CN113258533B - Intelligent no-tripping leakage protection method and system - Google Patents
Intelligent no-tripping leakage protection method and system Download PDFInfo
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- CN113258533B CN113258533B CN202110731047.5A CN202110731047A CN113258533B CN 113258533 B CN113258533 B CN 113258533B CN 202110731047 A CN202110731047 A CN 202110731047A CN 113258533 B CN113258533 B CN 113258533B
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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
- H02H3/33—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 using summation current transformers
- H02H3/334—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 using summation current transformers with means to produce an artificial unbalance for other protection or monitoring reasons or remote control
- H02H3/335—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 using summation current transformers with means to produce an artificial unbalance for other protection or monitoring reasons or remote control the main function being self testing of the device
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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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- 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
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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Abstract
The invention provides an intelligent no-tripping leakage protection method and system, wherein the method comprises the following steps: when detecting that the non-tripping leakage protector sends out a leakage alarm signal, controlling the first contactor, the second contactor and the third contactor to be disconnected simultaneously through the control circuit board, and immediately starting timing to obtain first time; when the first time exceeds a first preset time, the control circuit board sequentially controls the first contactor, the second contactor and the third contactor to be switched on, and records an alarm state of the leakage protector which is not buckled during each switching-on; and determining the reason of the leakage fault according to the alarm state of the leakage protector which is not broken off when the leakage protector is switched on every time. The intelligent non-tripping leakage protection method provided by the invention can realize automatic power-off self-detection after leakage occurs, ensure the safety of personnel and automatic power-on in time, ensure the safety and convenience of normal power utilization and meet the requirements of practical application.
Description
Technical Field
The invention relates to the technical field of electric leakage control, in particular to an intelligent no-tripping electric leakage protection method and system.
Background
With the continuous progress of society and the continuous development of economy, electrical equipment becomes more and more common in the life of people. With the increasing popularization of electric equipment, the electric safety becomes a key item needing attention in daily life.
Generally, the safety of power utilization is mainly to prevent the problems of injury to personnel and interruption of power utilization caused by electric leakage in the process of power utilization as far as possible. Specifically, the current leakage protection of the household electrical appliance generally includes two measures: one is that the metal shell is connected with a power ground wire, and when leakage current occurs, the power ground wire is led into a common ground, so that electric shock accidents to human bodies are avoided; the other is that a leakage protection switch is arranged at the position of a power supply inlet wire, and when leakage occurs, the power supply of the electrical equipment is directly cut off to realize protection.
However, the conventional earth leakage protector trips after the electricity leakage occurs, so that the load is powered off, and the normal use of the load is influenced; and the reason of electric leakage can not be checked by self, manual checking is completely needed, and the efficiency is low.
Disclosure of Invention
Based on the technical scheme, the invention aims to solve the problem that the conventional leakage protector trips after leakage occurs, so that the load is powered off and the normal use of the load is influenced; and the leakage reason can not be checked by self, manual checking is completely needed, and the efficiency is low.
The invention provides an intelligent no-tripping leakage protection method which is applied to an intelligent no-tripping leakage protection circuit, wherein the intelligent no-tripping leakage protection circuit comprises a no-tripping leakage protector, the output end of the no-tripping leakage protector is respectively electrically connected with a first contactor, a second contactor and a third contactor, control coils in the first contactor, the second contactor and the third contactor are respectively electrically connected with an intermediate relay, the output end of the intermediate relay is electrically connected with a control circuit board, and the control circuit board is electrically connected with the no-tripping leakage protector;
the method comprises the following steps:
the method comprises the following steps: when the non-tripping leakage protector is detected to send out a leakage alarm signal, the control circuit board controls the first contactor, the second contactor and the third contactor to be simultaneously disconnected, and timing is immediately started to obtain first time;
step two: when the first time exceeds a first preset time, the control circuit board sequentially controls the first contactor, the second contactor and the third contactor to be switched on, and records the alarm state of the non-tripping leakage protector during each switching on;
step three: and determining the reason of the leakage fault according to the alarm state of the non-tripping leakage protector during each closing.
