CN113534005A - Electric leakage detection method of cleaning machine - Google Patents
Electric leakage detection method of cleaning machine Download PDFInfo
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- CN113534005A CN113534005A CN202110701121.9A CN202110701121A CN113534005A CN 113534005 A CN113534005 A CN 113534005A CN 202110701121 A CN202110701121 A CN 202110701121A CN 113534005 A CN113534005 A CN 113534005A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/55—Testing for incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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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
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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)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a leakage detection method of a cleaning machine, wherein a zero line and a live line of a power supply of the cleaning machine are respectively connected with a leakage detection circuit; detecting and acquiring a first detection waveform of a leakage detection circuit connected to a zero line; detecting and acquiring a second detection waveform of a leakage detection circuit connected to the live wire; calculating a duty ratio A of low and high levels in the first detection waveform, and calculating a duty ratio B of low and high levels in the second detection waveform; a, B is compared with preset low and high level duty ratio reference values corresponding to different connection conditions of the zero line, the live line and the ground line and whether the electric leakage state exists under different connection conditions, so as to determine whether the zero line and the live line are reversely connected in the cleaning process, whether the ground line is connected and whether the electric leakage condition exists. The electric leakage detection method of the cleaning machine can effectively identify the situations that the zero line and the live line are in positive and negative connection, the ground line is connected or not and the electric leakage occurs or not.
Description
Technical Field
The invention relates to a leakage detection method of a cleaning machine.
Background
In the current market, aiming at the electric leakage protection of the cleaning machine, an electric leakage detection circuit is mainly added on a zero line, and then whether the cleaning machine is in an electric leakage state or not is identified through software. The present electric leakage detection scheme can't effectual reversal condition of detecting the zero live wire usually, can carry out the electric leakage warning to the zero live wire reversal, but in the cleaning machine is used, the cleaning machine still can normally work when the zero live wire reversal, need not to carry out the electric leakage warning under this condition, so then can lead to because of the zero live wire reversal leakage trouble that causes is too much, has improved the maintenance rate of product, has increased product cost of maintenance. In addition, under the condition that the ground wire of the cleaning machine is disconnected or damaged, effective identification cannot be carried out, and certain potential safety hazards exist in the use of the cleaning machine.
Disclosure of Invention
The invention aims to solve the technical problem of providing a leakage detection method of a cleaning machine, which can effectively identify the situations of positive and negative connection of zero and live wires, connection of ground wires and leakage of electricity.
The technical scheme adopted by the invention for solving the technical problems is as follows: a leakage detection method of a cleaning machine is characterized in that: the zero line and the live line of the power supply of the cleaning machine are respectively connected with a leakage detection circuit;
detecting and acquiring a first detection waveform of a leakage detection circuit connected to a zero line;
detecting and acquiring a second detection waveform of a leakage detection circuit connected to the live wire;
calculating a duty ratio A of low and high levels in the first detection waveform, and calculating a duty ratio B of low and high levels in the second detection waveform;
a, B is compared with preset low and high level duty ratio reference values corresponding to different connection conditions of the zero line, the live line and the ground line and whether the electric leakage state exists under different connection conditions, so as to determine whether the zero line and the live line are reversely connected in the cleaning process, whether the ground line is connected and whether the electric leakage condition exists.
