Working state detection method, system and storage medium for leakage detection device

Abstract

The present application relates to the technical field of equipment monitoring, and discloses a working state detection method, system and storage medium for a leakage detection device. First, a phase branch in a three-phase circuit is selected as the branch to be tested, and a detection branch is set to short-circuit or shunt it. The connection point between the two is on one side of the zero-sequence current transformer, and the detection branch does not pass through the transformer. Then the detection branch is controlled to short-circuit or shunt the tested branch and continue for the first stable period of time. If the leakage detection device does not have a preset leakage signal, a failure alarm prompt is issued, and if there is a normal prompt, a normal prompt is output. Then, according to the preset pulse frequency, a pulse operation is performed within the control period, and the number of pulses and the number of leakage signal triggers are recorded, and the percentage of the ratio of the two is calculated, that is, the trigger percentage. If the trigger percentage is less than the reference percentage, a failure warning prompt is output, and if it is greater than the reference percentage, a normal prompt is output, and the length of the control period is adjusted according to the high and low anti-correlation, and the pulse frequency is adjusted according to the positive correlation. The present application can detect whether there is a failure in the leakage detection circuit or device.

Description

Technical Field

[0001] The present application relates to the technical field of equipment monitoring, and in particular to a working status detection method, system and storage medium for a leakage detection device. Background Art

[0002] Leakage detection circuits or devices are devices used to monitor whether there is leakage in electrical systems. They are essential to ensure the safety of electrical equipment and personnel. The principle of leakage detection circuits is generally to monitor the current of the live wire and the neutral wire. Under normal circumstances, the current of the live wire and the neutral wire is equal. If there is leakage, the current will flow through other paths (such as the ground), resulting in current imbalance and triggering the protector to trip. The components of the leakage detection circuit include zero-sequence current transformer (sensing part), operation controller (control part) and electromagnetic release (action execution part). Some leakage detection circuits use light indicators or sound indicators as the action execution part to provide light or sound prompts for leakage conditions.

[0003] As leakage detection circuits or devices work for a long time in harsh industrial environments, internal components may age or be affected by environmental interference, causing the leakage detection circuit or device to fail, resulting in false triggering or non-triggering of the leakage detection circuit or device, thereby affecting the user's experience and posing a major threat to the user's life safety. Summary of the invention

[0004] In order to detect whether a leakage detection circuit or device has failed, the present application provides a working status detection method, system and storage medium for a leakage detection device.

[0005] In a first aspect, the present application provides a method for detecting the working state of a leakage detection device, which adopts the following technical solution:

[0006] A method for detecting the working state of a leakage detection device comprises the following steps:

[0007] Based on arbitrarily selecting a branch of one phase in a three-phase line as a measured branch, a detection branch is arranged next to the measured branch, the detection branch is used to short-circuit or shunt the measured branch, and the connection point between the measured branch and the detection branch is located on one side of a zero-sequence current transformer, so that after the measured branch is short-circuited or shunted by the detection branch, no current passes through the part of the measured branch passing through the zero-sequence current transformer or the passing current is reduced; the detection branch does not pass through the zero-sequence current transformer;

[0008] Controlling the detection branch to short-circuit or shunt the detected branch for a set first stable time, and issuing a failure alarm prompt if the leakage detection device does not output a preset leakage signal;

[0009] If the leakage detection device outputs a preset leakage signal, a normal prompt is output, and then, according to a preset pulse frequency, within a preset control period, the detection branch is controlled to pulse-type short-circuit or shunt the tested branch, and the number of times the tested branch is short-circuited or shunted is recorded as the number of pulses; the number of times the leakage signal output by the leakage detection device within the control period is obtained as the number of triggers;

[0010] Calculating the ratio of the number of trigger times to the number of pulses, and taking the percentage of the ratio as the trigger percentage;

[0011] If the trigger percentage is less than the preset reference percentage, a failure warning prompt is output;

[0012] If the trigger percentage is greater than the preset reference percentage, a normal prompt is output, and the length of the control period in the next detection step is adjusted inversely according to the trigger percentage; the higher the trigger percentage, the shorter the control period next time; the lower the trigger percentage, the longer the control period next time; the pulse frequency in the next detection step is adjusted in positive correlation according to the trigger percentage; the higher the trigger percentage, the higher the pulse frequency next time; the lower the trigger percentage, the lower the pulse frequency next time.

[0013] By adopting the above technical solutions, the state of the leakage detection device can be accurately detected. By setting a specific combination of detection branches and tested branches, fault conditions can be simulated to effectively identify whether the device can respond normally to leakage conditions. Whether it is continuous short-circuit shunt or pulse operation, the performance of the device is tested in all aspects. Dynamically adjust the detection parameters, according to the trigger percentage calculated in real time, automatically adjust the length of the control period in an anti-correlated manner and the pulse frequency in a positive correlation, so that subsequent detection is more in line with actual needs, improve detection efficiency, avoid invalid detection cycles, quickly focus on potential problems of the device, and adapt to different working conditions to ensure that the leakage detection device always operates reliably and reduce safety hazards caused by device failure.

[0014] Optionally, the method further comprises the following steps:

[0015] The detection circuit comprises a relay and a short-circuit resistor, wherein the controlled end of the relay is electrically connected to the control signal output end of the leakage detection device; the execution switch of the relay is connected in parallel between the phase line and the neutral line selected by the detected branch, the short-circuit resistor is connected in series with the execution switch of the relay, and the short-circuit resistor is an adjustable resistor;

[0016] adjusting the resistance value of the short-circuit resistor according to the trigger percentage;

[0017] The higher the trigger percentage is, the greater the resistance is; the lower the trigger percentage is, the smaller the resistance is.

[0018] By adopting the above technical solution, on the one hand, a detection branch is constructed by combining a relay with a short-circuit resistor. The relay is controlled by the control end of the leakage detection device, and can accurately perform short-circuit or shunt actions, with convenient and efficient operation. The short-circuit resistor is adjustable, providing a basis for subsequent flexible optimization. On the other hand, when the trigger percentage is high, increasing the resistance value can moderately alleviate the shunting effect of the detection branch on the tested branch and avoid excessive interference; when the trigger percentage is low, reducing the resistance value can strengthen the detection intensity and enable the leakage detection device to more fully expose potential faults. In this way, it can adapt to the subtle differences under different working conditions, and further refine the detection accuracy, comprehensively guaranteeing the reliability and effectiveness of the working status detection of the leakage detection device, and reducing the risk of misjudgment.

[0019] Optionally, the method further comprises the following steps:

[0020] According to the change trend of the trigger percentage, calculating the increase amplitude value and the decrease amplitude value of the trigger percentage;

[0021] If the increase amplitude value of the trigger percentage is greater than the preset increase reference amplitude value, then reducing the pulse duty cycle of the pulse frequency;

[0022] If the reduction amplitude value of the trigger percentage is greater than the preset reduction reference amplitude value, the pulse duty cycle of the pulse frequency is increased.

[0023] By adopting the above technical solution, first, a quantitative analysis is carried out on the trend of the trigger percentage change, and its increase amplitude value and decrease amplitude value are calculated, which can keenly capture the dynamic change details of the working state of the leakage detection device, and is no longer limited to static numerical judgment. When the increase amplitude value exceeds the preset increase reference amplitude value, the pulse duty cycle of the pulse frequency is timely reduced, which can effectively alleviate the detection intensity, prevent unnecessary misjudgment or interference with normal circuit operation due to excessive stimulation of the tested branch in a short period of time, and ensure that the detection process is smooth and accurate. On the contrary, once the decrease amplitude value is greater than the preset decrease reference amplitude value, increasing the pulse duty cycle can strengthen the detection stimulation, prompting the device to present potential problems more efficiently, and avoid subtle faults from being hidden due to insufficient detection strength. On the whole, this method of dynamically adjusting the pulse duty cycle is closely related to the trigger percentage, fully adapts to complex and changeable circuit conditions, greatly improves the reliability, adaptability and timeliness of fault detection of the working state detection of the leakage detection device, and ensures the continuous and stable safety of electricity use.

