Remotely controllable electric leakage safety protection plug

Abstract

The invention belongs to the technical field of electric leakage safety protection, and discloses a remotely controllable electric leakage safety protection plug, which comprises an electric leakage risk preliminary identification module, a magnetic core saturation risk identification module, an advanced electric leakage risk diagnosis module and an abnormal remote difference control module. By setting a magnetic core saturation and electric leakage risk collaborative diagnosis mechanism, parameters such as direct current offset percentage and the like can be analyzed in real time to judge the magnetic core saturation risk, and then the electric leakage risk judgment result is combined to comprehensively identify the operation refusal risk, trigger voltage and current phase analysis and insulation resistance test, so that the electric leakage detection accuracy is improved, and the operation refusal caused by magnetic core saturation is prevented; and the power utilization safety is ensured. By setting a four-stage progressive diagnosis mechanism of preliminary electric leakage identification, magnetic core risk screening, advanced electric leakage risk diagnosis and differential management and control, electric leakage can be accurately identified, magnetic core saturation refusal operation can be prevented, remote intelligent management and control can be realized, and power utilization safety and management efficiency can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of leakage safety protection, and relates to a remotely controllable leakage safety protection plug. Background Art

[0002] Leakage protection of plugs can quickly cut off the power when the device leaks electricity, prevent electric shock and electrical fires, protect personal safety and equipment, comply with safety specifications, and improve the reliability of power consumption. Traditional leakage protection plugs mainly judge the existence of leakage behavior by detecting the current difference between the live wire and the neutral wire. However, the single current difference judgment mechanism can no longer meet the requirements of leakage abnormality judgment.

[0003] Magnetic core saturation refers to the physical phenomenon that the magnetization intensity reaches the upper limit and cannot be enhanced under the action of a strong magnetic field. Magnetic saturation will break the normal working state of electromagnetic components, and cause an abnormal increase in current by reducing the inductance or increasing the excitation demand. Therefore, the occurrence of magnetic core saturation will directly affect the accuracy of current monitoring, and then reduce the accuracy and timeliness of leakage situation identification, and cannot meet the requirements of modern electricity use safety. Therefore, the research on remotely controllable leakage safety protection plugs based on magnetic core saturation analysis is of great significance.

[0004] Traditional technical solutions lack a collaborative diagnosis mechanism for magnetic core saturation risk and leakage risk, and do not consider the impact of magnetic core saturation on the action reliability of protection devices, which may cause a refusal action risk due to magnetic core saturation.

[0005] Traditional technical solutions lack a multi-level leakage monitoring and verification mechanism, and cannot identify misidentifications caused by transient current interference, reducing the accuracy of fault identification and the effectiveness of result processing, resulting in a poor user experience. Summary of the Invention

[0006] In view of this, in order to solve the problems proposed in the above background art, a remotely controllable leakage safety protection plug is proposed.

[0007] The object of the present invention can be achieved by the following technical solutions: A remotely controllable leakage safety protection plug, comprising: a preliminary leakage risk identification module, which compares the live wire and neutral wire currents in real time, analyzes the current difference situation that does not conform to the preset typical leakage characteristics, and preliminarily judges whether there is a leakage risk.

[0008] A magnetic core saturation risk identification module, which collects the input current of the electrical appliance in real time and then analyzes the DC offset percentage, the 2 / 3 harmonic amplitude ratio, and the total harmonic distortion rate to judge whether there is a magnetic core saturation risk.

[0009] The advanced leakage risk diagnosis module comprehensively identifies whether there is a risk of refusal to operate caused by core saturation based on the leakage risk judgment result and the core saturation risk judgment result. If it exists, it triggers voltage-current phase analysis and insulation resistance testing.

[0010] The abnormal remote differential control module determines whether there is a real leakage risk of the electrical appliance based on the voltage-current phase analysis result and the insulation resistance test result, and formulates and executes differential control according to the judgment result.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By setting up a cooperative diagnosis mechanism for core saturation and leakage risk, the present invention can analyze parameters such as the direct current offset percentage in real time to judge the core saturation risk, and then comprehensively identify the refusal to operate risk in combination with the leakage risk judgment result, trigger voltage-current phase analysis and insulation resistance testing, improve the accuracy of leakage detection, prevent the refusal to operate caused by core saturation, and ensure the safety of electricity use.

