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

Abstract

This application discloses a fault detection method, comprising: detecting a first target voltage and a second target voltage of a three-phase power supply device; wherein neither the first target voltage nor the second target voltage includes the phase voltage corresponding to the first live wire; determining a fault detection result based on the first target voltage and the second target voltage; wherein the fault detection result is used to indicate whether the three-phase power supply device has a live wire phase loss fault; if the fault detection result indicates that the three-phase power supply device has a live wire phase loss fault, generating a first prompt message; wherein the first prompt message is used to indicate that the three-phase power supply device has a live wire phase loss fault. This application also discloses a fault detection device, equipment, system, and storage medium.

Description

Technical Field

[0001] This application relates to the field of power supply detection technology, and in particular to a fault detection method, apparatus, equipment, system and storage medium. Background Technology

[0002] In three-phase power supply systems, such as variable frequency air conditioning systems, the three-phase power supply circuits typically include three-phase passive power factor correction (PFC) circuits, three-phase active PFC two-level circuits, and three-phase active PFC three-level circuit topologies. The main circuit of the three-phase power supply circuit can drive the variable frequency compressor, and one phase can be drawn from the three-phase power supply circuit to separately rectify and power the auxiliary power supply. Furthermore, it can also power the DC fan drive circuit. Currently, since the auxiliary power supply is usually connected to the microcontroller that implements information alarms, if a phase is missing on the live wire supplying the auxiliary power supply, the auxiliary power supply will not operate, and the microcontroller will also not operate. This makes it relatively easy to detect the problem of a missing phase on the live wire supplying the auxiliary power supply.

[0003] However, if two of the live wires in a three-phase power supply circuit, other than the live wire that supplies power to the auxiliary power supply, are missing a phase, it does not affect the auxiliary power supply. Currently, there is no method to quickly detect whether the other two live wires are missing a phase, resulting in low phase loss detection efficiency.

[0004] Application content

[0005] To address the aforementioned technical problems, this application aims to provide a fault detection method, apparatus, device, system, and storage medium. This solves the problem of low phase loss detection efficiency in current three-phase four-wire power supply equipment (hereinafter referred to as three-phase power supply equipment), and realizes a method for quickly detecting phase loss problems in three-phase four-wire power supply equipment and issuing alarms, thereby improving phase loss detection efficiency.

[0006] The technical solution of this application is implemented as follows:

[0007] In a first aspect, a fault detection method is provided, the method being applied to a fault detection device, the fault detection device being connected to the first live wire and neutral wire of a three-phase power supply to obtain a working power supply, the method comprising:

[0008] The first target voltage and the second target voltage of the three-phase power supply equipment are detected; wherein neither the first target voltage nor the second target voltage includes the phase voltage corresponding to the first live wire;

[0009] Based on the first target voltage and the second target voltage, a fault detection result is determined; wherein, the fault detection result is used to indicate whether the three-phase power supply equipment has a live wire phase loss fault;

[0010] If the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, a first prompt message is generated; wherein, the first prompt message is used to indicate that the three-phase power supply equipment has a live wire phase loss fault.

[0011] Secondly, a fault detection device is provided, wherein the fault detection device is connected to the first live wire and neutral wire of a three-phase power supply equipment to obtain operating power, the device comprising: a detection unit, a determination unit, and a generation unit; wherein:

[0012] The detection unit is used to detect the first target voltage and the second target voltage of the three-phase power supply equipment; wherein neither the first target voltage nor the second target voltage includes the phase voltage corresponding to the first live wire;

[0013] The determining unit is used to determine the fault detection result based on the first target voltage and the second target voltage; wherein the fault detection result is used to indicate whether the three-phase power supply equipment has a live wire phase loss fault;

[0014] The generation unit is used to generate a first prompt message if the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault; wherein, the first prompt message is used to prompt that the three-phase power supply equipment has a live wire phase loss fault.

[0015] Thirdly, a fault detection device is provided, wherein the fault detection device is connected to the first live wire and neutral wire of a three-phase power supply to obtain operating power, the device comprising: a detection circuit and a processor; wherein:

[0016] The detection circuit is used 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, neither the first target voltage nor the second target voltage includes the phase voltage corresponding to the first live wire;

[0017] The processor is configured to receive the first target voltage and the second target voltage, and determine a fault detection result based on the first target voltage and the second target voltage; wherein the fault detection result is used to indicate whether the three-phase power supply equipment has a live wire phase loss fault; if the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, a first prompt message is generated; wherein the first prompt message is used to indicate that the three-phase power supply equipment has a live wire phase loss fault.

[0018] Fourthly, a three-phase power supply system, the three-phase power supply system comprising: a three-phase power supply device for providing three-phase power and a fault detection device as described above.

[0019] Fifthly, a storage medium storing a fault detection program, which, when executed by a processor, implements the steps of the fault detection method as described in any of the preceding claims.

[0020] In this embodiment, after detecting the first target voltage and the second target voltage of the three-phase power supply equipment, a fault detection result is determined based on the first target voltage and the second target voltage. If the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, a first prompt message is generated. Thus, by analyzing the two target voltages of the three-phase power supply equipment to obtain the fault detection result, and generating a first prompt message when the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, this solves the problem of low phase loss detection efficiency in current three-phase four-wire power supply equipment. It realizes a method for quickly detecting phase loss problems in three-phase four-wire power supply equipment and issuing an alarm, thereby improving the phase loss detection efficiency. Attached Figure Description

[0021] Figure 1 Flowchart of the fault detection method provided in the embodiments of this application Figure 1 ;

[0022] Figure 2 Flowchart of the fault detection method provided in the embodiments of this application Figure 2 ;

[0023] Figure 3 Flowchart of the fault detection method provided in the embodiments of this application Figure 3 ;

[0024] Figure 4 Flowchart of the fault detection method provided in the embodiments of this application Figure 4 ;

[0025] Figure 5 Flowchart of the fault detection method provided in the embodiments of this application Figure 5 ;

[0026] Figure 6 Flowchart of the fault detection method provided in the embodiments of this application Figure 6 ;

[0027] Figure 7a A circuit topology diagram of a three-phase passive PFC device provided in this application embodiment;

[0028] Figure 7b A circuit topology diagram of a three-phase active PFC two-level device provided in this application embodiment;

[0029] Figure 7c A circuit topology diagram of a three-phase active PFC three-level device provided in this application embodiment;

[0030] Figure 8 A schematic diagram illustrating the connection between a three-phase power supply device, a voltage detection device, and a fault detection device provided in an embodiment of this application;

[0031] Figure 9 A schematic diagram illustrating the connection between another three-phase power supply device, voltage detection device, and fault detection device provided in an embodiment of this application;

[0032] Figure 10 A schematic diagram of a three-phase voltage vector provided in an embodiment of this application;

[0033] Figure 11a This application provides an example of an application scenario. Figure 1 ;

[0034] Figure 11b This application provides an example of an application scenario. Figure 2 ;

[0035] Figure 11c This application provides an example of an application scenario. Figure 3 ;

[0036] Figure 11d This application provides an example of an application scenario. Figure 4 ;

[0037] Figure 12 A circuit design schematic diagram of a voltage detection circuit provided in an embodiment of this application;

[0038] Figure 13 This is a schematic diagram of the structure of a fault detection device provided in an embodiment of this application;

[0039] Figure 14 This is a schematic diagram of the structure of a fault detection device provided in an embodiment of this application;

[0040] Figure 15 This is a schematic diagram of a three-phase power supply system provided in an embodiment of this application. Detailed Implementation

[0041] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0042] The embodiments of this application provide a fault detection method, referring to... Figure 1 As shown, the method is applied to a fault detection device. The fault detection device is connected to the first live wire and neutral wire of a three-phase power supply to obtain working power. The method includes the following steps:

[0043] Step 101: Detect the first target voltage and the second target voltage of the three-phase power supply equipment.

