CN115407231A - Fault detection method, device, equipment, system and storage medium - Google Patents

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

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Publication number
CN115407231A
CN115407231A CN202110579833.8A CN202110579833A CN115407231A CN 115407231 A CN115407231 A CN 115407231A CN 202110579833 A CN202110579833 A CN 202110579833A CN 115407231 A CN115407231 A CN 115407231A
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phase
live wire
voltage
target voltage
power supply
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Inventor
黄招彬
龙谭
赵鸣
文先仕
韦东
张杰楠
徐锦清
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GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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Priority to CN202110579833.8A priority Critical patent/CN115407231A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • G01R31/42—AC power supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/16—Measuring asymmetry of polyphase networks

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

The embodiment of the application discloses a fault detection method, which comprises the following steps: detecting a first target voltage and a second target voltage of the three-phase power supply equipment; the first target voltage and the second target voltage do not comprise phase voltage corresponding to a first live wire; determining a fault detection result based on the first target voltage and the second target voltage; the fault detection result is used for indicating whether the three-phase power supply equipment has a live wire phase loss fault or not; if the fault detection result indicates that the live wire open-phase fault exists in the three-phase power supply equipment, generating first prompt information; and the first prompt information is used for prompting that the three-phase power supply equipment has a live wire open-phase fault. The embodiment of the application also discloses a fault detection device, equipment, a system and a storage medium.

Description

Fault detection method, device, equipment, system and storage medium
Technical Field
The present application relates to the field of power detection technologies, and in particular, to a method, an apparatus, a device, a system, and a storage medium for fault detection.
Background
In an application system powered by a three-phase Power supply, such as an inverter air conditioning system, a three-phase Power supply circuit adopted generally includes a three-phase passive Power Factor Correction (PFC) scheme circuit, a three-phase active PFC two-level scheme circuit, and a three-phase active PFC three-level scheme circuit topology. The main circuit of the three-phase power supply circuit can be used for driving the variable frequency compressor, and can also be used for leading out a phase from the three-phase power supply circuit to independently rectify the phase to supply power to the auxiliary power supply, and further can supply power to the direct current fan driving circuit. At present, because auxiliary power source usually with realize that the microcontroller that the information was reported an emergency and asked for help or increased vigilance supplies power, like this, when the live wire that supplies power for auxiliary power source lacks the looks, auxiliary power source is out of work, then microcontroller also can not work, like this, discovers the problem that lacks the looks for the live wire of auxiliary power source power supply relatively easily.
However, if the other two live wires except the live wire supplying power to the auxiliary power supply in the three-phase power supply circuit have a phase loss, the auxiliary power supply is not affected, and a method for quickly detecting whether the other two live wires have a phase loss is not provided at present, so that the phase loss detection efficiency is low.
Content of application
In order to solve the above technical problems, embodiments of the present application desirably provide a fault detection method, apparatus, device, system, and storage medium, so as to solve the problem of low phase loss detection efficiency in the current three-phase four-wire system power supply device (referred to as a three-phase power supply device for short), implement a method for quickly detecting the phase loss problem in the three-phase four-wire system power supply device and performing an alarm, and improve the phase loss detection efficiency.
The technical scheme of the application is realized as follows:
in a first aspect, a fault detection method is applied to a fault detection device, where the fault detection device is connected to a first live line and a first neutral line of a three-phase power supply device to obtain a working power supply, and the method includes:
detecting 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 comprises a phase voltage corresponding to a first hot wire;
determining a fault detection result based on the first target voltage and the second target voltage; the fault detection result is used for indicating whether the three-phase power supply equipment has a live wire phase loss fault or not;
if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment, generating first prompt information; and the first prompt information is used for prompting that the three-phase power supply equipment has a live wire open-phase fault.
In a second aspect, a fault detection device is connected to a first live wire and a zero wire of a three-phase power supply device to obtain a working power supply, the device includes: the device comprises a detection unit, a determination unit and a generation unit; wherein:
the detection unit is used for detecting 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 comprises a phase voltage corresponding to a first hot wire;
the determination unit is used for determining a fault detection result based on the first target voltage and the second target voltage; the fault detection result is used for indicating whether the phase-lack fault of the live wire occurs in the three-phase power supply equipment;
the generating unit is used for generating first prompt information if the fault detection result indicates that the three-phase power supply equipment has a live wire phase-loss fault; and the first prompt information is used for prompting that the three-phase power supply equipment has a live wire open-phase fault.
In a third aspect, a fault detection device is connected to a first live line and a neutral line of a three-phase power supply device to obtain a working power supply, the device comprising: 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 neither the first target voltage nor the second target voltage comprises a phase voltage corresponding to a first hot wire;
the processor is used for receiving the first target voltage and the second target voltage, and determining a fault detection result based on the first target voltage and the second target voltage; the fault detection result is used for indicating whether the three-phase power supply equipment has a live wire phase loss fault or not; if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment, generating first prompt information; and the first prompt information is used for prompting that the three-phase power supply equipment has a live wire open-phase fault.
In a fourth aspect, a three-phase power supply system includes: a three-phase power supply apparatus for supplying three-phase power and a fault detection apparatus as described above.
In a fifth aspect, a storage medium has stored thereon a fault detection program which, when executed by a processor, implements the steps of the fault detection method as defined in any one of the above.
In the embodiment of the application, after the first target voltage and the second target voltage of the three-phase power supply equipment are detected, a fault detection result is determined based on the first target voltage and the second target voltage, and if the fault detection result indicates that the three-phase power supply equipment has a live wire phase-loss fault, first prompt information is generated. Therefore, the fault detection result is obtained by analyzing the two target voltages of the three-phase power supply equipment, and the first prompt information is generated when the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault, so that the problem of low open-phase detection efficiency in the existing three-phase four-wire system power supply equipment is solved, the method for rapidly detecting the open-phase problem in the three-phase four-wire system power supply equipment and giving an alarm is realized, and the open-phase detection efficiency is improved.
