A method and system for testing misconnection of neutral and ground wires

Abstract

The present application relates to the technical field of power testing, and in particular to a method and system for testing the misconnection of a neutral ground line. The testing module generates load information on the user's indoor line within a preset test period, and the monitoring module monitors the zero-sequence current and the zero-sequence current occurrence time of the user's access line within the preset test period. According to whether the target zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the target zero-sequence current occurrence time is consistent with the load current occurrence time, it is judged whether the neutral ground line of the user line is misconnected. The present application has the effect of quickly and accurately identifying the phenomenon of misconnection of the neutral ground line.

Description

Technical Field

[0001] The present application relates to the technical field of power testing, and in particular to a method and system for testing misconnection of a neutral line and a ground line. Background Art

[0002] With the development of society and the improvement of people's living standards, new residential communities are constantly put into operation in various places. In order to reduce irregularities or errors caused by construction, new residential communities will have various acceptance inspections before they are put into operation. The so-called acceptance inspection of new residential communities for power companies is to inspect the eligibility of power distribution in the substation area. The substation area refers to the power supply range or area of ​​a transformer, and a residential community contains multiple substation areas.

[0003] In the related technology, a tester is often used to detect the user's indoor lines during the power acceptance in a newly built community. However, no company has yet made a product that can be implemented for the situation where the neutral wire and the ground wire are connected reversely, and the reverse connection of the neutral wire and the ground wire is often accompanied by greater safety hazards.

[0004] The incorrect connection of the neutral wire and the ground wire makes it impossible to install leakage protection in the user's home, which is relatively easy to find. However, if the neutral wire and the ground wire are mistakenly connected to the leakage protection at the leakage protection point, the user can use electricity normally and the leakage protection can also work normally. It is difficult to check and find during acceptance, and it is also difficult for users to find it, but it makes it impossible to install leakage protection at the front end of the meter.

[0005] Common grounding systems in substations include TT, TN-C and IT systems. The national standard "Installation and Operation of Residual Current Operated Protective Devices GB / T13955" stipulates that electrical lines or electrical equipment in low-voltage substation TT systems should be equipped with leakage protectors. After the TN-C system is transformed into the TN-CS and TN-S systems, leakage protectors should be installed at the part where the N line and PE line are separated. Electrical lines or electrical equipment in the IT system should be equipped with leakage protectors. When a user's neutral ground is connected incorrectly, its load current is equal to the leakage current, which causes the upper-level leakage protector installed in the substation to frequently trip and fail to operate normally, causing the upper-level leakage protector in the substation to lose its leakage protection function, and there are great safety hazards in the use of electricity in the substation. Summary of the invention

[0006] In order to quickly and accurately identify the phenomenon of neutral-ground wire misconnection, the present application provides a neutral-ground wire misconnection testing method and system.

[0007] In the first aspect, the present application provides a method for testing a neutral-ground line misconnection, which adopts the following technical solution:

[0008] A method for testing a neutral-ground line misconnection, comprising:

[0009] During the preset test period, load information is generated on the user's indoor line;

[0010] During the preset test period, monitoring the zero-sequence current of the user access line and the zero-sequence current occurrence time;

[0011] Whether the zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the target zero-sequence current occurrence time is consistent with the actual load current occurrence time, it is determined whether the neutral ground line of the user line is connected incorrectly.

[0012] In some embodiments, whether the target zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the occurrence time is consistent, and whether the zero-ground line of the user line is wrongly connected, include the following steps:

[0013] Producing a zero-fire load on the user's indoor line;

[0014] Within the preset test period, detecting the zero-fire load zero-sequence current on the user access line;

[0015] Determine whether the actual zero-fire load current is consistent with the target zero-fire load zero-sequence current, and whether the actual zero-fire load current occurrence time is consistent with the target zero-fire load zero-sequence current occurrence time;

[0016] If the actual zero-fire load current is consistent with the target zero-fire load zero-sequence current, and the actual zero-fire load current occurrence time is consistent with the target zero-fire load zero-sequence current occurrence time, it is determined that the zero-ground wire connection on the line in the user's household is wrong;

[0017] The actual zero-fire load current is included in the actual load current, and the target zero-fire load zero-sequence current is included in the target zero-sequence current.

