Power grid grounding fault detection method and device, computer device and storage medium

Abstract

The application relates to a power grid grounding fault detection method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring voltage detection data of a target power utilization device and output voltage of a power grid; performing voltage difference calculation on the power grid according to the voltage detection data and the output voltage to obtain a first power grid voltage difference; the first power grid voltage difference is the voltage difference between the ground wire and the neutral wire in the power grid; determining the target grounding voltage of the power utilization device according to the first power grid voltage difference and the voltage detection data; and determining the grounding fault detection result of the power grid based on the target grounding voltage and a grounding voltage threshold. The method can calculate the target grounding voltage of the power utilization device, compare the target grounding voltage with the grounding voltage threshold to determine whether the grounding is normal, can enable the staff to quickly find potential safety hazards, prevent the fault from expanding, and thus ensure the continuous and stable operation of the power system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power grid fault detection, in particular to a power grid grounding fault detection method and device, computer equipment and storage medium. BACKGROUND

[0002] In the power system, good wiring of the ground wire is crucial to ensure power safety. It can introduce current into the ground when electrical equipment fails such as leakage, avoiding electric shock and equipment damage. In practical applications, a reliable method is needed to detect whether the ground wire is well wired. In a single-phase power grid, the detection method is relatively easy to determine due to the relatively simple circuit structure. However, with the development of the power system, three-phase power grids are increasingly widely used, and their circuit structure is more complex, facing special scenarios such as power grid imbalance, which brings new challenges to ground wire wiring detection.

[0003] In related technologies, for the detection of whether the ground wire is well wired, the method of directly detecting the voltage of the N line to ground is generally used. In a single-phase power grid environment, this method is simple and effective. Because the single-phase power grid structure is relatively stable, the basic voltage of the N line (neutral line) is usually 0, and when the N line voltage is detected to be greater than the safe voltage, it can be relatively clear that the ground wire wiring is abnormal. However, three-phase power grids are prone to power imbalance scenarios. When the power grid is unbalanced, the basic voltage of the N line is no longer 0. At this time, N line-to-ground voltage detection will introduce the voltage generated during imbalance into the detection result, seriously affecting the judgment of whether the ground wire is well wired. This interference can lead to misjudgment, thus failing to accurately ensure power safety, and bringing potential risks to the stable operation of the power system and personnel safety. SUMMARY

[0004] Therefore, it is necessary to provide a power grid grounding fault detection method, device, computer equipment, computer readable storage medium and computer program product that can accurately detect grounding conditions and avoid misjudgment and false alarm by detecting and analyzing the voltage of multiple points in the power grid.

[0005] In a first aspect, the present application provides a power grid grounding fault detection method. The method comprises:

[0006] obtaining voltage detection data of a target power consumption device and output voltage of a power grid;

[0007] performing voltage difference calculation on the power grid according to the voltage detection data and the output voltage to obtain a first power grid voltage difference; the first power grid voltage difference is the voltage difference between the ground wire and the neutral line in the power grid;

[0008] determining a target grounding voltage of the power consumption device according to the first power grid voltage difference and the voltage detection data;

[0009] Based on the target grounding voltage and the grounding voltage threshold, a grounding fault detection result of the power grid is determined.

[0010] In one of the embodiments, a voltage difference calculation is performed on the power grid according to the voltage detection data and the output voltage, to obtain a first power grid voltage difference, including:

[0011] A phase angle of the power grid is calculated according to the voltage detection data, to obtain a target power grid phase angle; the target power grid phase angle is a phase angle between a hot line and a neutral line in the power grid;

[0012] A voltage difference of the power grid is calculated according to the output voltage, the target power grid phase angle and the voltage detection data, to obtain the first power grid voltage difference.