According to the intelligent no-tripping leakage protection method provided by the invention, when the no-tripping leakage protector sends out a leakage alarm signal, the control circuit board controls the first contactor, the second contactor and the third contactor to be simultaneously switched off so as to avoid the injury of a man-made contact accident to personnel;
after the first contactor, the second contactor and the third contactor are all disconnected, self-checking is carried out on the reason of the leakage, namely the first contactor, the second contactor and the third contactor are sequentially controlled to be switched on through the control circuit board, the alarm state of the leakage protector is not tripped when the first contactor, the second contactor and the third contactor are switched on at each time is recorded, and the alarm state of the leakage protector is not tripped when the first contactor, the second contactor and the third contactor are switched on at each time, so that the reason of the leakage fault is determined. The intelligent non-tripping leakage protection method provided by the invention can realize automatic power-off self-detection after leakage occurs, ensure the safety of personnel and automatic power-on in time, ensure the safety and convenience of normal power utilization and meet the requirements of practical application.
The intelligent no-trip leakage protection method comprises the following steps of:
and when the first contactor, the second contactor and the third contactor are switched on in sequence, and the non-tripping leakage protector does not give an alarm every time when the first contactor, the second contactor and the third contactor are switched on, the intelligent non-tripping leakage protection circuit is judged to be in accidental leakage.
The intelligent no-trip leakage protection method comprises the following steps of:
when the first contactor is switched on, the non-tripping leakage protector gives an alarm;
when the second contactor and the third contactor are switched on respectively and the second contactor and the third contactor are switched on simultaneously, the non-tripping leakage protector does not give an alarm;
it is determined that the first contactor has an electric leakage.
The intelligent no-trip leakage protection method comprises the following steps that:
when the current leakage current value of the non-tripping leakage protector is larger than a second leakage threshold value, generating a second leakage alarm signal;
when the non-tripping leakage protector is detected to send out the second leakage alarm signal, the first contactor, the second contactor and the third contactor are controlled to be disconnected simultaneously through the control circuit board, and timing is started immediately to obtain the first time.
The intelligent no-trip leakage protection method comprises the following steps:
when the current leakage current value of the non-tripping leakage protector is smaller than the second leakage threshold value and larger than a first leakage threshold value, generating a first leakage alarm signal;
when the non-tripping leakage protector is detected to send out the first leakage alarm signal, the first contactor, the second contactor and the third contactor are controlled to be switched off after a second preset time through the control circuit board.
The intelligent no-trip leakage protection method comprises the following steps:
when the fact that the non-tripping leakage protector sends out the first leakage alarm signal is detected each time, counting is correspondingly conducted to obtain the first type of fault frequency;
when the second leakage alarm signal is sent out by the non-tripping leakage protector every time, counting is correspondingly carried out to obtain the number of times of the second type of faults;
and counting to obtain the first type fault frequency and the second type fault frequency corresponding to the preset service time, and calculating to obtain a service fault rate and a fault type ratio according to the first type fault frequency and the second type fault frequency, wherein the fault types in the fault type ratio comprise artificial accidental leakage faults, equipment leakage faults and environmental factor leakage faults.
The intelligent no-trip leakage protection method comprises the following steps:
when the first contactor, the second contactor or the third contactor is judged to have electric leakage, the equipment is determined to have electric leakage fault;
when the intelligent non-tripping leakage protection circuit is judged to be accidental leakage, the artificial accidental leakage fault is determined;
and when the non-tripping leakage protector is judged to send out the first leakage alarm signal, the environmental factor leakage fault is determined.
The intelligent no-trip leakage protection method is characterized in that the control circuit board is electrically connected with a humidity detector, the humidity detector is used for detecting air humidity, and the method further comprises the following steps:
when the non-tripping leakage protector sends out the first leakage alarm signal every time, detecting to obtain the current fault air humidity through the humidity detector;
calculating to obtain the fault average air humidity according to the current fault air humidities;
when the non-tripping leakage protector does not send any alarm signal, the humidity detector detects and obtains the air humidity under normal working conditions;
calculating to obtain the average air humidity of the normal working condition according to the air humidity of the plurality of normal working conditions;
and calculating to obtain an alarm air humidity threshold value according to the fault average air humidity and the normal working condition average air humidity.
The intelligent no-trip leakage protection method comprises the following steps:
when the non-tripping leakage protector simultaneously generates a first leakage alarm signal and a second leakage alarm signal, the control circuit board controls the first contactor, the second contactor and the third contactor to be simultaneously disconnected, and immediately starts to time to obtain the first time;
judging whether the current fault air humidity is smaller than the alarm air humidity threshold value;
if yes, the control circuit board sequentially controls the first contactor, the second contactor and the third contactor to be switched on, and records the alarm state of the non-tripping leakage protector during each switching on;
and determining the reason of the leakage fault according to the alarm state of the non-tripping leakage protector during each closing.
