A method and device for measuring polarization current of power cable

Abstract

The present disclosure is about a polarization current measurement method and device for a power cable, which can be applied to cables of various different insulating materials such as cross-linked polyethylene cables, polypropylene cables or superconducting cables. The method includes: pre-charging a pre-charge capacitor so that the voltage of the pre-charge capacitor reaches a preset pre-charge voltage; when the voltage of the pre-charge capacitor is the preset pre-charge voltage, based on a preset measurement voltage, controlling a power module and a pre-charge capacitor to discharge to the target cable main insulation, so that during the discharge of the power module, the body capacitance of the target cable main insulation is charged through the pre-charge capacitor; the preset measurement voltage is less than the preset pre-charge voltage; and the target current data flowing through the target cable main insulation during the discharge process is collected. The embodiment of the present disclosure can improve the measurement accuracy of the target current data of the target cable main insulation, thereby improving the prediction accuracy of the insulation state of the target cable.

Description

Technical Field

[0001] The present disclosure relates to the field of cable technology, and in particular to a method and device for measuring polarization current of a power cable. Background Art

[0002] Power cables are increasingly being used in urban power supply and distribution, power station lead-out lines, etc., due to their advantages of not occupying surface corridors, being less affected by climate and environment, requiring less maintenance, and being flexible to lay. During long-term operation, the cable insulation will deteriorate due to factors such as electric field, thermal field, and moisture, ultimately threatening the safe and reliable operation of the cable.

[0003] The polarization current method is a non-destructive insulation diagnostic 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 measured as the polarization current. Due to the different insulation states of the cable, the polarization current presents different characteristics, and the insulation state of the cable is judged based on these characteristics.

[0004] The length of power cables can easily be several kilometers or even dozens of kilometers, and the bulk capacitance of their main insulation can reach the microfarad level. When measuring the polarization current, the DC voltage applied to the insulation first charges the bulk capacitance. In the initial stage of measurement, the bulk capacitance charging current will be much larger than the polarization current. Only after the bulk capacitance charging current decays to a value much smaller than the polarization current can effective polarization current data be measured. Therefore, the data in the initial stage of measurement in the polarization current data obtained by the above measurement method is inaccurate, which in turn affects the prediction of the cable insulation status. Summary of the invention

[0005] In view of the above-mentioned technical problems, the present disclosure proposes a method and device for measuring polarization current of a power cable.

[0006] According to one aspect of an embodiment of the present disclosure, a method for measuring polarization current of a power cable is provided, which is applied to a target measurement device, wherein the target measurement device includes a power module and a pre-charge capacitor; the method includes:

[0007] Performing a pre-charging process on the pre-charge capacitor so that the voltage of the pre-charge capacitor reaches a preset pre-charging voltage;

[0008] In the case where the voltage of the pre-charge capacitor is the preset pre-charge voltage, based on the preset measurement voltage, the power module and the pre-charge capacitor are controlled to discharge toward the target cable main insulation, so that during the discharge of the power module, the body capacitance of the target cable main insulation is charged through the pre-charge capacitor; the power module and the pre-charge capacitor are connected in parallel, and the preset measurement voltage is less than the preset pre-charge voltage; the preset measurement voltage is the preset supply voltage corresponding to the power module during the discharge of the power module;

[0009] Target current data flowing through the main insulation of the target cable during the discharge process is collected.

[0010] Optionally, the preset pre-charge voltage includes obtaining in the following manner:

[0011] Acquire body capacitance data corresponding to the main insulation of the target cable and pre-charge capacitance data corresponding to the pre-charge capacitance;

[0012] Based on the body capacitance data, the pre-charge capacitance data and the preset measurement voltage, a charge and discharge analysis is performed on the pre-charge capacitance to obtain the preset pre-charge voltage.

