A temperature rise test inspection system for electrical equipment and data processing method

Abstract

The present invention discloses a temperature rise test inspection system and data processing method for electrical equipment, wherein the system includes a main control module, which is used to: obtain continuously and synchronously collected electrical equipment temperature information and ambient temperature information; determine the electrical equipment steady-state temperature when the temperature of the electrical equipment reaches a stable state based on the electrical equipment temperature information; determine whether the electrical equipment steady-state temperature needs to be corrected based on the ambient temperature information; if so, determine the corrected final steady-state temperature based on the electrical equipment steady-state temperature and thermal time constant; if not, determine the electrical equipment steady-state temperature as the final steady-state temperature; determine the electrical equipment temperature rise value based on the final steady-state temperature and ambient temperature information; compare the electrical equipment temperature rise value with the standard temperature rise value to determine the temperature rise inspection conclusion information of the electrical equipment. The present invention improves the temperature rise test inspection capability, shortens the temperature rise inspection cycle, saves power resources, and provides test verification technical support for the material and component selection in the new product development process of electrical equipment.

Description

Technical Field

[0001] The invention relates to the field of temperature rise test of electrical equipment, in particular to a temperature rise test inspection system and a data processing method for electrical equipment. Background Art

[0002] Electrical equipment is a general term for circuit breakers, combination switches, frequency converters, contactors and other equipment in the power grid. With the continuous development of economy and technology, the types and quantity of electrical equipment are increasing, and their importance in people's lives, industrial production, aerospace and other fields is increasing. The safety of electrical equipment is directly related to industrial production and social stability. Temperature rise test is an important type inspection item for electrical equipment. National standards and industry standards clearly stipulate the temperature rise value of electrical equipment. At present, the temperature rise test system has a low degree of integration, poor reliability of test results, and lacks a method for correcting data. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention provides a temperature rise test inspection system and data processing method for electrical equipment, which can improve the test accuracy of data in the temperature rise detection process and ensure the fairness of national quality infrastructure activities.

[0004] The present invention discloses an electrical equipment temperature rise test inspection system, comprising a main control module, and connected to the main control module: an electrical equipment temperature detection module, an environment temperature detection module, a display module, a control panel, a warning module, and a data storage device;

[0005] Wherein, the electrical equipment temperature detection module and the ambient temperature detection module are used to continuously and synchronously collect electrical equipment temperature information and ambient temperature information respectively;

[0006] The main control module is used for:

[0007] Obtain the continuously and synchronously collected electrical appliance temperature information and ambient temperature information;

[0008] Determining the electrical appliance steady-state temperature when the temperature of the electrical appliance reaches a stable state based on the electrical appliance temperature information;

[0009] Determining whether the steady-state temperature of the electrical appliance needs to be corrected based on the ambient temperature information;

[0010] If yes, then determining the corrected final steady-state temperature based on the appliance steady-state temperature and the thermal time constant; if no, then determining the appliance steady-state temperature as the final steady-state temperature;

[0011] Determine the temperature rise value of the electrical appliance based on the final steady-state temperature and the ambient temperature information;

[0012] Compare the temperature rise value of the electrical appliance with the standard temperature rise value to determine the temperature rise inspection conclusion information of the electrical equipment.

[0013] Further, the step of determining the electrical appliance steady-state temperature when the temperature of the electrical appliance reaches a stable state based on the electrical appliance temperature information includes:

[0014] The current temperature of the appliance collected at the current moment and the comparative temperature of the appliance collected at the comparative moment are determined in real time based on the temperature information of the appliance;

[0015] Determining a temperature change value of the electrical appliance based on the current temperature of the electrical appliance and the comparison temperature;

[0016] When the temperature change value of the electrical appliance is less than a first change threshold, determining the current temperature of the electrical appliance as the steady-state temperature of the electrical appliance;

[0017] The difference between the current moment and the corresponding comparison moment is always a preset interval time.

[0018] Further, judging whether it is necessary to correct the steady-state temperature of the electrical appliance based on the ambient temperature information includes:

[0019] Acquire the current temperature of the environment and the comparative temperature of the environment based on the ambient temperature information;

[0020] Determine an ambient temperature change value based on the ambient current temperature and the ambient comparative temperature;

[0021] When the ambient temperature change value is greater than a second change threshold, determining that the steady-state temperature of the electrical appliance needs to be corrected;

[0022] The current environment temperature and the comparative environment temperature are collected at the same time as the current temperature of the electrical appliance and the comparative temperature of the electrical appliance respectively.