[0018] In some embodiments, if the actual zero-fire load current is inconsistent with the target zero-fire load zero-sequence current, or the actual zero-fire load current occurrence time is inconsistent with the target zero-fire load zero-sequence current occurrence time, the following steps are also included:

[0019] generating a ground load on the user's indoor line;

[0020] During the preset test period, detecting the zero-sequence current of the power-to-ground load on the user access line;

[0021] Determine whether the actual fire ground load current is consistent with the target fire ground load zero sequence current, and whether the occurrence time of the actual fire ground load current is consistent with the occurrence time of the target fire ground load zero sequence current;

[0022] If the actual fire-ground load current is consistent with the target fire-ground load zero-sequence current, and the occurrence time of the actual fire-ground load current is consistent with the occurrence time of the target fire-ground load zero-sequence current, it is determined that the zero-ground connection of the user line is correct;

[0023] The actual fire-ground load current is included in the actual load current; and the target fire-ground load zero-sequence current is included in the target zero-sequence current.

[0024] In a second aspect, the present application provides a neutral-ground line misconnection test system, which adopts the following technical solution:

[0025] A zero-ground line misconnection test system includes: a test module and a monitoring module, wherein:

[0026] The test module is used to generate load information on the user's indoor line within a preset test period;

[0027] The monitoring module is used to monitor the zero-sequence current of the user access line and the zero-sequence current occurrence time within the preset test period;

[0028] The zero-ground wire misconnection testing device is also used to determine whether the zero-ground wire of the user line is misconnected according to whether the target zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the target zero-sequence current occurrence time is consistent with the actual load current occurrence time.

[0029] In some of the embodiments, a master station is also included, which is used to determine whether the neutral ground wire of the user's indoor line is wrongly connected based on whether the target zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the target zero-sequence current occurrence time is consistent with the actual load current occurrence time.

[0030] In some of the embodiments, the master station is further used to set the duration of the preset test period.

[0031] In some of the embodiments, the test module is connected to a three-pin socket of the user.

[0032] In some of the embodiments, the monitoring module is mounted on the meter box incoming line or the meter front end, upper branch, neutral and live wires or three-phase four-wires of the main outlet line of the user's meter to be tested.

[0033] In a third aspect, the present application provides a server, which adopts the following technical solution:

[0034] A server comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute any one of the above-mentioned neutral-ground line misconnection testing methods.

[0035] In a fourth aspect, the present application provides a computer-readable storage medium, which adopts the following technical solution:

[0036] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, any one of the above-mentioned neutral-ground line misconnection testing methods is executed.

[0037] In summary, the present application includes at least one of the following beneficial technical effects:

[0038] By generating zero-live load and live-ground load respectively on the user's indoor lines, the zero-sequence current value changes on the zero-live wire or three-phase four-wire of the meter box incoming line or the front end of the meter, the upper branch, and the main outlet line of the substation can be monitored to determine whether the zero-ground wire is misconnected. This can conveniently and accurately test the zero-ground wire misconnection in the user's home and reduce safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a flow chart of a method for testing a misconnection of a neutral ground line in an embodiment of the present application;

[0040] Figure 2 It is a schematic diagram of a zero-to-ground misconnection data judgment table in an embodiment of the present application;

[0041] Figure 3 is a flow chart of a neutral-ground line misconnection test system according to an embodiment of the present application;

[0042] Figure 4 This is an application scenario diagram of the neutral-ground line misconnection test method of an embodiment of the present application;

[0043] Figure 5 It is a socket schematic diagram of the neutral-ground wire misconnection test method of an embodiment of the present application. DETAILED DESCRIPTION

[0044] To more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. However, it should be understood by those of ordinary skill in the art that the present application can be implemented without these details. In some cases, in order to avoid unnecessary descriptions that make various aspects of the present application obscure, well-known methods, processes, systems, components and / or circuits that have been described at a higher level will not be described in detail. For those of ordinary skill in the art, it is obvious that various changes can be made to the embodiments disclosed in the present application, and without departing from the principles and scope of the present application, the general principles defined in the present application can be applied to other embodiments and application scenarios. Therefore, the present application is not limited to the embodiments shown, but conforms to the broadest scope consistent with the scope claimed for protection of the present application.

