A wireless temperature measuring device for hydraulic tension clamp of liquid metal power generation

Abstract

The present invention is a wireless temperature measuring device for a hydraulic tension clamp of liquid metal power generation, comprising a protective shell, a data acquisition module, a communication module, a data processing module, a power supply module and a liquid metal power generation module; the protective shell is fixed to the hydraulic tension clamp of the transmission line through a heat-conducting mounting aluminum plate; the data acquisition module is wired to the data processing module; the data processing module is connected to the communication module circuit board; the communication module transmits wireless information to the background server through a repeater. In the present invention, when the hydraulic tension clamp of the transmission line is heated, the temperature sensor on the heat-conducting mounting aluminum plate transmits the collected temperature data of the hydraulic tension clamp to the temperature measurement processor for processing. After the data processing is completed, the communication module transmits the temperature data to the background server through a repeater. The power supply of the present invention adopts a battery plus liquid metal temperature difference power generation hybrid mode. By transmitting the collected information, labor costs are saved and the temperature measurement accuracy and efficiency are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of online temperature monitoring of power transmission lines, and in particular relates to a wireless temperature measuring device for a hydraulic tension clamp of liquid metal power generation. Background Art

[0002] Thermal defects in electrical equipment of overhead transmission lines account for more than 50% of electrical defects. Once a transmission line fails, it often leads to serious consequences such as "one point broken, one line stopped, and a whole area dark", which seriously threatens the safe operation of overhead transmission lines and power grids.

[0003] In order to timely discover and eliminate heating defects of line equipment, the traditional operation and maintenance method is that the inspection personnel must go to the site to use infrared thermal imagers to conduct thermal imaging analysis of the electrical parts of the overhead transmission line in order to obtain reliable and true data, especially during the peak summer period, when electricity consumption rises sharply and the line load is generally heavy, which is also the peak period for transmission line heating. At this time every year, a large number of line operation and maintenance personnel are required to carry special infrared temperature measurement equipment and go to the site to measure over mountains and ridges in order to grasp the operation status of the line in a timely manner. This traditional line operation and maintenance method cannot obtain the line operation parameters in the first time, which not only consumes a lot of manpower, material resources and financial resources, but also the line operation and maintenance personnel face a lot of safety risks, such as heat stroke, traffic accidents, drowning, animal injuries, etc. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a wireless temperature measuring device for a hydraulic tension clamp of liquid metal power generation.

[0005] The technical solution adopted by the present invention is:

[0006] A wireless temperature measuring device for a hydraulic tension clamp of liquid metal power generation, comprising a protective shell, a data acquisition module, a communication module, a data processing module, a power supply module and a liquid metal power generation module; the protective shell is a hollow shell structure, a heat-conducting mounting aluminum plate is provided at the bottom, and is fixed to the hydraulic tension clamp of the transmission line through the heat-conducting mounting aluminum plate; the data acquisition module is a temperature sensor, the temperature sensor is located between the protective shell and the heat-conducting mounting aluminum plate, and is connected to the data processing module by wire; the data processing The module is a temperature measurement processor, which is arranged inside the protective shell and connected to the communication module circuit board; the communication module is arranged inside the protective shell and connected to the repeater, and wirelessly transmits information with the background server through the repeater; the power supply module consists of a lithium battery pack, which is arranged inside the protective shell and supplies power to the temperature sensor, temperature measurement processor, communication module and repeater respectively; the liquid metal power generation module is located outside the protective shell and between the protective shell and the heat-conducting mounting aluminum plate, and is wired to the lithium battery pack, and generates current through the potential formed by the temperature difference of the liquid metal to provide power for the lithium battery pack.

[0007] Furthermore, the liquid metal power generation module is composed of a thermoelectric power generation sheet, a cold end heat sink and liquid metal. The thermoelectric power generation sheet is located between the protective shell and the heat-conducting mounting aluminum plate, and liquid metal is provided on the upper and lower surfaces thereof respectively; the cold end heat sink is installed outside the protective shell, and there is a temperature difference between the cold end heat sink and the liquid metal, and an electric potential is formed through the liquid metal thermoelectric power generation sheet to generate current.

