A method for identifying cross-connection of electricity connections to judge abnormal electricity connection

Abstract

The present invention relates to a method for identifying cross-connection of households to judge abnormal power connection, comprising the following steps: Step 1, a detection module detects the zero-fire and fire-ground voltages of a user's three-pin socket; Step 2, an MCU processor judges the results of the user having power connection, no ground wire, no neutral wire, and no live wire; Step 3, a load module generates a preset load at the user's three-pin socket according to the judgment result of the MCU processor; Step 4, when the load module generates a load, a reading module reads the meter load and sends the data to the MCU processor, and the detection module detects the zero-fire voltage and sends the data to the MCU processor; Step 5, the MCU processor makes an abnormal judgment according to the voltage data detected by the detection module and the meter load data read by the reading module. The beneficial effect of the present invention is to solve the problem of incorrect judgment of the household-meter relationship caused by abnormal connection, and still be able to detect the household-meter relationship under various faults, and provide the detection of multiple faults at one time.

Description

Technical Field

[0001] The present invention relates to the technical field of household meter testing in power systems, and in particular, to a method for identifying cross-connection of households to judge abnormal power connection. Background Art

[0002] Household meter relationship: It refers to the corresponding relationship between each meter installed centrally and each actual household resident after the electric meters of urban and rural residents are installed centrally in a meter box. In the actual environment, the post-meter line generally accesses the user's home by being buried in the wall. At this time, due to identification errors or lack of effective means for acceptance, there is a certain probability of incorrect household meter relationships. When the household meter relationship is incorrect, the electricity charges used by the user will be measured on the meters of other users, which is likely to cause disputes.

[0003] Existing technologies for identifying the corresponding relationship of household meters cannot identify faults caused by the user's access line, resulting in problems such as incorrect identification of cross-connection of households and incomplete test function items. For example, in the technology described in "Patent No. ZL202022481251.X, a device for accepting inspection of a new residential area", the corresponding relationship of household meters is judged by reading the meter data when the user has a load. The application of this technology ignores the possible faults on the access line. Faults on the access line will cause problems such as the inability of the corresponding meter of the test user to record or incomplete recording of the load, resulting in misjudgment of non-corresponding household meters. For example, in "Patent No. ZL201510606891, a device and method for identifying the relationship of household meters", cross-connection of households is identified through an identification host, an identification slave, a forwarding device, a receiving device, and a background device. This technology uses a large number of device types and is complex to operate, but can only test one function of the household meter relationship, resulting in waste of labor resources. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for identifying cross-connection of households to judge abnormal power connection to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A method for identifying cross-connection of households to judge abnormal power connection uses a system for identifying cross-connection of households to judge abnormal power connection for identification. Among them, the system for identifying cross-connection of households to judge abnormal power connection includes: a data terminal for reading the load of the user's electric meter and a test terminal for judging abnormal user access and household meter relationship;

[0007] The data terminal includes: a data terminal communication module and a reading module for reading the load of the user's electricity meter; the test terminal includes: a test terminal communication module, a load module for generating a load, a detection module, and an MCU processor; the test terminal communication module communicates with the data terminal communication module to obtain the data of the reading module; the load module is electrically connected to the user's three-pin socket; the detection module is connected to the load module to detect the zero-fire voltage and the fire-ground voltage of the user; the MCU processor is connected to the detection module and the test terminal communication module to judge the abnormal power connection.

[0008] A method for identifying cross-connection of abnormal power connection includes the following steps:

[0009] Step 1, the detection module detects the zero-fire and fire-ground voltages of the user's three-pin socket;

[0010] Step 2, the MCU processor judges the results of the user having power connection, no ground wire, no neutral wire, and no live wire;

[0011] Step 3, the load module generates a preset load at the user's three-pin socket according to the judgment result of the MCU processor;

[0012] Step 4, when the load module generates a load, the reading module reads the electricity meter load and sends the data to the MCU processor, and the detection module detects the zero-fire voltage and sends the data to the MCU processor;

[0013] Step 5, the MCU processor judges the results of the household meter corresponding, the household meter not corresponding, the household meter corresponding but lacking a ground wire, the household meter not corresponding but lacking a ground wire, the household meter corresponding but lacking a neutral wire, the household meter not corresponding but lacking a neutral wire, the access line being loose, the access line being loose and lacking a ground wire, the access switch tripping abnormally, and the access switch tripping abnormally and lacking a ground wire according to the voltage data detected by the detection module and the electricity meter load data read by the reading module.

