A fault detection method, device, apparatus, system and storage medium

Abstract

Embodiments of the present application disclose a fault detection method, which is applied to a fault detection device, the fault detection device is connected with a first live wire and a zero line of a three-phase power supply device to obtain working power, and the method comprises the following steps: detecting a first target voltage and a second target voltage of the three-phase power supply device; wherein the first target voltage and the second target voltage are both line voltages; performing open-phase fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain a first detection result; performing three-phase unbalance fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain a second detection result; and performing zero line connection error fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain a third detection result. Embodiments of the present application also disclose a fault detection device, equipment, system and storage medium.

Description

TECHNICAL FIELD

[0001] The present application relates to the power supply detection technical field, and particularly relates to a fault detection method, device, equipment, system and storage medium. BACKGROUND

[0002] In an application system powered by a three-phase power supply, such as a variable frequency air conditioning system, a three-phase power supply circuit usually includes a three-phase passive power factor correction (PFC) scheme circuit, a three-phase active PFC two-electric square scheme circuit and a three-phase active PFC three-electric square scheme circuit topology. Among them, the main circuit of the three-phase power supply circuit can be used to drive the variable frequency compressor, and one phase can also be led out from the three-phase power supply circuit to rectify the auxiliary power supply separately, and further, the direct current fan driving circuit can also be powered. At present, since the auxiliary power supply is usually powered by the microcontroller for realizing information alarm, when the live wire for supplying power to the auxiliary power supply is missing, the auxiliary power supply does not work, and then the microcontroller also does not work, so it is relatively easy to find the problem of missing the live wire for supplying power to the auxiliary power supply.

[0003] However, if there are other two live wires in addition to the live wire for supplying power to the auxiliary power supply in the three-phase power supply circuit, and / or three-phase voltage imbalance, and / or zero line connection error, etc. exist, the three-phase power supply equipment cannot be operated with load or cannot be operated with large load. At present, there is no method for quickly detecting the above faults, resulting in low fault detection efficiency.

[0004] APPLICATION CONTENT

[0005] To solve the above technical problems, the embodiments of the present application expect to provide a fault detection method, device, equipment, system and storage medium, which solve the problem of low fault detection efficiency in the current three-phase four-wire power supply equipment (referred to as three-phase power supply equipment), and realize a method for quickly detecting the faults of missing phase, or three-phase voltage imbalance, or zero line connection error, etc. in the three-phase four-wire power supply equipment, thereby improving the fault detection efficiency.

[0006] The technical scheme of the present application is realized as follows:

[0007] In a first aspect, a fault detection method is provided, which is applied to a fault detection device, the fault detection device is connected with a first live wire and a zero line of a three-phase power supply equipment to obtain working power, and the method comprises the following steps:

[0008] detecting a first target voltage and a second target voltage of the three-phase power supply equipment; wherein the first target voltage and the second target voltage are both line voltages;

[0009] detect a phase-loss fault of the three-phase power supply equipment based on the first target voltage and the second target voltage, to obtain a first detection result;

[0010] detect a three-phase imbalance fault of the three-phase power supply equipment based on the first target voltage and the second target voltage, to obtain a second detection result;

[0011] detect a zero-line connection fault of the three-phase power supply equipment based on the first target voltage and the second target voltage, to obtain a third detection result.

[0012] In a second aspect, a fault detection device is provided, which is connected to a first live wire and a zero line of a three-phase power supply equipment to obtain working power, and includes a detection unit and a processing unit, wherein:

[0013] the detection unit is configured to detect a first target voltage and a second target voltage of the three-phase power supply equipment, wherein the first target voltage and the second target voltage are both line voltages;

[0014] the processing unit is configured to detect a phase-loss fault of the three-phase power supply equipment based on the first target voltage and the second target voltage, to obtain a first detection result;

[0015] the processing unit is further configured to detect a three-phase imbalance fault of the three-phase power supply equipment based on the first target voltage and the second target voltage, to obtain a second detection result;

[0016] the processing unit is further configured to detect a zero-line connection fault of the three-phase power supply equipment based on the first target voltage and the second target voltage, to obtain a third detection result.

[0017] In a third aspect, a fault detection device is provided, which is connected to a first live wire and a zero line of a three-phase power supply equipment to obtain working power, and includes a detection circuit and a processor, wherein:

[0018] the detection circuit is configured to detect a first target voltage and a second target voltage of the three-phase power supply equipment, and send the first target voltage and the second target voltage to the processor, wherein the first target voltage and the second target voltage are both line voltages;

[0019] The processor is configured to, after receiving the first target voltage and the second target voltage, perform open-phase fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain a first detection result, perform three-phase imbalance fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain a second detection result, and perform zero-line connection fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain a third detection result.

[0020] In a fourth aspect, a three-phase power supply system includes a three-phase power supply device configured to provide three-phase power and a fault detection device as described above.

[0021] 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 according to any one of the preceding aspects.

[0022] In the embodiments of the present application, after detecting the first target voltage and the second target voltage of the three-phase power supply device, the first target voltage and the second target voltage are used to perform open-phase fault detection on the three-phase power supply device to obtain a first detection result, the first target voltage and the second target voltage are used to perform three-phase imbalance fault detection on the three-phase power supply device to obtain a second detection result, and the first target voltage and the second target voltage are used to perform zero-line connection fault detection on the three-phase power supply device to obtain a third detection result. In this way, two line voltages can be used to quickly detect open-phase fault, three-phase imbalance fault and zero-line connection fault, which simplifies the design of the detection circuit, solves the problem of low fault detection efficiency in the current three-phase four-wire power supply device, and implements a method for quickly detecting open-phase, three-phase voltage imbalance or zero-line connection fault in a three-phase four-wire power supply device, thereby improving the fault detection efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Flowchart of the fault detection method provided by the embodiments of the present application Figure 1 ;

[0024] Figure 2 Flowchart of the fault detection method provided by the embodiments of the present application Figure 2 ;

[0025] Figure 3 Flowchart of the fault detection method provided by the embodiments of the present application Figure 3 ;

[0026] Figure 4 Flowchart of the fault detection method provided by the embodiments of the present application Figure 4 ;

[0027] Figure 5 Flowchart of the fault detection method provided by the embodiment of the present application Figure 5 ;

[0028] Figure 6a Circuit topology of a three-phase passive PFC device provided by the embodiment of the present application

[0029] Figure 6b Circuit topology of a three-phase active PFC two-level device provided by the embodiment of the present application