[0023] Furthermore, if yes, determining the corrected final steady-state temperature based on the electrical appliance steady-state temperature and the thermal time constant includes:

[0024] Determining a test temperature-time mapping relationship reflecting the relationship between the temperature of the electrical device and time, a thermal time constant, and a steady-state temperature of the electrical device;

[0025] Determine the initial moment, the first preceding moment, and the second succeeding moment in the temperature rise process;

[0026] Correcting the ambient temperature to be unchanged, determining the temperature at the initial moment, the ambient temperature at the first moment, and the ambient temperature at the second moment during the temperature rise process;

[0027] Determine a first temperature mapping relationship of the electrical device at the first moment based on the test temperature-time mapping relationship, the initial moment temperature, and the first moment ambient temperature;

[0028] Determine a second temperature mapping relationship of the electrical device at the second moment based on the test temperature-time mapping relationship, the temperature at the initial moment, and the ambient temperature at the second moment;

[0029] determining the thermal time constant based on the first temperature mapping relationship and the second temperature mapping relationship;

[0030] Determining a modified temperature-time mapping relationship based on the thermal time constant and the first temperature mapping relationship;

[0031] The final steady-state temperature is determined based on the modified temperature-time mapping relationship.

[0032] Further, the determining the temperature rise value of the electrical appliance based on the final steady-state temperature and the ambient temperature information includes:

[0033] Determine, based on the ambient temperature information, an average ambient temperature from a third moment after the start of collecting the ambient temperature information to a time when the temperature of the electrical device reaches a stable state;

[0034] The temperature rise value of the electrical appliance is determined based on the final steady-state temperature and the average ambient temperature.

[0035] The present invention also discloses a data processing method for a temperature rise test of an electrical device, comprising:

[0036] Obtain the continuously and synchronously collected electrical appliance temperature information and ambient temperature information;

[0037] Determining the electrical appliance steady-state temperature when the temperature of the electrical appliance reaches a stable state based on the electrical appliance temperature information;

[0038] Determining whether the steady-state temperature of the electrical appliance needs to be corrected based on the ambient temperature information;

[0039] If yes, then determining the corrected final steady-state temperature based on the appliance steady-state temperature and the thermal time constant; if no, then determining the appliance steady-state temperature as the final steady-state temperature;

[0040] Determine the temperature rise value of the electrical appliance based on the final steady-state temperature and the ambient temperature information;

[0041] Compare the temperature rise value of the electrical appliance with the standard temperature rise value to determine the temperature rise inspection conclusion information of the electrical equipment.

[0042] Further, the step of determining the electrical appliance steady-state temperature when the temperature of the electrical appliance reaches a stable state based on the electrical appliance temperature information includes:

[0043] The current temperature of the appliance collected at the current moment and the comparative temperature of the appliance collected at the comparative moment are determined in real time based on the temperature information of the appliance;

[0044] Determining a temperature change value of the electrical appliance based on the current temperature of the electrical appliance and the comparison temperature;

[0045] When the temperature change value of the electrical appliance is less than a first change threshold, determining the current temperature of the electrical appliance as the steady-state temperature of the electrical appliance;

[0046] The difference between the current moment and the corresponding comparison moment is always a preset interval time.

[0047] Further, judging whether it is necessary to correct the steady-state temperature of the electrical appliance based on the ambient temperature information includes:

[0048] Acquire the current temperature of the environment and the comparative temperature of the environment based on the ambient temperature information;

[0049] Determine an ambient temperature change value based on the ambient current temperature and the ambient comparative temperature;

[0050] When the ambient temperature change value is greater than a second change threshold, determining that the steady-state temperature of the electrical appliance needs to be corrected;

[0051] The current environment temperature and the comparative environment temperature are collected at the same time as the current temperature of the electrical appliance and the comparative temperature of the electrical appliance respectively.

[0052] Furthermore, if yes, determining the corrected final steady-state temperature based on the electrical appliance steady-state temperature and the thermal time constant includes:

[0053] Determining a test temperature-time mapping relationship reflecting the relationship between the temperature of the electrical device and time, a thermal time constant, and a steady-state temperature of the electrical device;

[0054] Determine the initial moment, the first preceding moment, and the second succeeding moment in the temperature rise process;

[0055] Correcting the ambient temperature to be unchanged, determining the temperature at the initial moment, the ambient temperature at the first moment, and the ambient temperature at the second moment during the temperature rise process;

[0056] Determine a first temperature mapping relationship of the electrical device at the first moment based on the test temperature-time mapping relationship, the initial moment temperature, and the first moment ambient temperature;

[0057] Determine a second temperature mapping relationship of the electrical device at the second moment based on the test temperature-time mapping relationship, the temperature at the initial moment, and the ambient temperature at the second moment;

[0058] determining the thermal time constant based on the first temperature mapping relationship and the second temperature mapping relationship;

[0059] Determining a modified temperature-time mapping relationship based on the thermal time constant and the first temperature mapping relationship;

[0060] The final steady-state temperature is determined based on the modified temperature-time mapping relationship.