[0013] In one of the embodiments, a voltage difference of the power grid is calculated according to the output voltage, the target power grid phase angle and the voltage detection data, to obtain the first power grid voltage difference, including:

[0014] A voltage vector relationship of the power grid is constructed based on the target power grid phase angle; the voltage vector relationship is a vector relationship constructed based on characteristics of voltages in the power grid in a vector form, a horizontal direction of a voltage vector diagram is a direction of a vector corresponding to the output voltage, and the output voltage is a voltage difference between the hot line and the ground line in the power grid;

[0015] A second power grid voltage difference of the power grid is determined based on the voltage detection data; the second power grid voltage difference is a voltage difference between the hot line and the neutral line in the power grid;

[0016] The first power grid voltage difference is obtained by calculation according to the voltage vector relationship and the second power grid voltage difference.

[0017] In one of the embodiments, a target grounding voltage of the power-using equipment is determined according to the first power grid voltage difference and the voltage detection data, including:

[0018] A voltage difference calculation is performed on the power-using equipment according to the voltage detection data, to obtain a first equipment voltage difference; the first equipment voltage difference is a voltage difference between a ground line and a neutral line in the power-using equipment;

[0019] The target grounding voltage of the power-using equipment is determined according to the first power grid voltage difference, the first equipment voltage difference and a neutral line transmission voltage drop; the neutral line transmission voltage drop is a voltage difference between a neutral line connection point of the power grid and a neutral line connection point of the power-using equipment.

[0020] In one of the embodiments, a grounding fault detection result of the power grid is determined based on the target grounding voltage and a grounding voltage threshold, including:

[0021] In a case where the target grounding voltage does not exceed the grounding voltage threshold, the grounding fault detection result is determined as normal loop grounding of the power grid;

[0022] In a case where the target grounding voltage exceeds the grounding voltage threshold, the grounding fault detection result is determined as abnormal loop grounding of the power grid.

[0023] In one of the embodiments, the method further comprises:

[0024] obtaining load conditions of neutral lines connected to the power grid by each of the electrical devices;

[0025] determining a target electrical device from all the electrical devices based on the load conditions; the target electrical device is an electrical device without load.

[0026] In a second aspect, the application further provides a power grid grounding fault detection device. The device comprises:

[0027] a data acquisition module configured to obtain voltage detection data of a target electrical device and output voltage of a power grid;

[0028] a data calculation module configured to perform voltage difference calculation on the power grid based on the voltage detection data and the output voltage to obtain a first power grid voltage difference; the first power grid voltage difference is a voltage difference between a ground wire and a neutral wire in the power grid;

[0029] the data calculation module is further configured to determine a target grounding voltage of the electrical device based on the first power grid voltage difference and the voltage detection data;

[0030] a detection analysis module configured to determine a grounding fault detection result of the power grid based on the target grounding voltage and a grounding voltage threshold.

[0031] In a third aspect, the application further provides a computer device. The computer device comprises a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0032] obtaining voltage detection data of a target electrical device and output voltage of a power grid;

[0033] performing voltage difference calculation on the power grid based on the voltage detection data and the output voltage to obtain a first power grid voltage difference; the first power grid voltage difference is a voltage difference between a ground wire and a neutral wire in the power grid;

[0034] determining a target grounding voltage of the electrical device based on the first power grid voltage difference and the voltage detection data;

[0035] determining a grounding fault detection result of the power grid based on the target grounding voltage and a grounding voltage threshold.

[0036] In a fourth aspect, the present application also provides a computer readable storage medium. The computer readable storage medium has a computer program stored thereon, and the computer program, when executed by a processor, implements the following steps:

[0037] obtaining voltage detection data of a target power utilization device and output voltage of a power grid;

[0038] performing voltage difference calculation on the power grid according to the voltage detection data and the output voltage to obtain a first power grid voltage difference; the first power grid voltage difference is a voltage difference between a ground wire and a neutral wire in the power grid;

[0039] determining a target grounding voltage of the power utilization device according to the first power grid voltage difference and the voltage detection data;

[0040] determining a grounding fault detection result of the power grid based on the target grounding voltage and a grounding voltage threshold.