Drawings
Fig. 1 is a first schematic flow chart of a fault detection method according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a second fault detection method according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart illustrating a third method for detecting a fault according to an embodiment of the present disclosure;
fig. 4 is a fourth schematic flowchart of a fault detection method according to an embodiment of the present application;
fig. 5 is a schematic flowchart of a fault detection method according to an embodiment of the present application;
fig. 6 is a schematic flowchart sixth of a fault detection method provided in the embodiment of the present application;
fig. 7a is a circuit topology diagram of a three-phase passive PFC device according to an embodiment of the present disclosure;
fig. 7b is a circuit topology diagram of a three-phase active PFC two-level device according to an embodiment of the present application;
fig. 7c is a circuit topology diagram of a three-phase active PFC three-level device according to an embodiment of the present application;
fig. 8 is a schematic connection diagram between a three-phase power supply device, a voltage detection apparatus and a fault detection device according to an embodiment of the present disclosure;
fig. 9 is a schematic connection diagram of another three-phase power supply device, a voltage detection apparatus and a fault detection device according to an embodiment of the present application;
FIG. 10 is a three-phase voltage vector diagram provided by an embodiment of the present application;
fig. 11a is a schematic view of a first application scenario provided in an embodiment of the present application;
fig. 11b is a schematic view of an application scenario provided in the embodiment of the present application;
fig. 11c is a schematic view of an application scenario iii provided in the embodiment of the present application;
fig. 11d is a schematic view of an application scenario four provided in the embodiment of the present application;
fig. 12 is a schematic circuit design diagram of a voltage detection circuit according to an embodiment of the present disclosure;
fig. 13 is a schematic structural diagram of a fault detection apparatus according to an embodiment of the present application;
fig. 14 is a schematic structural diagram of a fault detection device according to an embodiment of the present application;
fig. 15 is a schematic structural diagram of a three-phase power supply system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
An embodiment of the present application provides a fault detection method, as shown in fig. 1, where the method is applied to a fault detection device, and the fault detection device is connected to a first live line and a first zero line of a three-phase power supply device to obtain a working power supply, and the method includes the following steps:
step 101, detecting a first target voltage and a second target voltage of a three-phase power supply device.
And the first target voltage and the second target voltage do not comprise phase voltage corresponding to the first live wire.
In the embodiment of the present application, the three-phase power supply device may be a three-phase four-wire system power supply device for providing three-phase power, that is, the three-phase power supply device includes three live wires and one neutral wire. Because the phase voltage corresponding to the first live wire provides a working power supply for the fault detection equipment, whether the first live wire is in a phase failure state or not can be determined by determining whether the fault detection equipment works or not, and therefore the condition of the phase voltage corresponding to the first live wire does not need to be considered when whether the three-phase power supply equipment is in a phase failure state or not is analyzed. The first target voltage and the second target voltage of the three-phase power supply apparatus may be detected by the voltage detection device. The voltage detection device can be a part of the fault detection equipment or an independent device, and under any condition, the fault detection equipment can manage and control the voltage detection device.
Step 102, determining a fault detection result based on the first target voltage and the second target voltage.
And the fault detection result is used for indicating whether the phase-lack fault of the live wire occurs in the three-phase power supply equipment.
In the embodiment of the application, the first target voltage and the second target voltage are analyzed to determine whether the two live wires except the first live wire in the three-phase power supply equipment have the condition of phase loss.
And 103, if the fault detection result indicates that the live wire open-phase fault exists in the three-phase power supply equipment, generating first prompt information.
The first prompt information is used for prompting that the three-phase power supply equipment has a live wire phase-loss fault.
In the embodiment of the application, if the fault detection result indicates that the three-phase power supply equipment does not have the phase failure condition, the three-phase power supply equipment is controlled to normally provide a working power supply for the user electric equipment. If the fault detection result indicates that the three-phase power supply equipment has the phase failure condition, controlling the three-phase power supply equipment to temporarily not provide a working power supply for the user electric equipment, generating first prompt information for indicating that the three-phase power supply equipment has the phase failure, wherein the generated first prompt information can be displayed in a display area corresponding to the fault detection equipment, or sending the generated first prompt information to display equipment with communication link with the fault detection equipment, for example, computer equipment or intelligent mobile terminal equipment of a manager for monitoring the three-phase power supply equipment, such as a mobile phone and the like.
In the embodiment of the application, after the first target voltage and the second target voltage of the three-phase power supply equipment are detected, a fault detection result is determined based on the first target voltage and the second target voltage, and if the fault detection result indicates that the three-phase power supply equipment has a live wire phase-loss fault, first prompt information is generated. Therefore, the fault detection result is obtained by analyzing the two target voltages of the three-phase power supply equipment, and the first prompt information is generated when the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault, so that the problem of low open-phase detection efficiency in the existing three-phase four-wire system power supply equipment is solved, the method for rapidly detecting the open-phase problem in the three-phase four-wire system power supply equipment and giving an alarm is realized, and the open-phase detection efficiency is improved.
Based on the foregoing embodiments, an embodiment of the present application provides a fault detection method, as shown in fig. 2, where the method is applied to a fault detection device, and the fault detection device is connected to a first live line and a first neutral line of a three-phase power supply device to obtain a working power supply, where the method includes the following steps:
step 201, detecting a first target voltage and a second target voltage of a three-phase power supply device.
And the first target voltage and the second target voltage do not comprise phase voltage corresponding to the first live wire.
In this embodiment of the application, the voltage detection device may be fixedly connected to a voltage target end in the three-phase power supply device, or a user may select to access the voltage target end in the three-phase power supply device according to a requirement of the user, and two voltages of the three-phase power supply device, except for two phase voltages corresponding to the first live wire, are detected by the voltage detection device to obtain the first target voltage and the second target voltage.
It should be noted that, in some application scenarios, if the cost is not considered, at least two voltage detection devices may be disposed on the three-phase four-wire of the three-phase power supply device, and two of the voltage detection devices are selected according to the requirement to detect and obtain the first target voltage and the second target voltage.
Step 202, determining a first effective value of the first target voltage and a second effective value of the second target voltage.
In the embodiment of the present application, when the thermal effect of the alternating current is equal to that of the direct current of a certain voltage, the voltage of the direct current can be regarded as the effective value of the voltage of the alternating current. The effective value of the corresponding voltage can be represented by the formula
Figure BDA0003085747180000061
Where u (T) is a first target voltage signal or a second target voltage signal, T is a voltage variation period, and ^ is an integral operation sign. In an ideal situation, the voltage signal of the three-phase power supply device target is taken as a sinusoidal voltage signal for example, and the corresponding effective voltage value may be calculated by dividing the voltage peak value of the sinusoidal voltage signal by root 2.
And step 203, determining a fault detection result based on the first effective value and the second effective value.