[0061] Further, the determining the temperature rise value of the electrical appliance based on the final steady-state temperature and the ambient temperature information includes:

[0062] Determine, based on the ambient temperature information, the average ambient temperature from the third moment after the start of collecting the ambient temperature information to the time when the temperature of the electrical equipment reaches a stable state;

[0063] The temperature rise value of the appliance is determined based on the final steady-state temperature and the average ambient temperature.

[0064] The present invention has at least the following beneficial effects:

[0065] The present invention proposes a temperature rise test inspection system and data processing method for electrical equipment. Through improvements in both structure and method, the temperature rise test inspection capability is improved, the temperature rise inspection cycle is shortened, power resources are saved, the technological content of products is increased, and test verification technical support is provided for the selection of materials and components in the research and development process of new products of electrical equipment, thereby ensuring the product quality of electrical equipment and promoting the sustainable and healthy development of the detection and inspection and electrical fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0067] Figure 1 It is a system principle diagram of a temperature rise test inspection system for electrical equipment disclosed in an embodiment of the present invention.

[0068] Figure 2 It is a circuit structure diagram of the warning module disclosed in the embodiment of the present invention.

[0069] Figure 3 The invention discloses a method flow chart of a method for processing temperature rise test data of an electrical equipment.

[0070] Figure 4 The present invention discloses a flow chart for judging the end of a temperature rise test of an electrical device.

[0071] Figure 5 The present invention discloses a flow chart for calculating the temperature rise test results of electrical equipment.

[0072] Figure 6 It is a correction analysis diagram of temperature rise data of electrical equipment disclosed in an embodiment of the present invention.

[0073] Among them, 1-main control module, 2-control panel, 3-warning module, 4-data storage device, 5-display screen, 6-communication module, 7-analog expansion module B, 8-analog expansion module A, 9-thermocouple group A, 10-electrical equipment, 11-thermocouple group B, 12-humidity sensor, 13-wind speed sensor, 14-air pressure sensor, 15-switching power supply. DETAILED DESCRIPTION

[0074] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0075] The present invention discloses a temperature rise test inspection system for electrical equipment, including a main control module, and connected to the main control module: an electrical equipment temperature detection module for detecting the temperature of the electrical equipment, an ambient temperature detection module for detecting the temperature of the surrounding environment, a display module, a control panel, a warning module, and a data storage device. The main control module has functions such as data reception, processing, and storage, and can preferably be implemented using an existing model of PLC. The specific structure and working principle will not be repeated in the present invention. The display module can display the detection process and detection results, such as the temperature of the electrical equipment, the temperature of the surrounding environment, the conclusion of the temperature rise test, etc. The control panel can realize personnel control of the system through physical / virtual buttons, such as powering on the control system. The warning module can reflect the current working status or results of the system by changing the color of the indicator light. The data storage device can save detection, analysis and processing data, and can be read and called.

[0076] In such Figure 1In the preferred embodiment of the present invention shown, the electrical equipment temperature rise test inspection system specifically includes: a main control module 1 (PLC), an electrical equipment temperature detection module (including a thermocouple group A9 and an analog expansion module A8) connected to the main control module 1, an ambient temperature detection module (including a thermocouple group B11 and an analog expansion module B7), a switching power supply 15, a display screen 5, a communication module 6, a control panel 2, a warning module 3, a data storage device 4, a humidity sensor 12, an air pressure sensor 14, and a wind speed sensor 13. Among them, the electrical equipment temperature detection module and the ambient temperature detection module are respectively used to continuously and synchronously collect electrical equipment temperature information and ambient temperature information, the test end of the thermocouple group A9 is connected to the temperature rise test part of the electrical equipment 10 to be tested, the signal output end of the thermocouple group A9 is connected to the signal input end (multi-way input) of the analog expansion module A8, the signal output end (multi-way output) of the analog expansion module A8 is connected to the phase of PLC1, the test end of the thermocouple group B11 is connected to the test part for checking the ambient temperature, the signal output end of the thermocouple group B11 is connected to the signal input end (multi-way input) of the analog expansion module B7, the signal output end (multi-way output) of the analog expansion module B7 is connected to the phase of PLC1, the voltage input end of the switching power supply 15 is connected to the power grid The voltage output end (multi-channel output) of the switching power supply 15 is respectively connected to the voltage input ends of PLC1, analog expansion module A8, analog expansion module B7, display screen 5, control panel 2, and warning module 3, the signal input end of the display screen 5 is connected to the signal output end of the communication module 6, the signal input end of the communication module 6 is connected to the communication signal output end of PLC1, the signal output end of the control panel 2 is connected to the signal input end of PLC1, the signal input end of the warning module 3 is connected to the signal output end of PLC1, the signal input end of the data storage device 4 is connected to the storage signal output end of PLC1, and the signal output ends of the humidity sensor 12, the air pressure sensor 14, and the wind speed sensor 13 are respectively connected to the signal input end of PLC1.