[0024] Optionally, the method further comprises the following steps:

[0025] Calculating the severity of fluctuations in the trigger percentage;

[0026] The reference percentage is adjusted according to the severity of the fluctuation. The higher the severity of the fluctuation, the lower the reference percentage; and the lower the severity of the fluctuation, the higher the reference percentage.

[0027] By adopting the above technical solution and calculating the degree of fluctuation of the trigger percentage, it is possible to accurately understand the fluctuations in the working state of the leakage detection device. When the fluctuation is more severe, it means that the circuit environment is complex and changeable and the signal is unstable. At this time, lowering the reference percentage and appropriately relaxing the threshold for determining failure warning can prevent the misjudgment of device failure due to short-term severe fluctuations, and avoid frequent and unwarranted warnings interfering with the subsequent troubleshooting process; on the contrary, low fluctuations indicate that the operating environment of the device is relatively stable, and increasing the reference percentage tightens the warning standard to ensure that potential hidden dangers are not missed due to loose judgment conditions. Such dynamic adaptation of the reference percentage makes the entire detection mechanism more in line with actual working conditions, reduces false alarms and missed alarms, improves the accuracy and credibility of the detection results, ensures that leakage detection work is carried out efficiently and orderly, and reduces unnecessary operation and maintenance costs and safety risks.

[0028] Optionally, the method further comprises the following steps:

[0029] Based on arbitrarily selecting two-phase branches in a three-phase line as tested branches, the tested branches are respectively a first branch and a second branch;

[0030] Controlling the detection branch to short-circuit or shunt the first branch and the second branch in sequence; if the leakage detection device does not output a preset leakage signal, issuing a failure alarm prompt;

[0031] If the leakage detection devices all output a preset leakage signal, a normal prompt is output, and then according to a preset pulse frequency, within a preset control period, the detection branch is controlled to pulse-short-circuit or shunt the first branch and the second branch in succession;

[0032] Recording the number of times the first branch is short-circuited or shunted as the first pulse number; obtaining the number of times the leakage signal output by the leakage detection device within the control period as the first trigger number; calculating the ratio of the first trigger number to the first pulse number as a first ratio, and taking the percentage of the first ratio as a first trigger percentage;

[0033] Recording the number of times the second branch is short-circuited or shunted as the second pulse number; obtaining the number of times the leakage signal output by the leakage detection device within the control period as the second trigger number; calculating the ratio of the second trigger number to the second pulse number as the second ratio, and taking the percentage of the second ratio as the second trigger percentage;

[0034] Calculate an average trigger percentage according to the first trigger percentage and the second trigger percentage;

[0035] If the average trigger percentage is less than a preset reference percentage, a failure warning prompt is output.

[0036] By adopting the above technical solution, firstly, two-phase branches in the three-phase line are selected as the tested branches, which broadens the detection range. Compared with the detection of only a single-phase branch, the performance of the leakage detection device in different line combination scenarios can be more comprehensively considered, which greatly reduces the possibility of missing fault hazards due to the limitations of a single branch and improves the completeness of the detection. Secondly, a series of rigorous operations are performed on the first branch and the second branch respectively, from pulse short circuit or shunting, number recording, to accurate calculation of the trigger percentage, and then to the combination of the two to obtain the average trigger percentage. This process is progressive and meticulous. Taking the average trigger percentage as the basis for judgment, the state differences of the two-phase branches are cleverly balanced to avoid the overall judgment affected by the occasional fluctuations of a certain branch, making the detection results more stable and representative, and accurately locating the real working state of the device, effectively reducing misjudgment, and ensuring that the failure warning prompt is output only when the device does have a failure risk trend, ensuring the reliable operation of the power system, and reducing unnecessary maintenance costs and potential safety hazards.

[0037] Optionally, the method further comprises the following steps:

[0038] Based on arbitrarily selecting two-phase branches in a three-phase line as tested branches, the tested branches are respectively a first branch and a second branch;

[0039] Controlling the detection branch to short-circuit or shunt the first branch and the second branch at the same time; if the leakage detection device does not output a preset leakage signal, issuing a failure alarm prompt;

[0040] If the leakage detection device outputs a preset leakage signal, a normal prompt is output, and then according to a preset pulse frequency, within a preset control period, the detection branch is controlled to pulse-type simultaneously short-circuit or shunt the first branch and the second branch, and the first branch and the second branch are controlled by the same relay; the number of times the first branch or the second branch is short-circuited or shunted is recorded as the number of simultaneous pulses; the number of times the leakage signal output by the leakage detection device within the control period is obtained as the number of simultaneous triggers;

[0041] Calculating the ratio of the number of simultaneous triggers to the number of simultaneous pulses as a simultaneous ratio, and taking the percentage of the simultaneous ratio as a simultaneous trigger percentage;

[0042] If the simultaneous triggering percentage is less than a preset reference percentage, a failure warning prompt is output.

[0043] By adopting the above technical solution, any two-phase branches in the three-phase line are selected as the tested branches, breaking the limitation of single-phase detection, fully considering the multi-phase line combination scenario, greatly expanding the coverage dimension of the leakage detection device working status detection, and more accurately troubleshooting potential leakage hazards in complex circuit environments, reducing the probability of missing fault points. The same relay is used to simultaneously control the short-circuit or shunt action of the first branch and the second branch, reducing the number of control components, simplifying the circuit structure, reducing costs, and avoiding the risk of misoperation caused by improper coordination of multiple control components, thereby improving the stability and reliability of the overall detection process. The simultaneous trigger percentage is obtained with rigorous steps, and it is judged whether to output a failure warning prompt based on this. The response of the leakage detection device under the coordinated working condition of the two-phase branch is comprehensively considered to avoid the abnormal fluctuation of a single phase interfering with the overall conclusion, so that the final judgment result is more in line with the actual operating status of the device, effectively reducing false alarms or missed alarms, ensuring the continuous safe and stable operation of the power system, and facilitating efficient operation and maintenance management.

[0044] Optionally, the method further comprises the following steps:

[0045] Based on the three-phase branches in the three-phase line as the tested branches, the three-phase line includes a first branch, a second branch and a third branch;

[0046] Controlling the detection branch to short-circuit or shunt the first branch, the second branch and the third branch in sequence; if the leakage detection device does not output a preset leakage signal, issuing a failure alarm prompt;

[0047] If the leakage detection devices all output a preset leakage signal, a normal prompt is output, and then according to a preset pulse frequency, within a preset control period, the detection branch is controlled to pulse-short-circuit or shunt the first branch, the second branch, and the third branch in sequence;

[0048] Recording the number of times the first branch is short-circuited or shunted as the first pulse number; obtaining the number of times the leakage signal output by the leakage detection device within the control period as the first trigger number; calculating a first ratio of the first trigger number to the first pulse number, and taking the percentage of the first ratio as the first trigger percentage;

[0049] Recording the number of times the second branch is short-circuited or shunted as the second pulse number; obtaining the number of times the leakage signal output by the leakage detection device within the control period as the second trigger number; calculating a second ratio of the second trigger number to the second pulse number, and taking the percentage of the second ratio as the second trigger percentage;

[0050] Recording the number of times the third branch is short-circuited or shunted as the third pulse number; obtaining the number of times the leakage signal output by the leakage detection device within the control period as the third trigger number; calculating a third ratio of the third trigger number to the third pulse number, and taking the percentage of the third ratio as the third trigger percentage;

[0051] An average trigger percentage is calculated according to the first trigger percentage, the second trigger percentage and the third trigger percentage;

[0052] If the average trigger percentage is less than a preset reference percentage, a failure warning prompt is output.

[0053] By adopting the above technical solution, all branches of the three-phase line are included in the test scope, completely abandoning the one-sidedness of single-phase or two-phase detection, comprehensively considering the ability of the leakage detection device to cope with various line conditions under the complex three-phase power supply system, and thoroughly checking potential leakage risk points, which greatly enhances the comprehensiveness and integrity of the power system leakage hidden danger inspection, and reduces the possibility of electrical accidents caused by detection blind spots from the root. For each phase branch, the pulse short circuit or shunt operation is carefully performed, and the number of pulses and triggers are accurately recorded synchronously, and then the trigger percentage of each phase is scientifically calculated, and then the average trigger percentage is obtained comprehensively. This step-by-step and step-by-step approach fully balances the characteristics and operating differences of the three-phase branches, effectively avoiding the overall judgment result affected by temporary interference or abnormal fluctuations of a single branch, so that the final judgment is closely aligned with the actual performance status of the device, significantly improving the accuracy and reliability of the test results. The average trigger percentage is compared with the reference percentage to determine whether to output a failure warning prompt. The warning timing is just right to avoid frequent false alarms due to minor local abnormalities, ensuring that warnings are only issued when the overall performance of the device is indeed worrying and there is a greater risk of failure. This greatly reduces unnecessary operation and maintenance interference, ensures the safe, stable and efficient operation of the power system, and builds a solid defense line for the continuous and reliable operation of electrical equipment.

