Cable joint temperature indicating device based on electronic wax sheet color code reproduction

Abstract

The invention relates to the technical field of high-voltage electrical equipment monitoring, and discloses a cable joint temperature indicating device based on electronic wax sheet color code reproduction, and the device comprises a temperature measuring plate, one side of which is connected with a temperature sensor, and the temperature measuring plate is used for receiving a resistance signal generated during the temperature measurement of the temperature sensor; the IC module is used for converting the resistance signal into a digital temperature signal; the processing module is used for converting the digital temperature signals into driving parameters, the IC module drives the light emitting unit to emit light after receiving the driving parameters, and the light is transmitted to the prism film through the light guide column to be displayed. The temperature sensor, the IC module and the processing module are adopted to replace a chemical reaction of a traditional temperature measurement wax sheet, so that the detection time is shortened, meanwhile, linear mapping can be carried out on a specific temperature interval and continuous hue values, early warning is carried out for operation and maintenance personnel, and the working efficiency is improved. And information lag and safety misjudgment caused by response delay and color step change of a traditional wax sheet are effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage electrical equipment monitoring, in particular to a cable joint temperature indicating device based on electronic wax sheet color code reproduction. Background Art

[0002] Cable joints in power systems are critical nodes in the transmission network and a frequent source of failure. Due to factors such as contact resistance and insulation aging, cable joints are prone to overheating over long periods of operation. If not detected and addressed promptly, these overheating can lead to insulation breakdown, short circuits, and even fires, posing a serious threat to the safe and stable operation of the power grid. Therefore, real-time and accurate monitoring of cable joint temperature is crucial.

[0003] Currently, a traditional temperature measurement method widely used in field operations and maintenance is adhesive wax temperature measuring strips (also known as temperature-sensing stickers). These products use the principle that specific chemical materials undergo an irreversible color change when a preset temperature threshold is reached to indicate the temperature. However, this existing temperature measurement method has the following significant drawbacks: Delayed response and lack of early warning: Temperature-measuring wax strips rely on chemical reactions or physical phase transitions, resulting in a slow response and inability to reflect instantaneous temperature changes in real time. More importantly, their color changes are typically step-like, such as from green to yellow at 70°C and red at 90°C. This discontinuous color change only informs maintenance personnel that the temperature has reached a certain threshold, but fails to provide continuous trend information from one threshold to the next. This lack of early warning capability can cause maintenance personnel to miss optimal action opportunities, leading to information lags and potential safety misjudgments.

[0004] Poor color consistency and single-use: Traditional temperature wax sheets rely on chemical substances for color display, which can lead to color variations between batches, affecting accuracy. Furthermore, the color change process is often irreversible; once the temperature drops, the color cannot be restored. As a single-use consumable, this increases operational costs and makes them unsuitable for scenarios requiring repeated monitoring.

[0005] Limited viewing conditions and poor adaptability: Traditional temperature wax strips are passive displays, completely dependent on ambient lighting. They typically require operators to observe from a close distance and at a correct angle. In low light conditions or at poor viewing angles, missed detections or misreadings are highly likely. Furthermore, for cable connectors installed outdoors, their inherent display characteristics cannot adapt to varying lighting conditions, such as bright daylight or dark nighttime. This makes them difficult to identify in certain conditions, significantly limiting their applicability and reliability in complex lighting environments. Summary of the Invention

[0006] In response to the shortcomings of the existing technology, the present invention provides a cable joint temperature indicator device based on electronic wax sheet color reproduction, which solves the problems of traditional temperature measuring wax sheets such as delayed response, color step changes without early warning, poor color consistency, one-time use and limited observation conditions.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a cable joint temperature indicating device based on electronic wax sheet color reproduction, comprising: A temperature measuring plate, one side of which is connected to a temperature sensor, and the temperature measuring plate is used to receive a resistance signal generated by the temperature sensor during temperature measurement; An IC module is mounted on the temperature measuring board and is used to convert the resistance signal into a digital temperature signal; The processing module is installed on the temperature measuring board and connected to the IC module. It is used to convert the digital temperature signal into a driving parameter. After receiving the driving parameter, the IC module drives the light-emitting unit to emit light, and the light emitted by the light-emitting unit is transmitted to the prism film display through the light guide column.

[0008] Preferably, the light-emitting unit is connected to the temperature measuring plate, and the light-emitting unit includes a multi-color LED lamp, and an optical coupling glue is provided between the multi-color LED lamp and the light guide column.

[0009] Preferably, the light guide column and the prism film are bonded by UV curing, the prism film is connected to the housing, a diamond grid is provided inside the prism film, and the spacing between two adjacent diamond grids is 100 μm±5%.

