CN114675205A - Fault detection method, device, equipment, system and storage medium - Google Patents

Fault detection method, device, equipment, system and storage medium Download PDF

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Publication number
CN114675205A
CN114675205A CN202210332963.6A CN202210332963A CN114675205A CN 114675205 A CN114675205 A CN 114675205A CN 202210332963 A CN202210332963 A CN 202210332963A CN 114675205 A CN114675205 A CN 114675205A
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Prior art keywords
line
current
fault
power supply
line voltage
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CN202210332963.6A
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毕然
黄招彬
龙谭
黄正辉
付兆强
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Priority to CN202210332963.6A priority Critical patent/CN114675205A/en
Priority to EP22810364.4A priority patent/EP4328602A1/en
Priority to PCT/CN2022/092193 priority patent/WO2022247637A1/en
Publication of CN114675205A publication Critical patent/CN114675205A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • G01R31/42—AC power supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/16—Measuring asymmetry of polyphase networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/55—Testing for incorrect line connections

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The embodiment of the application discloses a fault detection method, which comprises the following steps: acquiring a first line voltage and a second line voltage of three-phase power supply equipment; performing fault analysis on the three-phase power supply equipment based on the first line voltage and the second line voltage to obtain a fault detection result; if the fault detection result shows that the line-to-line voltage is unbalanced, acquiring a first output line current and a second output line current of the three-phase power supply equipment; determining a fault type based on the first output line current and the second output line current; and displaying fault prompt information for indicating the fault type. The embodiment of the application also discloses a fault detection device, equipment, a system and a storage medium.

Description

Fault detection method, device, equipment, system and storage medium
Technical Field
The present application relates to the field of power detection technologies, and in particular, to a method, an apparatus, a device, a system, and a storage medium for fault detection.
Background
In an application system powered by a three-phase Power supply, such as an inverter air conditioning system, a three-phase Power supply circuit generally includes a three-phase passive Power Factor Correction (PFC) scheme circuit, a three-phase active PFC two-level scheme circuit, and a three-phase active PFC three-level scheme circuit topology. The main circuit of the three-phase power supply circuit can be used for driving the variable frequency compressor, and can also be used for leading out one phase from the three-phase power supply circuit to independently rectify the phase and supply power to the auxiliary power supply, and further can supply power to the direct current fan driving circuit.
At present, if a live wire led out from a three-phase power supply circuit and used for supplying power to an auxiliary power supply is in phase failure and the auxiliary power supply does not work, a microcontroller does not work, and problems are easy to find; however, if the other two live wires except the live wire for supplying power to the auxiliary power supply are out of phase, although the auxiliary power supply and the microcontroller can work, when the rectifier in the main circuit runs with load or runs at full load, a fault or even damage to the load device or the rectifier can be caused, and the fault detection efficiency is low because no method for quickly and effectively detecting the fault exists at present.
Content of application
In order to solve the above technical problems, embodiments of the present application desirably provide a fault detection method, apparatus, device, system, and storage medium, so as to solve the problem that the current three-phase power supply device is poor in working efficiency due to a fault that a wiring error or a phase failure easily occurs, implement a method for effectively detecting a wiring error or a phase failure in advance, effectively reduce the probability of damage to a device in the three-phase power supply device, and ensure the reliability of use of the three-phase power supply device.
The technical scheme of the application is realized as follows:
in a first aspect, a method of fault detection, the method comprising:
acquiring a first line voltage and a second line voltage of the three-phase power supply equipment;
performing fault analysis on the three-phase power supply equipment based on the first line voltage and the second line voltage to obtain a fault detection result;
if the fault detection result shows that the line-to-line voltage is unbalanced, acquiring a first output line current and a second output line current of the three-phase power supply equipment;
determining a fault type based on the first output line current and the second output line current;
and displaying fault prompt information for indicating the fault type.
In a second aspect, a fault detection apparatus, the apparatus comprising: the device comprises an acquisition unit, an analysis unit, a determination unit and a display unit; wherein:
the acquiring unit is used for acquiring a first line voltage and a second line voltage of the three-phase power supply equipment;
the analysis unit is used for carrying out fault analysis on the three-phase power supply equipment based on the first line voltage and the second line voltage to obtain a fault detection result;
the obtaining unit is further configured to obtain a first output line current and a second output line current of the three-phase power supply device if the fault detection result indicates that the line-to-line voltage is unbalanced;
the determining unit is configured to determine a fault type based on the first output line current and the second output line current;
and the display unit is used for displaying fault prompt information for indicating the fault type.
In a third aspect, a fault detection apparatus, the apparatus comprising: a detection circuit, a processor and a display device; wherein:
the detection circuit is used for detecting the voltage between a first live wire and a zero line in the three-phase power supply equipment to obtain a first line voltage, detecting the voltage between a second live wire and the zero line in the three-phase power supply equipment to obtain a second line voltage, and sending the first line voltage and the second line voltage to the processor; wherein the first live line and the second live line are any two live lines of the three-phase power supply equipment;
the processor is used for carrying out fault analysis on the three-phase power supply equipment based on the first line voltage and the second line voltage to obtain a fault detection result; if the fault detection result shows that the line-to-line voltage is unbalanced, controlling the detection circuit to detect the line current of the live line of the three-phase power supply equipment;
the detection circuit is further configured to detect an output current of a third live wire in the three-phase power supply device to obtain a first output wire current, detect an output current of a fourth live wire in the three-phase power supply device to obtain a second output wire current, and send the first output wire current and the second output wire current to the processor; wherein the third live line and the fourth live line are any two live lines of the three-phase power supply equipment;
the processor is configured to determine a fault type based on the first output line current and the second output line current;
and the display device is used for displaying fault prompt information used for indicating the fault type.
In a fourth aspect, a three-phase power supply system includes: a three-phase power supply apparatus for supplying three-phase power and a fault detection apparatus as described above.
