A leakage protection method, device and equipment based on the maximum current that the human body can withstand

Abstract

The present invention relates to the field of low-voltage line leakage protection, and provides a leakage protection method, device and equipment based on the maximum current that a human body can withstand, comprising: obtaining a residual current amplitude; judging whether the residual current amplitude is greater than at least one current threshold, and if so, obtaining a time threshold corresponding to the satisfied current threshold, and obtaining a duration of the residual current amplitude; judging whether the amplitude and duration of the residual current are greater than a time threshold corresponding to the current threshold while satisfying the current threshold, and if so, executing a corresponding protection action; by setting the current threshold and time threshold that a human body can withstand, the action time of the leakage protection is made more reasonable, thereby increasing the reliability of power supply.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage line leakage protection, and in particular to a leakage protection method, device and equipment based on the maximum current that a human body can withstand. Background Art

[0002] In the prior art, leakage protection is generally used to protect people's lives in the event of leakage accidents, but its action time can only be selected from 0.2, 0.4, 0.8, 1, 1.5 and 2s, and the constant value of the residual current is generally set to 30mA according to the safety current of the human body.

[0003] However, when the residual current is large, even if 0.2s is selected as the action time, it is too long and will cause serious harm to the body of the person who is electrocuted; and when the residual current is small, if 0.2s is still selected as the action time, it will be too sensitive, increasing the probability of power outage and reducing the reliability of power supply. Summary of the invention

[0004] The invention provides a leakage protection method based on the maximum bearing current of a human body, which is used to solve the technical problem of unreasonable leakage protection action time in leakage accidents.

[0005] The first aspect of the present invention provides a leakage protection method based on the maximum current that a human body can withstand, comprising:

[0006] Obtaining residual current amplitude;

[0007] Determine whether the residual current amplitude is greater than at least one current threshold value, and if so, obtain the time threshold value corresponding to the satisfied current threshold value, and obtain the duration of the residual current amplitude value; the current threshold value includes: a first current threshold value, a second current threshold value and a third current threshold value, and the first current threshold value is greater than the second current threshold value, and the second current threshold value is greater than the third current threshold value; the third time threshold value corresponding to the third current threshold value is the difference between the maximum time that the human body can withstand the current of the second current threshold value and the relay action time, the second time threshold value corresponding to the second current threshold value is the difference between the maximum time that the human body can withstand the current of the first current threshold value and the relay action time, and the first time threshold value corresponding to the first current threshold value is the difference between the maximum time that the human body can withstand the current of a preset multiple of the first current threshold value and the relay action time;

[0008] It is determined whether the amplitude and duration of the residual current meet the current threshold and are greater than the time threshold corresponding to the current threshold. If so, the corresponding protection action is executed.

[0009] Optionally, after obtaining the time threshold corresponding to the satisfied current threshold and obtaining the duration of the residual current amplitude, the method further includes:

[0010] The current threshold and the time threshold satisfy the human body's maximum current tolerance model, and the human body's maximum current tolerance model is specifically:

[0011]

[0012] In the formula, I set is the current threshold, t is the time threshold, t0 is the relay action time, K f is the reliability coefficient.

[0013] Optionally, after obtaining the time threshold corresponding to the satisfied current threshold and obtaining the duration of the residual current amplitude, the method further includes:

[0014] Determine whether the residual current amplitude is greater than the inverse time protection current threshold. If so, calculate the corresponding inverse time protection time threshold according to the residual current amplitude; the inverse time protection current threshold is a preset multiple of the first current threshold.

[0015] Optionally, the corresponding inverse time protection time threshold is calculated according to the residual current amplitude, specifically:

[0016] Substituting the residual current amplitude into the inverse time protection model to obtain the inverse time protection time threshold;

[0017] The inverse time protection model is specifically:

[0018]

[0019] Where, t4 is the inverse time protection threshold, t0 is the relay action time, I n is the residual current amplitude, K a is the threshold current coefficient.

