A kind of intelligent temperature measurement device and method based on temperature matrix

Abstract

The present application provides an intelligent temperature measuring device and method based on a temperature matrix, which belongs to the field of temperature and heat monitoring of power systems. The temperature measuring device includes: a plurality of temperature sensors, a temperature acquisition and storage unit, a data processing unit, a temperature judgment unit, a fault identification unit and an alarm unit; the present application arranges temperature measuring sensors with different precisions on the components to be measured in the power system, takes into account the problems of cost and measurement precision, and improves the accuracy and reliability of temperature monitoring by means of multi-sensor data fusion; in the process of matrix fusion, the fusion weight factor takes into account the historical change trend of the temperature matrix and the measurement precision of the sensor, so that the fusion result is more reliable and real-time; in the process of generating a complete temperature distribution map, the temperature history trend factor is introduced to improve the accuracy and smoothness of the interpolation; the ease of use and reliability of the interpolation calculation are achieved through a simple temperature history trend factor.

Description

Technical Field

[0001] The present application relates to the field of temperature and heat monitoring of power systems, and in particular to an intelligent temperature measurement device and method based on a temperature matrix. Background Art

[0002] Temperature is a basic physical quantity that measures the heat energy contained in an object. All processes in nature are related to temperature. Many equipment failures are caused by abnormal temperature rise. The power industry pays special attention to the operating temperature of electrical equipment. Under the conditions of tight power consumption and rapid load growth, 0.4kV~35kV switchgear often causes abnormal temperature rise in electrical joints such as contacts and busbars due to manufacturing or use reasons. If it is not discovered and maintained in time, it often causes serious equipment accidents.

[0003] For electrical appliances with rated voltage of 3kV and above and frequency of 50Hz, such as circuit breakers, disconnectors, enclosed combination electrical appliances, metal-enclosed switchgear, load switches and other products, heating tests must be carried out to ensure that the temperature of each part of the electrical appliance does not exceed the value allowed by the standard under the rated working current for a long time. There are certain requirements for the contact resistance at the busbar connection in the high-voltage switch cabinet, and it is tested offline with a "loop resistance tester" before leaving the factory. After the switch cabinet leaves the factory, the contact deteriorates due to transportation, installation, impact, etc., and the contact resistance increases. In particular, when the trolley is pushed in, poor contact at the plug-in causes accidents, resulting in power outages.

[0004] At present, the temperature monitoring methods for key parts of high-voltage switchgear are limited to manual inspections of joints, body temperature and other parts, with a low degree of automation. In addition, the existing substation equipment is large in number and requires a large number of highly qualified maintenance personnel to manage the equipment. Among the existing temperature measurement methods, thermal imaging technology can provide temperature distribution maps of various components inside the switchgear and intuitively identify hot spots, but its cost is high, it is greatly affected by environmental factors, image processing is complex, and it cannot be continuously monitored in real time; non-contact infrared temperature sensors have strict requirements on measurement angles and distances, and are easily affected by environmental interference and affect accuracy. Therefore, power and electrical equipment urgently need an intelligent temperature measurement device and method that can monitor temperature in real time and capture temperature change trends at low cost. Summary of the invention

[0005] The purpose of this application is to solve the above-mentioned problems in the prior art. This application provides an intelligent temperature measurement device and method based on a temperature matrix. Temperature measurement sensors with different accuracies are arranged on the components to be tested in the power system, while considering the issues of cost and measurement accuracy, so as to fully grasp the temperature distribution and discover anomalies in time. The use of low-precision sensors in non-critical locations can significantly reduce the project budget, and the data of high-precision sensors can be used as a benchmark to improve the accuracy of temperature matrix fusion.