[0008] Furthermore, a heat insulating sealing pad is provided between the protective shell and the heat conducting mounting aluminum plate.

[0009] Furthermore, a detachable top cover is provided on the top of the protective shell.

[0010] Furthermore, a waterproof pad is provided between the top cover and the protective shell.

[0011] Further, the data processing module includes, in addition to the temperature measurement processor, a temperature measurement processor including a DSP data acquisition card, a Chebyshev filter and an AD converter;

[0012] Based on the above device, the data processing module performs the following steps on the collected temperature values ​​of the hydraulic tension clamp:

[0013] Step 1 Data acquisition: The temperature sensor data is collected through the DSP data acquisition card, and the collected data is sent to the temperature measurement processor for subsequent analysis. The data sampling frequency is 5000hz;

[0014] Step 2 Preprocessing: The data collected by the temperature sensor first passes through a Chebyshev filter to filter out the noise in the temperature data, passes through a DSP data collector, and then passes through an AD converter to convert the analog signal into a digital signal for subsequent processing;

[0015] Step 3 Data encryption: The temperature data is encrypted using the RSA encryption algorithm;

[0016] Step 4 Check code: The temperature data uses a parity check algorithm. During data storage and transmission, an extra bit is added to the byte to detect errors. The check bit can be calculated by XORing the data bit.

[0017] Furthermore, the RSA algorithm involves three parameters: n, e1, and e2; wherein n is the product of two large prime numbers p and q, and the number of bits occupied when n is represented in binary, i.e., the key length; e1 and e2 are a pair of related values; e1 can be arbitrarily selected, but it is required that e1 and (p-1)*(q-1) are mutually prime; then e2 is selected, and it is required that (e2*e1)mod((p-1)*(q-1))=1; (n and e1), (n and e2) are a key pair; the RSA encryption and decryption algorithms are exactly the same, assuming A is plain text and B is cipher text, then: A=B^e1mod n; B=A^e2mod n; e1 and e2 can be used interchangeably, i.e.: A=B^e2 mod n; B=A^e1 mod n.

[0018] The beneficial effects of the present invention are:

[0019] 1. In the present invention, when the hydraulic tension clamp of the power transmission line generates heat, the temperature sensor installed on the heat-conducting aluminum plate transmits the collected temperature data of the hydraulic tension clamp to the temperature measurement processor for processing. After the data processing is completed, the communication module transmits the temperature data to the background server through the repeater, which saves labor costs and improves the temperature measurement accuracy. At the same time, it has the communication function to transmit the collected information.

[0020] 2. The present invention adopts a battery plus liquid metal temperature difference power generation hybrid mode. When heat is generated at the hydraulic tension clamp of the transmission line, the heat-conducting mounting aluminum plate connected thereto transfers heat energy to the liquid metal, causing a temperature difference between the liquid metal and the cold end heat sink, thereby forming an electric potential through the temperature difference power generation sheet to generate current input into the capacitor for storage and power supply.

[0021] 3. The present invention can automatically collect real-time temperature data of the hydraulic tension clamp of the transmission line, saving labor costs and improving the temperature measurement accuracy and effectiveness; it can effectively solve the problems of high labor intensity and low temperature measurement accuracy in manual measurement, and realize real-time online temperature measurement. It is easy to install, simple to operate, safe and reliable, has a long service life, and is maintenance-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 and Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0024] Figure 4 It is a data processing flow chart of the data processing module of the present invention;

[0025] Figure 1 —3, 1—protective shell, 2—thermal conductive mounting aluminum plate, 3—temperature sensor, 4—temperature measurement processor, 5—communication module, 6—lithium battery pack, 7—temperature difference power generation sheet, 8—cold end heat sink, 9—liquid metal, 10—insulating sealing pad, 11—top cover, 12—waterproof pad. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1-3 As shown, the present invention is a wireless temperature measuring device for a hydraulic tension clamp for liquid metal power generation, which includes a protective shell 1, a data acquisition module, a communication module 5, a data processing module, a power supply module and a liquid metal power generation module.