[0054] Optionally, the method further comprises the following steps:

[0055] Based on the arbitrary selection of 2-phase branches in the three-phase line as the tested branches, the three-phase line includes the first branch, the second branch and the third branch. The tested branches include three situations:

[0056] Case 1: The tested branches are the first branch and the second branch respectively;

[0057] The second case: the tested branches are the second branch and the third branch respectively;

[0058] The third case: the tested branches are the first branch and the third branch respectively;

[0059] Controlling the detection branch to detect the detected branch in accordance with the first situation, the second situation and the third situation in sequence;

[0060] In the three detection situations, if the leakage detection device fails to output the preset leakage signal, a failure alarm prompt will be issued;

[0061] If the leakage detection device outputs the preset leakage signal three times, it outputs a normal prompt, and then according to the preset pulse frequency, within the preset control period, the detection branch is controlled to pulse short-circuit or shunt the detected branch in three situations, and in each case, the detection branch short-circuits or shunts the corresponding branch at the same time:

[0062] Connect the circuit in the first case, and according to the preset pulse frequency, control the detection branch to simultaneously pulse-short-circuit or shunt the first branch and the second branch within a preset control period; the first branch and the second branch are controlled by the same relay; record the number of times the first branch or the second branch is short-circuited or shunted as the first simultaneous pulse number; obtain the number of times the leakage signal output by the leakage detection device within the control period as the first simultaneous trigger number; calculate the ratio of the first simultaneous trigger number to the first simultaneous pulse number as the first simultaneous ratio, and use the percentage of the first simultaneous ratio as the first simultaneous trigger percentage;

[0063] Connect the circuit in the second case, and according to the preset pulse frequency, control the detection branch to simultaneously pulse-short-circuit or shunt the second branch and the third branch within the preset control period; the second branch and the third branch are controlled by the same relay; record the number of times the second branch or the third branch is short-circuited or shunted as the second simultaneous pulse number; obtain the number of times the leakage signal output by the leakage detection device within the control period as the second simultaneous trigger number; calculate the ratio of the second simultaneous trigger number to the second simultaneous pulse number as the second simultaneous ratio, and use the percentage of the second simultaneous ratio as the second simultaneous trigger percentage;

[0064] Connect the circuit in the third case, and according to the preset pulse frequency, control the detection branch to simultaneously pulse-short-circuit or shunt the first branch and the third branch within the preset control period; the first branch and the third branch are controlled by the same relay; record the number of times the first branch or the third branch is short-circuited or shunted as the third simultaneous pulse number; obtain the number of times the leakage signal output by the leakage detection device within the control period as the third simultaneous trigger number; calculate the ratio of the third simultaneous trigger number to the third simultaneous pulse number as the third simultaneous ratio, and use the percentage of the third simultaneous ratio as the third simultaneous trigger percentage;

[0065] The average values ​​of the first simultaneous trigger percentage, the second simultaneous trigger percentage and the third simultaneous trigger percentage are calculated to obtain a comprehensive trigger percentage; if the comprehensive trigger percentage is less than a preset reference percentage, a failure warning prompt is output.

[0066] By adopting the above technical solution, not only any two-phase branch combination in the three-phase line is covered, but also all possible two-phase matching situations are exhaustively listed, completely eliminating the possibility of missing potential leakage hazards due to omissions in branch selection, and completely simulating the complex line conditions in the actual operation of three-phase power supply, laying a solid foundation for the all-round performance evaluation of the leakage detection device, and greatly improving the accuracy and completeness of the leakage hazard investigation of the power system. Each branch combination is controlled by the same relay to short-circuit or shunt action, which greatly simplifies the circuit control structure, reduces component redundancy, reduces hardware costs and line complexity, and effectively avoids misoperation caused by coordination failures of multiple decentralized control components, ensuring a smooth and stable detection process, improving detection efficiency, and enabling complex multi-phase detection to be carried out efficiently and orderly. For different branch combinations, the simultaneous trigger percentage is rigorously calculated, and then the average value is calculated as the comprehensive trigger percentage, so as to accurately measure the actual response capability of the leakage detection device in a multi-line scenario. Fully consider the interaction and respective characteristics of each phase branch, cleverly balance the interference caused by instantaneous fluctuations of a single branch or combination differences, so that the final judgment is closely aligned with the actual operating status of the device, effectively filter out misjudgment factors, and only prudently issue failure warning prompts when the device performance is indeed poor and there is a significant risk of failure, avoid unnecessary operation and maintenance interference, ensure the safe, stable and continuous operation of the power system, and safeguard the reliable operation of electrical equipment.

[0067] In a second aspect, the present application provides a working state detection system for a leakage detection device, which adopts the following technical solution:

[0068] A working state detection system for a leakage detection device comprises a processor, wherein the processor executes the steps of any one of the above-mentioned working state detection methods for a leakage detection device.

[0069] In a third aspect, the present application provides a storage medium, which adopts the following technical solution:

[0070] A storage medium stores a program, and when the program is executed by a processor, the steps of any one of the above-mentioned methods for detecting the working state of a leakage detection device are implemented.

[0071] In summary, the present application includes at least one of the following beneficial technical effects:

[0072] It covers various branch combinations in three-phase lines, whether it is single-phase, two-phase different combinations or comprehensive considerations of three-phase, and comprehensively covers the possible working conditions in actual power lines, avoiding the omission of leakage hazards to the greatest extent. It can accurately and comprehensively detect the working status of the leakage detection device in different line scenarios to ensure the integrity of leakage detection in the power system.

[0073] Using the same relay to control the short-circuit or shunt operation of related branches reduces the number of control components, simplifies the circuit structure, reduces hardware costs and the risk of misoperation due to poor coordination of multiple control components, making the entire detection process more concise, stable and efficient, and facilitating the implementation and conduct of detection work.

[0074] By rigorously calculating the trigger percentage corresponding to each branch, such as the ratio of the number of pulses to the number of triggers, and further comprehensively calculating the average trigger percentage or the comprehensive trigger percentage as the basis for judgment, the mutual influence between different branches and the differences in the characteristics of each branch are fully considered, and the interference factors such as temporary fluctuations in a single branch are effectively filtered out, so that the final judgment on the working status of the leakage detection device is more in line with its actual performance, and it is accurately judged whether there is a risk of failure, and early warning prompts are reasonably output to reduce false alarms and missed alarms, ensuring the safe and stable operation of the power system.

[0075] It can dynamically adjust key parameters such as the length of the control period, pulse frequency, short-circuit resistance, and reference percentage according to indicators such as the trigger percentage and fluctuation intensity, so that the detection process can adapt to different working conditions, optimize the detection strategy in real time, and more sensitively capture potential problems of the device, further improve the reliability and effectiveness of the detection, and help realize refined and intelligent leakage detection device status detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 This is a schematic diagram of a leakage detection circuit in the prior art.

[0077] Figure 2 The invention discloses a step diagram of a method for detecting a working state of a leakage detection device.

[0078] Figure 3 It is a schematic diagram of a leakage self-detection circuit in an embodiment of the present application, based on arbitrarily selecting a branch of one phase in a three-phase line as a tested branch.

[0079] Figure 4 It is the logic diagram for realizing leakage self-test.

[0080] Figure 5 It is a step diagram for adjusting the pulse duty cycle of the pulse frequency according to the trigger percentage.

[0081] Figure 6The invention is a step diagram based on arbitrarily selecting 2-phase branches in a three-phase line as tested branches, and controlling the detection branch to successively short-circuit or shunt the first branch and the second branch.