In the embodiment of the present application, the first effective value and the second effective value are analyzed to determine the fault detection result.
And step 204, if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment, generating first prompt information.
The first prompt information is used for prompting that the three-phase power supply equipment has a live wire phase-loss fault.
In the embodiment of the application, when the fault detection result indicates that the three-phase power supply equipment has the phase failure, first prompt information is generated and displayed. The fault detection device generates first prompt information and then sends the first prompt information to terminal equipment such as a smart phone of a user, wherein the terminal equipment is in communication connection with the fault detection device, so that the user can know that the current phase-lack fault exists in the three-phase power supply device.
Based on the foregoing embodiments, in other embodiments of the present application, step 203 may be implemented by steps 203a to 203 b:
step 203a, if the first target voltage and the second target voltage are both 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 embodiment of the present application, if the first effective value is smaller than the second effective value, the first minimum effective value is the first effective value; and if the second effective value is smaller than the first effective value, the first minimum effective value is the second effective value. If the first valid value is equal to the second valid value, the first minimum valid value may be the first valid value, and the maximum valid value may also be the first valid value.
And 203b, if the first minimum effective value is smaller than the first voltage threshold, determining that the fault detection result indicates that the live wire phase-lack fault exists in the three-phase power supply equipment.
Wherein the first voltage threshold is greater than 0 and less than
Figure BDA0003085747180000072
Multiple phase voltage vector magnitude.
In the embodiment of the present application, the first voltage threshold is an empirical value obtained through a large number of experiments, and the value range of the first voltage threshold is
Figure BDA0003085747180000071
Wherein Vm is a signal amplitude of a target voltage signal of the three-phase power supply equipment. Further, the value range of the first voltage threshold may be (5v, 270v).
Namely, when the first target voltage and the second target voltage are both line voltages, if a voltage smaller than a first voltage threshold exists in the first target voltage and the second target voltage, it is determined that the fault detection result indicates that the live line open-phase fault exists in the three-phase power supply equipment.
Based on the foregoing embodiment, in another embodiment of the present application, when step 203 is implemented by executing steps 203a to 203b, referring to fig. 3, after the fault detection apparatus executes step 203, it is further configured to select to execute steps 205 to 206 or steps 207 to 210. When the common live wire of the first target voltage and the second target voltage is a live wire except the first live wire, selectively executing the steps 205 to 206; if the common hot wire of the first target voltage and the second target voltage is the first hot wire, the steps 207 to 210 are selected to be executed:
and step 205, under the condition that the common live wire of the first target voltage and the second target voltage is the live wire except the first live wire, if the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault and the maximum effective value is greater than or equal to the first voltage threshold, determining that the live wires except the first live wire and the common live wire are open-phase.
In the embodiment of the present application, when the first minimum effective value is the first effective value, the maximum effective value is the second effective value; when the first minimum effective value is the second effective value, the maximum effective value is the first effective value.
Illustratively, if the first live line is the B live line in the three-phase power supply equipment, the maximum effective value is determined to be the voltage value between the C live line and the B live line
Figure BDA0003085747180000081
The minimum effective value is the voltage value U between the A live wire and the B live wire AB If the first voltage threshold is Vm when =0, it can be determined that the phase of the active line a is open.
And step 206, generating second prompt information for indicating that the live wires except the first live wire and the shared live wire are out of phase.
And step 207, under the condition that the common live wire of the first target voltage and the second target voltage is the first live wire, if the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault and the maximum effective value is greater than or equal to the first voltage threshold value, determining the live wires except the first live wire open-phase corresponding to the minimum effective value.
And 208, generating third prompt information for indicating that the live wire except the first live wire corresponding to the first minimum effective value is open-phase.
Step 209, under the condition that the common live wire of the first target voltage and the second target voltage is the first live wire, if the fault detection result indicates that the three-phase power supply device has a live wire open-phase fault and the maximum effective value is smaller than the first voltage threshold, determining that all the live wires except the first live wire in the three-phase power supply device are open-phase.
In this embodiment of the present application, if it is detected that both the maximum effective value and the minimum effective value are smaller than the first voltage threshold, it may be determined that two remaining live wires, except the first live wire, in the three-phase power supply device are all in shortAnd (4) phase(s). For example, in the case that the first target voltage and the second target voltage have a common fire line of C fire line, a voltage value U between C fire line and A fire line is detected CA =0, the minimum effective value being the voltage value U between the C and B live wires CB When =0, it can be determined that both of the live lines a and B are out of phase.
And step 210, fourth prompt information used for indicating that all live wires except the first live wire in the three-phase power supply equipment are in a phase failure state is generated.
If the common hot line of the first target voltage and the second target voltage is the first hot line, steps 207 to 208 or steps 209 to 210 may be selectively executed according to circumstances.
It should be noted that step 206, step 208, or step 210 may be executed simultaneously with step 204, or step 206, step 208, or step 210 may be executed after step 207. And further, the fact that the user is specifically prompted which phase-lacking live wire is through the second prompt message or the third prompt message is achieved, so that the user can conveniently and quickly repair the prompted phase-lacking live wire.
Based on the foregoing embodiments, in other embodiments of the present application, step 203 may be implemented by steps 203c to 203 d:
and step 203c, 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.
Wherein the first target voltage and the second target voltage are independent of the first hot line.
In this embodiment of the application, the first target voltage may be a voltage between the second live wire and the neutral wire, and the corresponding second target voltage may be a voltage between the third live wire and the neutral wire; or the first target voltage may be a voltage between the third live and neutral wires and the second target voltage may be a voltage between the second live and neutral wires.
And 203d, if the second minimum effective value is smaller than the second voltage threshold, determining that the fault detection result is that the live wire phase-lack fault exists in the three-phase power supply equipment.
In the embodiment of the present application, the second voltage threshold may be an empirical value obtained through a large number of experiments, and the value range of the second voltage threshold is (0,vm). Further, the value range of the second voltage threshold is (5v, 150v).
Based on the foregoing embodiment, in another embodiment of the present application, when step 203 is implemented by steps 203c to 203d, referring to fig. 4, after the failure detection apparatus executes step 203d, it is further configured to execute steps 211 to 212 or steps 213 to 214. If the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault and the first effective value is smaller than the second voltage threshold, the steps 211 to 212 are selectively executed, and if the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault and the second effective value is smaller than the second voltage threshold, the steps 213 to 214 are selectively executed:
and step 211, if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment and the first effective value is smaller than the second voltage threshold, determining that the live wire phase-loss corresponding to the first target voltage exists.
