CN114123126B - Leakage protection switch, leakage protection method and storage medium - Google Patents
Leakage protection switch, leakage protection method and storage medium Download PDFInfo
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- CN114123126B CN114123126B CN202111386843.6A CN202111386843A CN114123126B CN 114123126 B CN114123126 B CN 114123126B CN 202111386843 A CN202111386843 A CN 202111386843A CN 114123126 B CN114123126 B CN 114123126B
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- 238000001514 detection method Methods 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 3
- 238000012790 confirmation Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 6
- 230000007257 malfunction Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
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- 238000004880 explosion Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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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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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/12—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to undesired approach to, or touching of, live parts by living beings
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- Emergency Protection Circuit Devices (AREA)
Abstract
The embodiment of the invention provides a leakage protection switch, a leakage protection method and a storage medium. When the leakage protection switch is installed on the head end of a line, corresponding leakage protection actions are executed by determining the leakage type of the line and a preset protection strategy, so that the purpose of immediately tripping and powering off when the leakage type is human body electric shock leakage is achieved, the personal safety is protected, and when the leakage type is insulation damage leakage, whether the power is off can be determined according to a tripping current threshold value, the problem that the power failure range is enlarged due to slight leakage or the fact that the user line is tripped and powered off is solved, and unnecessary power failure is avoided.
Description
Technical Field
The embodiment of the invention relates to the technical field of power line protection, in particular to a leakage protection switch, a leakage protection method and a storage medium.
Background
With the complicating of the power utilization condition of the power line, the power line may leak, for example, after the power line is insulated and damaged, the power line leaks, or the power line leaks after the power line is conducted and the power line leaks, or the power line leaks due to the fact that a human body or other organisms contacts with a bare conductor or is caused by improper operation.
In order to ensure the safety of a low-voltage power line, a leakage protection switch is arranged on the low-voltage power line at present, such as a total leakage protection switch is arranged between a total power supply and a public line, and a sub leakage protection switch is arranged between the public line and a plurality of branch lines.
Disclosure of Invention
The embodiment of the invention provides a leakage protection switch, a leakage protection method and a storage medium, which are used for solving the problems that the current leakage protection switch cannot protect the safety of a public line electric shock and avoid enlarging the power failure range.
In a first aspect, an embodiment of the present invention provides a leakage protection switch, including:
the leakage current detection module is used for detecting the current flowing through the leakage protection switch to obtain leakage current data;
the comparison module is used for comparing the leakage current data with preset current data to obtain a leakage type;
And the leakage protection action module is used for executing the leakage protection action according to the leakage type and a preset protection strategy.
In a second aspect, an embodiment of the present invention further provides a leakage protection method, which is applied to the leakage protection switch in any one of the first aspect, where the leakage protection method includes:
detecting the current flowing through the leakage protection switch to obtain leakage current data;
comparing the leakage current data with preset current data to obtain a leakage type;
And executing the leakage protection action according to the leakage type and a preset protection strategy.
In a third aspect, embodiments of the present invention also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the earth leakage protection method according to any one of the second aspects.
The leakage protection switch comprises a leakage current detection module, a comparison module and a leakage protection action module, wherein the leakage current detection module detects and obtains leakage current data, the comparison module compares the leakage current data with preset current data to obtain a leakage type, and the leakage protection action module executes leakage protection action according to the leakage type and a preset protection strategy. When the leakage protection switch is installed on the head end of the public line, corresponding leakage protection actions are executed by determining the leakage type of the line and a preset protection strategy, so that the purpose of immediately tripping and powering off when the leakage type is human body electric shock leakage is achieved, personal safety is protected, and when the leakage type is insulation damage leakage, whether the power is off can be determined according to a tripping current threshold value, the problem that the power failure range is enlarged due to the fact that the public line or branch line is slightly tripped and powered off or the problem that the power failure range is enlarged due to override trip and power failure of the user line is avoided.
Drawings
Fig. 1 is a block diagram of a leakage protection switch according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a leakage protection switch disposed on a circuit according to an embodiment of the present invention;
FIG. 3 is a block diagram of a comparison module according to a first embodiment of the present invention;
fig. 4 is a block diagram of a leakage protection operation module according to an embodiment of the present invention;
FIG. 5 is a block diagram of another leakage protection switch according to a first embodiment of the present invention;
Fig. 6 is a flowchart of a leakage protection method according to a second embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a schematic diagram of a leakage protection switch according to an embodiment of the present invention, where the leakage protection switch according to the embodiment of the present invention may be installed on a power transmission line, and as shown in fig. 1, the leakage protection switch according to the embodiment of the present invention includes a leakage current detection module 10, a comparison module 20, and a leakage protection operation module 30, where the comparison module 20 is connected to the leakage current detection module 10 and the leakage protection operation module 30, respectively.