[0012] (2) By setting up a four-level progressive diagnosis mechanism of preliminary leakage identification, core risk screening, advanced leakage risk diagnosis, and differential control, the present invention can accurately identify leakage, prevent the refusal to operate of the core, realize remote intelligent control, and improve the safety and management efficiency of electricity use. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a schematic diagram of the connection of each module of the system of the present invention.

[0015] Figure 2 It is a schematic diagram of the voltage-current phase analysis process corresponding to an embodiment provided by the present invention.

[0016] Figure 3 It is a schematic diagram of the insulation resistance test process corresponding to an embodiment provided by the present invention. Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0018] Please refer toFigure 1 As shown in the figure, the present invention provides a remotely controllable leakage safety protection plug, which includes a preliminary leakage risk identification module, a magnetic core saturation risk identification module, an advanced leakage risk diagnosis module, and an abnormal remote differential control module. The preliminary leakage risk identification module is connected to the magnetic core saturation risk identification module, the magnetic core saturation risk identification module is connected to the advanced leakage risk diagnosis module, and the advanced leakage risk diagnosis module is connected to the abnormal remote differential control module.

[0019] The preliminary leakage risk identification module is used to compare the live wire current and the neutral wire current in real time, analyze the current difference situation that does not conform to the preset typical leakage characteristics, and preliminarily judge whether there is a leakage risk.

[0020] It should be noted that the purpose of the preliminary leakage risk identification is to calculate parameters such as the current amplitude difference, change amount, and change degree by real-time monitoring of the live wire and neutral wire currents of the line connected to the safety protection plug. After comparing with the preset threshold, based on the number of unit time durations with the current amplitude difference change degree greater than the threshold and the continuous duration of the current amplitude difference greater than the threshold, corresponding abnormal signals are output, so as to preliminarily judge whether there is a leakage risk, and provide a basis for subsequent accurate determination of the leakage situation and operations such as remotely controlling the power cut-off.

[0021] The specific analysis steps of the preliminary leakage risk identification module in a preferred embodiment of the present invention are as follows: Real-time monitor the live wire current and the neutral wire current of the line connected to the safety protection plug, and then calculate the difference to obtain the current amplitude difference. Discretely collect the current amplitude differences corresponding to several current detection times before the current moment based on the preset unit time duration, and calculate the difference between the current amplitude differences corresponding to adjacent current detection times to obtain the current amplitude difference change amount.

[0022] Calculate the ratio of the current amplitude difference change amount to the preset unit time duration to obtain the current amplitude difference change degree of several unit time durations, and count the number of unit time durations with the current amplitude difference change degree greater than the preset current amplitude difference change degree threshold. If the number of unit time durations is greater than the preset threshold, output an abnormal output signal of typical leakage characteristic one.

[0023] Compare the current amplitude difference with the preset current amplitude difference threshold, calculate the continuous duration of the current amplitude difference greater than the current amplitude difference threshold. If the continuous duration is greater than the preset continuous duration threshold, output an abnormal output signal of typical leakage characteristic two.

[0024] It should be noted that the setting of the change degree threshold of the current amplitude difference and the duration threshold is based on the current fluctuation characteristics during normal grid operation and the electrical signal characteristics of typical leakage scenarios: by collecting a large amount of live wire and neutral wire current data under normal power consumption conditions, analyzing the dynamic change range and fluctuation frequency of the current amplitude difference, the change degree threshold is determined to filter out normal fluctuations. At the same time, the time law of the current difference continuously exceeding the safe range in real leakage faults is statistically analyzed, and combined with the response timeliness requirements of leakage protection, the duration threshold is set to ensure that the threshold can not only avoid misjudgment due to instantaneous interference, but also trigger an early warning in time during real leakage.

[0025] When the abnormal output signals of typical leakage feature one and typical leakage feature two are received simultaneously, it is determined that a leakage has occurred, and the power supply is immediately remotely controlled to be cut off and reported.

[0026] It should be explained that when the signals of typical leakage feature one and feature two are received simultaneously, it indicates that the current in the line not only has abnormal dynamic fluctuations, but also shows a state of continuously exceeding the safe range. The simultaneous occurrence of these two abnormal signals most likely means that a real leakage fault has occurred, rather than instantaneous interference or normal fluctuations.

[0027] When only one of the abnormal output signals of typical leakage feature one or typical leakage feature two is received, it is determined that there is a leakage risk.