In this embodiment of the application, when the first target voltage is a voltage between the second live wire and the zero line, if the fault detection result indicates that the three-phase power supply device has a live wire open-phase fault, and the first effective value is smaller than the second voltage threshold, it is determined that the second live wire is open-phase. And under the condition that the first target voltage is the voltage between the third live wire and the zero line, if the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault and the first effective value is smaller than the second voltage threshold, determining that the third live wire is open-phase.
And step 212, generating fifth prompt information for indicating that the live wire corresponding to the first target voltage is in a phase failure.
And 213, if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment and the second effective value is smaller than the second voltage threshold, determining that the live wire corresponding to the second target voltage is in phase-loss.
In this embodiment of the application, when the second target voltage is a voltage between the second live wire and the zero line, if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply device, and the second effective value is smaller than the second voltage threshold, it is determined that the second live wire phase-loss fault exists. And under the condition that the second target voltage is the voltage between the third live wire and the zero line, if the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault and the second effective value is smaller than the second voltage threshold, determining that the third live wire is open-phase.
And step 214, generating sixth prompt information for indicating that the live wire corresponding to the second target voltage is in a phase failure.
In the embodiment of the present application, step 212 or step 214 may be performed simultaneously with step 204, and step 212 or step 214 may also be performed after step 205.
Based on the foregoing embodiments, in other embodiments of the present application, step 203 may be implemented by step 203 e:
and 203e, under the condition 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 live line, if the first effective value is smaller than a third voltage threshold value or the second effective value is smaller than a fourth voltage threshold value, determining that a fault detection result indicates that a live line open-phase fault exists in the three-phase power supply equipment.
Wherein the third voltage threshold is greater than 0 and smaller than the phase voltage vector magnitude, and the fourth voltage threshold is greater than 0 and smaller than
Figure BDA0003085747180000101
The magnitude of the phase voltage vector is doubled, and the second line of sight is different from the first line of sight.
In the embodiment of the present application, the third voltage threshold is an empirical value obtained through a large number of experiments, and the fourth voltage threshold is an empirical value obtained through a large number of experiments, and in general, the value ranges of the third voltage threshold and the fourth voltage threshold are different. Wherein, the value range of the third voltage threshold is (0, vm); the value range of the fourth voltage threshold is
Figure BDA0003085747180000111
Furthermore, the value range of the third voltage threshold may be (5v, 150v), and the value range of the fourth voltage threshold may be (5v, 270v).
Based on the foregoing embodiment, referring to fig. 5, after the failure detection apparatus executes step 203e, the failure detection apparatus is further configured to execute steps 215 to 216:
step 215, if the fault detection result indicates that the phase-missing live wire fault exists in the three-phase power supply equipment, the first effective value is greater than or equal to a third voltage threshold, and the second effective value is smaller than a fourth voltage threshold, determining that the phase-missing live wire is in the third phase-missing live wire.
And the third live wire is a live wire except the first live wire and the second live wire in the three-phase power supply equipment.
And step 216, generating seventh prompt information for indicating that the third live wire is open of phase.
In some application scenarios, step 216 may be performed simultaneously by step 204.
Based on the foregoing embodiment, in other embodiments of the present application, step 203 may also be implemented by step 203 f:
and 203f, under the conditions that the first target voltage is a phase voltage, 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 smaller than a fifth voltage threshold value, or the second effective value is smaller than a sixth voltage threshold value, determining that the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment.
Wherein the fifth voltage threshold is greater than 0 and smaller than the phase voltage vector magnitude, and the sixth voltage threshold is greater than 0 and smaller than
Figure BDA0003085747180000112
Multiple phase voltage vector magnitude.
In this application embodiment, because first target voltage and second target voltage do not all include the looks voltage that first live wire corresponds, so first target voltage can be the looks voltage between second live wire and the zero line, correspondingly, because the live wire that the corresponding live wire of second target voltage and the looks voltage that first target voltage correspond are different, so the second target voltage can be the looks voltage between third live wire and first live wire, or first target voltage can be the looks voltage between third live wire and the zero line, the second target voltage that the corresponding looks voltage can be the looks voltage between second live wire and first live wire.
The fifth voltage threshold is an empirical value obtained through a large number of experiments, and the sixth voltage threshold is an empirical value obtained through a large number of experiments. Wherein, the value range of the fifth voltage threshold is (0, vm); the value range of the sixth voltage threshold is
Figure BDA0003085747180000121
Furthermore, the value range of the fifth voltage threshold may be (5v, 150v), and the value range of the sixth voltage threshold may be (5v, 270v).
Based on the foregoing embodiment, in another embodiment of the present application, as shown in fig. 6, after the failure detection apparatus performs step 203f, the failure detection apparatus is further configured to perform steps 217 to 218 or steps 219 to 220. If the fault detection result indicates that the live wire open-phase fault exists in the three-phase power supply equipment and the first effective value is smaller than the fifth voltage threshold, selectively executing the steps 217 to 218; and if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment and the second effective value is smaller than the sixth voltage threshold, selectively executing the steps 219 to 220.
And step 217, if the fault detection result indicates that the live wire open-phase fault exists in the three-phase power supply equipment and the first effective value is smaller than the fifth voltage threshold, determining that the live wire corresponding to the first target voltage is open-phase.
In an embodiment of the application, it is determined that the second live wire is open-phase when the first target voltage is a phase voltage between the second live wire and the neutral wire, or that the third live wire is open-phase when the first target voltage is a phase voltage between the third live wire and the neutral wire.
And step 218, generating eighth prompt information for indicating that the live wire corresponding to the first target voltage is in a phase failure.
Step 219, if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply device, and the second effective value is smaller than the sixth voltage threshold, determining that a fourth live wire phase-loss corresponding to the second target voltage exists.
And the fourth live wire is a live wire except for the first live wire corresponding to the first target voltage in the three-phase power supply equipment.
In the embodiment of the present application, when the second target voltage is a phase voltage between the second live wire and the neutral wire, it is determined that the second live wire is in a default phase, that is, the fourth live wire is the second live wire, or when the second target voltage is a phase voltage between the third live wire and the neutral wire, it is determined that the third live wire is in a default phase, that is, the third live wire is in a fourth live wire.
And step 220, generating ninth prompt information for indicating that the fourth live wire is in a phase failure.