[0044] Neither the first target voltage nor the second target voltage includes the phase voltage corresponding to the first live wire.

[0045] In this embodiment, the three-phase power supply equipment can be a three-phase four-wire power supply equipment for providing three-phase power, i.e., the three-phase power supply equipment includes three live wires and one neutral wire. Since the phase voltage corresponding to the first live wire provides the working power for the fault detection equipment, it can be determined whether the first live wire is missing a phase by determining whether the fault detection equipment is working. Therefore, when analyzing whether the three-phase power supply equipment is missing a phase, the situation of the phase voltage corresponding to the first live wire does not need to be considered. The first target voltage and the second target voltage of the three-phase power supply equipment can be obtained by a voltage detection device. The voltage detection device can be part of the fault detection equipment or an independent device, but in either case, the fault detection equipment can manage and control the voltage detection device.

[0046] Step 102: Determine the fault detection result based on the first target voltage and the second target voltage.

[0047] Among them, the fault detection results are used to indicate whether a live phase loss fault has occurred in the three-phase power supply equipment.

[0048] In this embodiment of the application, the first target voltage and the second target voltage are analyzed to determine whether there is a phase loss in the other two live wires besides the first live wire in the three-phase power supply equipment.

[0049] Step 103: If the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, generate the first prompt message.

[0050] The first prompt message is used to indicate that there is a live phase loss fault in the three-phase power supply equipment.

[0051] In this embodiment, if the fault detection result indicates that the three-phase power supply equipment is not experiencing a phase loss, the three-phase power supply equipment is controlled to provide normal operating power to the user's electrical equipment. If the fault detection result indicates that the three-phase power supply equipment is experiencing a phase loss, the three-phase power supply equipment is controlled to temporarily stop providing operating power to the user's electrical equipment, and a first prompt message indicating the phase loss is generated. The generated first prompt message can be displayed in the display area corresponding to the fault detection equipment, or it can be sent to a display device with a communication link to the fault detection equipment, such as a computer device or smart mobile terminal device, such as a mobile phone, used by the management personnel monitoring the three-phase power supply equipment. In this way, an alarm for a phase loss in the three-phase power supply equipment is realized, so that the user can repair the live wire of the three-phase power supply equipment according to the first prompt message to overcome the defect of phase loss and effectively ensure the safety and quality of the user's electrical equipment.

[0052] In this embodiment, after detecting the first target voltage and the second target voltage of the three-phase power supply equipment, a fault detection result is determined based on the first target voltage and the second target voltage. If the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, a first prompt message is generated. Thus, by analyzing the two target voltages of the three-phase power supply equipment to obtain the fault detection result, and generating a first prompt message when the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, this solves the problem of low phase loss detection efficiency in current three-phase four-wire power supply equipment. It realizes a method for quickly detecting phase loss problems in three-phase four-wire power supply equipment and issuing an alarm, thereby improving the phase loss detection efficiency.

[0053] Based on the foregoing embodiments, embodiments of this application provide a fault detection method, referring to... Figure 2 As shown, the method is applied to a fault detection device. The fault detection device is connected to the first live wire and neutral wire of a three-phase power supply to obtain working power. The method includes the following steps:

[0054] Step 201: Detect the first target voltage and the second target voltage of the three-phase power supply equipment.

[0055] Neither the first target voltage nor the second target voltage includes the phase voltage corresponding to the first live wire.

[0056] In this embodiment, the voltage detection device can be fixedly connected to the voltage target terminal in the three-phase power supply equipment, or the user can select and connect the voltage target terminal in the three-phase power supply equipment according to their own needs. The voltage detection device detects the two voltages of the three-phase power supply equipment other than the phase voltage corresponding to the first live wire to obtain the first target voltage and the second target voltage.

[0057] It should be noted that in some application scenarios, if cost is not a concern, at least two voltage detection devices can be installed on the three-phase four-wire of a three-phase power supply equipment. Two of these voltage detection devices can be selected according to requirements to detect the first target voltage and the second target voltage.

[0058] Step 202: Determine the first effective value of the first target voltage and the second effective value of the second target voltage.

[0059] In this embodiment, when the heating effect of alternating current (AC) is equal to that of direct current (DC) at a certain voltage, the voltage of the DC can be considered the effective value of the AC voltage. The effective value of the corresponding voltage can be determined by the formula... The calculation yields u(t), where u(t) is the first or second target voltage signal, T is the voltage change period, and ∫ is the integration operator. Ideally, taking a sinusoidal voltage signal as an example of a three-phase power supply target voltage signal, the corresponding effective voltage value can be calculated by dividing the peak value of the sinusoidal voltage signal by the square root of 2.

[0060] Step 203: Determine the fault detection result based on the first effective value and the second effective value.

[0061] In this embodiment of the application, the first effective value and the second effective value are analyzed to determine the fault detection result.

[0062] Step 204: If the fault detection result indicates that there is a phase loss fault in the three-phase power supply equipment, generate the first prompt message.

[0063] The first prompt message is used to indicate that there is a live phase loss fault in the three-phase power supply equipment.

[0064] In this embodiment of the application, when the fault detection result indicates that the three-phase power supply equipment has a phase loss fault, a first prompt message is generated and displayed. Specifically, after generating the first prompt message, the fault detection device sends it to a terminal device with a communication connection to the fault detection device, such as a user's smartphone, so that the user is aware that the three-phase power supply equipment currently has a phase loss fault.

[0065] Based on the foregoing embodiments, in other embodiments of this application, step 203 can be implemented by steps 203a to 203b:

[0066] Step 203a: If both the first target voltage and the second target voltage are line voltages, determine the first minimum effective value and the maximum effective value from the first effective value and the second effective value.

[0067] In this embodiment, if the first valid value is less than the second valid value, then the first minimum valid value is the first valid value; if the second valid value is less than the first valid value, then the first minimum valid value is the second valid value. If the first valid value and the second valid value are equal, then the first minimum valid value can be the first valid value, and the maximum valid value can also be the first valid value.

[0068] Step 203b: If the first minimum effective value is less than the first voltage threshold, determine that the fault detection result is that there is a phase loss fault in the three-phase power supply equipment.

[0069] Among them, the first voltage threshold is greater than 0 and less than 0. The phase voltage vector amplitude is times that of the phase voltage vector.