[0045] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with general skills in the technical field to which this application belongs. The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Words such as "one", "a", "a", "the", "these" and the like used in this application do not represent quantitative restrictions, and they can be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices.

[0046] The term "plurality" used in this application refers to two or more than two. Generally, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. used in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0047] The terms "system", "engine", "unit", "module" and / or "block" involved in the present application are a method for distinguishing different components, elements, parts, components, assemblies, or functions of different levels by level. These terms can be replaced by other expressions that can achieve the same purpose. Generally, the "module", "unit" or "block" involved in the present application refers to a collection of logic or software instructions embodied in hardware or firmware. The "module", "unit" or "block" described in the present application can be implemented as software and / or hardware, and in the case of being implemented as software, they can be stored in any type of non-volatile computer-readable storage medium or storage device.

[0048] In some embodiments, software modules / units / blocks can be compiled and linked into executable programs. It will be appreciated that software modules can be callable from other modules / units / blocks or from themselves, and / or can be called in response to detected events or interruptions. Software modules / units / blocks configured to be executed on a computing device can be arranged on a computer-readable storage medium, such as a compact disc, a digital video disc, a flash drive, a disk, or any other tangible media, or as a digital download (and can be initially stored in a compressed or installable format that requires installation, decompression or decryption before execution). Such software codes can be stored in part or in whole on the storage device of the computing device being executed, and applied to the operation of the computing device. Software instructions can be embedded in firmware, such as an EPROM. It will also be appreciated that hardware modules / units / blocks can be included in connected logical components, such as gates and triggers, and / or can be included in programmable units, such as programmable gate arrays or processors. The modules / units / blocks or computing device functions described herein can be implemented as software modules / units / blocks, and can also be represented in hardware or firmware. Generally, the modules / units / blocks described herein may be combined with other modules / units / blocks, or may be divided into sub-modules / sub-units / sub-blocks, although they are physically organized or stored. The description may apply to a system, an engine, or a portion thereof.

[0049] It will be understood that when a unit, engine, module, or block is referred to as being "on," "connected," or "coupled to" another unit, engine, module, or block, it may be directly on, connected, coupled, or in communication with the other unit, engine, module, or block, or there may be intermediate units, engines, modules, or blocks, unless the context clearly indicates otherwise. In this application, the term "and / or" may include any one or more of the relevant listed items or combinations thereof.

[0050] like Figure 1 As shown, the embodiment of the present application discloses a method for testing a neutral-ground line misconnection, which specifically includes the following steps:

[0051] S100, generating load information on the user's indoor line within a preset test period.

[0052] S200, within a preset test period, monitor the zero-sequence current of the user access line and the zero-sequence current occurrence time.

[0053] S300, judging whether the neutral ground wire of the user line is connected incorrectly according to whether the target zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the target zero-sequence current occurrence time is consistent with the actual load current occurrence time.

[0054] Furthermore, the method further comprises the following steps:

[0055] S301, generating a zero-fire load on the user's indoor line.

[0056] S302, within a preset test period, detect the zero-fire load zero-sequence current on the user access line.

[0057] S303, determining whether the actual zero-fire load current is consistent with the target zero-fire load zero-sequence current, and whether the actual zero-fire load current occurrence time is consistent with the target zero-fire load zero-sequence current occurrence time.

[0058] S304, if the actual zero-fire load current is consistent with the target zero-fire load zero-sequence current, and the actual zero-fire load current occurrence time is consistent with the target zero-fire load zero-sequence current occurrence time, it is determined that the zero-ground wire connection on the user's indoor line is wrong.