[0013] Optionally, performing charge and discharge analysis on the pre-charge capacitor based on the body capacitance data, the pre-charge capacitance data and the preset measurement voltage to obtain the preset pre-charge voltage includes:

[0014] Based on the preset measurement voltage, determining a target charging voltage corresponding to the pre-charge capacitor;

[0015] Based on the target charging voltage, the bulk capacitance data and the pre-charge capacitance data, a discharge analysis is performed on the pre-charge capacitance to obtain the preset pre-charge voltage.

[0016] Optionally, the target measurement device further includes a body capacitance measurement module; and the body capacitance data is obtained by:

[0017] Based on the body capacitance measurement module, body capacitance of the target cable main insulation is measured to obtain the body capacitance data.

[0018] Optionally, the target measurement device further includes a first switch and a first resistor, one end of the first switch is connected to one end of the first resistor, the other end of the first resistor is connected to the first output end of the power module, the other end of the first switch is connected to one end of the pre-charge capacitor, and the other end of the pre-charge capacitor is connected to the second output end of the power module; the pre-charging the pre-charge capacitor so that the voltage of the pre-charge capacitor reaches a preset pre-charge voltage includes:

[0019] Controlling the output voltage of the power module to be adjusted to the preset pre-charge voltage;

[0020] When the output voltage of the power module is the preset pre-charge voltage, the first switch is controlled to close for a preset time so that the power module pre-charges the pre-charge capacitor and charges the voltage of the pre-charge capacitor to the preset pre-charge voltage.

[0021] Optionally, the target measurement device further includes a preset diode, which is disposed between the first switch and the first resistor, an anode of the preset diode is connected to one end of the first resistor, and a cathode of the preset diode is connected to one end of the first switch.

[0022] Optionally, the target measurement device further includes a first terminal, a second terminal, a second switch and a second resistor, one end of the second switch is connected to one end of the pre-charge capacitor, the other end of the second switch is connected to one end of the second resistor, the other end of the second resistor is connected to the first terminal, the other end of the pre-charge capacitor is connected to the second terminal, and the first terminal and the second terminal are used to be respectively connected to two ends of the target cable main insulation; the method of controlling the power module and the pre-charge capacitor to discharge to the target cable main insulation based on the preset measurement voltage includes:

[0023] Controlling the output voltage of the power module to be adjusted to the preset measurement voltage;

[0024] When the output voltage of the power module is the preset measurement voltage, the second switch is controlled to be closed so that the power module and the pre-charge capacitor discharge toward the main insulation of the target cable.

[0025] Optionally, the target measurement device further includes a current acquisition module, which is disposed between the second resistor and the first terminal, wherein a first input terminal of the current acquisition module is connected to the other end of the second resistor, and a second input terminal of the current acquisition module is connected to the first terminal; the target current data flowing through the main insulation of the target cable during the discharge process is acquired, including:

[0026] Based on the current acquisition module, the target current data is acquired.

[0027] According to another aspect of an embodiment of the present disclosure, a polarization current measuring device for a power cable is provided, which is arranged in a target measuring device, wherein the target measuring device comprises a power module and a pre-charge capacitor; the polarization current measuring device for a power cable comprises:

[0028] A pre-charge processing module, used for performing a pre-charge processing on the pre-charge capacitor so that the voltage of the pre-charge capacitor reaches a preset pre-charge voltage;

[0029] A first execution module is used to control the power module and the pre-charge capacitor to discharge toward the target cable main insulation based on a preset measurement voltage when the voltage of the pre-charge capacitor is the preset pre-charge voltage, so that during the discharge of the power module, the body capacitance of the target cable main insulation is charged by the pre-charge capacitor; the power module and the pre-charge capacitor are connected in parallel, and the preset measurement voltage is less than the preset pre-charge voltage; the preset measurement voltage is a preset supply voltage corresponding to the power module during the discharge of the power module;

[0030] The second execution module is used to collect target current data flowing through the main insulation of the target cable during the discharge process.

[0031] 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 method for measuring polarization current of a power cable.

[0032] 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 method for measuring polarization current of a power cable.