[0006] In order to achieve the above objectives, the present application proposes an intelligent temperature measurement method based on a temperature matrix, comprising:

[0007] Step 1, temperature sensor arrangement; at least two temperature sensors are arranged on each component to be monitored in the switch cabinet, and the measurement accuracy of the at least two temperature sensors is not all the same;

[0008] Step 2, temperature data collection and storage; at least two temperature sensors arranged on each of the components to be monitored collect temperature data of each component to be monitored in the switch cabinet at a certain sampling period, and record the temperature value at each time point, and form at least two temperature matrices according to the position relationship of the sensors;

[0009] Step 3, calculating a fusion weight factor of the at least two temperature matrices according to the historical change trend of the at least two temperature matrices and the sensor measurement accuracy;

[0010] Step 4, calculating a fusion temperature matrix according to the fusion weight factors of the at least two temperature matrices;

[0011] Step 5, estimating the temperature of the position where the temperature sensor is not arranged by interpolation through the fused temperature matrix, and generating a complete temperature distribution map;

[0012] Step 6, setting a temperature threshold according to the normal operating temperature range of different components to be monitored;

[0013] Step 7, calculating the temperature gradient;

[0014] Step 8, fault identification: based on the temperature threshold and temperature gradient, identify potential fault areas and fault types;

[0015] Step 9, alarm mechanism; when abnormal temperature or temperature gradient is detected, the system automatically triggers an alarm.

[0016] In some embodiments, three temperature sensors, namely, front, middle and rear temperature sensors, are arranged on the plurality of components to be monitored, and the measurement accuracy of the middle temperature sensor is better than that of the front temperature sensor and the rear temperature sensor.

[0017] In some embodiments, all of the front temperature sensors are located substantially in the same plane, all of the middle temperature sensors are located substantially in the same plane, and all of the rear temperature sensors are located substantially in the same plane.

[0018] In some embodiments, the historical trend matrix of the front, middle and rear temperature sensors is obtained by calculating: ΔT f (t) = T f (t)-T f (t'), ΔT m(t) = T m (t)-T m (t'), ΔT b (t) = T b (t)-T b (t'); where ΔT f (t) is the historical trend matrix of the front temperature sensor, ΔT m (t) is the historical trend matrix of the middle temperature sensor, ΔT b (t) is the historical trend matrix of the rear temperature sensor, T f (t) is the front temperature matrix at time t, T f (t') is the front temperature matrix at the previous moment t' before moment t, T m (t) is the middle temperature matrix at time t, T m (t') is the middle temperature matrix at the previous moment t' before moment t, T b (t) is the rear temperature matrix at time t, T b (t') is the rear temperature matrix at the previous moment t' before moment t; the mean values ​​of the historical trend matrices of the front, middle and rear temperature sensors are respectively: and Where ΔT f,i (t), ΔT m,i (t) and ΔT b,i (t) are the historical trend matrix of the front temperature sensor ΔT m (t), historical trend matrix of middle temperature sensor ΔT m (t) and the rear temperature sensor historical trend matrix ΔT b (t), n is the number of elements of the historical trend matrix of the front, middle and rear temperature sensors; the calculation formulas of the front temperature matrix fusion weight factor α, the middle temperature matrix fusion weight factor β and the rear temperature matrix fusion weight factor γ are as follows:

[0019]

[0020] Among them, E f 、E m and E b The measurement accuracy of the front, middle and rear temperature sensors respectively;

[0021] Fusion temperature matrix T fused (t) = α × T f (t)+β×T m (t)+γ×T b (t).

[0022] In some embodiments, the position coordinates and temperature values ​​of four adjacent temperature points in the fusion temperature matrix are: [(x1, y1), T 11 ]、[(x2,y1),T 21 ]、[(x1,y2),T 12 ] and [(x2,y2),T 22 ]; the position coordinates and temperature points that need to be interpolated are [(x,y), T(x,y)], and the interpolation calculation formula is:

[0023]

[0024] In some embodiments, the temperature history trend factors ω1, ω2, ω3, and ω4 can be introduced into the interpolation calculation formula to convert the current fusion temperature matrix T fused (t) and T at the previous moment t' fused (t′) is subtracted to obtain the temperature change of the fusion temperature matrix; let T 11 , T 21 , T 12 , T 22 The corresponding temperature changes are ΔT 11 , ΔT 21 , ΔT 12 , ΔT 22 , then the temperature historical trend factors ω1, ω2, ω3 and ω4 are expressed as:

[0025]

[0026]

[0027] Among them, C is the balance coefficient, and the balance coefficient C is a constant.