[0059] If the actual zero-fire load current is inconsistent with the target zero-fire load zero-sequence current, or the actual zero-fire load current occurrence time is inconsistent with the target zero-fire load zero-sequence current occurrence time, the following steps are included:

[0060] S305, generating a ground load on the user's indoor line.

[0061] S306, within a preset test period, detecting the zero-sequence current of the fire-ground load on the user access line.

[0062] S307, determining whether the actual fire ground load current is consistent with the target fire ground load zero sequence current, and whether the actual fire ground load current occurrence time is consistent with the target fire ground load zero sequence current occurrence time.

[0063] S308, if the actual fire-ground load current is consistent with the target fire-ground load zero-sequence current, and the actual fire-ground load current occurrence time is consistent with the target fire-ground load zero-sequence current occurrence time, it is determined that the zero-ground connection of the user line is correct.

[0064] Among them, the actual zero-fire load current is included in the actual load current, and the target zero-fire load zero-sequence current is included in the target zero-sequence current; the actual fire-ground load current is included in the actual load current; and the target fire-ground load zero-sequence current is included in the target zero-sequence current.

[0065] In order to more clearly illustrate how this embodiment determines the neutral-to-ground misconnection situation through the zero-sequence current, the following diagram is drawn: Figure 2 The judgment table shown is used for explanation.

[0066] The monitoring module monitors the zero-sequence current data in advance on the zero-live wire or three-phase four-wire of the meter box incoming line or the front end of the meter, the upper branch, and the main outlet of the substation of the meter to be tested. While the test module generates load information, it monitors the zero-sequence current data with time stamp on the zero-live wire or three-phase four-wire of the meter box incoming line or the front end of the meter, the upper branch, and the main outlet of the substation of the meter to be tested, and compares the zero-sequence current with time stamp with the size and time of the load current to determine whether the neutral ground wire is connected incorrectly.

[0067] like Figure 2 As shown, when the user has a misconnected neutral and fire connection, when the test module is loaded at the neutral and fire ends of the three-hole socket in the user's home, the zero-sequence current reported by the monitoring module mounted on the meter box incoming line or the front end of the meter, the upper branch, the neutral and fire wires of the substation's total outlet, or the three-phase four-wire should be consistent with the current magnitude and time of the load occurring at the neutral and fire ends, while the result is the opposite when the load occurs at the fire and ground ends.

[0068] Under normal wiring conditions, no matter how large the load is at the neutral and live ends, the upper neutral and live wires can form a loop current, so the zero-sequence current value cannot be tested on the neutral and live ends or the three-phase four-wire.

[0069] When the neutral-ground wire is misconnected, a load is generated at the neutral-live end. The live wire current forms a loop current with the ground wire after passing through the load. Therefore, the zero-sequence current value that can be tested on the neutral-live or three-phase four-wire and is approximately the same as the load current value is actually the load current value. In this embodiment, the load current value is preferably greater than the current value of the tripping threshold value of the final leakage protector, which can be above 21mA. According to the "Power Distribution Technical Guidelines Q / GDW 10370", a leakage protector should be installed at the final stage of the substation, i.e. after the user meter, and the zero-sequence current protection setting value is 30mA, and the tripping trigger value is 70% of the setting value, i.e. about 21mA.

[0070] When testing the zero-ground, the benefit of using a zero-fire load greater than 21mA is that it can also determine whether the tripping protection function of the final leakage protector of the test user is normal and whether it is installed correctly. When the zero-sequence current monitored by the monitoring module on the zero-fire line of the connected user is consistent with the actual zero-fire load current of the test module and the occurrence time is consistent, it means that the user has a zero-ground misconnection. At this time, if the corresponding final leakage protection does not trip, it means that the leakage protection tripping function of the leakage protector is abnormal. The operator can further check whether the leakage protector has incorrect wiring, is not installed or is faulty. In actual applications, due to the complexity of the leakage causes, it is troublesome to check and rectify. In order to maintain normal power supply, there are many cases where the leakage protector is not installed or does not operate normally after installation. Therefore, this test has practical application significance. If the final leakage protector corresponding to the user trips when the zero-fire load is connected during the test, it can also be judged that the test user has a zero-ground misconnection.