[0030] Figure 6c Circuit topology of a three-phase active PFC three-level device provided by the embodiment of the present application

[0031] Figure 7 Connection diagram between the three-phase power supply device, the voltage detection device and the fault detection device provided by the embodiment of the present application

[0032] Figure 8 Another connection diagram between the three-phase power supply device, the voltage detection device and the fault detection device provided by the embodiment of the present application

[0033] Figure 9 Three-phase voltage vector diagram provided by the embodiment of the present application

[0034] Figure 10 Application scenario diagram provided by the embodiment of the present application

[0035] Figure 11 Circuit design diagram of a voltage detection circuit provided by the embodiment of the present application

[0036] Figure 12 Structure diagram of a fault detection device provided by the embodiment of the present application

[0037] Figure 13 Structure diagram of a fault detection device provided by the embodiment of the present application

[0038] Figure 14 Structure diagram of a three-phase power supply system provided by the embodiment of the present application DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0040] The embodiment of the present application provides a fault detection method, referring to Figure 1As shown, the method is applied to a fault detection device, the fault detection device is connected with a first live wire and a zero wire of a three-phase power supply device to obtain working power, and the method comprises the following steps:

[0041] Step 101, detecting a first target voltage and a second target voltage of the three-phase power supply device.

[0042] The first target voltage and the second target voltage are both line voltages.

[0043] In the embodiment of the present application, the three-phase power supply device can be a three-phase four-wire power supply device for providing three-phase power, that is, the three-phase power supply device comprises three live wires and one zero wire. Since the phase voltage corresponding to the first live wire provides working power for the fault detection device, it can be determined whether the first live wire is open-phase by determining whether the fault detection device is working. Therefore, as long as the fault detection device is working normally, it indicates that the first live wire connected with the fault detection device is not open-phase, but there can be three-phase imbalance and wrong connection. The first target voltage and the second target voltage of the three-phase power supply device can be detected by a voltage detection device. The voltage detection device can be part of the fault detection device or an independent device, but in any case, the fault detection device can manage and control the voltage detection device, and the voltage detection device specifically comprises a detection circuit.

[0044] Step 102, based on the first target voltage and the second target voltage, performing open-phase fault detection on the three-phase power supply device to obtain a first detection result.

[0045] In the embodiment of the present application, the first target voltage and the second target voltage are analyzed to determine whether the other two live wires except the first live wire of the three-phase power supply device are open-phase, and the first detection result is obtained, wherein the first detection result can include two cases of no open-phase fault and open-phase fault of the three-phase power supply device.

[0046] Step 103, based on the first target voltage and the second target voltage, performing three-phase imbalance fault detection on the three-phase power supply device to obtain a second detection result.

[0047] In the embodiment of the present application, the first target voltage and the second target voltage are analyzed to determine whether the three-phase power supply device has three-phase imbalance fault, and the second detection result is obtained, wherein the second detection result includes two cases of no three-phase imbalance fault and three-phase imbalance fault of the three-phase power supply device.

[0048] Step 104, based on the first target voltage and the second target voltage, performing zero line wrong connection fault detection on the three-phase power supply device to obtain a third detection result.

[0049] In the embodiment of the present application, the first target voltage and the second target voltage are analyzed to determine whether a zero line connection error fault exists in the three-phase power supply equipment, and a third detection result is obtained, wherein the third detection result includes two cases that the three-phase power supply equipment does not have a zero line connection error fault and has a zero line connection error fault.

[0050] After the fault detection device executes each or all of steps 102-104, according to the first detection result, the second detection result and / or the third detection result, in the case where it is determined that a fault exists, corresponding fault prompt information is generated, wherein the fault prompt information can indicate the specific fault type, so that the user is prompted to perform a specific fault type troubleshooting operation on the three-phase power supply equipment through the fault prompt information, so that the user can quickly locate the fault problem through the fault prompt information and take appropriate solutions to solve the fault problem. The corresponding fault prompt information can be displayed in the display area corresponding to the fault detection device, or the fault prompt information can be sent to the electronic device in communication connection with the fault detection device, or it can also be realized through the light and / or sound alarm mode set on the fault detection device. Here, it can be determined according to the actual situation, and it can be one or a combination of multiple alarm modes.

[0051] In the embodiment of the present application, after the first target voltage and the second target voltage of the three-phase power supply equipment are detected, the three-phase power supply equipment is subjected to an open-phase fault detection based on the first target voltage and the second target voltage to obtain a first detection result, subjected to a three-phase imbalance fault detection based on the first target voltage and the second target voltage to obtain a second detection result, and subjected to a zero line connection error fault detection based on the first target voltage and the second target voltage to obtain a third detection result. In this way, through two line voltages, the open-phase fault, the three-phase imbalance fault and the zero line connection error fault can be quickly detected, the design of the detection circuit is simplified, the problem of low fault detection efficiency in the current three-phase four-wire power supply equipment is solved, a method for quickly detecting an open-phase fault, a three-phase voltage imbalance or a zero line connection error fault in a three-phase four-wire power supply equipment is realized, and the fault detection efficiency is improved.

[0052] Based on the foregoing embodiment, an embodiment of the present application provides a fault detection method, which, as shown in FIG. Figure 2 The method is applied to a fault detection device connected with a first live wire and a zero line of a three-phase power supply equipment to obtain a working power supply, and the method comprises the following steps:

[0053] Step 201, detecting a first target voltage and a second target voltage of the three-phase power supply equipment.

[0054] The first target voltage and the second target voltage are both line voltages.

[0055] In the embodiments of the present application, the voltage detection device can be fixedly connected with the voltage target output end in the three-phase power supply equipment, or can be selected and accessed by the user according to the user's own needs. The first target voltage and the second target voltage are obtained by detecting any two line voltages of the three-phase power supply equipment through the voltage detection device.

[0056] It should be noted that in some application scenarios, at least two voltage detection devices can be arranged on the three-phase four-wire of the three-phase power supply equipment without considering the cost, and two voltage detection devices for detecting line voltage are selected according to the needs to detect the first target voltage and the second target voltage, wherein the first target voltage and the second target voltage are the effective values of the corresponding line voltage.

[0057] In step 202, if there is a voltage less than the first voltage threshold in the first target voltage and the second target voltage, it is determined that the first detection result is that the three-phase power supply equipment has a fire line open-phase fault.

[0058] The first voltage threshold is greater than 0 and less than times of the phase voltage vector amplitude of the three-phase power supply equipment.