[0082] Figure 7 The invention is a step diagram based on arbitrarily selecting 2-phase branches in a three-phase circuit as tested branches, and controlling the detection branch to short-circuit or shunt the first branch and the second branch at the same time.

[0083] Figure 8 The step diagram is based on taking the three-phase branches in the three-phase line as the tested branches to control the detection branches to short-circuit or shunt the first branch, the second branch and the third branch in sequence.

[0084] Fig. 9 It is a step diagram based on arbitrarily selecting 2-phase branches in a three-phase line as the tested branches. The tested branches include three situations. The control detection branch detects the tested branches according to the first situation, the second situation and the third situation in sequence. DETAILED DESCRIPTION

[0085] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings.

[0086] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0087] Reference Figure 1 The basic process of the leakage detection circuit is that the PCBA determines whether there is leakage through the zero-sequence transformer induction current, thereby controlling the on and off of the load power supply; since the zero-sequence transformer and PCBA have a certain life span, the circuit will fail after a period of use, resulting in the PCBA being unable to accurately judge the leakage situation, resulting in false triggering or no triggering, thereby affecting the user experience and posing a major hidden danger to the user's life safety.

[0088] The present application embodiment discloses a method for detecting the working state of a leakage detection device, referring to Figure 2 and Figure 3 and Figure 4 , including the following steps:

[0089] In a complex power system environment, the leakage detection circuit is tested based on the three-phase line. In the specific operation, a branch of one phase is randomly selected from the three-phase line as the tested branch, and a series of subsequent detection processes are implemented based on this. Take this embodiment as an example, an advanced and effective method is adopted, that is, the short circuit of the live wire (L) and the neutral wire (N) is accurately controlled through the PCBA (printed circuit board assembly) to simulate the generation of leakage current, thereby realizing a comprehensive and detailed self-test of the leakage detection circuit.

[0090] A detection branch will be specially set up next to the selected branch to be tested. This detection branch can short-circuit or shunt the branch to be tested. The connection point between the branch to be tested and the detection branch is located on one side of the zero-sequence current transformer. After the detection branch performs a short-circuit or shunt action on the branch to be tested, the part of the line of the branch to be tested that passes through the zero-sequence current transformer will undergo corresponding changes, either no current passes through at all, or the current passing through is significantly reduced compared to before. It is worth noting that this detection branch will not pass through the zero-sequence current transformer in the entire circuit layout.

[0091] In the actual detection process, the detection branch will be controlled accordingly to short-circuit or shunt the tested branch, and this state must last for the set first stable time. At this time, it is a non-pulse signal, which is a continuous signal of the set time. After this time, it is necessary to check the feedback of the leakage detection device. If the leakage detection device does not output the pre-set leakage signal at this time, it means that there may be some abnormal conditions. At this time, it is necessary to issue a failure alarm prompt in time so that the relevant staff can quickly know and take corresponding countermeasures.

[0092] After the above operations, if the leakage detection device outputs a preset leakage signal, a normal prompt will be output first, indicating that the detection at this stage appears to be normal. Next, according to the preset pulse frequency, within the control period that is also set in advance, the detection branch will be precisely controlled to short-circuit or shunt the tested branch in a pulsed manner. In this process, the specific number of times the tested branch is short-circuited or shunted is recorded, and this number is defined as the number of pulses. At the same time, the specific number of times the leakage detection device outputs a leakage signal within this control period is obtained as the trigger number.

[0093] By calculating the ratio between the trigger times and the pulse times, and then converting this ratio into a percentage, the trigger percentage plays a critical role in the entire detection and judgment process, and it can intuitively reflect some performance conditions of the leakage detection device under the current detection situation.

[0094] If the calculated trigger percentage is less than the pre-set reference percentage, it means that there may be potential problems with the leakage detection device, or its working condition does not meet the ideal standard. At this time, it is necessary to output a failure warning prompt to remind relevant personnel to further investigate and analyze the specific reasons to prevent possible safety hazards such as leakage.

[0095] On the contrary, if the trigger percentage is greater than the preset reference percentage, it means that the current working state of the leakage detection device is still relatively good, so a normal prompt will be output. Not only that, but the setting of relevant parameters in the next detection step will be intelligently adjusted according to the value of this trigger percentage. Specifically, in terms of adjusting the length of the control period, it is inversely correlated with the trigger percentage, that is, the higher the trigger percentage, the better the detection effect this time, and the control period set for the next detection can be shortened accordingly, which can improve the detection efficiency and continuously monitor the device more accurately; and if the trigger percentage is lower, it means that more detailed and in-depth detection may be required, and the next control period needs to be appropriately extended.

[0096] In terms of adjusting the pulse frequency, it is positively correlated with the trigger percentage. When the trigger percentage is higher, it means that the device responds well to the pulse detection. In the next detection step, the pulse frequency can be appropriately increased to further strengthen the detection intensity; on the contrary, if the trigger percentage is lower, in order to detect the device status more comprehensively and accurately, the next pulse frequency must be lowered accordingly to ensure the effectiveness and accuracy of the detection, so that the detection process of the entire leakage detection device working status can be carried out continuously, scientifically and efficiently.

[0097] Accurately detect the status of the leakage detection device, use the specific detection branch and the tested branch combination to simulate the fault situation, effectively identify whether the device can respond normally to the leakage condition, whether it is continuous short-circuit shunt or pulse operation, all aspects of the device performance are tested. Dynamically adjust the detection parameters, according to the real-time calculated trigger percentage, automatically adjust the control period length in an anti-correlation manner, and adjust the pulse frequency in a positive correlation, so that subsequent detection is more in line with actual needs, improve detection efficiency, avoid invalid detection cycles, quickly focus on potential problems of the device, and adapt to different working conditions, to ensure that the leakage detection device always operates reliably and reduce safety hazards caused by device failure.

[0098] Reference Figure 2The detection circuit includes a relay and a short-circuit resistor. The controlled end of the relay is electrically connected to the control signal output end of the leakage detection device; the execution switch of the relay is connected in parallel between the phase line and the neutral line selected by the tested branch, and the short-circuit resistor is connected in series with the execution switch of the relay. The detection branch is constructed by combining a relay with a short-circuit resistor. The relay is controlled by the control end of the leakage detection device and can accurately perform short-circuit or shunt actions. The operation is convenient and efficient. The short-circuit resistor is adjustable, which provides a basis for subsequent flexible optimization.

[0099] In other embodiments, the short-circuit resistor is a fixed resistor or an adjustable resistor; when the short-circuit resistor is an adjustable resistor, the method further includes:

[0100] The resistance of the short-circuit resistor is adjusted according to the trigger percentage; the higher the trigger percentage, the greater the resistance; the lower the trigger percentage, the smaller the resistance. If the trigger percentage is high, it means that the leakage detection device responds to the simulated leakage situation very sensitively and efficiently under the current working conditions. In order to avoid excessive interference with the normal detection process of the circuit, the short-circuit resistor will intelligently increase its own resistance, just like adding an appropriate "current limiting gate" to the circuit current, alleviating the shunt impact of the detection branch on the tested branch, and ensuring the stability and accuracy of the detection data. On the contrary, if the trigger percentage is low, it means that the device may not have fully exposed potential problems during the detection process, or there are areas with insensitive responses. In this case, the short-circuit resistor will automatically reduce its resistance, just like opening a smoother "shortcut" for the detection current, strengthening the shunt effect, and prompting the leakage detection device to be tested more thoroughly, and the hidden subtle faults will be revealed without hiding, and the reliability and precision of the leakage detection operation will be fully guaranteed.

[0101] Reference Figure 5 , the method further comprises the steps of:

[0102] According to the changing trend of the trigger percentage, the increase and decrease amplitude values ​​of the trigger percentage are calculated; the changing trend of the trigger percentage is quantitatively analyzed, and its increase and decrease amplitude values ​​are calculated, which can keenly capture the dynamic change details of the working state of the leakage detection device and is no longer limited to static numerical judgment.

[0103] If the increase amplitude value of the trigger percentage is greater than the preset increase reference amplitude value, the pulse duty cycle of the pulse frequency is reduced. When the increase amplitude value exceeds the preset increase reference amplitude value, the pulse duty cycle of the pulse frequency is reduced in time, which can effectively ease the detection intensity and prevent unnecessary misjudgment or interference with normal circuit operation due to excessive stimulation of the tested branch in a short period of time, ensuring a smooth and accurate detection process.