For example, when the consumer electronic device is a variable frequency compressor, a circuit topology diagram of a three-phase passive PFC device including a main circuit driving the variable frequency compressor, an auxiliary circuit for separately rectifying power supplied to an auxiliary power supply and supplying power to a dc fan driving circuit may be shown in fig. 7 a; the circuit topology diagram of the three-phase active PFC two-level device which comprises a main circuit driving variable frequency compressor and is used for independently rectifying and supplying power to an auxiliary power supply and supplying power to a direct current fan driving circuit can be shown by referring to fig. 7 b; the circuit topology diagram of the three-phase active PFC three-level device which comprises a main circuit driving variable frequency compressor and an auxiliary circuit used for independently rectifying and supplying power to an auxiliary power supply and supplying power to a direct current fan driving circuit can be shown in a figure 7 c.
Referring to fig. 8 or 9, a connection manner among the three-phase power supply equipment E, the voltage detection device F, and the fault detection equipment G is shown, a power output end of the three-phase power supply equipment E is electrically connected with the user power supply equipment H, and a live line C and a zero line N of the three-phase power supply equipment provide a working power supply for the fault detection equipment. In fig. 8 and 9, among others, a three-phase power supply apparatus E includes: the alternating current system comprises commercial alternating current E1, three resistors L1, L2 and L3 arranged on three live wires A, B and C, and a zero wire N; the voltage detection device comprises a voltage detection circuit; the fault detection device includes a processor. Among them, the voltage detection means F is provided on the current input end side of the three resistors L1, L2, and L3 in fig. 8, and is provided on the current output end side of the three resistors L1, L2, and L3 in fig. 9. The voltage vector diagram between the live lines a, B and C and the neutral line N in the three-phase power supply device can be referred to fig. 10.
The voltage detection device, i.e. the voltage detection circuit in fig. 8 and 9, is configured to detect an analog voltage between two voltage lines of which the voltage needs to be detected, and send the detected analog voltage to the processor of the fault detection device G. The fault detection device in fig. 8 and 9 is used to implement the following three steps: performing Analog-to-Digital (A/D) conversion on the received Analog voltage to obtain a numerical voltage value; carrying out power supply open-phase fault diagnosis and analysis on the digitized 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 may be a microcontroller.
Taking the connection mode between the three-phase power supply equipment E and the voltage detection device F shown in fig. 8 as an example, when the circuit shown in fig. 11a is used for collecting the line voltage V between the live line a and the live line B through the voltage detection device F including two voltage detection circuits BA And a line voltage V between the live lines B and C CB And then sent to the fault detection device G. Fault detection device G from line voltage V BA And V CB Calculating the corresponding effective voltage value U BA And U CB (ii) a Effective value of slave voltage U BA And U CB Determining the maximum effective value and the minimum effective value; if the minimum effective value is smaller than the first voltage threshold value, judging that the problem of phase loss of the live wire exists; wherein, the value range of the first voltage threshold can be
Figure BDA0003085747180000142
Preferably, the first voltage threshold may be (5v, 270v). Further, if the maximum effective value is smaller than the first voltage threshold, the phase loss of the live wire B is judged; otherwise, the phase loss of the live wire A is judged. In this embodiment, vm is a vector magnitude of the phase voltage, and after two sets of line voltages are detected, the vector magnitude obtained according to different open-phase conditions can be as shown in table 1.
TABLE 1
Figure BDA0003085747180000141
In the case of a circuit shown in FIG. 11b for detecting the phase voltage V between the live line A and the neutral line N by means of a voltage detection device comprising two voltage detection circuits AN And the phase voltage V between the live line B and the neutral line N BN And then sent to the fault detection equipment. The fault detection means being responsive to the phase voltage V AN And V BN Calculating the corresponding effective voltage value U AN And U BN (ii) a Effective value of slave voltage U AN And U BN Determining the maximum effective value and the minimum effective value; if the minimum effective value is smaller than the first voltage threshold value, judging that the problem of phase loss of the live wire exists; wherein, the value range of the first voltage threshold can be (0, vm); preferably, the first voltage threshold may be (5v, 150v). Further, if the phase voltage U is equal to the phase voltage U AN If the voltage is less than the first voltage threshold, determining that the live wire A is in phase failure; if the phase voltage U is equal BN And if the voltage is smaller than the first voltage threshold, determining that the live wire B is in a default phase. In this embodiment, vm is a vector magnitude of a phase voltage, two sets of phase voltages are detected, and the vector magnitudes obtained according to different open-phase conditions can be shown in table 2.
In order to detect the phase voltage V between the live line A and the neutral line N by means of a voltage detection device comprising two voltage detection circuits by means of the circuit shown in FIG. 11c AN And line voltage V between line A and line B AB And then sending the voltage to fault detection equipment, namely, one live wire of the detected line voltage and the live wire of the detected phase voltage are the same live wire. The fault detection means being responsive to the phase voltage V AN Neutral line voltage V AB Calculating the corresponding effective voltage value U AN And U AB (ii) a Phase voltage effective value U AN Less than a first voltage threshold, or line voltage rms U AB If the voltage is less than the second voltage threshold, judging that the problem of phase loss of the live wire exists; wherein, the value range of the first voltage threshold can be (0, vm); preferably, the first voltage threshold may be (5v, 150v); the value range of the second voltage threshold may be
Figure BDA0003085747180000151
Preferably, the second voltage threshold may be (5v,270v). Further onIf the phase voltage has an effective value U AN If the voltage is less than the first voltage threshold, determining that the live wire A is in phase failure; if the phase voltage has an effective value U AN Greater than a first voltage threshold and a line voltage effective value U AB And if the voltage is less than the second voltage threshold, determining that the live wire B is in a phase loss state. In the embodiment, vm is a phase voltage vector magnitude, two groups of voltages are detected, and a phase voltage BN and a line voltage V are collected according to different phase-lacking conditions BA The vector magnitudes to be analyzed can be shown in table 3.