[0020] Optionally, after calculating the corresponding inverse time protection time threshold according to the residual current amplitude, the method further includes:

[0021] It is determined whether the amplitude and duration of the residual current meet the inverse time protection current threshold and are greater than the inverse time protection time threshold corresponding to the residual current amplitude. If so, a tripping action is performed.

[0022] Optionally, the execution of the corresponding protection action is specifically:

[0023] A time threshold that the duration is greater than is identified. If it is the first time threshold or the second time threshold, a tripping action is performed; if it is the third time threshold, an alarm action is performed.

[0024] The second aspect of the present application provides a leakage protection device based on the maximum current that a human body can withstand, comprising:

[0025] A residual current data acquisition module is used to obtain the residual current amplitude;

[0026] A time threshold acquisition module, used to determine whether the residual current amplitude is greater than at least one current threshold, and if so, obtain the time threshold corresponding to the satisfied current threshold, and obtain the duration of the residual current amplitude; the current threshold includes: a first current threshold, a second current threshold and a third current threshold, and the first current threshold is greater than the second current threshold, and the second current threshold is greater than the third current threshold; the third time threshold corresponding to the third current threshold is the difference between the maximum time that the human body can withstand the current of the second current threshold and the relay action time, the second time threshold corresponding to the second current threshold is the difference between the maximum time that the human body can withstand the current of the first current threshold and the relay action time, and the first time threshold corresponding to the first current threshold is the difference between the maximum time that the human body can withstand the current of a preset multiple of the first current threshold and the relay action time;

[0027] The protection action execution module is used to determine whether the amplitude and duration of the residual current meet the current threshold and are greater than the time threshold corresponding to the current threshold. If so, the corresponding protection action is executed.

[0028] Optionally, in the time threshold acquisition module, after acquiring the time threshold corresponding to the current threshold satisfied by the residual current amplitude, the module further includes:

[0029] The current threshold and the time threshold satisfy the human body's maximum current tolerance model, and the human body's maximum current tolerance model is specifically:

[0030]

[0031] In the formula, I set is the current threshold, t is the time threshold, t0 is the relay action time, K f is the reliability coefficient.

[0032] Optionally, after obtaining the time threshold corresponding to the satisfied current threshold and obtaining the duration of the residual current amplitude, the method further includes:

[0033] Determine whether the residual current amplitude is greater than the inverse time protection current threshold. If so, calculate the corresponding inverse time protection time threshold according to the residual current amplitude; the inverse time protection current threshold is a preset multiple of the first current threshold.

[0034] A third aspect of the present application provides a leakage protection device based on the maximum current that a human body can withstand, the device comprising a processor and a memory:

[0035] The memory is used to store program code and transmit the program code to the processor;

[0036] The processor is used to execute the leakage protection method based on the maximum current that the human body can withstand as described in any one of the first aspects of the present invention according to the instructions in the program code.

[0037] It can be seen from the above technical scheme that the present invention has the following advantages: obtaining the residual current amplitude; judging whether the residual current amplitude is greater than at least one current threshold, if so, obtaining the time threshold corresponding to the satisfied current threshold, and obtaining the duration of the residual current amplitude; the current threshold includes: a first current threshold, a second current threshold and a third current threshold, and the first current threshold is greater than the second current threshold, and the second current threshold is greater than the third current threshold; the third time threshold corresponding to the third current threshold, the second time threshold corresponding to the second current threshold, and the first time threshold corresponding to the first current threshold, and the time threshold is the difference between the maximum time that the human body can withstand the corresponding current and the relay action time; judging whether the amplitude and duration of the residual current are greater than the time threshold corresponding to the current threshold while satisfying the current threshold, and if so, executing the corresponding protection action; by setting the current threshold and time threshold that meet the current that the human body can withstand, the action time of the leakage protection is more reasonable, and the power supply reliability is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 It is a flow chart of a leakage protection method based on the maximum current that the human body can withstand;

[0040] Figure 2 A flow chart for obtaining a current threshold value of a leakage protection method based on the maximum current that a human body can withstand;

[0041] Figure 3 It is an action flow chart of a leakage protection method based on the maximum current that the human body can withstand;

[0042] Figure 4 It is a general flow chart of a leakage protection method based on the maximum current that the human body can withstand;

[0043] Figure 5 This is a diagram of a leakage protection device based on the maximum current that the human body can withstand. DETAILED DESCRIPTION

[0044] The invention provides a leakage protection method based on the maximum bearing current of a human body, which is used to solve the technical problem of unreasonable leakage protection action time in leakage accidents.