In a fifth aspect, a storage medium has stored thereon a fault detection program which, when executed by a processor, implements the steps of the fault detection method as defined in any one of the above.
In the embodiment of the application, after the first line voltage and the second line voltage of the three-phase power supply device are obtained, fault analysis is performed on the three-phase power supply device based on the first line voltage and the second line voltage, a fault detection result is obtained, if the fault detection result indicates that the line-to-line voltages are unbalanced, the first output line current and the second output line current of the three-phase power supply device are continuously obtained, and fault prompt information used for indicating the fault type is displayed after the fault type is determined based on the first output line current and the second output line current. Therefore, when the first line voltage and the second line voltage are subjected to fault analysis and the line-to-line voltage is determined to be unbalanced, the first output line current and the second output line current of the three-phase power supply equipment are continuously acquired to determine the specific fault type and display the fault type, the problem that the working efficiency is poor due to the fact that a fault of wiring error or open phase easily occurs in the existing three-phase power supply equipment is solved, the method for effectively detecting the wiring error or open phase fault in advance is achieved, the probability of damage of equipment devices in the three-phase power supply equipment is effectively reduced, and the use reliability of the three-phase power supply equipment is guaranteed.
Drawings
Fig. 1 is a first schematic flow chart of a fault detection method according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart illustrating a second fault detection method according to an embodiment of the present application;
fig. 3 is a circuit topology diagram of a three-phase power supply device according to an embodiment of the present application;
fig. 4 is a schematic connection diagram between a three-phase power supply device and a fault detection device according to an embodiment of the present disclosure;
FIG. 5 is a three-phase voltage vector diagram provided by an embodiment of the present application;
fig. 6 is a schematic voltage vector diagram of a live line a and a neutral line N connected in reverse according to an embodiment of the present disclosure;
fig. 7 is a schematic voltage vector diagram of a live line B and a neutral line N after being reversely connected according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a fault detection apparatus according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a fault detection device according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a three-phase power supply system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
An embodiment of the present application provides a fault detection method, which is applied to a fault detection device and shown in fig. 1, and includes the following steps:
step 101, acquiring a first line voltage and a second line voltage of a three-phase power supply device.
In the embodiment of the present application, the three-phase power supply device is generally referred to as a three-phase four-wire power supply device, and includes three live wires and one neutral wire. The line voltage is the voltage between the hot line and the hot line. The voltage between any two live wires in the three-phase power supply equipment is detected through the voltage detection equipment, and the first line voltage and the second line voltage are obtained.
102, performing fault analysis on the three-phase power supply equipment based on the first line voltage and the second line voltage to obtain a fault detection result.
In the embodiment of the application, the first line voltage and the second line voltage are compared and analyzed, and the fault analysis of the three-phase power supply equipment can be realized through the voltage relation between the line voltages of the three-phase power supply equipment, so that a fault detection result is obtained, wherein the fault detection result comprises two results of line-to-line voltage balance or line-to-line voltage unbalance.
In some application scenarios, the magnitude relationship between the first line voltage and the second line voltage and the preset voltage threshold may be directly compared, and if at least one of the first line voltage and the second line voltage is smaller than the preset voltage threshold, it may be determined that the phase-missing fault exists as the fault detection result. The preset voltage threshold may be an empirical value obtained through a large number of experiments, and the value range of the preset voltage threshold is (0,
Figure BDA0003573671870000051
) Alternatively, the user may select a value in the range of (0,
Figure BDA0003573671870000052
) Selecting an empirical value to set according to actual requirements; vm is a phase voltage vector amplitude of a phase voltage signal of the three-phase power supply equipment.
And 103, if the fault detection result shows that the line-to-line voltage is unbalanced, acquiring a first output line current and a second output line current of the three-phase power supply equipment.
In the embodiments of the present application, there are generally two reasons for the line-to-line voltage imbalance: one is the fault that the live wire and the zero wire of the three-phase power supply equipment are reversely connected, and the other is the fault that the live wire is missed, namely, the phase is lost. The line current is the current output in the hot line. And when the fault detection result shows that the line-to-line voltage of the three-phase power supply equipment is unbalanced, the fault detection equipment continuously acquires the line currents of any two live wires of the three-phase power supply equipment to obtain a first output line current and a second output line current.
Step 104, determining the fault type based on the first output line current and the second output line current.
In the embodiment of the application, according to the characteristics of the output currents of the three live wires in the three-phase power supply equipment, the current characteristic analysis is performed on the first output wire current and the second output wire current, so that the fault type of the specific wiring fault of the three-phase power supply equipment can be determined. The fault types comprise a type that live wires and zero wires are connected in a wrong way and a phase loss type.
And 105, displaying fault prompt information for indicating the fault type.
In the embodiment of the application, after the specific fault type is determined, the fault prompt information is displayed, so that a user can remove faults aiming at the fault type according to the fault prompt information, the safety of important components and parts and the safety of loads in the three-phase power supply equipment are ensured, the use experience effect of the user is improved, and the loss is reduced.
In the embodiment of the application, after the first line voltage and the second line voltage of the three-phase power supply device are obtained, fault analysis is performed on the three-phase power supply device based on the first line voltage and the second line voltage, a fault detection result is obtained, if the fault detection result indicates that the line-to-line voltages are unbalanced, the first output line current and the second output line current of the three-phase power supply device are continuously obtained, and fault prompt information used for indicating the fault type is displayed after the fault type is determined based on the first output line current and the second output line current. Therefore, when the first line voltage and the second line voltage are subjected to fault analysis and the line-to-line voltage is determined to be unbalanced, the first output line current and the second output line current of the three-phase power supply equipment are continuously acquired to determine the specific fault type and display the fault type, the problem that the working efficiency is poor due to the fact that a fault of wiring error or open phase easily occurs in the existing three-phase power supply equipment is solved, the method for effectively detecting the wiring error or open phase fault in advance is achieved, the probability of damage of equipment devices in the three-phase power supply equipment is effectively reduced, and the use reliability of the three-phase power supply equipment is guaranteed.