[0014] As a further solution of the present invention: when the detection module detects that both the zero-fire and fire-ground voltages are normal, the MCU processor judges that the user has power connection; when the detection module detects that the zero-fire voltage is normal and the fire-ground voltage is zero, the MCU processor judges that there is no ground wire; when the detection module detects that the zero-fire voltage is zero and the fire-ground voltage is normal, the MCU processor judges that there is no neutral wire; when the detection module detects that both the zero-fire and fire-ground voltages are zero, the MCU processor judges that there is no live wire.

[0015] As a further solution of the present invention: the reading module is specified to read the electricity meter corresponding to the test user. When the electricity meter load read is consistent with the load generated by the load module, the MCU processor judges that the household meter corresponds; when they are inconsistent, it judges that the household meter does not correspond.

[0016] As a further solution of the present invention: when the electricity meter load read is consistent with the load generated by the load module, the reading module reads other electricity meters to find the electricity meter corresponding to the test user.

[0017] As a further solution of the present invention: when the detection module detects the disappearance of the zero-fire voltage during the zero-fire end load occurrence, the MCU processor determines that the switch on the access line trips abnormally; when the detection module detects the fluctuation characteristics of the zero-fire voltage, the MCU processor determines that the access line is loosely connected.

[0018] As a further solution of the present invention: when the MCU processor determines that there is power connection or no ground wire, the load module generates a preset load at the zero-fire end of the user's three-phase socket. The MCU processor gives the results of corresponding household meter, non-corresponding household meter, loose connection of the access line, and abnormal tripping of the access switch according to the voltage data detected by the detection module and the meter data read by the reading module when there is power connection, and gives the results of corresponding household meter lacking ground wire, non-corresponding household meter lacking ground wire, loose connection of the access line and lacking ground wire, and abnormal tripping of the access switch and lacking ground wire when there is no ground wire.

[0019] As a further solution of the present invention: when the MCU processor determines that there is no neutral line, the load module generates a preset load at the fire-ground end of the user's three-pin socket. The MCU processor gives the results of corresponding household meter lacking neutral line and non-corresponding household meter lacking neutral line according to the voltage data detected by the detection module and the meter data read by the reading module.

[0020] As a further solution of the present invention: when the MCU processor determines that there is no live wire, the load module does not generate a load, and gives the result of no live wire.

[0021] As a further solution of the present invention: the test terminal communication module and the data terminal communication module are ZigBee wireless communication modules, lora wireless communication modules or 4G / 5G communication modules.

[0022] As a further solution of the present invention: when the test terminal communication module and the data terminal communication module are 4G / 5G communication modules, data interaction is realized through the communication master station between them.

[0023] As a further solution of the present invention: the reading module obtains the user's electricity meter load through HPLC carrier communication meter reading or 485 communication meter reading.

[0024] As a further solution of the present invention: the MCU processor is an UPD78F0526 chip.

[0025] As a further solution of the present invention: the circuit of the detection module includes: a detection circuit and a load control circuit; the load control circuit controls the load module to generate a load at the zero-fire end or the fire-ground end according to the power connection situation detected by the detection circuit.

[0026] As a further solution of the present invention: the load control circuit includes: a relay K1, a diode D11, a triode Q9, a resistor R120, a resistor R121, a resistor R122, a capacitor C62 and a capacitor C63;

[0027] One end of the resistor R120 is connected to the positive pole of the power supply and grounded through the capacitor C62; the other end of the resistor R120 is connected to the negative pole of the diode D11; the positive and negative poles of the diode D11 are respectively connected to the relay K1; the positive pole of the diode D11 is connected to the C pole of the triode Q9; the E pole of the triode Q9 is grounded; the B pole of the triode Q9 is connected to the external circuit through the resistor R121; one end of the resistor R122 is connected to the B pole of the triode Q9; the other end of the resistor R122 is grounded; one end of the capacitor C63 is connected to the B pole of the triode Q9; the other end of the capacitor C63 is grounded.

[0028] As a further solution of the present invention: the load control circuit further includes: a relay K2, a diode D10, a triode Q10, a resistor R117, a resistor R118, a resistor R119, a capacitor C60 and a capacitor C61;

[0029] One end of the resistor R117 is connected to the positive pole of the power supply and grounded through the capacitor C60; the other end of the resistor R117 is connected to the negative pole of the diode D10; the positive and negative poles of the diode D10 are respectively connected to the relay K2; the positive pole of the diode D10 is connected to the C pole of the triode Q10; the E pole of the triode Q10 is grounded; the B pole of the triode Q10 is connected to the external circuit through the resistor R118; one end of the resistor R119 is connected to the B pole of the triode Q10; the other end of the resistor R119 is grounded; one end of the capacitor C61 is connected to the B pole of the triode Q10; the other end of the capacitor C61 is grounded.