[0045] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] See also Figure 1 , Figure 1 A flow chart of a leakage protection method based on the maximum current that a human body can withstand is provided in an embodiment of the present invention. The present invention provides a leakage protection method based on the maximum current that a human body can withstand, comprising:

[0047] S100, obtaining the residual current amplitude;

[0048] It should be noted that step S100 is to obtain the residual current amplitude in real time, and in subsequent steps the obtained data is continuously judged.

[0049] S200, determine whether the residual current amplitude is greater than at least one current threshold, and if so, obtain the time threshold corresponding to the satisfied current threshold, and obtain the duration of the residual current amplitude; the current threshold includes: a first current threshold, a second current threshold and a third current threshold, and the first current threshold is greater than the second current threshold, and the second current threshold is greater than the third current threshold; the third time threshold corresponding to the third current threshold is the difference between the maximum time that the human body can withstand the current of the second current threshold and the relay action time, the second time threshold corresponding to the second current threshold is the difference between the maximum time that the human body can withstand the current of the first current threshold and the relay action time, and the first time threshold corresponding to the first current threshold is the difference between the maximum time that the human body can withstand the current of a preset multiple of the first current threshold and the relay action time;

[0050] It should be noted that the residual current amplitude obtained can be greater than multiple current thresholds, so multiple time thresholds can be obtained;

[0051] Furthermore, the third current threshold is calculated based on the second current threshold to ensure the reliability of leakage protection when the residual current is greater than the third current threshold and less than the second current threshold. It is set based on the maximum current in the range, that is, the current of the second current threshold. The same is true for other time thresholds. The preset multiple of the first current threshold is generally set to 1.5-2 times, which is set according to actual conditions.

[0052] Furthermore, when considering the time threshold based on the maximum current that the human body can withstand, the action time of the relay also needs to be considered, that is, the time threshold plus the action time of the relay is less than the time corresponding to the current that the human body can withstand, so as to ensure human safety. The maximum action time of the solid-state relay used in this embodiment is about 20ms, and it can be set according to the actual action time of the relay during actual setting.

[0053] Further, the first current threshold, the second current threshold and the third current threshold, as well as the first time threshold, the second time threshold and the third time threshold in step S200 are all preset, and can be set by the staff firstly setting the time threshold and then calculating the current threshold accordingly according to the actual needs of the relay protection, or the current threshold can be set firstly and then calculating the time threshold accordingly;

[0054] Furthermore, the first time threshold, the second time threshold and the third time threshold set in this embodiment correspond to three-stage protection, which matches the three-stage protection commonly used in leakage protection in the prior art. Therefore, our time threshold and current threshold can be set directly in the existing three-stage leakage protection, avoiding the need to adapt the generation equipment, saving costs, and increasing the universality of this method.

[0055] S300, determining whether the amplitude and duration of the residual current meet the current threshold and are greater than the time threshold corresponding to the current threshold. If so, executing the corresponding protection action.

