Power transmission line wire aeolian vibration monitoring device

Abstract

The invention provides a power transmission line wire aeolian vibration monitoring device, relates to the technical field of wire monitoring equipment, and solves the technical problem in the prior art that the measurement precision is easy to change by adopting a cantilever beam type deformation or additional light deformation measurement mode. The device comprises a main control chip, a sensor and a communication chip, the power transmission line wire aeolian vibration monitoring device is installed on a power transmission line, the sensor and the communication chip are both connected with the main control chip, and the main control chip communicates with a monitoring terminal through the communication chip; the sensor is used for detecting angular velocity and angle information at a position 89mm away from an outlet of the wire clamp, and the sensor can transmit the detected information to the main control chip; the main control chip can calculate the vibration amplitude and frequency information of the position 89mm away from the outlet of the wire clamp according to the information of the receiving angular velocity and angle, and can transmit the data information to the monitoring terminal through the communication chip.

Description

Technical Field

[0001] The invention relates to the technical field of conductor monitoring equipment, and in particular to a breeze vibration monitoring device for a power transmission line conductor. Background Art

[0002] There are two methods for measuring breeze vibration: the energy balance method and the dynamic bending strain method. The energy balance method (EBM) is the most commonly used method to study the breeze vibration of transmission lines. This method believes that when a breeze blows through the transmission line, vibration energy will be input, and the input energy will be consumed by the transmission line itself. When the input and consumption of energy in the transmission line reach a balance, the vibration tends to be stable, and the vibration state of the transmission line can be determined. However, this method has many influencing factors and large calculation errors. The commonly used method at present is to measure the dynamic bending strain method. When the overhead wire vibrates in the breeze, it will bend, thereby forming a positive strain of the cross section, which is the dynamic bending strain. The dynamic bending strain can directly reflect the degree of bending of the transmission line. The increase in the dynamic bending strain value of the conductor will affect the life of the conductor, and in severe cases, the conductor will break or break. According to the "Technical Specifications for Breeze Vibration Monitoring Devices for Transmission Lines", the bending amplitude method is the standard method for monitoring the breeze vibration of transmission lines. The bending amplitude at a position 89mm away from the outlet of the wire clamp is measured to calculate the dynamic bending strain value. Usually, cantilever beam deformation or additional light deformation measurement is adopted, but this method has high installation requirements, and the cantilever beam method is prone to change the measurement accuracy over time. Summary of the invention

[0003] The purpose of the present invention is to provide a power transmission line conductor breeze vibration monitoring device to solve the technical problem that the cantilever beam deformation or additional light deformation measurement method in the prior art easily changes the measurement accuracy. The preferred technical solution among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0004] To achieve the above object, the present invention provides the following technical solutions: The present invention provides a power transmission line conductor breeze vibration monitoring device, comprising a main control chip, a sensor and a communication chip, wherein the power transmission line conductor breeze vibration monitoring device is installed on the power transmission line, the sensor and the communication chip are both connected to the main control chip, and the main control chip communicates with a monitoring terminal through the communication chip; The sensor is used to detect the angular velocity and angle information at a position 89 mm away from the wire clamp outlet, and the sensor can transmit the detected information to the main control chip; The main control chip can calculate the vibration amplitude and frequency information at a position 89 mm away from the wire clamp outlet according to the received angular velocity and angle information, and can transmit the data information to the monitoring terminal through the communication chip.

[0005] Optionally, the communication chip includes a NB-IOT chip, the monitoring terminal includes a cloud system, and the main control chip and the cloud system are connected via the NB-IOT chip.

[0006] Optionally, the communication chip includes an RFID chip, the monitoring terminal includes a mobile terminal, and the main control chip and the mobile terminal are connected via the RFID chip.

[0007] Optionally, a linkage module is further included, which is installed in a terminal device of another system, and the linkage module is connected to the monitoring terminal through the communication chip.

[0008] Optionally, a power management module is further included, and the power management module is electrically connected to the main control chip.

[0009] Optionally, the power management module includes a solar panel and a lithium battery.

[0010] Optionally, the monitoring terminal includes an alarm element, a storage element and a data display element.