The invention also provides an intelligent non-tripping leakage protection system, wherein the system comprises a non-tripping leakage protector, and the output end of the non-tripping leakage protector is electrically connected with the first contactor, the second contactor and the third contactor respectively;
the control coils in the first contactor, the second contactor and the third contactor are respectively electrically connected with an intermediate relay, the output end of the intermediate relay is electrically connected with a control circuit board, and the control circuit board is electrically connected with the non-tripping leakage protector;
the intelligent no-tripping leakage protection system applies the intelligent no-tripping leakage protection method.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a flowchart of an intelligent no-trip leakage protection method according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an intelligent tripping-free leakage protection system according to a first embodiment of the present invention;
FIG. 3 is an enlarged view of the portion V in FIG. 2;
fig. 4 is a flowchart of an intelligent no-trip leakage protection method according to a second embodiment of the present invention;
fig. 5 is a flowchart of an intelligent no-trip leakage protection method according to a third embodiment of the present invention;
fig. 6 is a flowchart of an intelligent no-trip leakage protection method according to a fourth embodiment of the present invention;
FIG. 7 is a schematic diagram of the type ratio of a fault in the fourth embodiment of the present invention;
fig. 8 is a flowchart of an intelligent no-trip leakage protection method according to a fifth embodiment of the present invention;
fig. 9 is a schematic structural diagram of an intelligent no-trip leakage protection system according to a fifth embodiment of the present invention;
fig. 10 is a flowchart of an intelligent no-trip leakage protection method according to a sixth embodiment of the present invention.
Description of the main symbols:
11. the leakage protector is not tripped; 12. a control circuit board; 13. an intermediate relay; 21. a moisture detector; 110. a reset key port; 111. a normally open port; 112. a normally closed port; 113. a common port; 201. a first contactor; 202. a second contactor; 203. and a third contactor.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The traditional leakage protector trips after leakage occurs, so that the load is powered off, and the normal use of the load is influenced; and the reason of electric leakage can not be checked by self, manual checking is completely needed, and the efficiency is low.
In order to solve the technical problem, the present invention provides an intelligent no-trip leakage protection method, and referring to fig. 1 to 3, a first embodiment of the present invention provides an intelligent no-trip leakage protection method, which is applied to an intelligent no-trip leakage protection circuit.
As shown in fig. 2 and fig. 3, the intelligent no-trip leakage protection circuit includes a no-trip leakage protector 11, and the output end of the no-trip leakage protector 11 is electrically connected to the first contactor 201, the second contactor 202, and the third contactor 203, respectively. The control coils in the first contactor 201, the second contactor 202 and the third contactor 203 are electrically connected to the intermediate relay 13, the output end of the intermediate relay 13 is electrically connected to the control circuit board 12, and the control circuit board 12 is electrically connected to the non-tripping leakage protector 11.
Specifically, as shown in fig. 3, the non-tripping leakage protector 11 is provided with a normally open port 111 (conducting is alarm), a normally closed port 112 (conducting is no alarm) and a common port 113 on one side of the non-tripping leakage protector 11. The normally open port 111, the normally closed port 112 and the common port 113 are electrically connected to the control circuit board 12. In addition, a reset key port 110 is further provided on one side of the non-tripping leakage protector 11, and the reset key port 110 is electrically connected to the control circuit board 12 through a lead.
It should be further noted that the output ends of the first contactor 201, the second contactor 202, and the third contactor 203 are electrically connected to a load electrical appliance. And the cathodes of the first contactor 201, the second contactor 202 and the third contactor 203 are all electrically connected to the intermediate relay 13. In fig. 2, L1 for the first contactor 201, L2 for the second contactor 202, and L3 for the third contactor 203 are all live wires, and N is a neutral wire.
In this embodiment, the intelligent no-trip leakage protection method specifically includes the following steps:
s101, when the non-tripping leakage protector is detected to send out a leakage alarm signal, the first contactor, the second contactor and the third contactor are controlled to be disconnected simultaneously through the control circuit board, and timing is started immediately to obtain first time.