[0104] On the contrary, if the reduction amplitude value of the trigger percentage is greater than the preset reduction reference amplitude value, the pulse duty cycle of the pulse frequency is increased. Once the reduction amplitude value is greater than the preset reduction reference amplitude value, increasing the pulse duty cycle can strengthen the detection stimulus, prompting the device to present potential problems more efficiently, and avoid subtle faults being hidden due to insufficient detection efforts. On the whole, this method of dynamically adjusting the pulse duty cycle is closely related to the trigger percentage, fully adapting to complex and changeable circuit conditions, greatly improving the reliability and adaptability of the leakage detection device's working status detection and the timeliness of troubleshooting, and ensuring the continuous and stable safety of electricity use.

[0105] The method further comprises the steps of:

[0106] Calculate the severity of fluctuations in the trigger percentage; the severity is accurately eliminated by combining moving average method, trend line fitting and other techniques to accurately eliminate short-term accidental fluctuations in the data, accurately outline the long-term, real fluctuation trajectory of the trigger percentage, and then derive a numerical indicator that can accurately quantify the severity of fluctuations.

[0107] The reference percentage is adjusted according to the severity of the fluctuation. The higher the severity of the fluctuation, the lower the reference percentage; the lower the severity of the fluctuation, the higher the reference percentage.

[0108] When the intensity of fluctuations rises like a storm, it means that the electrical environment in which the leakage detection device is located is complex and changeable, and is full of various unstable factors, such as instantaneous voltage spikes and intermittent interference in the line. In this case, if the machine applies the conventional reference percentage for failure judgment, it is very easy to cause false alarms, which puts the operation and maintenance personnel into unnecessary troubleshooting difficulties. Therefore, lowering the reference percentage will expand a certain fault tolerance space for the determination of the test results. Allowing the device to have a certain fluctuation adaptation range under complex working conditions to avoid frequent triggering of failure warnings due to short-term abnormal fluctuations, ensure that the detection system can still operate stably in complex environments, and continuously monitor in an orderly manner, accurately lock in the real leakage hazards, rather than being misled by superficial fluctuations.

[0109] On the contrary, if the fluctuation intensity tends to be moderate, it indicates that the leakage detection device is in a relatively stable and ideal working environment with minimal interference, the electrical parameters are stable, and the line status is healthy. At this time, the reference percentage is increased to raise the threshold of failure warning. Ensure that the leakage detection device can maintain optimal performance even in calm weather and protect the safety of the power system in all aspects.

[0110] Reference Figure 6 In other embodiments, the method further comprises the following steps:

[0111] Based on arbitrarily selecting 2-phase branches in the three-phase line as the tested branches, the tested branches are respectively the first branch and the second branch, such as A and B phases.

[0112] The control detection branch is short-circuited or shunted the first branch and the second branch in turn; if the leakage detection device does not output a preset leakage signal, a failure alarm prompt is issued; this step is a non-pulse frequency detection.

[0113] If the leakage detection devices all output the preset leakage signal, a normal prompt is output, and then according to the preset pulse frequency, within the preset control period, the control detection branch is pulse-shorted or shunted to the first branch and the second branch in succession. If the leakage detection devices all successfully output the preset leakage signal in the basic detection stage, it indicates that the line has the conditions for further in-depth detection, and the system immediately enters the pulse detection mode. The control unit obtains the precise time reference from its high-precision clock chip, and combines the built-in pulse generation algorithm to generate a control signal sequence that meets the preset pulse frequency. This pulse frequency is obtained through a large number of experiments and theoretical calculations. For example, it is set to generate a pulse signal with a pulse width of n microseconds every n milliseconds to adapt to the capacitance and inductance characteristics of different lines and accurately stimulate potential leakage characteristics. These pulse signals drive the relay of the detection branch to periodically short-circuit or shunt the first branch at an ultra-high-speed switching rate. Within the preset control period (such as lasting n seconds), the action is performed continuously in strict accordance with the pulse sequence to ensure that the line fully exposes the leakage characteristics under the stimulation of dynamically changing current. Subsequently, the system switches to pulse operation on the second branch and repeats the above precise process to ensure the consistency and integrity of the detection conditions of the two branches.

[0114] Record the number of times the first branch is short-circuited or shunted as the first pulse number; obtain the number of leakage signals output by the leakage detection device during the control period as the first trigger number; calculate the ratio of the first trigger number to the first pulse number as the first ratio, and use the percentage of the first ratio as the first trigger percentage. During the period when the first branch is subjected to pulse stimulation, the counter module of the system tightly locks each successful short-circuit or shunting action of the detection branch, and uses edge-triggered counting technology to accurately record the number of times the first branch is short-circuited or shunted, and clearly defines it as the first pulse number, which is stored in the system's cache area to prevent data loss. At the same time, the signal acquisition port of the leakage detection device is connected to the interrupt trigger pin of the control unit. Whenever a leakage signal output is detected, the interrupt service program is immediately triggered, and the trigger event is accurately recorded, thereby accurately obtaining the number of leakage signals output by the leakage detection device during the control period, which is defined as the first trigger number. Subsequently, the control unit's computing engine quickly retrieves the two data, uses the floating-point unit to perform high-precision division operations, and obtains the ratio of the first trigger number to the first pulse number. It then converts it into a percentage through a standardized conversion procedure to accurately determine the first trigger percentage, with the value accurate to n decimal places, providing detailed data support for subsequent analysis.

[0115] Repeat the rigorous data collection and calculation process for the second branch. Record the number of times the second branch is short-circuited or shunted as the second pulse number; obtain the number of leakage signals output by the leakage detection device during the control period as the second trigger number; calculate the ratio of the second trigger number to the second pulse number as the second ratio, and use the percentage of the second ratio as the second trigger percentage. The counter uses the same advanced counting mechanism to record the pulse operation frequency of the second branch as the second pulse number; the leakage detection device and the control unit work together to accurately count the number of leakage signal outputs to form the second trigger number, and obtain the second ratio through complex calculations and convert it into a percentage to obtain the second trigger percentage, which also ensures high-precision storage and processing, laying the foundation for a comprehensive evaluation of the line leakage characteristics.

[0116] After successfully obtaining the first trigger percentage and the second trigger percentage, the intelligent data analysis software package built into the control unit is quickly started. According to the pre-set weighted average model, the load proportion of the two branches in the three-phase line, the importance level and other factors are considered, or a simple arithmetic average algorithm is used to accurately calculate the average trigger percentage. For example, if the weighted average is used, the weight of the first branch is set to [X]%, and the weight of the second branch is [X]%, based on which the final average result is calculated.

[0117] The system then compares the average trigger percentage with the preset reference percentage, which is derived from a large amount of historical fault data statistical analysis, line insulation material characteristics research, and industry safety standards, and accurately defines the line leakage risk tolerance. Once the average trigger percentage is less than the preset reference percentage, it indicates that the line leakage response sensitivity is poor and there are potential leakage hazards that have not been fully detected. At this time, the early warning output module of the control unit is activated, and failure warning prompts are pushed to the remote monitoring platform through a variety of communication interfaces (such as Ethernet, 485 bus, wireless Bluetooth, etc.). At the same time, the local human-computer interaction interface displays the early warning information in the form of eye-catching red pop-up windows and scrolling subtitles, and lists in detail the current average trigger percentage, the trigger data of the two branches, and other key contents, to assist operation and maintenance personnel to quickly locate and investigate potential fault sources such as line insulation aging, moisture, and loose connections, to ensure the continuous and safe operation of the three-phase line.

[0118] Reference Figure 7 In other embodiments, the method further comprises the following steps:

[0119] Two-phase branches are randomly selected from the three-phase line as the tested branches, and the tested branches are respectively the first branch and the second branch.

[0120] The control detection branch is short-circuited or shunted to the first branch and the second branch at the same time; if the leakage detection device does not output the preset leakage signal, a failure alarm prompt is issued. When the short-circuit or shunting command is issued, the relay is quickly energized to connect the detection branch to the first branch and the second branch at the same time. The action response time is controlled in microseconds to avoid the interference of transient fluctuations in the line caused by the time difference with the detection results, and to ensure the consistency and stability of the detection conditions.