[0030] As a further solution of the present invention: the MCU processor judges the results of the user's power connection, no ground wire, no neutral wire, and no live wire according to the detection of the detection module;

[0031] The MCU processor judges the results of the corresponding household meter, non-corresponding household meter, corresponding household meter without a ground wire, non-corresponding household meter without a ground wire, corresponding household meter without a neutral wire, non-corresponding household meter without a neutral wire, virtual connection of the access line, virtual connection of the access line and lack of a ground wire, abnormal tripping of the access switch, and abnormal tripping of the access switch and lack of a ground wire according to the load of the user's electricity meter obtained by the test terminal communication module.

[0032] As a further solution of the present invention: the access line includes the entire line from the user meter outlet to the user's home power point.

[0033] As a further solution of the present invention: the access switch is arranged on the access line, and the access switch includes a post-meter switch and a user distribution box switch.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows: simple composition, convenient to use, solving the problem of incorrect judgment of the household-meter relationship caused by abnormal access lines, abnormal installation of switches on the lines, and faults. It can detect the household-meter relationship under various faults, and at the same time provide the detection of multiple faults at one time in the household-meter test work. Combine multiple test works into one work, simplify the test process, reduce the workload, and improve the efficiency. Thus, the device can complete multiple test tasks efficiently and with high quality at one time during the acceptance of household meters in newly built communities, and can also provide access fault tests for the meters to households in existing communities.

[0035] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a flowchart of a method for identifying cross-connection of electricity access anomalies of the present invention;

[0037] Figure 2 is Figure 1 a framework diagram of a system for identifying cross-connection of electricity access anomalies using the method for identifying cross-connection of electricity access anomalies in

[0038] Figure 3 is Figure 2 an application schematic diagram of a system for identifying cross-connection of electricity access anomalies in

[0039] Figure 4 is Figure 2 a circuit diagram of a load module of a system for identifying cross-connection of electricity access anomalies in

[0040] Figure 5 is Figure 2 a detection circuit diagram of a detection module of a system for identifying cross-connection of electricity access anomalies in

[0041] Figure 6 is Figure 2 a load control circuit diagram of a detection module of a system for identifying cross-connection of electricity access anomalies in

[0042] Figure 7 is Figure 2 a circuit diagram of an MCU processor of a system for identifying cross-connection of electricity access anomalies in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] Please refer to Figures 1 to 7 , in an embodiment of the present invention, a cross-connection identification system for judging abnormal power connection includes: a data terminal for reading the load of a user's electricity meter and a test terminal for judging user access abnormality and the relationship between the household meter.

[0045] The data terminal includes: a data terminal communication module and a reading module for reading the load of the user's electricity meter.

[0046] The test terminal includes: a test terminal communication module, a load module for generating a load, a detection module, and an MCU processor.

[0047] The test terminal communication module communicates with the data terminal communication module to obtain the data of the reading module.

[0048] The load module is electrically connected to the user's three-pin socket.

[0049] The detection module is connected to the load module to detect the user's zero-fire voltage and fire-ground voltage.

[0050] The MCU processor is connected to the detection module and the test terminal communication module to judge abnormal power connection. The MCU processor performs analysis and judgment of abnormalities and can also be called an analysis module.

[0051] As a specific implementation manner, the test terminal communication module and the data terminal communication module are ZigBee wireless communication modules, lora wireless communication modules, or 4G / 5G communication modules.

[0052] As an optional implementation manner, when the test terminal communication module and the data terminal communication module are 4G / 5G communication modules, data interaction is realized through a communication master station.

[0053] As a specific implementation manner, the reading module obtains the load of the user's electricity meter through HPLC carrier communication meter reading or 485 communication meter reading.

[0054] As a specific implementation manner, the MCU processor is a UPD78F0526 chip.

[0055] The circuit of the detection module includes: a detection circuit and a load control circuit. The load control circuit controls the load module to generate a load at the zero-fire end or the fire-ground end according to the power connection situation detected by the detection circuit;

[0056] As a specific implementation: The load control circuit includes: relay K1, diode D11, triode Q9, resistor R120, resistor R121, resistor R122, capacitor C62 and capacitor C63.

[0057] One end of resistor R120 is connected to the positive power supply and grounded through capacitor C62; the other end of resistor R120 is connected to the negative electrode of diode D11; the positive and negative electrodes of diode D11 are respectively connected to relay K1; the positive electrode of diode D11 is connected to the C pole of triode Q9; the E pole of triode Q9 is grounded; the B pole of triode Q9 is connected to the external circuit through resistor R121; one end of resistor R122 is connected to the B pole of triode Q9; the other end of resistor R122 is grounded; one end of capacitor C63 is connected to the B pole of triode Q9; the other end of capacitor C63 is grounded.