[0028] The protective shell 1 is a hollow shell structure, and a heat-conducting mounting aluminum plate 2 is provided at the bottom of the protective shell 1, and is fixed to the hydraulic tension clamp of the power transmission line through the heat-conducting mounting aluminum plate 2. In order to ensure the stability of the working performance of the modules inside the protective shell 1 and prevent the temperature inside the protective shell 1 from being too high, an insulating sealing pad 10 is also provided between the protective shell 1 and the heat-conducting mounting aluminum plate 2. In order to facilitate the maintenance of the modules inside the protective shell 1, a detachable top cover 11 is also provided on the top of the protective shell 1, and a waterproof pad 12 is also provided between the top cover 11 and the protective shell 1.

[0029] The data acquisition module is a temperature sensor 3, the working environment temperature of the temperature sensor 3 is: -40°C to +90°C, the measuring range is: -55°C to +120°C, and the working cycle is: 1min (overtemperature), 15min (alarm), 30min (normal); the temperature sensor 3 is located between the protective shell 1 and the heat-conducting mounting aluminum plate 2, and the temperature sensor 3 indirectly collects the temperature at the hydraulic tension clamp of the transmission line through the heat-conducting mounting aluminum plate 2. The temperature sensor 3 is connected to the data processing module by wire to transmit the collected data to the data processing module for processing.

[0030] The data processing module is a temperature measurement processor 4, which is arranged inside the protective shell 1, and the temperature measurement processor 4 is connected to the circuit board of the communication module 5. The communication module 5 is arranged inside the protective shell 1, and the communication module 5 is connected to the repeater, and the communication module 5 transmits wireless information with the background server through the repeater. The structural design shell of the repeater is made of aluminum alloy or stainless steel material, and can work normally in a high-voltage electric field environment of 110kV-500kV. The power supply module is composed of a lithium battery pack 6, which is arranged inside the protective shell 1, and the lithium battery pack 6 is respectively used to power the temperature sensor 3, the temperature measurement processor 4, the communication module 5 and the repeater.

[0031] The working principle of the wireless temperature measuring device of the hydraulic tension clamp for liquid metal power generation:

[0032] When the hydraulic tension clamp of the transmission line heats up, the heat-conducting mounting aluminum plate 2 connected thereto transfers the heat energy to the liquid metal power generation module and the temperature sensor 3. The temperature value of the hydraulic tension clamp collected by the temperature sensor 3 is transmitted to the temperature measurement processor 4, which processes it into a digital signal. Then, the temperature data is transmitted to the background server by the repeater through the communication module 5.

[0033] On the basis of the above technical solution, the liquid metal power generation hydraulic tension clamp wireless temperature measuring device adopts a battery + liquid metal temperature difference power generation hybrid mode. The liquid metal power generation module is located outside the protective shell 1 and between the protective shell 1 and the heat-conducting mounting aluminum plate 2. The liquid metal power generation module is wired to the lithium battery pack 6, and the temperature difference forms an electric potential to generate current to provide power for the lithium battery pack 6.

[0034] Specifically, the liquid metal power generation module is composed of a thermoelectric power generation sheet 7, a cold end heat sink 8 and liquid metal 9. The heat transfer medium at the cold and hot ends is liquid metal 9. The thermoelectric power generation sheet 7 is located between the protective housing 1 and the heat-conducting mounting aluminum plate 2. Liquid metal 9 is provided on the upper and lower surfaces of the thermoelectric power generation sheet 7. The cold end heat sink 8 is installed outside the protective housing 1 as the cold end. There is a temperature difference between the cold end heat sink 8 and the liquid metal 9. An electric potential is generated through the thermoelectric power generation sheet 7, thereby generating current, which is then input into the lithium battery pack 6 through the connection port for storage.

[0035] Working principle of data processing module:

[0036] In order to ensure the accuracy of data acquisition and calculation, the data processing module of the wireless temperature measurement device of the hydraulic tension clamp of liquid metal power generation includes a temperature measurement processor including a DSP data acquisition card, a Chebyshev filter and an AD converter in addition to a temperature measurement processor;

[0037] The temperature measurement processor uses ARM's Cortex-M3" core processor STM32F1, and has a 1μs dual 12-bit ADC, 4Mbit / s UART, 18Mbit / s SPI, 18MHz I / O flip speed, and an on-chip integrated 32-512KB Flash memory and 6-64KB SRAM memory.

