CN110098595B - Open-phase and reverse-phase protection method and device for three-phase power supply - Google Patents
Open-phase and reverse-phase protection method and device for three-phase power supply Download PDFInfo
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- CN110098595B CN110098595B CN201910422870.0A CN201910422870A CN110098595B CN 110098595 B CN110098595 B CN 110098595B CN 201910422870 A CN201910422870 A CN 201910422870A CN 110098595 B CN110098595 B CN 110098595B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
- H02H3/343—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system using phase sequence analysers
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Abstract
The invention provides a three-phase power supply open-phase and reverse-phase protection method and a device, comprising the following steps: when a three-phase power supply to be detected is electrified, acquiring a first electric signal output by a first end and a second electric signal output by a second end of an electric control board, wherein the first electric signal and the second electric signal are signals of a first phase current, a second phase current and a third phase current output by the three-phase power supply to be detected after being rectified by the electric control board; determining whether the three-phase power supply to be detected is in reverse phase or not according to the first electric signal and the second electric signal, if so, executing S3, otherwise, executing S4; s3: outputting first prompt information for prompting the reverse phase of the three-phase power supply to be detected, and executing S6; s4: determining whether the three-phase power supply to be detected is in a phase failure state or not according to the first electric signal and the second electric signal, and if so, executing S5; s5: outputting second prompt information for prompting the phase failure of the three-phase power supply to be detected, and executing S6; s6: and controlling the motor to stop running. The scheme can improve the efficiency of detecting the phase loss and the phase inversion of the three-phase power supply to be detected.
Description
Technical Field
The invention relates to the field of intelligent household appliances, in particular to a method and a device for protecting a three-phase power supply from phase loss and phase inversion.
Background
With the development of economy, household appliances become essential products for people's life, save a lot of housework of people, and make little contribution to the household life.
At present, the household appliance using the three-phase power supply to be detected cannot enable the motor to work in a power supply environment with a phase failure, particularly a reverse phase, or otherwise, the motor can be damaged. Therefore, an equipment inspector is required to manually inspect the to-be-inspected three-phase power supply of the household electrical appliance.
As can be seen from the above description, in the prior art, the efficiency of the inspection is low by manually inspecting whether the three-phase power to be detected of the household electrical appliance is in a phase-loss and phase-inversion state.
Disclosure of Invention
The embodiment of the invention provides a three-phase power supply open-phase and reverse-phase protection method and device, which can improve the efficiency of detecting the open-phase and reverse-phase of a three-phase power supply to be detected.
In a first aspect, an embodiment of the present invention provides a method for protecting a three-phase power supply from phase loss and phase inversion, including:
when the three-phase power supply to be detected is powered on,
s1: acquiring a first electric signal output by a first end of an electric control board and a second electric signal output by a second end of the electric control board, wherein the first electric signal is a signal obtained by rectifying a first phase current and a second phase current output by the three-phase power supply to be detected through the electric control board, and the second electric signal is a signal obtained by rectifying a second phase current and a third phase current output by the three-phase power supply to be detected through the electric control board;
s2: determining whether the three-phase power supply to be detected is in reverse phase or not according to the first electric signal and the second electric signal, if so, executing S3, otherwise, executing S4;
s3: outputting first prompt information for prompting the reverse phase of the three-phase power supply to be detected, and executing S6;
s4: determining whether the three-phase power supply to be detected is in a phase failure state or not according to the first electric signal and the second electric signal, and if so, executing S5;
s5: outputting second prompt information for prompting the phase failure of the three-phase power supply to be detected, and executing S6;
s6: and controlling the motor connected with the three-phase power supply to be detected to stop running.
Preferably, the first and second electrodes are formed of a metal,
before the S2, further comprising:
determining a first time interval between a time point when a rising edge of a third electric signal output by a first end of the electric control board arrives and a time point when a rising edge of a fourth electric signal output by a second end of the electric control board arrives according to periods of a first phase current, a second phase current and a third phase current output by a three-phase power supply normally connected by three phases, wherein the third electric signal is a signal obtained by rectifying the first phase current and the second phase current output by the three-phase power supply normally connected by the three phases through the electric control board, and the fourth electric signal is a signal obtained by rectifying the second phase current and the third phase current output by the three-phase power supply normally connected by the three phases through the electric control board;
the S2, including:
starting timing when the rising edge of the first electric signal is detected;
stopping timing when the rising edge of the second electric signal arrives, and taking the timing duration as a second time interval between the time point when the rising edge of the first electric signal arrives and the time point when the rising edge of the second electric signal arrives;
and determining whether the three-phase power supply is in reverse phase according to the first time interval and the second time interval, if so, executing S3, otherwise, executing S4.
Preferably, the first and second electrodes are formed of a metal,
the determining a first time interval between a time point when a rising edge of a third electric signal output by the first end of the electric control board arrives and a time point when a rising edge of a fourth electric signal output by the second end of the electric control board arrives according to a cycle of a first phase current, a second phase current and a third phase current output by a three-phase power supply normally connected by three phase lines includes:
determining a first time interval between a time point when a rising edge of a third electric signal output by the first end of the electric control board arrives and a time point when a rising edge of a fourth electric signal output by the second end of the electric control board arrives according to the following formula:
and S represents the first time interval, and T represents the periods of the first phase current, the second phase current and the third phase current output by the three-phase power supply which is normally connected with the three-phase lines.
Preferably, the first and second electrodes are formed of a metal,
determining whether the three-phase power is in reverse phase according to the first time interval and the second time interval, if so, executing S3, otherwise, executing S4, including:
determining whether the difference between the second time interval and the first time interval is greater than a preset threshold, if so, performing S3, otherwise, performing S4.
Preferably, the first and second electrodes are formed of a metal,
the S4, including:
d1: determining whether the duration of the first electric signal in the same logic level state is greater than at least one period of the first phase current, the second phase current and the third phase current output by the three-phase power supply to be detected, if so, executing S5, otherwise, executing D2;
d2: determining whether the duration of the second electrical signal being in the same logic level state is greater than at least one of the periods, and if so, executing the step S5.