In this step, it can be understood that if it is detected that the leakage protector 11 is not buckled to send out a leakage alarm signal, it may be that an artificial accidental leakage occurs or the contactor generates a leakage. In order to avoid the injury of personnel, the first contactor 201, the second contactor 202 and the third contactor 203 are controlled by the control circuit board to be simultaneously opened at the same time of detecting the leakage alarm signal, so that the personnel safety is ensured. And timing to obtain a first time while opening each contactor. In this embodiment, the leakage alarm signal includes a first leakage alarm signal and a second leakage alarm signal.
And S102, when the first time exceeds a first preset time, the control circuit board sequentially controls the first contactor, the second contactor and the third contactor to be switched on, and records the alarm state of the non-tripping leakage protector during each switching on.
As described above, since the first contactor 201, the second contactor 202, and the third contactor 203 are opened immediately after the occurrence of the electrical leakage is detected, the safety of use is ensured. In this step, after the first time (e.g., 5 min) of disconnection, the fault self-test is started. Specifically, in this step, the control circuit board sequentially controls the first contactor 201, the second contactor 202, and the third contactor 203 to be closed, and records an alarm state that the earth leakage protector 11 is not tripped each time the contactors are closed.
In the present invention, the leakage fault includes three types: a. an artificial accidental electric leakage fault (the electric leakage alarm signal is a second electric leakage alarm signal); b. the equipment has a leakage fault (the leakage alarm signal is a second leakage alarm signal); c. and (4) environmental factor leakage fault (the leakage alarm signal is the first leakage alarm signal).
Specifically, the method comprises the following steps:
(1) the first method for determining the artificial accidental leakage fault comprises the following steps:
when the first contactor 201, the second contactor 202 and the third contactor 203 are sequentially switched on, and no warning is given when the leakage protector 11 is not tripped during switching on at each time, it is determined that the intelligent non-tripping leakage protection circuit is an artificial accidental leakage fault.
(2) The second method for determining the leakage fault of the device (including the fault of the first contactor 201, the second contactor 202 or the third contactor 203) is as follows:
when the first contactor 201 is switched on, the leakage protector 11 does not break off and gives an alarm;
when the second contactor 202 and the third contactor 203 are respectively switched on, and the second contactor 202 and the third contactor 203 are simultaneously switched on, the leakage protector 11 is not buckled, and no alarm exists;
it is determined that the first contactor 201 has an electric leakage.
Similarly, the determination method of the second contactor 202 having the electrical leakage is as follows:
when the second contactor 202 is switched on, the leakage protector 11 is not buckled for warning;
when the first contactor 201 and the third contactor 203 are respectively switched on and the first contactor 201 and the third contactor 203 are simultaneously switched on, the leakage protector 11 is not buckled, and no alarm exists;
it is determined that the second contactor 202 has an electric leakage.
Similarly, the determination method of the occurrence of the electric leakage of the third contactor 203 is as follows:
when the third contactor 203 is switched on, the leakage protector 11 does not break off and gives an alarm;
when the first contactor 201 and the second contactor 202 are respectively switched on and the first contactor 201 and the second contactor 202 are simultaneously switched on, the leakage protector 11 is not buckled, and no alarm exists;
it is determined that the third contactor 203 has an electric leakage.
(3) The third method for judging the leakage fault caused by the environmental factors comprises the following steps:
and when the leakage protector is judged not to be tripped and a first leakage alarm signal is sent, the environmental factor leakage fault is determined. It should be noted that, the first leakage warning signal is different from the second leakage warning signal; in the case of an electrical leakage fault caused by an environmental factor, the first contactor 201, the second contactor 202, and the third contactor 203 are not immediately turned off upon detection of the electrical leakage warning signal, and therefore, the following embodiments will be described with respect to the case of an electrical leakage fault caused by an environmental factor.
And S103, determining the reason of the leakage fault according to the alarm state of the non-tripping leakage protector during each closing.
As described in step S102, the cause of the leakage fault is determined according to the alarm state of the leakage protector that is not tripped each time the leakage protector is switched on. In the present invention, the method specifically includes: a. an artificial accidental electric leakage fault (the electric leakage alarm signal is a second electric leakage alarm signal); b. the equipment has a leakage fault (the leakage alarm signal is a second leakage alarm signal); c. environmental factors leakage faults.