[0041] In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program, and the computer program, when executed by a processor, implements the following steps:

[0042] obtaining voltage detection data of a target power utilization device and output voltage of a power grid;

[0043] performing voltage difference calculation on the power grid according to the voltage detection data and the output voltage to obtain a first power grid voltage difference; the first power grid voltage difference is a voltage difference between a ground wire and a neutral wire in the power grid;

[0044] determining a target grounding voltage of the power utilization device according to the first power grid voltage difference and the voltage detection data;

[0045] determining a grounding fault detection result of the power grid based on the target grounding voltage and a grounding voltage threshold.

[0046] The power grid grounding fault detection method, device, computer device, storage medium and computer program product described above, by using the obtained voltage detection data of a target power utilization device and output voltage of a power grid, calculate a first power grid voltage difference between a ground wire and a neutral wire in the power grid, and then combine the obtained first power grid voltage difference with the voltage detection data to further calculate a target grounding voltage of the power utilization device, and compare the target grounding voltage with a grounding voltage threshold to determine whether the grounding is normal, which can enable the staff to quickly find potential safety hazards to prevent the fault from expanding, and thus ensure the continuous and stable operation of the power system. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 An application environment diagram of the power grid grounding fault detection method in an embodiment;

[0048] Figure 2A flowchart of a power grid grounding fault detection method in an embodiment;

[0049] Figure 3 A structural diagram of a power grid connection in an embodiment;

[0050] Figure 4 A structural block diagram of a power grid grounding fault detection device in an embodiment;

[0051] Figure 5 An internal structural diagram of a computer device in an embodiment. DETAILED DESCRIPTION

[0052] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0053] The power grid grounding fault detection method provided by the embodiments of the present application can be applied in an application environment as shown in Figure 1 . The terminal 102 communicates with the server 104 through a network. The data storage system can store data required to be processed by the server 104. The data storage system can be integrated on the server 104, or placed on a cloud or other network server. After obtaining the voltage detection data of the target power consumption device and the output voltage of the power grid, the first power grid voltage difference between the ground wire and the neutral wire in the power grid is calculated by using the voltage detection data and the output voltage. Then, the target grounding voltage of the power consumption device is determined by calculating in combination with the first power grid voltage difference and the voltage detection data. Finally, the target grounding voltage is compared with the preset grounding voltage threshold, so as to obtain the grounding fault detection result of the power grid. The terminal 102 can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers and power grid data acquisition devices. The power grid data acquisition devices can be voltage sensors, electric energy meters, voltage transformers and distributed measurement and control units, etc. The server 104 can be realized by an independent server or a server cluster composed of multiple servers.

[0054] In an embodiment, as shown in Figure 2 , a power grid grounding fault detection method is provided. Taking the server in Figure 1 as an example, the method comprises the following steps:

[0055] Step 202, obtaining voltage detection data of a target power consumption device and output voltage of a power grid.

[0056] For example, after connecting electrical equipment to the power grid, for the target electrical equipment that needs to be tested, a suitable testing point is selected on the connection line between the target electrical equipment and the power grid, and a schematic diagram of the power grid wiring structure is constructed, such as... Figure 3 As shown. Figure 3 A simplified diagram of the power grid wiring. Figure 3 In the diagram, R1 is the impedance of the L line (live wire) of the power grid connection, R2 is the impedance of the N line (neutral wire) of the power grid connection, R3 is the grounding impedance, A is the detection point on the L line (live wire) of the power grid end, B is the detection point on the N line (neutral wire) of the power grid end, C is the detection point on the GND line (ground wire) of the power grid end, D is the detection point on the L line (live wire) of the equipment end, E is the detection point on the N line (neutral wire) of the equipment end, and F is the detection point on the PE line (ground wire) of the equipment end.