Preferably, the first and second electrodes are formed of a metal,
when the three-phase power supply to be detected is powered on,
before the S1, further comprising:
and determining whether the electric control board connected with the three-phase power supply to be detected loses power, if so, executing the step S5, otherwise, executing the step S1.
In a second aspect, an embodiment of the present invention provides a phase-loss and phase-inversion protection device for a three-phase power supply, including:
and the signal acquisition module is used for executing S1 when the three-phase power supply to be detected is electrified: acquiring a first electric signal output by a first end of an electric control board and a second electric signal output by a second end of the electric control board, wherein the first electric signal is a signal obtained by rectifying a first phase current and a second phase current output by the three-phase power supply to be detected through the electric control board, and the second electric signal is a signal obtained by rectifying a second phase current and a third phase current output by the three-phase power supply to be detected through the electric control board;
a signal detection module for performing S2: determining whether the three-phase power supply to be detected is in a reverse phase according to the first electric signal and the second electric signal acquired by the signal acquisition module, and if so, triggering an information output module to execute S3: outputting first prompt information for prompting the reverse phase of the three-phase power supply to be detected, and triggering a motor stopping module; otherwise, go to S4; s4: determining whether the three-phase power supply to be detected is open-phase or not according to the first electric signal and the second electric signal, if so, executing S5 by the information output module: outputting second prompt information for prompting the phase failure of the three-phase power supply to be detected, and triggering the motor stopping module;
the motor stopping module is used for executing S6: and controlling the motor connected with the three-phase power supply to be detected to stop running.
Preferably, the first and second electrodes are formed of a metal,
further comprising: an information determination module;
the information determining module is configured to determine, according to a period of a first phase current, a second phase current and a third phase current output by a three-phase power supply to which three phase lines are normally connected, a time point when a rising edge of a third electrical signal output by a first end of the electronic control board arrives and a first time interval between a time point when a rising edge of a fourth electrical signal output by a second end of the electronic control board arrives, where the third electrical signal is a signal obtained by rectifying the first phase current and the second phase current output by the three-phase power supply to which the three phase lines are normally connected by the electronic control board, and the fourth electrical signal is a signal obtained by rectifying the second phase current and the third phase current output by the three-phase power supply to which the three phase lines are normally connected by the electronic control board;
the signal detection module is used for starting timing when the rising edge of the first electric signal is detected to arrive;
stopping timing when the rising edge of the second electric signal arrives, and taking the timing duration as a second time interval between the time point when the rising edge of the first electric signal arrives and the time point when the rising edge of the second electric signal arrives;
and determining whether the three-phase power supply is in reverse phase according to the first time interval and the second time interval, if so, executing S3, otherwise, executing S4.
Preferably, the first and second electrodes are formed of a metal,
the information determining module is used for determining a first time interval between a time point when a rising edge of a third electric signal output by the first end of the electric control board arrives and a time point when a rising edge of a fourth electric signal output by the second end of the electric control board arrives according to the following formula:
and S represents the first time interval, and T represents the periods of the first phase current, the second phase current and the third phase current output by the three-phase power supply which is normally connected with the three-phase lines.
Preferably, the first and second electrodes are formed of a metal,
the signal detection module is configured to determine whether a difference between the second time interval and the first time interval is greater than a preset threshold, if so, perform S3, otherwise, perform S4.
Preferably, the first and second electrodes are formed of a metal,
the signal detection module is configured to perform:
d1: determining whether the duration of the first electric signal in the same logic level state is greater than at least one period of the first phase current, the second phase current and the third phase current output by the three-phase power supply to be detected, if so, executing S5, otherwise, executing D2;
d2: determining whether the duration of the second electrical signal being in the same logic level state is greater than at least one of the periods, and if so, executing the step S5.
Preferably, the first and second electrodes are formed of a metal,
the open-phase and reverse-phase protection device for the three-phase power supply further comprises: a power-on detection module;
the power-on detection module is used for determining whether the electric control board connected with the three-phase power supply to be detected loses power or not when the three-phase power supply to be detected is powered on, if so, executing the S5, otherwise, executing the S1.