[0038] A DSP-based high-precision data acquisition card is added on the basis of the temperature measurement processor, which can achieve 32-bit data acquisition and realize 5000hz data acquisition calculation. After the data acquisition is completed, the dual 12-bit high-speed and high-precision ADC conversion module built into the processor is used to realize the conversion of temperature analog signals to digital signals, and realize high-speed continuous and high-precision sampling and processing of temperature measurement sensors. It also provides a good analysis basis for subsequent data analysis. In addition, during the data sampling process, a Chebyshev filter is added to filter and eliminate the interference noise in the sampled data, further improving the data acquisition accuracy and calculation accuracy.

[0039] Based on the above device, the temperature value collected by the temperature sensor is processed by the following steps: Figure 4 shown.

[0040] Step 1 Data collection: The temperature sensor data is transmitted to the temperature processor in real time through the IO data port of the temperature measurement processor for collection. The data sampling frequency is 5000hz.

[0041] Step 2 Preprocessing: The temperature data collected by the temperature sensor first passes through a Chebyshev filter to filter out the noise in the temperature data, and then passes through an AD converter to convert the analog signal into a digital signal for subsequent processing.

[0042] Step 3 Data encryption: Temperature data uses RSA encryption algorithm;

[0043] The RSA algorithm involves three parameters: n, e1, and e2.

[0044] Among them, n is the product of two large prime numbers p and q. The number of bits occupied by n in binary representation is the so-called key length. e1 and e2 are a pair of related values.

[0045] e1 can be any value, but it is required that e1 and (p-1)*(q-1) are relatively prime. Then e2 is selected, and it is required that: (e2*e1)mod((p-1)*(q-1))=1. (n and e1), (n and e2) are the key pair.

[0046] The RSA encryption and decryption algorithms are exactly the same. Let A be the plain text and B be the cipher text, then: A=B^e1mod n; B=A^e2 modn;

[0047] e1 and e2 can be used interchangeably, that is:

[0048] A=B^e2 mod n; B=A^e1 mod n.

[0049] Step 4 Check code: The temperature data uses a parity check algorithm. During data storage and transmission, an extra bit is added to the byte to detect errors. The check bit can be calculated by XORing the data bit.

[0050] The parity check is performed based on whether the number of "1" in the digits of a set of binary codes being transmitted is odd or even. The use of an odd number is called odd parity check, and vice versa, it is called even parity check. The type of parity check to be used is predetermined. Usually, a parity check bit is specially set to make the number of "1" in this set of codes odd or even. If odd parity is used, when the receiving end receives this set of codes, it checks whether the number of "1" is an odd number, thereby determining the correctness of the transmitted code.

[0051] Verification method:

[0052] Odd parity: Let the number of 1s in the original data sequence (including the bit to be added) be an odd number 1000110 (0). A 0 needs to be added to the end of the data sequence. Because the original 3 1s in the data sequence are already an odd number, the number of 1s will still be an odd number after adding 0.

[0053] Even parity: Make the number of 1s in the original data sequence (including the bit to be added) an even number 1000110 (1). A 1 must be added to the end of the data sequence because the original 3 1s in the data sequence are an odd number. In order to make the number of 1s an even number, a 1 needs to be added.

[0054] During the transmission of serial data, interference may cause information errors. For example, when transmitting the character 'E', each bit is:

[0055] 0100, 0101 = 45H

[0056] D7 D0

[0057] Due to interference, the last bit may become 1, and such interference causes "bit errors" in the serial data.

[0058] Odd parity: The number of "1"s in all transmitted digits (including the digits of the characters and the parity bit) is an odd number, such as:

[0059] 1 0110,0101

[0060] 0 0110,0101

[0061] Even parity: The number of "1" in all transmitted digits (including the digits of the characters and the parity bit) is an even number, such as:

[0062] 1 0100,0101

[0063] 0 0100,0101

[0064] Parity check can detect some bit errors during information transmission (odd bit errors can be detected, but even bit errors cannot). After parity check of data, the accuracy of data can be guaranteed, and the erroneous data can be eliminated to ensure the accuracy of subsequent data analysis, thus improving the efficiency of data analysis and the working effect of the entire temperature measurement device.