[0056] It should be noted that in the aforementioned step S200, the time threshold corresponding to the satisfied current threshold is obtained. At this time, there may be multiple time thresholds, and the larger the current threshold, the smaller the corresponding time threshold. Therefore, when the residual current satisfies multiple current thresholds, the duration will first satisfy the time threshold corresponding to the largest current threshold; and based on the actual acquisition situation, the residual current may fluctuate. If the duration of the residual current does not satisfy the time threshold corresponding to the maximum current threshold, the amplitude of the residual current has been reduced to below the maximum current threshold. At this time, it is also possible to continue to determine whether the time threshold corresponding to the next-level current threshold is satisfied. If it is satisfied, the corresponding protection action can be executed; if the residual current duration has dropped below each current threshold before it is greater than the time threshold, the conditions for executing the protection action are no longer met, and the residual current data can continue to be monitored, waiting for the judgment that the lower segment of the residual current amplitude is greater than the current threshold.

[0057] In this embodiment, by obtaining the residual current amplitude; judging whether the residual current amplitude is greater than at least one current threshold, if so, obtaining the time threshold corresponding to the satisfied current threshold, and obtaining the duration of the residual current amplitude; the current threshold includes: a first current threshold, a second current threshold and a third current threshold, and the first current threshold is greater than the second current threshold, and the second current threshold is greater than the third current threshold; the third time threshold corresponding to the third current threshold, the second time threshold corresponding to the second current threshold, and the first time threshold corresponding to the first current threshold, and the time threshold is the difference between the maximum time that the human body can withstand the corresponding current and the relay action time; judging whether the amplitude and duration of the residual current are greater than the time threshold corresponding to the current threshold while satisfying the current threshold, and if so, executing the corresponding protection action; judging the duration and executing the corresponding protection action; by setting the current threshold and time threshold that the human body can withstand, the action time of the leakage protection is more reasonable, the power supply reliability is increased, the three-stage protection is more universal, and the cost of production application is reduced.

[0058] The above is a detailed description of the first embodiment of a leakage protection method based on the maximum current that the human body can withstand provided by the present application. The following is a detailed description of the second embodiment of a leakage protection method based on the maximum current that the human body can withstand provided by the present application.

[0059] See also Figure 2 , Figure 2 A flow chart of current threshold acquisition of a leakage protection method based on the maximum current that a human body can withstand provided by an embodiment of the present invention;

[0060] Step S200 of the above embodiment is specifically as follows:

[0061] S210, determining whether the residual current amplitude is greater than at least one current threshold, if so, proceeding to step S220, if not, returning to step S100;

[0062] It should be noted that if the residual current amplitude is less than the third current threshold, in order to ensure power supply reliability, return to step S100 to continue to collect residual current data in real time; if it is greater than at least one current threshold, that is, as long as the residual current amplitude is greater than the third current threshold, a leakage protection judgment is required.

[0063] S220, obtaining a time threshold corresponding to a current threshold satisfied by the residual current amplitude.

[0064] It should be noted that the current threshold includes: a first current threshold, a second current threshold, a third current threshold and an inverse time protection current threshold, and the first current threshold is greater than the second current threshold, the second current threshold is greater than the third current threshold, and the inverse time protection current threshold is a preset multiple of the first current threshold; the third time threshold corresponding to the third current threshold is the difference between the maximum time that the human body can withstand the current of the second current threshold and the relay action time, the second time threshold corresponding to the second current threshold is the difference between the maximum time that the human body can withstand the current of the first current threshold and the relay action time, and the first time threshold corresponding to the first current threshold is the difference between the maximum time that the human body can withstand the current of the preset multiple of the first current threshold and the relay action time;

[0065] Furthermore, the preset multiple first current threshold is generally set to 1.5-2 times, which is set according to actual conditions;

[0066] The preset current threshold and voltage threshold meet the human body maximum bearing current model, and the human body maximum bearing current model is specifically:

[0067]

[0068] In the formula, I set is the current threshold, t is the time threshold, t0 is the relay action time, K f is the reliability coefficient.

[0069] Furthermore, in this embodiment, the first current threshold value is 400mA, the second current threshold value is 200mA, and the third current threshold value is 80mA. They can be set according to actual conditions, but for more serious general leakage accidents, the third current threshold value is preferably 50mA or above.

[0070] Furthermore, step S220 may acquire multiple time thresholds.

