Capacitive current measurement method and terminal equipment of power supply system

Abstract

The present application is applicable to the field of electronic technology and provides a capacitive current measurement method and terminal equipment for a power supply system, including: obtaining a grounding type of the power supply system; determining a target measurement strategy according to the grounding type of the power supply system; measuring the capacitive current of the power supply system based on the target measurement strategy, and by determining the grounding type of the power supply system, and then determining a target measurement strategy corresponding to the grounding type to achieve measurement of the capacitive current of the power supply system, thereby obtaining the measurement strategy that best suits the power supply system, and then accurately measuring the capacitive current of the power supply system, thereby ensuring the operational safety and reliability of the power supply network.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a capacitance current measurement method and terminal equipment of a power supply system. Background Art

[0002] With the rapid development of economy today, how to ensure the safe operation of power supply system is becoming more and more important.

[0003] Most power supply systems supplying power to mining areas operate with an ungrounded neutral point. When a single-phase grounding fault occurs in the line, the current flowing through the fault point is the capacitive current generated by the line-to-ground capacitance. If the capacitive current flowing through the fault point is too large, intermittent grounding arcs will be generated, which can easily cause dangerous situations such as explosions of line cables, lightning arresters and other power equipment, and burning of substation circuit breakers.

[0004] Based on this, in order to improve the operational safety and reliability of the power supply system, it is urgent to provide a method that can accurately measure the capacitive current of the power supply system. Summary of the Invention

[0005] The embodiments of the present application provide a method and terminal device for measuring the capacitance current of a power supply system, which can accurately measure the capacitance current of the power supply system.

[0006] In a first aspect, an embodiment of the present application provides a method for measuring capacitance current of a power supply system, comprising:

[0007] Get the grounding type of the power supply system;

[0008] determining a target measurement strategy according to the grounding type of the power supply system;

[0009] The capacitive current of the power supply system is measured based on the target measurement strategy.

[0010] In a possible implementation of the first aspect, determining a target measurement strategy according to a grounding type of the power supply system includes:

[0011] determining a preliminary measurement strategy based on the grounding type of the power supply system;

[0012] The target measurement strategy is determined according to the capacitance to ground measured by the preliminary measurement strategy.

[0013] In a possible implementation manner of the first aspect, when the grounding type of the power supply system is a neutral point ungrounded system, the preliminary measurement strategy includes a triple-frequency signal injection strategy and a split-frequency signal injection strategy.

[0014] In a possible implementation of the first aspect, determining the target measurement strategy according to the ground capacitance value obtained by measuring the preliminary measurement strategy includes:

[0015] If the measured capacitance to ground is greater than a preset capacitance threshold, determining that the target measurement strategy is a frequency division signal injection strategy;

[0016] If the measured capacitance to ground is not greater than the preset capacitance threshold, the target measurement strategy is determined to be the three-frequency signal injection strategy.

[0017] In a possible implementation of the first aspect, when the grounding type of the power supply system is a neutral point grounding system via an arc suppression coil, the preliminary measurement strategy includes a variable frequency signal injection strategy and an industrial frequency signal injection strategy.

[0018] In a possible implementation of the first aspect, determining the target measurement strategy according to the ground capacitance value obtained by measuring the preliminary measurement strategy includes:

[0019] If the measured capacitance to ground is greater than a preset capacitance threshold, determining that the target measurement strategy is a power frequency signal injection strategy;

[0020] If the measured capacitance to ground is greater than a preset capacitance threshold, it is determined that the target measurement strategy is the variable frequency signal injection strategy.

[0021] In a possible implementation manner of the first aspect, after measuring the capacitive current of the power supply system based on the target measurement strategy, the method further includes:

[0022] Determine whether the measured capacitance current is greater than a preset safety threshold;

[0023] If the measured capacitance current is greater than the preset safety threshold, an alarm message is generated.

