Arc light warning method and system for power distribution cabinet

Abstract

The present invention relates to the technical field of safety monitoring of electric power equipment, and provides an arc warning method for a power distribution cabinet, the method comprising the following steps: obtaining the constant magnetic time according to the magnetic field strength at the location of the arc sensor; obtaining the arc intensity of the arc sensor under the constant magnetic time, and calculating the true value of the arc intensity; performing arc excessive detection according to the true value of the arc intensity to obtain the constant average arc intensity, and calculating the constant off arc excessive value according to the constant average arc intensity; obtaining the constant magnetic current size of the constant magnetic time and calculating the warning current fixed value according to the constant magnetic current size and the constant off arc excessive value; comparing with the warning current fixed value and the constant off arc excessive value, and issuing a warning signal according to the comparison result. The over-protection index can be dynamically adjusted under different magnetic field environment conditions, reducing false alarms caused by magnetic field interference and instantaneous fluctuations, and ensuring timely and accurate detection of arc faults.

Description

Technical Field

[0001] The present invention relates to the technical field of safety monitoring of electric power equipment, and in particular to an arc light early warning method and system for a power distribution cabinet. Background Art

[0002] Chinese patent publication number CN112072784B "A distribution cabinet arc light monitoring and early warning device and its monitoring and early warning method" proposes a method for estimating the arc light intensity based on the real-time monitoring value and change of the arc light intensity, and performing secondary over-value judgment and early warning, and using three adjacent continuous branches The arc light intensity exceeds the value and the duration exceeds the value and has a certain operating current. The linkage arc light fire protection module judgment and start-up method; however, since the distribution cabinet is often in an unstable magnetic field environment, the magnetic field interference will introduce additional electromagnetic noise, and it will be superimposed on the arc light intensity signal, causing the signal noise to increase, and this noise comes from the radiation of electromagnetic waves or electromagnetic interference sources, which will interfere with the sensor Normal operation; the increase of noise will reduce the signal-to-noise ratio of the signal, so that the real arc intensity signal is masked, increasing the risk of false alarm and missed alarm, and affecting the accuracy of fault detection. Therefore, magnetic field interference may cause the sensitivity of the arc sensor to decrease, especially in a strong magnetic field environment, the internal electronic components of the sensor may be disturbed, thereby affecting its ability to respond to weak arc intensity signals. The reduction of sensor sensitivity will lead to a decrease in the detection ability of arc intensity signals and current values, and some weak arc intensity signals will be missed, resulting in the measured arc intensity being lower than the actual arc intensity, affecting the reliability of the overall monitoring system, and resulting in the failure to timely safety warning when the arc intensity exceeds the limit. Summary of the invention

[0003] The purpose of the present invention is to propose an arc light warning method for a distribution cabinet to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The present invention provides an arc light early warning method for a power distribution cabinet, which can dynamically adjust the over-protection index under different magnetic field environment conditions, reduce false alarms caused by magnetic field interference and instantaneous fluctuations, and ensure timely and accurate detection of arc faults.

[0005] In order to achieve the above object, according to one aspect of the present invention, a method for arc light warning of a distribution cabinet is provided, the method comprising the following steps:

[0006] S100, obtaining the magnetic field strength at the location of the arc sensor, and obtaining the constant magnetic time according to the magnetic field strength at the location of the arc sensor;

[0007] S200, obtaining the arc intensity of the arc sensor under the constant magnetization time, and calculating the real value of the arc intensity;

[0008] S300, performing arc excessive detection according to the real value of arc intensity to obtain a constant average arc intensity, and calculating a constant-off arc excessive value according to the constant average arc intensity;

[0009] S400, obtaining the magnitude of the constant magnetic current during the constant magnetic time and calculating the warning current constant value according to the magnitude of the constant magnetic current and the constant breaking arc excessive value;

[0010] S500 monitors the current size and the measured values ​​of each arc sensor in real time, and compares them with the warning current set value and the constant arc breaking excessive value, and issues a warning signal based on the comparison result.