[0071] S230, determining whether the residual current amplitude is greater than the inverse time protection current threshold, if so, proceeding to step S240, if not, proceeding to step S300;

[0072] It should be noted that the inverse time protection current threshold is set to a preset multiple of the first current amplitude, generally set to 1.5-2 times, and is set according to actual conditions; if inverse time protection is not required, there is no need to calculate the inverse time protection time threshold corresponding to the residual current amplitude, and the time threshold obtained in step S220 can be directly used for judgment.

[0073] S240, calculating a corresponding inverse time protection time threshold according to the residual current amplitude;

[0074] It should be noted that the inverse time protection time threshold is dynamically set according to the residual current amplitude by inverse time protection. The inverse time protection model is specifically as follows:

[0075]

[0076] Where, t4 is the inverse time protection threshold, t0 is the relay action time, I n is the residual current amplitude, K a is the threshold current coefficient, K f is the reliability coefficient. The smaller the reliability coefficient is, the smaller the corresponding time threshold value is, and the more sensitive the leakage protection is. In this embodiment, the value of the reliability coefficient is 0.8, and it can be set according to actual needs in actual protection.

[0077] Furthermore, the current threshold coefficient is set according to a current threshold coefficient model, and the current threshold coefficient model is specifically:

[0078]

[0079] Wherein, t1 is the first time threshold, I1 is the first current threshold; in this embodiment, by judging the current threshold satisfied by the amplitude of the residual current, the corresponding time threshold is obtained, and the time threshold satisfies the human body's maximum current tolerance model, and when the residual current is large, the inverse time protection is adopted to further speed up the action, thereby increasing the rationality and reliability of the leakage protection action time setting.

[0080] The above is a detailed description of the second embodiment of a leakage protection method based on the maximum current that the human body can withstand provided by the present application. The following is a detailed description of the third embodiment of a leakage protection method based on the maximum current that the human body can withstand provided by the present application.

[0081] See also Figure 3 , Figure 3 An action flow chart of a leakage protection method based on the maximum current that a human body can withstand provided by an embodiment of the present invention;

[0082] In step S300 of the above embodiment, it is determined whether the amplitude and duration of the residual current meet the current threshold and are greater than the time threshold corresponding to the current threshold. If so, the corresponding protection action is performed, specifically:

[0083] S310, determine whether the duration that the residual current amplitude is greater than the inverse time protection current threshold is greater than the inverse time protection time threshold, if so, proceed to step S350, if not, proceed to step S320.

[0084] S320, determine whether the duration that the residual current amplitude is greater than the first current threshold is greater than the first time threshold, if so, proceed to step S350, if not, proceed to step S330.

[0085] It should be noted that a current greater than the first current threshold reflects a serious leakage situation;

[0086] S330, determine whether the duration that the residual current amplitude is greater than the second current threshold is greater than the second time threshold, if so, proceed to step S350, if not, proceed to step S330.

[0087] It should be noted that a current greater than the second current threshold reflects a more serious leakage situation;

[0088] S340, determining whether the duration that the residual current amplitude is greater than the third current threshold is greater than the third time threshold, if so, proceeding to step S360, if not, returning to step S100.

[0089] It should be noted that a current greater than the third current threshold reflects a slight leakage;

[0090] S350, executing the tripping action.

[0091] S360, executing the alarm issuing action.

[0092] Furthermore, the judgment in this embodiment is based on the time threshold obtained in the aforementioned step S200 and the inverse time protection time threshold, and is judged in order of priority from small to large, and the threshold that has not been obtained does not need to be judged.

[0093] For further information, see Figure 4 , Figure 4 A general flow chart of a leakage protection method based on the maximum current that a human body can withstand is provided in an embodiment of the present invention. Figure 4 The contents of the steps in the above-mentioned embodiments can refer to the corresponding processes in the above-mentioned embodiments, which will not be repeated here.

[0094] In this embodiment, by judging the duration based on multiple or single time thresholds and performing corresponding protection actions, the rationality of the action time under each current threshold time threshold is ensured, and the reliability of the line is ensured.