The invention provides a protection method and a device for a three-phase power supply to be detected, which can determine whether the three-phase power supply to be detected is in phase failure or reverse phase according to a first electric signal formed by converting a first phase current and a second phase current output by the three-phase power supply to be detected through an electric control board and a second electric signal formed by rectifying the second phase current and a third phase current output by the three-phase power supply to be detected, and can output prompt information for prompting the reverse phase of the three-phase power supply to be detected when the three-phase power supply to be detected is in reverse phase so as to externally know the reverse phase of the three-phase power supply to be detected, and can output second prompt information for prompting the phase failure of the three-phase power supply to be detected when the three-phase power supply to be detected is in phase failure so as to externally know the phase failure of the three-phase power supply to be detected, and can shut down the connected motor when the three-phase power supply to be detected is in phase failure or reverse phase, to prevent damage to the motor. In conclusion, whether the three-phase power supply to be detected is in the phase-lack reverse phase or not can be determined by detecting the first electric signal and the second electric signal formed by rectifying the first phase current, the second phase current and the third phase current of the three-phase power supply to be detected through the electric control board, the phase-lack reverse phase of the three-phase power supply to be detected does not need to be detected manually, the time for detecting the phase-lack reverse phase of the three-phase power supply to be detected can be shortened, and the efficiency for detecting the phase-lack reverse phase of the three-phase power supply to be detected is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a method for open-phase and reverse-phase protection of a three-phase power supply according to an embodiment of the present invention;
fig. 2 is a timing chart of a third electrical signal and a fourth electrical signal output by the electronic control board according to an embodiment of the present invention;
fig. 3 is a timing chart of the first electrical signal and the second electrical signal output by the electronic control board when the first phase and the third phase of the three-phase power source to be detected are connected in a reverse phase manner according to an embodiment of the present invention;
fig. 4 is a timing chart of the first electrical signal and the second electrical signal output by the electronic control board when the first phase and the second phase of the three-phase power to be detected are normally connected and the third phase is out of phase according to the embodiment of the invention;
fig. 5 is a flowchart of another phase-loss and phase-reversal protection method for a three-phase power supply according to an embodiment of the present invention;
fig. 6 is a circuit diagram of an electric control board according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a phase-loss and phase-inversion protection device for a three-phase power supply according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a method for protecting a three-phase power supply from phase loss and phase inversion, including:
s1: when a three-phase power supply to be detected is powered on, acquiring a first electric signal output by a first end of an electric control board and a second electric signal output by a second end of the electric control board, wherein the first electric signal is a signal obtained by rectifying a first phase current and a second phase current output by the three-phase power supply to be detected through the electric control board, and the second electric signal is a signal obtained by rectifying a second phase current and a third phase current output by the three-phase power supply to be detected through the electric control board;
s2: determining whether the three-phase power supply to be detected is in reverse phase or not according to the first electric signal and the second electric signal, if so, executing S3, otherwise, executing S4;
s3: outputting first prompt information for prompting the reverse phase of the three-phase power supply to be detected, and executing S6;
s4: determining whether the three-phase power supply to be detected is in a phase failure state or not according to the first electric signal and the second electric signal, and if so, executing S5;
s5: outputting second prompt information for prompting the phase failure of the three-phase power supply to be detected, and executing S6;
s6: and controlling the motor connected with the three-phase power supply to be detected to stop running.
In the embodiment of the invention, the first electric signal formed by converting the first phase current and the second phase current output by the three-phase power supply to be detected is acquired by the electric control board, and a second electric signal formed by rectifying a second phase current and a third phase current output by the three-phase power supply to be detected, it is possible to determine whether the three-phase power to be detected is open-phase or reverse-phase based on the first and second electrical signals, and outputs prompt information for prompting the reverse phase of the three-phase power supply to be detected when the three-phase power supply to be detected is in the reverse phase so as to facilitate the external understanding of the reverse phase of the three-phase power supply to be detected, when the three-phase power supply to be detected is out of phase, outputting second prompt information for prompting the three-phase power supply to be detected to be out of phase so as to facilitate the external understanding of the three-phase power supply to be detected, when the three-phase power supply to be detected is in phase failure or reverse phase, the connected motor needs to be stopped to prevent the motor from being damaged. In conclusion, whether the phase-lack and the phase-reversal of the three-phase power supply to be detected can be determined by detecting the first electric signal and the second electric signal formed by rectifying the first phase current, the second phase current and the third phase current of the three-phase power supply to be detected through the electric control board, and the phase-lack and the phase-reversal of the three-phase power supply to be detected do not need to be detected manually, so that the cost of the phase-lack and the phase-reversal of the three-phase power supply to be detected can be reduced, the time for detecting the phase-lack and the phase-reversal of the three-phase power supply to be detected can be shortened, and the efficiency for detecting the phase-lack and the phase-reversal of the three-phase power supply to be detected is improved.
In an embodiment of the present invention, before the S2, the method further includes:
determining a first time interval between a time point when a rising edge of a third electric signal output by a first end of the electric control board arrives and a time point when a rising edge of a fourth electric signal output by a second end of the electric control board arrives according to periods of a first phase current, a second phase current and a third phase current output by a three-phase power supply normally connected by three phases, wherein the third electric signal is a signal obtained by rectifying the first phase current and the second phase current output by the three-phase power supply normally connected by the three phases through the electric control board, and the fourth electric signal is a signal obtained by rectifying the second phase current and the third phase current output by the three-phase power supply normally connected by the three phases through the electric control board;
the S2, including:
starting timing when the rising edge of the first electric signal is detected;
stopping timing when the rising edge of the second electric signal arrives, and taking the timing duration as a second time interval between the time point when the rising edge of the first electric signal arrives and the time point when the rising edge of the second electric signal arrives;
and determining whether the three-phase power supply is in reverse phase according to the first time interval and the second time interval, if so, executing S3, otherwise, executing S4.
In the embodiment of the invention, a first time interval between a third electrical signal formed by rectifying a first phase current and a second phase current output by the three-phase power supply when the three-phase electric wires are normally connected and a fourth electrical signal formed by rectifying the second phase current and the third phase current output by the three-phase power supply and the electric control board when the three-phase power supply outputs the three-phase alternating current can be determined according to the period of outputting the three-phase alternating current by the three-phase power supply normally connected with the three-phase electric wires. The timing is started when the rising edge of a first electric signal obtained after rectifying a first phase current and a second phase current of a three-phase power supply to be detected arrives at the electric control board, the timing is stopped when the rising edge of a second electric signal obtained after rectifying the second phase current and the third phase current of the three-phase power supply to be detected arrives at the electric control board, a second time interval between the rising edge of the first electric signal and the rising edge of the second electric signal can be determined, according to the second time interval and the first time interval, whether the anti-phase condition exists in the three-phase power supply to be detected can be determined, the anti-phase condition of the three-phase power supply to be detected does not need to be detected manually, the time for detecting the anti-phase condition of the three-phase power supply to be detected can be shortened, and the efficiency for detecting the anti-phase of the three-phase power is improved.
In an embodiment of the present invention, the determining, according to the periods of the first phase current, the second phase current, and the third phase current output by the three-phase power supply with the three-phase normal connection, a first time interval between a time point when a rising edge of the third electrical signal output by the first end of the electronic control board arrives and a time point when a rising edge of the fourth electrical signal output by the second end of the electronic control board arrives includes:
determining a first time interval between a time point when a rising edge of a third electric signal output by the first end of the electric control board arrives and a time point when a rising edge of a fourth electric signal output by the second end of the electric control board arrives according to the following formula:
and S represents the first time interval, and T represents the periods of the first phase current, the second phase current and the third phase current output by the three-phase power supply which is normally connected with the three-phase lines.