[0058] The load control circuit further includes: relay K2, diode D10, triode Q10, resistor R117, resistor R118, resistor R119, capacitor C60 and capacitor C61.

[0059] One end of resistor R117 is connected to the positive power supply and grounded through capacitor C60; the other end of resistor R117 is connected to the negative electrode of diode D10; the positive and negative electrodes of diode D10 are respectively connected to relay K2; the positive electrode of diode D10 is connected to the C pole of triode Q10; the E pole of triode Q10 is grounded; the B pole of triode Q10 is connected to the external circuit through resistor R118; one end of resistor R119 is connected to the B pole of triode Q10; the other end of resistor R119 is grounded; one end of capacitor C61 is connected to the B pole of triode Q10; the other end of capacitor C61 is grounded.

[0060] When relay K1 is off and relay K1 is connected, the load module has a load at the zero-fire terminal; when relay K1 is connected and relay K2 is off, the load module has a load at the fire-ground terminal.

[0061] The MCU processor determines the results of the user having power connection, no ground wire, no neutral wire, and no live wire according to the detection of the detection module.

[0062] The MCU processor determines the results of the household meter corresponding, the household meter not corresponding, the household meter corresponding but lacking a ground wire, the household meter not corresponding and lacking a ground wire, the household meter corresponding but lacking a neutral wire, the household meter not corresponding and lacking a neutral wire, the access line being loosely connected, the access line being loosely connected and lacking a ground wire, the access switch tripping abnormally, and the access switch tripping abnormally and lacking a ground wire according to the load of the user's electricity meter obtained by the test terminal communication module.

[0063] The access line includes the entire line from the user meter outlet to the user's home power point. The access switch is set on the access line, and the access switch includes a post-meter switch and a user distribution box switch.

[0064] As a specific implementation manner, when the load module is plugged into the user's three-pin socket, the zero-fire voltage and the fire-ground voltage are detected by the detection module. When it is detected that both the zero-fire voltage and the fire-ground voltage are normal, it is determined that the user has power connection. When it is detected that the zero-fire voltage is normal and there is no voltage between the fire wire and the ground wire, it is determined that there is no ground wire. When it is detected that there is no voltage between the zero wire and the fire wire and the fire-ground voltage is normal, it is determined that there is no zero wire. When it is detected that there is no voltage between the zero wire and the fire wire and between the fire wire and the ground wire, it is determined that there is no fire wire. In extreme cases, there may be a situation where there is a fire wire but no zero wire and no ground wire. In this case, the actual application effect in the household meter test is similar to that of having no fire wire and will not be emphasized. Of course, it is also possible to further design to make the load module resistively connected to the ground, and further test the voltage of the fire wire to the real ground. If there is electricity at this time, it means that there is a fire wire but no zero wire and no ground wire, otherwise there is no fire wire.

[0065] As a specific implementation manner, when the MCU processor determines that there is power connection or no ground wire, a relatively large specified load occurs at the zero-fire end of the load module, generally set to be greater than the protection threshold of the leakage protector and less than the load current rated for the line, which helps to judge the situation of loose connection of the access line and abnormal tripping of the access switch when the load occurs. While the load is occurring, the detection module detects voltage data and commands the reading module to read the corresponding user's electricity meter data.

[0066] As a specific implementation manner, the data terminal sends the electricity meter data corresponding to the tested user read to the MCU processor of the test terminal. The MCU processor judges the corresponding relationship between the household meter. When the load of the read electricity meter is consistent with the load generated by the load module, it is determined that the household meter corresponds; when they are inconsistent, it is determined that the household meter does not correspond. When they are inconsistent, other electricity meters are read to find out which electricity meter corresponds to the tested user.

[0067] As a specific implementation manner, when the detection module detects that the zero-fire voltage disappears during the load occurrence at the zero-fire end, it is determined that the switch on the access line trips abnormally. At this time, the load module cannot read the load data of the corresponding electricity meter, and in principle, an incorrect judgment of non-correspondence between the household meter and the electricity meter will occur. Therefore, the MCU processor can know through this judgment that the non-correspondence between this household meter and the electricity meter is caused by the abnormal tripping of the access switch, rather than the real non-correspondence between the household meter and the electricity meter. The MCU processor gives the result of the abnormal tripping of the access switch, avoiding the misjudgment of non-correspondence between the household meter and the electricity meter, and gives the result of the abnormal tripping of the switch when there is power connection. When there is no ground wire, it gives the result of the abnormal tripping of the switch and no ground wire. The staff can continue the test quickly after rectifying according to this clear result. The reasons for the abnormal tripping of the switch include: reverse connection of the zero wire and the ground wire of the leakage protection switch behind the meter, on the user's distribution box, at the test point, multiple parallel connections of the zero wire, and the failure of the load detection function of the load switch, etc.