[0121] If the leakage detection device outputs a preset leakage signal, it outputs a normal prompt, and then according to the preset pulse frequency, within the preset control period, the detection branch is controlled to pulse-type simultaneously short-circuit or shunt the first branch and the second branch, and the first branch and the second branch are controlled by the same relay; the number of times the first branch or the second branch is short-circuited or shunted is recorded as the number of simultaneous pulses; the number of leakage signals output by the leakage detection device within the control period is obtained as the number of simultaneous triggers. For example, it is set to generate a pulse signal with a steep leading edge and a pulse width of 500 microseconds every 10 milliseconds to accurately match the inherent electrical resonance characteristics of the line and maximize the potential leakage hazards. After these pulse signals are enhanced in driving capability by the power amplifier circuit, the double-pole double-throw relays of the first branch and the second branch are accurately driven and controlled, so that the detection branch performs periodic short-circuit or shunt operations on the two branches in strict accordance with the pulse sequence within the preset control period (such as 60 seconds), ensuring that the line capacitors, inductors and other energy storage elements are fully exposed to the potential leakage problems under the stimulation of dynamic pulse currents.

[0122] The ratio of the number of simultaneous triggers to the number of simultaneous pulses is calculated as the simultaneous ratio, and the percentage of the simultaneous ratio is used as the simultaneous trigger percentage. The counter uses the rising edge trigger counting mechanism of the relay feedback signal to accurately count the number of times the first branch or the second branch (because the two act synchronously, the count value is the same) is short-circuited or shunted, and defines it as the number of simultaneous pulses, and stores it in real time in the system's large-capacity data register to prevent data loss or overflow. At the same time, the leakage detection device and the system interact with data in real time through a high-speed optical fiber communication link. Whenever a leakage signal output is detected, an interrupt request is immediately sent to the system. The system responds quickly and records the trigger event, accurately obtaining the number of leakage signals output by the leakage detection device during the control period, and marking it as the number of simultaneous triggers. Subsequently, the system's computing core calls the floating-point operation instruction set to efficiently calculate the ratio of the number of simultaneous triggers to the number of simultaneous pulses, and then converts the result into a percentage through a standardized numerical conversion program to obtain the percentage of simultaneous triggers, providing a key indicator for the quantitative assessment of line leakage risks.

[0123] If the simultaneous trigger percentage is less than the preset reference percentage, a failure warning prompt will be output. For example, for a three-phase line with specific insulation material and specific load environment, the reference percentage is set to 85%. Once the calculated simultaneous trigger percentage is less than the preset value, it indicates that the line leakage response sensitivity is poor, and there is a high possibility of hidden leakage risks that have not been detected.

[0124] Selecting any two-phase branches in the three-phase line as the tested branches breaks the limitation of single-phase detection, fully considers the multi-phase line combination scenario, greatly expands the coverage dimension of the leakage detection device working status detection, and can more accurately check the potential leakage hazards in complex circuit environments and reduce the probability of missing fault points. Using the same relay to simultaneously control the short-circuit or shunt action of the first branch and the second branch reduces the number of control components, simplifies the circuit structure, reduces costs, and avoids the risk of misoperation caused by improper coordination of multiple control components, thereby improving the stability and reliability of the overall detection process. The simultaneous trigger percentage is obtained with rigorous steps, and it is judged whether to output a failure warning prompt based on this. The response of the leakage detection device under the coordinated working conditions of the two-phase branches is comprehensively considered to avoid the abnormal fluctuation of a single phase interfering with the overall conclusion, so that the final judgment result is more in line with the actual operating status of the device, effectively reducing false alarms or missed alarms, ensuring the continuous safe and stable operation of the power system, and facilitating efficient operation and maintenance management.

[0125] In addition, simultaneous operation can affect two branches within the same time period and complete the simulation of their specific working conditions at one time. There is no need to wait in stages as in successive operations, which saves a lot of time costs. It is especially suitable for scenarios where large-scale three-phase line networks are rapidly inspected. It can significantly speed up the overall inspection progress and improve the timeliness of power system maintenance.

[0126] When short-circuiting or shunting occurs at the same time, the external conditions such as the electromagnetic environment and instantaneous power shock of the lines are almost exactly the same, ensuring that the first branch and the second branch are tested under equal interference factors, minimizing the potential impact of factors such as line temperature and changes in the surrounding electromagnetic field caused by time differences on the accuracy of leakage detection results, making data comparison more scientific.

[0127] In a three-phase line, there may be complex electromagnetic coupling between branches. When acting on two branches at the same time, the comprehensive leakage performance under the mutual influence of the two branches can be observed in real time, and those leakage defects that are only exposed under specific coupling conditions can be accurately located. This is difficult to achieve by sequential operation because it cannot ensure that the two branches are detected in exactly the same coupling instant state.

[0128] The successive short-circuit or shunting operations will cause the system power to fluctuate significantly in different periods due to the time difference in line state switching, which will have an impact on the power supply stability; while simultaneous operation can maintain a relatively stable energy consumption peak, avoid grid voltage fluctuations caused by multiple abrupt power changes, ensure the smooth operation of the power system, and is especially beneficial to the normal operation of equipment that is sensitive to voltage stability.

[0129] Reference Figure 8 In other embodiments, the method further comprises the following steps:

[0130] Based on the three-phase branches in the three-phase line as the tested branches, the three-phase line includes a first branch, a second branch and a third branch.

[0131] The control detection branch short-circuits or shunts the first branch, the second branch and the third branch in sequence; if the leakage detection device does not output a preset leakage signal, a failure alarm prompt is issued.

[0132] If the leakage detection devices all output the preset leakage signal, a normal prompt is output, and then according to the preset pulse frequency, within the preset control period, the detection branch is controlled to pulse short-circuit or shunt the first branch, the second branch and the third branch in succession. Combined with the preset unique pulse frequency parameters, such as generating a pulse with a steep rise in the leading edge and a pulse width of 400 microseconds every 8 milliseconds, the inherent electrical characteristics of the line are adapted. The drive relay group switches to the pulse working mode. The high-frequency pulse short-circuit or shunt operation is started for the first branch in sequence, and within the preset control period (such as 30 seconds), the line is stimulated continuously in strict accordance with the pulse rhythm, so that the line capacitor and inductor components are fully exposed to potential leakage defects under the dynamic pulse current. Then interrupt for a moment to ensure that the electrical parameters of the line are smoothly transitioned, and then the pulse operation of the second branch is driven, and the above precise process is repeated. Finally, the pulse operation of the third branch is driven, and the pulse detection process is repeated to ensure that the detection data of the three-phase branch is horizontally comparable and vertically accurate.

[0133] Record the number of times the first branch is short-circuited or shunted as the first pulse number; obtain the number of leakage signals output by the leakage detection device within the control period as the first trigger number; calculate the first ratio of the first trigger number to the first pulse number, and use the percentage of the first ratio as the first trigger percentage.

[0134] Record the number of times the second branch is short-circuited or shunted as the second pulse number; obtain the number of leakage signals output by the leakage detection device during the control period as the second trigger number; calculate the second ratio of the second trigger number to the second pulse number, and use the percentage of the second ratio as the second trigger percentage.

[0135] Record the number of times the third branch is short-circuited or shunted as the third pulse number; obtain the number of leakage signals output by the leakage detection device during the control period as the third trigger number; calculate the third ratio of the third trigger number to the third pulse number, and use the percentage of the third ratio as the third trigger percentage.

[0136] The average trigger percentage is calculated according to the first trigger percentage, the second trigger percentage and the third trigger percentage.

[0137] If the average trigger percentage is less than the preset reference percentage, a failure warning prompt will be output.