[0033] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0034] By pre-charging the pre-charge capacitor so that the voltage of the pre-charge capacitor reaches a preset pre-charge voltage, the pre-charge capacitor can be pre-charged before measurement. Then, when the voltage of the pre-charge capacitor is the preset pre-charge voltage, based on the preset measurement voltage, the power module and the pre-charge capacitor are controlled to discharge to the target cable main insulation, so that during the discharge of the power module, the body capacitance of the target cable main insulation is charged by the pre-charge capacitor, wherein the preset measurement voltage is less than the preset pre-charge voltage, and the pre-charge capacitor can replace the power supply to charge the body capacitance of the target cable main insulation, and the body capacitance can be quickly charged to the preset measurement voltage, thereby reducing the impact of the body capacitance charging current. Then, the target current data flowing through the target cable main insulation during the discharge process is collected, which can improve the measurement accuracy of the target current data of the target cable main insulation, thereby improving the prediction accuracy of the insulation state of the target cable.

[0035] 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

[0036] 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.

[0037] Figure 1 is a schematic structural diagram of a target measurement unit in a target measurement device according to an exemplary embodiment;

[0038] Figure 2 is a flow chart of a method for measuring polarization current of a power cable according to an exemplary embodiment;

[0039] Figure 3 is a schematic diagram of a target measurement unit in a target measurement device according to an exemplary embodiment;

[0040] Figure 4 is a comparison diagram of current measurement effects obtained by a method for measuring polarization current of a power cable according to an exemplary embodiment;

[0041] Figure 5 is a block diagram of a polarization current measuring device for a power cable according to an exemplary embodiment;

[0042] Figure 6 is a block diagram of an electronic device for collecting target current data flowing through the main insulation of a target cable according to an exemplary embodiment;

[0043] Figure 7 The invention is a block diagram of another electronic device for collecting target current data flowing through the main insulation of a target cable according to an exemplary embodiment. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] See also Figure 1 , Figure 1 FIG. 1 is a schematic diagram showing the structure of a target measurement unit in a target measurement device according to an exemplary embodiment. Specifically, the target measurement device may include a target measurement unit and a control unit; Figure 1 As shown, the target measurement unit may include a power module and a pre-charge capacitor. The power module may be used to supply power during the polarization current measurement of the target cable main insulation. The power module may include a DC high voltage source. The pre-charge capacitor may be used to charge the body capacitance of the target cable main insulation during the polarization current test. The output end of the target measurement device may be connected to both ends of the target cable main insulation. The target measurement device may be used to achieve polarization current measurement of the target cable. The target cable may include cables of various different insulating materials such as cross-linked polyethylene cable, polypropylene cable or superconducting cable. The control unit may be used to achieve acquisition of target current data by controlling the target measurement unit.

[0048] See also Figure 2 , Figure 2 FIG. 1 is a flow chart showing a method for measuring polarization current of a power cable according to an exemplary embodiment. Figure 2 As shown, the polarization current measurement method of the power cable can be applied to a target measurement device, and specifically may include the following steps:

[0049] S201: pre-charge the pre-charge capacitor so that the voltage of the pre-charge capacitor reaches a preset pre-charge voltage.

[0050] In a specific embodiment, the preset pre-charge voltage may refer to the voltage that the pre-charge capacitor needs to be pre-charged.

[0051] In a specific embodiment, the preset pre-charge voltage may be obtained by:

[0052] Obtaining body capacitance data corresponding to the main insulation of the target cable and pre-charge capacitance data corresponding to the pre-charge capacitance;

[0053] Based on the body capacitance data, the pre-charge capacitance data and the preset measurement voltage, the pre-charge capacitance is charged and discharged to obtain the preset pre-charge voltage.

[0054] In a specific embodiment, the volume capacitance data corresponding to the main insulation of the target cable can represent the volume capacitance corresponding to the main insulation of the target cable.