[0059] In the embodiments of the present application, the first voltage threshold is an empirical value obtained according to a large number of experiments, and the value range of the first voltage threshold is The first voltage threshold can also be an empirical value selected and set by the user according to the actual needs in the value range of ; wherein Vm is the phase voltage vector amplitude of the phase voltage signal of the three-phase power supply equipment. Further, the value range of the first voltage threshold can be (5V, 270V). The case that there is a voltage less than the first voltage threshold in the first target voltage and the second target voltage includes the case that only one of the first target voltage and the second target voltage is less than the first voltage threshold and the case that both of the first target voltage and the second target voltage are less than the first voltage threshold.

[0060] When the fault detection device determines that the first detection result is that the three-phase power supply equipment has a fire line open-phase fault, the fault detection device can generate an alarm prompt information that the three-phase power supply equipment has a fire line open-phase fault.

[0061] In step 203, based on the first target voltage and the second target voltage, three-phase unbalance fault detection is performed on the three-phase power supply equipment to obtain a second detection result.

[0062] In the embodiments of the present application, when the second detection result is that the three-phase power supply equipment has a three-phase unbalance fault, the fault detection device can generate an alarm prompt information that the three-phase power supply equipment has a fire line open-phase fault.

[0063] In step 204, the zero-line connection error fault detection is performed on the three-phase power supply equipment based on the first target voltage and the second target voltage, and a third detection result is obtained.

[0064] In the embodiments of the present application, when the third detection result indicates that the three-phase power supply equipment has a zero-line connection error fault, the fault detection device can generate an alarm prompt information indicating that the three-phase power supply equipment has a zero-line connection error fault.

[0065] It should be noted that the detection of the three fault types of the phase absence fault detection, the three-phase imbalance fault detection and the zero-line connection error fault detection needs to be performed in each fault detection process. The detection sequence is to perform the phase absence fault detection first, then perform the three-phase imbalance fault detection regardless of the first detection result to obtain the second detection result, and then perform the zero-line connection error fault detection regardless of the second detection result to obtain the third detection result. However, in some special cases, the three fault detection methods can be executed simultaneously.

[0066] In some application scenarios, the fault detection device can also detect only any two of the fault detections. For example, in the application scenario where the fault detection device performs the phase absence fault detection and the three-phase imbalance fault detection on the three-phase power supply equipment, the fault detection device first performs the phase absence fault detection on the three-phase power supply equipment, and then performs the three-phase imbalance fault detection on the three-phase power supply equipment. In the application scenario where the fault detection device performs the phase absence fault detection and the zero-line connection error fault detection on the three-phase power supply equipment, the fault detection device first performs the phase absence fault detection on the three-phase power supply equipment, and then performs the zero-line connection error fault detection on the three-phase power supply equipment. In the application scenario where the fault detection device performs the three-phase imbalance fault detection and the zero-line connection error fault detection on the three-phase power supply equipment, the detection sequence of the fault detection device is not limited.

[0067] Based on the foregoing embodiments, in other embodiments of the present application, referring to FIG. 2, after the fault detection device performs step 202, the fault detection device can further be used to perform steps 205-207, or steps 208-210. Figure 3

[0068] In step 205, when the common live wire of the first target voltage and the second target voltage is the second live wire, if the first detection result indicates that the three-phase power supply equipment has a live wire phase absence fault, the first maximum voltage of the first target voltage and the second target voltage is determined.

[0069] The second live wire is a live wire different from the first live wire in the three-phase power supply equipment.

[0070] ​In the embodiment of the present application, the three-phase power supply device includes three live lines, i.e., a first live line, a second live line and a third live line, the first live line is currently used to provide working power supply for the fault detection device, since the fault detection device can work normally, it can be determined that the first live line is impossible to have an open-phase situation. In the case that the common live line of the detected first target voltage and second target voltage is the second live line, the maximum voltage of the two voltages is determined from the first target voltage and the second target voltage, to obtain a first maximum voltage.

[0071] In step 206, if the first maximum voltage is greater than or equal to the first voltage threshold, it is determined that the third live line has an open-phase.

[0072] In the embodiment of the present application, the third live line is a live line different from the second live line in the three-phase power supply device.

[0073] In the embodiment of the present application, in the case that the second live line is an A live line, the third live line is a B live line, and the first live line is a C live line, it is assumed that the determined first target voltage is U AB and the second target voltage is U AC , if it is determined that the first maximum voltage is U AC , and U AC is greater than or equal to the first voltage threshold, it can be determined that the third live line B has an open-phase.

[0074] In step 207, first prompt information indicating that the third live line has an open-phase is generated.

[0075] In step 208, in the case that the common live line of the first target voltage and the second target voltage is the first live line, and the first detection result indicates that the three-phase power supply device has a live line open-phase fault, a reference voltage smaller than the first voltage threshold is determined from the first target voltage and the second target voltage.

[0076] In the embodiment of the present application, it is assumed that the determined first target voltage is U BC and the second target voltage is U AC , if U AC is smaller than the first voltage threshold, it can be determined that U AC is the reference voltage; if U BC is smaller than the first voltage threshold, it can be determined that U BC is the reference voltage; if U AC and U BC are both smaller than the first voltage threshold, it can be determined that U AC and U BC are both the reference voltages.

[0077] In step 209, a live line other than the first live line corresponding to the reference voltage is determined to have an open-phase.

[0078] In the embodiment of the present application, U ACWhen using the reference voltage, determine that the second live wire A is missing a phase; U BC When using the reference voltage, determine that the first live wire B is missing a phase; U AC with U BC Both are reference voltages, indicating that both the first live wire B and the second live wire A are missing a phase.

[0079] Step 210: Generate a second prompt message to indicate the phase loss of the live wire other than the first live wire corresponding to the reference voltage.

[0080] Based on the foregoing embodiments, in other embodiments of this application, reference is made to... Figure 4 As shown, before executing step 203, the fault detection device can also be used to execute steps 211 to 212:

[0081] Step 211: Determine the third target voltage based on the first target voltage and the second target voltage.

[0082] In this embodiment, three line voltages can be determined from the three-phase power supply equipment. Therefore, the third line voltage can be determined from two line voltages using a vector operation formula between line voltages. For example, assume the determined first target voltage is U. BC The second target voltage is U AC At that time, the third target voltage U AB =U AC -U BC .

[0083] Step 212: Determine the second maximum voltage, intermediate voltage, and minimum voltage from the first target voltage, the second target voltage, and the third target voltage.

[0084] Among them, the second maximum voltage is greater than the intermediate voltage, and the intermediate voltage is greater than the minimum voltage.