[0011] The present invention provides a power transmission line conductor breeze vibration monitoring device, in which a sensor detects the angular velocity and angle information at a position 89 mm away from the wire clamp outlet, and then transmits the angular velocity and angle information to a main control chip, and the main control chip calculates the breeze vibration amplitude and vibration frequency of the power transmission line conductor according to the angular velocity and angle, and then the main control chip transmits the calculated data information to a monitoring terminal through a communication chip. By measuring the power transmission line conductor in this way, data accuracy can be maintained and measurement accuracy is not easily affected, thereby solving the technical problem in the prior art that the measurement accuracy is easily changed by using cantilever beam deformation or additional light to measure deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a connection diagram of a power transmission line conductor breeze vibration monitoring device provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of a transmission line conductor bending amplitude method of a transmission line conductor breeze vibration monitoring device provided by an embodiment of the present invention.

[0014] In the figure, 1. Main control chip; 2. Sensor; 3. NB-IOT chip; 4. Cloud system; 5. RFID chip; 6. Mobile terminal; 7. Power management module. DETAILED DESCRIPTION

[0015] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0016] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "multiple" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] The present invention provides a power transmission line conductor breeze vibration monitoring device, comprising a main control chip 1, a sensor 2 and a communication chip, wherein the power transmission line conductor breeze vibration monitoring device is installed on the power transmission line, the sensor 2 and the communication chip are both connected to the main control chip 1, and the main control chip 1 communicates with a monitoring terminal through the communication chip; Sensor 2 is used to detect the angular velocity and angle information at a position 89 mm away from the wire clamp outlet, and sensor 2 can transmit the detected information to the main control chip 1; The main control chip 1 can calculate the vibration amplitude and frequency information at a position 89mm away from the wire clamp outlet according to the received angular velocity and angle information, and can transmit the data information to the monitoring terminal through the communication chip. The present invention provides a power transmission line conductor breeze vibration monitoring device, the sensor 2 will detect the angular velocity and angle information at a position 89mm away from the wire clamp outlet, and then transmit the angular velocity and angle information to the main control chip 1, the main control chip 1 will calculate the breeze vibration amplitude and vibration frequency of the power transmission line conductor according to the angular velocity and angle, and then the main control chip 1 will transmit the calculated data information to the monitoring terminal through the communication chip, and the transmission line conductor can be measured in this way, so as to keep the data accurate and not easily affect the measurement accuracy, which solves the technical problem that the cantilever beam deformation or additional light deformation measurement method in the prior art easily changes the measurement accuracy.

[0019] The main control chip 1 is a STM32F103ZET6 chip based on the Cortex-M3 ARM core, which has the advantages of low power consumption, high performance and low cost. The present invention mainly uses serial port functions, timer functions and IIC bus. This main control chip 1 can consume 36mA of current (all peripherals are in working state) when working at 72MHz in low power consumption state, and drops to 2μA when in standby. It also has the maximum integration, such as reset circuit, voltage regulator, low voltage detection, accurate RC oscillator, etc. The power supply is 3.3V DC, and the operating temperature is -40℃ to +85℃ or 105℃. It has 4 16-bit general-purpose timers and 3 12-bit us-level A / D converters. STM32 has three working modes: sleep, shutdown and standby.

[0020] Sensor 2 selection In order to meet the requirements of low power consumption and miniaturization on the design side, a low power consumption, high precision and miniaturized sensor chip ICM-20948 needs to be selected. ICM-20948 is a small and thin ultra-low power 3-axis accelerometer with high resolution (14 bits) and a measurement range of ±16g. The digital output data is in 16-bit binary complement format and can be accessed through SPI (3-wire or 4-wire) or I2C digital interface. ICM-20948 is very suitable for extremely low power device applications. It can measure static gravity acceleration in tilt detection applications, and can also measure dynamic acceleration caused by motion or impact.

[0021] As an optional implementation, the communication chip includes an NB-IOT chip 3, the monitoring terminal includes a cloud system 4, and the main control chip 1 and the cloud system 4 are connected via the NB-IOT chip 3. In a general area (area covered by a remote communication signal), the NB-IOT communication method is mainly used to upload the monitoring data and alarm data in the main control chip 1 to the cloud system 4 via the NB-IOT chip 3.

