A method and system for monitoring the power consumption safety of a power distribution cabinet

Abstract

The present application relates to the technical field of power distribution equipment, and discloses a method and system for monitoring the power consumption safety of a power distribution cabinet. The method includes creating a thermal simulation model in a thermal simulation program based on a circuit design document; collecting the power consumption parameters of each power consumption unit and generating a current-time curve and a wire temperature-time curve in combination with the sampling time; determining current inflection points from the current-time curve, calculating the fitting slope of the branch supply current during the fluctuation analysis period after the current inflection point and comparing it with a set of qualified slope intervals; defining the current inflection points that do not conform to the set of qualified slope intervals as abnormal inflection points, and obtaining the measured values of the temperature change during the temperature analysis period after the abnormal inflection point; obtaining the current change curve segment during the temperature analysis period after the abnormal inflection point and inputting it into the thermal simulation model to evaluate the theoretical value of the temperature change. When the deviation rate of the measured value of the temperature change exceeds the deviation interval, a safety disposal instruction is generated. The present application has the effect of improving the reliability of the power consumption safety monitoring judgment standard.

Description

Technical Field

[0001] The present application relates to the technical field of power distribution equipment, and in particular, to a method and system for monitoring the power consumption safety of a power distribution cabinet. Background Art

[0002] Power distribution cabinets are usually used to monitor the power consumption of each power-consuming unit associated in a specific area or a power-consuming group composed of multiple power-consuming units, and can control the power consumption status of the associated power-consuming units or power-consuming groups, such as power-off, power-limiting, etc.; some power distribution cabinets have the function of monitoring power consumption safety, and can also cut off the power supply when a power consumption safety hazard is detected in a power-consuming unit or power-consuming group. However, the existing power consumption safety monitoring of power distribution cabinets usually determines whether there are safety hazards in power-consuming units or power-consuming groups based on whether the current exceeds a specific threshold, or whether there is leakage or abnormal temperature. The above-mentioned related technologies have the problem of insufficient reliability of the power consumption safety monitoring judgment criteria. Summary of the Invention

[0003] In order to improve the reliability of the power consumption safety monitoring judgment criteria, the present application provides a method and system for monitoring the power consumption safety of a power distribution cabinet.

[0004] The first invention object of the present application is achieved by adopting the following technical solutions:

[0005] A method for monitoring the power consumption safety of a power distribution cabinet includes:

[0006] Based on the circuit design file of the area to be monitored, create a thermal simulation model of the area to be monitored in a thermal simulation program;

[0007] Collect the power consumption parameters of each power-consuming unit based on a preset sampling frequency, so as to fit and generate corresponding current-time curves and line temperature-time curves according to the power consumption parameters and sampling time;

[0008] Determine the current inflection points one by one from the current-time curve, calculate the fitting slope of the branch supply current within a fluctuation analysis period after the current inflection point, and compare it with a preset qualified slope interval group;

[0009] Define the current inflection points whose fitting slopes do not conform to the qualified slope interval group as abnormal inflection points, and obtain the measured temperature change values within a temperature analysis period after the abnormal inflection point based on the line temperature-time curve;

[0010] Obtain the current change curve segment within a temperature analysis period after the abnormal inflection point from the current-time curve and input it into the thermal simulation model to evaluate the theoretical temperature change value. When the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds a preset deviation interval, generate a safety disposal instruction to control the power supply status of the corresponding branch;

[0011] The circuit design document records the size information, location information, heat generation performance information, and heat dissipation performance information corresponding to each cable; the electrical parameters include the branch supply current and the branch cable temperature; the current inflection point refers to the current change time node in the current curve where the absolute value of the current change value is greater than a preset current change threshold; the current change curve segment refers to the curve intercepted from the current-time curve.

[0012] By adopting the above technical solution, a thermal simulation model is created according to the circuit design document of the area to be monitored, so as to subsequently evaluate the heat generation and heat dissipation of the cable based on the magnitude and time of the current passing through the cable, and then calculate the theoretical value of the cable temperature change; the electrical parameters of each power consumption unit are collected based on a preset sampling frequency, including the branch supply current and the branch cable temperature, so as to generate the current-time curve and the line temperature-time curve of each power consumption unit, which is convenient for subsequent analysis of potential electrical safety hazards according to the characteristics of the electrical parameters of each power consumption unit; the current inflection points are determined one by one from the current-time curve, and the fitting slope of the branch supply current within a fluctuation analysis period after the current inflection point is calculated and compared with the qualified slope interval group, so as to judge whether the fitting slope of the current inflection point is normal; the current inflection points that do not conform to the qualified slope interval group are defined as abnormal inflection points, and the measured temperature change value within a temperature analysis period after the abnormal inflection point is obtained based on the line temperature-time curve, so as to know the temperature change situation of the branch cable after the abnormal inflection point; the current change curve segment within a temperature analysis period after the abnormal inflection point is obtained from the current-time curve and input into the thermal simulation model, so as to evaluate the theoretical value of the temperature change calculated according to the current change of the branch cable after the abnormal inflection point. When the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds the deviation interval, it is considered that there is a potential electrical safety hazard in this power consumption unit, and a safety disposal instruction is generated to control the power supply state of the corresponding branch, improving the reliability of the electrical safety monitoring and judgment standard.

[0013] In a preferred example of the present application: based on the circuit design document of the area to be monitored, a thermal simulation model of the area to be monitored is created in the thermal simulation program, including:

[0014] Obtain the circuit design document of the area to be monitored, and create a circuit model based on the size information and location information of each cable in the circuit of the area to be monitored;

[0015] Import the circuit model into the thermodynamic simulation program, obtain the heat generation performance information and heat dissipation performance information of each cable from the circuit design document and mark them in the circuit model to generate a thermal simulation model.