[0028] It should be explained that when only a single signal of typical leakage feature one or feature two is received, it indicates that the line current may be in a transitional state of potential leakage or affected by unstable factors. Although a single feature abnormality cannot completely confirm a real leakage fault, it has exceeded the safety threshold of normal power consumption and there is a risk of evolving into a serious leakage. Therefore, it is determined that there is a leakage risk, so that the system can continuously monitor and provide an early warning for subsequent advanced diagnosis, avoiding potential safety hazards caused by missed judgments.

[0029] It should be noted that the reason for choosing the change degree of the current amplitude difference and the duration of the current amplitude difference as typical leakage features is that they can effectively reflect the electrical signal abnormalities of the leakage state from different dimensions. The change degree of the current amplitude difference can capture the abnormal dynamic changes of current fluctuations. When a leakage occurs in the line, the current distribution will be affected by the leakage path and produce irregular fluctuations, resulting in the change degree exceeding the normal range. And the duration of the current amplitude difference can reflect the persistence of the leakage state. If the current difference between the live wire and the neutral wire continuously exceeds the threshold, it indicates that there is a stable leakage path. The combination of the two can accurately distinguish instantaneous interference from real leakage risks through the dual verification of dynamic fluctuation characteristics and continuous abnormal states, improving the reliability and accuracy of leakage identification.

[0030] The core saturation risk identification module is used to collect the input current of the electrical appliance in real time, and then analyze the DC offset percentage, the 2 / 3 harmonic amplitude ratio, and the total harmonic distortion rate to determine whether there is a core saturation risk.

[0031] It should be noted that the purpose of the core saturation risk identification module is to collect the input current of the electrical appliance in real time, analyze parameters such as the DC offset percentage, the 2 / 3 harmonic amplitude ratio, and the total harmonic distortion rate, compare them with the preset thresholds, and determine whether there is a core saturation risk, so as to provide a basis for identifying the risk of refusal to operate caused by core saturation in subsequent advanced leakage risk diagnosis, avoid the normal operation of the leakage protection plug being affected by core saturation, and ensure electrical safety.

[0032] In a preferred embodiment of the present invention, the specific analysis method of the DC offset percentage is as follows: The adaptive filtering technology is used to process the high-frequency noise and periodic interference in the input current of the electrical appliance to obtain the preprocessed input current.

[0033] The sliding window length is dynamically adjusted according to the power grid power frequency, and discrete current monitoring points are selected for the sliding window at equal intervals of time.

[0034] It should be noted that dynamically adjusting the sliding window length according to the power grid power frequency and equally spacing the selection of discrete current monitoring points are mainly to adapt to the power grid frequency fluctuation and ensure the accuracy and periodicity of current signal acquisition. The power grid power frequency may have a small fluctuation due to load changes. Dynamically adjusting the sliding window length can make the window cover a complete signal cycle. For example, when the power frequency is slightly higher than 50Hz, the window length is shortened, and when it is slightly lower than 50Hz, the window length is extended to ensure that each window contains an integer number of fundamental wave cycles and avoid signal analysis errors caused by incomplete cycles.

[0035] The mean value of the preprocessed input current is calculated through the sliding window to obtain the DC component, and the difference between the input current within the sliding window and the DC component is calculated to obtain the AC component. Then, the effective values of the DC component and the AC component are calculated respectively.

[0036] The ratio of the effective value of the DC component to the effective value of the AC component is calculated to obtain the DC offset percentage.

[0037] In a preferred embodiment of the present invention, the specific calculation method of the 2 / 3 harmonic amplitude ratio: The 2nd harmonic frequency and the 3rd harmonic frequency are obtained based on the power grid power frequency, and the 2nd harmonic component and the 3rd harmonic component are obtained through Fourier transform based on the 2nd harmonic frequency and the 3rd harmonic frequency.

[0038] The local spectrum maximum value is extracted through a preset dynamic sliding window as the amplitude of the corresponding harmonic, and then the 2nd harmonic amplitude and the 3rd harmonic amplitude are obtained.

[0039] Calculate the ratio of the second harmonic amplitude to the third harmonic amplitude to obtain the 2 / 3 harmonic amplitude ratio.

[0040] In a preferred embodiment of the present invention, the specific calculation method of the total harmonic distortion rate is as follows: Perform five-layer wavelet decomposition on the input current signal to obtain each harmonic component.