[0028] In some embodiments, the temperature sensor is selected from at least two of RTD, thermocouple, NTC, and semiconductor temperature sensing.

[0029] In some embodiments, the alarm mechanism includes:

[0030] Real-time alarm: The system notifies maintenance personnel through sound and light alarms, text messages, emails, etc.

[0031] Record logs: record abnormal temperature points and times in the system log for subsequent analysis;

[0032] Generate report: Generate temperature monitoring report regularly, including fault point, time and temperature value.

[0033] The present application also provides an intelligent temperature measurement device based on a temperature matrix, comprising:

[0034] Several temperature sensors, at least two temperature sensors are arranged on each component to be monitored in the switch cabinet, and the measurement accuracy of the at least two temperature sensors is not all the same;

[0035] A temperature collection and storage unit collects temperature data of each component to be monitored in the switch cabinet at a certain sampling period from a plurality of temperature sensors arranged on each component to be monitored, and records the temperature value at each time point, and forms at least two temperature matrices according to the position relationship of the sensors;

[0036] A data processing unit calculates a fusion weight factor of at least two temperature matrices according to the historical change trend of the at least two temperature matrices and the sensor measurement accuracy; obtains a fusion temperature matrix by using the fusion weight factor; and estimates the temperature of a position where a temperature sensor is not arranged by interpolation through the fusion temperature matrix to generate a complete temperature distribution map;

[0037] A temperature judgment unit, which compares the temperature of a key part in the temperature distribution diagram and the calculated temperature gradient with a set temperature threshold and temperature gradient;

[0038] A fault identification unit, based on the comparison result of the temperature judgment unit, identifies the potential fault area and fault type;

[0039] Alarm unit, when abnormal temperature or temperature gradient is detected, the system automatically triggers the alarm.

[0040] In some embodiments, all temperature sensors forming a temperature matrix are located substantially in the same plane.

[0041] This application has the following advantages:

[0042] (1) This application uses temperature sensors of different precisions to be arranged on the components to be tested in the power system, taking into account the issues of cost and measurement accuracy. Using low-precision sensors in non-critical locations can significantly reduce the project budget, and the data of high-precision sensors can be used as a benchmark to improve the accuracy of temperature matrix fusion;

[0043] (2) The accuracy and reliability of temperature monitoring are improved by multi-sensor data fusion. The fusion weight factor takes into account the historical change trend of the temperature matrix and the sensor measurement accuracy, making the fusion result more reliable and real-time.

[0044] (3) The present application interpolates and estimates the temperature at locations where temperature sensors are not arranged, and generates a complete temperature distribution diagram, which can provide a more comprehensive understanding of the temperature distribution of the entire system; a temperature history trend factor can be introduced into the interpolation calculation formula to improve the accuracy and smoothness of the interpolation; and the ease and reliability of the interpolation calculation are achieved through a simple temperature history trend factor. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The figure shows the structural diagram of the busbar and cable inlet and outlet installation in the switch cabinet;

[0046] Figure 2 Shown is a flow chart of an intelligent temperature measurement method based on a temperature matrix of the present application;

[0047] Figure 3 Shown is a schematic diagram of the architecture of an intelligent temperature measurement device based on a temperature matrix of the present application;

[0048] Figure 4 Shown is a schematic diagram of the application layer background homepage of the intelligent temperature measurement device. DETAILED DESCRIPTION

[0049] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only the parts related to the present application are shown in the accompanying drawings, rather than all.

[0050] Existing switch cabinet temperature monitoring technology usually uses a single type of temperature sensor, which is arranged at a small number of key points for temperature monitoring. This method has the following problems: insufficient monitoring accuracy. Due to the limited number of sensors arranged, it is impossible to fully reflect the temperature distribution in the switch cabinet; slow response speed. The response speed of a single type of sensor is limited and cannot capture rapidly changing temperatures in time; high cost. High-precision temperature sensors are expensive and cannot be deployed on a large scale.