[0070] In this embodiment, the first voltage threshold is an empirical value obtained from numerous experiments, and the range of the first voltage threshold is [insert range here]. Where Vm is the signal amplitude of the target voltage signal of the three-phase power supply equipment. Furthermore, the range of the first voltage threshold can be (5V, 270V).

[0071] That is, when both the first target voltage and the second target voltage are line voltages, if there is a voltage in the first target voltage and the second target voltage that is less than the first voltage threshold, the fault detection result is determined to be a live wire phase loss fault in the three-phase power supply equipment.

[0072] Based on the foregoing embodiments, in other embodiments of this application, when step 203 is implemented by executing steps 203a to 203b, refer to... Figure 3 As shown, after executing step 203, the fault detection device is further configured to select either steps 205-206 or steps 207-210. Specifically, if the common live wire for the first target voltage and the second target voltage is a live wire other than the first live wire, steps 205-206 are selected; if the common live wire for the first target voltage and the second target voltage is the first live wire, steps 207-210 are selected.

[0073] Step 205: If the common live wire for the first target voltage and the second target voltage is a live wire other than the first live wire, and the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, and the maximum effective value is greater than or equal to the first voltage threshold, then it is determined that there is a live wire phase loss other than the first live wire and the common live wire.

[0074] In the embodiments of this application, when the first minimum valid value is the first valid value, the maximum valid value is the second valid value; when the first minimum valid value is the second valid value, the maximum valid value is the first valid value.

[0075] For example, if the first live wire is live wire B in a three-phase power supply device, and the maximum effective value is determined to be the voltage value between live wire C and live wire B. The minimum effective value is the voltage U between live wire A and live wire B. AB When the voltage is 0, assuming the first voltage threshold is Vm, it can be determined that phase A of the live wire is missing.

[0076] Step 206: Generate a second prompt message to indicate a phase loss of live wires other than the first live wire and the common live wire.

[0077] Step 207: If the common live wire of the first target voltage and the second target voltage is the first live wire, and the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, and the maximum effective value is greater than or equal to the first voltage threshold, determine the live wire phase loss other than the first live wire corresponding to the minimum effective value.

[0078] Step 208: Generate a third prompt message to indicate the phase loss of the live wire other than the first live wire corresponding to the first minimum effective value.

[0079] Step 209: If the common live wire of the first target voltage and the second target voltage is the first live wire, and the fault detection result indicates that there is a phase loss fault in the three-phase power supply equipment, and the maximum effective value is less than the first voltage threshold, it is determined that all live wires in the three-phase power supply equipment except the first live wire are phase loss.

[0080] In this embodiment, if both the maximum effective value and the minimum effective value are detected to be less than a first voltage threshold, it can be determined that the other two live wires in the three-phase power supply equipment, excluding the first live wire, are missing a phase. For example, when the common live wire for the first target voltage and the second target voltage is live wire C, the voltage value U between live wire C and live wire A is detected. CA =0, the minimum effective value is the voltage U between the C live wire and the B live wire. CB When the value is 0, it can be determined that both live wire A and live wire B are missing a phase.

[0081] Step 210: Generate a fourth prompt message to indicate that all live wires except the first live wire in the three-phase power supply equipment are missing a phase.

[0082] In cases where the common live wire for the first target voltage and the second target voltage is the first live wire, steps 207-208 or steps 209-210 can be selected to be executed depending on the situation.

[0083] It should be noted that steps 206, 208, or 210 can be executed simultaneously with step 204, or steps 206, 208, or 210 can be executed after step 207. Furthermore, a second or third prompt message is provided to indicate to the user which live wire is missing, allowing the user to quickly perform the corresponding repairs on the indicated missing live wire.

[0084] Based on the foregoing embodiments, in other embodiments of this application, step 203 can be implemented by steps 203c to 203d:

[0085] Step 203c: If both the first target voltage and the second target voltage are phase voltages, determine the second minimum effective value from the first effective value and the second effective value.

[0086] Among them, the first target voltage and the second target voltage are independent of the first live wire.

[0087] In this embodiment, the first target voltage can be the voltage between the second live wire and the neutral wire, and the corresponding second target voltage can be the voltage between the third live wire and the neutral wire; or the first target voltage can be the voltage between the third live wire and the neutral wire, and the second target voltage can be the voltage between the second live wire and the neutral wire.

[0088] Step 203d: If the second minimum effective value is less than the second voltage threshold, the fault detection result is determined to be a live wire phase loss fault in the three-phase power supply equipment.

[0089] In this embodiment, the second voltage threshold can be an empirical value obtained from a large number of experiments, and the range of the second voltage threshold is (0, Vm). Further, the range of the second voltage threshold is (5V, 150V).

[0090] Based on the foregoing embodiments, in other embodiments of this application, when step 203 is implemented by steps 203c to 203d, refer to... Figure 4 As shown, after executing step 203d, the fault detection device is also used to execute steps 211-212 or steps 213-214. Specifically, if the fault detection result indicates a single-phase live wire fault in the three-phase power supply equipment, and the first effective value is less than the second voltage threshold, steps 211-212 are executed; if the fault detection result indicates a single-phase live wire fault in the three-phase power supply equipment, and the second effective value is less than the second voltage threshold, steps 213-214 are executed.

[0091] Step 211: If the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, and the first effective value is less than the second voltage threshold, determine the live wire phase loss corresponding to the first target voltage.

[0092] In this embodiment, when the first target voltage is the voltage between the second live wire and the neutral wire, if the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, and the first effective value is less than the second voltage threshold, then the second live wire is determined to be missing a phase. When the first target voltage is the voltage between the third live wire and the neutral wire, if the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, and the first effective value is less than the second voltage threshold, then the third live wire is determined to be missing a phase.

[0093] Step 212: Generate a fifth prompt message to indicate the missing phase of the live wire corresponding to the first target voltage.

[0094] Step 213: If the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, and the second effective value is less than the second voltage threshold, determine the live wire phase loss corresponding to the second target voltage.

[0095] In this embodiment, when the second target voltage is the voltage between the second live wire and the neutral wire, if the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, and the second effective value is less than the second voltage threshold, then the second live wire phase loss is determined. When the second target voltage is the voltage between the third live wire and the neutral wire, if the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, and the second effective value is less than the second voltage threshold, then the third live wire phase loss is determined.

[0096] Step 214: Generate a sixth prompt message to indicate the missing phase of the live wire corresponding to the second target voltage.

[0097] In this embodiment of the application, step 212 or step 214 can be executed simultaneously with step 204, or step 212 or step 214 can be executed after step 205.

[0098] Based on the foregoing embodiments, in other embodiments of this application, step 203 can be implemented by step 203e:

[0099] Step 203e: If the first target voltage is a phase voltage and the second target voltage is a line voltage, and the first target voltage and the second target voltage share the second live wire, if the first effective value is less than the third voltage threshold, or the second effective value is less than the fourth voltage threshold, the fault detection result is determined to be a live wire phase loss fault in the three-phase power supply equipment.