[0085] In this embodiment, the first target voltage, the second target voltage, and the third target voltage are sorted by size to determine the second maximum voltage with the largest effective voltage value, the middle voltage with the middle effective voltage value, and the minimum voltage with the smallest effective voltage value.

[0086] Based on the foregoing embodiments, in other embodiments of this application, reference is made to... Figure 4 As shown, after the fault detection device executes step 212, the corresponding step 203 can be implemented by steps 203a to 203b:

[0087] Step 203a: Determine the first ratio between the second maximum voltage and the minimum voltage.

[0088] In the embodiments of this application, the first ratio = second maximum voltage / minimum voltage.

[0089] Step 203b, if the first ratio is greater than or equal to the first threshold value, determining that the second detection result is that the three-phase power supply equipment has a three-phase imbalance fault.

[0090] The first threshold value is greater than 1.

[0091] In the embodiments of the present application, the first threshold value is an empirical value greater than 1 obtained from a large number of experiments, or an empirical value greater than 1 set by an operation and maintenance personnel according to experience.

[0092] Based on the foregoing embodiments, in other embodiments of the present application, step 204 can be implemented by steps 204a-204c:

[0093] Step 204a, determining a first ratio between the second maximum voltage and the minimum voltage.

[0094] Step 204b, determining a second ratio between the intermediate voltage and the minimum voltage.

[0095] In the embodiments of the present application, the second ratio = intermediate voltage / minimum voltage.

[0096] Step 204c, determining a third detection result based on the first ratio and the second ratio.

[0097] In the embodiments of the present application, the first ratio and the second ratio are analyzed to determine the third detection result.

[0098] Based on the foregoing embodiments, in other embodiments of the present application, step 204c can be implemented by steps a11-a13:

[0099] Step a11, determining an error coefficient.

[0100] The error coefficient is greater than or equal to 0 and less than or equal to 0.3.

[0101] In the embodiments of the present application, the error coefficient is an empirical value in the range of 0 to 0.3 obtained from a large number of experiments, or an empirical value in the range of 0 to 0.3 set by an operation and maintenance personnel according to experience.

[0102] Step a12, determining a second threshold value, a third threshold value, and a fourth threshold value based on the error coefficient.

[0103] The second threshold value is less than the third threshold value, and the fourth threshold value is greater than or equal to 1.

[0104] In the embodiments of the present application, the error coefficient is analyzed by different threshold value determination methods to determine the second threshold value, the third threshold value, and the fourth threshold value.

[0105] Step a13, if the first ratio is greater than or equal to the second threshold value, and the first ratio is less than or equal to the third threshold value, and the second ratio is greater than or equal to 1, and the second ratio is less than or equal to the fourth threshold value, determining that the third detection result is that the three-phase power supply equipment exists the zero line connection error fault.

[0106] In the embodiment of the application, if the second threshold value ≤ the first ratio ≤ the third threshold value, and 1 ≤ the second ratio ≤ the fourth threshold value, it is determined that the third detection result is that the three-phase power supply equipment exists the zero line connection error fault.

[0107] Based on the foregoing embodiment, in other embodiments of the application, step a12 can be implemented by steps b11-b13:

[0108] Step b11, determining the difference value between the first ratio and the error coefficient, to obtain the second threshold value.

[0109] In the embodiment of the application,

[0110] Step b12, determining the sum value between the first ratio and the error coefficient, to obtain the third threshold value.

[0111] In the embodiment of the application,

[0112] Step b13, determining the sum value between 1 and the error coefficient, to obtain the fourth threshold value.

[0113] In the embodiment of the application, the fourth threshold value = 1 + the error coefficient.

[0114] Based on the foregoing embodiment, in other embodiments of the application, referring to Figure 5 As shown in the figure, after the fault detection device executes step 204, it can also be used to execute steps 213-214, or steps 215-216; wherein if the fire line corresponding to the second maximum voltage does not include the first fire line, steps 213-214 can be selected to be executed, and if the fire line corresponding to the second maximum voltage includes the first fire line, steps 215-216 can be selected to be executed:

[0115] Step 213, if the fire line corresponding to the second maximum voltage does not include the first fire line, determining that the first fire line and the zero line are connected in reverse.

[0116] In the embodiment of the application, since the fire line corresponding to the second maximum voltage does not include the first fire line used to provide power for the fault detection device, it can be determined that the first fire line and the zero line are connected in reverse, that is, the first fire line is mistaken for the zero line, and the zero line is currently mistaken for the fire line.

[0117] Step 214, generating third prompt information used to indicate that the first fire line and the zero line are connected in reverse.

[0118] Step 215, if the second maximum voltage corresponds to the first live wire, determining that the live wire other than the two live wires corresponding to the second maximum voltage in the three-phase power supply device is connected reversely with the neutral wire.

[0119] In the embodiments of the present application, when the live wire corresponding to the second maximum voltage is the first live wire, it is assumed that the second maximum voltage is U AC , it can be determined that the live wire B other than the live wires A and C corresponding to the second maximum voltage in the three-phase power supply device is connected reversely with the neutral wire.

[0120] Step 216, generating fourth prompt information for indicating that the live wire other than the two live wires corresponding to the second maximum voltage in the three-phase power supply device is connected reversely with the neutral wire.

[0121] It should be noted that step 207 or step 210, and step 214 or step 216 can be executed simultaneously, that is, after the fault detection device executes step 206 to determine that the third live wire is open phase, step 207 is not executed, or after step 209 is executed to determine that the live wire other than the first live wire corresponding to the reference voltage is open phase, step 210 is not executed, and / or, after step 213 is executed to determine that the first live wire is connected reversely with the neutral wire, step 214 is not executed, or after step 215 is executed to determine that the live wire other than the two live wires corresponding to the second maximum voltage in the three-phase power supply device is connected reversely with the neutral wire, step 216 is not executed, but a fifth prompt information is generated according to the third live wire being open phase or the live wire other than the first live wire corresponding to the reference voltage being open phase, and / or, the first live wire being connected reversely with the neutral wire or the live wire other than the two live wires corresponding to the second maximum voltage in the three-phase power supply device being connected reversely with the neutral wire, that is, the fifth prompt information includes the information of the specific live wire being open phase or the specific live wire being connected reversely with the neutral wire. In this way, the prompt information of which live wire is open phase or which live wire is connected reversely with the neutral wire is generated, which helps the operation and maintenance personnel to quickly solve the fault of the corresponding live wire, and improves the efficiency of solving the fault problem.