[0024] In a second aspect, an embodiment of the present application provides a terminal device, including:

[0025] an acquisition unit, used for acquiring a grounding type of a power supply system;

[0026] a determining unit, configured to determine a target measurement strategy according to a grounding type of the power supply system;

[0027] A measuring unit is configured to measure the capacitive current of the power supply system based on the target measurement strategy.

[0028] In a third aspect, an embodiment of the present application provides a terminal device comprising a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, the steps of the capacitance current measurement method of the power supply system as described in any one of the first aspects above are implemented.

[0029] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of the capacitance current measurement method of the power supply system as described in any one of the first aspects above.

[0030] In a fifth aspect, an embodiment of the present application provides a computer program product. When the computer program product runs on a server, the server can execute the capacitance current measurement method of the power supply system described in any one of the first aspects above.

[0031] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0032] An embodiment of the present application provides a capacitive current measurement method and terminal device for a power supply system. By determining the grounding type of the power supply system and then determining a target measurement strategy corresponding to the grounding type, the capacitive current of the power supply system is measured. The measurement strategy that is most suitable for the power supply system can be obtained, and the capacitive current of the power supply system can be accurately measured to ensure the operational safety and reliability of the power supply network. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 This is a schematic diagram of an implementation flow of a method for measuring capacitance current in a power supply system provided in one embodiment of the present application;

[0035] Figure 2 This is a schematic diagram of an implementation flow of another method for measuring capacitance current in a power supply system provided in one embodiment of the present application;

[0036] Figure 3 This is a schematic diagram of the structure of a terminal device provided in one embodiment of the present application;

[0037] Figure 4 This is a structural diagram of another terminal device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0039] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0040] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0041] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0042] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0043] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0044] The power supply system in the mining area has the following characteristics:

[0045] 1. Many cables. The ground and underground power supply systems in mining areas primarily use high-voltage power cables as the power transmission medium. The capacitive current per unit length of cable lines is more than ten times greater than that of overhead lines. Consequently, the capacitive current in the mining area's power supply system is very high. When a single-phase grounding fault occurs, it is more likely to cause explosions in power equipment such as cables and lightning arresters, and burn out of substation circuit breakers.

[0046] 2. When a cable line fails, the grounding arc generated is a closed arc and is not easy to extinguish by itself.

[0047] 3. Cables are weak-current insulation equipment. For example, the power frequency withstand voltage of a 6KV cross-linked polyethylene cable is 25KV, and the insulation level of 6KV distribution equipment is 42KV. If the cable is subjected to power frequency or transient overvoltage for a long time, it is easy to develop a phase-to-phase fault, leading to a larger accident.

[0048] 4. In the cable line, the high-frequency oscillating current has a large amplitude and decays slowly. The high-frequency oscillating current is much larger than the power frequency current. When the power frequency current passes through zero, the high-frequency oscillating current still has a large amplitude. The key to maintaining arc burning depends on the decay speed of the high-frequency oscillating current and the size of the power frequency current. If the high-frequency oscillating current decays completely, the arc will continue to burn and it will easily develop into a phase-to-phase fault, leading to a larger accident.

[0049] With the extension and increase of mining in mining areas, the power supply network in mining areas has been continuously expanded, the number of cables has been continuously increased, the distribution of ground capacitance has become wider and wider, and the capacitive current in the power supply network has also increased, which seriously endangers the safe operation of the power supply system in mining areas. Therefore, in order to prevent problems before they occur, the capacitive current of the power supply network must be accurately measured to ensure the safety and reliability of the operation of the power supply network. If necessary, it is also possible to consider whether to install an arc suppression coil to compensate for the capacitive current of the grounding point based on the size of the capacitive current, so that the arc at the grounding point can extinguish itself.

[0050] Based on this, an embodiment of the present application provides a capacitive current measurement method for a power supply system, which can accurately measure the capacitive current of the power supply network, thereby ensuring the operational safety and reliability of the power supply network.