Based on the foregoing embodiments, an embodiment of the present application provides a fault detection method, which is applied to a fault detection device and shown in fig. 2, and includes the following steps:
step 201, acquiring a first line voltage and a second line voltage of the three-phase power supply equipment.
In this embodiment, the fault detection device may detect voltages on any two power input live wires of the three-phase power supply device through a voltage detection module in the detection circuit, and thus, the fault detection device may acquire the effective voltages, i.e., the first line voltage and the second line voltage, detected by the detection circuit from the detection circuit. For example, assuming that three live wires of a three-phase power supply device are sequentially labeled A, B, C, if voltage detection modules in the detection circuit are connected to live wires a and B, B and C, a first line voltage U between the live wires a and B can be detected respectivelyABSecond line voltage U between lines B and CBC。
Step 202, determining a third line voltage of the three-phase power supply device based on the first line voltage and the second line voltage.
In the embodiment of the application, the third line voltage can be determined and obtained according to the first line voltage and the second line voltage according to the line voltage relationship among the three live wires in the three-phase power supply equipment. Line connection between three live wires in three-phase power supply equipmentThe pressure relationship can adopt a vector operation formula UAB+UBC+UCAAnd 0.
Illustratively according to a first line voltage UABAnd a second line voltage UBCThe third line voltage U can be calculatedAC＝-UCA＝UAB+UBC。
And 203, analyzing the fault of the three-phase power supply equipment based on the first line voltage, the second line voltage and the third line voltage to obtain a fault detection result.
In the embodiment of the application, the first line voltage, the second line voltage and the third line voltage are compared and analyzed, and then the fault detection result can be determined.
And 204, if the fault detection result shows that the line-to-line voltage is unbalanced, acquiring a first output line current and a second output line current of the three-phase power supply equipment.
In this embodiment of the application, if it is determined that the fault detection result is that the line-to-line voltage is unbalanced according to the comparison and analysis of the first line voltage, the second line voltage, and the third line voltage, the fault detection device controls the current detection device, which is included in the detection circuit and connected to any two live wires in the three-phase power supply device, to perform current detection on the corresponding live wires, so as to obtain the first output line current and the second output line current of the three-phase power supply device.
Illustratively, when the fault detection result indicates that the line-to-line voltage is unbalanced, the current output by the live line B and the current output by the live line C of the three-phase power supply equipment are acquired through hall sensors arranged on the live line B and the live line C respectively to obtain a first output line current IBAnd a second output line current IC。
Step 205, determining the fault type based on the first output line current and the second output line current.
In the embodiment of the application, the current I is applied to the first output lineBAnd a second output line current ICAnd performing comparative analysis to determine the fault type. If at least one of the first output line current and the second output line current is smaller than a first preset current threshold value, determining that the fault type is a phase-lack fault and the corresponding fault type is smaller than a first preset current threshold valueThe current of the current threshold corresponds to the phase loss of the live wire.
And step 206, displaying fault prompt information for indicating the fault type.
In the embodiment of the application, the determined fault type is displayed in the form of fault prompt information, so that a user can quickly know the fault type to perform troubleshooting, and loss is reduced. The fault prompt message can be realized in one or more forms of characters, pictures, sounds, lights and the like. The fault detection device may send the fault prompt information to a device in communication with the fault detection device for display, and the device in communication with the fault detection device may include one or more of a central control device in an intelligent home, an intelligent mobile terminal device, or a remote control device.
Based on the foregoing embodiments, in other embodiments of the present application, step 203 may be implemented by steps 203a to 203 c:
step 203a, determining a maximum line voltage and a minimum line voltage from the first line voltage, the second line voltage and the third line voltage.
In the embodiment of the application, the magnitudes of the first line voltage, the second line voltage and the third line voltage are compared to obtain the maximum line voltage and the minimum line voltage. Illustratively, from a first line voltage UABSecond line voltage UBCAnd a third line voltage UACWhen the maximum line voltage and the minimum line voltage are determined, the first line voltage U is determinedABSecond line voltage UBCAnd a third line voltage UACIs comparatively analyzed assuming that the maximum line voltage determined is UABMinimum line voltage of UBC。
Step 203b, determine the ratio of maximum line voltage to minimum line voltage.
In the embodiment of the application, the ratio b between the maximum line voltage and the minimum line voltage is determined by the formula b. Illustratively, the ratio determined is b ═ UAB/UBC。
And 203c, if the ratio is greater than or equal to the preset threshold, determining that the fault detection result is line-to-line voltage imbalance.
In the embodiment of the present application, the preset threshold is an empirical value obtained through a large number of experimental analyses, and a value range of the preset threshold is 1 to 2, for example, a value of 1.5 may be obtained. Illustratively, if UAB/UBCAnd if the voltage is larger than or equal to 1.5, determining that the fault detection result is line-to-line voltage unbalance. If the ratio is larger than the preset threshold value, the fault detection result is determined to be line-to-line voltage balance, namely no fault exists, so that subsequent analysis is not needed, and only monitoring operation is normally executed.
Based on the foregoing embodiments, in other embodiments of the present application, step 205 may be implemented by steps 205a to 205 c:
step 205a determines a third output line current based on the first output line current and the second output line current.
In the embodiment of the present application, the vector relationship between the three-phase line currents in the three-phase power supply equipment is IA+IB+IC0. Thus, knowing the line currents corresponding to two of the two phases, the third output line current can be calculated.
Illustratively, upon detection of the first output line current IBAnd a second output line current ICThereafter, a third output line current I can be calculatedA＝-(IB+IC)。
Step 205c, determining a fault type based on the first output line current, the second output line current, and the third output line current.
In the embodiment of the present application, the specific fault type can be determined by comparing and analyzing the first output line current, the second output line current, and the third output line current.
Based on the foregoing embodiments, in other embodiments of the present application, step 205c may be implemented by steps a 11-a 12:
step a11, in the case where a slave relay connected to the power factor correction device in the three-phase power supply apparatus is turned on, determines a minimum line current from among the first output line current, the second output line current, and the third output line current.