[0068] As a specific implementation, when the detection module detects that there are large fluctuations in the zero-fire voltage during the zero-fire end load, the MCU processor determines that the access line is loose. Of course, the judgment condition for the fluctuation amplitude can be set. At this time, the load data read by the reading module for the corresponding electricity meter will be distorted and inconsistent with the actual load generated by the load module. In principle, there will also be an incorrect judgment of the non-correspondence between the household meter and the meter. Therefore, the MCU processor can know through this judgment that the non-correspondence between the household meter and the meter is caused by the loose access line, rather than the real non-correspondence between the household meter and the meter. The detection module gives the result of the loose access line, avoiding the incorrect judgment of the non-correspondence between the household meter and the meter. When there is power connection, it gives the result of the loose access line, and when there is no ground wire, it gives the result of the loose access line and no ground wire. The staff can continue the test quickly after rectifying according to this clear result. The reasons for the loose access line include: poor contact at the switch terminals and various connection points of the line from behind the meter to the user's power consumption point.

[0069] As a specific implementation, when the detection module detects that the zero-fire voltages during the zero-fire end load are all normal, the reading module can read the load data of the corresponding electricity meter at this time. When the load data read from the electricity meter is consistent with the load data generated by the load module, it indicates that the relationship between the household meter and the meter corresponds. The detection module gives the result of the corresponding relationship between the household meter and the meter when there is power connection, and gives the result of the corresponding relationship between the household meter and the meter with a lack of ground wire when there is a lack of ground wire. When the load data read from the electricity meter is inconsistent with the load data generated by the load module, it indicates that the relationship between the household meter and the meter does not correspond, and other electricity meters are read to find out which electricity meter corresponds to the test user. The MCU processor gives the result of the non-correspondence between the household meter and the meter and indicates the target electricity meter with incorrect connection when there is power connection, and gives the result of the non-correspondence between the household meter and the meter and the lack of ground wire and indicates the target electricity meter with incorrect connection when there is a lack of ground wire.

[0070] As a specific implementation, when the MCU processor determines that there is no neutral line, a small specified load occurs at the fire-ground end of the load module. Generally, a load current smaller than the protection threshold of the leakage protector is set to avoid the situation that the leakage protector trips due to the fire-ground current during the household meter test, thus making it impossible to conduct the household meter test. At this time, the load module can read the load data of the corresponding electricity meter. When the load data read from the electricity meter is consistent with the load data generated by the load module, it indicates that the relationship between the household meter and the meter corresponds, and the detection module gives the result of the corresponding relationship between the household meter and the meter with a lack of neutral line. When the load data read from the electricity meter is inconsistent with the load data generated by the load module, it indicates that the relationship between the household meter and the meter does not correspond, and other electricity meters are read to find out which electricity meter corresponds to the test user. The detection module gives the result of the non-correspondence between the household meter and the meter and the lack of neutral line and indicates the target electricity meter with incorrect connection, which is convenient for the staff to rectify the relationship between the household meter and the meter and the defect of the lack of ground wire.

[0071] As a specific implementation, when the MCU processor determines that there is no live wire, the load module cannot generate a load, the reading module does not work, and the detection module gives a result of no live wire. The staff can quickly rectify based on this clear result and then continue the test. The reasons for no live wire include: the line from behind the meter to the user's power point is not connected at the switch terminal and each connection point.

[0072] In summary, this embodiment can determine various results during the household meter test, such as correct household meter relationship, correct household meter relationship but missing ground wire, correct household meter relationship but missing neutral wire, incorrect household meter relationship, incorrect household meter relationship and missing ground wire, incorrect household meter relationship and missing neutral wire, loose connection of the wiring line, abnormal tripping of the access switch, no live wire, etc. When the household meter relationship is incorrect, the target meter with wrong connection is clearly indicated. The application of this technology realizes the one-time test of possible faults on the entire line from the meter to the household, and solves the misjudgment problem of non-corresponding household meters through the judgment of the fault cause. At the same time, accurate cross-household identification can still be carried out under various faults. Combining multiple test tasks into one reduces the work process, workload, and improves work efficiency. At the same time, clear fault causes are given, enabling the staff to rectify targeted, improving the accuracy and efficiency of rectification.