According to the intelligent no-tripping leakage protection method provided by the invention, when the no-tripping leakage protector sends out a leakage alarm signal (a second leakage alarm signal), the control circuit board 12 controls the first contactor 201, the second contactor 202 and the third contactor 203 to be simultaneously switched off so as to avoid the injury to personnel caused by artificial contact accidents;
after the first contactor 201, the second contactor 202 and the third contactor 203 are all disconnected, the self-checking of the reason of the leakage starts, that is, the first contactor 201, the second contactor 202 and the third contactor 203 are sequentially controlled to be switched on through the control circuit board 12, the alarm state of the leakage protector 11 is recorded when the leakage protector is not tripped each time the leakage protector is switched on, and the reason of the leakage fault is determined according to the alarm state of the leakage protector 11 when the leakage protector is not tripped each time the leakage protector is switched on each time. The intelligent non-tripping leakage protection method provided by the invention can realize automatic power-off self-detection after leakage occurs, ensure the safety of personnel and automatic power-on in time, ensure the safety and convenience of normal power utilization and meet the requirements of practical application.
Example two:
the following describes the embodiments of the present invention in more detail by way of a specific example. Referring to fig. 4, an intelligent no-trip leakage protection method according to a second embodiment of the present invention specifically includes the following steps:
s201, when the current leakage current value of the non-tripping leakage protector is larger than a second leakage threshold value, a second leakage alarm signal is generated.
It should be added that, when the electric leakage is determined, a first electric leakage threshold and a second electric leakage threshold are correspondingly set, and the first electric leakage threshold is smaller than the second electric leakage threshold.
S202, when detecting that the no-tripping leakage protector sends out a second leakage alarm signal, controlling the first contactor, the second contactor and the third contactor to be disconnected simultaneously through the control circuit board, and immediately starting timing to obtain first time.
S203, when the first time exceeds the first preset time, the control circuit board sequentially controls the first contactor, the second contactor and the third contactor to be switched on, and records the alarm state of the leakage protector which is not buckled every time of switching on.
The specific determination manner is as described in step S102 in the first embodiment, and is not described herein again.
And S204, determining the reason of the leakage fault according to the alarm state of the leakage protector which is not broken off during closing each time.
As described in the first embodiment, if the second leakage alarm signal is reported without tripping the leakage protector, the leakage fault causes may include an artificial accidental leakage fault and a leakage fault of the device itself. The result of actual self-checking detection is used as the standard.
Example three:
the following describes the embodiments of the present invention in more detail by way of a specific example. Referring to fig. 5, an intelligent no-trip leakage protection method according to a third embodiment of the present invention specifically includes the following steps:
s301, when the current leakage current value of the non-tripping leakage protector is smaller than the second leakage threshold value and larger than the first leakage threshold value, a first leakage alarm signal is generated.
As described above, when the leakage determination is performed, the first leakage threshold and the second leakage threshold are correspondingly set, and the first leakage threshold is smaller than the second leakage threshold.
S302, when the fact that the non-tripping leakage protector sends out a first leakage alarm signal is detected, the first contactor, the second contactor and the third contactor are controlled to be switched off after a second preset time through the control circuit board.
It should be noted that, in the practical use of the circuit, the leakage may be caused by environmental factors; the leakage is weak, and the normal use of the electric appliance is not influenced. However, the leakage is objective and cannot be ignored.
Therefore, in this embodiment, if the current leakage current value is smaller than the second leakage current threshold and larger than the first leakage current threshold, it indicates that there is a leakage current phenomenon, but the current value of the leakage current is not large. In order to avoid influencing the normal operation of the electrical equipment as much as possible, in the embodiment, when a weak leakage is detected, only the first leakage alarm signal is generated by not buckling the leakage protector, and each contactor is not immediately disconnected. But is switched off after a second preset time (e.g. 1 h) to remind the staff to check while avoiding affecting the normal operation of the electrical equipment as much as possible.
Example four:
in order to better analyze the type of fault that does not intelligently break down the earth leakage protection circuit, a specific embodiment of the present invention is described in more detail below in a specific embodiment. Referring to fig. 6 and 7, an intelligent no-trip leakage protection method according to a fourth embodiment of the present invention specifically includes the following steps:
s401, when the fact that the non-tripping leakage protector sends out the first leakage alarm signal is detected every time, counting is correspondingly conducted to obtain the first type of fault frequency.
In the present invention, as described above, when the first leakage alarm signal is issued without tripping the leakage protector, it is determined that the environmental factor leakage fault has occurred. That is, the first type of fault is an environmental factor leakage fault.