[0010] Preferably, the device further comprises a compensation module, which is mounted on the temperature measuring board and connected to the processing module.

[0011] Preferably, the processing module includes an electronic wax sheet color code engine, and the electronic wax sheet color code engine is used to generate theoretical color parameters representing theoretical colors according to the temperature information.

[0012] Preferably, the electronic wax color code engine further includes a color difference compensation unit, which is used to correct the theoretical color parameters to generate the driving parameters so that the color finally emitted by the light emitting unit has a color difference of 0.01% from the preset standard color card. .

[0013] Preferably, the compensation module is used to obtain ambient light intensity information; and the processing module adjusts the driving parameters according to the ambient light intensity information obtained by the compensation module to change the display brightness of the light-emitting unit.

[0014] Preferably, the temperature sensor is a three-wire platinum resistance temperature sensor.

[0015] Preferably, an analog-to-digital converter is provided inside the IC module for converting the resistance signal into the digital temperature signal.

[0016] Preferably, the electronic wax sheet color code engine is used to map the temperature range of 70°C to 90°C to the hue value range of 120° to 0° in the HSV color space to generate the theoretical color parameters.

[0017] The present invention provides a cable joint temperature indicator device based on electronic wax sheet color reproduction. It has the following beneficial effects: 1. The present invention replaces the chemical reaction of traditional temperature measuring wax sheets with temperature sensors, IC modules and processing modules, thereby shortening the detection time. In addition, the electronic wax sheet color code engine can linearly map specific temperature ranges to continuous hue values, providing early warnings for operation and maintenance personnel, effectively avoiding the information lag and safety misjudgment caused by the response delay and color step changes of traditional wax sheets.

[0018] 2. The present invention uses an electronic wax color code engine and a color difference compensation unit to reproduce the industrial safety color spectrum with high fidelity. The color difference compensation unit can reduce the deviation between the final displayed color and the standard color card and display it on the prism film. Therefore, the present invention is reusable and responsive, while continuing the color recognition habits of operation and maintenance personnel, reducing learning costs and the risk of misoperation, and also improving the accuracy and safety of judgment.

[0019] 3. The present invention guides light to the prism film through a light guide column, and the prism film can expand the display viewing angle to more than 120° to meet the needs of multi-angle inspection. The compensation module monitors the ambient light intensity in real time, and the processing module automatically adjusts the display brightness of the light-emitting unit, thereby ensuring that the device is clearly visible under strong outdoor light and soft and not dazzling at night or in dim indoor light, greatly improving the product's applicability and indication reliability under various complex lighting conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 Schematic diagram of the internal structure of the housing of the present invention; Figure 3 This is a partial structural diagram of the temperature measuring plate of the present invention; Figure 4 for Figure 2 A magnified view of point A in the figure; Figure 5 Schematic diagram of the system architecture of the present invention.

[0021] Among them, 1. Shell; 2. Temperature measuring board; 3. Temperature sensor; 4. IC module; 5. Processing module; 6. Compensation module; 7. Light-emitting unit; 8. Light guide column; 9. Prism film; 10. Optical coupling glue. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the specification of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] In order to better understand the present invention, the above contents are described in detail below in conjunction with specific embodiments.

[0024] Example 1, please refer to the attached Figure 1 -Attached Figure 5 An embodiment of the present invention provides a cable joint temperature indicating device based on electronic wax color code reproduction, including: a temperature measuring plate 2, one side of which is connected to a temperature sensor 3, and the temperature measuring plate 2 is used to receive a resistance signal generated by the temperature sensor 3 during temperature measurement; an IC module 4, which is installed on the temperature measuring plate 2 and is used to convert the resistance signal into a digital temperature signal; a processing module 5, which is installed on the temperature measuring plate 2 and connected to the IC module 4, and is used to convert the digital temperature signal into a driving parameter. After receiving the driving parameter, the IC module 4 drives the light-emitting unit 7 to emit light, and the light emitted by the light-emitting unit 7 is transmitted to the prism film 9 through the light guide column 8 for display.

[0025] In this embodiment, the temperature measuring plate 2 is used to receive the resistance signal generated by the temperature sensor 3 due to temperature changes, and then the resistance signal is transmitted to the IC module 4. At this time, the IC module 4 converts the resistance signal into a digital temperature signal through its internal analog-to-digital converter, and finally transmits the digital temperature signal to the processing module 5. At this time, the electronic wax color code engine is run inside the processing module 5, and according to the digital temperature signal, a theoretical color parameter is generated through a color mapping algorithm (for example, mapping 70°C-90°C to a hue value of 120°-0°); then the color parameter is corrected according to a preset lookup table by the color difference compensation unit to ensure the accuracy of the color difference finally displayed, and then the double-compensated color parameter is sent to the IC module 4. At this time, the IC module 4 drives the light-emitting unit 7 (multi-color LED lamp) to emit mixed light according to the double-compensated color parameter, and then transmits it to the prism film 9 through the light guide column 8 for display.