[0016] By adopting the above technical solution, according to the circuit design document of the area to be monitored, determine the size information and position information of each cable in the circuit of the area to be monitored, so as to create a circuit model; import the circuit model into a thermodynamic simulation program, obtain the heat generation performance information and heat dissipation performance information of each cable from the circuit design document and mark them in the circuit model, so as to generate a thermal simulation model with the function of simulating the heat generation and heat dissipation of the circuit in the area to be monitored.

[0017] In a preferred example of the present application: The step of successively determining current inflection points from the current-time curve, calculating the fitting slope of the branch supply current within a fluctuation analysis period after the current inflection point and comparing it with a preset group of qualified slope intervals includes:

[0018] Successively determine current inflection points from the current-time curve, and obtain the current change curve segment within a fluctuation analysis period after the current inflection point;

[0019] Obtain the maximum current difference from the current change curve segment, and calculate the quotient of the maximum current difference and the fluctuation analysis period to obtain the fitting slope;

[0020] Compare the fitting slope with the group of qualified slope intervals;

[0021] The group of qualified slope intervals includes one or more qualified slope intervals; the qualified slope intervals included in the group of qualified slope intervals cover the current change characteristics of the known variable current working appliances equipped in the corresponding power consumption unit. [[ID=...]]

[0022] By adopting the above technical solution, successively determine current inflection points from the current-time curve, intercept the current change curve segment within a fluctuation analysis period after the current inflection point, so as to analyze the change of the branch supply current of the power consumption unit after the current inflection point; obtain the maximum current difference from the current-time curve segment, and then calculate the fitting slope according to the quotient of the maximum current difference and the fluctuation analysis period; compare the fitting slope with the group of qualified slope intervals. Since the power / current of the electrical appliance usually changes rapidly when the user normally turns on, turns off the electrical appliance or adjusts the working gear of the electrical appliance, it will cause a cliff-like increase or decrease in the current-time curve of the branch supply current. If the current-time curve of the power consumption unit has a non-cliff-like change in current and this change trend does not belong to the known variable current working appliances equipped in the power consumption unit, it is judged that there may be an abnormal situation of the electrical appliance in the power consumption unit.

[0023] In a preferred example of the present application: The step of obtaining the current change curve segment within a temperature analysis period after the abnormal inflection point from the current-time curve and inputting it into the thermal simulation model to evaluate the theoretical value of temperature change, and generating a safety disposal instruction to control the power supply state of the corresponding branch when the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds the preset deviation interval includes:

[0024] Intercept the current change curve segment within one temperature analysis period after the abnormal inflection point based on the current-time curve and input it into the thermal simulation model to calculate the theoretical value of the temperature change generated when the heat generated by the circuit in the area to be monitored under the action of the current is conducted to the branch cable;

[0025] Obtain the measured value of the temperature change measured by the branch cable, and calculate the quotient of the measured value of the temperature change and the theoretical value of the temperature change to obtain the deviation rate;

[0026] When the deviation rate exceeds the preset deviation range, generate a safety disposal instruction to control the power supply state of the corresponding branch, and at the same time generate a safety alarm message and send it to the user terminal.

[0027] By adopting the above technical solution, based on the current-time curve, intercept the current change curve segment within one temperature analysis period after the abnormal inflection point and input it into the thermal simulation model to evaluate the heat generation of the circuit in the area to be monitored caused by the magnitude and change of the current during this period, as well as the heat dissipation of the circuit in the monitoring area during this period, and the heat conduction situation, and then calculate the theoretical value of the temperature change generated at the branch cable when the heat is conducted to the branch cable; obtain the measured value of the temperature change measured by the branch cable to calculate the deviation rate according to the quotient of the measured value of the temperature change and the theoretical value of the temperature change, so as to know the difference between the actual temperature change situation and the theoretical temperature change situation on the branch cable; when the deviation rate exceeds the deviation range, it is considered that the deviation of the measured value of the temperature change relative to the theoretical value of the temperature change is too large, generate a safety disposal instruction to control the power supply state of the corresponding branch to prevent potential hidden dangers of electricity use safety, generate a safety alarm message and send it to the user terminal to prompt the user to be vigilant against possible safety accidents and eliminate safety hazards in time.

[0028] In a preferred example of the present application: before comparing the fitting slope with the qualified slope interval group, it includes:

[0029] Based on the current-time curve, determine the measured current corresponding to the current inflection point, and set a basic slope interval group based on the measured current and the basic slope interval setting formula;

[0030] Obtain the variable current slope interval corresponding to the fitting slope when the known variable current working electrical appliance is working with variable current, and add the variable current slope interval to the basic slope interval group to generate a qualified slope interval group;

[0031] Among them, the basic slope interval setting formula is:

[0032]

[0033] Among them, a is the first basic angle, β is the second basic angle, I0 is the branch cable simulated current, I Zis the measured current, c is the current adjustment coefficient, and d is the upper limit value of the simulated current.

[0034] By adopting the above technical solution, based on the current-time curve, the measured current corresponding to the current inflection point is determined, and the basic slope interval is set according to the basic slope interval setting formula, where the numerical range of the basic slope interval is negatively correlated with the branch supply current within a certain range, so as to adapt to the dilution effect reflected on the current-time curve when a large number of electrical appliances in the power consumption unit are used simultaneously; the variable current slope interval corresponding to the known variable current working electrical appliance during variable current operation is obtained, and the numerical range of the variable current slope interval is increased from the basic slope interval group to generate a qualified slope interval group, so as to cover the current change characteristics of the known variable current working electrical appliances equipped in the corresponding power consumption unit and reduce the possibility of misjudging abnormal inflection points.