TABLE 2
Figure BDA0003085747180000152
TABLE 3
Figure BDA0003085747180000153
In the case of a circuit shown in FIG. 11d for detecting the phase voltage V between the live line A and the neutral line N by means of a voltage detection device comprising two voltage detection circuits AN And line voltage V between line B and line C BC And then sent to the fault detection device, namely one live wire of the detected line-to-line voltage is not the same live wire of the detected phase voltage. The fault detection means being responsive to the phase voltage V AN Sum line voltage V BC Calculating the corresponding effective voltage value U AN And U BC (ii) a Phase voltage effective value U AN Less than a first voltage threshold, or line voltage effective value U BC If the voltage is less than the second voltage threshold, judging that the problem of phase loss of the live wire exists; wherein, the value range of the first voltage threshold can be (0, vm); preferably, the first voltage threshold may be (5v, 150v); the value range of the second voltage threshold may be
Figure BDA0003085747180000161
Preferably, the second voltage threshold may be (5v, 270v). Further, if the phase voltage has an effective value U AN If the voltage is less than the first voltage threshold, determining that the live wire A is in phase failure; if the line voltage hasEffective value U BC And if the voltage is less than the second voltage threshold, determining that the live wire B is in a default phase. In this embodiment, vm is a vector magnitude of the phase voltage, two sets of voltages are detected, and the obtained vector magnitude can be shown in table 4 according to different open-phase conditions.
TABLE 4
Figure BDA0003085747180000162
In some application scenarios, phase voltage V can also be acquired BN Neutral line voltage V AC For analysis.
Based on the connection mode between the three-phase power supply equipment E and the voltage detection device F shown in fig. 8 or 9, the voltage detection device F may also include a circuit for collecting the line voltage V BA Line voltage V CB Line voltage V AC Phase voltage V AN And phase voltage V BN In an actual application process, only two voltage detection circuits in the corresponding embodiments shown in fig. 11a to 11d may be started to collect corresponding voltages, so as to obtain a first target voltage and a second target voltage.
Note that, as shown in fig. 12, the voltage detection circuit in fig. 11a to 11d may include: the resistors R1, R2, R3 and R4, the operational amplifier Y, the direct current power supply DC and GND are grounded ends, the two ends where the resistors R1 and R2 are located are voltage input ends of the voltage detection circuit, and the output end of the operational amplifier Y is an output end of the voltage detection circuit.
It should be noted that the first live wire, the second live wire and the third live wire may be interchanged in the practical process.
It should be noted that, for the description of the same steps and the same contents in this embodiment as those in other embodiments, reference may be made to the description in the other embodiments, which is not repeated herein.
In the embodiment of the application, after the first target voltage and the second target voltage of the three-phase power supply equipment are detected, a fault detection result is determined based on the first target voltage and the second target voltage, and if the fault detection result indicates that the three-phase power supply equipment has a live wire phase-loss fault, first prompt information is generated. Therefore, the fault detection result is obtained by analyzing the two target voltages of the three-phase power supply equipment, and the first prompt information is generated when the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault, so that the problem of low open-phase detection efficiency in the existing three-phase four-wire system power supply equipment is solved, the method for rapidly detecting the open-phase problem in the three-phase four-wire system power supply equipment and giving an alarm is realized, and the open-phase detection efficiency is improved.
Based on the foregoing embodiments, an embodiment of the present application provides a fault detection apparatus, where the fault detection apparatus is connected to a first live wire and a neutral wire of a three-phase power supply device to obtain an operating power supply, and as shown in fig. 13, the fault detection apparatus 3 may include: a detection unit 31, a determination unit 32, and a generation unit 33; wherein:
a detection unit 31 for detecting a first target voltage and a second target voltage of the three-phase power supply apparatus; the first target voltage and the second target voltage do not comprise phase voltages corresponding to the first live wire;
a determination unit 32 for determining a fault detection result based on the first target voltage and the second target voltage; the fault detection result is used for indicating whether the phase-lack fault of the live wire occurs in the three-phase power supply equipment;
the generating unit 33 is configured to generate first prompt information if the fault detection result indicates that the phase-missing live wire fault exists in the three-phase power supply device; the first prompt information is used for prompting that the three-phase power supply equipment has a live wire phase loss fault.
In other embodiments of the present application, the determining unit includes: a first determination module and a second determination module; wherein:
the first determination module is used for determining a first effective value of the first target voltage and a second effective value of the second target voltage;
and the second determining module is used for determining the fault detection result based on the first effective value and the second effective value.
In other embodiments of the present application, the second determining module is specifically configured to implement the following steps:
if the first target voltage and the second target voltage are both line voltages, determining a first minimum effective value and a maximum effective value from the first effective value and the second effective value;
if the first minimum effective value is smaller than the first voltage threshold, determining that the fault detection result indicates that the three-phase power supply equipment has a live wire phase-lack fault; wherein the first voltage threshold is greater than 0 and less than
Figure BDA0003085747180000181
Multiple phase voltage vector magnitude.
In other embodiments of the present application, the determining unit, after determining the fault detection result based on the first target voltage and the second target voltage, is further configured to perform the following steps:
under the condition that the shared live wire of the first target voltage and the second target voltage is the live wire except the first live wire, if the fault detection result indicates that the three-phase power supply equipment has a live wire default phase fault and the maximum effective value is greater than or equal to a first voltage threshold value, determining the live wires except the first live wire and the shared live wire to be default phases;
generating second prompt information for indicating that the live wires except the first live wire and the shared live wire are out of phase;
under the condition that the shared live wire of the first target voltage and the second target voltage is the first live wire, if the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault and the maximum effective value is greater than or equal to a first voltage threshold value, determining the live wires except the first live wire corresponding to the minimum effective value to be open-phase;
generating third prompt information for indicating that the third live wire is open of phase;
under the condition that the shared live wire of the first target voltage and the second target voltage is the first live wire, if the fault detection result indicates that the three-phase power supply equipment has a live wire default phase fault and the maximum effective value is smaller than a first voltage threshold value, determining that all live wires except the first live wire in the three-phase power supply equipment are in default phase;
and generating fourth prompt information for indicating that all live wires except the first live wire in the three-phase power supply equipment are in phase failure.
In other embodiments of the present application, the second determining module is further specifically configured to implement the following steps:
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; wherein the first target voltage and the second target voltage are independent of the first hot line;
if the second minimum effective value is smaller than the second voltage threshold, determining that the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment; and the second voltage threshold is greater than 0 and less than or equal to the phase voltage vector magnitude.