[0122] For example, assuming that the user's electrical equipment is a variable frequency compressor, the circuit topology of a three-phase passive PFC device including a main circuit driving a variable frequency compressor, an auxiliary circuit for separately rectifying to supply power to an auxiliary power supply and to supply power to a DC fan driving circuit can be referred to as shown in Figure 6a ; the circuit topology of a three-phase active PFC two-level device including a main circuit driving a variable frequency compressor, an auxiliary circuit for separately rectifying to supply power to an auxiliary power supply and to supply power to a DC fan driving circuit can be referred to as shown in Figure 6b ; and the circuit topology of a three-phase active PFC three-level device including a main circuit driving a variable frequency compressor, an auxiliary circuit for separately rectifying to supply power to an auxiliary power supply and to supply power to a DC fan driving circuit can be referred to as shown in Figure 6c .

[0123] Referring toFigure 7 or Figure 8 The connection mode between the three-phase power supply device E, the voltage detection device F and the fault detection device G is shown in the figure. The power output end of the three-phase power supply device E is electrically connected with the user power supply device H, and the live wire C and the neutral wire N of the three-phase power supply device provide working power for the fault detection device. Among them, Figure 7 and Figure 8 , the three-phase power supply device E includes: the city alternating current E1, three resistors L1, L2 and L3 arranged on the three live wires A, B and C, and the neutral wire N; the voltage detection device includes a voltage detection circuit; the fault detection device includes a processor, which can be a microcontroller (Micro Control Unit, MCU). Among them, Figure 7 , the voltage detection device F is arranged at the current input end side of the three resistors L1, L2 and L3, and Figure 8 , the voltage detection device F is arranged at the current output end side of the three resistors L1, L2 and L3. Among them, the voltage vector diagram between the live wires A, B and C and the neutral wire N in the three-phase power supply device can refer to Figure 9 .

[0124] Among them, Figure 7 and Figure 8 , the voltage detection device, i.e. the voltage detection circuit, is used to detect the analog voltage between the determined two voltage lines of the voltage to be detected, and send the detected analog voltage to the processor of the fault detection device G. Figure 7 and Figure 8 , the fault detection device is used to realize the following three steps: analog-to-digital (Analog-to-Digital, A / D) conversion of the received analog voltage to obtain a numerical voltage value; power phase failure diagnosis analysis of the numerical voltage value to obtain a fault detection result; and generating corresponding prompt information based on the fault detection result. In some application scenarios, the processor can be a microcontroller.

[0125] Taking the connection mode between the three-phase power supply device E and the voltage detection device F shown in Figure 7 as an example for corresponding illustration, after the line voltage V AC between the live wire A and the live wire C and the line voltage effective value V BC between the live wire B and the live wire C are collected by the voltage detection device F including two voltage detection circuits as shown in Figure 10 , they are sent to the fault detection device G. The fault detection device G calculates the corresponding voltage effective values U AC and U BC according to the line voltage V AC and V BC , and generates the prompt information according to V AB = V AC -VBC The line voltage between the live wire A and the live wire B is calculated, and according to V AB The corresponding voltage effective value U AB can be calculated. Then fault diagnosis is performed, including:

[0126] (1) First, determine whether the input power line live wire has a phase failure:

[0127] Determine the size relationship between the collected U AC and U BC and the first voltage threshold value;

[0128] If U AC and / or U BC is less than the first voltage threshold value, it is determined that there is a live wire phase failure;

[0129] Wherein, the first voltage threshold value is in the range of Preferably, the specific value range of the first voltage threshold value is (5V, 270V).

[0130] If there is a live wire phase failure, the following steps can also be performed:

[0131] If U AC is less than the first voltage threshold value, it is determined that the A-phase live wire has a phase failure;

[0132] If U BC is less than the first voltage threshold value, it is determined that the B-phase live wire has a phase failure.

[0133] (2) Then diagnose whether there is a three-phase imbalance fault:

[0134] From U AC , U BC and U AB , obtain the maximum effective value and the minimum effective value among the three;

[0135] Calculate the ratio of the maximum effective value and the minimum effective value, denoted as M;

[0136] If M≥K, it is determined that there is a three-phase imbalance fault;

[0137] Wherein, K is a first threshold value, K is greater than 1; Preferably, the value range of K is [1.1, 1.7].

[0138] Wherein, if there is a three-phase imbalance, U AC , U BC and U AB are not completely equal, the greater the imbalance, the greater the difference between the maximum effective value and the minimum effective value, so the ratio between the maximum effective value and the minimum effective value can be used to analyze whether there is a three-phase imbalance fault.

[0139] (3) Diagnose whether there is a zero line reverse connection fault:

[0140] U AC , U BC and U AB are sorted in descending order to obtain the maximum valid value MAX, the intermediate valid value MID and the minimum valid value MIN;

[0141] If MAX, MID and MIN satisfy and 1≤(MID÷MIN)≤(1+R), it is determined that there is a zero line reverse connection fault; wherein R is an error coefficient, R takes a value in the range [0, 0.3].

[0142] If it is determined that there is a zero line reverse connection fault, the following steps can also be performed:

[0143] If the line voltage corresponding to MAX does not contain the common live wire C, it is determined that the common live wire C phase is connected reversely with the zero line N;

[0144] If the line voltage corresponding to MAX contains the common live wire C and another live wire, it is determined that the live wire other than the line voltage containing the common live wire C and another live wire is connected reversely with the zero line N.

[0145] Based on the connection mode between the three-phase power supply device E and the voltage detection device F shown in Figure 8 or Figure 9 , the voltage detection device F can also simultaneously include 3 voltage detection circuits for collecting line voltage V BA , line voltage V CB and line voltage V AC , and in actual application process, only any two voltage detection circuits can be used to collect the corresponding voltage to obtain the first target voltage and the second target voltage, but in some application scenarios, the three voltage detection circuits can also be directly used to detect the first target voltage, the second target voltage and the third target voltage.

[0146] It should be noted that the voltage detection circuit in the foregoing Figure 10 can refer to that shown in Figure 11 , which includes resistors R1, R2, R3 and R4, an operational amplifier Y, a DC power supply DC, and GND is the ground terminal. The two terminals where R1 and R2 are located are the voltage input terminals of the voltage detection circuit, and the output terminal of the operational amplifier Y is the output terminal of the voltage detection circuit.

[0147] Among them, according to V AB = V AC -V BC , the line voltage between the live wire A and the live wire B can be calculated as shown in the following table under different fault conditions:

[0148]

[0149] Wherein, a1, a2 and a3 are determined by the three-phase unbalance degree, V AC , V BC and V AB and Vm are multiple relationships.