S402, when the second leakage alarm signal is sent out by the non-tripping leakage protector every time, counting is correspondingly carried out to obtain the second type of fault frequency.
As described above, when the second leakage alarm signal is issued without tripping the leakage protector, it is determined that an unexpected leakage fault is caused or the leakage fault of the device itself is caused. That is, the second type of fault includes an artificial accidental electrical leakage fault as well as an electrical leakage fault of the device itself.
And S403, counting the number of times of the first type fault and the number of times of the second type fault corresponding to the preset service time, and calculating the service fault rate and the fault type ratio according to the number of times of the first type fault and the number of times of the second type fault.
In this step, the preset usage time is set to 1 year. It should be noted that the preset usage time may be adjusted according to actual conditions, and is not limited to 1 year.
Specifically, the calculation formula of the use failure rate is as follows:
use failure rate = (number of first type failures + number of second type failures)/100;
the first failure type duty = number of first type failures/(number of first type failures + number of second type failures);
the second fault type ratio = the number of second type faults/(number of first type faults + number of second type faults)
The fault types in the fault type ratio comprise artificial accidental leakage faults, equipment leakage faults and environmental factor leakage faults.
Specifically, when the first contactor, the second contactor or the third contactor is determined to have electric leakage, the equipment itself is determined to have an electric leakage fault;
when the intelligent non-tripping leakage protection circuit is judged to be accidental leakage, the intelligent non-tripping leakage protection circuit is confirmed to be an artificial accidental leakage fault;
and when the leakage protector is judged not to be tripped and the first leakage alarm signal is sent, the environmental factor leakage fault is determined.
In practical applications, after the alarm signal is generated and the fault cause self-checking is performed each time, the three types of faults are counted up correspondingly. And finally, calculating the fault type ratio corresponding to the artificial accidental leakage fault, the equipment leakage fault and the environmental factor leakage fault according to the fault times corresponding to the artificial accidental leakage fault, the equipment leakage fault and the environmental factor leakage fault. And a data chart shown in fig. 7 can be made through data processing to be transmitted to a display terminal, so that the fault type proportion can be known in real time conveniently, and the fault type of the intelligent no-tripping leakage protection circuit can be better analyzed.
Example five:
in order to further analyze the reason of the leakage of the circuit due to environmental factors, a specific embodiment of the present invention is described in more detail below.
It should be noted that the control circuit board 12 is also electrically connected to the moisture detector 21. Wherein the moisture detector 21 is configured to detect the humidity of the air, the method further comprising:
referring to fig. 8 and 9, an intelligent no-trip leakage protection method according to a fifth embodiment of the present invention specifically includes the following steps:
s501, when the non-tripping leakage protector sends the first leakage alarm signal every time, detecting to obtain the current fault air humidity through the humidity detector.
In this step, that is, each time weak electric leakage occurs, the current fault air humidity is detected by the humidity detector 21.
And S502, calculating to obtain the fault average air humidity according to the current fault air humidities.
It can be understood that, each time slight electric leakage occurs, the fault average air humidity is calculated by correspondingly collecting each current fault air humidity. That is, this step is performed to confirm the fault mean air humidity corresponding to the occurrence of the slight electric leakage (first electric leakage warning signal).
And S503, when the no-tripping leakage protector does not send any alarm signal, detecting to obtain normal working condition air humidity through the humidity detector.
It is understood that this step is to collect and confirm the corresponding normal operating air humidity in the air under normal conditions.
And S504, calculating to obtain the average air humidity of the normal working condition according to the plurality of air humidities of the normal working condition.
Further, after acquiring a plurality of normal condition air humidities in step S503, the normal condition average air humidity may be calculated.
And S505, calculating to obtain an alarm air humidity threshold according to the fault average air humidity and the normal working condition average air humidity.
It can be understood that, after the above-mentioned fault average air humidity and normal condition average air humidity are obtained, the intermediate value between the fault average air humidity and the normal condition average air humidity is taken as the alarm air humidity threshold.
It will be appreciated that the alarm air humidity threshold is also in a dynamic process as the environment changes. In the embodiment, the latest environmental data can be acquired in real time, and the alarm threshold value can be scientifically and reasonably adjusted according to the change of the surrounding environment, so that the problem of frequent alarm or slow alarm caused by overhigh alarm trigger line is solved.
