CN113567881B - Working method for reducing false alarm of electric leakage fault of cleaning machine - Google Patents
Working method for reducing false alarm of electric leakage fault of cleaning machine Download PDFInfo
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- CN113567881B CN113567881B CN202110701108.3A CN202110701108A CN113567881B CN 113567881 B CN113567881 B CN 113567881B CN 202110701108 A CN202110701108 A CN 202110701108A CN 113567881 B CN113567881 B CN 113567881B
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- cleaning machine
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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
- G01R31/56—Testing of electric apparatus
-
- 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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- Physics & Mathematics (AREA)
- 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 working method for reducing false alarm of electric leakage fault of a cleaning machine, which comprises the following steps of acquiring the detection waveform of an electric leakage detection circuit connected to a power supply zero line of the cleaning machine when the cleaning machine is just powered on; calculating the duty ratio P of low and high levels in the detection waveform; determining whether the zero line and the live line are reversely connected and whether the ground line is connected according to the reference values of the duty cycle ratios of the low level and the high level corresponding to different connection conditions of the P and the preset zero line, the live line and the ground line; in the subsequent use process of the cleaning machine, the detection waveform of an electric leakage detection circuit connected to a power supply zero line of the cleaning machine is obtained, the duty time ratio A of low and high levels in the detection waveform is calculated, whether A changes relative to P or not is judged, if yes, an electric leakage fault alarm is carried out, and if not, normal work is continued. The working method for reducing the false alarm of the electric leakage fault of the cleaning machine reduces unnecessary maintenance rate.
Description
Technical Field
The invention relates to the technical field of cleaning machines, in particular to a working method for reducing the false alarm and leakage faults of a cleaning machine.
Background
At present, in the market, for the electric leakage protection of a water tank dish washing machine, an electric leakage detection circuit is mainly added on a zero line, and then whether a washing machine is in an electric leakage state or not is identified through software. The current leakage detection scheme can carry out electric leakage alarm for zero-live wire reverse connection usually, but in the cleaning machine application, the cleaning machine still can normally work when zero-live wire reverse connection, need not to carry out electric leakage alarm under this condition, so then can lead to because of the electric leakage trouble that zero-live wire reverse connection caused too much, improved the maintenance rate of product, increased product cost of maintenance. In addition, the ground wire of the cleaning machine cannot be effectively identified under the condition that the ground wire is disconnected or the ground wire is damaged, so that 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 working method for reducing the false alarm leakage fault of the cleaning machine, which can effectively identify the reverse connection condition of the zero line and the live line, can effectively identify the condition that the ground line is not connected or the ground line is damaged, and can reduce the false alarm leakage under the condition that only the zero line and the live line are reversely connected.
The technical scheme adopted by the invention for solving the problems is as follows: a working method for reducing false alarm of electric leakage fault of a cleaning machine is characterized by comprising the following steps: comprises the following steps
When the cleaning machine is just powered on, acquiring a detection waveform of a leakage detection circuit connected to a power supply zero line of the cleaning machine;
calculating the duty ratio P of low and high levels in the detection waveform;
determining whether the zero line and the live line are reversely connected and whether the ground line is connected according to the reference values of the duty cycle ratios of the low level and the high level corresponding to different connection conditions of the P and the preset zero line, the live line and the ground line;
in the subsequent use process of the cleaning machine, the detection waveform of the leakage detection circuit connected to the power supply zero line of the cleaning machine is obtained, the duty ratio A of low and high levels in the detection waveform is calculated, whether A changes relative to P is judged, leakage fault alarm is carried out if A changes, and normal operation is continued if not.
Preferably, the preset low and high level duty cycle reference values corresponding to different connection conditions of the zero line, the live line and the ground line include the following:
when the zero live wire is normally connected, the detection waveform is a continuous high level, the duty ratio reference values of the low level and the high level corresponding to the condition are P1, and P1=0;
when the zero line and the live line are reversely connected and the ground line is normally connected, the 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 corresponding to the condition is P2;
when the zero live wire is reversely connected and the ground wire is not connected or damaged, the detection waveform is a high-low level waveform which changes periodically, and the corresponding low-high level duty ratio reference value is P3;
when P = P1, judging that the zero line and the fire line are normally connected, and recording the information;
when P = P2, judging that the zero live wire is reversely connected and the ground wire is normally connected, and recording the information;
when P = P3, it is judged that the zero wire is reversely connected and the ground wire is not connected or damaged, and the information is recorded.
As an improvement, the relationship between P2 and P3 is: p2 > P3.
In order to reduce the electric leakage false alarm under the condition of not influencing the working condition of the cleaning machine, when the zero line and the live line are reversely connected and the ground line is normally connected, the electric leakage fault alarm is not carried out;
and when the zero line and the live line are reversely connected and the ground line is not connected or damaged, whether leakage fault alarm is carried out or not is set according to requirements.