[0011] Among them, the distribution cabinet arc light warning method is realized by the distribution cabinet arc light monitoring and warning device, which includes a distribution cabinet shell, a voltage and current transformer installed in the main incoming line circuit in the distribution cabinet shell, a current transformer installed in each branch circuit in the distribution cabinet shell, an arc sensor installed in the main incoming line circuit and each branch in the distribution cabinet shell, an intelligent fire extinguishing material integrated patch fire fighting module installed at different positions in the distribution cabinet shell, and a measurement and control unit chassis installed in the distribution cabinet shell. A computer hardware motherboard and a storage module, a designed embedded software analysis module, a hardware module analog interface and a switch interface are installed in the measurement and control unit chassis. The hardware module analog interface and the switch interface are respectively connected to the voltage and current transformer, the arc sensor, and the intelligent fire extinguishing material integrated patch fire fighting module through different data lines and receive their data. Then enter the software analysis module embedded in the measurement and control unit chassis. The software analysis module includes a CPU comprehensive analysis module, an early warning judgment module, a fire output module, and a remote background display operation module. The CPU comprehensive analysis module analyzes, calculates, and stores the sampled voltage, current, and arc light data, and then sends the calculated data to the early warning judgment module. The early warning judgment module determines whether the voltage, current, and arc light exceed the value. If they exceed the value, the early warning is activated and enters the fire output module. After the fire output module confirms, it enters the protection and starts the fire, and sends a control instruction through the computer. Then, it is connected through the switch channel to start the peripheral switch. The running alarm information and switch action status can be seen on the display screen of the remote background display operation module. The remote background display operation module is an operating keyboard and display, which is connected to the computer hardware motherboard in the measurement and control unit chassis.

[0012] Further, in step S100, the magnetic field strength at the location of the arc sensor is obtained, and the constant magnetic time is obtained according to the magnetic field strength at the location of the arc sensor;

[0013] Wherein, a Hall sensor is arranged on the arc sensor for measuring the magnetic field intensity at the location of the arc sensor.

[0014] Specifically, the average magnetic field strength of each arc sensor in each time interval T is obtained through the Hall sensor, and the average magnetic field strength is the average value of all instantaneous magnetic field strengths in units of seconds in the time interval, where the time interval T is set to [0.5, 5] seconds; Mag(Tj) is recorded as the total magnetic field strength received by all arc sensors in Tj, where Tj = [(j-1)*T, j*T], j = 1, 2, ..., H, H∈[5, 100]; the minimum value of each Mag(Tj) is obtained and recorded as Mag(Tz), and Tz is recorded as the constant magnetic time, z∈[1, H].

[0015] Because magnetic field interference will introduce additional electromagnetic noise, and it will be superimposed on the arc intensity signal, causing the signal noise to increase. This noise comes from the radiation of electromagnetic waves or electromagnetic interference sources, which will interfere with the normal operation of the sensor; and the increase in noise will reduce the signal-to-noise ratio of the signal, so that the real arc intensity signal is covered up, increasing the risk of false alarms and missed alarms, and affecting the accuracy of fault detection. In addition, magnetic field interference may cause the sensitivity of the arc sensor to decrease, especially in a strong magnetic field environment, the internal electronic components of the sensor may be disturbed, thereby affecting its ability to respond to weak arc intensity signals. The reduction in sensor sensitivity will lead to a decrease in the detection ability of arc intensity signals and current values, and some weak arc intensity signals will be missed, resulting in the measured arc intensity being lower than the actual arc intensity, affecting the reliability of the overall monitoring system, and resulting in the inability to issue a timely and safe warning when the arc intensity exceeds the limit. In order to solve this problem, it is necessary to correct the detected arc intensity according to the magnetic field conditions of the distribution box, obtain the real arc intensity, the arc intensity that needs to be warned, and the current size that needs to be warned, and make an accurate warning.

[0016] In step S200, the process of obtaining the arc intensity of the arc sensor under the constant magnetization time and calculating the true value of the arc intensity includes:

[0017] The number of arc sensors is obtained as G, i represents the serial number of the arc sensor, Arc(Tz, i) represents the arc intensity value in the arc sensor with serial number i in the time period Tz, i=1, 2, ..., G, the maximum arc intensity value of each arc sensor in all arc sensors in the time period Tz is obtained and recorded as ArcM, and the minimum arc intensity value is recorded as ArcU; the real value of the arc intensity is recorded as ARCP, and the calculation method of ARCP is:

[0018]

[0019] Among them, the constant magnetic time is found out through the time interval of the minimum value of the average magnetic field strength. Obtaining the constant magnetic time can obtain the most accurate arc intensity data within the time period with the minimum magnetic field interference. The true value of the arc intensity is obtained after the above correction and calibration steps, which reflects the accurate intensity value of the actual arc intensity signal of the distribution cabinet as a whole during the constant magnetic time. The corrected calculation process not only improves the accuracy of the fault detection system, but also reduces the risk of false alarms and missed alarms, ensuring timely and accurate identification and response to arc events.

