Method and device for determining the aging time of cable sheath protectors

Abstract

This application discloses a method and apparatus for determining the aging time of a cable sheath protector. The method includes: acquiring a first resistive current and a first voltage of the first cable sheath protector under normal operating conditions at a target time, wherein the target time is the moment when the adjustable parallel resonator electrically connected to it is in resonance, and the first resistive current is the resistive component of its leakage current at the target time; calculating a first insulation resistance based on the first resistive current and the first voltage; and matching the first insulation resistance with a preset relational library to obtain the first aging time of the cable sheath protector at the target time. This application solves the technical problem of related technologies that can only monitor the insulation resistance of the cable sheath protector under power-off conditions, resulting in low efficiency and high cost in calculating the aging time of the cable sheath protector.

Description

Technical Field

[0001] This application relates to the field of power technology, and more specifically, to a method and apparatus for determining the aging time of a cable sheath protector. Background Technology

[0002] Cable sheath protectors are important devices that protect the cable sheath from various overvoltage damages. They can have several different grounding methods, including: (1) direct grounding, i.e., one end is directly grounded and the other end is grounded through the sheath protector; (2) protection nodes, which can be further subdivided into: direct grounding at the midpoint and grounding of the shields at both ends through the protective layer; and grounding of the midpoint through the protective layer and direct grounding at both ends; and (3) cross-interconnection of the sheaths. Among these various grounding methods, direct grounding poses the greatest voltage risk to the protector.

[0003] Currently, when measuring the insulation resistance of cable sheath protectors, related technologies typically involve using a megohmmeter to apply DC power for preliminary testing under power outage conditions. Therefore, this method can only be used during periodic inspections or when a fault occurs, and cannot monitor the insulation status of the cable sheath protector in real time. This makes it difficult to detect damage or malfunctions in the cable sheath protector in a timely manner. Furthermore, traditional preliminary testing results in significant economic losses due to a single power outage, leading to high measurement costs.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This application provides a method and apparatus for determining the aging time of a cable sheath protector, which at least solves the technical problem that related technologies can only monitor the insulation resistance of the cable sheath protector under power failure conditions, resulting in low efficiency and high cost in calculating the aging time of the cable sheath protector.

[0006] According to one aspect of the embodiments of this application, a method for determining the aging time of a cable sheath protector is provided, comprising: obtaining a first resistive current of the first cable sheath protector at a target time and a first voltage of the first cable sheath protector under normal operating conditions, wherein the target time is the time when an adjustable parallel resonator electrically connected to the first cable sheath protector is in a resonant state, and the first resistive current is the resistive component of the leakage current of the first cable sheath protector at the target time; calculating a first insulation resistance of the first cable sheath protector at the target time based on the first resistive current and the first voltage; matching the first insulation resistance with a preset relational database to obtain the first aging time of the sheath of the first cable sheath protector at the target time, wherein the relational database stores multiple sets of correspondences between insulation resistance and aging time.

[0007] Optionally, obtaining the first resistive current of the first cable sheath protector at a target time and the first voltage of the first cable sheath protector under normal operating conditions includes: during the process of adjusting the inductance value of the adjustable parallel resonator from the minimum to the maximum value, obtaining the leakage current of the first cable sheath protector collected by the leakage current monitoring device, determining the target time when the leakage current is at a trough, and using the leakage current at the target time as the first resistive current of the first cable sheath protector; and obtaining the first voltage of the first cable sheath protector under normal operating conditions collected by the voltage monitoring device.

[0008] Optionally, the adjustable parallel resonator includes: a reactor and a rotating structure for adjusting the connection state of the reactor, wherein the adjustable parallel resonator connection control command initiated by the client is received, wherein the adjustable parallel resonator connection control command carries a digital signal for controlling the connection state of the adjustable parallel resonator; when the digital signal is valid, the adjustable parallel resonator is electrically connected to the first cable sheath protector; when the digital signal is invalid, the adjustable parallel resonator is electrically disconnected from the first cable sheath protector.