In the embodiment of the present invention, since the first phase current, the second phase current and the third phase current output by the three-phase power supply with the normally connected three-phase lines are all sine waves, through the above formula, the first time interval between the arrival of the rising edge of the third electrical signal obtained by rectifying the first phase current and the second phase current of the normally connected three-phase power supply through the electrical control board and the arrival of the rising edge of the fourth electrical signal obtained by rectifying the second phase current and the third phase current of the three-phase power supply through the electrical control board can be determined.
For example, the third electrical signal is an "RS signal" output by the electronic control board after rectifying the first phase current "R phase electricity" and the second phase current "S phase electricity" of the three-phase power supply to which the three-phase lines are normally connected, and the fourth electrical signal is an "ST signal" output by the electronic control board after rectifying the second phase current "S phase electricity" and the third phase current "T phase electricity" of the three-phase power supply to which the three-phase lines are normally connected.
When the rising edge of the third electric signal arrives, the fourth electric signal has a rising edge through S2/6 × 20, namely about 6.667 milliseconds, so that when the rising edge of the third electric signal arrives, the first time interval between the rising edge of the third electric signal and the rising edge of the fourth electric signal arrives is 6.667 milliseconds.
As shown in fig. 2, timing charts of the third electric signal and the fourth electric signal output by the electronic control board are shown.
As shown in fig. 3, the timing charts of the first electric signal and the second electric signal output by the electronic control board when the first phase and the third phase of the three-phase power to be detected are reversely connected.
In an embodiment of the present invention, the determining whether the three-phase power is in a reverse phase according to the first time interval and the second time interval, if so, performing S3, otherwise, performing S4 includes:
determining whether the difference between the second time interval and the first time interval is greater than a preset threshold, if so, performing S3, otherwise, performing S4.
In the embodiment of the present invention, since there is a delay time in starting timing and a delay time in stopping timing, the sum of the delay times existing in starting timing and stopping timing is used as a preset threshold, for example, 1 millisecond, and it is determined whether the sum of the first time interval and the timed delay time (i.e., the preset threshold) in the rising edge of the first electric signal and the rising edge of the second electric signal when the rising edge of the second electric signal arrives is greater than the sum of the second time interval and the timed delay time (i.e., the preset threshold) in the rising edge of the first electric signal when the rising edge of the second electric signal arrives, and whether the three-phase power to be detected has a reverse phase or not can be determined.
As shown in fig. 4, when the first phase and the second phase of the three-phase power supply to be detected are normally connected and the third phase is out of phase, the timing diagram of the first electrical signal and the second electrical signal output by the electronic control board is shown.
In an embodiment of the present invention, the S4 includes:
d1: determining whether the duration of the first electric signal in the same logic level state is greater than at least one period of the first phase current, the second phase current and the third phase current output by the three-phase power supply to be detected, if so, executing S5, otherwise, executing D2;
d2: determining whether the duration of the second electrical signal being in the same logic level state is greater than at least one of the periods, and if so, executing the step S5.
In the embodiment of the invention, when the duration of the first electric signal or the second electric signal in the high level state or the low level state is longer than at least one period of outputting three-phase power by the three-phase power supply to be detected, the condition that the three-phase power supply to be detected has a phase failure can be determined, so that a fault needs to be reported, namely, second prompt information for prompting the phase failure of the three-phase power supply is output, and the motor stops running so as to prevent the motor from being damaged by the phase failure of the three-phase power supply to be detected.
In one embodiment of the present invention, when the three-phase power source to be tested is powered on,
before the S1, further comprising:
and determining whether the electric control board connected with the three-phase power supply to be detected loses power, if so, executing the step S5, otherwise, executing the step S1.
In the embodiment of the invention, when a certain phase of the three-phase power supply to be detected is out of phase, as the electric control board connected with the phase can not form a loop, the electric control board is out of power, the motor connected with the electric control board can not work, and the fault notification can be carried out by outputting second prompt information for prompting the phase failure of the three-phase power supply to be detected.
In order to more clearly illustrate the technical solution and advantages of the present invention, the following describes in detail a method for protecting a three-phase power supply to be detected from phase loss and phase inversion, which is provided by an embodiment of the present invention, as shown in fig. 5, specifically includes the following steps:
step 501: according to the period of a first phase current, a second phase current and a third phase current output by a three-phase power supply which is normally connected with the three-phase lines, determining a first time interval between a time point when a rising edge of a third electric signal output by a first end of the electric control board arrives and a time point when a rising edge of a fourth electric signal output by a second end of the electric control board arrives, wherein the third electric signal is a signal obtained by rectifying the first phase current and the second phase current output by the three-phase power supply which is normally connected with the three-phase lines through the electric control board, and the fourth electric signal is a signal obtained by rectifying the second phase current and the third phase current output by the three-phase power supply which is normally connected with the three-phase lines through the electric control board.
Specifically, according to the following formula, when a rising edge of a third electrical signal formed by rectifying a first phase current and a second phase current output by a three-phase power supply normally connected with three-phase lines through an electric control board arrives, a first time interval when a rising edge of a fourth electrical signal formed by rectifying the second phase current and the third phase current output by the three-phase power supply normally connected with the three-phase lines through the electric control board arrives is determined according to a period of three-phase power output by the three-phase power supply normally connected with the three-phase lines:
the S represents a first time interval between a time point corresponding to arrival of a rising edge of the third electric signal and a time point corresponding to arrival of a rising edge of the fourth electric signal, and the T represents a period of a first phase current, a second phase current and a third phase current output by a three-phase power supply normally connected with the three-phase line.