[0020] The beneficial effect of this step is: by measuring and correcting the influence of magnetic field interference on arc intensity signal, the interference of noise on arc intensity measurement is reduced. In this way, an arc intensity closer to the true value can be obtained, thereby reducing the possibility of false alarm and missed alarm, improving the accuracy of fault detection, and by calculating the true arc intensity value, the severity of arc events can be more accurately assessed, which helps to issue an alarm in time when the true arc intensity is excessive and take necessary safety measures. In addition, by accurately calculating the true value of arc intensity through constant magnetic time, the error accumulation caused by noise in the signal in the system can be effectively reduced, making the overall monitoring system more stable and reliable, ensuring that the distribution system can respond to potential arc faults in time during operation, and ensuring the safe operation of the power system.

[0021] Further, in step S300, arc excessive detection is performed according to the real value of arc intensity to obtain constant average arc intensity, and the constant-off arc excessive value is calculated according to the constant average arc intensity, including:

[0022] S301, creating an arc excessive detection storage sequence.

[0023] Specifically, an integer variable x is initialized with an initial value of 1, and the range of x is [1, G]. Then, two zero-value variables ADA and ADB and two blank sequences FgA and FgB are created, where sequence FgB is an arc flash excessive detection storage sequence.

[0024] S302, performing arc excessive detection and analysis on the arc intensity during the constant magnetization time, and importing the analyzed arc intensity value into an arc excessive detection storage sequence.

[0025] Specifically, the value of ADA is calculated, which is equal to the result of subtracting Arc(Tz, i) from ARCP, and the value of ADB is calculated, which is equal to the result of subtracting ArcU from Arc(Tz, i). Subsequently, the values ​​of ADA and ADB are compared. If ADA is greater than ADB, the value of Arc(Tz, i) corresponding to the current variable x is added to the sequence FgA. If ADA is less than or equal to ADB, the value of Arc(Tz, i) corresponding to the current variable x is added to the sequence FgB.

[0026] S303, determine whether the arc excessive detection is completed, if completed, extract the sequence of the arc excessive detection storage sequence and jump to S304, if not completed, return to S302.

[0027] The method for judging whether the arc excessive detection is completed is as follows: check whether the value of the current variable x is less than M. If so, set x=x+1 and return to step S403. If the value of the current variable x is equal to M, create a blank array ARCV, import the elements of the sequence FgB into the array ARCV, and continue to step S405.

[0028] S304, averaging the data in the array ARCV to obtain a constant average arc intensity ArcK, and calculating the arc excess intensity Arcand, wherein the arc excess intensity Arcand = |ARCP-ArcK|, wherein || is an absolute value sign.

[0029] Among them, the constant average arc intensity ArcK is used to indicate the overall level of arc intensity during the constant magnetic time. The constant average arc intensity ArcK can reduce the impact of instantaneous noise and interference on the detection results and improve the stability and reliability of the detection by averaging the arc intensities screened out by the arc excessive detection. The arc excessive intensity Arcand is used to quantify the extent to which the arc intensity exceeds the normal range. By calculating the arc excessive intensity, the severity of the arc excessive intensity can be judged more accurately.

[0030] S305, calculating the constant-break arc excess value according to the arc excess intensity; wherein the constant-break arc excess value ArcW = ArcM-Arcand;

[0031] Among them, the constant-off arc excess value ArcW is used to comprehensively evaluate the excessive arc intensity and is a key indicator for triggering early warning or taking safety measures. By subtracting the maximum arc intensity from the excess intensity to fit the judgment indicator of excessive arc intensity under unstable magnetic field, the noise generated by harmonic deformation due to magnetic field fluctuations can be reduced, making the arc intensity detected by the arc sensor lower than the actual one, which ultimately leads to the problem of delayed early warning.