In other embodiments of the present application, after the determining unit executes the step of determining the fault detection result based on the first target voltage and the second target voltage, the determining unit is further configured to execute the following steps:
if the fault detection result indicates that the live wire open-phase fault exists in the three-phase power supply equipment and the first effective value is smaller than the second voltage threshold, determining that the live wire corresponding to the first target voltage is open-phase;
generating fifth prompt information for indicating that the live wire corresponding to the first target voltage is in a phase failure state;
if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment and the second effective value is smaller than the second voltage threshold, determining the live wire phase-loss corresponding to the second target voltage;
and generating sixth prompt information for indicating that the live wire corresponding to the second target voltage is in a phase failure state.
In other embodiments of the present application, the second determining module is further specifically configured to implement the following steps:
under the condition 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 live wire, if the first effective value is smaller than a third voltage threshold value or the second effective value is smaller than a fourth voltage threshold value, determining that the fault detection result indicates that the live wire phase loss fault exists in the three-phase power supply equipment; wherein 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
Figure BDA0003085747180000191
And the second live wire and the first live wire are not the same live wire.
In other embodiments of the present application, the determining unit, after determining the fault detection result based on the first target voltage and the second target voltage, is further configured to perform the following steps:
if the fault detection result indicates that the phase-lack fault of the live wire exists in the three-phase power supply equipment, the first effective value is greater than or equal to a third voltage threshold, and the second effective value is smaller than a fourth voltage threshold, determining that the phase of the third live wire is lack; the third live wire is a live wire except the first live wire and the second live wire in the three-phase power supply equipment;
and generating seventh prompt information for indicating that the third live wire is in a default phase.
In other embodiments of the present application, the second determining module is further specifically configured to perform the following steps:
under the conditions that the first target voltage is a phase voltage, 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 smaller than a fifth voltage threshold value or the second effective value is smaller than a sixth voltage threshold value, determining that the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment; wherein the fifth voltage threshold is greater than 0 and smaller than the phase voltage vector magnitude, and the sixth voltage threshold is greater than 0 and smaller than
Figure BDA0003085747180000192
Multiple phase voltage vector magnitude.
In other embodiments of the present application, the determining unit, after determining the fault detection result based on the first target voltage and the second target voltage, is further configured to perform the following steps:
if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment and the first effective value is smaller than the fifth voltage threshold, determining the live wire phase-loss corresponding to the first target voltage;
generating eighth prompt information for indicating that the live wire corresponding to the first target voltage is open of phase;
if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment and the second effective value is smaller than the sixth voltage threshold, determining a fourth live wire phase-loss corresponding to the second target voltage; the fourth live wire is a live wire except for the first live wire and the live wire corresponding to the first target voltage in the three-phase power supply equipment;
and generating ninth prompt information for indicating that the fourth live wire is in a default phase.
It should be noted that, for a specific implementation process of information interaction between units and modules in this embodiment, reference may be made to the implementation process in the fault detection method provided in the embodiments corresponding to fig. 1 to 6, and details are not described here again.
In the embodiment of the application, after the first target voltage and the second target voltage of the three-phase power supply equipment are detected, a fault detection result is determined based on the first target voltage and the second target voltage, and if the fault detection result indicates that the three-phase power supply equipment has a phase-missing live wire fault, first prompt information is generated. Therefore, the fault detection result is obtained by analyzing the two target voltages of the three-phase power supply equipment, and the first prompt information is generated when the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault, so that the problem of low open-phase detection efficiency in the existing three-phase four-wire system power supply equipment is solved, the method for rapidly detecting the open-phase problem in the three-phase four-wire system power supply equipment and giving an alarm is realized, and the open-phase detection efficiency is improved.
Based on the foregoing embodiments, an embodiment of the present application provides a fault detection device, where the fault detection device is connected to a first live wire and a first neutral wire of a three-phase power supply device to obtain an operating power supply, and as shown in fig. 14, the fault detection device 4 may include: a detection circuit 41 and a processor 42; wherein:
a detection circuit 41 for detecting a first target voltage and a second target voltage of the three-phase power supply apparatus and sending the first target voltage and the second target voltage to the processor; the first target voltage and the second target voltage do not comprise phase voltages corresponding to the first live wire;
a processor 42 for receiving the first target voltage and the second target voltage, and determining a fault detection result based on the first target voltage and the second target voltage; the fault detection result is used for indicating whether the phase-lack fault of the live wire occurs in the three-phase power supply equipment; if the fault detection result indicates that the live wire open-phase fault exists in the three-phase power supply equipment, generating first prompt information; the first prompt information is used for prompting that the three-phase power supply equipment has a live wire phase-loss fault.
In other embodiments of the present application, the specific implementation process of the processor 42 may refer to implementation processes of the methods shown in fig. 1 to 6, and details are not described here. When the failure detection device includes the voltage detection device, the detection circuit 41 is the aforementioned voltage detection circuit.
Based on the foregoing embodiments, embodiments of the present application provide a three-phase power supply system, and as shown in fig. 15, the three-phase power supply system 5 may include: a three-phase power supply device 51 for supplying three-phase power and a fault detection device 52 for implementing the fault detection method of fig. 1 to 6; wherein: the specific implementation process of the fault detection device 52 may refer to the implementation processes of the methods shown in fig. 1 to 6, and details are not described here. Here, the three-phase power feeding device 51 is the same device as the three-phase power feeding device E, and the failure detection device 52 is the same device as the failure detection device G.
Based on the foregoing embodiments, embodiments of the present application provide a computer-readable storage medium, which is referred to as a storage medium for short, where the computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the implementation process of the fault detection method provided in the embodiments corresponding to fig. 1 to 6, and details are not described here again.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application.

Claims (14)

1. A fault detection method is applied to a fault detection device, the fault detection device is connected with a first live wire and a first zero wire of a three-phase power supply device to obtain a working power supply, and the method comprises the following steps:
detecting 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 comprises a phase voltage corresponding to a first hot wire;
determining a fault detection result based on the first target voltage and the second target voltage; the fault detection result is used for indicating whether the three-phase power supply equipment has a live wire phase loss fault or not;
if the fault detection result indicates that the live wire open-phase fault exists in the three-phase power supply equipment, generating first prompt information; and the first prompt information is used for prompting that the three-phase power supply equipment has a live wire open-phase fault.
2. The method of claim 1, wherein determining a 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.
3. The method according to claim 2, wherein the determining the fault detection result based on the first valid value and the second valid value comprises:
if the first target voltage and the second target voltage are both line voltages, determining a first minimum effective value and a maximum effective value from the first effective value and the second effective value;
if the first minimum effective value is smaller than a first voltage threshold, determining that the fault detection result indicates that a live wire phase-loss fault exists in the three-phase power supply equipment; wherein the first voltage threshold is greater than 0 and less than √ 3 times the magnitude of the phase voltage vector.