[0150] It should be noted that the first, second and third fire lines can be interchanged in actual process.

[0151] It should be noted that the same steps and the same content in the embodiment and other embodiments can refer to the description in other embodiments, and will not be repeated here.

[0152] In the embodiment of the application, after detecting the first target voltage and the second target voltage of the three-phase power supply equipment, the three-phase power supply equipment is detected for open-phase fault based on the first target voltage and the second target voltage to obtain a first detection result, the three-phase power supply equipment is detected for three-phase unbalance fault based on the first target voltage and the second target voltage to obtain a second detection result, and the three-phase power supply equipment is detected for zero line connection error fault based on the first target voltage and the second target voltage to obtain a third detection result. In this way, the open-phase fault, the three-phase unbalance fault and the zero line connection error fault can be quickly detected through two line voltages, the design of the detection circuit is simplified, the problem of low fault detection efficiency in the current three-phase four-wire power supply equipment is solved, a method for quickly detecting the open-phase, three-phase voltage imbalance or zero line connection error fault in the three-phase four-wire power supply equipment is realized, and the fault detection efficiency is improved.

[0153] Based on the foregoing embodiment, the embodiment of the application provides a fault detection device, which is connected with the first fire line and the zero line of the three-phase power supply equipment to obtain working power supply, and refers to Figure 12 , the fault detection device 3 can include a detection unit 31 and a processing unit 32; wherein:

[0154] The detection unit 31 is configured to detect a first target voltage and a second target voltage of the three-phase power supply equipment; wherein the first target voltage and the second target voltage are both line voltages.

[0155] The processing unit 32 is configured to detect an open-phase fault of the three-phase power supply equipment based on the first target voltage and the second target voltage to obtain a first detection result.

[0156] The processing unit 32 is further configured to detect a three-phase unbalance fault of the three-phase power supply equipment based on the first target voltage and the second target voltage to obtain a second detection result.

[0157] The processing unit 32 is further configured to perform zero-line connection error detection on the three-phase power supply device based on the first target voltage and the second target voltage, to obtain a third detection result.

[0158] In other embodiments of the present application, when the processing unit 32 is configured to perform open-phase fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain the first detection result, the following steps can be implemented:

[0159] If there is a voltage less than the first voltage threshold in the first target voltage and the second target voltage, it is determined that the first detection result indicates that the three-phase power supply device has a live-line open-phase fault; wherein the first voltage threshold is greater than 0 and less than times of the phase voltage vector amplitude of the three-phase power supply device.

[0160] In other embodiments of the present application, the fault detection apparatus further comprises a determination unit and a generation unit, wherein after the processing unit is configured to perform open-phase fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain the first detection result:

[0161] The determination unit is configured to, in a case where the common live line of the first target voltage and the second target voltage is the second live line, if the first detection result indicates that the three-phase power supply device has a live-line open-phase fault, determine a first maximum voltage in the first target voltage and the second target voltage; wherein the second live line is a live line different from the first live line in the three-phase power supply device;

[0162] The determination unit is further configured to, if the first maximum voltage is greater than or equal to the first voltage threshold, determine that the third live line is open-phase; wherein the third live line is a live line different from the second live line in the three-phase power supply device;

[0163] The generation unit is configured to generate first prompt information indicating that the third live line is open-phase.

[0164] In other embodiments of the present application, after the processing unit is configured to perform open-phase fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain the first detection result:

[0165] The determination unit is configured to, in a case where the common live line of the first target voltage and the second target voltage is the first live line and the first detection result indicates that the three-phase power supply device has a live-line open-phase fault, determine a reference voltage less than the first voltage threshold in the first target voltage and the second target voltage;

[0166] The determination unit is further configured to determine that the live line corresponding to the reference voltage other than the first live line is open-phase;

[0167] The generation unit is configured to generate second prompt information indicating that the live line corresponding to the reference voltage other than the first live line is open-phase.

[0168] In other embodiments of the present application, before the processing unit is configured to implement three-phase imbalance fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain a second detection result, the processing unit is configured to implement the following steps:

[0169] The determining unit is further configured to determine a third target voltage based on the first target voltage and the second target voltage.

[0170] The determining unit is further configured to determine the second maximum voltage, the intermediate voltage and the minimum voltage from the first target voltage, the second target voltage and the third target voltage; wherein the second maximum voltage is greater than the intermediate voltage, and the intermediate voltage is greater than the minimum voltage.

[0171] In other embodiments of the present application, when the processing unit is configured to implement three-phase imbalance fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain a second detection result, the following steps can be implemented:

[0172] Determine a first ratio between the second maximum voltage and the minimum voltage.

[0173] If the first ratio is greater than or equal to a first threshold value, determine that the second detection result is that the three-phase power supply device has a three-phase imbalance fault; wherein the first threshold value is in a range greater than 1.

[0174] In other embodiments of the present application, when the processing unit is configured to implement zero line connection fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain a third detection result, the following steps can be implemented:

[0175] Determine a first ratio between the second maximum voltage and the minimum voltage.

[0176] Determine a second ratio between the intermediate voltage and the minimum voltage.

[0177] Determine the third detection result based on the first ratio and the second ratio.

[0178] In other embodiments of the present application, when the processing unit is configured to determine the third detection result based on the first ratio and the second ratio, the following steps can be implemented:

[0179] Determine an error coefficient; wherein the error coefficient is greater than or equal to 0 and less than or equal to 0.3.

[0180] Determine a second threshold value, a third threshold value and a fourth threshold value based on the error coefficient; wherein the second threshold value is less than the third threshold value, and the fourth threshold value is greater than or equal to 1.

[0181] If the first ratio is greater than or equal to the second threshold value, and the first ratio is less than or equal to the third threshold value, and the second ratio is greater than or equal to 1, and the second ratio is less than or equal to the fourth threshold value, it is determined that the third detection result is that the three-phase power supply equipment has a zero line connection error fault.

[0182] In other embodiments of the present application, when the processing unit is used to determine the second threshold value, the third threshold value and the fourth threshold value based on the error coefficient, the following steps can be used to achieve this:

[0183] determining the difference between 1 and the error coefficient to obtain the second threshold value;

[0184] determining the sum of 1 and the error coefficient to obtain the third threshold value;

[0185] determining the sum of 1 and the error coefficient to obtain the fourth threshold value.