[0071] The protection tripping triggering condition of the leakage protector is the leakage value, which is equivalent to the zero-sequence current described in this application.

[0072] In extreme cases, when there is no leakage protector at the upper level of the tested user or the leakage protector fails, there is zero-sequence current in the neutral and live wires of the tested user. At this time, a load occurs at the neutral and live ends of the user's three-hole socket, and the zero-sequence current monitored by the monitoring module on the user's access line has an obvious increase process. When making judgments, the zero-sequence current increase characteristic at the time of load occurrence can be added.

[0073] Furthermore, when a load occurs at the neutral and live ends of the user's three-hole socket, the monitoring module mounted on the upper neutral and live wires or three-phase four-wire does not detect the zero-sequence current corresponding to the load. At this time, there may be a variety of situations such as the neutral-ground connection is wrong but the zero-live load data is not monitored, lost during the upload process, or zero-live load failure.

[0074] like Figure 3 and Figure 5 As shown, the test of adding the fire-ground load in this embodiment has verification significance. When a load occurs at the fire-ground end of the user's three-hole socket, it is judged according to the zero-sequence current data monitored by the upper zero-fire line or three-phase four-wire. If the zero-sequence data current at the time when the fire-ground load occurs is 0 or the zero-sequence current is significantly lower than the target fire-ground load current, it means that the zero-ground is connected incorrectly. If the actual fire-ground load current is close to the target fire-ground load zero-sequence current, it means that the wiring is correct. It should be noted that if the wiring is correct at this time, the current when the fire-ground load occurs will directly become the leakage trip judgment current of the upper leakage protector. In order to avoid this situation, the fire-ground load current can be set to be less than the trip threshold of the leakage protector. Taking the final leakage protector as an example, the fire-ground load current is set to be less than 20mA.

[0075] Furthermore, in this embodiment, the preset test period is a period of time before and after the load information is turned on. The length of this period of time can be manually set and adjusted. In order to fully cover the time when the load information is generated, it can be set to a period of time before and after the instruction is received as 1 minute before and 1 minute after.

[0076] In order to improve the accuracy of feature recognition, the value of the fire-ground load is set larger and the load current is greater than the tripping threshold of the upper leakage protector.

[0077] By generating zero-live load and live-ground load respectively on the user's indoor lines, the zero-sequence current value changes on the zero-live wire or three-phase four-wire of the meter box incoming line or the front end of the meter, the upper branch, and the main outlet line of the substation can be monitored to determine whether the zero-ground wire is misconnected. This can conveniently and accurately test the zero-ground wire misconnection in the user's home and reduce safety hazards.

[0078] like Figure 3 and Figure 5As shown, an embodiment of the present application also discloses a zero-ground wire misconnection test system, which includes a test module and a monitoring module, wherein the test module is used to generate load information on the user's indoor line within a preset test period; the monitoring module is used to monitor the zero-sequence current and the zero-sequence current occurrence time of the user's access line within the preset test period; the zero-ground wire misconnection test device is also used to determine whether the zero-ground wire of the user line is misconnected according to whether the target zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the target zero-sequence current occurrence time is consistent with the actual load current occurrence time.

[0079] Furthermore, it also includes a main station, which is used to determine whether the neutral ground wire of the user's indoor line is connected incorrectly based on whether the target zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the target zero-sequence current occurrence time is consistent with the actual load current occurrence time.

[0080] Among them, the main station is connected with the test module for communication, and the main station is also connected with the monitoring module for communication. The communication connection uses a 4G communication connection method. With the development of communication technology, other communication methods with the same cost performance or better performance can be used instead, as long as the relevant effects are met.

[0081] The front end of the test module is equipped with a three-pin plug, which matches the three-hole socket in the user's home. The upper ground, left zero and right fire are specified based on the socket surface. When the test module is inserted into the three-hole socket in the user's home, a zero-fire load is generated at the zero-fire end and specific load information is generated, and a fire-ground load is generated at the fire-ground end and specific load information is generated.