[0009] Optionally, the expression for the range of inductance values ​​of the adjustable parallel resonator is as follows:

[0010]

[0011] Where L represents the inductance value of the adjustable parallel resonator, and K max K represents the upper limit coefficient of the reactor. mim C represents the lower limit coefficient of the reactor. max C represents the maximum capacitance value of multiple second cable sheath protectors under normal operating conditions and when the leakage current is less than a preset threshold. mim This represents the minimum capacitance value of multiple second cable sheath protectors under normal operating conditions and when the leakage current is less than a preset threshold. The second cable sheath protectors are of the same model as the first cable sheath protectors. ω represents the electrical angular velocity.

[0012] Optionally, the leakage current monitoring device may include at least one of the following: current transformer, Hall effect sensor, or Rogowski coil.

[0013] Optionally, the expression for the range of values ​​of the leakage current monitored by the leakage current monitoring device is as follows:

[0014]

[0015] Among them, U min U represents the minimum operating voltage across the first cable sheath protector when it is working normally. maxR represents the maximum operating voltage across the first cable sheath protector when it is working normally. max R represents the maximum insulation resistance value of multiple second cable sheath protectors under normal operating conditions and when the leakage current is less than a preset threshold. min This indicates the minimum insulation resistance value of multiple second cable sheath protectors under normal operating conditions and when the leakage current is less than a preset threshold. The second cable sheath protectors are of the same model as the first cable sheath protectors.

[0016] Optionally, the process of constructing the relational database includes: identifying multiple second inductive sheath protectors of the same model as the first cable sheath protector; for each second cable sheath protector, obtaining the second resistive current and second aging time of the second cable sheath protector at multiple times, as well as the second voltage of the second cable sheath protector under normal operating conditions, and calculating the second insulation resistance of the second cable sheath protector at multiple times based on the multiple second resistive currents and second voltages; determining the correspondence between the second insulation resistance and second aging time of the second cable sheath protector at multiple times; and constructing a relational database based on the correspondence between the second insulation resistance and second aging time of the multiple second cable sheath protectors at multiple times.

[0017] According to another aspect of the embodiments of this application, an aging time determination device for a cable sheath protector is also provided, comprising: an acquisition module, configured to acquire a first resistive current of the first cable sheath protector at a target time and a first voltage of the first cable sheath protector under normal operating conditions, wherein the target time is the time when an adjustable parallel resonator electrically connected to the first cable sheath protector is in a resonant state, and the first resistive current is the resistive component of the leakage current of the first cable sheath protector at the target time; a first determination module, configured to calculate a first insulation resistance of the first cable sheath protector at the target time based on the first voltage and the first resistive current; and a second determination module, configured to match the first insulation resistance with a preset relational database to obtain the first aging time of the sheath of the first cable sheath protector at the target time, wherein the relational database stores multiple correspondences between insulation resistance and aging time.

[0018] According to another aspect of the embodiments of this application, a computer program product is also provided, the computer program product including a stored computer program, wherein when the computer program is executed by a processor, it implements the above-described method for determining the aging time of a cable sheath protector.

[0019] According to another aspect of the embodiments of this application, an electronic device is also provided, the electronic device including: a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the above-described method for determining the aging time of the cable sheath protector through the computer program.

[0020] In this embodiment, an adjustable parallel resonator is electrically connected to a cable sheath protector via a frame. This allows for monitoring of the cable sheath protector's insulation current without power interruption. The insulation resistance can be obtained using the normal operating voltage and insulation current of the first cable sheath protector. Compared to traditional methods that use DC power to measure insulation resistance, this solution enables live monitoring, allowing for real-time monitoring of the cable sheath protector's status and timely troubleshooting of damage or malfunctions. This solves the problem that related technologies can only monitor the insulation resistance of cable sheath protectors under power-off conditions, resulting in low efficiency and high cost in calculating the aging time of cable sheath protectors. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a hardware structure block diagram of a computer terminal for implementing a method for determining the aging time of a cable sheath protector, according to an embodiment of this application.

[0023] Figure 2 This is a flowchart illustrating an optional method for determining the aging time of a cable sheath protector according to an embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the connection between an optional cable sheath protector and an adjustable parallel resonator according to an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the connection between three adjustable parallel resonators and three cable sheath protectors according to an embodiment of this application, using an optional rotating structure.