[0035] The second invention object of the present application is realized by adopting the following technical solution:

[0036] An electrical safety monitoring system for a power distribution cabinet, which is applied to the electrical safety monitoring method for the power distribution cabinet described in any one of the above, includes:

[0037] A thermal simulation model creation module, which is used to create a thermal simulation model of the area to be monitored in a thermal simulation program based on the circuit design file of the area to be monitored;

[0038] A parameter-time curve generation module, which is used to collect the electrical parameters of each power consumption unit based on a preset sampling frequency, so as to fit and generate corresponding current-time curves and line temperature-time curves according to the electrical parameters and sampling time;

[0039] A fitting slope comparison module, which is used to determine the current inflection points one by one from the current-time curve, calculate the fitting slope of the branch supply current within a fluctuation analysis period after the current inflection point, and compare it with the preset qualified slope interval group;

[0040] A temperature change measurement module, which is used to define the current inflection point with a fitting slope that does not conform to the qualified slope interval group as an abnormal inflection point, and obtain the measured value of the temperature change within a temperature analysis period after the abnormal inflection point based on the line temperature-time curve;

[0041] A safety disposal instruction generation module, which is used to obtain the current change curve segment within a temperature analysis period after the abnormal inflection point from the current-time curve and input it into the thermal simulation model to evaluate the theoretical value of the temperature change. When the deviation rate of the measured value of the temperature change relative to the theoretical value of the temperature change exceeds the preset deviation interval, a safety disposal instruction is generated to control the power supply state of the corresponding branch line;

[0042] The circuit design document records the size information, location information, heat generation performance information, and heat dissipation performance information corresponding to each cable; the electrical parameters include the branch supply current and the branch cable temperature; the current inflection point refers to the current change time node in the current curve where the absolute value of the current change value is greater than a preset current change threshold; the current change curve segment refers to the curve intercepted from the current-time curve.

[0043] In a preferred example of the present application: The thermal simulation model creation module includes:

[0044] A circuit model creation sub-module, configured to obtain the circuit design document of the area to be monitored, and create a circuit model based on the size information and location information of each cable in the circuit of the area to be monitored;

[0045] A thermal performance loading sub-module, configured to import the circuit model into a thermodynamic simulation program, obtain the heat generation performance information and heat dissipation performance information of each cable from the circuit design document, and mark them in the circuit model to generate a thermal simulation model.

[0046] In a preferred example of the present application: The fitting slope comparison module includes:

[0047] A current change curve segment intercepting sub-module, configured to determine the current inflection points one by one from the current-time curve, and obtain the current change curve segment within a fluctuation analysis period after the current inflection point;

[0048] A fitting slope calculation sub-module, configured to obtain the maximum current difference from the current change curve segment, and calculate the quotient of the maximum current difference and the fluctuation analysis period to obtain the fitting slope;

[0049] A slope qualification evaluation sub-module, configured to compare the fitting slope with a group of qualified slope intervals.

[0050] The group of qualified slope intervals includes one or more qualified slope intervals; the qualified slope intervals included in the group of qualified slope intervals cover the current change characteristics of the known variable current working electrical appliances equipped in the corresponding power consumption unit.

[0051] The third object of the invention of the present application is achieved by the following technical solutions:

[0052] A computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where when the processor executes the computer program, the steps of the above-mentioned power distribution cabinet power consumption safety monitoring method are implemented.

[0053] The fourth object of the invention of the present application is achieved by the following technical solutions:

[0054] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned power consumption safety monitoring method for the power distribution cabinet are realized.

[0055] In summary, the present application includes at least one of the following beneficial technical effects:

[0056] 1. Create a thermal simulation model according to the circuit design file of the area to be monitored, so as to subsequently evaluate the heat generation and heat dissipation of the cable based on the magnitude and time of the current passing through the cable, and then calculate the theoretical value of the cable temperature change; collect the power consumption parameters of each power consumption unit based on a preset sampling frequency, including the branch supply current and the branch cable temperature, so as to generate the current-time curve and the line temperature-time curve of each power consumption unit, which is convenient for subsequent analysis of power consumption safety hazards according to the power consumption parameter characteristics of each power consumption unit; determine the current inflection points one by one from the current-time curve, calculate the fitting slope of the branch supply current within a fluctuation analysis period after the current inflection point and compare it with the qualified slope interval group, so as to judge whether the fitting slope of the current inflection point is normal; define the current inflection points that do not conform to the qualified slope interval group as abnormal inflection points, and obtain the measured value of the temperature change within a temperature analysis period after the abnormal inflection point based on the line temperature-time curve, so as to know the temperature change of the branch cable after the abnormal inflection point; obtain the current change curve segment within a temperature analysis period after the abnormal inflection point from the current-time curve and input it into the thermal simulation model, so as to evaluate the theoretical value of the temperature change calculated according to the current change of the branch cable after the abnormal inflection point. When the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds the deviation interval, it is considered that there is a power consumption safety hazard in this power consumption unit, and a safety disposal instruction is generated to control the power supply state of the corresponding branch, which improves the reliability of the power consumption safety monitoring judgment standard.

[0057] 2. According to the circuit design file of the area to be monitored, determine the size information and position information of each cable constituting the circuit in the area to be monitored, so as to create a circuit model; import the circuit model into the thermodynamic simulation program, and obtain the heat generation performance information and heat dissipation performance information of each cable from the circuit design file and mark them in the circuit model, so as to generate a thermal simulation model with the function of simulating the heat generation and heat dissipation of the circuit in the area to be monitored.