[0041] Calculate the harmonic effective value corresponding to each harmonic component, and at the same time calculate the fundamental wave effective value.

[0042] Use the formula to calculate the total harmonic distortion rate , where represents the harmonic effective value corresponding to each harmonic component, represents the fundamental wave effective value, represents the harmonic component number, , represents the number of harmonic components, .

[0043] In a preferred embodiment of the present invention, the specific method for determining whether there is a risk of magnetic core saturation is as follows: Compare the DC offset percentage, 2 / 3 harmonic amplitude ratio, and total harmonic distortion rate with the pre-set DC offset percentage threshold, 2 / 3 harmonic amplitude ratio threshold, and total harmonic distortion rate threshold respectively.

[0044] It should be noted that the setting of the DC offset percentage threshold, 2 / 3 harmonic amplitude ratio threshold, and total harmonic distortion rate threshold is based on the saturation characteristic curve of the magnetic core material and the current characteristic parameters during normal operation: By testing the current signals of the magnetic core at different saturation levels, determine the critical values of the DC component ratio, the amplitude ratio of the second and third harmonics, and the total harmonic distortion rate. Combining with the current parameter fluctuation range during normal grid operation, set a threshold slightly higher than the maximum value under normal working conditions to ensure that the threshold can avoid false alarms caused by normal grid fluctuations and can trigger a risk warning in time when the magnetic core is approaching saturation.

[0045] If any of the DC offset percentage, 2 / 3 harmonic amplitude ratio, and total harmonic distortion rate is greater than or equal to the corresponding threshold, it is determined that there is a risk of magnetic core saturation; otherwise, it is determined that there is no risk of magnetic core saturation.

[0046] It should be noted that the DC offset percentage, the 2 / 3 harmonic amplitude ratio, and the total harmonic distortion rate respectively reflect the core saturation characteristics from different dimensions. When any parameter exceeds the corresponding threshold, it indicates that abnormal changes related to core saturation have occurred in the current signal. Any one of the three situations can be regarded as a potential signal of core saturation. The OR logic is used to avoid the risk of missed judgment due to a single parameter not being captured. During the core saturation process, the changes of different parameters may have a sequence or primary-secondary difference. For example, early saturation may only be manifested as an abnormal amplitude of a certain harmonic, while the total harmonic distortion rate increases later. Therefore, as long as any parameter breaks through the threshold, the risk can be determined, ensuring timely warning at different stages of core saturation and improving the reliability of the protection plug.

[0047] It should be noted that the reason for choosing the DC offset percentage, the 2 / 3 harmonic amplitude ratio, and the total harmonic distortion rate as the basis for judging the core saturation risk is that these three parameters can reflect the current signal characteristics during core saturation from different dimensions: 1. DC offset percentage: When the core is saturated, the DC component in the exciting current will increase significantly, resulting in a DC offset in the current signal. This parameter can directly reflect the influence degree of the DC component on the AC component.

[0048] 2. 2 / 3 harmonic amplitude ratio: Core saturation will cause the current waveform to be distorted, and the amplitudes of the 2nd and 3rd harmonic components will show specific change rules. Their ratio can effectively reflect the characteristics of waveform distortion.

[0049] 3. Total harmonic distortion rate: It comprehensively represents the overall distortion degree of each harmonic in the current. When the core is saturated, the total harmonic distortion rate will increase significantly, which can be used as an important indicator for judging whether the core is saturated.

[0050] The combination of the three can form a multi-dimensional verification from the DC component, the specific harmonic ratio, and the overall distortion degree, improving the accuracy of core saturation risk identification.

[0051] It should be noted that the present invention can analyze parameters such as the DC offset percentage in real time through the setting of a collaborative diagnosis mechanism for core saturation and leakage risk, and then comprehensively identify the risk of refusal to operate in combination with the leakage risk judgment result, trigger the voltage-current phase analysis and insulation resistance test, improve the accuracy of leakage detection, prevent refusal to operate caused by core saturation, and ensure electrical safety.

[0052] The advanced leakage risk diagnosis module is used to comprehensively identify whether there is a risk of refusal to operate caused by core saturation based on the leakage risk judgment result and the core saturation risk judgment result. If it exists, it triggers the voltage-current phase analysis and insulation resistance test.