For example, if the power frequency of the three-phase current normally connected by the three-phase lines is 60Hz, and the period of the output three-phase current is 1/60 milliseconds, then according to the above formula, when the rising edge of the third electrical signal arrives, the rising edge of the fourth electrical signal arrives through 2/6 × 1/60, that is, about 5.556 milliseconds, and then the first time interval between the arrival of the rising edge of the third electrical signal and the arrival of the rising edge of the fourth electrical signal is 5.556 milliseconds.
Step 502: when the three-phase power supply to be detected is electrified, whether an electric control board connected with the three-phase power supply to be detected loses power is determined, if so, step 510 is executed, otherwise, step 503 is executed.
Specifically, referring to fig. 6, when the R phase of the first phase of the three-phase power supply to be detected is out of phase, the electric control board cannot form a loop, and the L line and the N line in fig. 6 can determine that the electric control board is out of phase, so that a fault shutdown can be reported, that is, prompt information for prompting the phase failure of the three-phase power supply to be detected is output, and the operation of the motor is stopped, so as to prevent the motor from being damaged due to the phase failure of the three-phase power supply to be detected.
Step 503: and acquiring a first electric signal output by the first end of the electric control board and a second electric signal output by the second end of the electric control board.
Specifically, a first electric signal output by the first end of the electric control board is a signal obtained by rectifying a first phase current and a second phase current output by the three-phase power supply to be detected through the electric control board, a second electric signal output by the first end of the electric control board is a signal obtained by rectifying a second phase current and a third phase current output by the three-phase power supply to be detected through the electric control board, and the first electric signal and the second electric signal can determine whether the three-phase power supply to be detected is in an open-phase and reverse-phase state or not, so that the time for detecting the open-phase and reverse-phase of the three-phase power supply to be detected is shortened, and the efficiency for detecting the open-phase and reverse-phase of the three-phase power supply to be detected is improved.
Step 504: when the rising edge of the first electric signal is detected, timing is started.
Step 505: and when the rising edge of the second electric signal arrives, stopping timing, and taking the timing duration as a second time interval between the time point corresponding to the arrival of the rising edge of the first electric signal and the time point corresponding to the arrival of the rising edge of the second electric signal.
Step 506: and determining whether the difference between the second time interval and the first time interval is greater than a preset threshold, if so, executing step 507, otherwise, executing step 508.
Specifically, by detecting a second time interval between a first electric signal output by the electric control board and a second electric signal when a rising edge arrives, a difference between the second time interval and the first time interval can be calculated, and since a delay time exists during timing, for example, 1 millisecond exists, whether the condition that the three-phase power supply to be detected has a reverse phase can be determined by determining whether the difference between the second time interval and the first time interval is greater than a preset threshold value, that is, the delay time during timing.
Step 507: and outputting first prompt information for prompting the reverse phase of the three-phase power supply to be detected, and executing the step 511.
Specifically, when the reverse phase condition of the three-phase power supply to be detected is determined, first prompt information can be output to prompt the reverse phase of the three-phase power supply to be detected, and the motor is stopped to prevent the motor from being damaged due to the phase failure of the three-phase power supply.
Step 508: and determining whether the duration of the first electric signal in the same logic level state is greater than at least one period of the first phase current, the second phase current and the third phase current output by the three-phase power supply to be detected, if so, executing step 510, otherwise, executing step 509.
Step 509: it is determined whether the second electrical signal is in the same logic level state for a period of time greater than at least one cycle, if so, step 510 is performed, otherwise, step 512 is performed.
Specifically, referring to fig. 6, when the S phase is in a phase loss state, since the R phase and the S phase cannot form a loop, and the S phase and the T phase cannot form a loop, although the R phase and the T phase can also form a loop theoretically, the current is insufficient to drive the photocoupler IC1 and the IC2 to be turned on through two current-limiting resistors with larger resistances, such that the first electrical signal output through the resistor R6 and the second electrical signal output through the resistor R7 are both in a high-level state all the time, and therefore, it can be determined that the phase loss state exists in the three-phase power source to be detected. Even if the resistances of the resistor R0 and the resistor R1 are small, the photoelectric coupler IC1 and the photoelectric coupler IC2 are conducted, and the first electric signal output through the resistor R6 and the second electric signal output through the resistor R7 are always in a low level state, so that the phase failure of the three-phase power supply to be detected can be determined. In another case, when the T phase of the three-phase power supply to be detected is out of phase, the R and S phases have normal phases, but the S and T phases cannot turn on the photocoupler IC2 due to the absence of the loop, so that the second electric signal output through the resistor R7 is always in a high level state, and it can be determined that the three-phase power supply to be detected is out of phase.
Step 510: and outputting second prompt information for prompting the phase failure of the three-phase power supply to be detected, and executing 511.
Specifically, when it is determined that the phase-lack condition of the three-phase power supply to be detected exists, second prompt information can be output, the motor is stopped, and the motor is prevented from being damaged due to the phase-lack condition of the three-phase power supply.
Step 511: and controlling the motor connected with the three-phase power supply to be detected to stop running.
Step 512: the current flow is ended.
Specifically, when it is determined that the three-phase power supply to be detected does not have the phase-missing and phase-inversion condition according to the collected first electric signal and second electric signal output by the electric control board, it can be determined that the three-phase lines of the three-phase power supply to be detected are normally connected, so that the current flow can be ended.
Fig. 6 shows that the first phase R, the second phase S, the third phase T, R0-R7 of the three-phase power to be detected are resistors, D1 and D2 are diodes, IC1 and IC2 are photocouplers, D3 and D4 are triodes, N is a neutral point, i.e., a ground line, and a first output end a and a second output end B.