[0077] like Figure 2As shown, the warning module 3 is used to receive the digital output signal of PLC1, and the warning light is color-coded to display the working status of the system. Green means that the system can perform temperature rise test normally after self-check; red means system failure; yellow means that temperature data collection is in progress; blue means that temperature collection is completed and temperature rise calculation is in progress; blue means that the temperature rise test is over. The warning module circuit includes capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, GM34063, ground GND1, ground GND2, inductor L1, inductor L2, transistor VT1, transistor VT2, diode D1 and display diode LED1. One end of capacitor C1 is connected to the PLC signal input port, one end of resistor R1, ground GND1 and GM34063 terminal 6. The other end of resistor R1 is connected to GM34063 terminal 1, GM34063 terminal 7 and GM34063 terminal 8. GM34063 terminal 5 is connected to one end of resistor R2 and one end of resistor R3. Terminal 2 of GM34063 is connected to one end of diode D1 and one end of inductor L1. Terminal 3 of GM34063 is connected to capacitor C1. 2, the other end of the capacitor is connected to the terminal 4 of GM34063, the ground GND2, and the other end of the diode D1, the other end of the inductor L1 is connected to the other end of the resistor R2, one end of the capacitor C3, one end of the capacitor C4, one end of the inductor L2, and the first terminal of the transistor VT1, the other end of the resistor R3 is connected to the ground GND3, the other end of the capacitor C3, and the other end of the capacitor C4, the second terminal of the transistor VT1 is connected to one end of the resistor R4 and one end of the capacitor C5, the other end of the capacitor C5 is connected to the other end of the inductor L2, the first terminal of the transistor VT2, and one end of the diode LED1, the other end of the diode LED1 is connected to the third terminal of the transistor VT2 and the other end of the resistor R4, the third terminal of the transistor VT1 is connected to one end of the resistor R5, and the other end of the resistor R5 is connected to the second terminal of the transistor VT2.

[0078] In the present invention, the working process of the temperature rise test inspection system for electrical equipment includes:

[0079] 1) Turn on the power switch on the control panel. The system will self-check after power-on. If there is any abnormality, the warning module will alarm.

[0080] 2) The control panel sends a system startup command, the temperature acquisition system starts working, and the PLC starts collecting electrical equipment and ambient temperature data.

[0081] 3) PLC processes the collected data to determine whether the temperature rise test is completed. If the temperature rise test is completed, temperature data collection will be stopped.

[0082] 4) After data collection is completed, first close the data collection system through the command input unit, and then retrieve the collected temperature data to calculate the temperature rise value.

[0083] 5) After the temperature rise value is calculated, it is compared with the data required by the standard to determine whether the temperature rise test of the measuring part of the electrical equipment is qualified.

[0084] 6) The PLC transmits the calculation results to the display screen through the communication module, and the warning module indicates that the temperature rise test is completed.

[0085] In the present invention, the main control module is used for:

[0086] Obtain the continuously and synchronously collected electrical appliance temperature information and ambient temperature information;

[0087] Determining the electrical appliance steady-state temperature when the temperature of the electrical appliance reaches a stable state based on the electrical appliance temperature information;

[0088] Determining whether the steady-state temperature of the electrical appliance needs to be corrected based on the ambient temperature information;

[0089] If yes, then determining the corrected final steady-state temperature based on the appliance steady-state temperature and the thermal time constant; if no, then determining the appliance steady-state temperature as the final steady-state temperature;

[0090] Determine the temperature rise value of the electrical appliance based on the final steady-state temperature and the ambient temperature information;

[0091] Compare the temperature rise value of the electrical appliance with the standard temperature rise value to determine the temperature rise inspection conclusion information of the electrical equipment.

[0092] In some embodiments of the present invention, determining the electrical appliance steady-state temperature when the temperature of the electrical appliance reaches a stable state based on the electrical appliance temperature information includes:

[0093] The current temperature of the appliance collected at the current moment and the comparative temperature of the appliance collected at the comparative moment are determined in real time based on the temperature information of the appliance;

[0094] Determining a temperature change value of the electrical appliance based on the current temperature of the electrical appliance and the comparison temperature;

[0095] When the temperature change value of the electrical appliance is less than a first change threshold, determining the current temperature of the electrical appliance as the steady-state temperature of the electrical appliance;

[0096] The difference between the current moment and the corresponding comparison moment is always a preset interval time.