[0026] Figure 5 This is a schematic diagram of an optional aging time determination device for a cable sheath protector according to an embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the structure of an optional electronic device according to an embodiment of this application. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] Furthermore, all information and data (including but not limited to user device information, user personal information, etc.) involved in this application are information and data authorized by the user or fully authorized by all parties. For example, this system has an interface with the relevant user or organization. Before obtaining relevant information, it needs to send an acquisition request to the aforementioned user or organization through the interface, and obtain the relevant information after receiving consent from the aforementioned user or organization.

[0031] To better understand the embodiments of this application, the technical terms involved in the embodiments of this application are explained below:

[0032] Cable sheath protector: This is a protective device used to protect the metal sheath of a cable from various overvoltage hazards. It effectively limits induced voltage and fault overvoltage on the metal sheath (or metal jacket) of the cable sheath protector. It is typically installed between the metal sheath of the cable sheath protector and ground, using a no-series gap design. Under normal circumstances, the current flowing through the protector is very small, in the microampere range. However, when an overvoltage occurs on the cable sheath protector, the protector's resistance decreases, the current increases, releasing the voltage and current on the cable sheath protector, thus ensuring the normal and safe operation of the cable sheath protector.

[0033] Leakage current refers to the abnormal current flowing out of electrical equipment or circuits due to insulation damage, leakage, or other reasons. It is usually measured in milliamperes (mA). Currently, commonly used leakage current detection methods include: grounding resistance method, residual current device (RCD), insulation resistance measurement, and thermal imaging detection method.

[0034] Insulation aging: During long-term operation, the insulation of electrical equipment undergoes a series of physical changes, such as morphological changes like softening or melting of solid dielectrics and volatilization of low molecular weight compounds and plasticizers, as well as chemical changes such as oxidation, electrolysis, ionization, and the production of new substances. These changes cause the electrical, mechanical, and other properties of the equipment to gradually deteriorate, such as increased conductivity and dielectric loss, brittleness, and cracking. These phenomena are collectively referred to as insulation aging.

[0035] The basic principle of a current transformer is based on the principle of electromagnetic induction, which converts a large primary current into a small secondary current for measurement.

[0036] Hall effect sensors utilize the Hall effect principle. When the magnetic flux generated by the primary current is concentrated in the magnetic circuit through a high-quality magnetic core, the Hall element, fixed in the air gap, detects the magnetic flux. A multi-turn coil wound on the magnetic core outputs a reverse compensation current to cancel out the magnetic flux generated by the primary current, ensuring that the magnetic flux in the magnetic circuit remains zero. Through special circuit processing, the sensor's output can accurately reflect changes in the primary current.

[0037] A Rogowski coil is a non-contact current sensor primarily used in applications involving high alternating currents, such as AC motor control, escalators, overhead lines, and cables.

[0038] Example 1

[0039] According to an embodiment of this application, a method embodiment for determining the aging time of a cable sheath protector is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0040] The methods and embodiments provided in this application can be executed on mobile terminals, computer terminals, or similar computing devices. Figure 1 A hardware block diagram of a computer terminal (or mobile device) for implementing a method for determining the aging time of a cable sheath protector is shown. Figure 1As shown, the computer terminal 10 (or mobile device 10) may include one or more processors 102 (shown as 102a, 102b, ..., 102n in the figure) (processor 102 may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.), a memory 104 for storing data, and a transmission device 106 for communication functions. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of a BUS bus), a network interface, a power supply, and / or a camera. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the aforementioned electronic device. For example, computer terminal 10 may also include... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0041] It should be noted that the aforementioned one or more processors 102 and / or other data processing circuits are generally referred to herein as "data processing circuits". These data processing circuits may be embodied, in whole or in part, in software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuits may be a single, independent processing module, or may be integrated, in whole or in part, into any other element within the computer terminal 10 (or mobile device). As involved in the embodiments of this application, the data processing circuits serve as a processor control mechanism (e.g., selection of a variable resistor termination path connected to an interface).

[0042] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the aging time determination method of the cable sheath protector in the embodiments of this application. The processor 102 executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, to implement the above-mentioned application method for determining the aging time of the cable sheath protector. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the computer terminal 10 via a network. Examples of the above-mentioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0043] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the communication provider of the computer terminal 10. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0044] The display can be, for example, a touchscreen liquid crystal display (LCD) that allows the user to interact with the user interface of the computer terminal 10 (or mobile device).