[0051] The present application proposes a low-cost, high-precision intelligent temperature measurement method and device, which can use temperature measurement sensors with different accuracies to be arranged on the components to be tested in the power system. For example, the busbars and cable connectors in the switch cabinet are the most suitable components for arranging multiple temperature sensors with different accuracies for temperature monitoring. Figure 1The schematic diagram of the structure of the busbar and the cable inlet and outlet installation in the switch cabinet is shown. The busbar will heat up when the current passes through, and its temperature distribution may be different at different positions, especially at the connection point. The temperature of the busbar directly affects the operating efficiency and safety of the switch cabinet. Local overheating may cause equipment failure or fire risk, so high-precision, distributed temperature monitoring is required. The busbar usually has sufficient length and width to accommodate at least three temperature sensors at the front, middle and rear; therefore, the front, middle and rear positions can be monitored to fully grasp the temperature distribution and detect abnormalities in time. The temperature monitoring of the cable joint is also very important for preventing electrical failures and fires. Multi-point monitoring helps to detect and deal with local overheating problems in time. The cable joint is a current-intensive area, and the contact resistance may cause local temperature rise, so it is necessary to monitor its temperature distribution at multiple points. The cable joint part usually has a certain length, which is also suitable for arranging at least three temperature sensors at the front, middle and rear. In the following specific embodiments, the application will take the busbar and cable joint in the switch cabinet as the monitoring object to explain the specific technical scheme of the application in detail.

[0052] like Figure 2 As shown, an intelligent temperature measurement method 100 based on a temperature matrix includes:

[0053] Step S101, temperature sensor arrangement: at least two temperature sensors are arranged on each component to be monitored (busbar, cable connector and other key components) in the switch cabinet, and the measurement accuracy of the at least two temperature sensors are not all the same.

[0054] Taking the switch cabinet with 9 busbars and / or cable joints to be monitored as an example, this embodiment only illustrates the technical solution of the present application by way of example, and is not intended to limit the number of components to be monitored. The front temperature sensor of the busbar is a thermocouple (measurement accuracy: ±1°C to ±2°C), the middle temperature sensor is a thermistor (measurement accuracy: ±0.1°C to ±1°C), and the rear sensor is a thermocouple (measurement accuracy: ±1°C to ±2°C); similarly, the front temperature sensor of the cable joint can use a thermocouple, the middle temperature sensor can use a thermistor, and the rear sensor can use a thermocouple; and the measurement accuracy of all front temperature sensors is the same, the measurement accuracy of all middle temperature sensors is the same, and the measurement accuracy of all rear temperature sensors is the same. The middle part of the switch cabinet components is usually the area where current and heat are concentrated, and the temperature changes are more drastic. The use of high-precision sensors can more accurately monitor the temperature changes in these key locations and detect abnormalities in a timely manner; the use of low-precision sensors in non-critical locations can significantly reduce the project budget; the data of high-precision sensors can be used as a benchmark to improve the accuracy of the entire temperature matrix fusion. Even if low-precision sensors are used on both sides, the overall temperature distribution can still maintain a high degree of accuracy through weighted processing during the fusion process. Preferably, all of the above-mentioned front temperature sensors are roughly located in the same plane, all of the above-mentioned middle temperature sensors are roughly located in the same plane, and all of the above-mentioned rear temperature sensors are roughly located in the same plane; the same plane can be any plane, and is not limited to a vertical plane perpendicular to the horizontal plane.

[0055] When selecting a temperature sensor, it is necessary to consider the cost and measurement accuracy. In actual use, thermocouples have higher measurement accuracy, and thermocouples are lower in cost than other high-precision temperature sensors (such as RTD platinum resistance thermometers); compared with thermocouples, thermistors have relatively low costs and are suitable for temperature monitoring under cost control. Thermistors also have faster response speeds and can quickly capture temperature changes; for temperature monitoring applications that require higher accuracy and faster response, thermistors are a good choice, and their relatively low cost also makes them an economical solution. In other embodiments, at least two can be selected from RTD, thermocouple (K type), NTC, and semiconductor temperature sensors according to the above principles. The use of temperature sensors with different measurement accuracy can greatly reduce the cost of temperature sensors. Although it loses some of the requirements for temperature measurement accuracy, the accuracy and reliability of temperature monitoring can be improved by temperature data fusion in subsequent steps.