[0073] A method for cross-household identification to judge abnormal power connection includes the following steps:

[0074] Step 1, the detection module detects the zero-fire and fire-ground voltages of the user's three-pin socket.

[0075] Step 2, the MCU processor judges the results of the user having power connection, no ground wire, no neutral wire, and no live wire.

[0076] Step 3, the load module generates a preset load at the user's three-pin socket according to the judgment result of the MCU processor.

[0077] Step 4, when the load module generates a load, the reading module reads the meter load and sends the data to the MCU processor, and the detection module detects the zero-fire voltage and sends the data to the MCU processor.

[0078] Step 5, the MCU processor judges the results of corresponding household meter, non-corresponding household meter, corresponding household meter missing ground wire, non-corresponding household meter missing ground wire, corresponding household meter missing neutral wire, non-corresponding household meter missing neutral wire, loose connection of the access line, loose connection of the access line and missing ground wire, abnormal tripping of the access switch, and abnormal tripping of the access switch and missing ground wire according to the voltage data detected by the detection module and the meter load data read by the reading module.

[0079] More specifically, a method for cross-household identification to judge abnormal power connection includes:

[0080] A. Electrically connect the reading module at the low-voltage substation mains node for reading the meter data corresponding to the test user during the household meter test.

[0081] B. Insert a load module into the user's three - prong socket, which is used to generate a load specifically according to the judgment result of the detection module during the household meter test.

[0082] C. After inserting the load module into the user's three - prong socket, the detection module preferentially detects the zero - fire and fire - ground voltages to judge the results of the user having power connection, no ground wire, no neutral wire, and no live wire.

[0083] C1. When it is detected that both the zero - fire and fire - ground voltages are normal, it is judged that the user has power connection.

[0084] C2. When it is detected that the zero - fire voltage is normal and there is no voltage between the fire wire and the ground wire, it is judged that there is no ground wire.

[0085] C3. When it is detected that there is no voltage between the zero - fire wires and the fire - ground voltage is normal, it is judged that there is no neutral wire.

[0086] C4. When it is detected that there is no voltage between both the zero - fire and fire - ground wires, it is judged that there is no live wire.

[0087] D. When the MCU processor judges that there is power connection or no ground wire, the load module generates a specified large load at the zero - fire end. The reading module simultaneously reads the load data of the corresponding electricity meter of the test user to judge the corresponding relationship between the household meter when there is power connection and the corresponding relationship between the household meter when there is no ground wire. The detection module simultaneously detects the zero - fire voltage to judge whether the non - correspondence of the household meter is caused by loose connection of the line or abnormal tripping of the access switch.

[0088] D1. When the detection module detects that the zero - fire voltage disappears during the occurrence of the load at the zero - fire end, it is judged that the switch on the access line trips abnormally. At this time, the load module cannot read the load data of the corresponding electricity meter, and there will be an incorrect judgment of non - correspondence of the household meter. Therefore, through this judgment, the detection module knows that the non - correspondence of this household meter is caused by the abnormal tripping of the access switch, rather than the real non - correspondence of the household meter. Therefore, the detection module gives the result of abnormal tripping of the access switch to avoid the incorrect judgment of non - correspondence of the household meter. When there is power connection, it gives the result of abnormal tripping of the switch, and when there is no ground wire, it gives the result of abnormal tripping of the switch and no ground wire.

[0089] D2. When the detection module detects that there is a large fluctuation in the zero - fire voltage during the occurrence of the load at the zero - fire end, it is judged that there is a loose connection in the access line. At this time, the load data read by the load module from the corresponding electricity meter will be distorted and inconsistent with the actual load generated by the load module, and there will be an incorrect judgment of non - correspondence of the household meter. Therefore, through this judgment, the detection module knows that the non - correspondence of this household meter is caused by the loose connection of the access line, rather than the real non - correspondence of the household meter. Therefore, the detection module gives the result of loose connection of the access line to avoid the incorrect judgment of non - correspondence of the household meter. When there is power connection, it gives the result of loose connection of the access line, and when there is no ground wire, it gives the result of loose connection of the access line and no ground wire.

[0090] D3. When the detection module detects that the zero-fire voltage is normal during the zero-fire end load occurrence, the load module can read the load data of the corresponding electricity meter at this time. When the load data read from the electricity meter is consistent with the load data generated by the load module, it indicates that the household-meter relationship corresponds. The detection module gives the result of corresponding household-meter relationship when there is power connection, and gives the result of corresponding household-meter relationship with missing ground wire when there is no ground wire. When the load data read from the electricity meter is inconsistent with the load data generated by the load module, it indicates that the household-meter relationship does not correspond, and other electricity meters are read to find out which electricity meter corresponds to the test user. The detection module gives the result of non-corresponding household-meter relationship when there is power connection and indicates the target electricity meter with wrong connection, and gives the result of non-corresponding household-meter relationship and missing ground wire and indicates the target electricity meter with wrong connection when there is no ground wire.