[0057] After determining the detection points, the voltage difference between the live wire and the ground wire, as well as the voltage difference between the ground wire and the neutral wire in the target electrical equipment, are measured to obtain voltage detection data. Simultaneously, the output voltage of the power grid is determined.

[0058] Step 204: Calculate the voltage difference of the power grid based on the voltage detection data and the output voltage to obtain the first power grid voltage difference; the first power grid voltage difference is the voltage difference between the ground wire and the neutral wire in the power grid.

[0059] For example, the voltage difference between the live wire and the ground wire in the target electrical equipment, and the voltage difference between the ground wire and the neutral wire, are used to calculate the output voltage. For example, the phase angle is calculated and the voltage relationship is determined based on the phase angle. Then, the voltage difference between the ground wire and the neutral wire is calculated, which is the first grid voltage difference. The obtained first grid voltage difference can be used to determine whether the overall voltage distribution of the power grid is normal.

[0060] Step 206: Determine the target grounding voltage of the electrical equipment based on the voltage difference of the first power grid and the voltage detection data.

[0061] For example, after obtaining the first grid voltage difference, combined with Figure 3 The voltage relationships between different parts of the circuit can be analyzed and calculated. For example, the phase angle mentioned above can be used to determine the voltage vector relationship in order to obtain the target ground voltage of the electrical equipment. Figure 3 The voltage difference between monitoring point C and detection point F.

[0062] Step 208: Determine the ground fault detection result of the power grid based on the target ground voltage and the ground voltage threshold.

[0063] Exemplarily, the target ground voltage is compared with a ground voltage threshold to obtain a power grid ground fault detection result. If the target ground voltage is within the threshold normal range, it indicates that the power grid grounding is good and there is no obvious fault; if it exceeds the threshold, it indicates that the grounding is abnormal, and there may be problems such as three-phase imbalance, excessive ground impedance, etc., which need to be promptly investigated and maintained to ensure the safe operation of the power grid.

[0064] In the above power grid ground fault detection method, the voltage detection data of the target power equipment and the output voltage of the power grid are used to calculate the first power grid voltage difference between the ground wire and the neutral wire in the power grid, and then the obtained first power grid voltage difference is combined with the voltage detection data to further calculate the target ground voltage of the power equipment, and the target ground voltage is compared with the ground voltage threshold to determine whether the grounding is normal. This can enable the staff to quickly discover potential safety hazards to prevent the expansion of faults and thus ensure the continuous and stable operation of the power system.

[0065] In one embodiment, the voltage difference of the power grid is calculated according to the voltage detection data and the output voltage to obtain the first power grid voltage difference, including:

[0066] The phase angle of the power grid is calculated according to the voltage detection data to obtain the target power grid phase angle; the target power grid phase angle is the phase angle between the firewire and the neutral wire in the power grid; the voltage difference of the power grid is calculated according to the output voltage, the target power grid phase angle and the voltage detection data to obtain the first power grid voltage difference.

[0067] Exemplarily, after obtaining the voltage detection data, the phase angle between the firewire and the neutral wire in the power grid is calculated using the voltage detection data, i.e. the phase angle is calculated using the voltage difference between the firewire and the ground wire in the target power equipment and the voltage difference between the ground wire and the neutral wire. The specific calculation method of the phase angle is as follows:

[0068]

[0069] wherein, is the voltage difference between the D detection point and the F detection point, is the voltage difference between the E detection point and the F detection point, is the voltage difference between the D detection point and the E detection point.

[0070] The above formula can obtain , which is as follows:

[0071]

[0072] Then the inverse cosine function is used to obtain the phase angle , i.e. the target power grid phase angle.

[0073] Then, the first grid voltage difference is calculated according to the output voltage, the target grid phase angle and the voltage detection data.