[0032] S400, obtaining the magnitude of the constant magnetic current during the constant magnetic time, and calculating the warning current constant value according to the magnitude of the constant magnetic current and the constant breaking arc excessive value;

[0033] Specifically, the magnitude of the constant magnetic current during the constant magnetic time is recorded as ZA, and the rated current of the power distribution cabinet is recorded as MA, wherein the magnitude of the constant magnetic current during the constant magnetic time is the average current magnitude in the time interval Tz;

[0034] Further, the first-level warning current constant value ZX1 and the second-level warning current constant value ZX2 are calculated according to the constant magnetic current, wherein

[0035] Since traditional current monitoring methods rely on fixed current thresholds, they cannot effectively cope with current changes under different environments and operating conditions, which leads to current anomalies being ignored or not detected in a timely manner. Through dynamic calculation based on the constant magnetic current size ZA and the constant arc-breaking excess value ArcW, the system can adjust the warning current constant under different magnetic field operating conditions, thereby accurately detecting current anomalies and improving the sensitivity and accuracy of current monitoring.

[0036] S500 monitors the current and the measured values ​​of each arc sensor in real time, and compares them with the warning current set value and the constant arc breaking excessive value, and issues a warning signal based on the comparison result;

[0037] Among them, a warning signal is issued when the current of the distribution box is greater than the second-level warning current setting ZX2 or the measured value of the arc sensor is greater than the constant-break arc excessive value and the current of the distribution box is greater than the first-level warning current setting ZX1.

[0038] The beneficial effect of this step is: dynamic comparison reduces false alarms and missed alarms caused by environmental interference or instantaneous fluctuations by comparing with the predicted over-protection indicators (warning current constant and constant arc break excess value) under the current optimal magnetic field environment. This dynamic comparison can effectively filter out occasional, non-serious anomalies and improve the reliability and accuracy of the system.

[0039] The beneficial effects of the present invention are as follows: by comprehensively applying technologies such as constant magnetic time, calculation of the true value of arc intensity, dynamic warning current constant value adjustment and real-time data comparison, the accuracy and reliability of the arc monitoring system of the distribution box are significantly improved; the over-protection index can be dynamically adjusted under different magnetic field environment conditions, and false alarms caused by magnetic field interference and instantaneous fluctuations can be reduced, thereby ensuring timely and accurate detection of arc faults and improving the safety and stability of the power system.

[0040] The present invention also provides an arc light warning system for a power distribution cabinet, the arc light warning system for a power distribution cabinet comprising: a processor, a memory, and a computer program stored in the memory and executable on the processor, the processor implementing the steps in an arc light warning method for a power distribution cabinet when executing the computer program, the arc light warning system for a power distribution cabinet can be run in computing devices such as desktop computers, notebook computers, mobile phones, cell phones, tablet computers, PDAs, and cloud data centers, the executable systems may include, but are not limited to, processors, memories, and server clusters, the processor executing the computer program runs in the following system units:

[0041] The acquisition unit is used to obtain the magnetic field strength at the location of the arc sensor, and obtain the constant magnetic time according to the magnetic field strength at the location of the arc sensor;

[0042] The first calculation unit is used to obtain the arc intensity of the arc sensor under the constant magnetization time and calculate the real value of the arc intensity;

[0043] A detection unit, used to perform arc excessive detection according to the real value of arc intensity to obtain a constant average arc intensity, and calculate a constant-break arc excessive value according to the constant average arc intensity;

[0044] The second calculation unit is used to obtain the magnitude of the constant magnetic current during the constant magnetic time, and calculate the warning current constant value according to the magnitude of the constant magnetic current and the constant breaking arc excessive value;

[0045] The monitoring unit is used to monitor the current size and the measured values ​​of each arc sensor in real time, and compare them with the warning current set value and the constant-break arc excessive value, and issue a warning signal based on the comparison result.

[0046] The beneficial effects of the present invention are: the over-protection index can be dynamically adjusted under different magnetic field environment conditions, the false alarms caused by magnetic field interference and instantaneous fluctuations can be reduced, and the timely and accurate detection of arc faults can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The above and other features of the present invention will become more obvious by describing in detail the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings of the present invention represent the same or similar elements. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0048] Figure 1 Shown is a flow chart of an arc light early warning method for a power distribution cabinet;

[0049] Figure 2 Shown is a structural diagram of an arc light warning system for a power distribution cabinet. DETAILED DESCRIPTION

[0050] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other without conflict.

[0051] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0052] like Figure 1 The flowchart of the arc light warning method of a power distribution cabinet according to the present invention is shown below. Figure 1 A method for arc light warning in a power distribution cabinet according to an embodiment of the present invention will be described below.