[0091] To sum up, when there is power connection, the detection module gives the results of corresponding household-meter, non-corresponding household-meter and indicates the target electricity meter with wrong connection, loose connection of the access line, and abnormal tripping of the access switch. When there is no ground wire, the detection module gives the results of corresponding household-meter with missing ground wire, non-corresponding household-meter and missing ground wire and indicates the target electricity meter with wrong connection, loose connection of the access line and missing ground wire, and abnormal tripping of the access switch and missing ground wire.

[0092] When there is no neutral line, the load module generates a specified small load at the fire-ground end, and the reading module simultaneously reads the load data of the electricity meter corresponding to the test user to judge the household-meter corresponding relationship when there is no neutral line. The detection module gives the results of corresponding household-meter with missing neutral line, non-corresponding household-meter and missing neutral line and indicates the target electricity meter with wrong connection.

[0093] When there is no live wire, the load module cannot generate a load, the reading module does not work, and the detection module gives the result of no live wire.

[0094] To illustrate the application of the technical solution of this embodiment more clearly, the following examples are given:

[0095] The reading module is electrically connected to the mains node on the side of the low-voltage substation meter box as Figure 2 shown. In actual application, it can also be the main node side or branch side of the substation.

[0096] The load module is plugged into the three-pin socket in the home of User 1 as Figure 2 shown. The detection module preferentially detects the zero-fire and fire-ground voltages to judge the results of power connection, no ground wire, no neutral line, and no live wire from the electricity meter 1 to the three-pin plug of User 1.

[0097] When the MCU processor judges that User 1 as Figure 2 shown has power connection or no ground wire, the load module generates a specified large load at the zero-fire end of the three-pin socket of User 1, and the reading module simultaneously reads the load data of electricity meter 1 to judge the household-meter corresponding relationship. When the load of electricity meter 1 is consistent with the load generated by User 1, it indicates that the household-meter relationship corresponds, otherwise it does not correspond. When it does not correspond, continue to read asFigure 2 The load data of electricity meters 2 and 3 are used to determine which electricity meter is actually connected to User 1. The detection module detects the zero-fire voltage of the three-pin socket of User 1 while the load occurs. When there is a large voltage fluctuation, it is determined that the connected line is loosely connected. When the voltage directly disappears, it is determined that the connected switch trips abnormally. Based on the above conditions, a comprehensive result is given during the household meter test. When there is power connection, results such as household meter correspondence, household meter non-correspondence with the misconnected electricity meter clearly indicated, loose connection of the connected line, and abnormal tripping of the connected switch can be given. When there is no ground wire, results such as household meter correspondence lacking a ground wire, household meter non-correspondence and lacking a ground wire with the misconnected electricity meter clearly indicated, loose connection of the connected line and lacking a ground wire, and abnormal tripping of the connected switch and lacking a ground wire can be given.

[0098] When the MCU processor determines that Figure 2 as shown, User 1 has no neutral line, the load module generates a specified small load at the live-ground end of the three-pin socket of User 1. The reading module simultaneously reads the load data of electricity meter 1 to determine the correspondence relationship of the household meter, and the detection module gives results such as household meter correspondence lacking a neutral line, household meter non-correspondence and lacking a neutral line with the target misconnected electricity meter clearly indicated.

[0099] When the MCU processor determines that Figure 2 as shown, User 1 has no live line, the load module cannot generate a load, the reading module does not work, and the detection module gives a result of no live line.

[0100] The technical application described above runs through electricity meter 1 to the measurement point of User 1, covering the entire test line. The test is comprehensive, simplifies the original multiple tests into one test, and solves the misjudgment problem of non-corresponding household meters through the judgment of the cause of the fault. At the same time, accurate cross-household identification can still be carried out under various faults.