[0045] Under the above operating environment, Figure 2 This is a flowchart illustrating an optional method for determining the aging time of a cable sheath protector according to an embodiment of this application. Figure 2 As shown, the method includes at least steps S202-S206, wherein:

[0046] Step S202: Obtain the first resistive current of the first cable sheath protector at the target time and the first voltage of the first cable sheath protector under normal operating conditions.

[0047] In the technical solution provided in step S202, the aforementioned first cable sheath protector is a single-ended grounded cable sheath protector used at the measurement site; the aforementioned target time is the moment when the adjustable parallel resonator electrically connected to the first cable sheath protector is in resonance; the aforementioned first voltage is the terminal voltage value of the first cable sheath protector under normal operating conditions; the aforementioned first resistive current is the resistive component of the leakage current of the first cable sheath protector at the target time, which can be understood as: the resistive component contained in the leakage current through the protector when the first cable sheath protector is operating normally under parallel resonance conditions. The magnitude of the leakage current mainly depends on the design and manufacturing quality of the cable sheath protector, as well as the influence of the external environment. It can reflect the overall fault information of the cable sheath insulation. That is, under normal operating conditions, the leakage current is very small, usually at the microampere level; however, once the cable sheath is damaged or aged, the protector will quickly start working, and the charge discharged onto the cable sheath will increase to protect the cable sheath protector's safe operation. Therefore, the resistive component of the leakage current will also increase accordingly.

[0048] Step S204: Calculate the first insulation resistance of the first cable sheath protector at the target time based on the first resistive current and the first voltage.

[0049] In the technical solution provided in step S204, the first insulation resistance of the first cable sheath protector at the target time can be calculated based on the first voltage and the first resistive current and using Ohm's law. The first insulation resistance can indirectly reflect the insulation condition of the sheath of the first cable sheath protector.

[0050] Step S206: Match the first insulation resistance with a preset relational library to obtain the first aging time of the first cable sheath protector at the target time.

[0051] In the technical solution provided in step S206, a database of relationships between multiple sets of insulation resistance and aging time is pre-constructed, and the first insulation resistance is matched with the database to obtain the aging time corresponding to the first insulation resistance. This aging time is the first aging time of the first cable sheath protector sheath, also known as the aging time of insulation.

[0052] The method described in this embodiment will be further described below.

[0053] As an optional implementation, in the technical solution provided in step S202 above, the method may include:

[0054] Step S2021: During the process of adjusting the inductance value of the adjustable parallel resonator from the minimum value to the maximum value, the leakage current of the first cable sheath protector is acquired by using the leakage current monitoring device, the target time when the leakage current is at the trough is determined, and the leakage current at the target time is used as the first resistive current of the first cable sheath protector.

[0055] Step S2022: Obtain the first voltage of the first cable sheath protector under normal operating conditions by using a voltage monitoring device.

[0056] In this embodiment, the inductance value of the adjustable parallel resonator is adjusted unidirectionally from its minimum value to its maximum value. A leakage current monitoring device is used to monitor the changes in current at both ends of the first cable sheath protector. The trough where the leakage current monotonically decreases and then monotonically increases is taken as the resonant point (and this resonant point corresponds to the target time). The leakage current at this resonant point is the first resistive current of the first cable sheath protector, denoted as I. k Simultaneously, the first voltage across the first cable sheath protector under normal operating conditions is collected using voltage monitoring equipment (such as a voltmeter or multimeter), denoted as U. n .

[0057] It should be noted that a cable sheath is connected to a cable sheath protector, and a cable sheath protector is equipped with an adjustable parallel resonator and a leakage current monitoring device to extract and monitor the leakage current of the corresponding cable sheath protector.

[0058] Specifically, the embodiments of this application can be implemented according to... Figure 3 The method shown establishes an electrical connection between the adjustable parallel resonator and the first cable sheath protector to extract the resistive component of the leakage current of the first cable sheath protector, such as... Figure 3 As shown in the diagram. 1 and 2 are the two terminals of the adjustable parallel resonator connected to the first cable sheath protector; 3 is the reactor of the adjustable parallel resonator; 4 is the connecting plate of the first cable sheath protector; 5 is the main grounding wire in the grounding box of the first cable sheath protector; 6 is the first cable sheath protector; 7 is the connection point between one end 1 of the adjustable parallel resonator connected to the first cable sheath protector and the connecting plate 4 of the first cable sheath protector; and 8 is a rotating structure for adjusting the reactor's connection state.