As shown in fig. 2, in one example, the power supply 11 is a total power supply of a plurality of levels of lines, the first line 13 is connected to the power supply 11 through the first leakage protection switch 12, the lower line of the first line 13 is the second line 15, the lower line of the first leakage protection switch 12 is the second leakage protection switch 14, and the lower line of the second line 15 is the third line 17.
Wherein, each line can be provided with a certain number of electricity utilization units or electric equipment, and the electricity utilization units can be cells, buildings, households and the like.
As shown in fig. 1, the leakage current detection module 10 is configured to detect a current flowing through the leakage protection switch to obtain leakage current data, and specifically, the leakage current detection module may include an apparatus for collecting a current, for example, may include a current collecting unit that may collect a current value of a current flowing through a line, determine whether leakage occurs by using the current value within a specified period of time, and collect, when leakage occurs, current data of the current within the specified period of time as leakage current data.
The comparison module 20 is configured to compare the current leakage data collected currently with the preset current data to obtain a leakage type, where the leakage type may include human body electric shock leakage and insulation damage leakage, and the change rule of the human body electric shock leakage current and insulation damage leakage current is distinct and easy to distinguish, so that the leakage current can be distinguished by comparing the current leakage data to determine whether the leakage current belongs to the human body electric shock leakage current or the insulation damage leakage current.
In an alternative embodiment, the current data of the human body electric shock leakage can be stored in advance, the current data of the current collected electric leakage can be compared with the current data of the human body electric shock leakage stored in advance, so as to determine whether the current collected electric leakage belongs to the current of the human body electric shock leakage, namely, whether the current collected electric leakage is of the type of the current collected electric leakage, and whether the current of the electric leakage belongs to the current of the human body electric shock leakage can be distinguished by comparing the curve of the current of the electric leakage with the curve of the preset human body electric shock current.
In another alternative embodiment, a current model of human body electric shock leakage can be stored in advance, the currently collected leakage data is converted into a model and then compared with the pre-stored human body electric shock leakage current model, and the leakage type of the currently collected leakage current is determined.
The human body electric shock comprises human body direct electric shock and human body indirect electric shock, wherein the human body direct electric shock means electric shock generated after the human body surface is directly contacted with the leakage power supply, for example, hands or feet touch the power supply; the human body indirect contact means that the human body generates electric shock after contacting a power supply through other objects, such as shoes, socks, walls or other conductors, and the overall difference between the change rule of the direct electric shock of the human body and the change rule of the current between the human body and the contact is small, so that the electric leakage current model of the human body electric shock can be obtained by fitting the electric leakage current models of the direct electric shock of the human body and the contact electric leakage current between the human body.
The current curve of the electric shock and the electric leakage of the human body can be obtained by adopting other materials similar to the human body and simulating different types of human body electric shock.
The leakage protection action module 30 is configured to perform a leakage protection action according to a leakage type and a preset protection policy.
Since the severity of the consequences caused by different leakage types and leakage currents is different, a plurality of different protection strategies can be set correspondingly according to the different leakage types and leakage current values, the protection strategies can be modules for indicating the leakage protection action module 30 to execute corresponding protection actions when preset conditions are met, wherein the preset conditions can be the leakage types and/or the leakage current values, for example, the protection strategies can be immediate tripping when the leakage types are electric shock and leakage of a human body, the protection strategies can be tripping or delayed tripping when the leakage types are insulation damage and the leakage current values are larger than preset current thresholds, and the like.
In an alternative embodiment, a tripping current threshold value when insulation damage leakage occurs can be preset, when the type of human body electric shock leakage occurs, tripping is immediately performed, when insulation damage leakage occurs, the leakage current value is calculated, the leakage current value is compared with a preset tripping current threshold value, when the leakage current value is greater than or equal to the preset tripping current threshold value, the leakage protection switch trips in a short delay, such as after 0.1 second delay, or else the leakage protection switch does not trip or trips in a long delay, such as after 120 seconds delay.
The leakage protection switch comprises a leakage current detection module, a comparison module and a leakage protection action module, wherein the leakage current detection module detects and obtains leakage current data, the comparison module compares the leakage current data with preset current data to obtain a leakage type, and the leakage protection action module executes leakage protection action according to the leakage type and a preset protection strategy. When the leakage protection switch is installed on the head end of a public line, corresponding leakage protection actions are executed by determining the leakage type of the line and a preset protection strategy, so that the purpose of immediately tripping and powering off when the leakage type is human body electric shock leakage is achieved, personal safety is protected, and when the leakage type is insulation damage leakage, whether the power is off can be determined according to a tripping current threshold value, the problem that the power failure range is widened due to slight insulation damage leakage or the fact that the user line is tripped and powered off is solved, and unnecessary power failure is avoided.