[0055] In a specific embodiment, the target measurement device may further include a bulk capacitance measurement module. The bulk capacitance measurement module may be used to measure the bulk capacitance of the main insulation of the target cable.

[0056] In a specific embodiment, the body capacitance data may be obtained in the following manner:

[0057] Based on the body capacitance measurement module, the body capacitance of the main insulation of the target cable is measured to obtain body capacitance data.

[0058] In a specific embodiment, the pre-charge capacitor data may represent the capacitance of the pre-charge capacitor. The pre-charge capacitor data may be pre-stored in a preset memory of the target measurement device. Specifically, the capacitance of the pre-charge capacitor may be selected according to actual application needs, and the present disclosure does not limit this.

[0059] In a specific embodiment, the pre-charge capacitance data corresponding to the pre-charge capacitance may be obtained from the preset memory.

[0060] In a specific embodiment, the above-mentioned charge and discharge analysis of the pre-charge capacitor based on the body capacitance data, the pre-charge capacitance data and the preset measurement voltage to obtain the preset pre-charge voltage may include:

[0061] Based on the preset measurement voltage, determining a target charging voltage corresponding to the pre-charge capacitor;

[0062] Based on the target charging voltage, the bulk capacitance data and the pre-charge capacitance data, the pre-charge capacitance is discharged and analyzed to obtain a preset pre-charge voltage.

[0063] In a specific embodiment, the target charging voltage corresponding to the pre-charge capacitor may refer to the voltage to which the pre-charge capacitor needs to be charged when charging the bulk capacitance of the main insulation of the target cable.

[0064] In a specific embodiment, the target charging voltage can be obtained by the following formula:

[0065] U1=KU m

[0066] Among them, U1 is the target charging voltage; U m is the preset measurement voltage; K is the preset coefficient. Specifically, the above preset coefficient can be set according to the actual application needs, and the present disclosure does not limit it. Optionally, the value range of the preset coefficient K can be 0.9 to 1. Exemplarily, the preset coefficient K can be 0.9.

[0067] In a specific embodiment, the preset pre-charge voltage can be obtained by the following formula:

[0068] U0=(C1+C m0 )U1 / C1

[0069] Among them, U1 is the target charging voltage; U0 is the preset pre-charge voltage; C1 is the pre-charge capacitance data; C m0 is the volume capacitance data.

[0070] In a specific embodiment, the target measurement device may further include a first switch and a first resistor. Specifically, one end of the first switch may be connected to one end of the first resistor. The other end of the first resistor may be connected to a first output end of the power module. The other end of the first switch may be connected to one end of a pre-charge capacitor. The other end of the pre-charge capacitor may be connected to a second output end of the power module. The first resistor may be used to limit the charging current of the pre-charge capacitor.

[0071] In a specific embodiment, the above step S201 may include:

[0072] The output voltage of the control power module is adjusted to a preset pre-charge voltage;

[0073] When the output voltage of the power module is a preset pre-charge voltage, the first switch is controlled to close for a preset time period so that the power module pre-charges the pre-charge capacitor and charges the voltage of the pre-charge capacitor to the preset pre-charge voltage.

[0074] In a specific embodiment, a first voltage adjustment instruction carrying a preset pre-charge voltage may be sent to the power module so that the power module adjusts its output voltage to the preset pre-charge voltage.

[0075] In a specific embodiment, the preset duration can be set according to actual application needs. Specifically, the preset duration can be greater than or equal to the preset charging duration. Among them, the preset charging duration can be determined based on the above-mentioned first resistor and the pre-charge capacitor. Specifically, the preset charging duration can be obtained by the following formula:

[0076] T=20R1C1

[0077] Wherein, T is the preset charging time; R1 is the resistance value of the first resistor; C1 is the pre-charge capacitance data of the pre-charge capacitor.

[0078] In a specific embodiment, when the first switch is controlled to be closed for a preset time period, it can be determined that the pre-charging of the pre-charging capacitor is completed.

[0079] 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 preset pre-charge voltage, it can be determined that the pre-charge of the pre-charge capacitor is completed.