[0059] Figure 3 One end 1 of the adjustable parallel resonator is connected to the connecting plate 4 of the first cable sheath protector via a non-fixed contact connection method, which includes, but is not limited to, tripping and overlapping connections. One end 2 of the adjustable parallel resonator is fixedly connected to the main grounding wire 5 in the grounding box of the first cable sheath protector. The adjustable parallel resonator's rotating mechanism 8 rotates 1 and 3, enabling the adjustable parallel resonator to be arbitrarily connected to the grounding box: when the rotating mechanism 8 electrically contacts one end 1 of the adjustable parallel resonator with the connecting plate 4 of the first cable sheath protector, the adjustable parallel resonator is connected in parallel with the protector; when the rotating mechanism 8 does not electrically contact one end 1 of the adjustable parallel resonator with the connecting plate 4, the adjustable parallel resonator is disconnected.

[0060] Optionally, the rotating mechanism 8 can be controlled by numerical control in this embodiment. The specific implementation method may include: receiving an adjustable parallel resonator access control command initiated by the client, wherein the adjustable parallel resonator access control command carries a digital signal (such as a binary digital signal) for controlling the access state of the adjustable parallel resonator; when the digital signal is a valid value, controlling the adjustable parallel resonator to be electrically connected to the first cable sheath protector; when the digital signal is an invalid value, controlling the adjustable parallel resonator to be electrically disconnected from the first cable sheath protector.

[0061] For example, Figure 4 This is a schematic diagram illustrating the connection between three adjustable parallel resonators and three cable sheath protectors according to an optional rotating structure embodiment of this application, as shown below. Figure 4As shown, the three-phase cable sheath is connected to three cable sheath protectors, and each cable sheath protector is electrically connected to an adjustable parallel resonator. The rotating structure of the adjustable parallel resonator can control its connection state. (Regarding...) Figure 4 In the scenario shown, the digital signal can use a three-bit binary digital signal, where a valid value of 1 represents an electrical connection and an invalid value of 0 represents a disconnection. Each bit represents a different adjustable parallel resonator; for example, 100 indicates that the first adjustable parallel resonator is electrically connected to the cable sheath protector, 010 indicates that the second adjustable parallel resonator is electrically connected to the cable sheath protector, and 001 indicates that the third adjustable parallel resonator is electrically connected to the cable sheath protector. It should be noted that the above valid and invalid values ​​can be set according to the actual application scenario, and this application embodiment does not impose specific limitations on this.

[0062] Furthermore, to ensure that parallel resonance can occur, the reactance range of the adjustable parallel resonator can be determined based on the maximum and minimum capacitance values ​​of various types of protectors (i.e., the second cable sheath protector) under the same cable voltage level monitored by the first cable sheath protector, when the leakage current is less than a preset threshold condition (preferably set to 1mA, because a leakage current exceeding 1mA may lead to electric shock risk). Therefore, the expression for the reactance range of the adjustable parallel resonator can be written as:

[0063]

[0064] Where L represents the inductance value of the adjustable parallel resonator, and K max K represents the upper limit coefficient of the reactor. mim C represents the lower limit coefficient of the reactor. max This represents the maximum capacitance value of multiple second cable sheath protectors under normal operating conditions and with leakage current less than a preset threshold (i.e., the maximum value among all capacitance values ​​of multiple second cable sheath protectors at the same voltage level), C. mim ω represents the minimum capacitance value of multiple second cable sheath protectors under normal operating conditions and leakage current less than a preset threshold (i.e., the minimum capacitance value among all multiple second cable sheath protectors measured under the same voltage level), and ω represents the electrical angular velocity (its value can be 100π).

[0065] Optionally, the types of leakage current monitoring equipment used above include, but are not limited to, current transformers, Hall effect sensors, Rogowski coils, etc. In practical applications, factors such as the measurement environment, measurement cost, and measurement accuracy requirements need to be considered when selecting leakage current monitoring equipment.