[0051] The following describes the capacitance current measurement method of the power supply system provided by the embodiment of the present application with reference to the accompanying drawings:

[0052] See also Figure 1 , Figure 1 This is a flow chart of a method for measuring capacitance current in a power supply system provided by an embodiment of the present application. Figure 1 As shown, the capacitance current measurement method of the power supply system may include S101 to S103, which are described in detail as follows:

[0053] S101: Obtain the grounding type of the power supply system.

[0054] In an embodiment of the present application, the grounding types of the above-mentioned power supply system include a neutral point ungrounded system and a neutral point grounded system via an arc suppression coil.

[0055] It should be noted that the power supply system in mining areas primarily operates with two grounding types: an ungrounded neutral point system and a neutral point grounded via an arc suppression coil. Different grounding types result in different capacitances to ground and influence factors, so the grounding type of the power supply system must be determined first.

[0056] Here, the grounding type of the power supply system may be obtained through a grounding record of the power supply system.

[0057] Here, it is also possible to determine whether the power supply system is a neutral point ungrounded system or a neutral point grounded system via an arc suppression coil by detecting whether the power supply system is connected to the arc suppression coil.

[0058] It should be noted that the grounding types of the above power supply system may also include direct grounding of the neutral point, grounding of the neutral point via a small resistor, etc.

[0059] It should be noted that in the above-mentioned neutral point ungrounded system and the neutral point arc suppression coil grounded system, only the distributed capacitance to ground will affect the zero-sequence current, and the distributed capacitance between phases will not affect the zero-sequence capacitance. Therefore, when analyzing the capacitive current of the power supply system, only the distributed capacitance to ground of the power supply system needs to be considered, and there is no need to consider the distributed capacitance between phases.

[0060] S102: Determine a target measurement strategy according to the grounding type of the power supply system.

[0061] In the embodiment of the present application, since the grounding types of the power supply system are different, the corresponding capacitance to ground is different, and there are also different influencing factors. Therefore, different measurement strategies can be determined according to different grounding types.

[0062] In an embodiment of the present application, the measurement strategy may include but is not limited to a triple-frequency signal injection strategy, a divided-frequency signal injection strategy, a variable-frequency signal injection strategy, and a power frequency signal injection strategy.

[0063] Among them, the three-frequency signal injection strategy refers to injecting three current signals with constant amplitude and changing frequency from the open triangle end of the secondary side (low-voltage side) of the voltage transformer. By measuring the voltage signal fed back to the open triangle side of the voltage transformer, the size of the power supply system's ground capacitance can be calculated, and then the ground capacitance current measurement strategy can be determined.

[0064] The frequency-divided signal injection strategy refers to injecting two current signals with different frequencies and constant amplitudes from the open triangle end of the secondary side of the voltage transformer, measuring the injected voltage signal and current signal at the open triangle end, and calculating the system's capacitance to ground through the vector method, thereby calculating the capacitance current measurement strategy.

[0065] It should be noted that the open delta end refers to the end point of an open delta formed when the three secondary windings of the three phases of the voltage transformer are connected in a delta connection in a system with an ungrounded neutral point.

[0066] The variable frequency signal injection strategy refers to injecting a variable frequency signal from the secondary side of the arc suppression coil to cause resonance between the arc suppression coil and the system's ground capacitance. By scanning the frequency, the resonant frequency of the system is measured, thereby obtaining the system's ground capacitance and calculating the system's ground capacitance current value.

[0067] The power frequency signal injection strategy refers to injecting a power frequency signal into the secondary side of the arc suppression coil, and calculating the capacitor current by measuring the neutral point voltage before current injection, the neutral point voltage after current injection, and the injected current signal.

[0068] It should be noted that the above-mentioned power frequency signal refers to a current signal with a frequency of 50 Hz.

[0069] In an embodiment of the present application, the correspondence between the grounding type and the measurement strategy can be determined in advance. Specifically, when the grounding type is a neutral point ungrounded system, the corresponding measurement strategy can include a three-frequency signal injection strategy and a divided-frequency signal injection strategy; when the grounding type is a neutral point grounded system through an arc suppression coil, the corresponding measurement strategy can include an injection of a variable-frequency signal strategy and an injection of an industrial frequency signal strategy.