[0138] All branches of the three-phase line are included in the test scope, completely abandoning the one-sidedness of single-phase or two-phase detection, comprehensively considering the ability of the leakage detection device to cope with various line conditions under the complex three-phase power supply system, and thoroughly checking potential leakage risk points, which greatly enhances the comprehensiveness and integrity of the power system leakage hidden danger inspection, and reduces the possibility of electrical accidents caused by detection blind spots from the root. For each phase branch, pulse short-circuit or shunt operation is carefully performed, and the number of pulses and triggers are accurately recorded synchronously, and then the trigger percentage of each phase is scientifically calculated, and then the average trigger percentage is obtained comprehensively. This step-by-step and step-by-step approach fully balances the characteristics and operating differences of the three-phase branches, effectively avoiding the overall judgment result affected by temporary interference or abnormal fluctuations of a single branch, so that the final judgment is closely aligned with the actual performance status of the device, significantly improving the accuracy and reliability of the test results. The average trigger percentage is compared with the reference percentage to determine whether to output a failure warning prompt. The warning timing is just right to avoid frequent false alarms due to minor local abnormalities, ensuring that warnings are only issued when the overall performance of the device is indeed worrying and there is a greater risk of failure. This greatly reduces unnecessary operation and maintenance interference, ensures the safe, stable and efficient operation of the power system, and builds a solid defense line for the continuous and reliable operation of electrical equipment.

[0139] Reference Fig. 9 In other embodiments, the method further comprises the following steps:

[0140] Based on the arbitrary selection of 2-phase branches in the three-phase line as the tested branches, the three-phase line includes the first branch, the second branch and the third branch. The tested branches include three situations:

[0141] Case 1: The tested branches are the first branch and the second branch respectively;

[0142] The second case: the tested branches are the second branch and the third branch respectively;

[0143] The third situation: the tested branches are the first branch and the third branch.

[0144] The control detection branch detects the detected branch in turn according to the first situation, the second situation and the third situation.

[0145] In the three detection situations, if the leakage detection device fails to output the preset leakage signal, a failure alarm prompt will be issued.

[0146] If the leakage detection device outputs the preset leakage signal three times, it will output a normal prompt, and then according to the preset pulse frequency, within the preset control period, control the detection branch to pulse short-circuit or shunt the tested branch in three situations, and in each case, the detection branch short-circuits or shunts the corresponding branch at the same time:

[0147] Connect the circuit in the first case, and according to the preset pulse frequency, control the detection branch to simultaneously pulse-short-circuit or shunt the first branch and the second branch within the preset control period; the first branch and the second branch are controlled by the same relay; record the number of times the first branch or the second branch is short-circuited or shunted as the first simultaneous pulse number; obtain the number of leakage signals output by the leakage detection device within the control period as the first simultaneous trigger number; calculate the ratio of the first simultaneous trigger number to the first simultaneous pulse number as the first simultaneous ratio, and use the percentage of the first simultaneous ratio as the first simultaneous trigger percentage.

[0148] Connect the circuit in the second case, and according to the preset pulse frequency, control the detection branch to simultaneously pulse-short-circuit or shunt the second branch and the third branch within the preset control period; the second branch and the third branch are controlled by the same relay; record the number of times the second branch or the third branch is short-circuited or shunted as the second simultaneous pulse number; obtain the number of leakage signals output by the leakage detection device within the control period as the second simultaneous trigger number; calculate the ratio of the second simultaneous trigger number to the second simultaneous pulse number as the second simultaneous ratio, and use the percentage of the second simultaneous ratio as the second simultaneous trigger percentage.

[0149] Connect the circuit in the third case, and according to the preset pulse frequency, control the detection branch to simultaneously pulse-short-circuit or shunt the first branch and the third branch within the preset control period; the first branch and the third branch are controlled by the same relay; the number of times the first branch or the third branch is short-circuited or shunted is recorded as the third simultaneous pulse number; the number of leakage signals output by the leakage detection device within the control period is obtained as the third simultaneous trigger number; the ratio of the third simultaneous trigger number to the third simultaneous pulse number is calculated as the third simultaneous ratio, and the percentage of the third simultaneous ratio is taken as the third simultaneous trigger percentage.

[0150] The average values ​​of the first simultaneous trigger percentage, the second simultaneous trigger percentage and the third simultaneous trigger percentage are calculated to obtain a comprehensive trigger percentage; if the comprehensive trigger percentage is less than a preset reference percentage, a failure warning prompt is output.

[0151] It not only covers any two-phase branch combination in the three-phase line, but also exhaustively lists all possible two-phase matching situations, completely eliminating the possibility of missing potential leakage hazards due to omissions in branch selection, and completely simulating the complex line conditions in the actual operation of three-phase power supply, laying a solid foundation for the all-round performance evaluation of leakage detection devices, and greatly improving the accuracy and completeness of leakage hazard investigation in power systems. Each branch combination is controlled by the same relay to short-circuit or shunt action, which greatly simplifies the circuit control structure, reduces component redundancy, reduces hardware costs and line complexity, and effectively avoids misoperation caused by coordination failures of multiple distributed control components, ensuring a smooth and stable detection process, improving detection efficiency, and enabling complex multi-phase detection to be carried out efficiently and orderly. The simultaneous trigger percentage is rigorously calculated for different branch combinations, and then the average value is calculated as the comprehensive trigger percentage, so as to accurately measure the true response capability of the leakage detection device in multiple line scenarios. Fully consider the interaction and respective characteristics of each phase branch, cleverly balance the interference caused by instantaneous fluctuations of a single branch or combination differences, so that the final judgment is closely aligned with the actual operating status of the device, effectively filter out misjudgment factors, and only prudently issue failure warning prompts when the device performance is indeed poor and there is a significant risk of failure, avoid unnecessary operation and maintenance interference, ensure the safe, stable and continuous operation of the power system, and safeguard the reliable operation of electrical equipment.

[0152] An embodiment of the present application further discloses a working state detection system for a leakage detection device, comprising a processor, wherein the processor executes the steps of any one of the working state detection methods for a leakage detection device described above.

[0153] An embodiment of the present application further discloses a storage medium, in which a program is stored. When the program is executed by a processor, the steps of any one of the above-mentioned methods for detecting the working state of a leakage detection device are implemented.

[0154] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for detecting the working state of a leakage detection device, characterized in that: The steps include: Based on arbitrarily selecting a branch of one phase in a three-phase line as a measured branch, a detection branch is arranged next to the measured branch, the detection branch is used to short-circuit or shunt the measured branch, and the connection point between the measured branch and the detection branch is located on one side of a zero-sequence current transformer, so that after the measured branch is short-circuited or shunted by the detection branch, no current passes through the part of the measured branch passing through the zero-sequence current transformer or the passing current is reduced; the detection branch does not pass through the zero-sequence current transformer; Controlling the detection branch to short-circuit or shunt the detected branch for a set first stable time, and issuing a failure alarm prompt if the leakage detection device does not output a preset leakage signal; If the leakage detection device outputs a preset leakage signal, a normal prompt is output, and then, according to a preset pulse frequency, within a preset control period, the detection branch is controlled to pulse-type short-circuit or shunt the tested branch, and the number of times the tested branch is short-circuited or shunted is recorded as the number of pulses; The number of times the leakage signal is output by the leakage detection device during the control period is obtained as the triggering number; Calculating the ratio of the number of trigger times to the number of pulses, and taking the percentage of the ratio as the trigger percentage; If the trigger percentage is less than the preset reference percentage, a failure warning prompt is output; If the trigger percentage is greater than a preset reference percentage, a normal prompt is output, and the length of the control period in the next detection step is adjusted in an anti-correlated manner according to the trigger percentage; The higher the trigger percentage is, the shorter the next control period will be; The lower the trigger percentage is, the longer the next control period is; the magnitude of the pulse frequency in the next detection step is adjusted in a positive correlation with the trigger percentage; The higher the trigger percentage is, the higher the pulse frequency will be next time; The lower the trigger percentage is, the lower the pulse frequency will be next time; The detection circuit comprises a relay and a short-circuit resistor, wherein the controlled end of the relay is electrically connected to the control signal output end of the leakage detection device; the execution switch of the relay is connected in parallel between the phase line and the neutral line selected by the detected branch, the short-circuit resistor is connected in series with the execution switch of the relay, and the short-circuit resistor is an adjustable resistor; adjusting the resistance value of the short-circuit resistor according to the trigger percentage; The higher the trigger percentage, the greater the resistance value; The lower the trigger percentage, the smaller the resistance value; According to the change trend of the trigger percentage, calculating the increase amplitude value and the decrease amplitude value of the trigger percentage; If the increase amplitude value of the trigger percentage is greater than the preset increase reference amplitude value, then reducing the pulse duty cycle of the pulse frequency; If the reduction amplitude value of the trigger percentage is greater than the preset reduction reference amplitude value, the pulse duty cycle of the pulse frequency is increased.