As shown in fig. 3, in an alternative embodiment, the comparison module 20 includes a similarity calculation sub-module 201, a judgment sub-module 202, a human body electric shock and leakage determination sub-module 203, and an insulation damage and leakage determination sub-module 204.
The similarity calculation sub-module 201 is configured to calculate a similarity between the leakage current data and preset current data, where in an example, the preset current data may be one or more current values when the human body gets an electric shock and leaks electricity, and an error between the one or more current values and the preset one or more current values may be calculated as the similarity.
In another example, the preset current data may be a leakage current curve when the human body gets an electric shock and leaks electricity, and the similarity comparison may be performed by comparing the detected leakage current curve with the preset current curve, for example, after the leakage current data is collected, a time-current curve may be generated in a coordinate axis as the leakage current curve, and the similarity calculating submodule is further configured to calculate the similarity between the leakage current curve and the preset leakage current curve, where the similarity may be quantified by euclidean distance, cosine distance, and the like. In addition, the acquired leakage current data can be input into a leakage current model obtained according to preset current data, and the similarity between the leakage current and the preset current data can be judged according to the degree of coincidence with the output of the leakage current model.
The judging submodule 202 is used for judging whether the similarity is in a preset value interval, the human body electric shock and electric leakage determining submodule 203 is used for determining that the electric leakage type is human body electric shock and electric leakage when the similarity is in the preset value interval, and the insulating damage electric leakage determining submodule 204 is used for determining that the electric leakage type is insulating damage electric leakage when the similarity is out of the preset value interval.
In another alternative embodiment, the comparing module 20 may further include a display module (not shown), where the display module is configured to display the detected leakage current curve, the preset current curve, the leakage type, the leakage current value, and so on in the display interface, and when the leakage occurs in the line, relevant personnel may implement corresponding line maintenance measures according to the leakage type, the leakage current value, and so on in the display interface, so as to improve the efficiency of line maintenance; or consult the historical data and/or the preset current data to verify whether the action of the leakage protection action module 30 is correct, and if not, correct the action, and store the relevant information in the storage medium so as to avoid such incorrect actions from occurring later, wherein the incorrect actions comprise: malfunction, refusal, reclosing, delay, alarm factors, etc.
According to the embodiment of the invention, the leakage type of the leakage current is identified by calculating the similarity of the leakage current data and the preset current data, so that the leakage type can be accurately and quickly judged, and further, the leakage protection switch can execute corresponding leakage protection action according to the leakage type of the leakage current, so that the situation that the power failure range is enlarged by taking the same tripping measures for different types of leakage is avoided.
In another alternative embodiment, as shown in fig. 4, the leakage protection action module 30 includes a human body electric shock leakage protection action sub-module 301, an insulation damage leakage current value calculation sub-module 302, and an insulation damage leakage protection action sub-module 303.
The human body electric shock and leakage protection action sub-module 301 is used for determining that the protection policy is tripping when the leakage type is human body electric shock and leakage, and because the harm of human body electric shock to human body increases along with the increase of the electric shock action time, when the electric leakage protection switch detects the human body electric shock, tripping action is immediately executed. Specifically, the leakage protection switch for protecting the circuit can be controlled to trip after the leakage type of the circuit obtained from the comparison module is human body electric shock leakage.
The insulation damage leakage current value calculation sub-module 302 is configured to calculate a leakage current value according to the leakage current data when the leakage type is insulation damage leakage, where the leakage current value may be an average value, a maximum value, or the like of the current collected in a specified period of time.
The insulation damage leakage protection action submodule 303 is used for determining a protection strategy according to the leakage current value. Wherein, confirm the protection tactics according to the electric leakage current value, include:
when the leakage current value is smaller than a preset tripping current threshold value I1, determining a protection strategy to be not tripped; when the leakage current value is greater than or equal to a preset tripping current threshold I2, determining that the protection strategy is tripping or tripping after delaying for S1 time; when the leakage current value is greater than or equal to the trip current threshold I1 and less than the trip current threshold I2, the protection strategy is determined to trip after a delay S2 time. Wherein S2 > S1, I2 > I1, the tripping current threshold I1 can be the upper limit of the current value when the line insulation damage leakage is small current leakage, and the tripping current threshold I2 can be the lower limit of the current value when the line insulation damage leakage is large current leakage.
When the leakage current value is smaller than a preset tripping current threshold value I1, the personal safety is not affected, the line electricity consumption is not affected, the danger level can be defined as low-risk defects, the line is inspected and the low-risk defects are repaired in an electrified mode, so that the tripping is not performed when the leakage current value is smaller than the tripping threshold value I1, the power failure of other electricity consumption units or electric equipment caused by tripping of a leakage switch due to the low-risk defects is prevented, and the power supply reliability is improved.