[0066] The range of leakage current monitored by the leakage current monitoring device can be determined based on the maximum and minimum insulation resistance values ​​of various types of protectors (i.e., the second cable sheath protector) under the same cable voltage level monitored by the first cable sheath protector, when the leakage current is less than a preset threshold (e.g., 1mA) during normal operation. Therefore, its expression can be written as:

[0067]

[0068] Among them, U min U represents the minimum operating voltage across the first cable sheath protector when it is working normally. max R represents the maximum operating voltage across the first cable sheath protector when it is working normally. max R represents the maximum insulation resistance value of multiple second cable sheath protectors under normal operating conditions and with leakage current less than a preset threshold (i.e., the maximum value among all measured resistance values ​​of multiple second cable sheath protectors at the same voltage level). min This represents the minimum insulation resistance value of multiple second cable sheath protectors under normal operating conditions and with leakage current less than a preset threshold (i.e., the minimum resistance value among all multiple second cable sheath protectors measured at the same voltage level).

[0069] After obtaining the first resistive current I of the first cable sheath protector at the target time through the above step S202, k and the first voltage U n Then, the first insulation resistance of the first cable sheath protector at the target time can be obtained according to the following formula:

[0070]

[0071] As an optional implementation, in the technical solution provided in step S206 above, the relational database can be established by the following methods:

[0072] Step 1: Identify multiple second inductive sheath protectors that are the same model as the first cable sheath protector.

[0073] Step 2: For each second cable sheath protector, obtain the second resistive current and second aging time of the second cable sheath protector at multiple times, as well as the second voltage of the second cable sheath protector under normal operating conditions, and calculate the second insulation resistance of the second cable sheath protector at multiple times based on the multiple second resistive currents and second voltages; determine the correspondence between the second insulation resistance and the second aging time of the second cable sheath protector at multiple times.

[0074] Step 3: Construct a relational library based on the correspondence between the second insulation resistance and the second aging time of multiple second cable sheath protectors at multiple times.

[0075] In this embodiment, a heating aging test is first performed on the second cable sheath protector to obtain multiple second resistive currents and second aging times at multiple moments, as well as the second voltage across the second cable sheath protector under normal operating conditions. These moments also correspond to the moments when the adjustable parallel resonator electrically connected to the second cable sheath protector is in resonance. Then, the second insulation resistance of the second cable sheath protector is calculated based on the multiple second resistive currents and second voltages at multiple moments, and the correspondence between the second insulation resistance and the second aging time at these multiple moments is determined. Finally, the correspondence between the second insulation resistance and the second aging time of each second cable sheath protector at each moment is recorded and stored in a preset database to obtain the relational database. The second inductive sheath protector and the first cable sheath protector are products of the same model manufactured by the same company, thus possessing the same product parameters. This avoids the situation where different product parameters lead to the final relational database failing to accurately obtain the first aging time corresponding to the first insulation resistance of the first cable sheath protector.

[0076] Based on the scheme defined in steps S202 to S206 above, it can be understood that, in the embodiment, by electrically connecting the adjustable parallel resonator and the cable sheath protector through a frame, the insulation current of the cable sheath protector can be monitored without interrupting power. The insulation resistance can be obtained using the normal operating voltage and insulation current of the first cable sheath protector. Compared with the traditional method of measuring insulation resistance using a DC power supply, the scheme of this application enables live monitoring, thereby allowing real-time monitoring of the state of the cable sheath protector and timely troubleshooting of damage or faults. This solves the technical problem that related technologies can only monitor the insulation resistance of the cable sheath protector under power-off conditions, resulting in low efficiency and high cost in calculating the aging time of the cable sheath protector.

[0077] Example 2

[0078] Based on Embodiment 1 of this application, an embodiment of a cable sheath protector aging time determination device is also provided. This device executes the cable sheath protector aging time determination device described in the above embodiment during operation. Wherein, Figure 5 This is a schematic diagram of an optional aging time determination device for cable sheath protectors according to an embodiment of this application, as shown below. Figure 5As shown, the aging time determination device for the cable sheath protector includes at least an acquisition module 52, a first determination module 54, and a second determination module 56, wherein:

[0079] The acquisition module 52 is used to acquire the first resistive current of the first cable sheath protector at the target time and the first voltage of the first cable sheath protector under normal operating conditions. The target time is the time when the adjustable parallel resonator electrically connected to the first cable sheath protector is in resonance state, and the first resistive current is the resistive component of the leakage current of the first cable sheath protector at the target time.