[0080] S203: When the voltage of the pre-charge capacitor is a preset pre-charge voltage, based on a preset measurement voltage, control the power module and the pre-charge capacitor to discharge toward the target cable main insulation, so that during the discharge process of the power module, the body capacitance of the target cable main insulation is charged through the pre-charge capacitor.

[0081] In a specific embodiment, the power module and the pre-charge capacitor may be connected in parallel.

[0082] In a specific embodiment, the preset measurement voltage may refer to a preset supply voltage corresponding to the power module during the discharge process of the power module. The preset measurement voltage may be less than the preset pre-charge voltage. Specifically, the preset measurement voltage may be set according to actual application needs, and the present disclosure is not limited thereto. It is understood that the preset measurement voltage may be set by the cable tester according to actual measurement needs.

[0083] In a specific embodiment, the target measurement device may further include a first terminal, a second terminal, a second switch, and a second resistor. One end of the second switch may be connected to one end of the pre-charge capacitor. The other end of the second switch may be connected to one end of the second resistor. The other end of the second resistor may be connected to the first terminal. The other end of the pre-charge capacitor may be connected to the second terminal. The first terminal and the second terminal may be used to be connected to the two ends of the main insulation of the target cable respectively. The second resistor may be used to limit the charging current of the capacitor.

[0084] In a specific embodiment, the above-mentioned controlling the power module and the pre-charge capacitor to discharge toward the main insulation of the target cable based on the preset measurement voltage may include:

[0085] The output voltage of the control power module is adjusted to a preset measurement voltage;

[0086] When the output voltage of the power module is a preset measurement voltage, the second switch is controlled to be closed so that the power module and the pre-charge capacitor discharge toward the main insulation of the target cable.

[0087] In a specific embodiment, a second voltage adjustment instruction carrying a preset measurement voltage may be sent to the power module so that the power module adjusts its output voltage to the preset measurement voltage.

[0088] In the above embodiment, the output voltage of the power module is controlled to be adjusted to a preset measurement voltage. When the output voltage of the power module is the preset measurement voltage, the second switch is controlled to be closed so that the power module and the pre-charge capacitor discharge toward the target cable main insulation. The body capacitance of the target cable main insulation is charged by the pre-charge capacitor. The pre-charge capacitor can replace the power supply to charge the body capacitance of the target cable main insulation. The body capacitance can be quickly charged to the preset measurement voltage, thereby reducing the impact of the body capacitance charging current.

[0089] In a specific embodiment, the target measurement device may further include a preset diode. The preset diode may be arranged between the first switch and the first resistor. The anode of the preset diode may be connected to one end of the first resistor. The cathode of the preset diode may be connected to one end of the first switch.

[0090] In the above embodiment, by arranging the above preset diode between the first switch and the first resistor, it is possible to avoid the situation where the power module is reversely charged during the charging process of the pre-charge capacitor to the body capacitor.

[0091] S205: Collecting target current data flowing through the main insulation of the target cable during the discharge process.

[0092] In a specific embodiment, the target current data may refer to polarization current data flowing through the main insulation of the target cable that needs to be obtained.

[0093] In a specific embodiment, the target measurement device may further include a current acquisition module. The current acquisition module may be arranged between the second resistor and the first terminal. The first input terminal of the current acquisition module may be connected to the other end of the second resistor. The second input terminal of the current acquisition module may be connected to the first terminal.

[0094] In a specific embodiment, the above-mentioned acquisition of target current data flowing through the main insulation of the target cable during the discharge process may include:

[0095] Based on the current acquisition module, target current data is collected.

[0096] In a specific embodiment, the current acquisition module can be used to acquire the current flowing through the main insulation of the target cable.

[0097] In a specific embodiment, the output end of the current acquisition module may be connected to a data storage module, wherein the data storage module may be used to store the target current data.