[0186] In other embodiments of the present application, after the processing unit is used to implement zero line connection error fault detection on the three-phase power supply equipment based on the first target voltage and the second target voltage to obtain the third detection result:

[0187] The determining unit is also used to determine that the first fire line is connected in reverse with the zero line if the fire line corresponding to the second maximum voltage does not include the first fire line.

[0188] The generating unit is also used to generate third prompt information indicating that the first fire line is connected in reverse with the zero line.

[0189] The determining unit is also used to determine that the fire line other than the two fire lines corresponding to the second maximum voltage in the three-phase power supply equipment is connected in reverse with the zero line if the fire line corresponding to the second maximum voltage includes the first fire line.

[0190] The generating unit is also used to generate fourth prompt information indicating that the fire line other than the two fire lines corresponding to the second maximum voltage in the three-phase power supply equipment is connected in reverse with the zero line.

[0191] It should be noted that the specific implementation process of information interaction between units and modules in this embodiment can refer to the implementation process of the fault detection method provided in the corresponding embodiments, which will not be described here. Figures 1 to 5 The implementation process in the fault detection method provided in the corresponding embodiments, which will not be described here.

[0192] In the embodiment of the present application, after detecting the first target voltage and the second target voltage of the three-phase power supply equipment, the three-phase power supply equipment is detected for open-phase fault based on the first target voltage and the second target voltage to obtain a first detection result, the three-phase power supply equipment is detected for three-phase imbalance fault based on the first target voltage and the second target voltage to obtain a second detection result, and the three-phase power supply equipment is detected for zero line connection error fault based on the first target voltage and the second target voltage to obtain a third detection result. In this way, the open-phase fault, the three-phase imbalance fault and the zero line connection error fault can be quickly detected through two line voltages, the design of the detection circuit is simplified, the problem of low fault detection efficiency in the current three-phase four-wire power supply equipment is solved, a method for quickly detecting the open-phase, three-phase voltage imbalance or zero line connection error fault in the three-phase four-wire power supply equipment is realized, and the fault detection efficiency is improved.

[0193] Based on the foregoing embodiment, the embodiment of the present application provides a fault detection device. The fault detection device is connected with the first live wire and the zero line of the three-phase power supply equipment to obtain working power supply. As shown in Figure 13 , the fault detection device 4 can include a detection circuit 41 and a processor 42. Wherein:

[0194] The detection circuit 41 is configured to detect the first target voltage and the second target voltage of the three-phase power supply equipment and send the first target voltage and the second target voltage to the processor. Wherein, the first target voltage and the second target voltage are both line voltages.

[0195] The processor 42 is configured to, after receiving the first target voltage and the second target voltage, detect the three-phase power supply equipment for open-phase fault based on the first target voltage and the second target voltage to obtain a first detection result, detect the three-phase power supply equipment for three-phase imbalance fault based on the first target voltage and the second target voltage to obtain a second detection result, and detect the three-phase power supply equipment for zero line connection error fault based on the first target voltage and the second target voltage to obtain a third detection result.

[0196] In other embodiments of the present application, the specific implementation process of the processor 42 can refer to the implementation process of the method shown in Figures 1 to 5 . Here, it will not be described in detail. It should be noted that when the fault detection device includes a voltage detection device, the detection circuit 41 is the voltage detection circuit described above.

[0197] Based on the foregoing embodiment, the embodiment of the present application provides a three-phase power supply system. As shown in Figure 14 , the three-phase power supply system 5 can include a three-phase power supply equipment 51 for providing three-phase power and a fault detection device 52 for implementing the fault detection method of Figures 1 to 5 . Wherein: the specific implementation process of the fault detection device 52 can refer to the implementation process of the fault detection method.Figures 1 to 5 The implementation process of the method is not described in detail here. In addition, the three-phase power supply device 51 and the three-phase power supply device E described above are the same device, and the fault detection device 52 and the fault detection device G described above are the same device.

[0198] Based on the foregoing embodiments, the embodiments of the present application provide a computer-readable storage medium, referred to as a storage medium, which stores one or more programs executable by one or more processors to implement the method as Figures 1 to 5 The implementation process of the fault detection method provided by the corresponding embodiments is not described here.

[0199] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage, etc.) containing computer-usable program code.

[0200] The present application is described with reference to flowcharts and / or block diagrams according to the methods, devices (systems), and computer program products of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more blocks.

[0201] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction apparatus that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more blocks.

[0202] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable data processing apparatus to produce a computer-implemented process, so that the instructions executed on the computer or other programmable data processing apparatus provide a process for implementing the functions specified in the flowcharts and / or block diagrams.Figure 1 one or more processes and / or functions described in one or more blocks Figure 1 one or more blocks or any combination thereof.

[0203] The above description is only preferred embodiments of the present application, and not intended to limit the protection scope of the present application.

Claims

1. A fault detection method characterized by, The method is applied to a fault detection device, the fault detection device is connected with a first fire line and a zero line of a three-phase power supply device to obtain working power, and the method comprises: detecting a first target voltage and a second target voltage of the three-phase power supply device; wherein the first target voltage and the second target voltage are any two line voltages in the three-phase power supply device; based on the first target voltage and the second target voltage, performing open-phase fault detection on the three-phase power supply device to obtain a first detection result; based on the first target voltage and the second target voltage, performing three-phase imbalance fault detection on the three-phase power supply device to obtain a second detection result; based on the first target voltage and the second target voltage, performing zero line connection error fault detection on the three-phase power supply device to obtain a third detection result; wherein, after the first target voltage and the second target voltage, the method further comprises: in the case that the common fire line of the first target voltage and the second target voltage is the second fire line, if the first detection result indicates that the three-phase power supply device has a fire line open-phase fault, a first maximum voltage in the first target voltage and the second target voltage is determined; wherein the second fire line is a fire line different from the first fire line in the three-phase power supply device; if the first maximum voltage is greater than or equal to a first voltage threshold, a third fire line is determined to be open-phase; wherein the third fire line is a fire line different from the second fire line in the three-phase power supply device; generating first prompt information for indicating that the third fire line is open-phase.

2. The method of claim 1, wherein, The first target voltage and the second target voltage, the method further comprises: If there is a voltage less than a first voltage threshold in the first target voltage and the second target voltage, it is determined that the first detection result is that the three-phase power supply equipment has a fire line open-phase fault; wherein the first voltage threshold is greater than 0 and less than times the phase voltage vector amplitude of the three-phase power supply equipment.