The slave relay is connected in series between the main circuit and a commercial alternating current power supply.
In the embodiment of the present application, the condition of conducting the slave relay is generally an application scenario of the initial power-on of the three-phase power supply device, that is, when the three-phase power supply equipment is initially electrified, the slave relay of the three-phase power supply equipment is conducted, at the moment, the first line voltage and the second line voltage are collected, then, the first line voltage and the second line voltage are subjected to fault analysis, when the fault detection result identifies the line-to-line voltage imbalance, the first output line current and the second output line current are continuously obtained, and, after determining the third output line current based on the first output line current and the second output line current, and comparing and analyzing the first output line current, the second output line current and the third output line current to determine the minimum line current, wherein the current values of the first output line current, the second output line current and the third output line current are positive values which are greater than or equal to 0. The minimum line current includes at least one line current.
Step a12, if the minimum line current is less than or equal to the first preset current threshold, determining the fault type as a phase-loss fault.
In the embodiment of the present application, the first preset current threshold is an empirical value obtained through a large number of experiments, and the value range of the first preset current threshold is 0 to 1 ampere (a), including 0 and 1. Illustratively, the first preset current threshold is 1 ampere, and if the minimum line current is less than or equal to 1 ampere, the fault type is determined to be a phase-loss fault.
Based on the foregoing embodiments, in other embodiments of the present application, after the fault detection device performs step a12, the fault detection device is further configured to perform steps a13 to a 15:
and a13, determining a first target live wire corresponding to the minimum wire current.
In the embodiment of the application, after the fault type is determined to be the open-phase fault, the live wire corresponding to the minimum line current is determined, and the first target live wire is obtained.
Step a14, first prompt information for prompting the phase loss of the first target live wire is generated.
In the embodiment of the application, first prompt information used for indicating the defect of the first target live wire is generated based on the determined first target live wire.
And a step a15, displaying the first prompt message.
In this embodiment of the application, the first prompt message may be a prompt message in the form of one or a combination of several of characters, pictures, sounds, lights, and the like, and may be displayed in a display area corresponding to the fault detection device, or may be displayed on a device communicatively connected to the fault detection device. Therefore, a user can determine a specific fault position according to the first prompt information, rapid fault positioning and fault solving are achieved, the fault solving efficiency is improved, the safety of the three-phase power supply equipment is guaranteed, and the possibility that a load and a precision instrument in the three-phase power supply equipment are damaged is reduced.
Based on the foregoing embodiment, in other embodiments of the present application, after the fault detection device performs step a11, it may further select to perform step a 16:
step a16, if the minimum line current is larger than the first preset current threshold, determining the fault type as a fault line connection type.
In the embodiment of the application, the type of the misconnection line is the type of misconnection of the zero line and the live line.
Based on the foregoing embodiments, in other embodiments of the present application, after the fault detection device performs step a16, the fault detection device is further configured to perform steps a17 to a 18:
step a17, if the first line voltage, the second line voltage and the third line voltage are based on, determining that the second target live wire and the zero line are connected in error, and generating second prompt information for prompting that the second target live wire and the zero line are connected in error.
In the embodiment of the application, after the fault type is determined to be the wrong connection type, the first line voltage, the second line voltage and the third line voltage are continuously analyzed to determine the specific wrong connection line of the live wire. The process of analyzing the first line voltage, the second line voltage and the third line voltage may be: sequencing the first line voltage, the second line voltage and the third line voltage according to the magnitude relation to obtain a maximum voltage, a middle voltage and a minimum voltage; determining a first ratio between a maximum voltage and a minimum voltage, and an intermediate voltageA second ratio to a minimum voltage; determining
Figure BDA0003573671870000101
Obtaining a first threshold value by the difference value of the preset error coefficient, and determining
Figure BDA0003573671870000102
Obtaining a second threshold value with the sum of the preset error coefficient; determining a sum of 1 and a preset error coefficient to obtain a third threshold, wherein the preset error coefficient is greater than or equal to 0 and less than or equal to 0.3; when the first ratio is greater than or equal to a first threshold value, the first ratio is less than or equal to a second threshold value, the second ratio is greater than or equal to 1, the second ratio is less than or equal to a third threshold value, and the live wire corresponding to the maximum voltage does not include a live wire used for providing power for the fault detection equipment, determining a second target live wire to provide the power for the fault detection equipment; when the first ratio is greater than or equal to the first threshold, the first ratio is less than or equal to the second threshold, the second ratio is greater than or equal to 1, the second ratio is less than or equal to the third threshold, and the live wire corresponding to the maximum voltage comprises a live wire C for providing power for the fault detection equipment, determining that the second target live wire is the live wire C for dividing the maximum voltage into U and the U is the maximum voltage in the three-phase power supply equipmentACAnd the corresponding live wires B outside the two live wires A and C are second target live wires, namely the second target live wires are B live wires. Therefore, after the second target live wire connected with the wrong wire is determined according to the first line voltage, the second line voltage and the third line voltage, second prompt information is generated to prompt a user that the second target live wire is connected with the zero wire in a wrong way.
And a step a18, displaying the second prompt message.
In this embodiment of the application, the second prompt message may be a prompt message in the form of one or a combination of several of characters, pictures, sounds, lights, and the like, and may be displayed in a display area corresponding to the fault detection device, or may be displayed on a device communicatively connected to the fault detection device.
Based on the foregoing embodiments, in other embodiments of the present application, step 205c may be implemented by steps b 11-b 12:
and b11, determining the minimum line current from the first output line current, the second output line current and the third output line current under the condition that the main relay in the three-phase power supply equipment is in a conducting state.
In the embodiment of the application, after the slave relay is disconnected and the master relay is controlled to be switched on, when the fault detection result indicates that the line-to-line voltage is unbalanced, the first output line current and the second output line current are continuously collected, after the third output line current is determined based on the first output line current and the second output line current, the first output line current, the second output line current and the third output line current are subjected to size analysis, and the minimum line current is determined.