[0074] In one embodiment, the voltage difference of the grid is calculated according to the output voltage, the target grid phase angle and the voltage detection data, and the first grid voltage difference is obtained, including:

[0075] The voltage vector relationship of the grid is constructed based on the target grid phase angle; the voltage vector relationship is a vector relationship constructed based on the characteristics of the voltage in the grid in the form of a vector, the horizontal direction of the voltage vector diagram is the direction of the output voltage corresponding vector, and the output voltage is the voltage difference between the fire line and the ground line in the grid; the second grid voltage difference of the grid is determined based on the voltage detection data; the second grid voltage difference is the voltage difference between the fire line and the neutral line in the grid; and the first grid voltage difference is obtained by calculation according to the voltage vector relationship and the second grid voltage difference.

[0076] Exemplarily, since the voltage in the grid has a size and a direction, which meets the characteristics of a vector, the voltage in the grid can be represented by a vector. In this embodiment, the direction of the output voltage corresponding vector is taken as the horizontal direction of the voltage vector diagram, and thus the size and the phase relationship of each voltage in the grid can be intuitively displayed in the vector diagram in combination with the target grid phase angle.

[0077] Then, it is determined that the voltage difference between the D detection point and the F detection point, the voltage difference between the E detection point and the F detection point, and the voltage difference between the A detection point and the B detection point have a relationship on a vector, specifically:

[0078]

[0079] Wherein, is the voltage difference between the A detection point and the B detection point.

[0080] Further, the voltage difference between the A detection point and the B detection point is obtained, and the voltage difference between the A detection point and the C detection point, i.e. the output voltage, is generally constant, which is 230Vac by default in this embodiment, and thus the voltage difference between the B detection point and the C detection point, i.e. the first grid voltage difference, is calculated.

[0081] In one embodiment, the target grounding voltage of the power utilization equipment is determined according to the first grid voltage difference and the voltage detection data, including:

[0082] The voltage difference of the electrical equipment is calculated based on the voltage detection data to obtain the first equipment voltage difference; the first equipment voltage difference is the voltage difference between the ground wire and the neutral wire in the electrical equipment; the target grounding voltage of the electrical equipment is determined based on the first grid voltage difference, the first equipment voltage difference, and the neutral wire transmission voltage drop; the neutral wire transmission voltage drop is the voltage difference between the neutral wire connection point of the grid and the neutral wire connection point of the electrical equipment.

[0083] For example, by means of Figure 3 Analysis of the power grid wiring diagram shows that the sum of the voltage differences between detection points B and C and between detection points E and F is equal to the sum of the voltage differences between detection points B and E and between detection points C and F. The voltage difference between detection points B and E is due to the impedance of the neutral cable between the target electrical equipment and the power grid. In one embodiment, the target electrical equipment is an unloaded device, determined through the following steps:

[0084] Obtain the load status of the neutral line connecting each electrical device to the power grid; based on the load status, determine the target electrical device from all electrical devices.

[0085] That is, there are no other loads between the target electrical equipment and the neutral line connection point of the power grid, except for the line itself.

[0086] Meanwhile, since the neutral line between the target electrical equipment and the power grid has a small impedance, it can be considered that there is no load, that is, the voltage difference between detection point B and detection point E is zero.

[0087] The voltage difference between detection point C and detection point F is equal to the sum of the voltage differences between detection points B and C and between detection points E and F. In other words, the voltage difference between detection points C and F is the target grounding voltage of the electrical equipment.

[0088] In one embodiment, determining the ground fault detection result of the power grid based on the target ground voltage and the ground voltage threshold includes:

[0089] If the target ground voltage does not exceed the ground voltage threshold, the ground fault detection result is determined to be that the power grid's loop grounding is normal; if the target ground voltage exceeds the ground voltage threshold, the ground fault detection result is determined to be that the power grid's loop grounding is abnormal.

[0090] For example, the target ground voltage is compared with a preset ground voltage threshold, such as:

[0091] The target grounding voltage is calculated by using the target grounding voltage and the grounding voltage threshold value, so as to obtain a ratio result. If the ratio result is less than 1, it indicates that the grounding fault detection result is that the loop grounding of the power grid is normal. Otherwise, the loop grounding of the power grid is abnormal.