3. The method of claim 2, wherein, after the first target voltage and the second target voltage, the method further comprises: in the case that the common fire line of the first target voltage and the second target voltage is the first fire line, and the first detection result indicates that the three-phase power supply device has a fire line open-phase fault, a reference voltage smaller than the first voltage threshold in the first target voltage and the second target voltage is determined; determining that the reference voltage corresponds to an open-phase fire line other than the first fire line; generating second prompt information for indicating that the reference voltage corresponds to an open-phase fire line other than the first fire line.

4. The method according to any one of claims 1 to 3, characterized in that, Before the three-phase imbalance fault detection based on the first target voltage and the second target voltage, the method further comprises: determining a third target voltage based on the first target voltage and the second target voltage; from the first target voltage, the second target voltage and the third target voltage, determining a second maximum voltage, an intermediate voltage and a minimum voltage; wherein the second maximum voltage is greater than the intermediate voltage, and the intermediate voltage is greater than the minimum voltage.

5. The method of claim 4, wherein, The three-phase unbalance fault detection is performed on the three-phase power supply equipment based on the first target voltage and the second target voltage, and a second detection result is obtained, including: determining a first ratio between the second maximum voltage and the minimum voltage; if the first ratio is greater than or equal to a first threshold value, determining that the second detection result is that the three-phase power supply equipment has a three-phase unbalance fault; wherein the first threshold value is in a range greater than 1.

6. The method of claim 4, wherein, The zero line connection error fault detection is performed on the three-phase power supply equipment based on the first target voltage and the second target voltage, and a third detection result is obtained, including: determining a first ratio between the second maximum voltage and the minimum voltage; determining a second ratio between the intermediate voltage and the minimum voltage; determining the third detection result based on the first ratio and the second ratio.

7. The method of claim 6, wherein, The third detection result is determined based on the first ratio and the second ratio, including: determining an error coefficient; wherein the error coefficient is greater than or equal to 0 and less than or equal to 0.3; determining a second threshold value, a third threshold value and a fourth threshold value based on the error coefficient; wherein the second threshold value is less than the third threshold value, and the fourth threshold value is greater than or equal to 1; if the first ratio is greater than or equal to the second threshold value, and the first ratio is less than or equal to the third threshold value, and the second ratio is greater than or equal to 1, and the second ratio is less than or equal to the fourth threshold value, determining that the third detection result is that the three-phase power supply equipment has a zero line connection error fault.

8. The method of claim 7, wherein, The second threshold value, the third threshold value and the fourth threshold value are determined based on the error coefficient, including: determining a difference between the error coefficient and the second threshold value. determining a sum of the error coefficients, resulting in the third threshold value; determining a sum of 1 and the error coefficient to obtain the fourth threshold value.

9. The method according to any one of claims 6 to 8, characterized in that, After the zero line connection error fault detection is performed on the three-phase power supply equipment based on the first target voltage and the second target voltage, and the third detection result is obtained, the method further includes: if the firewire corresponding to the second maximum voltage does not include the first firewire, determining that the first firewire and the zero line are connected in reverse; generating third prompt information indicating that the first firewire and the zero line are connected in reverse; if the firewire corresponding to the second maximum voltage includes the first firewire, determining that the firewire other than the two firewires corresponding to the second maximum voltage in the three-phase power supply equipment and the zero line are connected in reverse; generating fourth prompt information indicating that the firewire other than the two firewires corresponding to the second maximum voltage in the three-phase power supply equipment and the zero line are connected in reverse.

10. A fault detection apparatus characterized by comprising: The fault detection device is connected with the first firewire and the zero line of the three-phase power supply equipment to obtain working power supply, and the device includes: a detection unit and a processing unit; wherein: The detection unit is configured to detect a first target voltage and a second target voltage of the three-phase power supply equipment; wherein the first target voltage and the second target voltage are any two line voltages in the three-phase power supply equipment; The processing unit is configured to perform open-phase fault detection on the three-phase power supply equipment based on the first target voltage and the second target voltage, and obtain a first detection result. The processing unit is further configured to perform three-phase imbalance fault detection on the three-phase power supply device based on the first target voltage and the second target voltage, and obtain a second detection result; The processing unit is further configured to perform zero line connection error fault detection on the three-phase power supply device based on the first target voltage and the second target voltage, and obtain a third detection result; After the step of performing phase absence fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain a first detection result, the processing unit is further configured to: In a case where the common live wire of the first target voltage and the second target voltage is a second live wire, if the first detection result indicates that the three-phase power supply device has a live wire phase absence fault, a first maximum voltage in the first target voltage and the second target voltage is determined; wherein the second live wire is different from the first live wire in the three-phase power supply device; If the first maximum voltage is greater than or equal to a first voltage threshold, a third live wire is determined to be absent; wherein the third live wire is different from the second live wire in the three-phase power supply device; First prompt information indicating that the third live wire is absent is generated.

11. A fault detection device, characterized by The fault detection device is connected with a first live wire and a zero line of a three-phase power supply device to obtain working power supply, and the device comprises a detection circuit and a processor; wherein: The detection circuit is configured to detect a first target voltage and a second target voltage of the three-phase power supply device, and send the first target voltage and the second target voltage to the processor; wherein the first target voltage and the second target voltage are any two line voltages in the three-phase power supply device; The processor is configured to, after receiving the first target voltage and the second target voltage, perform phase absence fault detection on the three-phase power supply device based on the first target voltage and the second target voltage, and obtain a first detection result; perform three-phase imbalance fault detection on the three-phase power supply device based on the first target voltage and the second target voltage, and obtain a second detection result; perform zero line connection error fault detection on the three-phase power supply device based on the first target voltage and the second target voltage, and obtain a third detection result; After the step of performing phase absence fault detection on the three-phase power supply device based on the first target voltage and the second target voltage to obtain a first detection result, the processor is further configured to: In a case where the common live wire of the first target voltage and the second target voltage is a second live wire, if the first detection result indicates that the three-phase power supply device has a live wire phase absence fault, a first maximum voltage in the first target voltage and the second target voltage is determined; wherein the second live wire is different from the first live wire in the three-phase power supply device; If the first maximum voltage is greater than or equal to a first voltage threshold, a third live wire is determined to be absent; wherein the third live wire is different from the second live wire in the three-phase power supply device; First prompt information indicating that the third live wire is absent is generated.

12. A three-phase power supply system, characterized by The three-phase power supply system comprises a three-phase power supply device for providing three-phase power and the fault detection device as claimed in claim 11.

13. A storage medium, characterized by The storage medium has stored thereon a fault detection program, which, when executed by the processor, implements the steps of the fault detection method as claimed in any one of claims 1 to 9.

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