Preferably, the preset reference values of the duty cycle ratios of the low level and the high level corresponding to the different connection conditions of the zero line, the live line and the ground line and whether the leakage state exists under the different connection conditions include the following steps:
when the zero live wire is normally connected, the ground wire is normally connected and no electric leakage occurs, the first detection waveform is a continuous high level, and the duty ratio reference values of the low level and the high level corresponding to the first detection waveform are 0; the second detection waveform is a high-low level waveform with periodic variation, and the duty ratio reference value of the low level and the high level in the corresponding second waveform is P1;
when the zero live wire is reversely connected, the ground wire is normally connected and no electric leakage occurs, the second detection waveform is a continuous high level, and the duty ratio reference values of the low level and the high level corresponding to the second detection waveform are 0; the first detection waveform is a high-low level waveform with periodic variation, and the duty ratio reference value of the low and high levels in the corresponding first waveform is P1;
when the zero live wire is normally connected, the ground wire is not connected or damaged and no electric leakage occurs, the first detection waveform is a continuous high level, and the duty ratio reference values of the low level and the high level corresponding to the first detection waveform are 0; the second detection waveform is a high-low level waveform with periodic variation, and the low-high level duty ratio reference value in the corresponding second waveform is P2 different from P1;
when the zero live wire is reversely connected, the ground wire is not connected or damaged and no electric leakage occurs, the second detection waveform is a continuous high level, and the duty ratio reference values of the low level and the high level corresponding to the second detection waveform are 0; the first detection waveform is a high-low level waveform with periodic variation, and the low-high level duty ratio reference value in the corresponding first waveform is P2 different from P1;
under the condition of electric leakage, the first detection waveform and the second detection waveform are both non-continuous high levels, and the duty ratio reference values of the low level and the high level corresponding to the first detection waveform are both non-0 data;
when A =0 and B = P1, judging that the zero live wire is normally connected, the ground wire is normally connected and no electric leakage occurs;
when A = P1 and B =0, judging that the zero live wire is reversely connected, the ground wire is normally connected and no electric leakage occurs;
when A =0 and B ≠ P1, judging that the zero live wire is normally connected, the ground wire is not connected or damaged, and no electric leakage occurs;
when A is not equal to P1 and B =0, judging that the zero live wire is reversely connected, the ground wire is not connected or damaged and no electric leakage occurs;
and when A is not equal to 0 and B is not equal to 0, judging the condition of electric leakage, and correspondingly performing electric leakage alarm.
Further, for the case where leakage occurs:
when the leakage occurs under the condition of being connected with a ground wire, the first detection waveform and the second detection waveform are both continuous low levels, the duty ratio reference values of the low level and the high level corresponding to the first detection waveform are 1, and the duty ratio reference values of the low level and the high level corresponding to the second detection waveform are 1;
when the electricity leakage condition occurs under the condition that the ground wire is not connected, the first detection waveform and the second detection waveform are both high-low level waveforms which change periodically, the low-level duty ratio reference value and the high-level duty ratio reference value corresponding to the corresponding first detection waveform are P3 which is different from P1 and P2, and the low-level duty ratio reference value and the high-level duty ratio reference value corresponding to the corresponding second detection waveform are P4 which is different from P1 and P2;
when A = B =1, judging that the electric leakage condition occurs under the condition of connecting the ground wire, and performing electric leakage alarm at the moment;
when A = P3 and B = P4, it is determined that leakage occurs when the ground wire is not connected, and at this time, a leakage alarm is performed and a ground wire missing alarm is performed.
Preferably, under the condition of no electric leakage, if the situation that the zero line and the live line are reversely connected and the ground line is normally connected is judged, no fault alarm is carried out; and if the ground wire is judged to be not connected or damaged, whether ground wire fault alarm is carried out is set according to the requirement.
Compared with the prior art, the invention has the advantages that: the electric leakage detection method of the cleaning machine can completely identify the fault condition caused by the reverse connection of the zero line and the live line or the non-connection of the ground line, and further set alarm modes of different conditions according to requirements, for example, the alarm can not be carried out under the condition that only the reverse connection of the zero line and the live line is carried out but not the fault is reported necessarily, the report rate in the aspect of electric leakage faults is reduced to the maximum extent, and the maintenance rate of the whole machine is reduced. In addition, the electric leakage detection method of the cleaning machine can still accurately identify the electric leakage condition and report the electric leakage fault under the condition that the ground wires are not connected or damaged, and simultaneously remind a user that the ground wires are not connected, so that the potential safety use hazard of the user is reduced.