In order to ensure that the wiring of the cleaning machine is in a normal connection state during electrification and further accurately determine the electric leakage condition of the cleaning machine in the subsequent use process of the cleaning machine, when the cleaning machine is in a self-locking state before electrification, a technician energizes the cleaning machine, a self-checking program in the cleaning machine is matched with the technician to check and complete the electric leakage check work of the cleaning machine, and after the zero line, the live line and the ground line of the cleaning machine are normally connected, the technician sets the cleaning machine in an unlocking state and electrifys the cleaning machine again.
As an improvement, the cleaning machine is set to be in a self-locking state just before delivery and installation.
As an improvement, the cleaning machine is automatically set to be in a self-locking state when an electric leakage fault alarm is carried out.
Compared with the prior art, the invention has the advantages that: according to the working method for reducing the false alarm leakage fault of the cleaning machine, the conditions of whether the zero line and the live line are reversely connected and whether the ground line is connected can be judged through the difference of the detection waveforms of the leakage detection circuit, so that the false alarm leakage can be avoided when the cleaning machine can normally work under the condition that the zero line and the live line are reversely connected and have no leakage, and the unnecessary maintenance rate is reduced. Meanwhile, the electric leakage condition can be accurately found, and the use safety of the cleaning machine is ensured.
Drawings
Fig. 1 is a flowchart of a working method for reducing a false alarm leakage fault 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 working method for reducing the false alarm of the leakage fault of the cleaning machine in the embodiment can utilize the leakage detection circuit in the chinese utility model patent "a detection circuit for leakage fault" with the publication number of CN207764355U, and connect the leakage detection circuit on the zero 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 for different wiring conditions and leakage conditions, so that the following results can be obtained.
1) And under the condition that the zero live wire is normally connected and no electric leakage occurs, the electric leakage detection circuit can output a continuous high-level signal.
2) For the case of reverse connection of zero and live wires, the detection circuit will output periodic high and low level signals, and the duty ratio of low and high levels in the case of ground wire connection and ground wire disconnection will be different.
In the present embodiment, for 1) the case where the detection waveform is continuously high when the zero-fire line is normally connected, the duty ratio of the low and high levels corresponding to this case is P1, and P1=0.
In the case of 2), when the zero line and the ground line are connected in reverse and the ground line is connected normally, the detected waveform is a high-low level waveform that changes periodically, and the duty ratio of the corresponding low level and high level is P2. When the zero live wire is reversely connected and the ground wire is not connected or damaged, the detection waveform is a high-low level waveform which changes periodically, and the corresponding low-high level duty ratio of the condition is P3.
Therefore, the duty ratio of the low level and the high level of the P1, the P2 and the P3 for different wiring conditions are prestored for judgment, and further, the reference values of the duty ratio of the low level and the high level for different wiring conditions are formed. In this example, P2 > P3.
The cleaning machine is usually powered on during initial installation or after being overhauled by a maintainer, so that the cleaning machine is usually powered on without electricity leakage.
Based on the above, as shown in fig. 1, the working method for reducing the false alarm leakage fault of the cleaning machine in the present application includes the following steps.
And S0, setting the state of the cleaning machine just before delivery and installation as a self-locking state as required. When the cleaning machine carries out electric leakage fault alarm, the state of the cleaning machine is automatically set to be a self-locking state.
Thus, when the washer is in a self-locking state before being powered up, a technician is usually required to check for electrical leakage at the door for the user. During the inspection, a technician powers on the cleaning machine, and the self-checking program in the cleaning machine is matched with the technician to complete the electric leakage inspection work of the cleaning machine, and the process can be carried out by adopting various electric leakage condition detection schemes in the prior art. And after the technician determines that the zero line, the live line and the ground wire of the cleaning machine are normally connected, the technician sets the cleaning machine to be in an unlocking state and powers on the cleaning machine again.
S1, when the cleaning machine is just powered on, a detection waveform of a leakage detection circuit connected to a power supply zero line of the cleaning machine is obtained.
And S2, calculating the duty ratio P of low and high levels in the detection waveform.
And S3, determining whether the zero line and the live line are reversely connected and whether the ground line is connected according to the reference values of the duty ratio of the low level and the high level corresponding to the different connection conditions of the P and the preset zero line, the live line and the ground line.
Specifically, when P = P1, it is judged that the zero fire line is normally connected, and this information is recorded.
When P = P2, judging that the zero live wire is reversely connected and the ground wire is normally connected, and recording the information; when the zero line and the live line are reversely connected and the ground line is normally connected, because the normal use of the cleaning machine is not influenced, the electric leakage fault alarm can not be carried out at the moment, so that the unnecessary electric leakage alarm quantity can be reduced, and the unnecessary maintenance rate of the cleaning machine is reduced.
When P = P3, it is judged that the zero wire is reversely connected and the ground wire is not connected or damaged, and the information is recorded. When the zero live wire is reversely connected and the ground wire is not connected or damaged, and when the live wire does not leak electricity to the ground, whether leakage fault alarm is carried out or not can be set according to requirements. In the case of a high safety requirement, this situation may be set as an alarm situation.
When P is aligned with P1, P2, and P3, if the error of P with respect to P1 is within the set first error e1, let P = P1. Let P = P2 if the error of P with respect to P2 is within the set second error e 2. Let P = P3 if the error of P with respect to P3 is within the set third error e3 range.