[0070] In an embodiment of the present application, the above S102 may include the following steps:

[0071] determining a preliminary measurement strategy based on the grounding type of the power supply system;

[0072] The target measurement strategy is determined according to the capacitance to ground measured by the preliminary measurement strategy.

[0073] In an embodiment of the present application, if the grounding type of the power supply system is a neutral point ungrounded system, the preliminary measurement strategy is determined to be a three-frequency signal injection strategy and a divided-frequency signal injection strategy, and the size of the ground capacitance is measured respectively by the three-frequency signal injection strategy and the divided-frequency signal injection strategy. If the measured ground capacitance is greater than the preset capacitance threshold, the target measurement strategy is determined to be the divided-frequency signal injection strategy; otherwise, the target measurement strategy is determined to be the three-frequency signal injection strategy.

[0074] If the grounding type of the power supply system is a neutral point arc suppression coil grounding system, the preliminary measurement strategy is determined to be the variable frequency signal injection strategy and the power frequency signal injection strategy. The variable frequency signal injection strategy and the power frequency signal injection strategy are used to respectively calculate the size of the ground capacitance. If the measured ground capacitance is greater than the preset capacitance threshold, the target measurement strategy is determined to be the power frequency signal injection strategy; otherwise, the target measurement strategy is determined to be the variable frequency signal injection strategy.

[0075] It should be noted that the ground capacitance can also be set to different levels, for example, the ground capacitance can be set to a first range capacitance and a second range capacitance, the first range capacitance refers to the capacitance with a value between 0 and a preset graded capacitance, the second range capacitance refers to the capacitance with a value between the preset graded capacitance and infinity, and the preset graded capacitance is greater than 0.

[0076] If the measured capacitance to ground is in the first range, then

[0077] S103: Measuring the capacitive current of the power supply system based on a target measurement strategy.

[0078] In the embodiment of the present application, after the target measurement strategy is determined, the capacitive current of the power supply system can be measured using the target measurement strategy.

[0079] For example, when the target measurement strategy is a three-frequency signal injection strategy, the voltage signal fed back when the current signal is input three times is obtained, and then the corresponding capacitance value can be calculated based on the injected current signal and voltage signal, thereby determining the ground capacitance current.

[0080] For example, the corresponding capacitance value can be calculated based on the injected current signal and voltage signal, and then the calculation formula of the ground capacitance current is determined as follows:

[0081]

[0082] Among them, R is the three-phase winding resistance; L is the voltage transformer leakage inductance; Among them, n1 is the number of turns of the winding on the high voltage side of the voltage transformer, n2 is the number of turns of the winding on the low voltage side of the voltage transformer, U oi is the zero-sequence voltage obtained by the i-th measurement (i.e., the voltage of the received voltage signal), i oi is the magnitude of the current signal input for the i-th time; ω i =2πf i ; Among them, f i is the frequency of the current signal input for the i-th time.

[0083] The ground capacitance of the power supply system can be obtained based on the following formula:

[0084]

[0085] Where C is the capacitance of the power supply system to ground.

[0086] Based on the formula: I C =3ωCU, the capacitive current I of the power supply system can be calculated C Among them, ω can be any one of ω1, ω2, and ω3, and U can be the voltage value of the frequency signal feedback corresponding to ω, that is, when ω is ω1, U is U o1 ; When ω is ω2, U is U o2 ; When ω is ω3, U is U o3 .

[0087] As another example, when the target measurement strategy is the frequency division signal injection strategy, two current signals with different frequencies and constant amplitudes are injected from the secondary open triangle end of the voltage transformer, the injected voltage signal and current signal are measured at the open triangle end, and the system capacitance value to ground is calculated by the vector method, and then the value of the capacitive current is calculated.