[0056] Step S102, temperature data collection and storage; at least two temperature sensors arranged on each component to be monitored collect temperature data of each component to be monitored in the switch cabinet at a certain sampling period, and record the temperature value at each time point, and form at least two temperature matrices according to the position relationship of the sensors.

[0057] For example, each front temperature sensor, middle temperature sensor and rear temperature sensor set on the 9 busbars and / or cable connectors to be monitored in the switch cabinet collects the temperature data of each component to be monitored in the switch cabinet at the current time t, and obtains: front temperature matrix Central temperature matrix Rear temperature matrix Assume that the front temperature sensors, middle temperature sensors and rear temperature sensors installed on the 9 busbars and cable connectors to be monitored in the switch cabinet collect the temperature data of each component to be monitored in the switch cabinet at the previous time t' before the current time t, and obtain the following: Central temperature matrix Rear temperature matrix

[0058] Step S103: calculating a fusion weight factor of the at least two temperature matrices according to the historical change trend of the at least two temperature matrices and the sensor measurement accuracy.

[0059] Such as the front temperature matrix fusion weight factor α, the middle temperature matrix fusion weight factor β and the rear temperature matrix fusion weight factor γ.

[0060] The calculation process of the above weight factors is as follows:

[0061] First, the historical trend matrix of the front, middle and rear temperature sensors is calculated: ΔT f (t) = T f (t)-T f (t'), ΔT m (t) = T m (t)-T m (t'), ΔT b (t) = T b (t)-T b (t');

[0062] Then, the mean of the historical trend matrix of the front, middle and rear temperature sensors is calculated as:

[0063] Where, ΔT f,i (t) is the historical trend matrix ΔT of the front temperature sensor f The i-th element of (t), n is the historical trend matrix ΔT of the front temperature sensor f (t) the number of elements;

[0064] Where, ΔT m,i(t) is the historical trend matrix ΔT of the front temperature sensor m The i-th element of (t), n is the historical trend matrix ΔT of the middle temperature sensor m (t) the number of elements;

[0065] Where, ΔT b,i (t) is the historical trend matrix of the rear temperature sensor ΔT b The i-th element of (t), n is the historical trend matrix ΔT of the rear temperature sensor b (t) the number of elements;

[0066] As mentioned above, there are 9 busbars and / or cable connectors to be monitored in the switch cabinet, then n = 9;

[0067] Finally, the calculation formulas for the front temperature matrix fusion weight factor α, the middle temperature matrix fusion weight factor β, and the rear temperature matrix fusion weight factor γ are as follows:

[0068]

[0069]

[0070] Among them, E f 、E m and E b are the measurement accuracy of the front, middle and rear temperature sensors respectively; μ f , μ m and μ b They are the means of the historical trend matrices of the front, middle, and rear temperature sensors, respectively.

[0071] Step S104, calculating a fusion temperature matrix according to the fusion weight factors of the at least two temperature matrices;

[0072] Calculate the fusion temperature matrix T for the above example fused (t) = α × T f (t)+β×T m (t)+γ×T b (t);

[0073] The fusion temperature matrix combines the data of multiple temperature sensors according to certain weights and algorithms to generate a comprehensive temperature matrix. It provides a more accurate and stable temperature distribution map by comprehensively considering the measurement results of different sensors and specific weight factors. By fusing temperature data at different locations, the impact of single sensor measurement errors can be reduced, thereby improving the overall measurement accuracy. Especially when high-precision sensors are used in the middle and low-precision sensors are used on both sides, the fusion matrix can effectively balance these errors. The fusion temperature matrix can dynamically adjust the weight factors based on historical trend parameters and sensor accuracy, making the fusion results more reliable and real-time. The weight factors can be adjusted based on the stability of historical data and the accuracy of the current sensor, so that the data of high-precision sensors accounts for a larger proportion in the fusion process. The fusion algorithm can also smooth the temperature distribution and reduce the errors caused by fluctuations in individual sensor readings, which is very helpful for forming a stable temperature distribution map and trend analysis.