[0097] In some embodiments of the present invention, the determining whether the steady-state temperature of the electrical appliance needs to be corrected based on the ambient temperature information includes:

[0098] Acquire the current temperature of the environment and the comparative temperature of the environment based on the ambient temperature information;

[0099] Determine an ambient temperature change value based on the ambient current temperature and the ambient comparative temperature;

[0100] When the ambient temperature change value is greater than a second change threshold, determining that the steady-state temperature of the electrical appliance needs to be corrected;

[0101] The current environment temperature and the comparative environment temperature are collected at the same time as the current temperature of the electrical appliance and the comparative temperature of the electrical appliance respectively.

[0102] In some embodiments of the present invention, if the temperature is the same as the temperature of the electrical appliance and the thermal time constant, determining the corrected final steady-state temperature comprises:

[0103] Determining a test temperature-time mapping relationship reflecting the relationship between the temperature of the electrical device and time, a thermal time constant, and a steady-state temperature of the electrical device;

[0104] Determine the initial moment, the first preceding moment, and the second succeeding moment in the temperature rise process;

[0105] Correcting the ambient temperature to be unchanged, determining the temperature at the initial moment, the ambient temperature at the first moment, and the ambient temperature at the second moment during the temperature rise process;

[0106] Determine a first temperature mapping relationship of the electrical device at the first moment based on the test temperature-time mapping relationship, the initial moment temperature, and the first moment ambient temperature;

[0107] Determine a second temperature mapping relationship of the electrical device at the second moment based on the test temperature-time mapping relationship, the temperature at the initial moment, and the ambient temperature at the second moment;

[0108] determining the thermal time constant based on the first temperature mapping relationship and the second temperature mapping relationship;

[0109] Determining a modified temperature-time mapping relationship based on the thermal time constant and the first temperature mapping relationship;

[0110] The final steady-state temperature is determined based on the modified temperature-time mapping relationship.

[0111] In some embodiments of the present invention, determining the temperature rise value of the electrical appliance based on the final steady-state temperature and the ambient temperature information includes:

[0112] Determine, based on the ambient temperature information, an average ambient temperature from a third moment after the start of collecting the ambient temperature information to a time when the temperature of the electrical device reaches a stable state;

[0113] The temperature rise value of the electrical appliance is determined based on the final steady-state temperature and the average ambient temperature.

[0114] like Figure 3 to Figure 6 As shown, the present invention also discloses a data processing method for a temperature rise test of an electrical device, which can be applied to the temperature rise test inspection system of the electrical device disclosed above, comprising:

[0115] S1: Acquire the continuously and synchronously collected electrical equipment temperature information and environmental temperature information. The electrical equipment temperature information and environmental temperature information include the temperatures of all electrical equipment and the environment continuously collected from the beginning to the end of the test.

[0116] S2: Determine the steady-state temperature of the electrical equipment when the temperature of the electrical equipment reaches a stable state based on the electrical equipment temperature information. Preferably, when the temperature of the electrical equipment reaches a stable state, the electrical equipment temperature rise test inspection system stops collecting and acquiring the electrical equipment temperature information and the ambient temperature information.

[0117] S3: Determine whether the steady-state temperature of the electrical appliance needs to be corrected based on the ambient temperature information.

[0118] S4: If yes, determine the corrected final steady-state temperature based on the appliance steady-state temperature and the thermal time constant; if no, determine the appliance steady-state temperature as the final steady-state temperature.

[0119] S5: Determine the temperature rise value of the electrical appliance based on the final steady-state temperature and the ambient temperature information.

[0120] S6: Compare the temperature rise value of the electrical equipment with the standard temperature rise value to determine the temperature rise inspection conclusion information of the electrical equipment. The standard temperature rise value can be determined according to the actual situation and pre-stored in the data storage device, and can be called during the comparison.

[0121] In some embodiments of the present invention, for step S1, the acquisition frequencies of the electrical equipment temperature detection module and the ambient temperature detection module are the same and synchronized. Preferably, the acquisition frequency is one minute.

[0122] The step S2 specifically includes:

[0123] S201: Based on the temperature information of the electrical appliance, the current temperature of the electrical appliance collected at the current moment and the comparative temperature of the electrical appliance collected at the comparative moment are determined in real time, wherein the difference between the current moment and the corresponding comparative moment is always a preset interval time, that is, as the current moment advances, the collection moment also advances, and the interval time between the two remains fixed. Preferably, the interval time is one hour.