When the leakage current value is greater than or equal to a preset tripping current threshold value I2, accidents such as fire and explosion can occur, the danger level is defined as high-risk defect, the power supply of the leakage position needs to be cut off as soon as possible to prevent accidents caused by the high-risk defect, so that the tripping can be immediately performed or performed after the delay S1 time when the leakage current value is greater than or equal to the preset tripping current threshold value I2, and if the delay tripping action is performed, a shorter delay tripping time should be set, for example, the S1 is set within the range of 0.5-2 seconds.
When the leakage current value is greater than or equal to the trip current threshold value I1 and less than the trip current threshold value I2, the possibility of occurrence of accidents such as fire, explosion and the like is small, and the danger level is defined as a medium-risk defect, but the leakage position can generate heat or release electric sparks due to the leakage current, so that the insulation of the leakage position is further damaged to cause the occurrence of a high-risk defect, fire or short circuit is easy to occur, and the leakage position cannot be in a leakage state for a long time. Therefore, when the leakage current value is greater than or equal to the trip current threshold value I1 and less than the trip current threshold value I2, the protection strategy can be determined to be tripping after the delay S2 time, and when tripping action is executed, a delay tripping time with shorter time can be set, for example, 5-10 seconds, and a longer delay tripping time can be reasonably set, for example, 120 seconds, so that the circuit can still maintain the power supply reliability in the delay tripping time, the time is reserved for taking maintenance measures for staff, and the power failure time is further reduced.
Specifically, the preset tripping current thresholds I1 and I2 and the times S1 and S2 may be set according to requirements of personal equipment safety, environment, and the like, and the embodiment of the present invention is not limited thereto, but it should be noted that S2 > S1 and I2 > I1 after setting.
In an alternative embodiment of the present invention, the leakage protection action module 30 further includes an alarm sub-module 304, which is configured to generate an alarm signal when the type of leakage is determined to be a human electric shock leakage or an insulation damage leakage, where the alarm signal may be an acoustic alarm signal and/or an optical alarm signal, and by setting the alarm sub-module 304, relevant personnel may be timely reminded to timely check and repair a circuit leakage fault or rescue an electric shock person, and also alert the electric shock person and surrounding personnel, so as to avoid occurrence of a secondary human electric shock accident.
According to the embodiment of the invention, different leakage protection strategies are set for the leakage of different leakage types and different leakage current values, so that the safety of an electric shock person when the electric shock of a human body occurs is protected, and the protection strategies with different emergency degrees can be adopted according to the leakage current values when the leakage is damaged by insulation, thereby avoiding the expansion of the power failure range.
In an alternative embodiment of the present invention, the leakage protection switches are divided into a plurality of different switch levels according to the protection ranges of the leakage protection switches, and at least one leakage protection switch is provided in each switch level, as shown in fig. 2, an upper leakage protection switch of the third leakage protection switch 16 is a second leakage protection switch 14 on the power supply side thereof, and an upper leakage protection switch of the second leakage protection switch 14 is a first leakage protection switch 12 on the power supply side thereof. The performance parameter of each leakage protection switch can be set according to the requirement of line protection.
In order to avoid that the leakage protection effect cannot be achieved when the circuit on the load side of the leakage protection switch leaks due to the failure of the functional state of the leakage protection switch, the protection range of the upper-level leakage protection may further include the circuit on the load side of the lower-level leakage protection switch besides the circuit on the load side of the upper-level leakage protection switch, wherein the circuit on the load side is specifically the circuit from the load side of the leakage protection switch to the power supply side of the lower-level leakage protection switch, for example, the protection range of the first leakage protection switch 12 may include the first circuit 13 and the second circuit 15, and the protection range of the second leakage protection switch 14 may include the second circuit 15 and the second circuit 17. When the functional state of the leakage protection switch is a failure state, the superior leakage protection switch of the leakage protection switch can be used for executing a leakage protection strategy instead to protect the line safety.
In this embodiment, the earth leakage protection action module 30 further includes an earth leakage protection switch determination sub-module 305, an earth leakage protection switch function confirmation sub-module 306, and a protection policy execution level determination sub-module 307. The upper-level leakage protection switch with the leakage protection switch of the nth switch level being J n,Jn is J n-1 (n is more than or equal to 2).
The leakage protection switch determining submodule 305 is used for determining a leakage protection switch J n with the lowest switch level in the leakage protection switch containing the protection range when leakage occurs in the protection range, the leakage protection switch function confirming submodule 306 is used for confirming the functional state of the leakage protection switch J n, and the protection strategy execution level determining submodule 307 is used for determining the leakage protection switch executing the protection strategy according to the functional state of the leakage protection switch J n.