And S4, in the subsequent use process of the cleaning machine, acquiring the detection waveform of the electric leakage detection circuit connected to the power supply zero line of the cleaning machine, calculating the duty ratio A of low and high levels in the detection waveform, judging whether the A changes relative to the P, performing electric leakage fault alarm if the A changes, and continuing normal operation if the A does not change.
If the cleaning machine is just powered on, and P = P1, judging whether A changes relative to P1 in the subsequent using process of the cleaning machine, if so, judging that the electric leakage occurs under the condition that the zero live wire is normally connected, and at the moment, performing electric leakage fault alarm.
If the cleaning machine is just powered on, P = P2, whether A changes relative to P2 is judged in the subsequent use process of the cleaning machine, if so, the situation of electric leakage is judged under the situation that the zero live wire is normally connected, and at the moment, electric leakage fault alarm is carried out.
If the cleaning machine is just powered on, and P = P3, judging whether A changes relative to P3 in the subsequent using process of the cleaning machine, if so, judging that the electric leakage occurs under the condition that the zero live wire is normally connected, and at the moment, performing electric leakage fault alarm.
According to the working method for reducing the false alarm leakage fault of the cleaning machine, the conditions of whether the zero line and the live line are reversely connected and whether the ground line is connected can be judged through the difference of the detection waveforms of the leakage detection circuit, so that the false alarm leakage can be avoided when the cleaning machine can normally work under the condition that the zero line and the live line are reversely connected and have no leakage, and the unnecessary maintenance rate is reduced. Meanwhile, the electric leakage condition can be accurately found, and the use safety of the cleaning machine is ensured.
Claims (6)
1. A working method for reducing false alarm leakage faults of a cleaning machine is characterized by comprising the following steps: comprises the following steps
When the cleaning machine is just powered on, acquiring a detection waveform of a leakage detection circuit connected to a power supply zero line of the cleaning machine;
calculating the duty ratio P of low and high levels in the detection waveform;
determining whether the zero line and the live line are reversely connected and whether the ground line is connected according to the reference values of the duty cycle ratios of the low level and the high level corresponding to different connection conditions of the P and the preset zero line, the live line and the ground line;
in the subsequent use process of the cleaning machine, acquiring the detection waveform of an electric leakage detection circuit connected on a power supply zero line of the cleaning machine, calculating the duty cycle ratio A of low and high levels in the detection waveform, judging whether the A changes relative to the P, performing electric leakage fault alarm if the A changes, and continuing normal work if the A does not change;
when the zero line and the live line are reversely connected and the ground line is normally connected, no leakage fault alarm is carried out;
and when the zero line and the live line are reversely connected and the ground line is not connected or damaged, whether leakage fault alarm is carried out or not is set according to requirements.
2. The operating method for reducing false alarm leakage faults of a cleaning machine according to claim 1, characterized by comprising the following steps: the preset low and high level duty cycle ratio reference values corresponding to different connection conditions of the zero line, the live line and the ground line comprise the following steps:
when the zero live wire is normally connected, the detection waveform is a continuous high level, the duty ratio reference values of the low level and the high level corresponding to the condition are P1, and P1=0;
when the zero live wire is reversely connected and the ground wire is normally connected, the 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 corresponding to the condition is P2;
when the zero line and the live line are reversely connected and the ground line is not connected or damaged, the detection waveform is a high-low level waveform which changes periodically, and the duty ratio reference value of the corresponding low level and the high level is P3;
when P = P1, judging that the zero fire wire is normally connected, and recording the information;
when P = P2, judging that the zero live wire is reversely connected and the ground wire is normally connected, and recording the information;
when P = P3, it is judged that the zero wire is reversely connected and the ground wire is not connected or damaged, and the information is recorded.
3. The operating method for reducing the false alarm leakage fault of the cleaning machine according to claim 2, characterized in that: the relationship between P2 and P3 is: p2 > P3.
4. The operating method for reducing the false alarm leakage fault of the cleaning machine according to any one of claims 1 to 3, wherein: when the cleaning machine is in a self-locking state before being electrified, a technician powers on the cleaning machine, a self-checking program in the cleaning machine is matched with the technician to check to finish the electric leakage check work of the cleaning machine, and after a zero line, a live line and a ground wire of the cleaning machine are normally connected, the technician sets the cleaning machine to be in an unlocking state and powers on the cleaning machine again.
5. The operating method for reducing the false alarm leakage fault of the cleaning machine according to claim 4, characterized in that: the cleaning machine is set to be in a self-locking state just before leaving a factory and being not installed.
6. The operating method for reducing false alarm leakage faults of a cleaning machine according to claim 5, characterized by comprising the following steps: when the cleaning machine carries out leakage fault alarm, the cleaning machine is automatically set to be in a self-locking state.
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| CN202110701108.3A CN113567881B (en) | 2021-06-24 | 2021-06-24 | Working method for reducing false alarm of electric leakage fault of cleaning machine |
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