[0098] In the above embodiment, by pre-charging the pre-charge capacitor so that the voltage of the pre-charge capacitor reaches a preset pre-charge voltage, the pre-charge of the pre-charge capacitor before measurement can be achieved, and then when the voltage of the pre-charge capacitor is the preset pre-charge voltage, based on the preset measurement voltage, the power module and the pre-charge capacitor are controlled to discharge to the target cable main insulation, so that during the discharge of the power module, the body capacitance of the target cable main insulation is charged by the pre-charge capacitor, wherein the preset measurement voltage is less than the preset pre-charge voltage, and the pre-charge capacitor can replace the power supply to charge the body capacitance of the target cable main insulation, and the body capacitance can be quickly charged to the preset measurement voltage, thereby reducing the impact of the body capacitance charging current, and then, the target current data flowing through the target cable main insulation during the discharge process is collected, which can improve the measurement accuracy of the target current data of the target cable main insulation, thereby improving the prediction accuracy of the insulation state of the target cable.

[0099] Figure 3 is a schematic diagram of a target measurement unit in a target measurement device according to an exemplary embodiment. Figure 4 is a comparison diagram of current measurement effects obtained by a method for measuring polarization current of a power cable according to an exemplary embodiment. Specifically, the target measurement device may include a target measurement unit and a control unit; Figure 3 As shown, the target measurement unit may include a power module, a pre-charge capacitor C1, a first switch K1, a second switch K2, a first resistor R1, a second resistor R2, a current acquisition module, a preset diode D1, a first terminal 1 and a second terminal 2. Exemplarily, based on the above target measurement device, the following steps may be implemented by the above control unit: the output voltage of the power module may be controlled to be adjusted to a preset pre-charge voltage, and when the output voltage of the power module is the preset pre-charge voltage, the first switch (such as Figure 3 The switch K1 in the embodiment is closed for a preset time length, so that the power module pre-charges the pre-charge capacitor and charges the voltage of the pre-charge capacitor to a preset pre-charge voltage; when the voltage of the pre-charge capacitor is the preset pre-charge voltage, the output voltage of the power module is controlled to be adjusted to a preset measurement voltage, and when the output voltage of the power module is the preset measurement voltage, the second switch (such as Figure 3 The switch K2 in the circuit is closed to discharge the power module and the pre-charge capacitor to the main insulation of the target cable; during the above discharge process, the target current data is collected based on the current collection module. Figure 4 As shown, the polarization current (such as Figure 4 The “improved measured current” in the figure can be closer to the actual polarization current, that is, the measurement accuracy of the target current data of the target cable main insulation can be improved.

[0100] Figure 5 is a block diagram of a polarization current measuring device for a power cable according to an exemplary embodiment. Specifically, the polarization current measuring device for a power cable can be arranged in a target measuring device, such as Figure 5 As shown, the polarization current measuring device of the power cable may include:

[0101] The pre-charge processing module 510 can be used to perform pre-charge processing on the pre-charge capacitor so that the voltage of the pre-charge capacitor reaches a preset pre-charge voltage;

[0102] The first execution module 520 can be used to control the power module and the pre-charge capacitor to discharge to the target cable main insulation based on the preset measurement voltage when the voltage of the pre-charge capacitor is the preset pre-charge voltage, so that the body capacitance of the target cable main insulation is charged by the pre-charge capacitor during the discharge of the power module; the power module and the pre-charge capacitor are connected in parallel, the preset measurement voltage is less than the preset pre-charge voltage; the preset measurement voltage is the preset supply voltage corresponding to the power module during the discharge of the power module;

[0103] The second execution module 530 may be used to collect target current data flowing through the main insulation of the target cable during the discharge process.

[0104] In a specific embodiment, the polarization current measuring device of the power cable may further include:

[0105] A data acquisition module can be used to obtain the body capacitance data corresponding to the main insulation of the target cable and the pre-charge capacitance data corresponding to the pre-charge capacitance;

[0106] The charge and discharge analysis module can be used to perform charge and discharge analysis on the pre-charge capacitor based on the body capacitance data, the pre-charge capacitance data and the preset measurement voltage to obtain the preset pre-charge voltage.