Since both the leakage protection switch J n and the upper leakage protection switch J n-1 can protect the line on the load side of the leakage protection switch J n, in practice, when the line on the load side of the leakage protection switch J n leaks, only one of the leakage protection switches is needed to execute the leakage protection policy, and in view of the fact that when the upper leakage protection switch J n-1 executes the leakage protection policy, the line on the same level as the leakage protection switch J n and the line on the lower level of the leakage protection switch J n may be affected, the leakage protection policy may be executed by the leakage protection switch Jn preferentially.
Specifically, the protection policy enforcement level determination submodule 307 includes: the current-stage leakage protection switch execution unit is used for determining that the leakage protection switch J n executes the protection strategy when the functional state is in a normal state, and the upper-stage leakage protection switch execution unit is used for determining that the upper-stage leakage protection switch J n-1 of the leakage protection switch J n executes the protection strategy when the functional state is in a failure state.
When the functional state of the leakage protection switch J n is normal, it indicates that it can execute a correct protection strategy for the leakage current, and in order to reduce the power outage scope, the leakage protection switch J n executes the protection strategy. When the functional state of the leakage protection switch J n is a failure state, it indicates that it can not identify the type of the leakage current or can not execute a correct protection policy according to the leakage current, and in order to ensure the line safety, the leakage protection switch J n-1 executes the protection policy.
The upper and lower hierarchical relationship of the leakage protection switch according to the present invention may be set before or during installation of the leakage protection switch, or may be confirmed by receiving and/or transmitting the own hierarchical characteristics of the leakage protection switch after installation of the leakage protection switch or when leakage occurs.
In addition, after the hierarchical relationship of the upper and lower stages is set, action delay time can be set according to the upper and lower stage relationship between the leakage protection switches, specifically, when insulation damage leakage occurs and delay tripping action is performed, the delay time of the upper-stage leakage protection switch J n-1 can be longer than that of the lower-stage leakage protection switch J n, so that when the leakage protection switch J n trips due to circuit leakage on the load side, the leakage protection switch J n-1 is prevented from tripping, and the power failure range is prevented from being enlarged.
According to the embodiment of the invention, the protection range of the upper-level leakage protection switch comprises the load side of the lower-level leakage protection switch, when leakage occurs on the load side of the leakage protection switch, the leakage protection switch for executing the electric protection strategy is determined according to the functional state of the lower-level leakage protection switch, so that the leakage protection switch can be further ensured to play a role in protecting a circuit, and the circuit range influenced by executing the leakage protection strategy can be reduced as much as possible.
As shown in fig. 5, the leakage protection switch according to the embodiment of the present invention further includes a reclosing module 40, configured to reclose after the leakage protection switch trips, by delaying S3, so that after the transient line fault is cleared, the line can be reconnected to the power supply through reclosing, thereby reducing a power failure accident of the line caused by the transient fault, etc., and improving the power supply reliability, and on the other hand, no manual opening and closing operation is required for a worker, and manpower and material resources are saved. The reclosing module 40 is further configured to close the reclosing when the reclosing is tripped again, where the circuit trips again to indicate that the electric leakage or the fault in the circuit is not transient, and in order to ensure the circuit safety, the reclosing module 40 should trip to avoid the reclosing function of the reclosing module.
As shown in fig. 5, the leakage protection switch according to the embodiment of the present invention further includes a configuration module 50 and a storage module 60.
The configuration module 50 is configured to configure switching parameters, protection strategies, and preset current data of the leakage protection switch when the leakage type is human electric shock leakage or insulation damage leakage, where the switching parameters include at least one of protection action parameters, tripping current threshold, tripping delay time, switching hierarchy relationship, rated voltage, rated current, switching delay time, and reclosing delay action, for example, when the leakage protection switch is installed in a water park, the rated action current of the leakage protection switch for preventing human electric shock cannot be greater than 15mA or 30mA, and specifically, the settings of the above parameters are set according to requirements of protection range, personal equipment safety, environment, and the like.
The storage module 60 is used for storing the switching parameters, the protection strategy and the preset current data of the leakage protection switch; the storage module is also used for storing the operation parameters of the leakage protection switch.
According to the embodiment, when the leakage protection switch is installed, different switching parameters, preset current data and protection strategies can be configured according to lead materials, application places, environmental factors and the like of different lines, so that the judgment accuracy of the leakage protection switch on the line leakage is improved.
In an alternative embodiment, as shown in fig. 5, the earth leakage protection switch further includes a self-learning module 70 and a communication module 80.