[0053] In a preferred embodiment of the present invention, the specific method for comprehensively identifying whether there is a risk of refusal to operate caused by core saturation is as follows: Extract the leakage risk judgment result and the core saturation risk judgment result.

[0054] When it is determined that there is a risk of electric leakage and a risk of magnetic core saturation, further identify the risk of refusal to operate caused by magnetic core saturation.

[0055] It should be explained that when the system determines that there is a risk of electric leakage, and at the same time the magnetic core saturation risk identification module also determines that there is a risk of magnetic core saturation, it indicates that the magnetic core may affect the normal operation of the electric leakage protection device due to saturation. For example, magnetic core saturation will cause the sensitivity of the current transformer to decrease, which may prevent the electric leakage protection plug from cutting off the power supply in time when electric leakage occurs, thus forming a risk of refusal to operate. At this time, it is necessary to further trigger voltage-current phase analysis and insulation resistance testing to verify the true electric leakage state.

[0056] When it is determined that there is a risk of electric leakage and it is determined that there is no risk of magnetic core saturation, further identify that there is no risk of refusal to operate caused by magnetic core saturation.

[0057] It should be explained that if the system determines that there is a risk of electric leakage, but the magnetic core saturation risk identification module determines that there is no risk of magnetic core saturation, it means that the magnetic core is in a normal working state, and the action mechanism of the electric leakage protection plug is not affected by the magnetic core. Therefore, it can be directly determined that there is no risk of refusal to operate caused by magnetic core saturation, and no additional testing is required.

[0058] In a preferred embodiment of the present invention, please refer to Figure 2 、 Figure 3 As shown, the specific analysis methods of the voltage-current phase analysis and insulation resistance testing are as follows: A1. Collect the live wire voltage signal and neutral wire current signal of the electrical appliance, use a filter to remove high-order noise interference, calculate the mean value based on the preset monitoring window length to obtain the DC component, and then remove the corresponding DC components from the live wire voltage signal and neutral wire current signal respectively to obtain the voltage AC signal and current AC signal.

[0059] A2. Locate each zero point in the voltage AC signal and current AC signal within the monitoring window, and obtain the corresponding moments of each zero point in the voltage AC signal and current AC signal. Substitute the moments into the formula Analyze to obtain the voltage-current phase difference corresponding to each zero point , where represents the fundamental wave period, represents the moment of each zero point in the current AC signal, represents the moment of each zero point in the voltage AC signal.

[0060] A3. Calculate the mean value of the voltage-current phase differences corresponding to each zero point within the monitoring window to obtain the voltage-current phase difference, and then compare it with the rated load phase difference of the electrical appliance. If the voltage-current phase difference is less than the rated load phase difference, output a qualified signal for voltage-current phase analysis.

[0061] B1. Cut off the main circuit of the electrical appliance through a solid-state relay and close the relay of the test circuit. Collect the voltage difference between the corresponding neutral wire and the ground wire after the main circuit of the electrical appliance is cut off and compare it with the preset voltage difference threshold. When the voltage difference is less than the voltage difference threshold, the insulation resistance test is allowed; otherwise, the test is terminated and reported to the administrator.

[0062] B2. Extract the corresponding rated voltage from the electrical appliance instruction manual. Set the test voltage based on the rated voltage. Apply the test voltage to the electrical appliance based on the preset test duration. Use a high-precision micro-current sensor to collect the ground wire leakage current signal and obtain the corresponding effective leakage current value.

[0063] B3. Calculate the ratio of the test voltage to the effective leakage current value to obtain the internal resistance of the test circuit. Compare the internal resistance of the test circuit with the rated insulation resistance of the electrical appliance. If the internal resistance of the test circuit is greater than or equal to the rated insulation resistance, output a qualified signal for the insulation resistance test.

[0064] It should be noted that by verifying whether the load characteristics of the electrical equipment are normal through voltage-current phase analysis and directly detecting the insulation performance of the equipment in combination with the insulation resistance test, the two tests complement each other, providing the final basis for judging whether there is a real leakage risk in the electrical appliance and avoiding misjudgment or refusal to operate caused by magnetic core saturation.

[0065] The abnormal remote difference control module is used to judge whether there is a real leakage risk in the electrical appliance based on the results of voltage-current phase analysis and insulation resistance test, and formulate and execute differential control according to the judgment results.