[0053] The present invention provides an arc light early warning method for a power distribution cabinet, the method comprising the following steps:

[0054] S100, obtaining the magnetic field strength at the location of the arc sensor, and obtaining the constant magnetic time according to the magnetic field strength at the location of the arc sensor;

[0055] S200, obtaining the arc intensity of the arc sensor under the constant magnetization time, and calculating the real value of the arc intensity;

[0056] S300, performing arc excessive detection according to the real value of arc intensity to obtain a constant average arc intensity, and calculating a constant-off arc excessive value according to the constant average arc intensity;

[0057] S400, obtaining the magnitude of the constant magnetic current during the constant magnetic time and calculating the warning current constant value according to the magnitude of the constant magnetic current and the constant breaking arc excessive value;

[0058] S500 monitors the current size and the measured values ​​of each arc sensor in real time, and compares them with the warning current set value and the constant arc breaking excessive value, and issues a warning signal based on the comparison result.

[0059] Among them, the distribution cabinet arc light warning method is realized by the distribution cabinet arc light monitoring and warning device, which includes a distribution cabinet shell, a voltage and current transformer installed in the main incoming line circuit in the distribution cabinet shell, a current transformer installed in each branch circuit in the distribution cabinet shell, an arc sensor installed in the main incoming line circuit and each branch in the distribution cabinet shell, an intelligent fire extinguishing material integrated patch fire fighting module installed at different positions in the distribution cabinet shell, and a measurement and control unit chassis installed in the distribution cabinet shell. A computer hardware motherboard and a storage module, a designed embedded software analysis module, a hardware module analog interface and a switch interface are installed in the measurement and control unit chassis. The hardware module analog interface and the switch interface are respectively connected to the voltage and current transformer, the arc sensor, and the intelligent fire extinguishing material integrated patch fire fighting module through different data lines and receive their data. Then enter the software analysis module embedded in the measurement and control unit chassis. The software analysis module includes a CPU comprehensive analysis module, an early warning judgment module, a fire output module, and a remote background display operation module. The CPU comprehensive analysis module analyzes, calculates, and stores the sampled voltage, current, and arc light data, and then sends the calculated data to the early warning judgment module. The early warning judgment module determines whether the voltage, current, and arc light exceed the value. If they exceed the value, the early warning is activated and enters the fire output module. After the fire output module confirms, it enters the protection and starts the fire, and sends a control instruction through the computer. Then, it is connected through the switch channel to start the peripheral switch. The running alarm information and switch action status can be seen on the display screen of the remote background display operation module. The remote background display operation module is an operating keyboard and display, which is connected to the computer hardware motherboard in the measurement and control unit chassis.

[0060] Further, in step S100, the magnetic field strength at the location of the arc sensor is obtained, and the constant magnetic time is obtained according to the magnetic field strength at the location of the arc sensor;

[0061] Wherein, a Hall sensor is arranged on the arc sensor for measuring the magnetic field intensity at the location of the arc sensor.

[0062] Specifically, the average magnetic field strength of each arc sensor in each time interval T is obtained through the Hall sensor, and the average magnetic field strength is the average value of all instantaneous magnetic field strengths in units of seconds in the time interval, where the time interval T is set to [0.5, 5] seconds; Mag(Tj) is recorded as the total magnetic field strength received by all arc sensors in Tj, where Tj = [(j-1)*T, j*T], j = 1, 2, ..., H, H∈[5, 100]; the minimum value of each Mag(Tj) is obtained and recorded as Mag(Tz), and Tz is recorded as the constant magnetic time, z∈[1, H].

[0063] Because magnetic field interference will introduce additional electromagnetic noise, and it will be superimposed on the arc intensity signal, causing the signal noise to increase. This noise comes from the radiation of electromagnetic waves or electromagnetic interference sources, which will interfere with the normal operation of the sensor; and the increase in noise will reduce the signal-to-noise ratio of the signal, so that the real arc intensity signal is masked, increasing the risk of false alarms and missed alarms, and affecting the accuracy of fault detection. In addition, magnetic field interference may cause the sensitivity of the arc sensor to decrease, especially in a strong magnetic field environment, the internal electronic components of the sensor may be disturbed, thereby affecting its ability to respond to weak arc intensity signals. The reduction in sensor sensitivity will lead to a decrease in the detection ability of arc intensity signals and current values, and some weak arc intensity signals will be missed, resulting in the measured arc intensity being lower than the actual arc intensity, affecting the reliability of the overall monitoring system, and resulting in the inability to provide timely and safe warnings when the arc intensity exceeds the limit. In order to solve this problem, it is necessary to correct the detected arc intensity according to the magnetic field conditions of the distribution box, obtain the real arc intensity, the arc intensity that needs to be warned, and the current size that needs to be warned, and make accurate warnings.

