pre-charge voltage is less than or equal to the maximum output voltage corresponding to the power supply, the second output switching switch K5 may be disconnected and the first output switching switch K4 may be closed, so that the power supply can directly supply power to the pre-charge capacitor.

[0098] S211: Based on the power supply, the preset polarization voltage and the adjusted pre-charged capacitance, a preset polarization detection operation is performed on the target superconducting cable, so that a target polarization current flows through the main insulation of the target superconducting cable, and the target polarization current is obtained.

[0099] In a specific embodiment, the aging detection device may further include a polarization control switch and a polarization current limiting resistor. Specifically, one end of the polarization control switch may be connected to the first output end of the power supply; the other end of the polarization control switch may be connected to one end of the polarization current limiting resistor; the other end of the polarization current limiting resistor may be connected to one of the cable detection terminals; and the other cable detection terminal may be connected to the second output end of the power supply.

[0100] In a specific embodiment, the output voltage of the power supply can be controlled to be adjusted to a preset polarization voltage; when the output voltage of the power supply is the preset polarization voltage, the polarization control switch can be controlled to close so that the power supply and the pre-charge capacitor discharge toward the main insulation of the target superconducting cable.

[0101] In the above embodiment, based on the power supply, the preset polarization voltage and the adjusted pre-charge capacitor, a preset polarization detection operation is performed on the target superconducting cable, so that during the discharge of the power supply and the pre-charge capacitor to the main insulation of the target superconducting cable, the pre-charge capacitor can quickly charge the body capacitance of the target superconducting cable to the preset polarization voltage, thereby reducing the impact of the body capacitance charging current.

[0102] In a specific embodiment, the aging detection device may further include a current acquisition module. The current acquisition module may be used to acquire the current flowing through the target superconducting main insulation. Specifically, the current acquisition module may be connected to a loop for acquisition, or may be used to acquire the current through a current sensor.

[0103] In a specific embodiment, when it is detected that the polarization control switch is closed, the current acquisition module can be controlled to start acquiring the current flowing through the main insulation of the target superconducting cable, and accordingly, the acquired current can be used as the target polarization current.

[0104] In a specific embodiment, the aging detection device may further include a protection diode. The protection diode may be disposed between the pre-charge control switch and the first output terminal of the power supply; the anode of the protection diode may be connected to the first output terminal of the power supply; and the cathode of the protection diode may be connected to one end of the pre-charge control switch. It is understandable that the protection diode may prevent the reverse charging of the power supply during the charging process of the pre-charge capacitor to the body capacitor.

[0105] S213: Based on the target polarization current, perform insulation aging detection on the target superconducting cable to obtain an insulation aging detection result corresponding to the target superconducting cable.

[0106] In a specific embodiment, the insulation aging detection result corresponding to the target superconducting cable can be used to characterize the insulation aging condition of the target superconducting cable.

[0107] In a specific embodiment, an insulation characteristic analysis may be performed on a target superconducting cable based on a target polarization current to obtain insulation characteristic information corresponding to the target superconducting cable; correspondingly, an aging analysis may be performed on the target superconducting cable based on the insulation characteristic information corresponding to the target superconducting cable to obtain an insulation aging detection result corresponding to the target superconducting cable.

[0108] In a specific embodiment, after performing a preset polarization detection operation on a target superconducting cable based on the power supply, the preset polarization voltage and the adjusted pre-charge capacitance so that a target polarization current flows through the main insulation of the target superconducting cable and the target polarization current is obtained, the method may further include:

[0109] A preset depolarization operation is performed on the target superconducting cable to release the charge of the main insulation of the target superconducting cable and avoid safety hazards caused by residual high voltage.

[0110] Accordingly, the insulation aging test of the target superconducting cable based on the target polarization current to obtain the insulation aging test result corresponding to the target superconducting cable may include:

[0111] In a specific embodiment, the aging detection device may further include a depolarization control switch. Specifically, one end of the depolarization control switch may be connected to the other end of the polarization control switch; and the other end of the depolarization control switch may be connected to the second output end of the power supply.

[0112] In a specific embodiment, when the polarization measurement end instruction is detected, the polarization control switch can be controlled to be disconnected, and the depolarization control switch can be controlled to be closed, so that the main insulation of the target superconducting cable releases the charge to avoid the safety hazard caused by the residual high voltage. Specifically, when the polarization control switch is controlled to be disconnected, the output voltage of the power supply can be controlled to be adjusted to 0. The polarization measurement end instruction can be used to indicate that the insulation polarization process of the target superconducting cable has been completed.