[0058] 3. Determine the current inflection points one by one from the current-time curve, and intercept the current change curve segment in a fluctuation analysis period after the current inflection point, so as to analyze the change of the branch supply current of the electricity-consuming unit after the current inflection point; obtain the maximum current difference from the current-time curve segment, and then calculate the fitting slope according to the quotient of the maximum current difference and the fluctuation analysis period; compare the fitting slope with the qualified slope interval group. Since the power / current of the electrical appliance usually changes rapidly when the user normally turns on, turns off the electrical appliance or adjusts the working gear of the electrical appliance, it will cause a cliff-like increase or decrease in the current-time curve of the branch supply current. If the current-time curve of the electricity-consuming unit has a non-cliff-like change in current and this change trend does not belong to the known current-changing working electrical appliances equipped by the electricity-consuming unit, it is judged that there may be an abnormal situation of the electrical appliance in the electricity-consuming unit. Description of the Drawings

[0059] Figure 1 is a flowchart of the power consumption safety monitoring method for the power distribution cabinet in the first embodiment of the present application.

[0060] Figure 2 is a schematic block diagram of the power consumption safety monitoring system for the power distribution cabinet in the second embodiment of the present application.

[0061] Figure 3 is a schematic diagram of the equipment in the third embodiment of the present application. Detailed Embodiments

[0062] The following is a further detailed description of the present application in conjunction with the attached Figures 1 to 3 drawings.

[0063] Embodiment 1

[0064] Refer to Figure 1 , the present application discloses a power consumption safety monitoring method for a power distribution cabinet, which specifically includes the following steps:

[0065] S10: Based on the circuit design file of the area to be monitored, create a thermal simulation model of the area to be monitored in the thermal simulation program.

[0066] In this embodiment, the circuit design file records the size information, deployment location information, cable model information, heat generation performance information, and heat dissipation performance information corresponding to each cable. Among them, the heat generation performance information and heat dissipation performance information can be specifically determined according to the cable model, or can be obtained through a large number of experimental tests; the heat generation performance information and heat dissipation performance information refer to the heat generation and heat dissipation performance information determined by combining the thermal performance of the cable surface wrapping structure; the area to be monitored refers to the area that needs to be monitored by the power distribution cabinet.

[0067] Specifically, a thermal simulation model is created in a thermal simulation program according to the circuit design file of the area to be monitored, so as to subsequently evaluate the heat generation and heat dissipation of the cable based on the magnitude and time of the current passing through the cable, and then calculate the theoretical value of the cable temperature change; the thermal simulation program can be FloEFD, Flotherm, SolidWorks Simulation, Flowmaster, ANSYS, etc.

[0068] Among them, in step S10, it includes:

[0069] S11: Obtain the circuit design file of the area to be monitored, and create a circuit model based on the size information and position information of each cable in the circuit of the area to be monitored.

[0070] Specifically, according to the circuit design file of the area to be monitored, determine the size information and position information of all cables constituting the circuit in the area to be monitored, so as to create a circuit model.

[0071] S12: Import the circuit model into the thermodynamic simulation program, obtain the heat generation performance information and heat dissipation performance information of each cable from the circuit design file, and mark them on the circuit model to generate a thermal simulation model.

[0072] Specifically, import the circuit model into the thermodynamic simulation program, obtain the heat generation performance information and heat dissipation performance information of each cable from the circuit design file, and mark them on the circuit model, so as to generate a thermal simulation model with the function of simulating the heat generation and heat dissipation of the circuit in the area to be monitored.

[0073] S20: Collect the power consumption parameters of each power consumption unit based on a preset sampling frequency, so as to fit and generate corresponding current-time curves and line temperature-time curves according to the power consumption parameters and sampling time.

[0074] In this embodiment, each power consumption unit is powered by a branch cable, and the power distribution cabinet is connected to the branch cables corresponding to each power consumption unit; the power consumption parameters include the branch supply current and the branch cable temperature. The branch supply current refers to the current supplied by the branch cable; the branch cable temperature refers to the temperature measured at the branch cable; preferably, the sampling frequency is 25Hz, and the sampling frequency can be set to the alternating current frequency supplied according to actual needs, or other frequencies that can be divided evenly by the alternating current frequency; the currents mentioned in this embodiment are all equivalent currents.

[0075] Specifically, collect the power consumption parameters of each power consumption unit based on a preset sampling frequency, including the branch supply current and the branch cable temperature, so as to generate the current-time curves and line temperature-time curves of each power consumption unit, which is convenient for subsequent analysis of potential power consumption safety hazards according to the power consumption parameter characteristics of each power consumption unit.

[0076] S30: Determine the current inflection points one by one from the current-time curve, calculate the fitting slope of the branch supply current within one fluctuation analysis period after the current inflection point, and compare it with the preset qualified slope interval group.

[0077] In this embodiment, the current inflection point refers to the current change time node at which the direction of change of the current value in the current curve changes and the absolute value of the current change value per unit time is greater than the preset current change threshold, so as to reduce the possibility that small fluctuations in the current are misdetected as abnormal electricity consumption; the fluctuation analysis period refers to the period set for analyzing the current fluctuation situation. Preferably, the fluctuation analysis period is 0.2S; the fitting slope refers to the quotient of the maximum difference in the branch supply current within the fluctuation analysis period and the duration of the fluctuation analysis period; the qualified slope interval group refers to the interval group set for judging whether the fitting slope is normal.

[0078] Specifically, determine the current inflection points one by one from the current-time curve, calculate the fitting slope of the branch supply current within one fluctuation analysis period after the current inflection point, and compare it with the qualified slope interval group to determine whether the fitting slope of the current inflection point is normal.

[0079] Among them, in step S30, it includes:

[0080] S31: Determine the current inflection points one by one from the current-time curve, and obtain the current change curve segment within one fluctuation analysis period after the current inflection point.