[0088] For example, a current signal with a frequency of f1 is injected into the open triangle terminal of the voltage transformer, and the current signal i o1 And the voltage signal U o1 , the impedance value Z1 and phase angle value θ1 of the entire series circuit can be determined, wherein the impedance value and phase angle value of the entire series circuit can be obtained during the measurement process, and the specific values ​​need to be determined based on the measurement situation, which is not elaborated in this application.

[0089] R1=Z1cosθ1;

[0090]

[0091] ω1=2πf1;

[0092] Among them, R1 is the three-phase winding resistance, and C is the ground capacitance of the power supply system to be determined.

[0093] A current signal with a frequency of f2 is injected into the open triangle end of the voltage transformer, and the current signal i o2 And the voltage signal U o2 , determine the impedance value Z2 and phase angle value θ2 of the entire series circuit, where the impedance value and phase angle value of the entire series circuit can be obtained during the measurement process. The specific values ​​need to be determined based on the measurement situation, which will not be elaborated in this application.

[0094] R2=Z2cosθ2;

[0095]

[0096] ω2=2πf2;

[0097] Among them, R1 is the three-phase winding resistance, and C is the ground capacitance of the power supply system to be determined.

[0098] Therefore, the ground capacitance of the power supply system can be calculated by combining the results of the two measurements. The formula is as follows:

[0099]

[0100] Then calculate the capacitive current of the power supply system: I C =3ωCU, where ω can be any one of ω1 and ω2, and U can be the voltage value fed back by the frequency signal corresponding to ω, that is, when ω is ω1, U is Uo1; when ω is ω2, U is Uo2.

[0101] As another example, when the target measurement strategy is the variable frequency signal injection strategy, after determining the resonant frequency, the ground capacitance and capacitive current of the power supply system can be determined using the following formula:

[0102]

[0103] I C =ωUC0;

[0104] Where C0 is the ground capacitance of the power supply system, f0 is the resonant frequency, L is the inductance of the arc suppression coil, ω=2πf0, U is the measured voltage value, I C is the capacitive current of the power supply system.

[0105] For example, when the target measurement strategy is to inject the power frequency signal strategy, the neutral point voltage before the current injection is measured Neutral point voltage after current injection and the injected current signal The capacitor current is calculated using the following formula:

[0106]

[0107] in, φ in is the neutral point phase before injecting the current signal, φ Δ The neutral point shift phase when the current signal is injected can be measured during measurement. The neutral point behavior before the current signal is injected and the neutral point shift phase when the current signal is injected can be measured. This application will not elaborate on this.

[0108] From the above, it can be seen that the embodiment of the present application provides a method for measuring the capacitive current of the power supply system by determining the grounding type of the power supply system and then determining the target measurement strategy corresponding to the grounding type. It is possible to obtain the measurement strategy that is most suitable for the power supply system, and then accurately measure the capacitive current of the power supply system, thereby ensuring the operational safety and reliability of the power supply network.

[0109] See also Figure 2 In one embodiment of the present application, the capacitance current measurement method of the power supply system further includes the following steps after S103:

[0110] S104: Determine whether the measured capacitance current is greater than a preset safety threshold;

[0111] S105: If the measured capacitor current is greater than a preset safety threshold, an alarm message is generated.

[0112] In the embodiment of the present application, the above-mentioned preset safety threshold can be set based on the actual situation of the power supply network, and the present application does not impose any restrictions on this.

[0113] In an embodiment of the present application, the above-mentioned alarm information is used to remind the grid maintenance personnel that the capacitive current of the power supply system is too large and certain protective measures need to be taken, such as connecting an arc suppression coil (if the arc suppression coil has been connected, the number of turns of the coil can be increased to better release the capacitive current), etc., to avoid the occurrence of safety accidents.

[0114] Figure 3 This is a schematic diagram of the structure of a terminal device provided in one embodiment of the present application. Figure 3 As shown, the above-mentioned terminal device includes:

[0115] The acquisition unit 301 is used to acquire the grounding type of the power supply system;

[0116] The determining unit 302 is configured to determine a target measurement strategy according to a grounding type of the power supply system;

[0117] The measuring unit 303 is configured to measure the capacitive current of the power supply system based on the target measurement strategy.