[0092] In an exemplary embodiment, a power grid grounding fault detection method is provided, which comprises the following steps:

[0093] Obtain the load conditions of the neutral lines connected with the power grid of each electrical equipment.

[0094] Determine a target electrical equipment from all electrical equipment based on the load conditions; the target electrical equipment is an electrical equipment without load.

[0095] Obtain voltage detection data of the target electrical equipment and output voltage of the power grid.

[0096] Calculate the phase angle of the power grid according to the voltage detection data to obtain a target power grid phase angle; the target power grid phase angle is the phase angle between the fire line and the neutral line in the power grid.

[0097] Construct a voltage vector relationship of the power grid based on the target power grid phase angle; the voltage vector relationship is a vector relationship constructed based on the characteristics of the voltage in the power grid in the form of a vector, and the horizontal direction of the voltage vector diagram is the direction of the output voltage corresponding vector, and the output voltage is the voltage difference between the fire line and the ground line in the power grid.

[0098] Determine a second power grid voltage difference of the power grid based on the voltage detection data; the second power grid voltage difference is the voltage difference between the fire line and the neutral line in the power grid.

[0099] Calculate according to the voltage vector relationship and the second power grid voltage difference to obtain a first power grid voltage difference; the first power grid voltage difference is the voltage difference between the ground line and the neutral line in the power grid.

[0100] Calculate the voltage difference of the electrical equipment according to the voltage detection data to obtain a first equipment voltage difference; the first equipment voltage difference is the voltage difference between the ground line and the neutral line in the electrical equipment.

[0101] Determine the target grounding voltage of the electrical equipment according to the first power grid voltage difference, the first equipment voltage difference and the neutral line transmission voltage drop; the neutral line transmission voltage drop is the voltage difference between the neutral line connection point of the power grid and the neutral line connection point of the electrical equipment.

[0102] In the case that the target grounding voltage does not exceed the grounding voltage threshold value, it is determined that the grounding fault detection result is that the loop grounding of the power grid is normal.

[0103] In the case that the target grounding voltage exceeds the grounding voltage threshold value, it is determined that the grounding fault detection result is that the loop grounding of the power grid is abnormal.

[0104] It should be understood that although the steps in the flowcharts involved in the embodiments described above are shown in sequence according to the arrows, the steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, the execution of the steps is not strictly limited in sequence, and the steps can be executed in other sequences. Moreover, at least some of the steps in the flowcharts involved in the embodiments described above can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of the steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0105] Based on the same inventive concept, the embodiments of the present application also provide a power grid grounding fault detection device for implementing the power grid grounding fault detection method described above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more power grid grounding fault detection device embodiments provided below can refer to the limitations of the power grid grounding fault detection method described above, which will not be repeated here.

[0106] In one embodiment, as shown in FIG. 4, a power grid grounding fault detection device is provided, comprising a data acquisition module 402, a data calculation module 404 and a detection analysis module 406, wherein: Figure 4 The data acquisition module 402 is configured to acquire voltage detection data of a target power consumption device and output voltage of a power grid.

[0107] The data calculation module 404 is configured to calculate a voltage difference of the power grid according to the voltage detection data and the output voltage to obtain a first power grid voltage difference; the first power grid voltage difference is a voltage difference between a ground wire and a neutral wire in the power grid.

[0108] The data calculation module 404 is further configured to determine a target grounding voltage of the power consumption device according to the first power grid voltage difference and the voltage detection data.

[0109] The detection analysis module 406 is configured to determine a grounding fault detection result of the power grid based on the target grounding voltage and a grounding voltage threshold.

[0110] In one embodiment, the data calculation module 404 is further configured to calculate a phase angle of the power grid according to the voltage detection data to obtain a target power grid phase angle; the target power grid phase angle is a phase angle between a fire wire and a neutral wire in the power grid; and calculate a voltage difference of the power grid according to the output voltage, the target power grid phase angle and the voltage detection data to obtain the first power grid voltage difference.