[0095] The above is a detailed description of the third embodiment of a leakage protection method based on the maximum current that the human body can withstand provided by the present application. The following is a detailed description of a leakage protection device based on the maximum current that the human body can withstand provided by the second aspect of the present application.

[0096] See also Figure 5 , Figure 5 This embodiment provides a leakage protection device based on the maximum current that the human body can withstand, including:

[0097] A residual current data acquisition module 10 is used to obtain the residual current amplitude;

[0098] The time threshold acquisition module 20 is used to determine whether the residual current amplitude is greater than at least one current threshold. If so, the time threshold corresponding to the satisfied current threshold is obtained, and the duration of the residual current amplitude is obtained; the current threshold includes: a first current threshold, a second current threshold and a third current threshold, and the first current threshold is greater than the second current threshold, and the second current threshold is greater than the third current threshold; the third time threshold corresponding to the third current threshold is the difference between the maximum time that the human body can withstand the current of the second current threshold and the relay action time, the second time threshold corresponding to the second current threshold is the difference between the maximum time that the human body can withstand the current of the first current threshold and the relay action time, and the first time threshold corresponding to the first current threshold is the difference between the maximum time that the human body can withstand the current of a preset multiple of the first current threshold and the relay action time;

[0099] The protection action execution module 30 is used to determine whether the amplitude and duration of the residual current meet the current threshold and are greater than the time threshold corresponding to the current threshold. If so, the corresponding protection action is executed.

[0100] Furthermore, in the time threshold acquisition module 20, after acquiring the time threshold corresponding to the current threshold satisfied by the residual current amplitude, the module further includes:

[0101] The current threshold and the time threshold satisfy the human body's maximum current tolerance model, and the human body's maximum current tolerance model is specifically:

[0102]

[0103] In the formula, I set is the current threshold, t is the time threshold, t0 is the relay action time, K f is the reliability coefficient.

[0104] Furthermore, in the time threshold acquisition module 20, after acquiring the time threshold corresponding to the satisfied current threshold and acquiring the duration of the residual current amplitude, the following steps are included:

[0105] Determine whether the residual current amplitude is greater than the inverse time protection current threshold. If so, calculate the corresponding inverse time protection time threshold according to the residual current amplitude; the inverse time protection current threshold is a preset multiple of the first current threshold.

[0106] The third aspect of the present application also provides a leakage protection device based on the maximum current that the human body can withstand, including a processor and a memory: the memory is used to store program code and transfer the program code to the processor; the processor is used to execute the above-mentioned leakage protection method based on the maximum current that the human body can withstand according to the instructions in the program code.

[0107] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0108] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0109] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0110] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0111] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0112] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A leakage protection method based on the maximum current that the human body can withstand, characterized in that: include: Obtaining residual current amplitude; Determine whether the residual current amplitude is greater than at least one current threshold, and if so, obtain a time threshold corresponding to the satisfied current threshold, and obtain a duration of the residual current amplitude; The current threshold includes: a first current threshold, a second current threshold and a third current threshold, and the first current threshold is greater than the second current threshold, and the second current threshold is greater than the third current threshold; The third time threshold corresponding to the third current threshold is the difference between the maximum time that the human body can withstand the current of the second current threshold and the relay action time, the second time threshold corresponding to the second current threshold is the difference between the maximum time that the human body can withstand the current of the first current threshold and the relay action time, and the first time threshold corresponding to the first current threshold is the difference between the maximum time that the human body can withstand the current of a preset multiple of the first current threshold and the relay action time; It is determined whether the amplitude and duration of the residual current meet the current threshold and are greater than the time threshold corresponding to the current threshold. If so, the corresponding protection action is executed.

2. A leakage protection method based on the maximum current that a human body can withstand according to claim 1, characterized in that: After obtaining the time threshold corresponding to the satisfied current threshold and obtaining the duration of the residual current amplitude, the method further includes: The current threshold and the time threshold satisfy the human body's maximum current tolerance model, and the human body's maximum current tolerance model is specifically: In the formula, I set is the current threshold, t is the time threshold, t0 is the relay action time, K f is the reliability coefficient.