[0118] In one embodiment of the present application, the above-mentioned determination unit may include a first determination unit and a second determination unit.

[0119] The first determining unit is specifically configured to determine a preliminary measurement strategy according to a grounding type of the power supply system;

[0120] The second determining unit is specifically configured to determine a target measurement strategy according to the ground capacitance value obtained by measuring the preliminary measurement strategy.

[0121] In one embodiment of the present application, when the grounding type of the power supply system is a neutral point ungrounded system, the preliminary measurement strategy includes a three-frequency signal injection strategy and a divided-frequency signal injection strategy; accordingly, the second determination unit is used to determine that the target measurement strategy is a divided-frequency signal injection strategy if the measured capacitance to ground is greater than a preset capacitance threshold; if the measured capacitance to ground is not greater than the preset capacitance threshold, the target measurement strategy is determined to be a three-frequency signal injection strategy.

[0122] In one embodiment of the present application, when the grounding type of the power supply system is a neutral point arc suppression coil grounding system, the preliminary measurement strategy includes an injection variable frequency signal strategy and an injection power frequency signal strategy; accordingly, the second determination unit is used to determine that the target measurement strategy is an injection power frequency signal strategy if the measured capacitance to the ground is greater than a preset capacitance threshold; if the measured capacitance to the ground is greater than the preset capacitance threshold, determine that the target measurement strategy is an injection variable frequency signal strategy.

[0123] In one embodiment of the present application, the terminal device further includes a judgment unit and an alarm unit.

[0124] The judging unit is used to judge whether the measured capacitance current is greater than a preset safety threshold;

[0125] The alarm unit is used to generate an alarm message if the measured capacitive current is greater than a preset safety threshold.

[0126] From the above, it can be seen that a terminal device provided in an embodiment of the present application can also measure the capacitive current of the power supply system by determining the grounding type of the power supply system, and then determining the target measurement strategy corresponding to the grounding type. It can obtain the measurement strategy that is most suitable for the power supply system, and then accurately measure the capacitive current of the power supply system, thereby ensuring the operational safety and reliability of the power supply network.

[0127] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of this application. Their specific functions and technical effects can be found in the method embodiment section and will not be repeated here.

[0128] Figure 4 This is a schematic diagram of the structure of a terminal device provided in one embodiment of the present application. Figure 4 As shown, the terminal device 4 of this embodiment includes: at least one processor 40 ( Figure 4 Only one is shown in the figure) a processor, a memory 41, and a computer program 42 stored in the memory 41 and executable on the at least one processor 40. When the processor 40 executes the computer program 42, the steps of any one of the above-mentioned embodiments of the method for measuring capacitance current of a power supply system are implemented.

[0129] Those skilled in the art will understand that Figure 4 It is only an example of the terminal device 4 and does not constitute a limitation on the terminal device 4. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, it may also include input and output devices, network access devices, etc.

[0130] The processor 40 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor may be a microprocessor or any conventional processor.

[0131] In some embodiments, the memory 41 may be an internal storage unit of the terminal device 4, such as a hard disk or memory of the terminal device 4. In other embodiments, the memory 41 may also be an external storage device of the terminal device 4, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the terminal device 4. Furthermore, the memory 41 may also include both an internal storage unit and an external storage device of the terminal device 4. The memory 41 is used to store an operating system, an application program, a boot loader, data, and other programs, such as the program code of the computer program. The memory 41 may also be used to temporarily store data that has been output or is to be output.

[0132] An embodiment of the present application further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the steps of any one of the above-mentioned embodiments of the method for measuring capacitance current of a power supply system can be implemented.

[0133] An embodiment of the present application provides a computer program product. When the computer program product is run on a terminal device, the terminal device implements the steps of any one of the above-mentioned embodiments of the capacitance current measurement method for a power supply system.

[0134] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of this application. Their specific functions and technical effects can be found in the method embodiment section and will not be repeated here.