[0081] Specifically, determine the current inflection points one by one from the current-time curve, and intercept the current change curve segment within one fluctuation analysis period after the current inflection point to analyze the change situation of the branch supply current of the electricity-consuming unit after the current inflection point.

[0082] S32: Obtain the maximum current difference from the current change curve segment, and calculate the quotient of the maximum current difference and the fluctuation analysis period to obtain the fitting slope.

[0083] Specifically, obtain the maximum current difference from the current-time curve segment, and then calculate the fitting slope according to the quotient of the maximum current difference and the fluctuation analysis period.

[0084] S33: Compare the fitting slope with the qualified slope interval group.

[0085] In this embodiment, the qualified slope interval group includes one or more qualified slope intervals; the qualified slope intervals included in the qualified slope interval group cover the current change characteristics of the known current conversion working appliances equipped with the corresponding electricity-consuming units.

[0086] Specifically, compare the fitting slope with the qualified slope interval group. Since the power / current of the electrical appliance usually changes rapidly when the user normally turns on, turns off the electrical appliance or adjusts the working gear of the electrical appliance, it will cause a cliff-like increase or decrease in the current-time curve of the branch supply current. If there is a non-cliff-like change in the current-time curve of the electricity consumption unit, and this change trend does not belong to the known variable-current working electrical appliances equipped in the electricity consumption unit, such as variable-frequency air conditioners, it is determined that there may be an abnormal situation of the electrical appliance in the electricity consumption unit.

[0087] Among them, before step S30, it further includes:

[0088] S34: Based on the current-time curve, determine the measured current corresponding to the current inflection point, and set the basic slope interval group based on the measured current and the basic slope interval setting formula.

[0089] In this embodiment, the measured current refers to the measured value of the branch supply current;

[0090] Among them, the basic slope interval setting formula is:

[0091]

[0092] Among them, α is the first basic angle, β is the second basic angle, I0 is the branch-fictitious current, I Z is the measured current, c is the current adjustment coefficient, and d is the upper limit value of the fictitious current; preferably, the current adjustment coefficient and the upper limit value of the fictitious current can be determined or adjusted according to the rated current-carrying capacity of the branch cable. For example, when the branch cable is 1.5 square millimeter copper wire or 2.5 square millimeter aluminum wire, the current adjustment coefficient is set to 3, and the upper limit value of the fictitious current is set to 15; preferably, the first basic angle is taken as 10°, and the second basic angle is taken as 80°.

[0093] Specifically, based on the current-time curve, determine the measured current corresponding to the current inflection point, and set the basic slope interval according to the basic slope interval setting formula, where the numerical range of the basic slope interval is negatively correlated with the branch supply current within a certain range, so as to adapt to the dilution effect reflected in the current-time curve when a large number of electrical appliances in the electricity consumption unit are used simultaneously.

[0094] S35: Obtain the variable-current slope interval corresponding to the fitting slope when the known variable-current working electrical appliance is in variable-current operation, and add the variable-current slope interval to the basic slope interval group to generate the qualified slope interval group.

[0095] Specifically, analyze the normal operating current change characteristics of the known converter working electrical appliances equipped by the target unit from the description documents of the known converter working electrical appliances or the experimental data obtained through experiments, determine the converter slope interval corresponding to the known converter working electrical appliances during the converter operation, and increase the numerical range of the converter slope interval from the basic slope interval group to generate a qualified slope interval group, so as to cover the current change characteristics of the known converter working electrical appliances equipped by the corresponding power consumption unit and reduce the possibility of misjudging abnormal inflection points; the number of converter slope intervals can be one or more.

[0096] S40: Define the current inflection point whose fitting slope does not conform to the qualified slope interval group as an abnormal inflection point, and obtain the measured temperature change value within one temperature analysis period after the abnormal inflection point based on the line temperature-time curve.

[0097] In this embodiment, the temperature analysis period refers to the period set for analyzing the temperature change situation. Preferably, the temperature analysis period is 2S; the measured temperature change value is the actual temperature change value measured at the branch cable.

[0098] Specifically, define the current inflection point that does not conform to the qualified slope interval group as an abnormal inflection point, and obtain the measured temperature change value within one temperature analysis period after the abnormal inflection point from the line temperature-time curve, so as to know the temperature change situation of the branch cable after the abnormal inflection point.

[0099] Further, when an abnormal inflection point is detected, generate power consumption abnormal troubleshooting information and send it to the power consumption terminal, so that the user can troubleshoot the possible power consumption abnormal situation by himself; the power consumption terminal refers to the intelligent terminal device used by the user, such as a smart phone.

[0100] S50: Obtain the current change curve segment within one temperature analysis period after the abnormal inflection point from the current-time curve and input it into the thermal simulation model to evaluate the theoretical temperature change value. When the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds the preset deviation interval, generate a safety disposal instruction to control the power supply state of the corresponding branch line.

[0101] In this embodiment, the current change curve segment refers to the curve intercepted from the current-time curve; preferably, the deviation interval can be set to [-10%, +20%].

[0102] Specifically, obtain the current change curve segment within one temperature analysis period after the abnormal inflection point from the current-time curve and input it into the thermal simulation model, so as to evaluate the theoretical temperature change value calculated according to the current change of the branch cable after the abnormal inflection point. When the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds the deviation interval, it is considered that there is a power consumption safety hazard in the power consumption unit, and a safety disposal instruction is generated to control the power supply state of the corresponding branch line, which improves the reliability of the power consumption safety monitoring judgment standard.

[0103] Among them, in step S50, it includes:

[0104] S51: Based on the current-time curve, intercept the current change curve segment within one temperature analysis period after the abnormal inflection point and input it into the thermal simulation model, and calculate the theoretical value of the temperature change generated when the heat generated by the circuit in the area to be monitored under the action of the current is conducted to the branch cable.