The self-learning module 70 is used for updating operation data according to a protection strategy, and can evaluate the correctness or the fine degree of the leakage current data through environmental factors and the like in the system operation process, for example, when the leakage protection switch is applied to different scenes such as mines, seas and the like, the leakage protection switch can automatically learn and update preset current data according to factors such as environment, temperature, humidity and the like through the self-learning module, so that the fit degree of the preset current data and actual current data is improved, and the accuracy of judging the leakage type is further improved. On the other hand, the self-learning module 70 is further configured to store and update related data after the malfunction or refusal of the leakage protection switch, so as to analyze the cause of the malfunction or refusal of the leakage protection switch and improve the leakage protection switch. When an electric leakage occurs in the line, the related personnel can review the historical data and/or the preset current data, check whether the action of the electric leakage protection action module 30 is correct, correct if not, and store the related information in the storage medium so as to avoid the occurrence of incorrect actions, wherein the incorrect actions comprise: malfunction, refusal, reclosing, delay, alarm factors, etc.
The communication module 80 is configured to upload the updated preset current data to the server, store the preset current data by the server, and download the preset current data of the replaced leakage protection switch from the server without manually reconfiguring the preset current data of the new leakage protection switch when the leakage protection switch is damaged or lost and needs to be replaced with a new leakage protection switch. The respective earth leakage protection switches can communicate with each other through the communication module 80 to obtain the upper and lower relationships of the switches.
Further, the leakage protection switch according to the embodiment of the present invention further includes a leakage protection function locking module 90, configured to, when the failure of the comparison module is detected, take all the leakage types as human body electric shock leakage to execute a leakage protection action, and generate an alarm signal, that is, convert the leakage protection switch into a switch capable of executing only a tripping strategy, so that when the failure of the comparison module 20 occurs, the leakage protection switch can still protect the circuit according to whether there is leakage in the circuit, thereby avoiding serious consequences caused by misjudging the human body electric shock leakage as insulation damage leakage, improving the safety of the circuit, and improving the usability of the leakage protection switch.
Furthermore, the leakage protection switch of the embodiment of the invention further comprises a self-checking module 100 for generating an alarm signal when the failure of the leakage current detection module or the leakage protection action module is detected, wherein the self-checking module 100 can perform self-checking on the leakage current detection module or the leakage protection action module at regular time or after receiving an instruction of an operator so as to replace the unqualified leakage protection switch in time, thereby avoiding the situation of wrongly judging the leakage type and wrongly executing the leakage protection action, effectively ensuring the functional reliability of the leakage protection switch and saving manpower and material resources when detecting the function of the leakage protection switch.
Furthermore, the leakage protection switch according to the embodiment of the invention further comprises a temperature detection module (not shown) for detecting whether the temperature of the leakage protection switch is within a preset temperature range, so as to avoid the problem that the contacts of the leakage protection switch generate electric arcs with higher temperature when the circuit is opened and closed, thereby causing short circuit, fire, equipment explosion and the like to endanger the safety of personnel and equipment.
Example two
Fig. 6 is a flowchart of a leakage protection method according to a second embodiment of the present invention, where the method may be performed by the leakage protection switch according to the first embodiment, and the leakage protection method shown in fig. 6 specifically includes the following steps:
S601, detecting current flowing through the leakage protection switch to obtain leakage current data.
S602, comparing the leakage current data with preset current data to obtain a leakage type.
And S603, executing the leakage protection action according to the leakage type and a preset protection strategy.
In an alternative embodiment of the present invention, the leakage type includes human body electric shock leakage and insulation damage leakage, the leakage type is obtained by comparing leakage current data with preset current data, and the method includes:
And calculating the similarity between the leakage current data and preset current data.
And judging whether the similarity is in a preset value interval or not.
If the type of electric leakage is determined to be electric shock and electric leakage of a human body.
If the leakage type is not determined to be insulation damage leakage.
In an alternative embodiment of the present invention, the leakage type includes human body electric shock leakage and insulation damage leakage, and the performing the leakage protection action according to the leakage type and a preset protection policy includes:
judging whether the electric leakage type is electric shock and electric leakage of a human body.
If yes, determining that the protection strategy is tripping.
If not, calculating the leakage current value according to the leakage current data.
And determining a protection strategy according to the leakage current value.
Wherein, confirm the protection tactics according to the electric leakage current value, include:
when the leakage current value is less than a preset trip current threshold I1, the protection strategy is determined to be not tripped.
When the leakage current value is greater than or equal to a preset tripping current threshold value I2, determining that the protection strategy is tripping or tripping after delaying for S1 time.
When the leakage current value is greater than or equal to the trip current threshold I1 and less than the trip current threshold I2, the protection strategy is determined to trip after a delay S2 time.