[0135] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0136] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0137] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0138] In the embodiments provided in the present application, it should be understood that the disclosed method for measuring the capacitance current of the power supply system can be implemented in other ways. For example, the device / server embodiment described above is only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0139] The units described as separate components may or may not be physically separate, and 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 network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0140] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A method for measuring capacitance current of a power supply system, characterized in that: Power supply systems used in mining areas include: obtaining a grounding type of the power supply system according to a grounding record of the power supply system; determining a target measurement strategy according to the grounding type of the power supply system; Wherein, determining the target measurement strategy according to the grounding type of the power supply system includes: determining a preliminary measurement strategy based on the grounding type of the power supply system; Determining a target measurement strategy based on the capacitance to ground measured by the preliminary measurement strategy; measuring a capacitive current of the power supply system based on the target measurement strategy; Wherein, when the grounding type of the power supply system is a neutral point ungrounded system, the preliminary measurement strategy includes a three-frequency signal injection strategy and a divided-frequency signal injection strategy; When the grounding type of the power supply system is a neutral point arc suppression coil grounding system, the preliminary measurement strategy includes injecting a variable frequency signal strategy and injecting a power frequency signal strategy; Determining the target measurement strategy according to the capacitance to ground obtained by the preliminary measurement strategy includes: If the measured capacitance to ground is greater than a preset capacitance threshold, determining that the target measurement strategy is a frequency division signal injection strategy; If the measured capacitance to ground is not greater than the preset capacitance threshold, the target measurement strategy is determined to be the three-frequency signal injection strategy; Determining the target measurement strategy according to the capacitance to ground obtained by the preliminary measurement strategy includes: If the measured capacitance to ground is greater than a preset capacitance threshold, determining that the target measurement strategy is a power frequency signal injection strategy; If the measured capacitance to ground is greater than a preset capacitance threshold, it is determined that the target measurement strategy is the variable frequency signal injection strategy.

2. The method for measuring capacitance current of a power supply system according to claim 1, wherein: After measuring the capacitive current of the power supply system based on the target measurement strategy, the method further includes: Determine whether the measured capacitance current is greater than a preset safety threshold; If the measured capacitance current is greater than the preset safety threshold, an alarm message is generated.

3. A terminal device, characterized in that: Power supply systems used in mining areas include: an acquiring unit, configured to acquire a grounding type of the power supply system according to a grounding record of the power supply system; a determining unit, configured to determine a target measurement strategy according to a grounding type of the power supply system; a measuring unit, configured to measure a capacitive current of the power supply system based on the target measurement strategy; Wherein, the determining unit includes a first determining unit and a second determining unit; The first determining unit is configured to determine a preliminary measurement strategy according to a grounding type of the power supply system; The second determining unit is configured to determine a target measurement strategy according to the capacitance to ground measured by the preliminary measurement strategy; When the grounding type of the power supply system is a neutral point ungrounded system, the preliminary measurement strategy includes a three-frequency signal injection strategy and a divided-frequency signal injection strategy; accordingly, the second determination unit is used to determine that the target measurement strategy is a divided-frequency signal injection strategy if the measured capacitance to ground is greater than a preset capacitance threshold; if the measured capacitance to ground is not greater than the preset capacitance threshold, the target measurement strategy is determined to be a three-frequency signal injection strategy; When the grounding type of the power supply system is a neutral point arc suppression coil grounding system, the preliminary measurement strategy includes an injection variable frequency signal strategy and an injection power frequency signal strategy; accordingly, the second determination unit is used to determine that the target measurement strategy is the injection power frequency signal strategy if the measured capacitance to the ground is greater than the preset capacitance threshold; if the measured capacitance to the ground is greater than the preset capacitance threshold, determine that the target measurement strategy is the injection variable frequency signal strategy.

4. A terminal device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the capacitance current measurement method of the power supply system according to claim 1 or 2 are implemented.

5. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the capacitance current measurement method of the power supply system according to claim 1 or 2 are implemented.

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