[0113] In a specific embodiment, when the depolarization measurement end instruction is detected, the polarization control switch and the depolarization control switch can be controlled to close for a preset time to discharge the pre-charge capacitor, thereby avoiding the safety hazard caused by the high voltage of the pre-charge capacitor. The depolarization measurement end instruction can be used to indicate that the insulation depolarization process of the target superconducting cable has been completed.

[0114] In a specific embodiment, the insulation characteristic analysis of the target superconducting cable can be performed based on the target polarization current to obtain the insulation characteristic information corresponding to the target superconducting cable. Correspondingly, based on the insulation characteristic information corresponding to the target superconducting cable, the aging analysis of the target superconducting cable can be performed to obtain the insulation aging detection result corresponding to the target superconducting cable.

[0115] In the above embodiment, by obtaining the main insulator capacitance data and the preset polarization voltage corresponding to the target superconducting cable, and determining the target pre-charge voltage based on the preset polarization voltage, the target pre-charge voltage of the pre-charge capacitor can be analyzed and determined, and then the pre-charge capacitor is subjected to capacitance analysis in combination with the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage to obtain the target capacitance data corresponding to the pre-charge capacitor, so as to achieve fast and accurate capacitance analysis of the pre-charge capacitor. Then, in combination with the target capacitance data, the pre-charge capacitor is subjected to capacitance adjustment processing to obtain the adjusted pre-charge capacitor, so as to achieve capacitance adjustment of the pre-charge capacitor. In combination with the setting of the target pre-charge voltage, the voltage required to be output by the power supply can be reduced as much as possible while avoiding the situation where the polarization current is too small and affects the measurement accuracy, so as to achieve the desired capacitance. In order to minimize the cost caused by the increase in the output voltage level, a charging operation is then performed on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to a target pre-charge voltage. Based on the power supply, the preset polarization voltage and the adjusted pre-charge capacitor, a preset polarization detection operation is performed on the target superconducting cable so that the target polarization current flows through the main insulation of the target superconducting cable and the target polarization current is obtained. The above-mentioned pre-charge capacitor can replace the power supply to charge the body capacitance of the main insulation of the target cable, and the body capacitance can be quickly charged to a preset measurement voltage, thereby reducing the influence of the body capacitance charging current. Combined with the target polarization current, the target superconducting cable is subjected to insulation aging detection, and the insulation aging detection result corresponding to the target superconducting cable is obtained, which can improve the accuracy of insulation aging detection of the superconducting cable.

[0116] Figure 4 FIG. 1 is a schematic diagram of an aging detection unit in an aging detection device according to an exemplary embodiment. Specifically, the aging detection device may include an aging detection unit, a control unit, and a data processing unit; Figure 4As shown, the aging detection unit may include a power supply, a pre-charge capacitor C1, a pre-charge control switch K1, a pre-charge current limiting resistor R1, a polarization control switch K2, a depolarization control switch K3, a polarization current limiting resistor R2 and a current acquisition module. Based on the above control unit and the above data processing unit, the following steps can be implemented: the main insulator capacitance data and the preset polarization voltage corresponding to the target superconducting cable can be obtained; the target pre-charge voltage can be determined based on the preset polarization voltage; the pre-charge capacitor can be subjected to capacitance analysis based on the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage to obtain the target capacitance data corresponding to the pre-charge capacitor; the pre-charge capacitor can be subjected to capacitance adjustment processing based on the target capacitance data to obtain the adjusted pre-charge capacitor; the output voltage of the power supply can be controlled to be adjusted to the target pre-charge voltage; when the output voltage of the power supply is the target pre-charge voltage, the pre-charge control switch K1 can be controlled to be closed for a preset time so that the power supply The source charges the pre-charge capacitor and charges the voltage of the pre-charge capacitor to a target pre-charge voltage; the output voltage of the power supply can be controlled to be adjusted to a preset polarization voltage; when the output voltage of the power supply is the preset polarization voltage, the polarization control switch can be controlled to be closed, so that the power supply and the pre-charge capacitor discharge to the main insulation of the target superconducting cable, and the target polarization current is collected through the current collection module; when the polarization measurement end instruction is detected, the polarization control switch can be controlled to be opened, and the depolarization control switch can be controlled to be closed, so that the main insulation of the target superconducting cable releases the charge; based on the target polarization current, the insulation aging detection of the target superconducting cable can be performed, and the insulation aging detection result corresponding to the target superconducting cable can be obtained.