[0080] The first determining module 54 is used to calculate the first insulation resistance of the first cable sheath protector at the target time based on the first voltage and the first resistive current.

[0081] The second determining module 56 is used to match the first insulation resistance with a preset relational library to obtain the first aging time of the first cable sheath protector at the target time. The relational library stores multiple correspondences between insulation resistance and aging time.

[0082] It should be noted that each module in the aging time determination device of the above-mentioned cable sheath protector can be a program module (for example, a set of program instructions to implement a certain function) or a hardware module. For the latter, it can be manifested in the following forms, but is not limited to them: each of the above modules is manifested as a processor, or the functions of each of the above modules are implemented by a processor.

[0083] Example 3

[0084] According to an embodiment of this application, a computer program product is also provided, which includes a stored computer program, wherein when the computer program is executed by a processor, it implements the aging time determination method for the cable sheath protector in Embodiment 1.

[0085] Optionally, the computer program performs the following steps: obtaining the first resistive current of the first cable sheath protector at a target time and the first voltage of the first cable sheath protector under normal operating conditions, wherein the target time is the time when the adjustable parallel resonator electrically connected to the first cable sheath protector is in resonance, and the first resistive current is the resistive component of the leakage current of the first cable sheath protector at the target time; calculating the first insulation resistance of the first cable sheath protector at the target time based on the first resistive current and the first voltage; matching the first insulation resistance with a preset relational database to obtain the first aging time of the sheath of the first cable sheath protector at the target time, wherein the relational database stores multiple sets of correspondences between insulation resistance and aging time.

[0086] According to an embodiment of this application, a processor is also provided for running a program, wherein the program executes the aging time determination method for the cable sheath protector in Embodiment 1.

[0087] Optionally, the program executes the following steps during runtime: obtaining the first resistive current of the first cable sheath protector at a target time and the first voltage of the first cable sheath protector under normal operating conditions, wherein the target time is the moment when the adjustable parallel resonator electrically connected to the first cable sheath protector is in resonance, and the first resistive current is the resistive component of the leakage current of the first cable sheath protector at the target time; calculating the first insulation resistance of the first cable sheath protector at the target time based on the first resistive current and the first voltage; matching the first insulation resistance with a preset relational database to obtain the first aging time of the sheath of the first cable sheath protector at the target time, wherein the relational database stores multiple sets of correspondences between insulation resistance and aging time.

[0088] According to an embodiment of this application, an electronic device is also provided, wherein, Figure 6 This is a schematic diagram of the structure of an optional electronic device according to an embodiment of this application, such as... Figure 6 As shown, the electronic device includes one or more processors; a memory for storing one or more programs, which, when executed by one or more processors, cause the one or more processors to run the programs, wherein the programs are configured to execute the aging time determination method for the cable sheath protector in Embodiment 1 above.

[0089] Optionally, the processor is configured to execute the following steps via a computer program: obtaining the first resistive current of the first cable sheath protector at a target time and the first voltage of the first cable sheath protector under normal operating conditions, wherein the target time is the moment when the adjustable parallel resonator electrically connected to the first cable sheath protector is in a resonant state, and the first resistive current is the resistive component of the leakage current of the first cable sheath protector at the target time; calculating the first insulation resistance of the first cable sheath protector at the target time based on the first resistive current and the first voltage; matching the first insulation resistance with a preset relational database to obtain the first aging time of the sheath of the first cable sheath protector at the target time, wherein the relational database stores multiple sets of correspondences between insulation resistance and aging time.

[0090] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0091] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0092] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between units or modules may be electrical or other forms.

[0093] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0094] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0095] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0096] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for determining the aging time of a cable sheath protector, characterized in that, Including: Among them, The first resistive current of the first cable sheath protector at a target time and the first voltage of the first cable sheath protector under normal operating conditions are obtained, wherein the target time is the time when the adjustable parallel resonator electrically connected to the first cable sheath protector is in a resonant state, and the first resistive current is the resistive component of the leakage current of the first cable sheath protector at the target time. Calculate the first insulation resistance of the first cable sheath protector at the target time based on the first resistive current and the first voltage; The first insulation resistance is matched with a preset relational database to obtain the first aging time of the first cable sheath protector at the target time. The relational database stores multiple sets of correspondences between insulation resistance and aging time.