[0064] In step S200, the process of obtaining the arc intensity of the arc sensor under the constant magnetization time and calculating the true value of the arc intensity includes:

[0065] The number of arc sensors is G, i represents the serial number of the arc sensor, Arc(Tz, i) represents the arc intensity value in the arc sensor with serial number i in the time period Tz, i = 1, 2, ..., G, the maximum arc intensity value of each arc sensor in all arc sensors in the time period Tz is obtained and recorded as ArcM, and the minimum arc intensity value is recorded as ArcU; the actual value of the arc intensity is

[0066] The constant magnetic time is found by the time interval of the minimum value of the average magnetic field strength. Obtaining the constant magnetic time can obtain the most accurate arc intensity data in the time period with the minimum magnetic field interference.

[0067] Further, in step S300, arc excessive detection is performed according to the real value of arc intensity to obtain constant average arc intensity, and the constant-off arc excessive value is calculated according to the constant average arc intensity, including:

[0068] S301, creating an arc excessive detection storage sequence.

[0069] Specifically, an integer variable x is initialized with an initial value of 1, and the range of x is [1, G]. Then, two zero-value variables ADA and ADB and two blank sequences FgA and FgB are created, where sequence FgB is an arc flash excessive detection storage sequence.

[0070] S302, performing arc excessive detection and analysis on the arc intensity during the constant magnetization time, and importing the analyzed arc intensity value into an arc excessive detection storage sequence.

[0071] Specifically, the value of ADA is calculated, which is equal to the result of subtracting Arc(Tz, i) from ARCP, and the value of ADB is calculated, which is equal to the result of subtracting ArcU from Arc(Tz, i). Subsequently, the values ​​of ADA and ADB are compared. If ADA is greater than ADB, the value of Arc(Tz, i) corresponding to the current variable x is added to the sequence FgA. If ADA is less than or equal to ADB, the value of Arc(Tz, i) corresponding to the current variable x is added to the sequence FgB.

[0072] S303, determine whether the arc excessive detection is completed, if completed, extract the sequence of the arc excessive detection storage sequence and jump to S304, if not completed, return to S302.

[0073] The method for judging whether the arc excessive detection is completed is as follows: check whether the value of the current variable x is less than M. If so, set x=x+1 and return to step S403. If the value of the current variable x is equal to M, create a blank array ARCV, import the elements of the sequence FgB into the array ARCV, and continue to step S405.

[0074] S304, averaging the data in the array ARCV to obtain a constant average arc intensity ArcK, and calculating the arc excess intensity Arcand, wherein the arc excess intensity Arcand = |ARCP-ArcK|, wherein || is an absolute value sign.

[0075] Among them, the constant average arc intensity ArcK is used to indicate the overall level of arc intensity during the constant magnetic time. The constant average arc intensity ArcK can reduce the impact of instantaneous noise and interference on the detection results and improve the stability and reliability of the detection by averaging the arc intensities screened out by the arc excessive detection. The arc excessive intensity Arcand is used to quantify the extent to which the arc intensity exceeds the normal range. By calculating the arc excessive intensity, the severity of the arc excessive intensity can be judged more accurately.

[0076] S305, calculating the constant-break arc excess value according to the arc excess intensity; wherein the constant-break arc excess value ArcW = ArcM-Arcand;

[0077] Among them, the constant-off arc excess value ArcW is used to comprehensively evaluate the excessive arc intensity and is a key indicator for triggering early warning or taking safety measures. By subtracting the maximum arc intensity from the excess intensity to fit the judgment indicator of excessive arc intensity under unstable magnetic field, the noise generated by harmonic deformation due to magnetic field fluctuations can be reduced, making the arc intensity detected by the arc sensor lower than the actual one, which ultimately leads to the problem of delayed early warning.