As shown in fig. 7, the present invention provides a phase-loss and phase-inversion protection device for a three-phase power supply, comprising:
the signal acquisition module 701 is configured to, when the three-phase power source to be detected is powered on, execute S1: acquiring a first electric signal output by a first end of an electric control board and a second electric signal output by a second end of the electric control board, wherein the first electric signal is a signal obtained by rectifying a first phase current and a second phase current output by the three-phase power supply to be detected through the electric control board, and the second electric signal is a signal obtained by rectifying a second phase current and a third phase current output by the three-phase power supply to be detected through the electric control board;
a signal detection module 702 configured to execute S2: determining whether the three-phase power supply to be detected is in a reverse phase according to the first electrical signal and the second electrical signal acquired by the signal acquisition module 701, and if so, triggering the information output module 703 to execute S3: outputting first prompt information for prompting the reverse phase of the three-phase power supply to be detected, and triggering a motor stopping module 704; otherwise, go to S4; s4: determining whether the three-phase power supply to be detected is open-phase or not according to the first electric signal and the second electric signal, if so, executing, by the information output module 703, S5: outputting second prompt information for prompting the phase failure of the three-phase power supply to be detected, and triggering the motor stopping module 704;
the motor shutdown module 704 is configured to, when triggered, execute S6: and controlling the motor connected with the three-phase power supply to be detected to stop running.
In the embodiment of the invention, a signal acquisition module acquires a first electric signal formed by converting a first phase current and a second phase current output by a three-phase power supply to be detected through an electric control board, and a second electric signal formed by rectifying the second phase current and a third phase current output by the three-phase power supply to be detected, the signal detection module can determine whether the three-phase power supply to be detected is in a phase failure or reverse phase according to the first electric signal and the second electric signal, and when the three-phase power supply to be detected is in a reverse phase, a trigger information output module outputs prompt information for prompting the reverse phase of the three-phase power supply to be detected so as to externally know the reverse phase of the three-phase power supply to be detected, and when the three-phase power supply to be detected is in a phase failure or reverse phase, the second prompt information for prompting the phase failure of the three-phase power supply to be detected is output, the motor shutdown module is used for performing shutdown processing on the connected motor to prevent the motor from being damaged. In conclusion, whether the phase-lack and the phase-reversal of the three-phase power supply to be detected can be determined by detecting the first electric signal and the second electric signal formed by rectifying the first phase current, the second phase current and the third phase current of the three-phase power supply to be detected through the electric control board, and the phase-lack and the phase-reversal of the three-phase power supply to be detected do not need to be detected manually, so that the cost of the phase-lack and the phase-reversal of the three-phase power supply to be detected can be reduced, the time for detecting the phase-lack and the phase-reversal of the three-phase power supply to be detected can be shortened, and the efficiency for detecting the phase-lack and the phase-reversal of the three-phase power supply to be detected is improved.
In an embodiment of the present invention, the open-phase and reverse-phase protection device for a three-phase power supply further includes: an information determination module;
the information determining module is configured to determine, according to a period of a first phase current, a second phase current and a third phase current output by a three-phase power supply to which three phase lines are normally connected, a time point when a rising edge of a third electrical signal output by a first end of the electronic control board arrives and a first time interval between a time point when a rising edge of a fourth electrical signal output by a second end of the electronic control board arrives, where the third electrical signal is a signal obtained by rectifying the first phase current and the second phase current output by the three-phase power supply to which the three phase lines are normally connected by the electronic control board, and the fourth electrical signal is a signal obtained by rectifying the second phase current and the third phase current output by the three-phase power supply to which the three phase lines are normally connected by the electronic control board;
the signal detection module is used for starting timing when the rising edge of the first electric signal is detected to arrive;
stopping timing when the rising edge of the second electric signal arrives, and taking the timing duration as a second time interval between the time point when the rising edge of the first electric signal arrives and the time point when the rising edge of the second electric signal arrives;
and determining whether the three-phase power supply is in reverse phase according to the first time interval and the second time interval, if so, executing S3, otherwise, executing S4.
In an embodiment of the present invention, the information determining module is configured to determine a first time interval between a time point when a rising edge of the third electrical signal output by the first end of the electrical control board arrives and a time point when a rising edge of the fourth electrical signal output by the second end of the electrical control board arrives according to the following formula:
and S represents the first time interval, and T represents the periods of the first phase current, the second phase current and the third phase current output by the three-phase power supply which is normally connected with the three-phase lines.
In an embodiment of the present invention, the signal detecting module is configured to determine whether a difference between the second time interval and the first time interval is greater than a preset threshold, if so, perform S3, otherwise, perform S4.
In an embodiment of the present invention, the signal detection module is configured to perform:
d1: determining whether the duration of the first electric signal in the same logic level state is greater than at least one period of the first phase current, the second phase current and the third phase current output by the three-phase power supply to be detected, if so, executing S5, otherwise, executing D2;
d2: determining whether the duration of the second electrical signal being in the same logic level state is greater than at least one of the periods, and if so, executing the step S5.
In an embodiment of the present invention, the open-phase and reverse-phase protection device for a three-phase power supply further includes: a power-on detection module;
the power-on detection module is used for determining whether the electric control board connected with the three-phase power supply to be detected loses power or not when the three-phase power supply to be detected is powered on, if so, executing the S5, otherwise, executing the S1.
The embodiments of the invention have at least the following beneficial effects:
1. in an embodiment of the invention, a first electric signal formed by converting a first phase current and a second phase current output by a three-phase power supply to be detected is acquired through an electric control board, and a second electric signal formed by rectifying the second phase current and the third phase current output by the three-phase power supply to be detected is acquired, whether the three-phase power supply to be detected is in a phase failure or a reverse phase can be determined according to the first electric signal and the second electric signal, prompt information for prompting the reverse phase of the three-phase power supply to be detected is output when the three-phase power supply to be detected is in the reverse phase, so that the reverse phase of the three-phase power supply to be detected can be known externally, and second prompt information for prompting the phase failure of the three-phase power supply to be detected is output when the three-phase power supply to be detected is in the phase failure or the reverse phase, and the connected motor is required to be shut down when the three-phase power supply to be detected is in the phase failure or the reverse phase, to prevent damage to the motor. In conclusion, whether the phase-lack and the phase-reversal of the three-phase power supply to be detected can be determined by detecting the first electric signal and the second electric signal formed by rectifying the first phase current, the second phase current and the third phase current of the three-phase power supply to be detected through the electric control board, and the phase-lack and the phase-reversal of the three-phase power supply to be detected do not need to be detected manually, so that the cost of the phase-lack and the phase-reversal of the three-phase power supply to be detected can be reduced, the time for detecting the phase-lack and the phase-reversal of the three-phase power supply to be detected can be shortened, and the efficiency for detecting the phase-lack and the phase-reversal of the three-phase power supply to be detected is improved.