[0107] In a specific embodiment, the charge and discharge analysis module may include:

[0108] A voltage determination module, which can be used to determine a target charging voltage corresponding to the pre-charge capacitor based on a preset measured voltage;

[0109] The discharge analysis module can be used to perform discharge analysis on the pre-charge capacitor based on the target charging voltage, body capacitance data and pre-charge capacitance data to obtain a preset pre-charge voltage.

[0110] In a specific embodiment, the polarization current measuring device of the power cable may further include:

[0111] The capacitance measurement module can be used to measure the body capacitance of the main insulation of the target cable based on the body capacitance measurement module to obtain body capacitance data.

[0112] In a specific embodiment, the pre-charge processing module 510 may include:

[0113] The third execution module can be used to control the output voltage of the power module to be adjusted to a preset pre-charge voltage;

[0114] The fourth execution module can be used to control the first switch to close for a preset time when the output voltage of the power module is a preset pre-charge voltage, so that the power module pre-charges the pre-charge capacitor and charges the voltage of the pre-charge capacitor to the preset pre-charge voltage.

[0115] In a specific embodiment, the first execution module 520 may include:

[0116] A fifth execution module may be used to control the output voltage of the power supply module to be adjusted to a preset measurement voltage;

[0117] The sixth execution module can be used to control the second switch to close when the output voltage of the power module is a preset measurement voltage, so that the power module and the pre-charge capacitor discharge toward the main insulation of the target cable.

[0118] In a specific embodiment, the second execution module 530 may include:

[0119] The data acquisition module can be used to collect target current data based on the current acquisition module.

[0120] 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.

[0121] Figure 6 is a block diagram of an electronic device for collecting target current data flowing through the main insulation of a target 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 polarization current measurement method of a power cable is implemented.

[0122] Figure 7 is a block diagram of another electronic device for collecting target current data flowing through the main insulation of a target 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 7 As 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 method for measuring the polarization current of a power cable 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 covered on 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.

[0123] Those skilled in the art will understand that Figure 6 or Figure 7The 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.

[0124] 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 the polarization current measurement method of the power cable as in the embodiment of the present disclosure.

[0125] In an exemplary embodiment, a computer-readable storage medium is also provided. When instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the polarization current measurement method of a power cable in the embodiment of the present disclosure.

[0126] 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 polarization current measurement method of the power cable in the embodiment of the present disclosure.

[0127] 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).

[0128] 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.

[0129] 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 measuring polarization current of a power cable, characterized in that: Applied to a target measurement device, the target measurement device includes a power module and a pre-charge capacitor; the method includes: Performing a pre-charging process on the pre-charge capacitor so that the voltage of the pre-charge capacitor reaches a preset pre-charging voltage; In the case where the voltage of the pre-charge capacitor is the preset pre-charge voltage, based on the preset measurement voltage, the power module and the pre-charge capacitor are controlled to discharge toward the target cable main insulation, so that during the discharge of the power module, the body capacitance of the target cable main insulation is charged through the pre-charge capacitor; the power module and the pre-charge capacitor are connected in parallel, and the preset measurement voltage is less than the preset pre-charge voltage; the preset measurement voltage is the preset supply voltage corresponding to the power module during the discharge of the power module; Target current data flowing through the main insulation of the target cable during the discharge process is collected.

2. The method according to claim 1, characterized in that The preset pre-charge voltage includes obtaining in the following manner: Acquire body capacitance data corresponding to the main insulation of the target cable and pre-charge capacitance data corresponding to the pre-charge capacitance; Based on the body capacitance data, the pre-charge capacitance data and the preset measurement voltage, a charge and discharge analysis is performed on the pre-charge capacitance to obtain the preset pre-charge voltage.