[0066] In a preferred embodiment of the present invention, the specific process of judging whether there is a real leakage risk in the electrical appliance is as follows: If the abnormal remote difference control module simultaneously collects a qualified signal for voltage-current phase analysis and a qualified signal for insulation resistance test, it is judged that there is no real leakage risk in the electrical appliance; otherwise, it is judged that there is a real leakage risk in the electrical appliance.

[0067] It needs to be further explained that when the abnormal remote difference control module simultaneously collects a qualified signal for voltage-current phase analysis and a qualified signal for insulation resistance test, it indicates that the load phase characteristics of the electrical appliance are normal and the insulation performance is good, and it can be determined that there is no real leakage risk. This is because the qualified phase indicates that the phase relationship between the current and voltage conforms to the rated load characteristics, and the qualified insulation resistance directly proves that there is no low-resistance path required for the equipment to leak electricity. The double verification ensures the reliability of the conclusion.

[0068] If the two qualified signals are not satisfied simultaneously, that is, only one is satisfied or neither is satisfied, it is determined that there is a real leakage risk. For example, if the phase analysis is unqualified but the insulation resistance is qualified, there may be a leakage path caused by non-insulation breakage. If the insulation resistance is unqualified, regardless of whether the phase is qualified or not, it indicates that the insulation performance of the equipment has deteriorated and there is a leakage hazard. At this time, it is necessary to combine subsequent differential control measures to avoid risk escalation.

[0069] This determination process combines the preliminary leakage risk judgment with the detection of the actual electrical characteristics of the equipment through a dual-signal cross-verification mechanism, effectively eliminating misjudgments caused by interference factors such as core saturation, and ensuring the accurate identification of real leakage risks.

[0070] In a preferred embodiment of the present invention, the specific manner of formulating and implementing differential control for the judgment result is as follows: when it is determined that the electrical appliance does not have a real leakage risk, the power consumption safety of the system is continuously monitored.

[0071] It should be noted that when it is determined that the electrical appliance does not have a real leakage risk, the system maintains a continuous monitoring state. At this time, the leakage risk preliminary identification module and the core saturation risk identification module continue to collect current data in real time, dynamically tracking the operating state of the electrical equipment, ensuring that any new abnormalities can be captured in a timely manner during subsequent operation, forming a closed-loop management of monitoring-warning-treatment, avoiding interference with normal power consumption while ensuring safety.

[0072] When it is determined that the electrical appliance has a real leakage risk, if the abnormal remote differential control module collects one of the voltage-current phase analysis qualified signal and the insulation resistance test qualified signal, the voltage-current phase analysis and the insulation resistance test are triggered again. If the abnormal remote differential control module does not collect any of the voltage-current phase analysis qualified signal and the insulation resistance test qualified signal, the power supply is immediately disconnected and reported to the administrator.

[0073] It should be noted that if it is determined that there is a real leakage risk, but the abnormal remote differential control module only collects one of the voltage-current phase analysis qualified signal or the insulation resistance test qualified signal, it indicates that the fault may be temporary or unstable, such as instantaneous interference causing phase abnormality, or accidental error during the test. At this time, the system triggers a retest mechanism: perform the voltage-current phase analysis and the insulation resistance test again, and verify the consistency of the results through repeated detection. If both are qualified after retesting, the risk is eliminated. If there is still a single signal unqualified, continue to the next step of control.

[0074] It should be noted that if the abnormal remote difference control module fails to collect any qualified signal, that is, both the phase analysis and the insulation resistance test are unqualified, it indicates that there are obvious hidden dangers of electric leakage in the electrical appliance, such as serious insulation damage and a stable leakage path. At this time, the system immediately takes emergency measures: 1. Remotely disconnect the power supply to cut off the leakage path and avoid safety accidents such as electric shock and fire.

[0075] 2. Synchronously report the fault information to the administrator, along with specific detection data, such as the phase difference value and the insulation resistance value, to provide an accurate basis for subsequent fault troubleshooting and achieve a rapid response of risk identification - emergency disposal - information synchronization.

[0076] It should be noted that through the four - level progressive diagnosis mechanism of preliminary electric leakage identification, magnetic core risk screening, advanced electric leakage risk diagnosis, and differential control, the present invention can accurately identify electric leakage, prevent magnetic core saturation and refusal to operate, achieve remote intelligent control, and improve the safety and management efficiency of electricity use.

[0077] The above content is only an example and explanation of the concept of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they should fall within the protection scope of the present invention.