Drawings
Fig. 1 is a flowchart of a leakage detecting method of a cleaning machine according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The leakage detection circuit in the "leakage fault detection circuit" of the chinese utility model patent with the publication number CN207764355U can be utilized to connect the leakage detection circuit to the zero line and the live line of the power supply of the cleaning machine, so as to detect the leakage condition.
According to the experimental test, the detection waveforms are different according to different wiring conditions and electric leakage conditions, and according to the experimental result, whether the electric leakage state corresponds to the low and high level duty cycle ratio reference values under different connection conditions of the zero line, the live line and the ground line and different connection conditions can be preset, and the specific experimental result is as follows.
When the zero live wire is normally connected, the ground wire is normally connected and no electric leakage occurs, the first detection waveform is a continuous high level, and duty ratio reference values of low and high levels corresponding to the first detection waveform are correspondingly preset to be 0; the second detection waveform is a high-low level waveform with periodic variation, and the duty ratio of low and high level in the corresponding second waveform is P1, and the reference value of low and high level duty ratio in the corresponding preset second waveform is P1.
When the zero live wire is reversely connected, the ground wire is normally connected and no electric leakage occurs, the second detection waveform is a continuous high level, and the duty ratio reference values of the low level and the high level corresponding to the second detection waveform are correspondingly preset to be 0; the first detection waveform is a high-low level waveform with periodic variation, the duty ratio of the low and high level in the corresponding first waveform is P1, and the reference value of the duty ratio of the low and high level in the corresponding preset first waveform is P1.
When the zero live wire is normally connected, the ground wire is not connected or damaged and no electric leakage occurs, the first detection waveform is a continuous high level, and the duty ratio reference values of the low level and the high level corresponding to the first detection waveform are 0; the second detection waveform is a high-low level waveform with a period varying, and the duty ratio of the low and high level in the corresponding second waveform is P2 different from P1, and the reference value of the duty ratio of the low and high level in the corresponding second waveform is preset to be P2.
When the zero live wire is reversely connected, the ground wire is not connected or damaged and no electric leakage occurs, the second detection waveform is a continuous high level, and the duty ratio reference values of the low level and the high level corresponding to the second detection waveform are correspondingly preset to be 0; the first detection waveform is a high-low level waveform with periodic variation, and the duty ratio of low and high level in the corresponding first waveform is P2 different from P1, and the reference value of low and high level duty ratio in the corresponding preset first waveform is P2.
Under the condition of electric leakage, the first detection waveform and the second detection waveform are both non-continuous high levels, and the duty ratio reference values of the low level and the high level corresponding to the corresponding preset first detection waveform are both non-0 data.
For the case where the electric leakage occurs, the following is specifically made.
When the leakage occurs under the condition of being connected with a ground wire, the first detection waveform and the second detection waveform are both continuous low levels, the duty ratio reference values of the low level and the high level corresponding to the first detection waveform are correspondingly preset to be 1, and the duty ratio reference values of the low level and the high level corresponding to the second detection waveform are preset to be 1.
When the electricity leakage occurs under the condition that the ground wire is not connected, the first detection waveform and the second detection waveform are both high-low level waveforms which are periodically changed, the duty ratio of the low level and the high level corresponding to the first detection waveform is P3 which is different from P1 and P2, and the duty ratio of the low level and the high level corresponding to the second detection waveform is P4 which is different from P1 and P2. The low and high duty cycle reference values corresponding to the first detection waveform are preset to P3, and the low and high duty cycle reference values corresponding to the second detection waveform are preset to P4. In this case, the specific data of P3 and P4 corresponding to the normal connection and the reverse connection of the zero fire line are exchanged.
As shown in FIG. 1, the method for detecting the electric leakage of the cleaning machine comprises the following steps.
And S1, detecting and acquiring a first detection waveform of the leakage detection circuit connected to the zero line.
And S2, detecting and acquiring a second detection waveform of the leakage detection circuit connected to the live wire.