Wherein S2 > S1 and I2 > I1.
In an optional embodiment of the present invention, the performing the leakage protection action according to the leakage type and a preset protection policy further includes: and generating an alarm signal when the leakage type is determined to be human electric shock leakage or insulation damage leakage.
In an alternative embodiment of the present invention, the leakage protection switch is divided into a plurality of different switch levels according to a protection range of the leakage protection switch, each switch level is provided with at least one leakage protection switch, and performs a leakage protection action according to a leakage type and a preset protection policy, and further includes:
when electric leakage occurs in the protection range, the electric leakage protection switch J n with the lowest switch level in the electric leakage protection switch containing the protection range is determined, the functional state of the electric leakage protection switch J n is confirmed, and the electric leakage protection switch for executing the protection strategy is determined according to the functional state of the electric leakage protection switch J n.
Wherein, confirm the earth leakage protection switch of executing the protection strategy according to the functional state of earth leakage protection switch J n, include: when the functional state is a normal state, it is determined that the protection strategy is executed by the earth leakage protection switch J n, and when the functional state is a failure state, it is determined that the protection strategy is executed by the upper earth leakage protection switch J n-1 of the earth leakage protection switch J n.
In an alternative embodiment of the present invention, after performing the leakage protection action according to the leakage type and the preset protection policy, the method further includes:
And after the leakage protection switch trips, the reclosing is carried out in a time delay S3, and the reclosing is locked when the tripping is carried out again after the reclosing.
In an alternative embodiment of the present invention, before comparing the leakage current data with the preset current data to obtain the leakage type, the method further includes:
The method comprises the steps of configuring switching parameters and protection strategies of a leakage protection switch, wherein the leakage type is preset current data when human body electric shock leakage and insulation damage leakage occur, and the switching parameters comprise at least one of protection action parameters, tripping current threshold values, tripping delay time, switching level relation, rated voltage, rated current, switching-on delay time and reclosing delay action.
Storing switching parameters, protection strategies and preset current data of the leakage protection switch; the storage module is also used for storing the operation parameters of the leakage protection switch.
In an alternative embodiment of the present invention, after performing the leakage protection action according to the leakage type and the preset protection policy, the method further includes:
And updating the operation data according to the protection strategy, and/or updating the operation data after the false action of the leakage protection switch or the refusal action of the leakage protection switch is manually corrected.
And uploading the updated operation data to a server.
In an alternative embodiment of the present invention, after performing the leakage protection action according to the leakage type and the preset protection policy, the method further includes:
When the failure of the comparison module is detected, all the leakage types are used as human body electric shock leakage to execute leakage protection action, and an alarm signal is generated.
In an alternative embodiment of the present invention, before detecting the current flowing through the leakage protection switch to obtain the leakage current data, the method further includes:
And generating an alarm signal when the failure of the leakage current detection module or the leakage protection action module is detected.
It should be noted that, for the method embodiment, since it is substantially similar to the system embodiment, the description is relatively simple, and the relevant points refer to the part of the description of the system embodiment.
The leakage protection method provided by the embodiment of the invention is applied to the leakage protection switch provided by the first embodiment of the invention, so that the leakage protection method has corresponding beneficial effects.
Example III
The third embodiment of the present invention further provides a computer readable storage medium having a computer program stored thereon, which when executed by a processor implements the earth leakage protection method of the second embodiment of the present invention.
It should be noted that, for the method and storage medium embodiments, since they are substantially similar to the system embodiments, the description is relatively simple, and the relevant points refer to part of the description of the system embodiments.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (RandomAccess Memory, RAM), a FLASH Memory (FLASH), a hard disk, or an optical disk of a computer, or may include several instructions for causing a computer device (which may be a personal computer, a server, a leakage protection switch, or a network device, etc.) to perform the leakage protection method of the embodiments of the present invention.