[0105] Specifically, based on the current-time curve, intercept the current change curve segment within one temperature analysis period after the abnormal inflection point and input it into the thermal simulation model, so as to evaluate the heat generation amount of the circuit in the area to be monitored caused by the current magnitude and change situation within this period, as well as the heat dissipation amount of the circuit in the monitoring area within this period, and the heat conduction situation, and then calculate the theoretical value of the temperature change generated at the branch cable when the heat is conducted to the branch cable.

[0106] S52: Obtain the measured value of the temperature change measured by the branch cable, and calculate the quotient of the measured value of the temperature change and the theoretical value of the temperature change to obtain the deviation rate.

[0107] Specifically, obtain the measured value of the temperature change measured by the branch cable, and calculate the deviation rate according to the quotient of the measured value of the temperature change and the theoretical value of the temperature change, so as to know the difference between the actual temperature change situation and the theoretical temperature change situation on the branch cable.

[0108] S53: When the deviation rate exceeds the preset deviation range, generate a safety disposal instruction to control the power supply state of the corresponding branch, and at the same time generate a safety alarm message and send it to the user terminal.

[0109] Specifically, when the deviation rate exceeds the deviation range, it is considered that the deviation of the measured value of the temperature change relative to the theoretical value of the temperature change is too large, generate a safety disposal instruction to control the power supply state of the corresponding branch to prevent potential electrical safety hazards, generate a safety alarm message and send it to the user terminal, so as to prompt the user to be vigilant about possible safety accidents and eliminate safety hazards in time.

[0110] It should be understood that the sequence numbers of the steps in the above embodiments do not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0111] Embodiment 2

[0112] An electrical safety monitoring system for a power distribution cabinet, and the electrical safety monitoring system for the power distribution cabinet corresponds to the electrical safety monitoring method for the power distribution cabinet in the above embodiment.

[0113] Such as Figure 2As shown in the figure, the power consumption safety monitoring system of the power distribution cabinet includes a thermal simulation model creation module, a parameter-time curve generation module, a fitting slope comparison module, a measured temperature change module, and a safety disposal instruction generation module. The detailed descriptions of each functional module are as follows:

[0114] The thermal simulation model creation module is used to create a thermal simulation model of the area to be monitored in the thermal simulation program based on the circuit design file of the area to be monitored;

[0115] The parameter-time curve generation module is used to collect the power consumption parameters of each power consumption unit based on a preset sampling frequency, and fit and generate corresponding current-time curves and line temperature-time curves according to the power consumption parameters and sampling time;

[0116] The fitting slope comparison module is used to determine current inflection points one by one from the current-time curve, calculate the fitting slope of the branch supply current within a fluctuation analysis period after the current inflection point, and compare it with a preset qualified slope interval group;

[0117] The measured temperature change module is used to define the current inflection points whose fitting slopes do not conform to the qualified slope interval group as abnormal inflection points, and obtain the measured temperature change values within a temperature analysis period after the abnormal inflection point based on the line temperature-time curve;

[0118] The safety disposal instruction generation module is used to obtain the current change curve segment within a temperature analysis period after the abnormal inflection point from the current-time curve and input it into the thermal simulation model to evaluate the theoretical temperature change value. When the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds the preset deviation interval, a safety disposal instruction is generated to control the power supply state of the corresponding branch line.

[0119] Among them, the thermal simulation model creation module further includes:

[0120] The circuit model creation sub-module is used to obtain the circuit design file of the area to be monitored and create a circuit model based on the size information and position information of each cable in the circuit of the area to be monitored;

[0121] The thermal performance loading sub-module is used to import the circuit model into the thermodynamic simulation program, obtain the heat generation performance information and heat dissipation performance information of each cable from the circuit design file, and mark them on the circuit model to generate a thermal simulation model.

[0122] Among them, the fitting slope comparison module further includes:

[0123] The current change curve segment intercepting sub-module is used to determine current inflection points one by one from the current-time curve and obtain the current change curve segment within a fluctuation analysis period after the current inflection point;

[0124] The fitting slope calculation sub-module is used to obtain the maximum current difference from the current change curve segment, and calculate the quotient of the maximum current difference and the fluctuation analysis period to obtain the fitting slope;

[0125] The slope qualification evaluation sub-module is used to compare the fitting slope with the qualified slope interval group.

[0126] The basic slope interval group setting sub-module is used to determine the measured current corresponding to the current inflection point based on the current-time curve, and set the basic slope interval group based on the measured current and the basic slope interval setting formula;

[0127] The variable current slope interval addition sub-module is used to obtain the variable current slope interval corresponding to the fitting slope when the known variable current working electrical appliance is in variable current operation, and add the variable current slope interval from the basic slope interval group to generate the qualified slope interval group.

[0128] Among them, the safety disposal instruction generation module further includes:

[0129] The theoretical temperature change calculation sub-module is used to intercept the current change curve segment within a temperature analysis period after the abnormal inflection point based on the current-time curve and input it into the thermal simulation model, and calculate the theoretical temperature change generated when the heat generated by the circuit in the area to be monitored under the action of current is conducted to the branch cable;

[0130] The deviation rate calculation sub-module is used to obtain the measured temperature change value measured by the branch cable, and calculate the quotient of the measured temperature change value and the theoretical temperature change value to obtain the deviation rate;

[0131] The safety alarm information generation sub-module is used to generate a safety disposal instruction to control the power supply state of the corresponding branch line when the deviation rate exceeds the preset deviation interval, and simultaneously generate safety alarm information and send it to the user terminal.