[0082] The monitoring module is pre-mounted on the meter box incoming line or the front end of the meter to be tested, the upper branch, the neutral and live wires or the three-phase four-wire of the main outgoing line of the substation, and is used to monitor the zero-sequence current in real time.

[0083] like Figure 3 As shown, the test module generates a zero-fire load or a fire-ground load on the user's indoor line within a preset test period through remote communication, and sends the information to the main station. After receiving the information, the main station generates a zero-fire load zero-sequence current identification instruction or a fire-ground load zero-sequence current identification instruction, and sends the instruction to the monitoring module through remote communication. After receiving the zero-fire load zero-sequence current identification instruction or the fire-ground load zero-sequence current identification instruction, the monitoring module detects the zero-fire load zero-sequence current or the fire-ground load zero-sequence current and its occurrence time corresponding to a period of time before and after the instruction time, and sends the corresponding load zero-sequence current and its occurrence time to the main station. The main station compares the received zero-fire load zero-sequence current or the fire-ground load zero-sequence current and its occurrence time with the zero-fire load or the fire-ground load and the load occurrence time generated by the test module, so as to analyze the user's zero-ground line misconnection situation.

[0084] Furthermore, when the test module generates a load at the zero-fire end of the user's three-hole socket, it generates zero-fire load information and uploads it to the main station. The main station generates a zero-fire load zero-sequence current identification instruction to the monitoring module. After receiving the instruction from the main station, the monitoring module uploads the zero-fire load zero-sequence current and its occurrence time before and after the instruction time to the main station. The main station compares the zero-fire load zero-sequence current and its occurrence time uploaded by the monitoring module with the fire-ground load current and the fire-ground load occurrence time, and Figure 2 The data sheet analyzes the user's misconnection of the neutral and ground wires.

[0085] Furthermore, when the test module generates a load at the zero-live end of the user's three-hole socket, the monitoring module mounted on the upper zero-live line or three-phase four-wire line does not monitor the zero-sequence current corresponding to the load. At this time, there are many situations such as the zero-ground connection is correct, the zero-ground connection is wrong but the zero-live load occurrence data is not monitored, it is lost during the upload process, or the zero-live load fails. At this time, the main station sends a live-ground load access instruction to the test module. After receiving the live-ground load access instruction, the test module generates a live-ground load on the user's three-hole socket, generates the live-ground load start information and uploads it to the main station. The main station generates a live-ground load zero-sequence current identification instruction to the monitoring module. After receiving the instruction sent by the main station, the monitoring module uploads the live-ground load zero-sequence current and its occurrence time before and after the instruction time to the main station. The main station compares the live-ground load zero-sequence current and its occurrence time uploaded by the monitoring module with the live-ground load current and load occurrence time, and determines the load occurrence time according to the live-ground load zero-sequence current and its occurrence time. Figure 2 Data analysis revealed that the user’s neutral-ground wire was incorrectly connected.

[0086] Furthermore, a neutral-ground line misconnection test system also includes a handheld terminal, which is connected to the main station and the test module through a remote communication module. The test module and the handheld terminal are connected by Bluetooth communication. The test module uploads the load information to the handheld terminal, and the handheld terminal forwards the load information to the main station. A viewing module is provided in the handheld terminal, and the viewing module is used for the operator to view the neutral-ground line misconnection situation.

[0087] A server is disclosed in an embodiment of the present application, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute a neutral-ground line misconnection test method.

[0088] The embodiment of the present application further discloses a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, a neutral-ground line misconnection test method is executed.