[0101] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0102] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for identifying cross-connection of electricity access for judging abnormal electricity access, characterized in that, Identification is performed using a cross - household identification system for judging abnormal power connection. Among them, the cross - household identification system for judging abnormal power connection includes: a data terminal for reading the load of the user's electricity meter and a test terminal for judging user access abnormalities and the relationship between the household and the meter; The data terminal includes: a data terminal communication module and a reading module for reading the load of the user's electricity meter; the test terminal includes: a test terminal communication module, a load module for generating a load, a detection module, and an MCU processor; The circuit of the detection module includes: a detection circuit and a load control circuit; the load control circuit controls the load module to generate a load at the zero - fire terminal or the fire - ground terminal according to the power connection situation detected by the detection circuit; the load control circuit includes: one end of a resistor R120 is connected to the positive pole of the power supply and grounded through a capacitor C62; the other end of the resistor R120 is connected to the negative pole of a diode D11; the positive and negative poles of the diode D11 are respectively connected to a relay K1; the positive pole of the diode D11 is connected to the C - pole of a triode Q9; the E - pole of the triode Q9 is grounded; the B - pole of the triode Q9 is connected to an external circuit through a resistor R121; one end of a resistor R122 is connected to the B - pole of the triode Q9; the other end of the resistor R122 is grounded; one end of a capacitor C63 is connected to the B - pole of the triode Q9; the other end of the capacitor C63 is grounded; A method for identifying cross - household with abnormal power connection includes the following steps: Step 1, the detection module detects the zero - fire and fire - ground voltages of the user's three - pin socket; Step 2, the MCU processor judges the results of user power connection, no ground wire, no neutral wire, and no live wire; Step 3, the load module generates a preset load at the user's three - pin socket according to the judgment result of the MCU processor; Step 4, when the load module generates a load, the reading module reads the electricity meter load and sends the data to the MCU processor, and the detection module detects the zero - fire voltage and sends the data to the MCU processor; Step 5, the MCU processor judges the results of corresponding household - meter, non - corresponding household - meter, corresponding household - meter without ground wire, non - corresponding household - meter without ground wire, corresponding household - meter without neutral wire, non - corresponding household - meter without neutral wire, virtual connection of the access line, virtual connection of the access line and without ground wire, abnormal tripping of the access switch, and abnormal tripping of the access switch and without ground wire according to the voltage data detected by the detection module and the electricity meter load data read by the reading module.

2. The method for identifying cross - household with abnormal power connection according to claim 1, characterized in that, When the detection module detects that both the zero - fire and fire - ground voltages are normal, the MCU processor judges that the user has power connection; when the detection module detects that the zero - fire voltage is normal and the fire - ground voltage is zero, the MCU processor judges that there is no ground wire; when the detection module detects that the zero - fire voltage is zero and the fire - ground voltage is normal, the MCU processor judges that there is no neutral wire; when the detection module detects that both the zero - fire and fire - ground voltages are zero, the MCU processor judges that there is no live wire.

3. The method for identifying cross - household with abnormal power connection according to claim 1, characterized in that, The reading module designates the electricity meter corresponding to the test user for reading. When the load of the read electricity meter is consistent with the load generated by the load module, the MCU processor determines that the household meter corresponds; when they are inconsistent, it determines that the household meter does not correspond.

4. A method for identifying cross-connection of abnormal power connection according to claim 3, characterized in that When the load of the read electricity meter is consistent with the load generated by the load module, the reading module reads other electricity meters to find the electricity meter corresponding to the test user.

5. A method for identifying cross-connection of abnormal power connection according to claim 1, characterized in that When the detection module detects that the zero-fire voltage disappears during the zero-fire end load occurrence, the MCU processor determines that the switch on the access line trips abnormally; When the detection module detects the fluctuation characteristics of the zero-fire voltage, the MCU processor determines that the access line is loosely connected.

6. A method for identifying cross-connection of abnormal power connection according to claim 1, characterized in that When the MCU processor determines that there is power connection or no ground wire, the load module generates a preset load at the zero-fire end of the user's three-phase socket. The MCU processor gives the results of corresponding household meter, non-corresponding household meter, loose connection of the access line, and abnormal tripping of the access switch based on the voltage data detected by the detection module and the electricity meter data read by the reading module when there is power connection, and gives the results of corresponding household meter lacking ground wire, non-corresponding household meter lacking ground wire, loose connection of the access line and lacking ground wire, and abnormal tripping of the access switch and lacking ground wire when there is no ground wire.

7. A method for identifying cross-connection of abnormal power connection according to claim 1, characterized in that When the MCU processor determines that there is no neutral line, the load module generates a preset load at the fire-ground end of the user's three-pin socket. The MCU processor gives the results of corresponding household meter lacking neutral line and non-corresponding household meter lacking neutral line based on the voltage data detected by the detection module and the electricity meter data read by the reading module.

8. A method for identifying cross-connection of abnormal power connection according to claim 1, characterized in that When the MCU processor determines that there is no live wire, the load module does not generate a load and gives the result of no live wire.

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