Claims

1. A wireless temperature measuring device for a hydraulic tension clamp for liquid metal power generation, characterized in that: The wireless temperature measuring device of the hydraulic tension clamp of liquid metal power generation comprises a protective shell, a data acquisition module, a communication module, a data processing module, a power supply module and a liquid metal power generation module; the protective shell is a hollow shell structure, a heat-conducting mounting aluminum plate is provided at the bottom thereof, and the thermally conductive mounting aluminum plate is fixed to the hydraulic tension clamp of the transmission line; the data acquisition module is a temperature sensor, the temperature sensor is located between the protective shell and the heat-conducting mounting aluminum plate, and is wiredly connected to the data processing module; the data processing module is a temperature measurement processor, which is arranged inside the protective shell and is connected to the communication module circuit board; the communication module is arranged inside the protective shell, connected to the repeater, and wirelessly transmits information with the background server through the repeater; the power supply module is a lithium battery pack, which is arranged inside the protective shell and supplies power to the temperature sensor, the temperature measurement processor, the communication module and the repeater respectively; the liquid metal power generation module is located outside the protective shell and between the protective shell and the heat-conducting mounting aluminum plate, and is wiredly connected to the lithium battery pack, and generates current through the potential formed by the temperature difference of the liquid metal to provide power for the lithium battery pack; The liquid metal power generation module is composed of a thermoelectric power generation sheet, a cold end heat sink and liquid metal. The thermoelectric power generation sheet is located between the protective housing and the heat-conducting mounting aluminum plate, and liquid metal is provided on the upper and lower surfaces of the thermoelectric power generation sheet respectively. The cold end heat sink is installed outside the protective housing. There is a temperature difference between the cold end heat sink and the liquid metal, and an electric potential is formed through the liquid metal thermoelectric power generation sheet to generate current. The temperature measurement processor includes a DSP data acquisition card, a Chebyshev filter and an AD converter; Based on the above device, the data processing module performs the following steps on the collected temperature values ​​of the hydraulic tension clamp: Step 1 Data acquisition: The temperature sensor data is collected through the DSP data acquisition card, and the collected data is sent to the temperature measurement processor for subsequent analysis. The data sampling frequency is 5000Hz; Step 2 Preprocessing: The data collected by the temperature sensor first passes through a Chebyshev filter to filter out the noise in the temperature data, passes through a DSP data collector, and then passes through an AD converter to convert the analog signal into a digital signal for subsequent processing; Step 3 Data encryption: The temperature data is encrypted using the RSA encryption algorithm; Step 4: Check code: The temperature data uses a parity check algorithm. During data storage and transmission, an extra bit is added to the byte to detect errors. The check bit can be calculated by XORing the data bit. The RSA encryption algorithm involves three parameters: n, e1, and e2; wherein n is the product of two large prime numbers p and q, and the number of bits occupied by n in binary representation, i.e., the key length; e1 and e2 are a pair of related values; e1 can be arbitrarily selected, but it is required that e1 and (p-1)*(q-1) are mutually prime; then e2 is selected, and it is required that (e2*e1)mod((p-1)*(q-1))=1; (n and e1), (n and e2) are key pairs; the encryption and decryption processes of the RSA encryption algorithm are exactly the same, assuming A is plain text and B is cipher text, then: A=B^e1modn; B=A^e2modn; e1 and e2 can be used interchangeably, i.e.: A=B^e2modn; B=A^e1modn.

2. The wireless temperature measuring device for the hydraulic tension clamp of liquid metal power generation according to claim 1 is characterized in that: A heat insulating sealing pad is also provided between the protective shell and the heat conducting mounting aluminum plate.

3. The wireless temperature measuring device for the hydraulic tension clamp of liquid metal power generation according to claim 1 is characterized in that: The top of the protective shell is also provided with a detachable top cover.

4. The wireless temperature measuring device for the hydraulic tension clamp of liquid metal power generation according to claim 3 is characterized in that: A waterproof pad is also provided between the top cover and the protective shell.

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