[0078] S400, obtaining the magnitude of the constant magnetic current during the constant magnetic time, and calculating the warning current constant value according to the magnitude of the constant magnetic current and the constant breaking arc excessive value;

[0079] Specifically, the magnitude of the constant magnetic current during the constant magnetic time is recorded as ZA, and the rated current of the power distribution cabinet is recorded as MA, wherein the magnitude of the constant magnetic current during the constant magnetic time is the average current magnitude in the time interval Tz;

[0080] Further, the first-level warning current constant value ZX1 and the second-level warning current constant value ZX2 are calculated according to the constant magnetic current, wherein

[0081] Since traditional current monitoring methods rely on fixed current thresholds, they cannot effectively cope with current changes under different environments and operating conditions, which leads to current anomalies being ignored or not detected in a timely manner. Through dynamic calculation based on the constant magnetic current size ZA and the constant arc-breaking excess value ArcW, the system can adjust the warning current constant under different magnetic field operating conditions, thereby accurately detecting current anomalies and improving the sensitivity and accuracy of current monitoring.

[0082] S500 monitors the current and the measured values ​​of each arc sensor in real time, and compares them with the warning current set value and the constant arc breaking excessive value, and issues a warning signal based on the comparison result;

[0083] Among them, a warning signal is issued when the current of the distribution box is greater than the second-level warning current setting ZX2 or the measured value of the arc sensor is greater than the constant-break arc excessive value and the current of the distribution box is greater than the first-level warning current setting ZX1.

[0084] The arc light warning system for distribution cabinets includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned arc light warning method embodiment for distribution cabinets are implemented. The arc light warning system for distribution cabinets can be run on computing devices such as desktop computers, laptop computers, mobile phones, cell phones, tablet computers, PDAs, and cloud data centers. The executable systems may include, but are not limited to, processors, memories, and server clusters.

[0085] An embodiment of the present invention provides an arc warning system for a power distribution cabinet, such as Figure 2 As shown, an arc light warning system for a power distribution cabinet of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned embodiment of an arc light warning method for a power distribution cabinet are implemented. The processor executes the computer program to run in the following system units:

[0086] The acquisition unit is used to obtain the magnetic field strength at the location of the arc sensor, and obtain the constant magnetic time according to the magnetic field strength at the location of the arc sensor;

[0087] The first calculation unit is used to obtain the arc intensity of the arc sensor under the constant magnetization time and calculate the real value of the arc intensity;

[0088] A detection unit, used to perform arc excessive detection according to the real value of arc intensity to obtain a constant average arc intensity, and calculate a constant-break arc excessive value according to the constant average arc intensity;

[0089] The second calculation unit is used to obtain the magnitude of the constant magnetic current during the constant magnetic time, and calculate the warning current constant value according to the magnitude of the constant magnetic current and the constant breaking arc excessive value;

[0090] The monitoring unit is used to monitor the current size and the measured values ​​of each arc sensor in real time, and compare them with the warning current set value and the constant-break arc excessive value, and issue a warning signal based on the comparison result.

[0091] The arc light warning system for a distribution cabinet can be run in computing devices such as desktop computers, laptop computers, PDAs, and cloud data centers. The arc light warning system for a distribution cabinet includes, but is not limited to, a processor and a memory. Those skilled in the art can understand that the example is only an example of an arc light warning method and system for a distribution cabinet, and does not constitute a limitation on an arc light warning method and system for a distribution cabinet. It may include more or fewer components than the example, or a combination of certain components, or different components. For example, the arc light warning system for a distribution cabinet may also include input and output devices, network access devices, buses, etc.

[0092] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete component gate circuits or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the arc warning system of the distribution cabinet, and uses various interfaces and lines to connect the various sub-areas of the arc warning system of the distribution cabinet.

[0093] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the distribution cabinet arc warning method and system by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SmartMediaCard, SMC), a secure digital (SecureDigital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0094] Although the description of the present invention has been quite detailed and has been described in particular with respect to several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, so as to effectively cover the intended scope of the present invention. In addition, the present invention is described above with the embodiments foreseeable by the inventors, and its purpose is to provide a useful description, and those non-substantial changes to the present invention that are not currently foreseen may still represent equivalent changes of the present invention.