3. The method according to claim 2, characterized in that The performing charge and discharge analysis on the pre-charge capacitor based on the body capacitance data, the pre-charge capacitance data and the preset measurement voltage to obtain the preset pre-charge voltage includes: Based on the preset measurement voltage, determining a target charging voltage corresponding to the pre-charge capacitor; Based on the target charging voltage, the bulk capacitance data and the pre-charge capacitance data, a discharge analysis is performed on the pre-charge capacitance to obtain the preset pre-charge voltage.

4. The method according to claim 2, characterized in that: The target measurement device also includes a body capacitance measurement module; the body capacitance data is obtained by: Based on the body capacitance measurement module, body capacitance of the target cable main insulation is measured to obtain the body capacitance data.

5. The method according to claim 1, characterized in that The target measurement device further includes a first switch and a first resistor, one end of the first switch is connected to one end of the first resistor, the other end of the first resistor is connected to the first output end of the power module, the other end of the first switch is connected to one end of the pre-charge capacitor, and the other end of the pre-charge capacitor is connected to the second output end of the power module; The pre-charging the pre-charge capacitor so that the voltage of the pre-charge capacitor reaches a preset pre-charge voltage includes: Controlling the output voltage of the power module to be adjusted to the preset pre-charge voltage; When the output voltage of the power module is the preset pre-charge voltage, the first switch is controlled to close for a preset time so that the power module pre-charges the pre-charge capacitor and charges the voltage of the pre-charge capacitor to the preset pre-charge voltage.

6. The method according to claim 5, characterized in that The target measurement device further includes a preset diode, which is disposed between the first switch and the first resistor, an anode of the preset diode is connected to one end of the first resistor, and a cathode of the preset diode is connected to one end of the first switch.

7. The method according to claim 5, characterized in that The target measurement device further includes a first wiring terminal, a second wiring terminal, a second switch and a second resistor, one end of the second switch is connected to one end of the pre-charge capacitor, the other end of the second switch is connected to one end of the second resistor, the other end of the second resistor is connected to the first wiring terminal, the other end of the pre-charge capacitor is connected to the second wiring terminal, and the first wiring terminal and the second wiring terminal are used to be connected to two ends of the main insulation of the target cable respectively; The method of controlling the power module and the pre-charge capacitor to discharge toward the main insulation of the target cable based on the preset measurement voltage includes: Controlling the output voltage of the power module to be adjusted to the preset measurement voltage; When the output voltage of the power module is the preset measurement voltage, the second switch is controlled to be closed so that the power module and the pre-charge capacitor discharge toward the main insulation of the target cable.

8. The method according to claim 7, characterized in that The target measurement device further includes a current acquisition module, which is disposed between the second resistor and the first wiring terminal, wherein a first input terminal of the current acquisition module is connected to the other end of the second resistor, and a second input terminal of the current acquisition module is connected to the first wiring terminal; The collecting of target current data flowing through the main insulation of the target cable during the discharge process includes: Based on the current acquisition module, the target current data is acquired.

9. A polarization current measuring device for a power cable, characterized in that: The target measuring device is provided, and the target measuring device includes a power module and a pre-charge capacitor; the polarization current measuring device of the power cable includes: A pre-charge processing module, used for performing a pre-charge processing on the pre-charge capacitor so that the voltage of the pre-charge capacitor reaches a preset pre-charge voltage; A first execution module is used to control the power module and the pre-charge capacitor to discharge toward the target cable main insulation based on a preset measurement voltage when the voltage of the pre-charge capacitor is the preset pre-charge voltage, so that during the discharge of the power module, the body capacitance of the target cable main insulation is charged by the pre-charge capacitor; the power module and the pre-charge capacitor are connected in parallel, and the preset measurement voltage is less than the preset pre-charge voltage; the preset measurement voltage is a preset supply voltage corresponding to the power module during the discharge of the power module; The second execution module is used to collect target current data flowing through the main insulation of the target cable during the discharge process.

10. 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 polarization current measurement method for a power cable according to any one of claims 1 to 8.

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