2. The working state detection method for a leakage detection device according to claim 1, characterized in that: The method further comprises the steps of: Calculating the severity of fluctuations in the trigger percentage; Adjusting the reference percentage according to the severity of the fluctuation, the higher the severity of the fluctuation, the lower the reference percentage; The lower the fluctuation severity, the higher the reference percentage.

3. The working state detection method for a leakage detection device according to claim 1, characterized in that: The method further comprises the steps of: Based on arbitrarily selecting two-phase branches in a three-phase line as tested branches, the tested branches are respectively a first branch and a second branch; Controlling the detection branch to short-circuit or shunt the first branch and the second branch in sequence; if the leakage detection device does not output a preset leakage signal, issuing a failure alarm prompt; If the leakage detection devices all output a preset leakage signal, a normal prompt is output, and then according to a preset pulse frequency, within a preset control period, the detection branch is controlled to pulse-short-circuit or shunt the first branch and the second branch in succession; Recording the number of times the first branch is short-circuited or shunted as the first pulse number; Acquiring the number of times the leakage signal is output by the leakage detection device within the control period as a first triggering number; Calculating a ratio of the first triggering number to the first pulse number as a first ratio, and taking a percentage of the first ratio as a first triggering percentage; Recording the number of times the second branch is short-circuited or shunted as the second pulse number; Acquiring the number of times the leakage signal is output by the leakage detection device within the control period as a second triggering number; Calculating a ratio of the second triggering number to the second pulse number as a second ratio, and taking a percentage of the second ratio as a second triggering percentage; Calculate an average trigger percentage according to the first trigger percentage and the second trigger percentage; If the average trigger percentage is less than a preset reference percentage, a failure warning prompt is output.

4. The working state detection method for a leakage detection device according to claim 1, characterized in that: The method further comprises the steps of: Based on arbitrarily selecting two-phase branches in a three-phase line as tested branches, the tested branches are respectively a first branch and a second branch; Controlling the detection branch to short-circuit or shunt the first branch and the second branch at the same time; if the leakage detection device does not output a preset leakage signal, issuing a failure alarm prompt; If the leakage detection device outputs a preset leakage signal, a normal prompt is output, and then according to a preset pulse frequency, within a preset control period, the detection branch is controlled to pulse-type simultaneously short-circuit or shunt the first branch and the second branch, and the first branch and the second branch are controlled by the same relay; the number of times the first branch or the second branch is short-circuited or shunted is recorded as the number of simultaneous pulses; The number of times the leakage signal is output by the leakage detection device within the control period is obtained as the number of simultaneous triggering; Calculating the ratio of the number of simultaneous triggers to the number of simultaneous pulses as a simultaneous ratio, and taking the percentage of the simultaneous ratio as a simultaneous trigger percentage; If the simultaneous triggering percentage is less than a preset reference percentage, a failure warning prompt is output.

5. The working state detection method for a leakage detection device according to claim 1, characterized in that: The method further comprises the steps of: Based on the three-phase branches in the three-phase line as the tested branches, the three-phase line includes a first branch, a second branch and a third branch; Controlling the detection branch to short-circuit or shunt the first branch, the second branch and the third branch in sequence; if the leakage detection device does not output a preset leakage signal, issuing a failure alarm prompt; If the leakage detection devices all output a preset leakage signal, a normal prompt is output, and then according to a preset pulse frequency, within a preset control period, the detection branch is controlled to pulse-short-circuit or shunt the first branch, the second branch, and the third branch in sequence; Recording the number of times the first branch is short-circuited or shunted as the first pulse number; Acquiring the number of times the leakage signal is output by the leakage detection device within the control period as a first triggering number; Calculating a first ratio of the first triggering number to the first pulse number, and taking the percentage of the first ratio as a first triggering percentage; Recording the number of times the second branch is short-circuited or shunted as the second pulse number; Acquiring the number of times the leakage signal is output by the leakage detection device within the control period as a second triggering number; Calculating a second ratio of the second triggering number to the second pulse number, and taking the percentage of the second ratio as a second triggering percentage; Recording the number of times the third branch is short-circuited or shunted as the third pulse number; The number of times the leakage signal is output by the leakage detection device within the control period is obtained as a third triggering number; Calculating a third ratio of the third triggering number to the third pulse number, and taking the percentage of the third ratio as a third triggering percentage; An average trigger percentage is calculated according to the first trigger percentage, the second trigger percentage and the third trigger percentage; If the average trigger percentage is less than a preset reference percentage, a failure warning prompt is output.

6. The working state detection method for a leakage detection device according to claim 1, characterized in that: The method further comprises the steps of: Based on the arbitrary selection of 2-phase branches in the three-phase line as the tested branches, the three-phase line includes the first branch, the second branch and the third branch. The tested branches include three situations: Case 1: The tested branches are the first branch and the second branch respectively; The second case: the tested branches are the second branch and the third branch respectively; The third case: the tested branches are the first branch and the third branch respectively; Controlling the detection branch to detect the detected branch in accordance with the first situation, the second situation and the third situation in sequence; In the three detection situations, if the leakage detection device fails to output the preset leakage signal, a failure alarm prompt will be issued; If the leakage detection device outputs the preset leakage signal three times, it outputs a normal prompt, and then according to the preset pulse frequency, within the preset control period, the detection branch is controlled to pulse short-circuit or shunt the detected branch in three situations, and in each case, the detection branch short-circuits or shunts the corresponding branch at the same time: Connect the circuit in the first case, and control the detection branch to simultaneously pulse-short-circuit or shunt the first branch and the second branch within a preset control period according to a preset pulse frequency; the first branch and the second branch are controlled by the same relay; and record the number of times the first branch or the second branch is short-circuited or shunted as the first simultaneous pulse number; The number of times the leakage signal is output by the leakage detection device within the control period is obtained as a first simultaneous triggering number; Calculating a ratio of a first simultaneous triggering number to a first simultaneous pulse number as a first simultaneous ratio, and taking a percentage of the first simultaneous ratio as a first simultaneous triggering percentage; Connecting the circuit in the second case, according to a preset pulse frequency, within a preset control period, controlling the detection branch to simultaneously pulse-circuit or shunt the second branch and the third branch; The second branch and the third branch are controlled by the same relay; the number of times the second branch or the third branch is short-circuited or shunted is recorded as the second simultaneous pulse number; The number of times the leakage signal is output by the leakage detection device within the control period is obtained as the second simultaneous triggering number; Calculating the ratio of the second simultaneous triggering number to the second simultaneous pulse number as a second simultaneous ratio, and taking the percentage of the second simultaneous ratio as a second simultaneous triggering percentage; Connect the circuit in the third case, and control the detection branch to simultaneously pulse-short-circuit or shunt the first branch and the third branch within a preset control period according to a preset pulse frequency; the first branch and the third branch are controlled by the same relay; and the number of times the first branch or the third branch is short-circuited or shunted is recorded as the third simultaneous pulse number; The number of leakage signals output by the leakage detection device during the control period is obtained as the third simultaneous triggering number; the ratio of the third simultaneous triggering number to the third simultaneous pulse number is calculated as the third simultaneous ratio, and the percentage of the third simultaneous ratio is used as the third simultaneous triggering percentage; The average values ​​of the first simultaneous trigger percentage, the second simultaneous trigger percentage and the third simultaneous trigger percentage are calculated to obtain a comprehensive trigger percentage; if the comprehensive trigger percentage is less than a preset reference percentage, a failure warning prompt is output.

7. A working status detection system for a leakage detection device, characterized in that: It comprises a processor, in which the steps of the working state detection method for a leakage detection device as described in any one of claims 1 to 6 are executed.

8. A storage medium, characterized in that: The medium stores a program, and when the program is executed by the processor, the steps of the working state detection method for a leakage detection device described in any one of claims 1 to 6 are implemented.

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