[0111] In one embodiment, the data calculation module 404 is further configured to calculate a phase angle of the power grid according to the voltage detection data to obtain a target power grid phase angle; the target power grid phase angle is a phase angle between a fire wire and a neutral wire in the power grid; and calculate a voltage difference of the power grid according to the output voltage, the target power grid phase angle and the voltage detection data to obtain the first power grid voltage difference.

[0112] In an embodiment, the data calculation module 404 is further configured to construct a voltage vector relationship of the power grid based on the target power grid phase angle; the voltage vector relationship is a vector relationship constructed based on characteristics of voltage in the power grid represented in a vector form; a horizontal direction of the voltage vector diagram is a direction of an output voltage corresponding vector; the output voltage is a voltage difference between a fire line and a ground line in the power grid; determine a second power grid voltage difference of the power grid based on the voltage detection data; the second power grid voltage difference is a voltage difference between a fire line and a neutral line in the power grid; and calculate the first power grid voltage difference according to the voltage vector relationship and the second power grid voltage difference.

[0113] In an embodiment, the data calculation module 404 is further configured to calculate a voltage difference of the power-using equipment according to the voltage detection data to obtain a first equipment voltage difference; the first equipment voltage difference is a voltage difference between a ground line and a neutral line in the power-using equipment; determine a target ground voltage of the power-using equipment according to the first power grid voltage difference, the first equipment voltage difference and a neutral line transmission voltage drop; the neutral line transmission voltage drop is a voltage difference between a neutral line connection point of the power grid and a neutral line connection point of the power-using equipment.

[0114] In an embodiment, the detection analysis module 406 is further configured to determine that the ground fault detection result is that the loop grounding of the power grid is normal when the target ground voltage does not exceed the ground voltage threshold; and determine that the ground fault detection result is that the loop grounding of the power grid is abnormal when the target ground voltage exceeds the ground voltage threshold.

[0115] In an embodiment, the data acquisition module 402 is further configured to acquire load conditions of neutral lines connected with each power-using equipment and the power grid; determine a target power-using equipment from all power-using equipment based on each load condition; and the target power-using equipment is a power-using equipment without load.

[0116] Each module in the above power grid ground fault detection device can be realized by software, hardware and combinations thereof in whole or in part. Each module described above can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a memory in a computer device in software form, so as to be called and executed by a processor to perform operations corresponding to each module.

[0117] In an embodiment, a computer device is provided, which can be a server, and an internal structure diagram of the computer device can be as shown in Figure 5As shown in the figure. The computer device includes a processor, a memory, an input / output interface (I / O for short) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through the system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capability. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store voltage data. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals through network connection. The computer program is executed by the processor to implement a power grid grounding fault detection method.

[0118] Those skilled in the art can understand that, Figure 5 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0119] In one embodiment, a computer device is also provided, including a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps in each of the above method embodiments.

[0120] In one embodiment, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to implement the steps in each of the above method embodiments.

[0121] In one embodiment, a computer program product is provided, including a computer program, and the computer program is executed by a processor to implement the steps in each of the above method embodiments.

[0122] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant laws, regulations and standards of relevant countries and regions.