[0100] Among them, the third voltage threshold is greater than 0 and less than the phase voltage vector magnitude, and the fourth voltage threshold is greater than 0 and less than... The phase voltage vector amplitude is times that of the first live wire, and the second live wire is different from the first live wire.

[0101] In this embodiment, the third voltage threshold is an empirical value obtained from numerous experiments, and the fourth voltage threshold is also an empirical value obtained from numerous experiments. Typically, the ranges of the third and fourth voltage thresholds are different. Specifically, the range of the third voltage threshold is (0, Vm); the range of the fourth voltage threshold is... Furthermore, the range of the third voltage threshold can be (5V, 150V), and the range of the fourth voltage threshold is (5V, 270V).

[0102] Based on the foregoing embodiments, referring to Figure 5 As shown, after executing step 203e, the fault detection device is also used to execute steps 215 to 216:

[0103] Step 215: If the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, and the first effective value is greater than or equal to the third voltage threshold, and the second effective value is less than the fourth voltage threshold, then the third live wire phase loss is determined.

[0104] The third live wire is the live wire in a three-phase power supply device that is not the first or second live wire.

[0105] Step 216: Generate a seventh prompt message to indicate the absence of a phase on the third live wire.

[0106] In some application scenarios, step 216 can be executed simultaneously with step 204.

[0107] Based on the foregoing embodiments, in other embodiments of this application, step 203 can also be implemented by step 203f:

[0108] Step 203f: If the first target voltage is a phase voltage and the second target voltage is a line voltage, and the live wire corresponding to the second target voltage is different from the live wire corresponding to the first target voltage, if the first effective value is less than the fifth voltage threshold, or the second effective value is less than the sixth voltage threshold, the fault detection result is determined to be a phase loss fault in the three-phase power supply equipment.

[0109] Among them, the fifth voltage threshold is greater than 0 and less than the phase voltage vector magnitude, and the sixth voltage threshold is greater than 0 and less than... The phase voltage vector amplitude is times that of the phase voltage vector.

[0110] In this embodiment, since neither the first target voltage nor the second target voltage includes the phase voltage corresponding to the first live wire, the first target voltage can be the phase voltage between the second live wire and the neutral wire. Correspondingly, since the live wire corresponding to the second target voltage is different from the live wire corresponding to the first target voltage, the second target voltage can be the phase voltage between the third live wire and the first live wire, or the first target voltage can be the phase voltage between the third live wire and the neutral wire, and the corresponding second target voltage can be the phase voltage between the second live wire and the first live wire.

[0111] The fifth voltage threshold is an empirical value obtained from numerous experiments, and the sixth voltage threshold is also an empirical value obtained from numerous experiments. Typically, the ranges for the fifth and sixth voltage thresholds are different. Specifically, the range for the fifth voltage threshold is (0, Vm); the range for the sixth voltage threshold is... Furthermore, the fifth voltage threshold can be in the range of (5V, 150V), and the sixth voltage threshold can be in the range of (5V, 270V).

[0112] Based on the foregoing embodiments, in other embodiments of this application, reference is made to... Figure 6As shown, after executing step 203f, the fault detection device is also used to execute steps 217-218 or steps 219-220. Specifically, if the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault and the first effective value is less than the fifth voltage threshold, steps 217-218 are selected to be executed; if the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault and the second effective value is less than the sixth voltage threshold, steps 219-220 are selected to be executed.

[0113] Step 217: If the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, and the first effective value is less than the fifth voltage threshold, determine the live wire phase loss corresponding to the first target voltage.

[0114] In the embodiments of this application, when the first target voltage is the phase voltage between the second live wire and the neutral wire, it is determined that the second live wire is missing a phase; or when the first target voltage is the phase voltage between the third live wire and the neutral wire, it is determined that the third live wire is missing a phase.

[0115] Step 218: Generate an eighth prompt message to indicate the missing phase of the live wire corresponding to the first target voltage.

[0116] Step 219: If the fault detection result indicates that there is a phase loss fault in the three-phase power supply equipment, and the second effective value is less than the sixth voltage threshold, determine the fourth phase loss corresponding to the second target voltage.

[0117] Among them, the fourth live wire is the live wire in the three-phase power supply equipment other than the first live wire and the live wire corresponding to the first target voltage.

[0118] In the embodiments of this application, when the second target voltage is the phase voltage between the second live wire and the neutral wire, it is determined that the second live wire is missing a phase, that is, the fourth live wire is the second live wire; or when the second target voltage is the phase voltage between the third live wire and the neutral wire, it is determined that the third live wire is missing a phase, that is, the fourth live wire is the third live wire.

[0119] Step 220: Generate a ninth prompt message to indicate the loss of the fourth live wire phase.

[0120] For example, assuming 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 the variable frequency compressor, an auxiliary circuit for separately rectifying and supplying power to the auxiliary power supply, and powering the DC fan drive circuit, can be referred to... Figure 7a The circuit topology of a three-phase active PFC two-level device, including a main circuit driving a variable frequency compressor and an auxiliary circuit used for separate rectification to power the auxiliary power supply and the DC fan drive circuit, can be referenced. Figure 7bThe circuit topology of a three-phase active PFC three-level device, including a main circuit driving a variable frequency compressor and an auxiliary circuit used for separate rectification to power the auxiliary power supply and the DC fan drive circuit, can be referenced. Figure 7c As shown.

[0121] Reference Figure 8 or Figure 9 The diagram shows the connection between the three-phase power supply device E, the voltage detection device F, and the fault detection device G. The power output terminal of the three-phase power supply device E is electrically connected to the user's power supply device H. The live wire C and neutral wire N of the three-phase power supply device provide power to the fault detection device. Figure 8 and Figure 9 In the three-phase power supply device E, the components include: AC mains power E1, three resistors L1, L2, and L3 installed on the three live wires A, B, and C, and a neutral wire N; the voltage detection device includes a voltage detection circuit; and the fault detection device includes a processor. Among these, in... Figure 8 The medium voltage detection device F is installed at the current input terminals of the three resistors L1, L2, and L3. Figure 9 The voltage detection device F is installed at the current output terminals of the three resistors L1, L2, and L3. The voltage vector diagram between the live wires A, B, and C and the neutral wire N in a three-phase power supply system can be found by referring to... Figure 10 As shown.

[0122] in, Figure 8 and Figure 9 The voltage detection device, or voltage detection circuit, is used to detect the analog voltage between two specific voltage lines that need to be detected, and sends the detected analog voltage to the processor of the fault detection device G. Figure 8 and Figure 9 The fault detection equipment in the system performs the following three steps: converting the received analog voltage into an analog-to-digital (A / D) value to obtain a numerical voltage value; performing power supply phase loss fault diagnosis analysis on 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.