Claims

1. A remotely controllable leakage safety protection plug, characterized in that, Including: A preliminary leakage risk identification module that compares the live wire current and the neutral wire current in real time, analyzes the current difference situation that does not conform to the preset typical leakage characteristics, and preliminarily judges whether there is a leakage risk; A core saturation risk identification module that collects the input current of the electrical appliance in real time and then analyzes the DC offset percentage, the 2 / 3 harmonic amplitude ratio, and the total harmonic distortion rate to judge whether there is a core saturation risk; An advanced leakage risk diagnosis module that comprehensively identifies whether there is a risk of refusal to operate caused by core saturation based on the leakage risk judgment result and the core saturation risk judgment result. If it exists, it triggers voltage-current phase analysis and insulation resistance testing; An abnormal remote differential control module that judges whether there is a real leakage risk of the electrical appliance based on the voltage-current phase analysis result and the insulation resistance test result, and formulates and executes differential control according to the judgment result.

2. The leakage safety protection plug capable of remote control according to claim 1, characterized in that: The specific analysis steps of the preliminary leakage risk identification module are as follows: Monitor the live wire current and the neutral wire current of the line connected to the safety protection plug in real time, and then calculate the difference to obtain the current amplitude difference. Discretely collect the current amplitude differences corresponding to several current detection times before the current moment based on the preset unit time length, and calculate the difference between the current amplitude differences corresponding to adjacent current detection times to obtain the current amplitude difference change amount; Calculate the ratio of the current amplitude difference change amount to the preset unit time length to obtain the current amplitude difference change degree of several unit time lengths, and count the number of unit time lengths in which the current amplitude difference change degree is greater than the preset current amplitude difference change degree threshold. If the number of unit time lengths is greater than the preset threshold, output an abnormal output signal of typical leakage characteristic one; Compare the current amplitude difference with the preset current amplitude difference threshold, calculate the duration during which the current amplitude difference is greater than the current amplitude difference threshold. If the duration is greater than the preset duration threshold, output an abnormal output signal of typical leakage characteristic two; When receiving both the abnormal output signal of typical leakage characteristic one and the abnormal output signal of typical leakage characteristic two at the same time, it is determined that a leakage has occurred, and the power supply is immediately remotely controlled to be cut off and reported; When only receiving one of the abnormal output signal of typical leakage characteristic one or the abnormal output signal of typical leakage characteristic two, it is determined that there is a leakage risk.

3. The leakage safety protection plug capable of remote control according to claim 1, wherein: The specific analysis method of the DC offset percentage is as follows: Use an adaptive filtering technique to process the high-frequency noise and periodic interference in the input current of the electrical appliance to obtain the preprocessed input current; Dynamically adjust the sliding window length according to the power grid power frequency, and select discrete current monitoring points for the sliding window based on equal interval time; Calculate the mean value of the preprocessed input current through the sliding window to obtain the DC component, and calculate the difference between the input current within the sliding window and the DC component to obtain the AC component, and then calculate the effective values of the DC component and the AC component respectively; Calculate the ratio of the effective value of the DC component to the DC component of the AC component to obtain the DC offset percentage.

4. The leakage safety protection plug capable of remote control according to claim 1, characterized in that: The specific calculation method of the 2 / 3 harmonic amplitude ratio: Obtain the 2nd harmonic frequency and the 3rd harmonic frequency based on the power grid power frequency, and obtain the 2nd harmonic component and the 3rd harmonic component through Fourier transform based on the 2nd harmonic frequency and the 3rd harmonic frequency; Extract the local spectrum maximum value through a preset dynamic sliding window as the amplitude of the corresponding harmonic, and then obtain the amplitude of the second harmonic and the amplitude of the third harmonic; Calculate the ratio of the amplitude of the second harmonic to the amplitude of the third harmonic to obtain the 2 / 3 harmonic amplitude ratio.

5. The leakage safety protection plug capable of remote control according to claim 1, characterized in that: The specific calculation method of the total harmonic distortion rate is as follows: Perform 5-layer wavelet decomposition on the input current signal to obtain each harmonic component; Calculate the effective harmonic value corresponding to each harmonic component, and at the same time calculate the fundamental effective value; Based on the fundamental effective value and using the total harmonic distortion rate calculation formula, calculate the total harmonic distortion rate.