[0117] Figure 5 is a block diagram of a superconducting cable insulation aging detection device based on polarization current according to an exemplary embodiment. Specifically, the superconducting cable insulation aging detection device based on polarization current can be set in an aging detection device, such as Figure 5 As shown, the superconducting cable insulation aging detection device based on polarization current may include:

[0118] The data acquisition module 510 may be used to acquire the main insulator capacitance data and the preset polarization voltage corresponding to the target superconducting cable;

[0119] The voltage determination module 520 may be used to determine a target pre-charge voltage based on a preset polarization voltage;

[0120] The capacitance analysis module 530 may be used to perform capacitance analysis on the pre-charge capacitor based on the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage to obtain target capacitance data corresponding to the pre-charge capacitor;

[0121] The capacitance adjustment module 540 may be used to adjust the capacitance of the pre-charge capacitor based on the target capacitance data to obtain an adjusted pre-charge capacitor;

[0122] The first execution module 550 may be used to perform a charging operation on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to a target pre-charge voltage;

[0123] The second execution module 560 may be used to perform a preset polarization detection operation on the target superconducting cable based on the power supply, the preset polarization voltage and the adjusted pre-charge capacitance, so that the main insulation of the target superconducting cable flows through the target polarization current, and obtain the target polarization current;

[0124] The insulation aging detection module 570 may be used to perform insulation aging detection on a target superconducting cable based on a target polarization current, and obtain an insulation aging detection result corresponding to the target superconducting cable.

[0125] In a specific embodiment, the voltage determination module 520 may include:

[0126] A voltage range determination module, which can be used to determine a pre-charge voltage range based on a preset polarization voltage;

[0127] The pre-charge voltage determination module can be used to determine a target pre-charge voltage from a pre-charge voltage range.

[0128] In a specific embodiment, the voltage range determination module may include:

[0129] The preset coefficient determination module can be used to select two preset proportional coefficients from a plurality of different preset proportional coefficients;

[0130] A range end value determination module, which can be used to determine the pre-charge voltage range end value corresponding to each of the two preset proportional coefficients based on the preset polarization voltage and each of the two preset proportional coefficients;

[0131] The pre-charge range generation module can be used to generate a pre-charge voltage range based on the pre-charge voltage range end value.

[0132] In a specific embodiment, the first execution module 550 may include:

[0133] The third execution module can be used to perform a charging operation on the adjusted pre-charge capacitor based on the boost module, so that the adjusted pre-charge capacitor is charged to a target pre-charge voltage.

[0134] In a specific embodiment, the capacitance analysis module 530 may include:

[0135] The difference analysis module can be used to perform a difference analysis on the preset polarization voltage and the target pre-charge voltage to obtain voltage difference data; the voltage difference data is used to characterize the degree of difference between the preset polarization voltage and the target pre-charge voltage;

[0136] The discharge analysis module can be used to perform discharge analysis on the pre-charged capacitor based on the voltage difference data, the main insulator capacitance data and the preset polarization voltage to obtain the target capacitance data.

[0137] In a specific embodiment, the above device may further include:

[0138] A fourth execution module may be used to perform a preset depolarization detection operation on the target superconducting cable so as to release the charge from the main insulation of the target superconducting cable;

[0139] Accordingly, the insulation aging detection module 570 may include:

[0140] The target aging detection module can be used to perform insulation aging detection on the target superconducting cable based on the target polarization current to obtain the insulation aging detection result corresponding to the target superconducting cable.

[0141] Regarding the device in the above embodiment, the specific manner in which each module and unit performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0142] Figure 6 is a block diagram of an electronic device for performing insulation aging detection on a superconducting cable according to an exemplary embodiment. The electronic device may be a server, and its internal structure diagram may be as shown in FIG. Figure 6 As shown. The electronic device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the electronic device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a superconducting cable insulation aging detection method based on polarization current is implemented.

[0143] Figure 7 is a block diagram of another electronic device for performing insulation aging detection on a superconducting cable according to an exemplary embodiment. The electronic device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 7As shown. The electronic device includes a processor, a memory, a network interface, a display screen and an input device connected through a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the electronic device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a superconducting cable insulation aging detection method based on polarization current is implemented. The display screen of the electronic device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic device can be a touch layer covering the display screen, or a key, trackball or touchpad set on the housing of the electronic device, or an external keyboard, touchpad or mouse, etc.

[0144] Those skilled in the art will understand that Figure 6 or Figure 7 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present disclosure, and does not constitute a limitation on the electronic device to which the scheme of the present disclosure is applied. The specific electronic device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0145] In an exemplary embodiment, an electronic device is also provided, comprising: a processor; and a memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement a superconducting cable insulation aging detection method based on polarization current as in an embodiment of the present disclosure.

[0146] In an exemplary embodiment, a computer-readable storage medium is also provided. When the instructions in the storage medium are executed by a processor of an electronic device, the electronic device can execute the superconducting cable insulation aging detection method based on polarization current in the embodiment of the present disclosure.

[0147] In an exemplary embodiment, a computer program product containing instructions is also provided. When the computer program product is run on a computer, the computer is caused to execute the method for detecting insulation aging of a superconducting cable based on polarization current in the embodiment of the present disclosure.