[0123] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0124] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0125] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for detecting power grid grounding faults, characterized in that, The method includes: Acquire voltage detection data of the target electrical equipment and the output voltage of the power grid; the output voltage is the voltage difference between the live wire and the ground wire in the power grid. Based on the voltage detection data and the output voltage, the voltage difference of the power grid is calculated to obtain a first power grid voltage difference; the first power grid voltage difference is the voltage difference between the ground wire and the neutral wire in the power grid. Based on the voltage difference of the first power grid and the voltage detection data, the target grounding voltage of the electrical equipment is determined; the target grounding voltage is the voltage difference between the ground wire of the power grid and the ground wire of the electrical equipment. Based on the target grounding voltage and the grounding voltage threshold, the grounding fault detection result of the power grid is determined; The step of calculating the voltage difference of the power grid based on the voltage detection data and the output voltage to obtain the first power grid voltage difference includes: calculating the phase angle of the power grid based on the voltage detection data to obtain the target power grid phase angle; the target power grid phase angle is the phase angle between the live wire and the neutral wire in the power grid; and calculating the voltage difference of the power grid based on the output voltage, the target power grid phase angle, and the voltage detection data to obtain the first power grid voltage difference.

2. The method according to claim 1, characterized in that, The step of calculating the voltage difference of the power grid based on the output voltage, the target power grid phase angle, and the voltage detection data to obtain the first power grid voltage difference includes: The voltage vector relationship of the power grid is constructed based on the phase angle of the target power grid; the voltage vector relationship is a vector relationship constructed based on the characteristic that the voltage in the power grid is represented in vector form, the horizontal direction of the voltage vector diagram is the direction of the vector corresponding to the output voltage, and the output voltage is the voltage difference between the live wire and the ground wire in the power grid; The second grid voltage difference is determined based on the voltage detection data; the second grid voltage difference is the voltage difference between the live wire and the neutral wire in the grid. The first grid voltage difference is obtained by calculating based on the voltage vector relationship and the second grid voltage difference.

3. The method according to claim 1, characterized in that, The step of determining the target grounding voltage of the electrical equipment based on the first grid voltage difference and the voltage detection data includes: The voltage difference of the electrical equipment is calculated based on the voltage detection data to obtain the first equipment voltage difference; the voltage detection data includes the grounding voltage and neutral voltage of the electrical equipment, and the first equipment voltage difference is the voltage difference between the grounding wire and the neutral wire in the electrical equipment. The target grounding voltage of the electrical equipment is determined based on the first grid voltage difference, the first equipment voltage difference, and the neutral line transmission voltage drop; the neutral line transmission voltage drop is the voltage difference between the neutral line connection point of the grid and the neutral line connection point of the electrical equipment.

4. The method according to claim 1, characterized in that, The determination of the ground fault detection result of the power grid based on the target ground voltage and the ground voltage threshold includes: If the target ground voltage does not exceed the ground voltage threshold, the ground fault detection result is determined to be that the circuit grounding of the power grid is normal. If the target ground voltage exceeds the ground voltage threshold, the ground fault detection result is determined to be a loop grounding anomaly in the power grid.

5. The method according to claim 1, characterized in that, The method further includes: Obtain the load status of the neutral line connecting each electrical device to the power grid; The target electrical device is determined from all the electrical devices based on the load conditions described above; the target electrical device is an electrical device without load.

6. A power grid grounding fault detection device, characterized in that, The device includes: The data acquisition module is used to acquire voltage detection data of the target electrical equipment and the output voltage of the power grid; the output voltage is the voltage difference between the live wire and the ground wire in the power grid. The data calculation module is used to calculate the voltage difference of the power grid based on the voltage detection data and the output voltage to obtain a first power grid voltage difference; the first power grid voltage difference is the voltage difference between the ground wire and the neutral wire in the power grid; it is also used to calculate the phase angle of the power grid based on the voltage detection data to obtain a target power grid phase angle; the target power grid phase angle is the phase angle between the live wire and the neutral wire in the power grid; and to calculate the voltage difference of the power grid based on the output voltage, the target power grid phase angle, and the voltage detection data to obtain the first power grid voltage difference. The data calculation module is further configured to determine the target grounding voltage of the electrical equipment based on the first grid voltage difference and the voltage detection data; the target grounding voltage is the voltage difference between the ground wire of the grid and the ground wire of the electrical equipment. The detection and analysis module is used to determine the ground fault detection result of the power grid based on the target ground voltage and the ground voltage threshold.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

9. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

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