4. The method of claim 3, wherein after determining the fault detection result based on the first target voltage and the second target voltage, the method further comprises:
under the condition that the shared live wire of the first target voltage and the second target voltage is a live wire except the first live wire, if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment and the maximum effective value is greater than or equal to the first voltage threshold value, determining the live wire phase-loss except the first live wire and the shared live wire;
generating second prompt information for indicating that the live wires except the first live wire and the common live wire are out of phase;
under the condition that the common live wire of the first target voltage and the second target voltage is the first live wire, if the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault and the maximum effective value is greater than or equal to the first voltage threshold, determining the live wire open-phase corresponding to the minimum effective value except the first live wire;
generating third prompt information for indicating that the live wires except the first live wire corresponding to the first minimum effective value are open of phase;
under the condition that the shared live wire of the first target voltage and the second target voltage is the first live wire, if the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault and the maximum effective value is smaller than the first voltage threshold, determining that all live wires except the first live wire in the three-phase power supply equipment are open-phase;
and generating fourth prompt information for indicating that all live wires except the first live wire in the three-phase power supply equipment are in phase failure.
5. The method according to claim 2, wherein the determining the fault detection result based on the first valid value and the second valid value comprises:
if the first target voltage and the second target voltage are both phase voltages, determining a second minimum effective value from the first effective value and the second effective value;
if the second minimum effective value is smaller than a second voltage threshold, determining that the fault detection result indicates that a live wire phase-loss fault exists in the three-phase power supply equipment; and the second voltage threshold is greater than 0 and less than or equal to the phase voltage vector magnitude.
6. The method of claim 5, wherein after determining a 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 live wire phase-loss fault exists in the three-phase power supply equipment and the first effective value is smaller than the second voltage threshold, determining the live wire phase-loss corresponding to the first target voltage;
generating fifth prompt information for indicating that the live wire corresponding to the first target voltage is in a phase failure state;
if the fault detection result indicates that the live wire open-phase fault exists in the three-phase power supply equipment and the second effective value is smaller than the second voltage threshold, determining that the live wire corresponding to the second target voltage is open-phase;
and generating sixth prompt information for indicating that the live wire corresponding to the second target voltage is open of phase.
7. The method of claim 2, wherein the determining the fault detection result based on the first valid value and the second valid value comprises:
when the first target voltage is a phase voltage, the second target voltage is a line voltage, and the first target voltage and the second target voltage share a second live line, if the first effective value is smaller than a third voltage threshold value, or the second effective value is smaller than a fourth voltage threshold value, determining that the fault detection result indicates that a live line open-phase fault exists in the three-phase power supply equipment; wherein the third voltage threshold is greater than 0 and less than the phase voltage vector magnitude, the fourth voltage threshold is greater than 0 and less than √ 3 times the phase voltage vector magnitude, and the second hot wire is not the same hot wire as the first hot wire.
8. The method of claim 7, wherein after determining a 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 live wire open-phase fault exists in the three-phase power supply equipment, the first effective value is greater than or equal to the third voltage threshold, and the second effective value is smaller than the fourth voltage threshold, determining that a third live wire is open-phase; the third live wire is a live wire of the three-phase power supply equipment except the first live wire and the second live wire;
and generating seventh prompt information for indicating that the third live wire is open of phase.
9. The method according to claim 2, wherein the determining the fault detection result based on the first valid value and the second valid value comprises:
under the condition that the first target voltage is a phase voltage, 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 smaller than a fifth voltage threshold value, or the second effective value is smaller than a sixth voltage threshold value, determining that the fault detection result is that the live wire phase-loss fault exists in the three-phase power supply equipment; wherein 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 √ 3 times the phase voltage vector magnitude.
10. The method of claim 9, wherein after determining a 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 live wire open-phase fault exists in the three-phase power supply equipment and the first effective value is smaller than the fifth voltage threshold, determining that the live wire corresponding to the first target voltage is open-phase;
generating eighth prompt information for indicating that the live wire corresponding to the first target voltage is open of phase;
if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment and the second effective value is smaller than the sixth voltage threshold, determining a fourth live wire phase-loss corresponding to the second target voltage; the fourth live wire is a live wire of the three-phase power supply equipment except for the live wires corresponding to the first live wire and the first target voltage;
and generating ninth prompt information for indicating that the fourth live wire is in a default phase.
11. A fault detection device for connection to first live and neutral conductors of a three-phase power supply apparatus to obtain operating power, the device comprising: a detection unit, a determination unit and a generation unit; wherein:
the detection unit is used for detecting a first target voltage and a second target voltage of the three-phase power supply equipment; the first target voltage and the second target voltage do not comprise phase voltage corresponding to a first live wire;
the determination unit is used for determining a fault detection result based on the first target voltage and the second target voltage; the fault detection result is used for indicating whether the phase-lack fault of the live wire occurs in the three-phase power supply equipment;
the generating unit is used for generating first prompt information if the fault detection result indicates that the three-phase power supply equipment has a live wire open-phase fault; and the first prompt information is used for prompting that the three-phase power supply equipment has a live wire open-phase fault.
12. A fault detection device for connection to a first live and neutral line of a three-phase power supply to obtain operating power, the device comprising: 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; the first target voltage and the second target voltage do not comprise phase voltage corresponding to a first live wire;
the processor is used for receiving the first target voltage and the second target voltage, and determining a fault detection result based on the first target voltage and the second target voltage; the fault detection result is used for indicating whether the phase-lack fault of the live wire occurs in the three-phase power supply equipment; if the fault detection result indicates that the live wire phase-loss fault exists in the three-phase power supply equipment, generating first prompt information; and the first prompt information is used for prompting that the three-phase power supply equipment has a live wire open-phase fault.
13. A three-phase power supply system, characterized in that the three-phase power supply system comprises: a three-phase power supply apparatus for supplying three-phase power and a fault detection apparatus as claimed in claim 12.
14. A storage medium, characterized in that the storage medium has stored thereon a failure detection program which, when executed by a processor, implements the steps of the failure detection method according to any one of claims 1 to 10.
CN202110579833.8A 2021-05-26 2021-05-26 Fault detection method, device, equipment, system and storage medium Pending CN115407231A (en)

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