[0074] Step S105, estimating the temperature of the position where the temperature sensor is not arranged by interpolation through the fused temperature matrix, and generating a complete temperature distribution map;

[0075] Certain components or areas in the switch cabinet may have abnormal temperatures due to poor heat dissipation or excessive load. These hot spots or cold spots may be located where no sensors are installed. Interpolation estimation can provide temperature data for these key locations in the switch cabinet, not just the points where temperature sensors are installed, which can provide a more comprehensive understanding of the temperature distribution of the entire system.

[0076] Assume that the position coordinates and temperature values ​​of four adjacent temperature points in the fusion temperature matrix are known, such as [(x1, y1), T 11 ]、[(x2,y1),T 21 ]、[(x1,y2),T 12 ] and [(x2,y2),T 22 ]; the position coordinates and temperature points that need to be interpolated are [(x,y), T(x,y)], and the interpolation calculation formula is:

[0077]

[0078] Furthermore, the temperature history trend factors ω1, ω2, ω3 and ω4 can be introduced into the interpolation calculation formula to convert the current fusion temperature matrix T fused (t) and T at the previous moment t' fused (t′) to obtain the temperature change of the fusion temperature matrix. 11 , T 21 , T 12 , T 22 The corresponding temperature changes are ΔT11 , ΔT 21 , ΔT 12 , ΔT 22 , then the temperature historical trend factors ω1, ω2, ω3 and ω4 are expressed as:

[0079]

[0080] Wherein, C is a balance coefficient, which is a constant used to adjust the interpolation size. An appropriate balance coefficient is usually selected based on experience. In this application, the value range of C is 3.2≤C≤4.

[0081] The interpolation calculation formula can be optimized as follows:

[0082]

[0083] Locations with large temperature changes in the fused temperature matrix require special attention; increasing their weights during the interpolation process can improve the accuracy and smoothness of the interpolation; and the ease and reliability of the interpolation calculation can be achieved through a simple temperature history trend factor.

[0084] The above calculation method is used to estimate the temperature of the locations where no temperature sensors are arranged one by one, thereby generating a complete temperature distribution map.

[0085] Step S106, setting a temperature threshold according to the normal operating temperature range of different components to be monitored (upper temperature threshold: a temperature value exceeding this value may indicate an overheating fault; lower temperature threshold: a temperature value below this value may indicate a temperature sensor fault or other abnormal conditions).

[0086] Step S107, calculating the temperature gradient (ie, the rate of change of temperature in space; an abnormally high temperature gradient may indicate local overheating or other abnormal conditions).

[0087] Step S108, fault identification: based on the temperature threshold and temperature gradient, identify the potential fault area and fault type. The specific steps are as follows:

[0088] Threshold detection: Check each point in the temperature distribution diagram to see if its temperature exceeds the set upper temperature threshold or is lower than the lower temperature threshold;

[0089] Temperature gradient detection: calculate the temperature gradient of each point and check whether it exceeds the preset gradient threshold;

[0090] Spatial location correlation: Consider the spatial proximity of the fault points. That is, when multiple adjacent points exceed the temperature threshold or gradient threshold, it is more likely to indicate a fault.

[0091] Step S109, alarm mechanism: when abnormal temperature or temperature gradient is detected, the system automatically triggers an alarm. The alarm mechanism may include:

[0092] Real-time alarm: The system notifies maintenance personnel through sound and light alarms, text messages, emails, etc.

[0093] Record logs: record abnormal temperature points and times in the system log for subsequent analysis;

[0094] Generate report: Generate temperature monitoring report regularly, including detailed information such as fault point, time, temperature value, etc.

[0095] An intelligent temperature measurement device based on a temperature matrix provided in an embodiment of the present application is introduced below. The intelligent temperature measurement device described below and the intelligent temperature measurement method based on a temperature matrix described above can refer to each other.