[0123] by Figure 8 The connection method between the three-phase power supply equipment E and the voltage detection device F shown is used as an example to illustrate the corresponding explanation. Figure 11a The circuit shown is used to acquire the line voltage V between live wire A and live wire B through a voltage detection device F, which includes two voltage detection circuits. BA The line voltage V between live wire B and live wire C CB Then it is sent to the fault detection device G. The fault detection device G determines the fault based on the line voltage V. BA and V CBCalculate the corresponding effective voltage value U BA and U CB From the effective value of voltage U BA and U CB The maximum and minimum effective values ​​are determined; if the minimum effective value is less than a first voltage threshold, it is determined that there is a phase loss problem in the live wire; the range of the first voltage threshold can be... Preferably, the first voltage threshold can be (5V, 270V). Further, if the maximum effective value is less than the first voltage threshold, then live wire B is determined to be missing a phase; otherwise, live wire A is determined to be missing a phase. In this embodiment, Vm is the phase voltage vector amplitude. After detecting two sets of line voltages, the vector amplitudes obtained under different phase loss conditions can be as shown in Table 1.

[0124] Table 1

[0125]

[0126] In passing Figure 11b The circuit shown is used to acquire the phase voltage V between the live wire A and the neutral wire N through a voltage detection device including two voltage detection circuits. AN The phase voltage V between the live wire B and the neutral wire N BN This is then sent to the fault detection equipment. The fault detection equipment determines the fault based on the phase voltage V. AN and V BN Calculate the corresponding effective voltage value U AN and U BN From the effective value of voltage U AN and U BN The maximum and minimum effective values ​​are determined; if the minimum effective value is less than a first voltage threshold, a phase loss in the live wire is identified; the first voltage threshold can range from (0, Vm); preferably, the first voltage threshold can be (5V, 150V). Further, if the phase voltage U... AN If the voltage is less than the first voltage threshold, then live wire A is considered to be missing a phase; if the phase voltage U BN If the voltage is less than the first voltage threshold, then the live wire B is determined to be missing a phase. In this embodiment, Vm is the phase voltage vector amplitude. Two sets of phase voltages are detected, and the vector amplitudes obtained under different phase loss conditions are shown in Table 2.

[0127] In passing Figure 11c The circuit shown is used to acquire the phase voltage V between the live wire A and the neutral wire N through a voltage detection device including two voltage detection circuits. AN The line voltage V between live wire A and live wire B AB This data is then sent to the fault detection equipment, indicating that one of the live wires in the detected line voltage is the same live wire as the live wire in the detected phase voltage. The fault detection equipment then determines the fault based on the phase voltage V. ANand line voltage V AB Calculate the corresponding effective voltage value U AN and U AB If the effective value of the phase voltage U AN Less than the first voltage threshold, or the effective value of the line voltage U AB If the voltage is less than the second voltage threshold, a phase loss on the live wire is determined to exist; wherein, the range of the first voltage threshold can be (0, Vm); preferably, the first voltage threshold can be (5V, 150V); the range of the second voltage threshold can be... Preferably, the second voltage threshold can be (5V, 270V). Further, if the effective value of the phase voltage U... AN If the voltage is less than the first voltage threshold, then live wire A is considered to be missing a phase; if the effective value of the phase voltage U AN The voltage is greater than the first voltage threshold and the effective value of the line voltage U AB If the voltage is less than the second voltage threshold, then the live wire B is determined to be missing a phase. In this embodiment, Vm is the phase voltage vector amplitude. Two sets of voltages are detected, and the phase voltage BN and line voltage V are collected according to different phase loss conditions. BA The vector magnitudes obtained from the analysis are shown in Table 3.

[0128] Table 2

[0129]

[0130] Table 3

[0131]

[0132] In passing Figure 11d The circuit shown is used to acquire the phase voltage V between the live wire A and the neutral wire N through a voltage detection device including two voltage detection circuits. AN The line voltage V between live wire B and live wire C BC This data is then sent to the fault detection equipment, indicating that one of the live wires in the detected inter-line voltage is not the same live wire as the live wire in the detected phase voltage. The fault detection equipment then determines the fault based on the phase voltage V. AN and line voltage V BC Calculate the corresponding effective voltage value U AN and U BC If the effective value of the phase voltage U AN Less than the first voltage threshold, or the effective value of the line voltage U BC If the voltage is less than the second voltage threshold, a phase loss on the live wire is determined to exist; wherein, the range of the first voltage threshold can be (0, Vm); preferably, the first voltage threshold can be (5V, 150V); the range of the second voltage threshold can be... Preferably, the second voltage threshold can be (5V, 270V). Further, if the effective value of the phase voltage U...AN If the voltage is less than the first voltage threshold, then live wire A is considered to be missing a phase; if the effective value of the line voltage U BC If the voltage is less than the second voltage threshold, then the live wire B is determined to be missing a phase. In this embodiment, Vm is the phase voltage vector amplitude. Two sets of voltages are detected, and the vector amplitudes obtained under different phase loss conditions are shown in Table 4.

[0133] Table 4

[0134]

[0135] In some application scenarios, phase voltage V can also be collected. BN and line voltage V AC Let's analyze it.

[0136] based on Figure 8 or Figure 9 The connection method between the three-phase power supply equipment E and the voltage detection device F shown in the figure may also include a device for collecting line voltage V. BA Line voltage V CB Line voltage V AC Phase voltage V AN and phase voltage V BN The system has five voltage detection circuits, and in practical applications, only one circuit needs to be activated, such as... Figures 11a-11d In the corresponding embodiment, two voltage detection circuits are used to collect the corresponding voltages to obtain the first target voltage and the second target voltage.

[0137] It should be noted that the aforementioned Figures 11a-11d The voltage detection circuit in the reference can be found here. Figure 12 As shown, it includes: resistors R1, R2, R3 and R4, operational amplifier Y, DC power supply DC, 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 operational amplifier Y is the output terminal of the voltage detection circuit.

[0138] It should be noted that the first, second, and third fire wires can be interchanged in actual operation.

[0139] It should be noted that the descriptions of the same steps and contents as in other embodiments in this embodiment can be found in the descriptions in other embodiments, and will not be repeated here.

[0140] In this embodiment, after detecting the first target voltage and the second target voltage of the three-phase power supply equipment, a fault detection result is determined based on the first target voltage and the second target voltage. If the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, a first prompt message is generated. Thus, by analyzing the two target voltages of the three-phase power supply equipment to obtain the fault detection result, and generating a first prompt message when the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, this solves the problem of low phase loss detection efficiency in current three-phase four-wire power supply equipment. It realizes a method for quickly detecting phase loss problems in three-phase four-wire power supply equipment and issuing an alarm, thereby improving the phase loss detection efficiency.

[0141] Based on the foregoing embodiments, embodiments of this application provide a fault detection device. The fault detection device is connected to the first live wire and neutral wire of a three-phase power supply equipment to obtain operating power. (Refer to...) Figure 13 As shown, the fault detection device 3 may include: a detection unit 31, a determination unit 32, and a generation unit 33; wherein:

[0142] The detection unit 31 is used to detect the first target voltage and the second target voltage of the three-phase power supply equipment; wherein neither the first target voltage nor the second target voltage includes the phase voltage corresponding to the first live wire;

[0143] The determining unit 32 is used to determine the fault detection result based on the first target voltage and the second target voltage; wherein the fault detection result is used to indicate whether the three-phase power supply equipment has a live wire phase loss fault;

[0144] The generation unit 33 is used to generate a first prompt message if the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment; wherein, the first prompt message is used to indicate that there is a live wire phase loss fault in the three-phase power supply equipment.