[0124] S202: Determine the temperature change value of the electrical appliance based on the current temperature of the electrical appliance and the comparison temperature. Specifically, the temperature change value of the electrical appliance is determined by calculating the difference between the current temperature of the electrical appliance and the comparison temperature. The expression is as follows:

[0125] ΔT=T n -T n-60 (1)

[0126] Where, ΔT is the temperature change of the appliance, in Kelvin (K); T n is the temperature at the test time, i.e. the current temperature of the appliance, in degrees Celsius (℃); T n-60 It is the temperature 60 minutes before the test time point, i.e. the comparison temperature, in degrees Celsius (℃).

[0127] S203: When the temperature change value of the electrical appliance is less than the first change threshold, determine that the current temperature of the electrical appliance is the steady-state temperature of the electrical appliance. According to national standards, if the temperature rise value at two points is less than 1K with an interval of 1 hour, it is considered that the temperature has reached a stable state, the temperature rise test is over, and the temperature collection of the electrical equipment is stopped. When ΔT≥1, the temperature change has not reached a stable state, and temperature data continues to be collected and calculated until ΔT<1 occurs; when ΔT<1, the temperature has reached a stable state, the temperature rise test is over, and the temperature at the test time point T n This is the steady-state temperature of the appliance.

[0128] In some embodiments of the present invention, step S3 includes:

[0129] S301: Acquire the current environment temperature and the comparative environment temperature based on the environment temperature information, wherein the current environment temperature and the comparative environment temperature are collected at the same time as the current temperature of the electrical appliance and the comparative temperature of the electrical appliance, respectively.

[0130] S302: Determine an ambient temperature change value based on the ambient current temperature and the ambient comparative temperature, wherein the ambient temperature change value may be calculated by referring to the above-disclosed method for calculating the temperature change value of an electrical device.

[0131] S303: When the change value of the ambient temperature is greater than a second change threshold, it is determined that the steady-state temperature of the electrical appliance needs to be corrected. Preferably, when the change value of the ambient temperature is greater than 3K, correction is required.

[0132] In some embodiments of the present invention, step S4 specifically includes:

[0133] S401: Determine a test temperature-time mapping relationship that reflects the relationship between the temperature of the electrical device and time, the thermal time constant, and the steady-state temperature of the electrical device. Specifically, the mapping relationship expression is as follows:

[0134]

[0135] Among them, τ w is the stable temperature of the electrical equipment, and T is the thermal time constant.

[0136] S402: Determine the initial moment, the first moment before, and the second moment after in the temperature rise process. Figure 6 As shown, the initial moment is the origin of the coordinates, the first moment corresponds to t1 in the figure, and the second moment corresponds to t2 in the figure. Preferably, in order to facilitate the analysis and processing of the correction process, t2=2t1.

[0137] S403: Correct the ambient temperature to be unchanged, and determine the initial temperature, the first ambient temperature, and the second ambient temperature during the temperature rise process. Since the ambient air temperature is set unchanged after correction, the first ambient temperature and the second ambient temperature are both 0, that is, τ 01 =τ 02 =0.

[0138] S404: Determine a first temperature mapping relationship of the electrical device at the first moment based on the test temperature-time mapping relationship, the initial moment temperature, and the first moment ambient temperature.

[0139] S405: Determine a second temperature mapping relationship of the electrical device at the second moment based on the test temperature-time mapping relationship, the temperature at the initial moment, and the ambient temperature at the second moment.

[0140] For steps S404 to S405, according to the above expression (2), the temperature of the electrical equipment increases exponentially with time. At time t1, the temperature of the electrical equipment is:

[0141]

[0142] At time t2, the temperature of the electrical equipment is:

[0143]

[0144] Since the corrected ambient temperature is unchanged and t2=2t1, the above expressions (3) and (4) can also be expressed as (5) and (6) as follows:

[0145]

[0146]

[0147] S406: Determine the thermal time constant based on the first temperature mapping relationship and the second temperature mapping relationship. Specifically, the above expressions (5) and (6) are subtracted to obtain:

[0148]

[0149] Dividing the above expression (7) by expression (5) yields:

[0150]

[0151] Based on the above expressions, the thermal time constant can be calculated:

[0152]

[0153] S407: Determine a modified temperature-time mapping relationship based on the thermal time constant and the first temperature mapping relationship. Specifically, based on the above expression (9) and expression (3), the modified temperature-time mapping relationship can be derived as follows:

[0154]

[0155] S408: Determine the final steady-state temperature based on the corrected temperature-time mapping relationship.