[0132] For the specific limitations of the power consumption safety monitoring system of the power distribution cabinet, reference can be made to the limitations of the power consumption safety monitoring method of the power distribution cabinet in the above text, which will not be elaborated here; each module in the above power consumption safety monitoring system of the power distribution cabinet can be implemented in whole or in part through software, hardware and their combinations; the above modules can be embedded in the processor of the computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0133] Embodiment III

[0134] A computer device, which can be a server, and its internal structure diagram can be as Figure 3As shown in the figure. The computer device includes a processor, a memory, a network interface, and a database connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as circuit design files, thermal simulation programs, thermal simulation models, electrical parameters, current-time curves, wire temperature-time curves, fitting slopes, qualified slope interval groups, measured temperature change values, current change curve segments, theoretical temperature change values, deviation rates, deviation intervals, and safety disposal instructions. The network interface of the computer device is used to communicate with external terminals via a network. When the computer program is executed by the processor, it implements a method for monitoring the electrical safety of a power distribution cabinet.

[0135] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented:

[0136] S10: Based on the circuit design file of the area to be monitored, create a thermal simulation model of the area to be monitored in the thermal simulation program;

[0137] S20: Collect the electrical parameters of each power consumption unit based on a preset sampling frequency, and fit and generate corresponding current-time curves and wire temperature-time curves according to the electrical parameters and sampling time;

[0138] S30: Determine the current inflection points one by one from the current-time curve, calculate the fitting slope of the branch supply current within a fluctuation analysis period after the current inflection point, and compare it with the preset qualified slope interval group;

[0139] S40: Define the current inflection points whose fitting slopes do not conform to the qualified slope interval group as abnormal inflection points, and obtain the measured temperature change value within a temperature analysis period after the abnormal inflection point based on the wire temperature-time curve;

[0140] S50: Obtain the current change curve segment within a temperature analysis period after the abnormal inflection point from the current-time curve and input it into the thermal simulation model to evaluate the theoretical temperature change value. When the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds the preset deviation interval, generate a safety disposal instruction to control the power supply state of the corresponding branch line.

[0141] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by the processor, the following steps are implemented:

[0142] S10: Create a thermal simulation model of the area to be monitored in a thermal simulation program based on the circuit design file of the area to be monitored;

[0143] S20: Collect the power consumption parameters of each power consumption unit based on a preset sampling frequency, and fit the corresponding current-time curve and line temperature-time curve according to the power consumption parameters and sampling time;

[0144] S30: Determine the current inflection points one by one from the current-time curve, calculate the fitting slope of the branch supply current within a fluctuation analysis period after the current inflection point, and compare it with a preset group of qualified slope intervals;

[0145] S40: Define the current inflection points whose fitting slopes do not conform to the group of qualified slope intervals as abnormal inflection points, and obtain the measured temperature change value within a temperature analysis period after the abnormal inflection point based on the line temperature-time curve;

[0146] S50: Obtain the current change curve segment within a temperature analysis period after the abnormal inflection point from the current-time curve and input it into the thermal simulation model to evaluate the theoretical temperature change value. When the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds the preset deviation interval, generate a safety disposal instruction to control the power supply state of the corresponding branch line.

[0147] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the various embodiments provided in this application can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink), DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0148] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0149] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for monitoring the electrical safety of a power distribution cabinet, characterized in that, Including: Based on the circuit design file of the area to be monitored, create a thermal simulation model of the area to be monitored in the thermal simulation program; Collect the power consumption parameters of each electricity-consuming unit based on a preset sampling frequency, and fit and generate corresponding current-time curves and line temperature-time curves according to the power consumption parameters and sampling time; Determine the current inflection points one by one from the current-time curve, calculate the fitting slope of the branch supply current within a fluctuation analysis period after the current inflection point, and compare it with a preset qualified slope interval group; Define the current inflection points with fitting slopes that do not conform to the qualified slope interval group as abnormal inflection points, and obtain the measured temperature change value within a temperature analysis period after the abnormal inflection point based on the line temperature-time curve; Obtain the current change curve segment within a temperature analysis period after the abnormal inflection point from the current-time curve and input it into the thermal simulation model to evaluate the theoretical temperature change value. When the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds the preset deviation interval, generate a safety disposal instruction to control the power supply status of the corresponding branch line; The circuit design file records the size information, position information, heat generation performance information, and heat dissipation performance information of each cable; the power consumption parameters include the branch supply current and the branch cable temperature; the current inflection point is the current change time node where the absolute value of the current change value in the current curve is greater than the preset current change threshold; the current change curve segment is the curve intercepted from the current-time curve; Among them, before comparing the fitting slope with the qualified slope interval group, it includes: Based on the current-time curve, determine the measured current corresponding to the current inflection point, and set the basic slope interval group based on the measured current and the basic slope interval setting formula; Obtain the variable current slope interval corresponding to the fitting slope when the known variable current working electrical appliance is in variable current operation, and add the variable current slope interval to the basic slope interval group to generate the qualified slope interval group; Among them, the basic slope interval setting formula is: Among them, α is the first basic angle, β is the second basic angle, I0 is the branch line fictitious current, and I Z is the measured current, c is the current adjustment coefficient, and d is the upper limit value of the fictitious current.

2. The method for monitoring the power consumption safety of a power distribution cabinet according to claim 1, characterized in that: The step of creating a thermal simulation model of the area to be monitored in the thermal simulation program based on the circuit design file of the area to be monitored includes: Obtain the circuit design file of the area to be monitored, and create a circuit model based on the size information and position information of each cable in the circuit of the area to be monitored; Import the circuit model into the thermodynamic simulation program, obtain the heat generation performance information and heat dissipation performance information of each cable from the circuit design file, and mark them in the circuit model to generate a thermal simulation model.