2. In an embodiment of the present invention, a first time interval between a third electrical signal formed by rectifying a first phase current and a second phase current output by a three-phase power supply when a three-phase electric wire is normally connected and a fourth electrical signal formed by rectifying a second phase current and a third phase current output by the three-phase power supply when the three-phase power supply outputs a three-phase alternating current is reached when the three-phase electric wire is normally connected and the electric control board is connected can be determined according to a period of outputting a three-phase alternating current by the three-phase power supply. The timing is started when the rising edge of a first electric signal obtained after rectifying a first phase current and a second phase current of a three-phase power supply to be detected arrives at the electric control board, the timing is stopped when the rising edge of a second electric signal obtained after rectifying the second phase current and the third phase current of the three-phase power supply to be detected arrives at the electric control board, a second time interval between the rising edge of the first electric signal and the rising edge of the second electric signal can be determined, according to the second time interval and the first time interval, whether the anti-phase condition exists in the three-phase power supply to be detected can be determined, the anti-phase condition of the three-phase power supply to be detected does not need to be detected manually, the time for detecting the anti-phase condition of the three-phase power supply to be detected can be shortened, and the efficiency for detecting the anti-phase of the three-phase power is improved.
3. In an embodiment of the present invention, since the first phase current, the second phase current, and the third phase current output by the three-phase power supply with the normally connected three-phase lines are all sine waves, through the above formula, the first time interval between the arrival of the rising edge of the third electrical signal obtained by rectifying the first phase current and the second phase current of the normally connected three-phase power supply through the electrical control board and the arrival of the rising edge of the fourth electrical signal obtained by rectifying the second phase current and the third phase current of the three-phase power supply through the electrical control board can be determined.
4. In an embodiment of the present invention, since there is a delay time in starting timing and a delay time in stopping timing, the sum of the delay times existing in starting timing and stopping timing is used as a preset threshold, for example, 1 millisecond, and it is determined whether the sum of the first time interval and the timed delay time (i.e., the preset threshold) in the case that the rising edge of the second electrical signal arrives and the second time interval in the case that the rising edge of the first electrical signal arrives is greater than the sum of the first time interval and the timed delay time (i.e., the preset threshold) in the case that the rising edge of the second electrical signal arrives and the rising edge of the first electrical signal arrives when the three-phase power source to be detected is normally connected.
5. In an embodiment of the present invention, when the duration of the first electrical signal or the second electrical signal in the high level state or the low level state is longer than at least one period of outputting three-phase power by the three-phase power supply to be detected, it may be determined that the three-phase power supply to be detected has a phase failure condition, and therefore a fault needs to be reported, that is, second prompt information for prompting the phase failure of the three-phase power supply is output, and the motor operation is stopped, so as to prevent the motor from being damaged due to the phase failure of the three-phase power supply to be detected.
6. In an embodiment of the invention, when a certain phase of the three-phase power supply to be detected is out of phase, because the electric control board connected with the phase cannot form a loop, the electric control board is out of power, the motor connected with the electric control board cannot work, and the fault notification can be performed by outputting second prompt information for prompting the phase failure of the three-phase power supply to be detected.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. A three-phase power supply open-phase and reverse-phase protection method is characterized by comprising the following steps:
when the three-phase power supply to be detected is powered on,
s1: acquiring a first electric signal output by a first end of an electric control board and a second electric signal output by a second end of the electric control board, wherein the first electric signal is a signal obtained by rectifying a first phase current and a second phase current output by the three-phase power supply to be detected through the electric control board, and the second electric signal is a signal obtained by rectifying a second phase current and a third phase current output by the three-phase power supply to be detected through the electric control board;
s2: determining whether the three-phase power supply to be detected is in reverse phase or not according to the first electric signal and the second electric signal, if so, executing S3, otherwise, executing S4;
s3: outputting first prompt information for prompting the reverse phase of the three-phase power supply to be detected, and executing S6;
s4: determining whether the three-phase power supply to be detected is in a phase failure state or not according to the first electric signal and the second electric signal, and if so, executing S5;
s5: outputting second prompt information for prompting the phase failure of the three-phase power supply to be detected, and executing S6;
s6: controlling a motor connected with the three-phase power supply to be detected to stop running;
before the S2, further comprising:
determining a first time interval between a time point when a rising edge of a third electric signal output by a first end of the electric control board arrives and a time point when a rising edge of a fourth electric signal output by a second end of the electric control board arrives according to periods of a first phase current, a second phase current and a third phase current output by a three-phase power supply normally connected by three phases, wherein the third electric signal is a signal obtained by rectifying the first phase current and the second phase current output by the three-phase power supply normally connected by the three phases through the electric control board, and the fourth electric signal is a signal obtained by rectifying the second phase current and the third phase current output by the three-phase power supply normally connected by the three phases through the electric control board;
the S2, including:
starting timing when the rising edge of the first electric signal is detected;
stopping timing when the rising edge of the second electric signal arrives, and taking the timing duration as a second time interval between the time point when the rising edge of the first electric signal arrives and the time point when the rising edge of the second electric signal arrives;
determining whether the three-phase power is in reverse phase according to the first time interval and the second time interval, if so, executing S3, otherwise, executing S4;
determining whether the three-phase power is in reverse phase according to the first time interval and the second time interval, if so, executing S3, otherwise, executing S4, including:
determining whether the difference between the second time interval and the first time interval is greater than a preset threshold, if so, performing S3, otherwise, performing S4;
the preset threshold is equal to the sum of the first delay time and the second delay time; the first delay time is a time interval between the arrival of a rising edge of the first electrical signal and the start of timing; the second delay time is a time interval between when a rising edge of the second electric signal arrives and the stop timing.