[0156] In some embodiments of the present invention, step S5 specifically includes:

[0157] S501: Determine the average ambient temperature from the third moment after the start of collecting ambient temperature information to the time when the temperature of the electrical equipment reaches a stable state based on the ambient temperature information. For ease of understanding, the time from the start of the test to the time when the temperature of the electrical equipment reaches a stable state can be divided into four equal test cycles that are carried out sequentially on the time axis. The third moment is the last moment of the third test cycle and the beginning moment of the fourth test cycle. The temperature rise value of the electrical equipment is the steady-state temperature of the electrical equipment minus the average ambient temperature in the last quarter of the cycle. The temperature rise value of the electrical equipment τ w The expression is:

[0158]

[0159] in, It is the average ambient temperature of the fourth test cycle after the temperature rise test, in degrees Celsius (℃). The calculation is as follows:

[0160]

[0161] Simplifying the above (12) we can get:

[0162]

[0163] S502: Determine the temperature rise of the electrical appliance based on the final steady-state temperature and the average ambient temperature. Specifically, based on the above expressions (11) and (13), it can be obtained that:

[0164]

[0165] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A temperature rise test inspection system for electrical equipment, characterized in that: It includes a main control module, and connected to the main control module: an electrical equipment temperature detection module, an ambient temperature detection module, a display module, a control panel, a warning module, and a data storage device; Wherein, the electrical equipment temperature detection module and the ambient temperature detection module are used to continuously and synchronously collect electrical equipment temperature information and ambient temperature information respectively; The main control module is used for: Obtain the continuously and synchronously collected electrical appliance temperature information and ambient temperature information; Determining the electrical appliance steady-state temperature when the temperature of the electrical appliance reaches a stable state based on the electrical appliance temperature information; Determining whether the steady-state temperature of the electrical appliance needs to be corrected based on the ambient temperature information; If yes, then determining the corrected final steady-state temperature based on the appliance steady-state temperature and the thermal time constant; if no, then determining the appliance steady-state temperature as the final steady-state temperature; Determine the temperature rise value of the electrical appliance based on the final steady-state temperature and the ambient temperature information; Comparing the temperature rise value of the electrical equipment with the standard temperature rise value to determine the temperature rise inspection conclusion information of the electrical equipment; If yes, then determining the corrected final steady-state temperature based on the electrical appliance steady-state temperature and the thermal time constant includes: Determining a test temperature-time mapping relationship reflecting the relationship between the temperature of the electrical device and time, a thermal time constant, and a steady-state temperature of the electrical device; Determine the initial moment, the first preceding moment, and the second succeeding moment in the temperature rise process; Correcting the ambient temperature to be unchanged, determining the temperature at the initial moment, the ambient temperature at the first moment, and the ambient temperature at the second moment during the temperature rise process; Determine a first temperature mapping relationship of the electrical device at the first moment based on the test temperature-time mapping relationship, the initial moment temperature, and the first moment ambient temperature; Determine a second temperature mapping relationship of the electrical device at the second moment based on the test temperature-time mapping relationship, the temperature at the initial moment, and the ambient temperature at the second moment; determining the thermal time constant based on the first temperature mapping relationship and the second temperature mapping relationship; Determining a modified temperature-time mapping relationship based on the thermal time constant and the first temperature mapping relationship; Determining the final steady-state temperature based on the modified temperature-time mapping relationship; The determining of the temperature rise value of the electrical appliance based on the final steady-state temperature and the ambient temperature information comprises: Based on the ambient temperature information, the average ambient temperature from the third moment after the start of collecting the ambient temperature information to the time when the temperature of the electrical equipment reaches a stable state is determined, and the calculation expression is as follows: The time from the start of the test to the time when the temperature of the electrical equipment reaches a stable state is divided into four equal test cycles that are carried out in sequence on the time axis, and the third moment is the last moment of the third test cycle and the start moment of the fourth test cycle; The average ambient temperature of one quarter of the cycle after the temperature rise test, in degrees Celsius: The temperature rise value of the electrical appliance is determined based on the final steady-state temperature and the average ambient temperature; specifically, the temperature rise value of the electrical appliance τ w The expression is: Among them, T n is the final steady-state temperature.

2. The temperature rise test inspection system for electrical equipment according to claim 1 is characterized in that: The step of determining the steady-state temperature of the electrical equipment when the temperature of the electrical equipment reaches a stable state based on the electrical equipment temperature information comprises: The current temperature of the appliance collected at the current moment and the comparative temperature of the appliance collected at the comparative moment are determined in real time based on the temperature information of the appliance; Determining a temperature change value of the electrical appliance based on the current temperature of the electrical appliance and the comparison temperature; When the temperature change value of the electrical appliance is less than a first change threshold, determining the current temperature of the electrical appliance as the steady-state temperature of the electrical appliance; The difference between the current moment and the corresponding comparison moment is always a preset interval time.