2. The method according to claim 1, characterized in that, Acquiring the first resistive current of the first cable sheath protector at the target time and the first voltage of the first cable sheath protector under normal operating conditions includes: During the process of adjusting the inductance value of the adjustable parallel resonator from the minimum to the maximum value, the leakage current of the first cable sheath protector is acquired using a leakage current monitoring device, the target time when the leakage current is at a trough is determined, and the leakage current at the target time is used as the first resistive current of the first cable sheath protector. The voltage of the first cable sheath protector under normal operating conditions is obtained by using a voltage monitoring device.

3. The method according to claim 2, characterized in that, The adjustable parallel resonator includes: a reactor and a rotating structure for adjusting the reactor's connection state, wherein, Receive an adjustable parallel resonator access control command initiated by the client, wherein the adjustable parallel resonator access control command carries a digital signal for controlling the access state of the adjustable parallel resonator. When the digital signal is valid, control the adjustable parallel resonator to be electrically connected to the first cable sheath protector; If the digital signal is invalid, the adjustable parallel resonator is electrically disconnected from the first cable sheath protector.

4. The method according to claim 2, characterized in that, The expression for the range of inductance values ​​of the adjustable parallel resonator is as follows: ； Where L represents the inductance value of the adjustable parallel resonator. This indicates the upper limit coefficient of the reactor. This represents the lower limit coefficient of the reactor. This represents the maximum capacitance value of multiple second cable sheath protectors under normal operating conditions and when the leakage current is less than a preset threshold. This represents the minimum capacitance value of multiple second cable sheath protectors under normal operating conditions and when the leakage current is less than a preset threshold. The second cable sheath protectors are of the same model as the first cable sheath protector. It represents electrical angular velocity.

5. The method according to claim 2, characterized in that, The leakage current monitoring device includes at least one of the following types: current transformer, Hall effect sensor, Rogowski coil.

6. The method according to claim 2, characterized in that, The expression for the range of values ​​of the leakage current monitored by the leakage current monitoring device is as follows: ； in, This indicates the minimum operating voltage across the first cable sheath protector when it is working normally. This indicates the maximum operating voltage at both ends of the first cable sheath protector when it is working normally. This represents the maximum insulation resistance value of multiple second cable sheath protectors under normal operating conditions and when the leakage current is less than a preset threshold. This indicates the minimum insulation resistance value of multiple second cable sheath protectors under normal operating conditions and when the leakage current is less than a preset threshold. The second cable sheath protectors are of the same model as the first cable sheath protector.

7. The method according to claim 1, characterized in that, The process of constructing the relational database includes: Identify multiple second cable sheath protectors of the same model as the first cable sheath protector; For each of the second cable sheath protectors, the second resistive current and second aging time of the second cable sheath protector at multiple times are obtained, as well as the second voltage of the second cable sheath protector under normal operating conditions. The second insulation resistance of the second cable sheath protector at multiple times is calculated based on the multiple second resistive currents and the second voltage. The correspondence between the second insulation resistance and the second aging time of the second cable sheath protector at multiple times is determined. The relationship library is constructed by the correspondence between the second insulation resistance and the second aging time of multiple second cable sheath protectors at multiple times.

8. A device for determining the aging time of a cable sheath protector, characterized in that, include: The acquisition module is used to acquire the first resistive current of the first cable sheath protector at a target time and the first voltage of the first cable sheath protector under normal operating conditions, wherein the target time is the time when the adjustable parallel resonator electrically connected to the first cable sheath protector is in a resonant state, and the first resistive current is the resistive component of the leakage current of the first cable sheath protector at the target time. The first determining module is used to calculate the first insulation resistance of the first cable sheath protector at the target time based on the first voltage and the first resistive current. The second determining module is used to match the first insulation resistance with a preset relational library to obtain the first aging time of the first cable sheath protector at the target time, wherein the relational library stores multiple correspondences between insulation resistance and aging time.

9. A computer program product, characterized in that, include: A computer program, wherein when executed by a processor, the computer program implements the method for determining the aging time of a cable sheath protector as described in any one of claims 1 to 7.

10. An electronic device, characterized in that, include: A memory and a processor, the processor being configured to run a program stored in the memory, wherein the program, when running, executes the aging time determination method for a cable sheath protector according to any one of claims 1 to 7.

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