[0089] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for testing misconnection of neutral and ground wires, characterized in that include: During the preset test period, load information is generated on the user's indoor line; During the preset test period, monitoring the zero-sequence current of the user access line and the zero-sequence current occurrence time; According to whether the target zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the occurrence time of the target zero-sequence current is consistent with the actual load current occurrence time, judging whether the neutral ground wire of the user line is wrongly connected; Wherein, whether the target zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the occurrence time is consistent, and whether the zero-ground wire of the user line is wrongly connected, include the following steps: Producing a zero-fire load on the user's indoor line; Within the preset test period, detecting the zero-fire load zero-sequence current on the user access line; Determine whether the actual zero-fire load current is consistent with the target zero-fire load zero-sequence current, and whether the actual zero-fire load current occurrence time is consistent with the target zero-fire load zero-sequence current occurrence time; If the actual zero-fire load current is consistent with the target zero-fire load zero-sequence current, and the occurrence time of the actual zero-fire load current is consistent with the occurrence time of the target zero-fire load zero-sequence current, it is determined that the zero-ground wire connection on the user's indoor line is wrong; The actual zero-fire load current is included in the actual load current, and the target zero-fire load zero-sequence current is included in the target zero-sequence current; If the actual zero-fire load current is inconsistent with the target zero-fire load zero-sequence current, or the actual zero-fire load current occurrence time is inconsistent with the target zero-fire load zero-sequence current occurrence time, the following steps are also included: generating a ground load on the user's indoor line; During the preset test period, detecting the zero-sequence current of the power-to-ground load on the user access line; Determine whether the actual fire ground load current is consistent with the target fire ground load zero sequence current, and whether the occurrence time of the actual fire ground load current is consistent with the occurrence time of the target fire ground load zero sequence current; If the actual fire-ground load current is consistent with the target fire-ground load zero-sequence current, and the occurrence time of the actual fire-ground load current is consistent with the occurrence time of the target fire-ground load zero-sequence current, it is determined that the zero-ground connection of the user line is correct; The actual fire-ground load current is included in the actual load current; and the target fire-ground load zero-sequence current is included in the target zero-sequence current.

2. A neutral-ground line misconnection test system, characterized in that include: Test module and monitoring module, among which, The test module is used to generate load information on the user's indoor line within a preset test period; The monitoring module is used to monitor the zero-sequence current of the user access line and the zero-sequence current occurrence time within the preset test period; The zero-ground line misconnection test device is also used to determine whether the zero-ground line of the user line is misconnected according to whether the target zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the target zero-sequence current generation time is consistent with the actual load current generation time; It also includes a master station, which is used to determine whether the zero-ground wire of the user's indoor line is wrongly connected according to whether the target zero-sequence current corresponding to the load information is consistent with the actual load current, and whether the target zero-sequence current occurrence time is consistent with the actual load current occurrence time; The test module will generate a zero-fire load or a fire-ground load on the user's indoor line within a preset test period through remote communication, and send the information to the main station. After receiving the information, the main station will generate a zero-fire load zero-sequence current identification instruction or a fire-ground load zero-sequence current identification instruction, and send the instruction to the monitoring module through remote communication. After receiving the zero-fire load zero-sequence current identification instruction or the fire-ground load zero-sequence current identification instruction, the monitoring module will detect the zero-fire load zero-sequence current or fire-ground load zero-sequence current and its occurrence time corresponding to a period of time before and after the instruction time, and send the corresponding load zero-sequence current and its occurrence time to the main station. The main station will compare the received zero-fire load zero-sequence current or fire-ground load zero-sequence current and its occurrence time with the zero-fire load or fire-ground load and load occurrence time generated by the test module, so as to analyze the user's zero-ground line misconnection situation.

3. A neutral-ground line misconnection test system according to claim 2, characterized in that: The master station is also used to set the time length of the preset test period.

4. A neutral-ground line misconnection test system according to claim 2, characterized in that: The test module is connected to a three-hole socket of the user.

5. A neutral-ground line misconnection test system according to claim 2, characterized in that: The monitoring module is mounted on the meter box incoming line or the front end of the meter, the upper branch, the neutral and live wires or the three-phase four-wire of the main outgoing line of the user's meter to be tested.

6. A server, characterized in that: It comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute the neutral-ground line misconnection testing method as claimed in claim 1.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: The computer program executes the neutral-ground line misconnection testing method of claim 1 when executed by the processor.

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