3. The temperature rise test inspection system for electrical equipment according to claim 2 is characterized in that: The determining whether the steady-state temperature of the electrical appliance needs to be corrected based on the ambient temperature information includes: Acquire the current temperature of the environment and the comparative temperature of the environment based on the ambient temperature information; Determine an ambient temperature change value based on the ambient current temperature and the ambient comparative temperature; When the ambient temperature change value is greater than a second change threshold, determining that the steady-state temperature of the electrical appliance needs to be corrected; The current environment temperature and the comparative environment temperature are collected at the same time as the current temperature of the electrical appliance and the comparative temperature of the electrical appliance respectively.

4. A data processing method for temperature rise test of electrical equipment, characterized in that: include: Obtain the continuously and synchronously collected electrical appliance temperature information and ambient temperature information; Determining the electrical appliance steady-state temperature when the temperature of the electrical appliance reaches a stable state based on the electrical appliance temperature information; Determining whether the steady-state temperature of the electrical appliance needs to be corrected based on the ambient temperature information; If so, determining a corrected final steady-state temperature based on the appliance steady-state temperature and the thermal time constant; If not, determining the electrical appliance steady-state temperature as the final steady-state temperature; Determine the temperature rise value of the electrical appliance based on the final steady-state temperature and the ambient temperature information; Comparing the temperature rise value of the electrical equipment with the standard temperature rise value to determine the temperature rise inspection conclusion information of the electrical equipment; If yes, then determining the corrected final steady-state temperature based on the electrical appliance steady-state temperature and the thermal time constant includes: Determining a test temperature-time mapping relationship reflecting the relationship between the temperature of the electrical device and time, a thermal time constant, and a steady-state temperature of the electrical device; Determine the initial moment, the first preceding moment, and the second succeeding moment in the temperature rise process; Correcting the ambient temperature to be unchanged, determining the temperature at the initial moment, the ambient temperature at the first moment, and the ambient temperature at the second moment during the temperature rise process; Determine a first temperature mapping relationship of the electrical device at the first moment based on the test temperature-time mapping relationship, the initial moment temperature, and the first moment ambient temperature; Determine a second temperature mapping relationship of the electrical device at the second moment based on the test temperature-time mapping relationship, the temperature at the initial moment, and the ambient temperature at the second moment; determining the thermal time constant based on the first temperature mapping relationship and the second temperature mapping relationship; Determining a modified temperature-time mapping relationship based on the thermal time constant and the first temperature mapping relationship; Determining the final steady-state temperature based on the modified temperature-time mapping relationship; The determining of the temperature rise value of the electrical appliance based on the final steady-state temperature and the ambient temperature information comprises: Based on the ambient temperature information, the average ambient temperature from the third moment after the start of collecting the ambient temperature information to the time when the temperature of the electrical equipment reaches a stable state is determined, and the calculation expression is as follows: The time from the start of the test to the time when the temperature of the electrical equipment reaches a stable state is divided into four equal test cycles that are carried out in sequence on the time axis, and the third moment is the last moment of the third test cycle and the start moment of the fourth test cycle; The average ambient temperature of one quarter of the cycle after the temperature rise test, in degrees Celsius: The temperature rise value of the electrical appliance is determined based on the final steady-state temperature and the average ambient temperature; specifically, the temperature rise value of the electrical appliance τ w The expression is: Among them, T n is the final steady-state temperature.

5. The data processing method for temperature rise test of electrical equipment according to claim 4, characterized in that: The step of determining the steady-state temperature of the electrical equipment when the temperature of the electrical equipment reaches a stable state based on the electrical equipment temperature information comprises: The current temperature of the appliance collected at the current moment and the comparative temperature of the appliance collected at the comparative moment are determined in real time based on the temperature information of the appliance; Determining a temperature change value of the electrical appliance based on the current temperature of the electrical appliance and the comparison temperature; When the temperature change value of the electrical appliance is less than a first change threshold, determining the current temperature of the electrical appliance as the steady-state temperature of the electrical appliance; The difference between the current moment and the corresponding comparison moment is always a preset interval time.

6. The data processing method for temperature rise test of electrical equipment according to claim 5, characterized in that: The determining whether the steady-state temperature of the electrical appliance needs to be corrected based on the ambient temperature information includes: Acquire the current temperature of the environment and the comparative temperature of the environment based on the ambient temperature information; Determine an ambient temperature change value based on the ambient current temperature and the ambient comparative temperature; When the ambient temperature change value is greater than a second change threshold, determining that the steady-state temperature of the electrical appliance needs to be corrected; The current environment temperature and the comparative environment temperature are collected at the same time as the current temperature of the electrical appliance and the comparative temperature of the electrical appliance respectively.

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