[0145] In other embodiments of this application, the determining unit includes: a first determining module and a second determining module; wherein:

[0146] The first determining module is used to determine a first effective value of the first target voltage and a second effective value of the second target voltage;

[0147] The second determining module is used to determine the fault detection result based on the first effective value and the second effective value.

[0148] In other embodiments of this application, the second determining module is specifically used to implement the following steps:

[0149] If both the first target voltage and the second target voltage are line voltages, determine the first minimum effective value and the maximum effective value from the first effective value and the second effective value;

[0150] If the first minimum effective value is less than the first voltage threshold, the fault detection result is determined to be a phase loss fault in the three-phase power supply equipment; wherein, the first voltage threshold is greater than 0 and less than 0. The phase voltage vector amplitude is times that of the phase voltage vector.

[0151] In other embodiments of this application, after determining the fault detection result based on the first target voltage and the second target voltage, the unit execution step is further configured to perform the following steps:

[0152] If the common live wire for the first target voltage and the second target voltage is a live wire other than the first live wire, and the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, and the maximum effective value is greater than or equal to the first voltage threshold, then it is determined that there is a live wire phase loss other than the first live wire and the common live wire.

[0153] Generate a second prompt message to indicate a phase loss of live wires other than the first live wire and the common live wire;

[0154] If the common live wire of the first target voltage and the second target voltage is the first live wire, and the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, and the maximum effective value is greater than or equal to the first voltage threshold, determine the live wire phase loss other than the first live wire corresponding to the minimum effective value.

[0155] Generate a third prompt message to indicate a phase loss on the third live wire;

[0156] If the common live wire for the first target voltage and the second target voltage is the first live wire, and the fault detection result indicates that there is a phase loss fault in the three-phase power supply equipment, and the maximum effective value is less than the first voltage threshold, it is determined that all live wires in the three-phase power supply equipment except the first live wire are phase loss.

[0157] Generate a fourth prompt message to indicate that all live wires except the first live wire in the three-phase power supply equipment are missing a phase.

[0158] In other embodiments of this application, the second determining module is further specifically used to implement the following steps:

[0159] If both the first target voltage and the second target voltage are phase voltages, a second minimum effective value is determined from the first effective value and the second effective value; wherein, the first target voltage and the second target voltage are independent of the first live wire;

[0160] If the second minimum effective value is less than the second voltage threshold, the fault detection result is determined to be a phase loss fault in the three-phase power supply equipment; wherein, the second voltage threshold is greater than 0 and less than or equal to the phase voltage vector amplitude.

[0161] In other embodiments of this application, after determining the fault detection result based on the first target voltage and the second target voltage, the determining unit is further configured to perform the following steps:

[0162] If the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, and the first effective value is less than the second voltage threshold, the live wire phase loss corresponding to the first target voltage is determined.

[0163] Generate a fifth prompt message to indicate the missing live wire phase corresponding to the first target voltage;

[0164] If the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, and the second effective value is less than the second voltage threshold, the live wire phase loss corresponding to the second target voltage is determined.

[0165] A sixth notification message is generated to indicate a phase loss on the live wire corresponding to the second target voltage.

[0166] In other embodiments of this application, the second determining module is further specifically used to implement the following steps:

[0167] When the first target voltage is a phase voltage and the second target voltage is a line voltage, and the first and second target voltages share the second live wire, if the first effective value is less than the third voltage threshold, or the second effective value is less than the fourth voltage threshold, the fault detection result is determined to be a phase loss fault in the three-phase power supply equipment; wherein, the third voltage threshold is greater than 0 and less than the phase voltage vector amplitude, and the fourth voltage threshold is greater than 0 and less than... The phase voltage vector amplitude is times that of the first live wire, and the second live wire is not the same live wire as the first live wire.

[0168] In other embodiments of this application, after determining the fault detection result based on the first target voltage and the second target voltage, the determining unit is further configured to perform the following steps:

[0169] If the fault detection result indicates that there is a phase loss fault in the three-phase power supply equipment, and the first effective value is greater than or equal to the third voltage threshold, and the second effective value is less than the fourth voltage threshold, the third live wire is determined to be missing; wherein, the third live wire is the live wire in the three-phase power supply equipment other than the first live wire and the second live wire.

[0170] Generate a seventh alert message to indicate a phase loss on the third live wire.

[0171] In other embodiments of this application, the second determining module is further specifically used to perform the following steps:

[0172] If the first target voltage is a phase voltage and the second target voltage is a line voltage, and the live wire corresponding to the second target voltage is different from the live wire corresponding to the first target voltage, then if the first effective value is less than the fifth voltage threshold, or the second effective value is less than the sixth voltage threshold, the fault detection result is determined to be a phase loss fault in the three-phase power supply equipment; wherein, the fifth voltage threshold is greater than 0 and less than the phase voltage vector amplitude, and the sixth voltage threshold is greater than 0 and less than... The phase voltage vector amplitude is times that of the phase voltage vector.

[0173] In other embodiments of this application, after determining the fault detection result based on the first target voltage and the second target voltage, the determining unit is further configured to perform the following steps:

[0174] If the fault detection result indicates that there is a live wire phase loss fault in the three-phase power supply equipment, and the first effective value is less than the fifth voltage threshold, the live wire phase loss corresponding to the first target voltage is determined.

[0175] Generate an eighth prompt message to indicate a missing live wire phase corresponding to the first target voltage;

[0176] If the fault detection result indicates that there is a phase loss fault in the three-phase power supply equipment, and the second effective value is less than the sixth voltage threshold, the fourth phase loss of the live wire corresponding to the second target voltage is determined; wherein, the fourth live wire is the live wire in the three-phase power supply equipment other than the first live wire and the live wire corresponding to the first target voltage;

[0177] Generate a ninth alert message to indicate a phase loss on the fourth live wire.

[0178] It should be noted that the specific implementation process of information interaction between units and modules in this embodiment can be referred to Figures 1-6 The implementation process of the fault detection method provided in the corresponding embodiment will not be described in detail here.

[0179] In this embodiment, after detecting the first target voltage and the second target voltage of the three-phase power supply equipment, a fault detection result is determined based on the first target voltage and the second target voltage. If the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, a first prompt message is generated. Thus, by analyzing the two target voltages of the three-phase power supply equipment to obtain the fault detection result, and generating a first prompt message when the fault detection result indicates that the three-phase power supply equipment has a live wire phase loss fault, this solves the problem of low phase loss detection efficiency in current three-phase four-wire power supply equipment. It realizes a method for quickly detecting phase loss problems in three-phase four-wire power supply equipment and issuing an alarm, thereby improving the phase loss detection efficiency.