Claims

1. A distribution cabinet arc light early warning method, characterized in that: The method comprises the following steps: S100, obtaining the magnetic field strength at the location of the arc sensor, and obtaining the constant magnetic time according to the magnetic field strength at the location of the arc sensor; wherein obtaining the constant magnetic time includes: a Hall sensor is provided on the arc sensor to measure the magnetic field strength at the location of the arc sensor, and the average magnetic field size of each arc sensor in each time interval T is obtained through the Hall sensor, the average magnetic field strength size is the average value of all instantaneous magnetic field strengths in units of seconds in the time interval, wherein the time interval T is set to [0.5, 5] seconds; Mag(Tj) is recorded as the total magnetic field strength size received by all arc sensors in Tj, wherein Tj=[(j-1)*T, j*T], j=1, 2, ..., H, H∈[5, 100]; obtaining the minimum value of each Mag(Tj) is recorded as Mag(Tz), and Tz is recorded as the constant magnetic time, z∈[1, H]; S200, obtaining the arc intensity of the arc sensor under the constant magnetization time, and calculating the real value of the arc intensity; wherein, the method for calculating the real value of the arc intensity includes: obtaining the number of arc sensors as G, i represents the serial number of the arc sensor, Arc(Tz, i) represents the arc intensity value in the arc sensor with serial number i in the time period Tz, i=1, 2, ..., G, obtaining the maximum arc intensity value of each arc sensor in all arc sensors in the time period Tz as ArcM, and recording the minimum arc intensity value as ArcU; wherein the real value of the arc intensity is recorded as ARCP, wherein the calculation method of ARCP is: ； S300, performing arc excessive detection according to the real value of arc intensity to obtain a constant average arc intensity, and calculating a constant-off arc excessive value according to the constant average arc intensity; S400, obtaining the magnitude of the constant magnetic current during the constant magnetic time, and calculating the warning current constant value according to the magnitude of the constant magnetic current and the constant breaking arc excessive value; S500 monitors the current size and the measured values ​​of each arc sensor in real time, and compares them with the warning current set value and the constant arc breaking excessive value, and issues a warning signal based on the comparison result.

2. The arc light warning method for a power distribution cabinet according to claim 1 is characterized in that: In step S300, the arc excessive detection is performed according to the real value of the arc intensity to obtain the constant average arc intensity, and the step of calculating the constant-off arc excessive value according to the constant average arc intensity includes: S301, creating an arc excessive detection storage sequence; S302, performing arc excessive detection and analysis on the arc intensity during the constant magnetization time, and importing the analyzed arc intensity value into an arc excessive detection storage sequence; S303, determining whether the arc excessive detection is completed, if completed, extracting the sequence of the arc excessive detection storage sequence and jumping to S304, if not completed, returning to S302; S304, averaging each data in the array ARCV to obtain a constant average arc intensity ArcK, and calculating an arc excess intensity Arcand, wherein the arc excess intensity Arcand=|ARCP-ArcK|, wherein || is an absolute value symbol; S305, calculating the constant-break arc excess value according to the arc excess intensity; wherein the constant-break arc excess value ArcW=ArcM-Arcand.

3. The arc light warning method for a power distribution cabinet according to claim 2 is characterized in that: In S400, obtaining the magnitude of the constant magnet current during the constant magnet time and calculating the warning current constant value according to the magnitude of the constant magnet current and the constant breaking arc excessive value includes: The magnitude of the constant magnetic current during the constant magnetic time is recorded as ZA, and the rated current of the power distribution cabinet is recorded as MA, wherein the magnitude of the constant magnetic current during the constant magnetic time is the average current magnitude in the time interval Tz; The first-level warning current constant value ZX1 and the second-level warning current constant value ZX2 are calculated based on the constant magnetic current. ; .

4. The arc light warning method for a power distribution cabinet according to claim 3 is characterized in that: In S500, the current magnitude and the measured values ​​of each arc sensor are monitored in real time, and compared with the warning current constant value and the constant arc breaking excessive value. The method of issuing a warning signal according to the comparison result is as follows: When the current of the distribution box is greater than the second-level warning current setting ZX2 or the measured value of the arc sensor is greater than the constant-break arc excessive value and the current of the distribution box is greater than the first-level warning current setting ZX1, a warning signal is issued.

5. An arc light warning system for a power distribution cabinet, characterized in that: The arc light warning system for a distribution cabinet comprises: a processor, a memory, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of the arc light warning method for a distribution cabinet described in any one of claims 1 to 4 are implemented. The arc light warning system for a distribution cabinet runs on a desktop computer, a laptop computer, a PDA, or a computing device in a cloud data center.

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