3. The leakage protection method based on the maximum current that the human body can withstand according to claim 1 is characterized in that: After obtaining the time threshold corresponding to the satisfied current threshold and obtaining the duration of the residual current amplitude, the method further comprises: Determine whether the residual current amplitude is greater than the inverse time protection current threshold. If so, calculate the corresponding inverse time protection time threshold according to the residual current amplitude; the inverse time protection current threshold is a preset multiple of the first current threshold.

4. A leakage protection method based on the maximum current that a human body can withstand according to claim 3, characterized in that: The corresponding inverse time protection time threshold is calculated according to the residual current amplitude, specifically: Substituting the residual current amplitude into the inverse time protection model to obtain the inverse time protection time threshold; The inverse time protection model is specifically: Where t4 is the inverse time protection threshold, t0 is the relay action time, K f is the reliability coefficient, I n is the residual current amplitude, K a is the threshold current coefficient.

5. The leakage protection method based on the maximum current that the human body can withstand according to claim 3 is characterized in that: After calculating the corresponding inverse time protection time threshold according to the residual current amplitude, the method further includes: It is determined whether the amplitude and duration of the residual current meet the inverse time protection current threshold and are greater than the inverse time protection time threshold corresponding to the residual current amplitude. If so, a tripping action is performed.

6. The leakage protection method based on the maximum current that the human body can withstand according to claim 1 is characterized in that: The protection actions corresponding to the execution are specifically: A time threshold that the duration is greater than is identified. If it is the first time threshold or the second time threshold, a tripping action is performed; if it is the third time threshold, an alarm action is performed.

7. A leakage protection device based on the maximum current that the human body can withstand, characterized in that: include: A residual current data acquisition module is used to obtain the residual current amplitude; A time threshold acquisition module is used to determine whether the residual current amplitude is greater than at least one current threshold, and if so, to obtain the time threshold corresponding to the satisfied current threshold and the duration of the residual current amplitude; The current threshold includes: a first current threshold, a second current threshold and a third current threshold, and the first current threshold is greater than the second current threshold, and the second current threshold is greater than the third current threshold; the third time threshold corresponding to the third current threshold is the difference between the maximum time that the human body can withstand the current of the second current threshold and the relay action time, the second time threshold corresponding to the second current threshold is the difference between the maximum time that the human body can withstand the current of the first current threshold and the relay action time, and the first time threshold corresponding to the first current threshold is the difference between the maximum time that the human body can withstand the current of a preset multiple of the first current threshold and the relay action time; The protection action execution module is used to determine whether the amplitude and duration of the residual current meet the current threshold and are greater than the time threshold corresponding to the current threshold. If so, the corresponding protection action is executed.

8. The leakage protection device based on the maximum current that the human body can withstand according to claim 7, characterized in that: In the time threshold acquisition module, after acquiring the time threshold corresponding to the current threshold satisfied by the residual current amplitude, the module further includes: The current threshold and the time threshold satisfy the human body's maximum current tolerance model, and the human body's maximum current tolerance model is specifically: In the formula, I set is the current threshold, t is the time threshold, t0 is the relay action time, K f is the reliability coefficient.

9. The leakage protection device based on the maximum current that the human body can withstand according to claim 7, characterized in that: After obtaining the time threshold corresponding to the satisfied current threshold and obtaining the duration of the residual current amplitude, the method further comprises: Determine whether the residual current amplitude is greater than the inverse time protection current threshold. If so, calculate the corresponding inverse time protection time threshold according to the residual current amplitude; the inverse time protection current threshold is a preset multiple of the first current threshold.

10. A leakage protection device based on the maximum current that the human body can withstand, characterized in that: The device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the leakage protection method based on the maximum current that the human body can withstand according to the instructions in the program code as described in any one of claims 1-6.

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