S3, a duty ratio a of low and high levels in the first detected waveform is calculated, and a duty ratio B of low and high levels in the second detected waveform is calculated.
S4, comparing A, B with preset low and high level duty ratio reference values corresponding to different connection conditions of the zero line, the live line and the ground line and whether the electric leakage state exists under different connection conditions, and further determining whether the zero line and the live line are reversely connected in the cleaning process, whether the ground line is connected and whether the electric leakage condition exists.
Specifically, when a =0 and B = P1, it is determined that the zero live wire is normally connected, the ground wire is normally connected, and no leakage occurs, and at this time, no leakage fault alarm is performed.
When A = P1 and B =0, the zero live wire is judged to be reversely connected, the ground wire is normally connected and no electric leakage occurs, the reverse connection of the zero live wire has no influence on the normal operation of the cleaning machine, the electric leakage fault alarm is not carried out at the moment, and only the reverse connection condition of the zero live wire is recorded so as to be provided for the places needing the information for use.
When a =0 and B ≠ P1, it is generally the case of a =0 and B = P2, it is determined that the zero-fire wire is normally connected, the ground wire is not connected or broken, and no leakage occurs.
When a ≠ P1 and B =0, and usually when a = P2 and B =0, it is determined that the zero-live wire is reversely connected, the ground wire is not connected or damaged, and no electric leakage occurs, and the recording is also performed for the case of the zero-live wire reverse connection at this time.
And when A is not equal to 0 and B is not equal to 0, judging the condition of electric leakage, and correspondingly performing electric leakage alarm.
In the case where the leakage occurs, in order to effectively determine the ground connection at that time, the following two types of determination can be specifically made.
1) When A = B =1, judging that the electric leakage condition occurs under the condition of connecting the ground wire, and performing electric leakage alarm at the moment;
2) when A = P3 and B = P4, it is determined that leakage occurs when the ground wire is not connected, and at this time, a leakage alarm is performed and a ground wire missing alarm is performed. And judging the connection condition of the zero-live wire according to the specific data of P3 and P4.
When the ground wire is not connected or damaged, potential safety hazards exist, whether ground wire fault alarming is carried out or not can be set according to requirements under the condition that the ground wire is not connected or damaged under the condition that electricity is not leaked, and the ground wire fault alarming can be usually selected to be carried out so as to ensure the use safety of the cleaning machine.
The electric leakage detection method of the cleaning machine can completely identify the fault condition caused by the reverse connection of the zero line and the live line or the non-connection of the ground line, and further set alarm modes of different conditions according to requirements, for example, the alarm can not be carried out under the condition that only the reverse connection of the zero line and the live line is carried out but not the fault is reported necessarily, the report rate in the aspect of electric leakage faults is reduced to the maximum extent, and the maintenance rate of the whole machine is reduced. In addition, the electric leakage detection method of the cleaning machine can still accurately identify the electric leakage condition and report the electric leakage fault under the condition that the ground wires are not connected or damaged, and simultaneously remind a user that the ground wires are not connected, so that the potential safety use hazard of the user is reduced.
Claims (4)
1. A leakage detection method of a cleaning machine is characterized in that: the zero line and the live line of the power supply of the cleaning machine are respectively connected with a leakage detection circuit;
detecting and acquiring a first detection waveform of a leakage detection circuit connected to a zero line;
detecting and acquiring a second detection waveform of a leakage detection circuit connected to the live wire;
calculating a duty ratio A of low and high levels in the first detection waveform, and calculating a duty ratio B of low and high levels in the second detection waveform;
a, B is compared with preset low and high level duty ratio reference values corresponding to different connection conditions of the zero line, the live line and the ground line and whether the electric leakage state exists under different connection conditions, so as to determine whether the zero line and the live line are reversely connected in the cleaning process, whether the ground line is connected and whether the electric leakage condition exists.