It should be noted that, in the above embodiment of the leakage protection switch, each unit and module included are only divided according to the functional logic, but not limited to the above division, so long as the corresponding function can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (11)
1. A leakage protection switch, comprising:
The leakage current detection module (10) is used for detecting the current flowing through the leakage protection switch to obtain leakage current data;
The comparison module (20) is used for comparing the leakage current data with preset current data to obtain a leakage type;
The leakage protection action module (30) is used for executing leakage protection action according to the leakage type and a preset protection strategy;
The electric leakage type comprises human body electric shock electric leakage and insulation damage electric leakage, and the comparison module (20) comprises:
A similarity calculation submodule (201) for calculating the similarity between the leakage current data and the preset current data;
a judging sub-module (202) for judging whether the similarity is in a preset value interval;
The human body electric shock and electric leakage determining sub-module (203) is used for determining that the electric leakage type is human body electric shock and electric leakage when the similarity is in a preset value interval;
an insulation damage electric leakage determination submodule (204) for determining that the electric leakage type is insulation damage electric leakage when the similarity is outside a preset value interval;
the electric leakage type comprises human body electric shock electric leakage and insulation damage electric leakage, and the electric leakage protection action module (30) comprises:
a human body electric shock and leakage protection action sub-module (301) for determining that a protection strategy is tripping when the leakage type is human body electric shock and leakage;
an insulation damage leakage current value calculation sub-module (302) for calculating a leakage current value according to the leakage current data when the leakage type is insulation damage leakage;
An insulation damage leakage protection action sub-module (303) for determining a protection strategy according to the leakage current value;
wherein determining a protection strategy according to the leakage current value includes:
when the leakage current value is smaller than a preset tripping current threshold value I1, determining a protection strategy to be not tripped;
When the leakage current value is greater than or equal to a preset tripping current threshold I2, determining a protection strategy to trip or trip after delaying for S1 time;
when the leakage current value is larger than or equal to the tripping current threshold value I1 and smaller than the tripping current threshold value I2, determining that the protection strategy is tripping after delaying for S2 time;
Wherein S2 > S1 and I2 > I1.
2. The earth leakage protection switch of claim 1, wherein the earth leakage protection action module (30) further comprises:
And the alarm sub-module (304) is used for generating an alarm signal when the leakage type is determined to be human electric shock leakage or insulation damage leakage.
3. The earth leakage protection switch according to claim 1, characterized in that the earth leakage protection switch is divided into a plurality of different switch levels according to the protection range of the earth leakage protection switch, each of the switch levels being provided with at least one of the earth leakage protection switches,
The earth leakage protection action module (30) further comprises:
A leakage protection switch determining sub-module (305) for determining, when leakage occurs in a protection range, a leakage protection switch J n with the lowest switch level in the leakage protection switch including the protection range;
A leakage protection switch function confirmation sub-module (306) for confirming the functional state of the leakage protection switch J n;
And the protection strategy execution level determination submodule (307) is used for determining the electric leakage protection switch for executing the protection strategy according to the functional state of the electric leakage protection switch J n.
4. A leakage protection switch according to claim 3, characterized in that the protection policy enforcement level determination submodule (307) comprises:
the current-stage leakage protection switch executing unit is used for determining that the leakage protection switch J n executes a protection strategy when the functional state is a normal state;
And the upper-level leakage protection switch executing unit is used for determining that the upper-level leakage protection switch J n-1 of the leakage protection switch J n executes a protection strategy when the functional state is a failure state.
5. The earth leakage protection switch of claim 1, further comprising:
and the reclosing module (40) is used for carrying out reclosing in a time delay S3 after the tripping of the leakage protection switch and locking the reclosing when the tripping is carried out again after the reclosing.
6. The earth leakage protection switch of claim 1, further comprising:
The configuration module (50) is used for configuring the switching parameters, the protection strategy and the leakage type of the leakage protection switch to be preset current data when human body electric shock and leakage and insulation damage occur, wherein the switching parameters comprise at least one of protection action parameters, tripping current threshold values, tripping delay time, switch hierarchy relation, rated voltage, rated current, closing delay time and reclosing delay action;
the storage module (60) is used for storing the switching parameters of the leakage protection switch, the protection strategy and the preset current data; the storage module is also used for storing the operation parameters of the leakage protection switch.
7. The earth leakage protection switch of claim 5, further comprising:
The self-learning module (70) is used for updating the operation data according to the protection strategy and/or updating the operation data after the false action of the leakage protection switch or the refusal action of the leakage protection switch is manually corrected;
And the communication module (80) is used for uploading the updated operation data to a server.
8. The earth leakage protection switch of any one of claims 1-7, further comprising:
and the leakage protection function locking module (90) is used for executing leakage protection action by taking all leakage types as human body electric shock leakage when the comparison module is detected to be invalid, and generating an alarm signal.
9. The earth leakage protection switch of any one of claims 1-7, further comprising:
And the self-checking module (100) is used for generating an alarm signal when the leakage current detection module or the leakage protection action module is detected to be invalid.
10. A leakage protection method applied to the leakage protection switch according to any one of claims 1 to 9, the leakage protection method comprising:
detecting the current flowing through the leakage protection switch to obtain leakage current data;
comparing the leakage current data with preset current data to obtain a leakage type;
and the leakage protection action is executed according to the leakage type and a preset protection strategy.
11. A computer readable storage medium, characterized in that the computer readable storage medium stores thereon a computer program, which when executed by a processor, implements the earth leakage protection method according to claim 10.
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