[0180] Based on the foregoing embodiments, embodiments of this application provide a fault detection device. The fault detection device is connected to the first live wire and neutral wire of a three-phase power supply to obtain operating power. (Refer to...) Figure 14 As shown, the fault detection device 4 may include: a detection circuit 41 and a processor 42; wherein:

[0181] The detection circuit 41 is used 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, neither the first target voltage nor the second target voltage includes the phase voltage corresponding to the first live wire;

[0182] The processor 42 is configured to receive a first target voltage and a second target voltage, and determine a fault detection result based on the first target voltage and the second target voltage; wherein the fault detection result is used to indicate whether a live wire phase loss fault has occurred in the three-phase power supply equipment; if the fault detection result indicates that a live wire phase loss fault has occurred in the three-phase power supply equipment, a first prompt message is generated; wherein the first prompt message is used to indicate that a live wire phase loss fault has occurred in the three-phase power supply equipment.

[0183] In other embodiments of this application, the specific implementation process of processor 42 can be referred to Figures 1-6 The implementation process of the method shown will not be described in detail here. It should be noted that when the fault detection equipment includes a voltage detection device, the detection circuit 41 is the aforementioned voltage detection circuit.

[0184] Based on the foregoing embodiments, embodiments of this application provide a three-phase power supply system, referring to... Figure 15 As shown, the three-phase power supply system 5 may include: a three-phase power supply device 51 for providing three-phase power and a device for implementing... Figures 1-6 The fault detection method includes a fault detection device 52; wherein the specific implementation process of the fault detection device 52 can be referred to Figures 1-6 The implementation process of the method shown will not be described in detail here. Furthermore, the three-phase power supply device 51 here is the same as the aforementioned three-phase power supply device E, and the fault detection device 52 is the same as the aforementioned fault detection device G.

[0185] Based on the foregoing embodiments, embodiments of this application provide a computer-readable storage medium, simply referred to as a storage medium, which stores one or more programs that can be executed by one or more processors to achieve, as follows: Figures 1-6 The implementation process of the fault detection method provided in the corresponding embodiment will not be described in detail here.

[0186] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware aspects. Furthermore, this 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) containing computer-usable program code.

[0187] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations 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, 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, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0188] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0189] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0190] The above are merely preferred embodiments of this application and are not intended to limit the scope of protection of this application.

Claims

1. A fault detection method characterized by, The method is applied to a fault detection device, the fault detection device obtains working power by connecting with a first fire line and a zero line of a three-phase power supply device, 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 do not include phase voltage corresponding to the first fire line; determining a fault detection result based on the first target voltage and the second target voltage; wherein the fault detection result is used to indicate whether the three-phase power supply device has a fire line open-phase fault; if the fault detection result indicates that the three-phase power supply device has a fire line open-phase fault, generating a first prompt information; wherein the first prompt information is used to prompt that the three-phase power supply device has a fire line open-phase fault; wherein the determining of the fault detection result based on the first target voltage and the second target voltage comprises: determining a first effective value of the first target voltage and a second effective value of the second target voltage; determining the fault detection result based on the first effective value and the second effective value; wherein after the determining of the fault detection result based on the first effective value and the second effective value, comprising: if the first target voltage and the second target voltage are line voltages, determining a first minimum effective value and a maximum effective value from the first effective value and the second effective value; in the case that the common fire line of the first target voltage and the second target voltage is a fire line other than the first fire line, if the fault detection result indicates that the three-phase power supply device has a fire line open-phase fault, and the maximum effective value is greater than or equal to a first voltage threshold, determining that a fire line other than the first fire line and the common fire line is open-phase; generating a second prompt information used to indicate that the fire line other than the first fire line and the common fire line is open-phase; or, if the first target voltage and the second target voltage are phase voltages, determining a second minimum effective value from the first effective value and the second effective value; if the fault detection result indicates that the three-phase power supply device has a fire line open-phase fault, and the first effective value is less than a second voltage threshold, determining that the fire line corresponding to the first target voltage is open-phase; generating a fifth prompt information used to indicate that the fire line corresponding to the first target voltage is open-phase; or, in the case that the first target voltage is a phase voltage and the second target voltage is a line voltage, and the first target voltage and the second target voltage share a second fire line, if the fault detection result indicates that the three-phase power supply device has a fire line open-phase fault, and the first effective value is greater than or equal to a third voltage threshold, and the second effective value is less than a fourth voltage threshold, determining that a third fire line is open-phase; wherein the third fire line is a fire line other than the first fire line and the second fire line in the three-phase power supply device; generating a seventh prompt information used to indicate that the third fire line is open-phase; or, ​ In a case where the first target voltage is a phase voltage and the second target voltage is a line voltage, and a fire line corresponding to the second target voltage is different from a fire line corresponding to the first target voltage, if the fault detection result indicates that the three-phase power supply device has a fire line open-phase fault, and the first effective value is less than a fifth voltage threshold, it is determined that the fire line corresponding to the first target voltage is open-phase; and eighth prompt information indicating that the fire line corresponding to the first target voltage is open-phase is generated.

2. The method of claim 1, wherein, The determining the fault detection result based on the first effective value and the second effective value comprises: If the first minimum effective value is less than a first voltage threshold, it is determined that the fault 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.

3. The method of claim 2, wherein, After the determining the fault detection result based on the first target voltage and the second target voltage, the method further comprises: In a case where the common fire line of the first target voltage and the second target voltage is the first fire line, if the fault detection result indicates that the three-phase power supply device has a fire line open-phase fault, and the maximum effective value is greater than or equal to the first voltage threshold, it is determined that the fire line corresponding to the minimum effective value, except the first fire line, is open-phase; third prompt information indicating that the fire line corresponding to the first minimum effective value, except the first fire line, is open-phase is generated; In a case where the common fire line of the first target voltage and the second target voltage is the first fire line, if the fault detection result indicates that the three-phase power supply device has a fire line open-phase fault, and the maximum effective value is less than the first voltage threshold, it is determined that all the fire lines, except the first fire line, in the three-phase power supply device are open-phase; fourth prompt information indicating that all the fire lines, except the first fire line, in the three-phase power supply device are open-phase is generated.

4. The method of claim 1, wherein, The determining the fault detection result based on the first effective value and the second effective value comprises: If the second minimum effective value is less than a second voltage threshold, it is determined that the fault detection result is that the three-phase power supply device has a fire line open-phase fault; wherein the second voltage threshold is greater than 0 and less than or equal to a phase voltage vector amplitude.

5. The method of claim 4, wherein, After the determining the fault detection result based on the first target voltage and the second target voltage, the method further comprises: If the fault detection result indicates that the three-phase power supply device has a fire line open-phase fault, and the second effective value is less than the second voltage threshold, it is determined that the fire line corresponding to the second target voltage is open-phase; sixth prompt information indicating that the fire line corresponding to the second target voltage is open-phase is generated.

6. The method of claim 1, wherein, The determining the fault detection result based on the first effective value and the second effective value comprises: In a case where the first target voltage is a phase voltage and the second target voltage is a line voltage, and the first target voltage and the second target voltage share a second fire wire, if the first effective value is less than a third voltage threshold, or the second effective value is less than a fourth voltage threshold, it is determined that the fault detection result is that the three-phase power supply equipment has a fire wire open-phase fault; wherein the third voltage threshold is greater than 0 and less than a phase voltage vector amplitude, and the fourth voltage threshold is greater than 0 and less than times the phase voltage vector amplitude, and the second fire wire is not the same fire wire as the first fire wire.