3. The method for monitoring the power consumption safety of a power distribution cabinet according to claim 1, characterized in that: The step of determining the current inflection points one by one from the current-time curve, calculating the fitting slope of the branch supply current within a fluctuation analysis period after the current inflection point, and comparing it with the preset qualified slope interval group includes: Determine the current inflection points one by one from the current-time curve, and obtain the current change curve segment within a fluctuation analysis period after the current inflection point; Obtain the maximum current difference from the current change curve segment, and calculate the quotient of the maximum current difference and the fluctuation analysis period to obtain the fitting slope; Compare the fitting slope with the qualified slope interval group; The qualified slope interval group includes one or more qualified slope intervals; the qualified slope intervals included in the qualified slope interval group cover the current change characteristics of the known variable current working electrical appliances equipped with the corresponding electricity-consuming units.

4. A method for monitoring the power consumption safety of a power distribution cabinet according to claim 1, characterized in that: After obtaining the current change curve segment within a temperature analysis period after the abnormal inflection point from the current-time curve and inputting it into the thermal simulation model to evaluate the theoretical value of temperature change, when the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds the preset deviation range, a safety disposal instruction is generated to control the power supply state of the corresponding branch line, including: Based on the current-time curve, intercept the current change curve segment within a temperature analysis period after the abnormal inflection point and input it into the thermal simulation model to calculate the theoretical value of the temperature change generated when the heat generated by the circuit in the area to be monitored under the action of the current is conducted to the branch cable; Obtain the measured value of the temperature change of the branch cable, and calculate the quotient of the measured value of the temperature change and the theoretical value of the temperature change to obtain the deviation rate; When the deviation rate exceeds the preset deviation range, a safety disposal instruction is generated to control the power supply state of the corresponding branch line, and at the same time, a safety alarm message is generated and sent to the user terminal.

5. An electrical safety monitoring system for a power distribution cabinet, characterized in that, The method for monitoring the electrical safety of the distribution cabinet according to any one of claims 1-4, including: A thermal simulation model creation module for creating a thermal simulation model of the area to be monitored in a thermal simulation program based on the circuit design file of the area to be monitored; A parameter-time curve generation module for collecting the electrical parameters of each electricity-consuming unit based on a preset sampling frequency, and fitting and generating corresponding current-time curves and line temperature-time curves according to the electrical parameters and sampling time; A fitting slope comparison module for successively determining the current inflection points from the current-time curve, calculating the fitting slope of the branch line supply current within a fluctuation analysis period after the current inflection point, and comparing it with a preset qualified slope interval group; A measured temperature change module for defining the current inflection point with a fitting slope not conforming to the qualified slope interval group as an abnormal inflection point, and obtaining the measured value of the temperature change within a temperature analysis period after the abnormal inflection point based on the line temperature-time curve; A safety disposal instruction generation module for obtaining the current change curve segment within a temperature analysis period after the abnormal inflection point from the current-time curve and inputting it into the thermal simulation model to evaluate the theoretical value of temperature change. When the deviation rate of the measured temperature change value relative to the theoretical temperature change value exceeds the preset deviation range, a safety disposal instruction is generated to control the power supply state of the corresponding branch line; the circuit design file records the size information, position information, heat generation performance information, and heat dissipation performance information corresponding to each cable; the electrical parameters include the branch line supply current and the branch cable temperature; the current inflection point is the current change time node at which the absolute value of the current change value in the current curve is greater than the preset current change threshold; the current change curve segment is the curve intercepted from the current-time curve; Among them, before comparing the fitting slope with the qualified slope interval group, it includes: Based on the current-time curve, determine the measured current corresponding to the current inflection point, and set the basic slope interval group based on the measured current and the basic slope interval setting formula; Obtain the variable current slope interval corresponding to the fitting slope when the known variable current working electrical appliance is working with variable current, and add the variable current slope interval to the basic slope interval group to generate the qualified slope interval group; Among them, the basic slope interval setting formula is: where α is the first basic angle, β is the second basic angle, I0 is the branch line fictitious current, I Z is the measured current, c is the current adjustment coefficient, and d is the upper limit value of the fictitious current.

6. The power consumption safety monitoring system of a power distribution cabinet according to claim 5, characterized in that: The thermal simulation model creation module includes: A circuit model creation sub-module, configured to obtain a circuit design file of the area to be monitored, and create a circuit model based on the size information and position information of each cable in the circuit of the area to be monitored; A thermal performance loading sub-module, configured to import the circuit model into a thermodynamic simulation program, obtain the heat generation performance information and heat dissipation performance information of each cable from the circuit design file, and mark them on the circuit model to generate a thermal simulation model.

7. The power consumption safety monitoring system of a power distribution cabinet according to claim 5, wherein: The fitting slope comparison module includes: A current change curve segment intercepting sub-module, configured to sequentially determine current inflection points from the current-time curve, and obtain the current change curve segment within a fluctuation analysis period after the current inflection point; A fitting slope calculation sub-module, configured to obtain the maximum current difference from the current change curve segment, and calculate the quotient of the maximum current difference and the fluctuation analysis period to obtain the fitting slope; A slope qualification evaluation sub-module, configured to compare the fitting slope with a group of qualified slope intervals; The group of qualified slope intervals includes one or more qualified slope intervals; the qualified slope intervals included in the group of qualified slope intervals cover the current change characteristics of the known variable current working electrical appliances equipped for the corresponding power consumption unit.

8. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the power consumption safety monitoring method for the power distribution cabinet according to any one of claims 1 to 4.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the power consumption safety monitoring method for the power distribution cabinet according to any one of claims 1 to 4.

Images