[0026] The light-emitting unit 7 is connected to the temperature measuring plate 2 and includes a multi-color LED lamp. An optical coupling adhesive 10 is provided between the multi-color LED lamp and the light guide 8. The light guide 8 is bonded to the prism film 9 via UV curing. The prism film 9 is connected to the housing 1 and has a diamond-shaped grid inside. The spacing between adjacent diamond grids is 100 μm ± 5%.

[0027] In this embodiment, by connecting the light-emitting unit 7 containing a multi-color LED lamp to the temperature measuring plate 2 and filling the optical coupling glue 10 between the multi-color LED lamp and the light guide column 8, the reflection loss of light at the output interface can be reduced, thereby improving the light energy utilization rate and the final display brightness; at the same time, the light guide column 8 and the prism film 9 are connected and fixed by using UV curing bonding, and a diamond grid is provided inside the prism film 9, so that after the light is output from the light guide column 8, the diamond grid structure can be used to refract and diffuse the light in multiple directions, thereby displaying the color with a wide viewing angle.

[0028] The device also includes a compensation module 6, which is mounted on the temperature measuring board 2 and connected to the processing module 5. The compensation module 6 is used to obtain ambient light intensity information; the processing module 5 adjusts the driving parameters based on the ambient light intensity information obtained by the compensation module 6 to change the display brightness of the light-emitting unit 7.

[0029] In this embodiment, the compensation module 6 (for example, a TSL2561 sensor) monitors the light intensity information of the environment in which the device is located in real time and sends the ambient light information to the processing module 5. At this time, the processing module 5 dynamically adjusts the driving parameters based on the received information, thereby increasing or reducing the brightness of the light-emitting unit 7.

[0030] The processing module 5 includes an electronic wax color code engine, which is used to generate theoretical color parameters representing theoretical colors based on temperature information. The electronic wax color code engine also includes a color difference compensation unit, which is used to correct the theoretical color parameters to generate driving parameters so that the color finally emitted by the light-emitting unit 7 has a color difference of 0.01% from the preset standard color card. The electronic wax color code engine is used to map the temperature range of 70°C to 90°C to the hue value range of 120° to 0° in the HSV color space to generate theoretical color parameters.

[0031] In this embodiment, an electronic wax color code engine is integrated into the processing module 5. The engine first executes a preset color mapping algorithm to map a key temperature range (e.g., 70°C to 90°C) to hue values ​​from 120° (green) to 0° (red) in the HSV color space, thereby generating theoretical color parameters representing the theoretical color. Subsequently, the above theoretical color parameters are corrected twice by the color difference compensation unit to generate the final driving parameters. This can effectively compensate for the inherent hardware deviation of the light-emitting unit 7 and control the color difference between the final displayed color and the standard industrial color card within an ideal range (for example, ≤3). In this way, while achieving intuitive visualization of temperature information, the traditional safety color spectrum familiar to operation and maintenance personnel is reproduced with high fidelity, ensuring the accuracy and continuity of judgment.

[0032] The temperature sensor 3 is a three-wire platinum resistance temperature sensor 3. An analog-to-digital converter is provided inside the IC module 4 for converting the resistance signal into a digital temperature signal.

[0033] In this embodiment, a three-wire platinum resistance temperature sensor 3 is used as the front-end temperature sensor 3, and an analog-to-digital converter is integrated inside the IC module 4. This can effectively compensate for the inherent error caused by the wire resistance in the physical connection; and the high-precision analog-to-digital converter converts the analog signal into a digital temperature signal, thereby improving the accuracy and reliability of signal acquisition, thereby improving the accuracy of detection.