2. A leakage detecting method for a washing machine according to claim 1, characterized in that: the preset reference values of the duty cycle ratios of low and high levels corresponding to the leakage states of different connection conditions of the zero line, the live line and the ground line and different connection conditions comprise the following steps:
when the zero live wire is normally connected, the ground wire is normally connected and no electric leakage occurs, the first detection waveform is a continuous high level, and the duty ratio reference values of the low level and the high level corresponding to the first detection waveform are 0; the second detection waveform is a high-low level waveform with periodic variation, and the duty ratio reference value of the low level and the high level in the corresponding second waveform is P1;
when the zero live wire is reversely connected, the ground wire is normally connected and no electric leakage occurs, the second detection waveform is a continuous high level, and the duty ratio reference values of the low level and the high level corresponding to the second detection waveform are 0; the first detection waveform is a high-low level waveform with periodic variation, and the duty ratio reference value of the low and high levels in the corresponding first waveform is P1;
when the zero live wire is normally connected, the ground wire is not connected or damaged and no electric leakage occurs, the first detection waveform is a continuous high level, and the duty ratio reference values of the low level and the high level corresponding to the first detection waveform are 0; the second detection waveform is a high-low level waveform with periodic variation, and the low-high level duty ratio reference value in the corresponding second waveform is P2 different from P1;
when the zero live wire is reversely connected, the ground wire is not connected or damaged and no electric leakage occurs, the second detection waveform is a continuous high level, and the duty ratio reference values of the low level and the high level corresponding to the second detection waveform are 0; the first detection waveform is a high-low level waveform with periodic variation, and the low-high level duty ratio reference value in the corresponding first waveform is P2 different from P1;
under the condition of electric leakage, the first detection waveform and the second detection waveform are both non-continuous high levels, and the duty ratio reference values of the low level and the high level corresponding to the first detection waveform are both non-0 data;
when A =0 and B = P1, judging that the zero live wire is normally connected, the ground wire is normally connected and no electric leakage occurs;
when A = P1 and B =0, judging that the zero live wire is reversely connected, the ground wire is normally connected and no electric leakage occurs;
when A =0 and B ≠ P1, judging that the zero live wire is normally connected, the ground wire is not connected or damaged, and no electric leakage occurs;
when A is not equal to P1 and B =0, judging that the zero live wire is reversely connected, the ground wire is not connected or damaged and no electric leakage occurs;
and when A is not equal to 0 and B is not equal to 0, judging the condition of electric leakage, and correspondingly performing electric leakage alarm.
3. A leakage detecting method of a washing machine according to claim 2, characterized in that: for the case of leakage:
when the leakage occurs under the condition of being connected with a ground wire, the first detection waveform and the second detection waveform are both continuous low levels, the duty ratio reference values of the low level and the high level corresponding to the first detection waveform are 1, and the duty ratio reference values of the low level and the high level corresponding to the second detection waveform are 1;
when the electricity leakage condition occurs under the condition that the ground wire is not connected, the first detection waveform and the second detection waveform are both high-low level waveforms which change periodically, the low-level duty ratio reference value and the high-level duty ratio reference value corresponding to the corresponding first detection waveform are P3 which is different from P1 and P2, and the low-level duty ratio reference value and the high-level duty ratio reference value corresponding to the corresponding second detection waveform are P4 which is different from P1 and P2;
when A = B =1, judging that the electric leakage condition occurs under the condition of connecting the ground wire, and performing electric leakage alarm at the moment;
when A = P3 and B = P4, it is determined that leakage occurs when the ground wire is not connected, and at this time, a leakage alarm is performed and a ground wire missing alarm is performed.
4. A leakage detecting method of a washing machine according to claim 2 or 3, characterized in that: under the condition of no electric leakage, if the situation that the zero line and the live line are reversely connected and the ground line is normally connected is judged, no fault alarm is carried out; and if the ground wire is judged to be not connected or damaged, whether ground wire fault alarm is carried out is set according to the requirement.
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