2. The method for protecting the open-phase and reverse-phase of a three-phase power supply according to claim 1,
the determining a first time interval between a time point when a rising edge of a third electric signal output by the first end of the electric control board arrives and a time point when a rising edge of a fourth electric signal output by the second end of the electric control board arrives according to a cycle of a first phase current, a second phase current and a third phase current output by a three-phase power supply normally connected by three phase lines includes:
determining a first time interval between a time point when a rising edge of a third electric signal output by the first end of the electric control board arrives and a time point when a rising edge of a fourth electric signal output by the second end of the electric control board arrives according to the following formula:
and S represents the first time interval, and T represents the periods of the first phase current, the second phase current and the third phase current output by the three-phase power supply which is normally connected with the three-phase lines.
3. The method for protecting the open-phase and reverse-phase of a three-phase power supply according to claim 1,
the S4, including:
d1: determining whether the duration of the first electric signal in the same logic level state is greater than at least one period of the first phase current, the second phase current and the third phase current output by the three-phase power supply to be detected, if so, executing S5, otherwise, executing D2;
d2: determining whether the duration of the second electrical signal being in the same logic level state is greater than at least one of the periods, and if so, executing the step S5;
and/or the presence of a gas in the gas,
when the three-phase power supply to be detected is powered on,
before the S1, further comprising:
and determining whether the electric control board connected with the three-phase power supply to be detected loses power, if so, executing the step S5, otherwise, executing the step S1.
4. The utility model provides a three-phase power phase failure protection device that reverses phase which characterized in that includes:
and the signal acquisition module is used for executing S1 when the three-phase power supply to be detected is electrified: acquiring a first electric signal output by a first end of an electric control board and a second electric signal output by a second end of the electric control board, wherein the first electric signal is a signal obtained by rectifying a first phase current and a second phase current output by the three-phase power supply to be detected through the electric control board, and the second electric signal is a signal obtained by rectifying a second phase current and a third phase current output by the three-phase power supply to be detected through the electric control board;
a signal detection module for performing S2: determining whether the three-phase power supply to be detected is in a reverse phase according to the first electric signal and the second electric signal acquired by the signal acquisition module, and if so, triggering an information output module to execute S3: outputting first prompt information for prompting the reverse phase of the three-phase power supply to be detected, and triggering a motor stopping module; otherwise, go to S4; s4: determining whether the three-phase power supply to be detected is open-phase or not according to the first electric signal and the second electric signal, if so, executing S5 by the information output module: outputting second prompt information for prompting the phase failure of the three-phase power supply to be detected, and triggering the motor stopping module;
the motor stopping module is used for executing S6: controlling a motor connected with the three-phase power supply to be detected to stop running;
further comprising: an information determination module;
the information determining module is configured to determine, according to a period of a first phase current, a second phase current and a third phase current output by a three-phase power supply to which three phase lines are normally connected, a time point when a rising edge of a third electrical signal output by a first end of the electronic control board arrives and a first time interval between a time point when a rising edge of a fourth electrical signal output by a second end of the electronic control board arrives, where the third electrical signal is a signal obtained by rectifying the first phase current and the second phase current output by the three-phase power supply to which the three phase lines are normally connected by the electronic control board, and the fourth electrical signal is a signal obtained by rectifying the second phase current and the third phase current output by the three-phase power supply to which the three phase lines are normally connected by the electronic control board;
the signal detection module is used for starting timing when the rising edge of the first electric signal is detected to arrive;
stopping timing when the rising edge of the second electric signal arrives, and taking the timing duration as a second time interval between the time point when the rising edge of the first electric signal arrives and the time point when the rising edge of the second electric signal arrives;
determining whether the three-phase power is in reverse phase according to the first time interval and the second time interval, if so, executing S3, otherwise, executing S4;
the signal detection module is used for determining whether the difference between the second time interval and the first time interval is greater than a preset threshold, if so, executing S3, otherwise, executing S4;
the preset threshold is equal to the sum of the first delay time and the second delay time; the first delay time is a time interval between the arrival of a rising edge of the first electrical signal and the start of timing; the second delay time is a time interval between when a rising edge of the second electric signal arrives and the stop timing.
5. The open-phase and reverse-phase protection device of claim 4,
the information determining module is used for determining a first time interval between a time point when a rising edge of a third electric signal output by the first end of the electric control board arrives and a time point when a rising edge of a fourth electric signal output by the second end of the electric control board arrives according to the following formula:
and S represents the first time interval, and T represents the periods of the first phase current, the second phase current and the third phase current output by the three-phase power supply which is normally connected with the three-phase lines.
6. The open-phase and reverse-phase protection device for three-phase power supply according to any one of claims 4 to 5,
the signal detection module is configured to perform:
d1: determining whether the duration of the first electric signal in the same logic level state is greater than at least one period of the first phase current, the second phase current and the third phase current output by the three-phase power supply to be detected, if so, executing S5, otherwise, executing D2;
d2: determining whether the duration of the second electrical signal being in the same logic level state is greater than at least one of the periods, and if so, executing the step S5;
and/or the presence of a gas in the gas,
the open-phase and reverse-phase protection device for the three-phase power supply further comprises: a power-on detection module;
the power-on detection module is used for determining whether the electric control board connected with the three-phase power supply to be detected loses power or not when the three-phase power supply to be detected is powered on, if so, executing the S5, otherwise, executing the S1.
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| CN110098595A (en) | 2019-08-06 |
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