[0034] Working Principle: To use, first move the device so that temperature sensor 3 contacts the surface of the object to be measured (such as a cable connector). At this point, the heat of the object to be measured is transferred to the temperature measuring plate 2 by heat conduction. Since temperature sensor 3 is preferably a high-precision three-wire platinum resistance temperature sensor (such as a PT1000 model), the resistance value of the platinum metal inside it changes with increasing temperature, thereby generating a resistance signal directly corresponding to the current temperature. Subsequently, the IC module 4 starts working, collecting the resistance signal generated by the three-wire platinum resistance temperature sensor 3 through its internal analog-to-digital converter. At this time, the IC module 4 can compensate for the resistance error of the connecting wire itself before conversion to ensure the accuracy of the measurement. Then, the analog-to-digital converter converts the resistance signal into a digital temperature signal. Subsequently, the digital temperature signal is transmitted to the processing module 5 (e.g., an MCU). At this time, the electronic wax color code engine in the processing module 5 executes a color mapping algorithm based on the received digital temperature signal. Specifically, a preset key temperature range, such as 70°C to 90°C, is linearly or nonlinearly mapped to a hue value range of 120° (green) to 0° (red) in the HSV (hue, saturation, value) color space, thereby generating a theoretical color parameter representing the color theoretically corresponding to the current temperature. At the same time, the color difference compensation unit in the electronic wax color code engine corrects the theoretical color parameters (the correction basis can be a lookup table generated by calibration with a professional colorimeter before leaving the factory). This can compensate for the color deviation caused by individual differences in LEDs and generate a set of parameters that ensure the final color difference is less than or equal to 3 ( ) precise driving parameters (for example: PWM duty cycle values ​​of RGB colors); At the same time, in order to adapt to changes in the external environment, the compensation module 6 can monitor the ambient light intensity in real time and send the acquired ambient light intensity information to the processing module 5. The processing module 5 will then dynamically adjust the newly generated driving parameters based on the ambient light intensity information, mainly adjusting the brightness component of the color parameters. Finally, the final driving parameters after double compensation (color difference compensation and ambient light compensation) are sent back to the IC module 4 by the processing module 5. Then, the IC module 4 drives the light-emitting unit 7 (multi-color LED lamp) to emit mixed light according to the parameters. The light then passes through the optical coupling glue 10 and enters the light guide 8. Then, the light guide 8 enters the prism film 9. At this time, the prism film 9 can refract and diffuse the light emitted from the end of the light guide column 8 in multiple directions through the diamond grid inside it, thereby forming a color with a wide viewing angle displayed on the prism film 9. The operation and maintenance personnel can then judge the real-time temperature status of the cable connector by observing this color.

[0035] Example 2, based on the above Example 1: In this embodiment: In order to eliminate the influence of the connection wire resistance on the measurement results, the temperature sensor 3 of this embodiment adopts a three-wire platinum resistance temperature sensor (PT1000); Specifically, let the real-time resistance of PT1000 be The resistances of the three connecting wires are , and , and the material length is the same, that is , and the constant current source inside IC module 4 provides a constant current of The excitation current, The process of eliminating lead resistance includes the following steps: In the first measurement phase, the constant current source The platinum resistance is through the wire 1 and the wire 2 The analog-to-digital converter inside IC module 4 measures the total voltage at the far end of wire 1 and wire 2. The calculation formula is: ; In the second measurement phase, the analog switch inside the IC module 4 is closed, and the analog-to-digital converter measures the voltage between the wire 2 and the wire 3. The measured current flows through wire 2, but no current flows through wire 3, so the voltage measured at this time is the voltage drop of a single lead. The calculation formula is: ; Through the above two measured values, the processing module 5 calculates the pure resistance value of the platinum resistor The calculation formula is: ; Then, the analog-to-digital converter inside IC module 4 calculates the pure resistance value Convert to high-resolution digital And transmit it to the processing module 5.

[0036] The processing module 5 is a central processing unit (MCU), which 2 The C bus is connected to the ambient light sensor (TSL2561) of the compensation module 6. At this time, the processing module 5 is used to execute the color generation and compensation algorithm.

[0037] The algorithm includes a temperature-hue mapping step. This step takes the temperature value Mapped to hue value in HSV color space The mapping relationship is calculated by linear interpolation, and the formula is as follows: ; Where, is the hue value corresponding to the current temperature; is the starting value of the hue value range, set to 120°; is the end value of the hue value range, set to 0°; The currently measured temperature; The lower limit of the temperature indication range is set to 70°C; is the upper limit of the temperature indication range, which is set to 90° C. In this step, the saturation (S) value of the HSV color space is set to a constant value of 100%.

[0038] The algorithm also includes an ambient light-brightness compensation step. This step is based on the ambient light intensity. Dynamically adjust the brightness value in HSV color space Assume that the ambient light intensity obtained by the processing module 5 from the ambient light sensor is (Unit: Lux), the preset response light range is to , the corresponding brightness output range is to .when When the brightness value Calculated by piecewise linear mapping, the formula is as follows: ; Where, is the brightness value corresponding to the current light; The lower limit of brightness output; The upper limit of brightness output; is the currently measured ambient light intensity; To respond to the lower limit of the illumination range, it is set to 50 Lux; To correspond to the upper limit of the illumination range, it is set to 10000 Lux.