And b12, if the minimum line current is less than or equal to a second preset current threshold, and the currents except the minimum line current in the first output line current, the second output line current and the third output line current are all greater than or equal to a third preset current threshold, determining that the fault type is a phase-loss fault.
And the third preset current threshold is greater than the second preset current threshold.
In the embodiment of the present application, the second preset current threshold is an empirical value obtained through a large number of experiments, and for example, the second preset current threshold may be greater than 0 and less than or equal to 1 ampere, the third preset current threshold is an empirical value obtained through a large number of experiments, and the third preset power threshold is greater than or equal to 3 amperes and less than or equal to 6 amperes. Illustratively, if the minimum line current is, for example, IALess than or equal to 1 ampere, and IBAnd ICAnd if the current is greater than or equal to 5 amperes, determining that the fault type is a phase-loss fault.
Based on the foregoing embodiment, in other embodiments of the present application, after the fault detection device performs step b12, the fault detection device is further configured to perform steps b13 to b 15:
and b13, determining a second target live wire corresponding to the minimum wire current.
And b14, generating third prompt information for indicating the phase loss of the second target live wire.
And b15, displaying the third prompt message.
Based on the foregoing embodiments, in other embodiments of the present application, after the fault detection device performs step b12, the fault detection device is further configured to perform step b 16:
and b16, if at least one of the first output line current, the second output line current and the third output line current is detected to be larger than or equal to a fourth preset current threshold, controlling a main relay of the three-phase power supply equipment to be in an off state and controlling a load of the three-phase power supply equipment to be in a shutdown state.
Wherein the fourth predetermined current threshold is greater than the third predetermined current threshold.
In the embodiment of the present application, the fourth preset current threshold is an empirical value obtained through a large number of experiments, and the fourth preset current threshold is greater than or equal to 9 amperes. When the main relay is conducted, after the fault type is determined to be a phase-loss fault, the first output line current and the second output line current are continuously monitored, the third output line current is determined, if at least one line current of the first output line current, the second output line current and the third output line current is equal to or equal to a fourth preset current threshold value, for example, 10 amperes, the fault detection device controls the main relay to be disconnected, controls the load of the three-phase power supply device to be in a shutdown state and does not work any more, therefore, the safety of circuit components in the three-phase power supply device is protected, the safety of the load is also protected, the situation that the load is burnt out is prevented, and loss is reduced.
For example, a circuit topology diagram of a three-phase active PFC three-level device including a main circuit driving a variable frequency compressor, and an auxiliary circuit for separately rectifying power supplied to an auxiliary power supply and supplying power to a dc fan driving circuit can be shown in fig. 3. A slave relay S1 and a master relay S2 are connected to a live line a of the three-phase power supply apparatus, a slave relay S1 and a master relay S2 are connected in parallel, and a slave relay S3, a master relay S4, and a slave relay S3 and a master relay S4 are connected in parallel to a live line B.
Referring to fig. 4, a connection mode between the three-phase power supply device E and the fault detection device F is shown, and a power output end of the three-phase power supply device E is electrically connected with the load G. In fig. 4, the three-phase power supply apparatus E includes: commercial alternating current E1, three resistors L1, L2 and L3 arranged on three live wires A, B and C, a slave relay S1 and a master relay S2 arranged before a resistor L1 of the live wire A, and a slave relay S3 and a master relay S4 arranged before a resistor L2 of the live wire B; the fault detection device F includes a voltage detection circuit, a hall sensor, and a processor. The circuit structure of the main circuit in fig. 4 is not shown.
The voltage detection circuit in fig. 4 is configured to detect an analog voltage between any two connected live wires and send the detected analog voltage to the processor, and the hall sensor is configured to detect output currents of any two connected live wires. The processor in fig. 4 is used to implement the following process:
step 1, the three-phase power supply device is powered on, the processor may be, for example, a Micro Controller Unit (MCU) to initialize, and after the initialization of the MCU is finished, the switches of the slave relays S1 and S3 are controlled to be closed to control the PTC resistor to be connected to the circuit.
Step 2, the MCU controls the voltage detection circuit to collect voltage, for example, the voltage U of the line is collectedABNeutral line voltage UBCAnd sending the value to the MCU after signal conditioning. MCU is according to line voltage UABSum line voltage UBCValue, calculating the line voltage U between the live line A and the live line CCA。
A vector operation diagram of the line voltages corresponding to the line voltages of the line voltage a, the line voltage B, and the line voltage C can be shown in fig. 5. In FIG. 5, N is a zero line and satisfies UAB+UBC+UCAA vector operation relationship of 0.
Step 3, MCU judges line voltage UABLine voltage UBCSum line voltage UCAAnd if any line voltage is larger than or equal to another line voltage by more than a certain value, such as 1.5 times, determining that the line voltage of the power supply source of the three-phase power supply equipment is unbalanced.
For example, fig. 6 shows a corresponding obtained line-to-line voltage vector distribution diagram when the live line a and the neutral line N are connected in a wrong manner, and fig. 7 shows a corresponding obtained line-to-line voltage vector distribution diagram when the live line B and the neutral line N are connected in a wrong manner.
Step 4, the MCU controls the Hall sensor to detectMeasuring output current I of live wire B and live wire C after the slave relay is closedBAnd ICMCU receives IBAnd ICThen, according to IBAnd ICCalculating the current I of the live wire AA. If IA、IBAnd ICThe current of any phase is smaller than a certain current value, for example 1A, the live wire corresponding to the current smaller than the certain current value is determined, the fault prompt information of the phase loss is generated, and the fault prompt information and the live wire corresponding to the current smaller than the certain current value are displayed; otherwise, the fault prompt message is a fault of a wrong connection line.