Example six:
in actual use, due to unstable current, a problem sometimes occurs in that alarm signals of two fault types are reported simultaneously. In order to more accurately troubleshoot a specific fault, a sixth embodiment of the present invention describes a specific embodiment of the present invention in more detail as a specific example.
Referring to fig. 10, the present embodiment provides an intelligent no-trip leakage protection method, which specifically includes the following steps:
s601, when the non-tripping leakage protector generates a first leakage alarm signal and a second leakage alarm signal at the same time, the control circuit board controls the first contactor, the second contactor and the third contactor to be disconnected at the same time, and immediately starts to time to obtain the first time.
In this step, when not detaining the earth leakage protector and when generating first electric leakage alarm signal and second electric leakage alarm signal simultaneously, in order to guarantee personnel's safety as far as possible, break off simultaneously through control circuit board control first contactor, second contactor and third contactor. At the same time, while the switch is off, timing is started immediately to obtain the first time.
S602, judging whether the current fault air humidity is smaller than the alarm air humidity threshold value.
In this step, it is determined whether the current fault air humidity is less than the alarm air humidity threshold. It will be appreciated that this step is intended to investigate whether a malfunction alarm is due to environmental factors.
And S603, if yes, the control circuit board sequentially controls the first contactor, the second contactor and the third contactor to be switched on, and records the alarm state of the non-tripping leakage protector during each switching on.
Further, if the current fault air humidity is smaller than the alarm air humidity threshold value, it can be determined that the fault alarm is not caused by environmental factors, and then the first leakage alarm signal caused by the current sudden change instability can be determined.
It should be added that, if the current fault air humidity is greater than the alarm air humidity threshold, the reason for the occurrence of the first leakage alarm signal includes environmental factors or current sudden change instability. Then the current value recorded previously can be taken to judge whether the current has a sudden change value, and further judge whether the first leakage alarm signal is generated by the sudden change instability of the current.
And S604, determining the reason of the leakage fault according to the alarm state of the non-tripping leakage protector during each closing.
It can be understood that after the reason generated by the first leakage alarm signal is checked and the first contactor, the second contactor and the third contactor are all disconnected, the self-check of closing is started to determine the fault reason corresponding to the second leakage alarm signal. This step is described in detail in the first embodiment, and is not described herein again.
The invention also provides an intelligent non-tripping leakage protection system, wherein the system comprises a non-tripping leakage protector, and the output end of the non-tripping leakage protector is electrically connected with the first contactor, the second contactor and the third contactor respectively;
the control coils in the first contactor, the second contactor and the third contactor are respectively electrically connected with an intermediate relay, the output end of the intermediate relay is electrically connected with a control circuit board, and the control circuit board is electrically connected with the non-tripping leakage protector;
the intelligent no-tripping leakage protection system applies the intelligent no-tripping leakage protection method.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. An intelligent no-tripping leakage protection method is applied to an intelligent no-tripping leakage protection circuit and is characterized in that the intelligent no-tripping leakage protection circuit comprises an no-tripping leakage protector, the output end of the no-tripping leakage protector is electrically connected with a first contactor, a second contactor and a third contactor respectively, control coils in the first contactor, the second contactor and the third contactor are electrically connected with an intermediate relay respectively, the output end of the intermediate relay is electrically connected with a control circuit board, and the control circuit board is electrically connected with the no-tripping leakage protection circuit;
the method comprises the following steps:
the method comprises the following steps: when the non-tripping leakage protector is detected to send out a leakage alarm signal, the control circuit board controls the first contactor, the second contactor and the third contactor to be simultaneously disconnected, and timing is immediately started to obtain first time;
step two: when the first time exceeds a first preset time, the control circuit board sequentially controls the first contactor, the second contactor and the third contactor to be switched on, and records the alarm state of the non-tripping leakage protector during each switching on;
step three: determining the reason of the leakage fault according to the alarm state of the non-tripping leakage protector during each switching-on;
the electric leakage alarm signal comprises a first electric leakage alarm signal and a second electric leakage alarm signal, and the method further comprises the following steps:
when the current leakage current value of the non-tripping leakage protector is larger than a second leakage threshold value, generating a second leakage alarm signal;
when the non-tripping leakage protector is detected to send out a second leakage alarm signal, the control circuit board controls the first contactor, the second contactor and the third contactor to be switched off simultaneously, and timing is started immediately to obtain the first time;
the method further comprises the following steps:
when the current leakage current value of the non-tripping leakage protector is smaller than the second leakage threshold value and larger than a first leakage threshold value, generating a first leakage alarm signal;
when the non-tripping leakage protector is detected to send out the first leakage alarm signal, the first contactor, the second contactor and the third contactor are controlled to be switched off after a second preset time through the control circuit board.