[0039] when hour, ; when hour, .

[0040] The algorithm also includes a PWM parameter generation step. Processing module 5 converts the calculated triplet into the color components of the three primary colors red (R), green (G), and blue (B) using the HSV to RGB algorithm. Subsequently, the RGB values ​​in the range of 0-255 are converted into the duty cycle parameters of the pulse width modulation (PWM) signal with a 12-bit resolution. , , The calculation formula is as follows: ; ; ; Where, , , These are the PWM duty cycle parameters corresponding to the three colors R, G, and B; , , is the corresponding color component value.

[0041] The algorithm also includes a color difference compensation step. In order to control the color difference between the final display color and the standard color card within the target range ( ), this compensation step is introduced.

[0042] This step is performed by the compensation function stored in the non-volatile memory of the processing module 5 Implementation: This function exists in the form of a lookup table (LUT) or correction function, and its data is generated during the production calibration process.

[0043] Assume the theoretical PWM parameters are , then the final PWM parameters after compensation are The calculation formula is as follows: ; in, is the final output PWM parameter, is the compensation function, is the theoretical PWM parameter. The final PWM parameter The signal is sent to the IC module 4 to drive the light emitting unit 7 .

Claims

1. A cable joint temperature indicating device based on electronic wax sheet color reproduction, characterized in that: include: A temperature measuring plate (2), one side of which is connected to a temperature sensor (3), and the temperature measuring plate (2) is used to receive a resistance signal generated by the temperature sensor (3) during temperature measurement; An IC module (4) mounted on the temperature measuring board (2) for converting the resistance signal into a digital temperature signal; The processing module (5) is mounted on the temperature measuring plate (2) and connected to the IC module (4), and is used to convert the digital temperature signal into a driving parameter. After receiving the driving parameter, the IC module (4) drives the light-emitting unit (7) to emit light, and the light emitted by the light-emitting unit (7) is transmitted to the prism film (9) for display via the light guide column (8).

2. A cable joint temperature indicating device based on electronic wax sheet color reproduction according to claim 1, characterized in that: The light-emitting unit (7) is connected to the temperature measuring plate (2), and the light-emitting unit (7) includes a multi-color LED lamp. An optical coupling glue (10) is provided between the multi-color LED lamp and the light guide column (8).

3. A cable joint temperature indicating device based on electronic wax sheet color reproduction according to claim 1, characterized in that: The light guide column (8) and the prism film (9) are bonded by UV curing, the prism film (9) is connected to the housing (1), a diamond grid is provided inside the prism film (9), and the spacing between two adjacent diamond grids is 100 μm ± 5%.

4. A cable joint temperature indicating device based on electronic wax sheet color reproduction according to claim 1, characterized in that: The device further comprises a compensation module (6), which is mounted on the temperature measuring plate (2) and connected to the processing module (5).

5. The cable joint temperature indicating device based on electronic wax sheet color reproduction according to claim 1, characterized in that: The processing module (5) comprises an electronic wax sheet color code engine, and the electronic wax sheet color code engine is used to generate theoretical color parameters representing theoretical colors according to the temperature information.

6. A cable joint temperature indicating device based on electronic wax sheet color reproduction according to claim 5, characterized in that: The electronic wax color code engine also includes a color difference compensation unit, which is used to correct the theoretical color parameters to generate the driving parameters so that the color finally emitted by the light-emitting unit (7) has a color difference with the preset standard color card. .

7. A cable joint temperature indicating device based on electronic wax sheet color reproduction according to claim 4, characterized in that: The compensation module (6) is used to obtain ambient light intensity information; the processing module (5) adjusts the driving parameters according to the ambient light intensity information obtained by the compensation module (6) to change the display brightness of the light-emitting unit (7).

8. The cable joint temperature indicating device based on electronic wax sheet color reproduction according to claim 1, characterized in that: The temperature sensor (3) is a three-wire platinum resistance temperature sensor.

9. The cable joint temperature indicating device based on electronic wax sheet color reproduction according to claim 1, characterized in that: An analog-to-digital converter is provided inside the IC module (4) for converting the resistance signal into the digital temperature signal.

10. The cable joint temperature indicating device based on electronic wax sheet color reproduction according to claim 5, characterized in that: The electronic wax color code engine is used to map the temperature range of 70° C. to 90° C. to the hue value range of 120° to 0° in the HSV color space to generate the theoretical color parameters.

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