And 5, if the voltage balance between the power supply lines of the three-phase power supply equipment is determined in the step 3, after time delay, the MCU controls the main relay to be switched on, and the PTC relay is switched off in a time delay manner to enter a standby state.
Step 6, after the MCU detects that the rectifier operates, the MCU controls the voltage detection circuit to collect voltage, for example, the voltage U of the line is collectedABSum line voltage UBCAnd sending the value to the MCU after signal conditioning. MCU according to line voltage UABSum line voltage UBCValue, calculating the line voltage U between the live line A and the live line CCA。
Step 7, MCU judges line voltage UABLine voltage UBCSum line voltage UCAAnd if any line voltage is larger than or equal to another line voltage by a certain value, such as more than 1.5 times, determining that the line voltage of the power supply source of the three-phase power supply equipment is unbalanced.
Step 8, the MCU controls the Hall sensors to detect the output currents I of the live wires B and C after the relay is closedBAnd ICMCU receives IBAnd ICThen, according to IBAnd ICCalculating the current I of the live wire AAIf I isA、IBAnd ICWhen any one of the current values is smaller than a certain current value, for example, 1 ampere, and the other two current values are both larger than a certain current value, for example, 5 amperes, the live wire corresponding to the current smaller than 1 ampere is determined, fault prompt information with open phases is generated, and the open phases of the live wire corresponding to the current smaller than 1 ampere are displayed while the fault prompt information is displayed.
And 9, if the operation current is continuously increased and exceeds a certain current value, such as 10 amperes, continuously detected, closing all the loads and the rectifier to avoid fault expansion.
And if the MCU detects that the main relay is switched on after the fault prompt information is displayed and the fault is eliminated in the step 4, the steps 5-9 can be selectively executed. If the slave relay does not exist, the embodiment corresponding to the step 5 to the step 9 can be directly selected and executed.
It should be noted that, for the descriptions of the same steps and the same contents in this embodiment as those in other embodiments, reference may be made to the descriptions in other embodiments, which are not described herein again.
In the embodiment of the application, after the first line voltage and the second line voltage of the three-phase power supply device are obtained, fault analysis is performed on the three-phase power supply device based on the first line voltage and the second line voltage, a fault detection result is obtained, if the fault detection result indicates that the line-to-line voltages are unbalanced, the first output line current and the second output line current of the three-phase power supply device are continuously obtained, and fault prompt information used for indicating the fault type is displayed after the fault type is determined based on the first output line current and the second output line current. Therefore, when the first line voltage and the second line voltage are subjected to fault analysis and the line-to-line voltage is determined to be unbalanced, the first output line current and the second output line current of the three-phase power supply equipment are continuously acquired to determine the specific fault type and display the fault type, the problem that the working efficiency is poor due to the fact that a fault of wiring error or open phase easily occurs in the existing three-phase power supply equipment is solved, the method for effectively detecting the wiring error or open phase fault in advance is achieved, the probability of damage of equipment devices in the three-phase power supply equipment is effectively reduced, and the use reliability of the three-phase power supply equipment is guaranteed.
Based on the foregoing embodiments, embodiments of the present application provide a fault detection apparatus, and as shown in fig. 8, the fault detection apparatus 3 may include: an acquisition unit 31, an analysis unit 32, a determination unit 33, and a display unit 34; wherein:
an acquisition unit 31 for acquiring a first line voltage and a second line voltage of the three-phase power supply apparatus;
the analysis unit 32 is configured to perform fault analysis on the three-phase power supply device based on the first line voltage and the second line voltage to obtain a fault detection result;
the obtaining unit 31 is further configured to obtain a first output line current and a second output line current of the three-phase power supply device if the fault detection result indicates that the line-to-line voltage is unbalanced;
a determination unit 33 for determining a fault type based on the first output line current and the second output line current;
and a display unit 34 for displaying fault indication information indicating the type of the fault.
In other embodiments of the present application, the analysis unit includes: a first determination module and an analysis module; wherein:
a first determining module for determining a third line voltage of the three-phase power supply device based on the first line voltage and the second line voltage;
and the analysis module is used for carrying out fault analysis on the three-phase power supply equipment based on the first line voltage, the second line voltage and the third line voltage to obtain a fault detection result.
In other embodiments of the present application, the analysis module is specifically configured to implement the following steps:
determining a maximum line voltage and a minimum line voltage from the first line voltage, the second line voltage, and the third line voltage;
determining a ratio of maximum line voltage to minimum line voltage;
and if the ratio is larger than or equal to the preset threshold value, determining the fault detection result as line-to-line voltage unbalance.
In other embodiments of the present application, the determining unit includes: a second determination module and a third determination module; wherein:
a second determining module to determine a third output line current based on the first output line current and the second output line current;
a third determination module to determine a fault type based on the first output line current, the second output line current, and the third output line current.
In other embodiments of the present application, the third determining module is specifically configured to implement the following steps:
determining a minimum line current from among the first output line current, the second output line current, and the third output line current when a slave relay connected to the power factor correction device in the three-phase power supply apparatus is turned on; the auxiliary relay is connected in series between the main circuit and a commercial alternating current power supply;
and if the minimum line current is less than or equal to a first preset current threshold value, determining the fault type to be a phase-loss fault.
In other embodiments of the present application, the third determining module is further configured to, if the minimum line current is smaller than the preset current threshold, determine that the fault type is a phase-loss fault, perform the following steps:
determining a first target live wire corresponding to the minimum wire current;
generating first prompt information for prompting the phase loss of the first target live wire;
and displaying the first prompt message.
In other embodiments of the present application, the third determining module is further configured to perform the following steps:
and if the minimum line current is larger than a first preset current threshold value, determining that the fault type is a wrong line connection type.
In other embodiments of the present application, the third determining module is further configured to perform the following steps:
if the second target live wire and the zero line are wrongly connected based on the first line voltage, the second line voltage and the third line voltage, generating second prompt information for prompting the wrong connection of the second target live wire and the zero line;
and displaying the second prompt message.