[0096] Figure 3 The figure shows an architecture diagram of an intelligent temperature measuring device based on a temperature matrix of the present application. The temperature sensor is the perception layer of the temperature measuring device, and the network layer undertakes the data relay function. After receiving the data from the temperature sensor, it transmits it to the data background through optical fiber, RS485, GPRS or wireless. After the data reaches the background, the user can monitor the real-time temperature, historical temperature, and equipment operation trend of each sensor on site through Web access. If an over-temperature situation occurs, it can be quickly located and the relevant dispatching personnel can be notified in time. Figure 4 The figure shows a schematic diagram of the application layer background homepage of the intelligent temperature measuring device. The page can display the distribution of temperature sensors, real-time temperature changes, alarm information and equipment operation status.

[0097] An intelligent temperature measurement device based on a temperature matrix provided in an embodiment of the present application includes:

[0098] Several temperature sensors, at least two temperature sensors are arranged on each component to be monitored in the switch cabinet, and the measurement accuracy of the at least two temperature sensors is not all the same;

[0099] A temperature collection and storage unit collects temperature data of each component to be monitored in the switch cabinet at a certain sampling period from a plurality of temperature sensors arranged on each component to be monitored, and records the temperature value at each time point, and forms at least two temperature matrices according to the position relationship of the sensors;

[0100] A data processing unit calculates a fusion weight factor of at least two temperature matrices according to the historical change trend of the at least two temperature matrices and the sensor measurement accuracy; obtains a fusion temperature matrix by using the fusion weight factor; and estimates the temperature of a position where a temperature sensor is not arranged by interpolation through the fusion temperature matrix to generate a complete temperature distribution map;

[0101] A temperature judgment unit, which compares the temperature of a key part in the temperature distribution diagram and the calculated temperature gradient with a set temperature threshold and temperature gradient;

[0102] A fault identification unit, based on the comparison result of the temperature judgment unit, identifies the potential fault area and fault type;

[0103] Alarm unit, when abnormal temperature or temperature gradient is detected, the system automatically triggers the alarm.

[0104] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art can still improve the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification or equivalent replacement made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An intelligent temperature measurement method based on temperature matrix, characterized in that: include: Step 1, temperature sensor arrangement; three temperature sensors are arranged at the front, middle and rear of each component to be monitored in the switch cabinet, and the measurement accuracy of the middle temperature sensor is better than the measurement accuracy of the front temperature sensor and the rear temperature sensor; Step 2, temperature data collection and storage; three temperature sensors arranged on each of the components to be monitored collect temperature data of each component to be monitored in the switch cabinet at a certain sampling period, and record the temperature value at each time point, and form three temperature matrices according to the position relationship of the sensors; Step 3, calculating the fusion weight factors of the three temperature matrices according to the historical change trends of the three temperature matrices and the sensor measurement accuracy; The historical trend matrix of the front, middle and rear temperature sensors is obtained by calculation: ΔT f (t) = T f (t)-T f (t'), ΔT m (t) = T m (t)-T m (t'), ΔT b (t) = T b (t)-T b (t'); where ΔT f (t) is the historical trend matrix of the front temperature sensor, ΔT m (t) is the historical trend matrix of the middle temperature sensor, ΔT b (t) is the historical trend matrix of the rear temperature sensor, T f (t) is the front temperature matrix at time t, T f (t') is the front temperature matrix at the previous moment t' before moment t, T m (t) is the middle temperature matrix at time t, T m (t') is the middle temperature matrix at the previous moment t' before moment t, T b (t) is the rear temperature matrix at time t, T b (t') is the rear temperature matrix at the previous moment t' before moment t; the mean values ​​of the historical trend matrices of the front, middle and rear temperature sensors are respectively: and Where ΔT f,i (t), ΔT m,i (t) and ΔT b,i (t) are the historical trend matrix of the front temperature sensor ΔT m (t), historical trend matrix of middle temperature sensor ΔT m (t) and the rear temperature sensor historical trend matrix ΔT b (t), n is the number of elements of the historical trend matrix of the front, middle and rear temperature sensors; the calculation formulas of the front temperature matrix fusion weight factor α, the middle temperature matrix fusion weight factor β and the rear temperature matrix fusion weight factor γ are as follows: Among them, E f 、E m and E b The measurement accuracy of the front, middle and rear temperature sensors respectively; Step 4: Calculate the fusion temperature matrix T according to the fusion weight factors of the above three temperature matrices fused (t) = α × T f (t)+β×T m (t)+γ×T b (t); Step 5, estimating the temperature of the position where the temperature sensor is not arranged by interpolation through the fused temperature matrix, and generating a complete temperature distribution map; Step 6, setting a temperature threshold according to the normal operating temperature range of different components to be monitored; Step 7, calculating the temperature gradient; Step 8, fault identification: based on the temperature threshold and temperature gradient, identify potential fault areas and fault types; Step 9, alarm mechanism; when abnormal temperature or temperature gradient is detected, the system automatically triggers an alarm.