[0148] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0149] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0150] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for detecting superconducting cable insulation aging based on polarization current, characterized in that: Applied to an aging detection device, the aging detection device includes a power supply and a pre-charge capacitor; the method includes: Obtaining main insulator capacitance data and preset polarization voltage corresponding to the target superconducting cable; Based on the preset polarization voltage, determining a target pre-charge voltage; Based on the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage, performing capacitance analysis on the pre-charge capacitor to obtain target capacitance data corresponding to the pre-charge capacitor; Based on the target capacitance data, the pre-charge capacitor is subjected to capacitance adjustment processing to obtain an adjusted pre-charge capacitor; Performing a charging operation on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to the target pre-charge voltage; Based on the power supply, the preset polarization voltage and the adjusted pre-charge capacitance, performing a preset polarization detection operation on the target superconducting cable so that a target polarization current flows through the main insulation of the target superconducting cable, and obtaining the target polarization current; Based on the target polarization current, an insulation aging test is performed on the target superconducting cable to obtain an insulation aging test result corresponding to the target superconducting cable.

2. The method according to claim 1, characterized in that: The step of determining a target pre-charge voltage based on the preset polarization voltage includes: Based on the preset polarization voltage, determining a pre-charge voltage range; The target pre-charge voltage is determined from the pre-charge voltage range.

3. The method according to claim 2, characterized in that The step of determining a pre-charge voltage range based on the preset polarization voltage includes: Selecting two preset scaling factors from a plurality of different preset scaling factors; Based on the preset polarization voltage and each of the two preset proportional coefficients, determining the end value of the pre-charge voltage range corresponding to each of the two preset proportional coefficients; The pre-charge voltage range is generated based on the end value of the pre-charge voltage range.

4. The method according to claim 1, characterized in that: The aging detection device further includes a boost module; when the target pre-charge voltage is greater than the maximum output voltage corresponding to the power supply, the charging operation is performed on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to the target pre-charge voltage, including: Based on the boost module, a charging operation is performed on the adjusted pre-charge capacitor so that the adjusted pre-charge capacitor is charged to the target pre-charge voltage.

5. The method according to claim 1, characterized in that The performing capacitance analysis on the pre-charge capacitor based on the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage to obtain the target capacitance data corresponding to the pre-charge capacitor includes: Performing a difference analysis on the preset polarization voltage and the target pre-charge voltage to obtain voltage difference data; the voltage difference data is used to characterize the degree of difference between the preset polarization voltage and the target pre-charge voltage; Based on the voltage difference data, the main insulator capacitance data and the preset polarization voltage, a discharge analysis is performed on the pre-charged capacitance to obtain the target capacitance data.

6. A superconducting cable insulation aging detection device based on polarization current, characterized in that: The device is provided in an aging detection device, wherein the aging detection device includes a power supply and a pre-charge capacitor; the superconducting cable insulation aging detection device based on polarization current includes: A data acquisition module, used to acquire the main insulator capacitance data and preset polarization voltage corresponding to the target superconducting cable; A voltage determination module, used to determine a target pre-charge voltage based on the preset polarization voltage; A capacitance analysis module, configured to perform capacitance analysis on the pre-charge capacitor based on the target pre-charge voltage, the main insulator capacitance data and the preset polarization voltage, to obtain target capacitance data corresponding to the pre-charge capacitor; A capacitance adjustment module, configured to perform capacitance adjustment processing on the pre-charge capacitor based on the target capacitance data to obtain an adjusted pre-charge capacitor; A first execution module, configured to perform a charging operation on the adjusted pre-charge capacitor, so that the adjusted pre-charge capacitor is charged to the target pre-charge voltage; A second execution module is used to perform a preset polarization detection operation on the target superconducting cable based on the power supply, the preset polarization voltage and the adjusted pre-charge capacitance, so that a target polarization current flows through the main insulation of the target superconducting cable, and obtain the target polarization current; The insulation aging detection module is used to perform insulation aging detection on the target superconducting cable based on the target polarization current to obtain an insulation aging detection result corresponding to the target superconducting cable.

7. An electronic device, characterized in that: include: processor; memory for storing computer programs; The processor is configured to execute the computer program to implement the superconducting cable insulation aging detection method based on polarization current as described in any one of claims 1 to 5.

8. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for detecting insulation aging of a superconducting cable based on polarization current as claimed in any one of claims 1 to 5 is implemented.

9. A computer program product, comprising a computer program, characterized in that When the computer program is executed by an electronic device, the method for detecting insulation aging of a superconducting cable based on polarization current as claimed in any one of claims 1 to 5 is implemented.

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