6. The remotely controllable leakage safety protection plug according to claim 2, characterized in that: The specific method for judging whether there is a risk of core saturation is as follows: Compare the DC offset percentage, 2 / 3 harmonic amplitude ratio, and total harmonic distortion rate with the preset DC offset percentage threshold, 2 / 3 harmonic amplitude ratio threshold, and total harmonic distortion rate threshold respectively; If any of the DC offset percentage, 2 / 3 harmonic amplitude ratio, and total harmonic distortion rate is greater than or equal to the corresponding threshold, it is determined that there is a risk of core saturation, otherwise, it is determined that there is no risk of core saturation.

7. The remotely controllable leakage safety protection plug according to claim 6, characterized in that: The specific method for comprehensively identifying whether there is a risk of refusal to operate due to core saturation is as follows: Extract the leakage risk judgment result and the core saturation risk judgment result; If it is determined that there is a leakage risk and it is determined that there is a core saturation risk, further identify that there is a risk of refusal to operate due to core saturation; If it is determined that there is a leakage risk and it is determined that there is no core saturation risk, then further identify that there is no risk of refusal to operate due to core saturation.

8. The leakage safety protection plug capable of remote control according to claim 1, characterized in that: The specific analysis methods of the voltage-current phase analysis and the insulation resistance test are as follows: A1. Collect the live wire voltage signal and the neutral wire current signal of the electrical appliance, use a filter to remove high-order noise interference, perform mean value calculation based on the preset monitoring window length to obtain the DC component, and then remove the corresponding DC component from the live wire voltage signal and the neutral wire current signal respectively to obtain the voltage AC signal and the current AC signal; A2. Locate each zero point in the voltage AC signal and the current AC signal within the positioning monitoring window, and obtain the moments corresponding to each zero point in the voltage AC signal and the current AC signal. Substitute the moments into the formula Analyze to obtain the voltage-current phase difference corresponding to each zero point , where represents the fundamental wave period, represents the moments of each zero point in the current AC signal, represents the moments of each zero point in the voltage AC signal; A3. Perform mean value calculation on the voltage-current phase differences corresponding to each zero point within the monitoring window to obtain the voltage-current phase difference, and then compare it with the rated load phase difference of the electrical appliance. If the voltage-current phase difference is less than the rated load phase difference, output a qualified signal for the voltage-current phase analysis; B1. Cut off the main circuit of the electrical appliance through a solid-state relay and close the test circuit relay, collect the voltage difference between the neutral wire and the ground wire after the main circuit of the electrical appliance is cut off and compare it with the preset voltage difference threshold. When the voltage difference is less than the voltage difference threshold, the insulation resistance test is allowed, otherwise, the test is terminated and reported to the administrator; B2. Extract the corresponding rated voltage from the electrical appliance instruction manual, set the test voltage based on the rated voltage, apply the test voltage to the electrical appliance based on the preset test duration, use a high-precision micro-current sensor to collect the ground wire leakage current signal, and obtain the corresponding leakage current effective value; B3. Calculate the ratio of the test voltage to the leakage current effective value to obtain the internal resistance of the test circuit, and compare the internal resistance of the test circuit with the rated insulation resistance of the electrical appliance. If the internal resistance of the test circuit is greater than or equal to the rated insulation resistance, output a qualified signal for the insulation resistance test.

9. The remotely controllable leakage safety protection plug according to claim 8, characterized in that: The specific process of determining whether there is a real leakage risk in the electrical appliance is as follows: If the abnormal remote differential control module simultaneously collects a qualified signal from the voltage-current phase analysis and a qualified signal from the insulation resistance test, it is determined that the electrical appliance does not have a real leakage risk; otherwise, it is determined that the electrical appliance has a real leakage risk.

10. The remotely controllable leakage safety protection plug according to claim 9, characterized in that: The specific method of formulating and implementing differential control according to the judgment result is as follows: When it is determined that the electrical appliance does not have a real leakage risk, continuously monitor the electrical safety of the system; When it is determined that the electrical appliance has a real leakage risk, if the abnormal remote differential control module collects one of the qualified signal from the voltage-current phase analysis and the qualified signal from the insulation resistance test, re-trigger the voltage-current phase analysis and the insulation resistance test. If the abnormal remote differential control module does not collect any of the qualified signal from the voltage-current phase analysis and the qualified signal from the insulation resistance test, immediately cut off the power supply and report to the administrator.

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