2. The intelligent no-trip leakage protection method according to claim 1, wherein the method for determining the cause of the leakage fault according to the alarm state of the no-trip leakage protector at each closing comprises:
and when the first contactor, the second contactor and the third contactor are sequentially switched on, and the non-tripping leakage protector does not give an alarm every time when the first contactor, the second contactor and the third contactor are switched on, the intelligent non-tripping leakage protection circuit is judged to be in accidental leakage.
3. The intelligent no-trip leakage protection method according to claim 1, wherein the method for determining the cause of the leakage fault according to the alarm state of the no-trip leakage protector at each closing further comprises:
when the first contactor is switched on, the non-tripping leakage protector gives an alarm;
when the second contactor and the third contactor are switched on respectively and the second contactor and the third contactor are switched on simultaneously, the non-tripping leakage protector does not give an alarm;
it is determined that the first contactor has an electric leakage.
4. The intelligent no-trip leakage protection method according to claim 1, further comprising:
when the fact that the non-tripping leakage protector sends out the first leakage alarm signal is detected each time, counting is correspondingly conducted to obtain the first type of fault frequency;
when the second leakage alarm signal is sent out by the non-tripping leakage protector every time, counting is correspondingly carried out to obtain the number of times of the second type of faults;
and counting to obtain the first type fault frequency and the second type fault frequency corresponding to the preset service time, and calculating to obtain a service fault rate and a fault type ratio according to the first type fault frequency and the second type fault frequency, wherein the fault types in the fault type ratio comprise artificial accidental leakage faults, equipment leakage faults and environmental factor leakage faults.
5. The intelligent no-trip leakage protection method according to claim 4, further comprising:
when the first contactor, the second contactor or the third contactor is judged to have electric leakage, the equipment is determined to have electric leakage fault;
when the intelligent non-tripping leakage protection circuit is judged to be accidental leakage, the artificial accidental leakage fault is determined;
and when the non-tripping leakage protector is judged to send out the first leakage alarm signal, the environmental factor leakage fault is determined.
6. The intelligent no-trip leakage protection method according to claim 1, wherein the control circuit board is further electrically connected to a moisture detector, the moisture detector is configured to detect air humidity, and the method further comprises:
when the non-tripping leakage protector sends out the first leakage alarm signal every time, detecting to obtain the current fault air humidity through the humidity detector;
calculating to obtain the fault average air humidity according to the current fault air humidities;
when the non-tripping leakage protector does not send any alarm signal, the humidity detector detects and obtains the air humidity under normal working conditions;
calculating to obtain the average air humidity of the normal working condition according to the air humidity of the plurality of normal working conditions;
and calculating to obtain an alarm air humidity threshold value according to the fault average air humidity and the normal working condition average air humidity.
7. The intelligent no-trip leakage protection method according to claim 6, further comprising:
when the non-tripping leakage protector simultaneously generates a first leakage alarm signal and a second leakage alarm signal, the control circuit board controls the first contactor, the second contactor and the third contactor to be simultaneously disconnected, and immediately starts to time to obtain the first time;
judging whether the current fault air humidity is smaller than the alarm air humidity threshold value;
if yes, the control circuit board sequentially controls the first contactor, the second contactor and the third contactor to be switched on, and records the alarm state of the non-tripping leakage protector during each switching on;
and determining the reason of the leakage fault according to the alarm state of the non-tripping leakage protector during each closing.
8. An intelligent non-tripping electric leakage protection system is characterized by comprising a non-tripping electric leakage protector, wherein the output end of the non-tripping electric leakage protector is electrically connected with a first contactor, a second contactor and a third contactor respectively;
the control coils in the first contactor, the second contactor and the third contactor are respectively electrically connected with an intermediate relay, the output end of the intermediate relay is electrically connected with a control circuit board, and the control circuit board is electrically connected with the non-tripping leakage protector;
the intelligent no-tripping leakage protection system applies an intelligent no-tripping leakage protection method as claimed in any one of the preceding claims 1 to 7.
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