7. The method of claim 1, wherein, The determining the fault detection result based on the first effective value and the second effective value comprises: In a case where the first target voltage is a phase voltage and the second target voltage is a line voltage, and the second target voltage corresponds to a fire line different from a fire line corresponding to the first target voltage, if the first effective value is less than a fifth voltage threshold, or the second effective value is less than a sixth voltage threshold, it is determined that the fault detection result is that the three-phase power supply equipment has a fire line open-phase fault; wherein the fifth voltage threshold is greater than 0 and less than a phase voltage vector amplitude, and the sixth voltage threshold is greater than 0 and less than times the phase voltage vector amplitude.

8. The method of claim 7, wherein, After the determining the fault detection result based on the first target voltage and the second target voltage, the method further comprises: If the fault detection result indicates that the three-phase power supply device has a fire line open-phase fault, and the second effective value is less than the sixth voltage threshold, it is determined that the fourth fire line corresponding to the second target voltage is open-phase; wherein the fourth fire line is a fire line, except the first fire line and the fire line corresponding to the first target voltage, in the three-phase power supply device; generate a ninth prompt information for indicating the fourth fire line open-phase.

9. A fault detection apparatus characterized by comprising: The fault detection device is connected with a first fire line and a zero line of a three-phase power supply equipment to obtain working power supply, and the device comprises a detection unit, a determination unit and a generation 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, neither the first target voltage nor the second target voltage includes a phase voltage corresponding to the first fire line; The determination unit is configured to determine a fault detection result based on the first target voltage and the second target voltage; wherein, the fault detection result is used to indicate whether the three-phase power supply equipment has a fire line open-phase fault; The generation unit is configured to generate a first prompt information if the fault detection result indicates that the three-phase power supply equipment has a fire line open-phase fault; wherein, the first prompt information is used to prompt that the three-phase power supply equipment has a fire line open-phase fault The determination unit is configured to determine a first effective value of the first target voltage and a second effective value of the second target voltage; and determine the fault detection result based on the first effective value and the second effective value; After the determination unit determines the fault detection result based on the first effective value and the second effective value, the determination unit is further configured to: If the first target voltage and the second target voltage are both line voltages, determine a first minimum effective value and a maximum effective value from the first effective value and the second effective value; in the case that a common fire line of the first target voltage and the second target voltage is a fire line other than the first fire line, if the fault detection result indicates that the three-phase power supply equipment has a fire line open-phase fault, and the maximum effective value is greater than or equal to a first voltage threshold, determine that a fire line other than the first fire line and the common fire line is open-phase; generate a second prompt information for indicating the fire line open-phase of the fire line other than the first fire line and the common fire line; or, If the first target voltage and the second target voltage are both phase voltages, determine a second minimum effective value from the first effective value and the second effective value; if the fault detection result indicates that the three-phase power supply equipment has a fire line open-phase fault, and the first effective value is less than a second voltage threshold, determine that a fire line corresponding to the first target voltage is open-phase; generate a fifth prompt information for indicating the fire line open-phase of the first target voltage; or; In the case that the first target voltage is a phase voltage and the second target voltage is a line voltage, and the first target voltage and the second target voltage share a second fire line, if the fault detection result indicates that the three-phase power supply equipment has a fire line open-phase fault, and the first effective value is greater than or equal to a third voltage threshold, and the second effective value is less than a fourth voltage threshold, determine that a third fire line is open-phase; wherein, the third fire line is a fire line other than the first fire line and the second fire line in the three-phase power supply equipment; generate a seventh prompt information for indicating the third fire line open-phase; or In a case where the first target voltage is a phase voltage and the second target voltage is a line voltage, and the second target voltage corresponds to a fire line different from the fire line corresponding to the first target voltage, if the fault detection result indicates that the three-phase power supply equipment has a fire line open-phase fault, and the first effective value is less than a fifth voltage threshold, it is determined that the fire line corresponding to the first target voltage is open-phase; eighth prompt information for indicating that the fire line corresponding to the first target voltage is open-phase is generated.

10. A fault detection device, characterized by The fault detection device is connected with a first fire line and a zero line of a three-phase power supply equipment to obtain working power supply, and the device comprises a detection circuit and a processor; wherein: The detection circuit is used for detecting a first target voltage and a second target voltage of the three-phase power supply equipment, and sending the first target voltage and the second target voltage to the processor; wherein, the first target voltage and the second target voltage do not include a phase voltage corresponding to the first fire line; The processor is configured to receive the first target voltage and the second target voltage, determine a fault detection result based on the first target voltage and the second target voltage, wherein the fault detection result is used to indicate whether the three-phase power supply equipment has a fire line open-phase fault, and generate first prompt information if the fault detection result indicates that the three-phase power supply equipment has a fire line open-phase fault, wherein the first prompt information is used to prompt that the three-phase power supply equipment has a fire line open-phase fault. The determination of the fault detection result based on the first target voltage and the second target voltage comprises: determining a first effective value of the first target voltage and a second effective value of the second target voltage, and determining the fault detection result based on the first effective value and the second effective value. After the determination of the fault detection result based on the first effective value and the second effective value, the following operations are performed: if the first target voltage and the second target voltage are both line voltages, a first minimum effective value and a maximum effective value are determined from the first effective value and the second effective value; in the case that the common fire line of the first target voltage and the second target voltage is a fire line other than the first fire line, if the fault detection result indicates that the three-phase power supply equipment has a fire line open-phase fault and the maximum effective value is greater than or equal to a first voltage threshold, it is determined that a fire line other than the first fire line and the common fire line is open-phase; second prompt information indicating that the fire line other than the first fire line and the common fire line is open-phase is generated; or, if the first target voltage and the second target voltage are both phase voltages, a second minimum effective value is determined from the first effective value and the second effective value; if the fault detection result indicates that the three-phase power supply equipment has a fire line open-phase fault and the first effective value is less than a second voltage threshold, it is determined that the fire line corresponding to the first target voltage is open-phase; fifth prompt information indicating that the fire line corresponding to the first target voltage is open-phase is generated; or, in the case that the first target voltage is a phase voltage and the second target voltage is a line voltage, and the first target voltage and the second target voltage share a second fire line, if the fault detection result indicates that the three-phase power supply equipment has a fire line open-phase fault, the first effective value is greater than or equal to a third voltage threshold, and the second effective value is less than a fourth voltage threshold, it is determined that a third fire line is open-phase; the third fire line is a fire line other than the first fire line and the second fire line in the three-phase power supply equipment; seventh prompt information indicating that the third fire line is open-phase is generated; or, in the case that the first target voltage is a phase voltage and the second target voltage is a line voltage, and the fire line corresponding to the second target voltage is different from the fire line corresponding to the first target voltage, if the fault detection result indicates that the three-phase power supply equipment has a fire line open-phase fault and the first effective value is less than a fifth voltage threshold, it is determined that the fire line corresponding to the first target voltage is open-phase; eighth prompt information indicating that the fire line corresponding to the first target voltage is open-phase is generated.

11. 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 10.

12. 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 8.

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