In other embodiments of the present application, the second determining module is further configured to determine a minimum line current from the first output line current, the second output line current, and the third output line current when the main relay in the three-phase power supply device is in a conducting state;
the third determining module is further configured to determine that the fault type is a phase-loss fault if the minimum line current is less than or equal to a second preset current threshold and currents, except the minimum line current, of the first output line current, the second output line current and the third output line current are all greater than or equal to a third preset current threshold; and the third preset current threshold is greater than the second preset current threshold.
In other embodiments of the present application, the third determining module is configured to perform the following steps after determining that the fault type is a phase-loss fault if the minimum line current is less than or equal to the second preset current threshold and the currents of the first output line current, the second output line current, and the third output line current except the minimum line current are all greater than or equal to the third preset current threshold:
determining a second target live wire corresponding to the minimum wire current;
generating third prompt information for indicating that the second target live wire is open of phase;
and displaying the third prompt message.
In other embodiments of the present application, the third determining module is configured to perform the following steps after determining that the fault type is a phase-loss fault if the minimum line current is less than or equal to the second preset current threshold and the currents of the first output line current, the second output line current, and the third output line current except the minimum line current are all greater than or equal to the third preset current threshold:
if at least one line current of the first output line current, the second output line current and the third output line current is detected to be larger than or equal to a fourth preset current threshold value, controlling a main relay of the three-phase power supply equipment to be in a disconnected state and controlling a load of the three-phase power supply equipment to be in a shutdown state; wherein the fourth predetermined current threshold is greater than the third predetermined current threshold.
It should be noted that, in the embodiment, a specific implementation process of information interaction between the units and the modules may refer to an implementation process in the fault detection method provided in the embodiment corresponding to fig. 1 to 2, and details are not described here.
In the embodiment of the application, after the first line voltage and the second line voltage of the three-phase power supply device are obtained, fault analysis is performed on the three-phase power supply device based on the first line voltage and the second line voltage, a fault detection result is obtained, if the fault detection result indicates that the line-to-line voltages are unbalanced, the first output line current and the second output line current of the three-phase power supply device are continuously obtained, and fault prompt information used for indicating the fault type is displayed after the fault type is determined based on the first output line current and the second output line current. Therefore, when the first line voltage and the second line voltage are subjected to fault analysis and the line-to-line voltage is determined to be unbalanced, the first output line current and the second output line current of the three-phase power supply equipment are continuously acquired to determine the specific fault type and display the fault type, the problem that the working efficiency is poor due to the fact that a fault of wiring error or open phase easily occurs in the existing three-phase power supply equipment is solved, the method for effectively detecting the wiring error or open phase fault in advance is achieved, the probability of damage of equipment devices in the three-phase power supply equipment is effectively reduced, and the use reliability of the three-phase power supply equipment is guaranteed.
Based on the foregoing embodiments, embodiments of the present application provide a fault detection device, and as shown in fig. 9, the fault detection device 4 may include: a detection circuit 41, a processor 42 and a display device 43; wherein:
the detection circuit 41 is used for detecting the voltage between a first live wire and a zero line in the three-phase power supply equipment to obtain a first line voltage, detecting the voltage between a second live wire and the zero line in the three-phase power supply equipment to obtain a second line voltage, and sending the first line voltage and the second line voltage to the processor; the first live wire and the second live wire are any two live wires in the three-phase power supply equipment;
the processor 42 is configured to perform fault analysis on the three-phase power supply device based on the first line voltage and the second line voltage to obtain a fault detection result; if the fault detection result shows that the line-to-line voltage is unbalanced, controlling a detection circuit to detect the line current of the live line of the three-phase power supply equipment;
the detection circuit 41 is further configured to detect an output current of a third live wire in the three-phase power supply device to obtain a first output wire current, detect an output current of a fourth live wire in the three-phase power supply device to obtain a second output wire current, and send the first output wire current and the second output wire current to the processor; the third live wire and the fourth live wire are any two live wires in the three-phase power supply equipment;
a processor 42 for determining a fault type based on the first output line current and the second output line current;
and a display device 43 for displaying the failure prompt information for indicating the type of the failure.
In other embodiments of the present application, the specific implementation process of the processor 42 may refer to implementation processes of the methods shown in fig. 1 to 2, and details are not described here.
Based on the foregoing embodiments, embodiments of the present application provide a three-phase power supply system, and referring to the implementation process of fig. 10, the implementation processes of the methods shown in fig. 1 to 2 may be referred to, and details are not described here.
Based on the foregoing embodiments, an embodiment of the present application provides a computer-readable storage medium, referred to as a storage medium for short, where one or more programs are stored in the computer-readable storage medium, and the one or more programs can be executed by one or more processors to implement a process of implementing a fault detection method as provided in the embodiments corresponding to fig. 1 to 2, which is not described herein again.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application.

Claims (15)

1. A method of fault detection, the method comprising:
acquiring a first line voltage and a second line voltage of the three-phase power supply equipment;
performing fault analysis on the three-phase power supply equipment based on the first line voltage and the second line voltage to obtain a fault detection result;
if the fault detection result shows that the line-to-line voltage is unbalanced, acquiring a first output line current and a second output line current of the three-phase power supply equipment;
determining a fault type based on the first output line current and the second output line current;
and displaying fault prompt information for indicating the fault type.
2. The method of claim 1, wherein the fault detecting the three-phase power supply device based on the first line voltage and the second line voltage to obtain a fault detection result comprises:
determining a third line voltage of the three-phase power supply device based on the first line voltage and the second line voltage;
and carrying out fault analysis on the three-phase power supply equipment based on the first line voltage, the second line voltage and the third line voltage to obtain the fault detection result.
3. The method of claim 2, wherein the performing a fault analysis on the three-phase power supply device based on the first line voltage, the second line voltage, and the third line voltage to obtain the fault detection result comprises:
determining a maximum line voltage and a minimum line voltage from the first line voltage, the second line voltage, and the third line voltage;
determining a ratio of the maximum line voltage to the minimum line voltage;
and if the ratio is larger than or equal to a preset threshold value, determining that the fault detection result is line-to-line voltage imbalance.