2. A temperature measurement method according to claim 1, characterized in that: All of the front temperature sensors are approximately located in the same plane, all of the middle temperature sensors are approximately located in the same plane, and all of the rear temperature sensors are approximately located in the same plane.

3. A temperature measurement method according to claim 1, characterized in that: In step 5, the position coordinates and temperature values ​​of the four adjacent temperature points in the fusion temperature matrix are respectively: [(x1, y1), T 11 ]、[(x2,y1),T 21 ]、[(x1,y2),T 12 ] and [(x2,y2),T 22 ]; the position coordinates and temperature points that need to be interpolated are [(x,y), T(x,y)], and the interpolation calculation formula is:

4. A temperature measurement method as claimed in claim 3, characterized in that: The temperature history trend factors ω1, ω2, ω3 and ω4 are introduced into the interpolation calculation formula, and the current fusion temperature matrix T fused (t) and T at the previous moment t' fused (t′) is subtracted to obtain the temperature change of the fusion temperature matrix; let T 11 、T 21 、T 12 、T 22 The corresponding temperature changes are ΔT 11 , ΔT 21 , ΔT 12 , ΔT 22 , then the temperature historical trend factors ω1, ω2, ω3 and ω4 are expressed as: Among them, C is the balance coefficient, and the balance coefficient C is a constant.

5. The temperature measurement method according to any one of claims 1 to 4, characterized in that: The temperature sensor is selected from at least two of RTD, thermocouple, NTC and semiconductor temperature sensor.

6. The temperature measurement method according to any one of claims 1 to 4, characterized in that: The alarm mechanisms include: Real-time alarm: The system notifies maintenance personnel through sound and light alarms, text messages, and emails; Record logs: record abnormal temperature points and times in the system log for subsequent analysis; Generate report: Generate temperature monitoring report regularly, including fault point, time and temperature value.

7. An intelligent temperature measurement device using the intelligent temperature measurement method based on temperature matrix as described in claim 1, characterized in that: include: A plurality of temperature sensors, wherein three temperature sensors are arranged on each component to be monitored in the switch cabinet, and the measurement accuracy of the three temperature sensors is not all the same; The temperature collection and storage unit collects the temperature data of each component to be monitored in the switch cabinet at a certain sampling period from the three temperature sensors arranged on each component to be monitored, and records the temperature value at each time point, and forms three temperature matrices according to the position relationship of the sensors; A data processing unit, which calculates the fusion weight factors of the three temperature matrices according to the historical change trends of the three temperature matrices and the sensor measurement accuracy; A fusion temperature matrix is ​​calculated using a fusion weight factor; the temperature of a location where a temperature sensor is not arranged is estimated by interpolation of the fusion temperature matrix to generate a complete temperature distribution map; A temperature judgment unit, which compares the temperature of a key part in the temperature distribution diagram and the calculated temperature gradient with a set temperature threshold and temperature gradient; A fault identification unit, based on the comparison result of the temperature judgment unit, identifies the potential fault area and fault type; Alarm unit, when abnormal temperature or temperature gradient is detected, the system automatically triggers the alarm.

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