4. The method of any of claims 2 to 3, wherein determining the fault type based on the first output line current and the second output line current comprises:
determining a third output line current based on the first output line current and the second output line current;
determining a fault type based on the first output line current, the second output line current, and the third output line current.
5. The method of claim 4, wherein determining the fault type based on the first output line current, the second output line current, and the third output line current comprises:
determining a minimum line current from among the first, second, and third output line currents when a slave relay connected to a power factor correction device in the three-phase power supply apparatus is turned on; the auxiliary relay is connected between the main circuit and a commercial alternating current power supply in series;
and if the minimum line current is less than or equal to a first preset current threshold value, determining that the fault type is a phase-loss fault.
6. The method of claim 5, wherein after determining that the fault type is a phase-loss fault if the minimum line current is less than a predetermined current threshold, the method further comprises:
determining a first target live wire corresponding to the minimum line current;
generating first prompt information for prompting the phase loss of the first target live wire;
and displaying the first prompt message.
7. The method of claim 5, further comprising:
and if the minimum line current is larger than the first preset current threshold, determining that the fault type is a fault line connection type.
8. The method of claim 7, further comprising:
if the second target live wire and the zero line are connected in a wrong way based on the first line voltage, the second line voltage and the third line voltage, generating second prompt information for prompting that the second target live wire and the zero line are connected in a wrong way;
and displaying the second prompt message.
9. The method of claim 4, wherein determining the fault type based on the first output line current, the second output line current, and the third output line current comprises:
determining a minimum line current from among the first, second, and third output line currents in a case where a main relay in the three-phase power supply apparatus is in a conductive state;
if the minimum line current is less than or equal to a second preset current threshold, and the currents except the minimum line current in the first output line current, the second output line current and the third output line current are all greater than or equal to a third preset current threshold, determining that the fault type is a phase-loss fault; wherein the third preset current threshold is greater than the second preset current threshold.
10. The method of claim 9, wherein if the minimum line current is less than or equal to a second predetermined current threshold and the currents of the first, second and third output line currents other than the minimum line current are all greater than or equal to a third predetermined current threshold, after determining that the fault type is a phase-loss fault, the method further comprises:
determining a second target live wire corresponding to the minimum line current;
generating third prompt information for indicating that the second target live wire is open of phase;
and displaying the third prompt message.
11. The method of claim 9, wherein if the minimum line current is less than or equal to a second predetermined current threshold and the currents of the first, second and third output line currents other than the minimum line current are all greater than or equal to a third predetermined current threshold, after determining that the fault type is a phase-loss fault, the method further comprises:
if at least one of the first output line current, the second output line current and the third output line current is detected to be greater than or equal to a fourth preset current threshold value, controlling a main relay of the three-phase power supply equipment to be in an off state and controlling a load of the three-phase power supply equipment to be in an off state; wherein the fourth preset current threshold is greater than the third preset current threshold.
12. A fault detection device, characterized in that the device comprises: the device comprises an acquisition unit, an analysis unit, a determination unit and a display unit; wherein:
the acquiring unit is used for acquiring a first line voltage and a second line voltage of the three-phase power supply equipment;
the analysis unit is used for carrying out fault analysis on the three-phase power supply equipment based on the first line voltage and the second line voltage to obtain a fault detection result;
the obtaining unit is further configured to obtain a first output line current and a second output line current of the three-phase power supply device if the fault detection result indicates that the line-to-line voltage is unbalanced;
the determining unit is configured to determine a fault type based on the first output line current and the second output line current;
and the display unit is used for displaying fault prompt information used for indicating the fault type.
13. A fault detection device, characterized in that the device comprises: a detection circuit, a processor and a display device; wherein:
the detection circuit is used for detecting the voltage between a first live wire and a zero line in the three-phase power supply equipment to obtain a first line voltage, detecting the voltage between a second live wire and the zero line in the three-phase power supply equipment to obtain a second line voltage, and sending the first line voltage and the second line voltage to the processor; wherein the first live line and the second live line are any two live lines of the three-phase power supply equipment;
the processor is used for carrying out fault analysis on the three-phase power supply equipment based on the first line voltage and the second line voltage to obtain a fault detection result; if the fault detection result shows that the line-to-line voltage is unbalanced, controlling the detection circuit to detect the line current of the live line of the three-phase power supply equipment;
the detection circuit is further configured to detect an output current of a third live wire in the three-phase power supply device to obtain a first output wire current, detect an output current of a fourth live wire in the three-phase power supply device to obtain a second output wire current, and send the first output wire current and the second output wire current to the processor; wherein the third live line and the fourth live line are any two live lines of the three-phase power supply equipment;
the processor is configured to determine a fault type based on the first output line current and the second output line current;
and the display device is used for displaying fault prompt information used for indicating the fault type.
14. A three-phase power supply system, characterized in that the three-phase power supply system comprises: a three-phase power supply apparatus for supplying three-phase power and a fault detection apparatus as claimed in claim 13.
15. A storage medium, characterized in that the storage medium has stored thereon a failure detection program which, when executed by a processor, implements the steps of the failure detection method according to any one of claims 1 to 11.
CN202210332963.6A 2021-05-26 2022-03-30 Fault detection method, device, equipment, system and storage medium Pending CN114675205A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202210332963.6A CN114675205A (en) 2022-03-30 2022-03-30 Fault detection method, device, equipment, system and storage medium
EP22810364.4A EP4328602A1 (en) 2021-05-26 2022-05-11 Fault detection method and apparatus, and device, system and storage medium
PCT/CN2022/092193 WO2022247637A1 (en) 2021-05-26 2022-05-11 Fault detection method and apparatus, and device, system and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210332963.6A CN114675205A (en) 2022-03-30 2022-03-30 Fault detection method, device, equipment, system and storage medium

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