[0022] The application of low-power technology in NB-IoT networks involves many aspects, requiring in-depth understanding and analysis of all factors affecting power consumption, and evaluation of parameters such as RF performance, battery power consumption, protocol behavior, and application performance. At the same time, it is necessary to consider the application characteristics and requirements of terminal equipment and network side operation, such as the behavioral characteristics of the network and the characteristics of the IP network, and the requirements of the business operation scenario for real-time communication. After comprehensive comparison and consideration, the N21 wireless communication module is adopted, which is an ultra-small package NB-IoT industrial-grade wireless communication module. The module features ultra-low power consumption, wide area coverage, simple peripheral circuits, and easy development for customers. It is suitable for low-speed and low-power IoT communication devices. The module adopts a 22-pin LGA package with an external size of only 18mm*13.8mm*2.5mm, and the structure can basically meet the space size requirements of this application.

[0023] As an optional implementation, the communication chip includes an RFID chip 5, the monitoring terminal includes a mobile terminal 6, and the main control chip 1 and the mobile terminal 6 are connected via the RFID chip 5. In an area without a remote communication signal, the mobile terminal 6 directly obtains monitoring data and alarm information from the main control chip 1 via RFID communication, and performs disposal analysis at the mobile terminal 6, guides operation and maintenance work on the spot according to the results, and uploads the current data to the cloud system 4 in a signal area.

[0024] The near field communication in this terminal is an active RFID communication method built with a 2.4G network, which is built by combining the CC2500 wireless transceiver chip and the AT2401C RF front-end chip. The CC2500 is a low-cost, truly monolithic 2.4GHz transceiver designed for low-power wireless applications. The circuit is set to the ISM (Industrial, Scientific and Medical) and SRD (Short Range Device) frequency bands of 2400-2483.5MHz. The RF transceiver integrates a highly configurable modem with a data transmission rate of up to 500kbps. Performance can be improved by turning on the forward error correction option integrated in the modem. The CC2500 provides extensive hardware support for packet processing, data buffering, burst data transmission, clear channel assessment, connection quality indication, and electromagnetic wave excitation.

[0025] As an optional implementation, a linkage module is also included, which is installed in the terminal equipment of other systems, and the linkage module is connected to the monitoring terminal through a communication chip. The alarm data of the monitoring terminal is obtained by RFID communication, and then the channel visualization terminal and other devices are linked through RS485 or IO port. The linkage module is installed in the terminal device of other systems.

[0026] As an optional implementation, it also includes a power management module 7, which is electrically connected to the main control chip 1, and includes a solar panel and a lithium battery. In order to fully ensure the continuous power supply capability of the present invention, a combination of solar panels and lithium batteries is used to power the system. During the day, the lithium battery can be charged and the system can be powered. At night, the lithium battery can power the system, ensuring that the system is "self-sufficient" in terms of power.

[0027] As an optional implementation, the monitoring terminal includes an alarm element, a storage element and a data display element.

[0028] The present invention complements RIFD and NB-IOT technologies to form a hybrid communication mode, solving the problem of remote transmission and local acquisition of monitoring data; using high-precision capacitive acceleration sensors, accurate measurement of conductor breeze vibration data is achieved, effectively avoiding the shortcomings and drawbacks of existing conventional monitoring methods. The design features of the monitoring terminal are low power consumption and miniaturization, optimized control, monitoring and communication function design, abandonment of redundant and impractical functions, and miniaturization of products, which can effectively reduce costs.

[0029] If the slippage of the transmission line and the friction between the strands are ignored, the wire can be regarded as a rigid body, and the distance from the center line to the edge of the outermost strand can be approximated as the radius of the wire. Whether it is the slippage of the transmission line or the friction between the strands of the wire, both will lead to inaccurate calculation values. Therefore, the conversion coefficient K is multiplied in the formula to reduce the deviation of the calculated value. Formula (2) is the relationship between dynamic bending strain and bending amplitude.

[0030] (2) Where: ε is the dynamic bending strain value; K is the conversion coefficient; A is the relative bending amplitude at 89mm away from the wire clamp outlet; φ is the diameter of the wire. The K value is determined by the wire itself, that is, (3) In formula (3), f is the conductor tension; ks is the conductor bending stiffness; b is a constant, b=89mm.

[0031] The data acquisition is to convert the acceleration data using the 12-bit AD of the selected sensor and then calculate the vibration frequency of the acceleration signal through FFT.

[0032] First, the acceleration digital signal after 12-bit AD conversion has a sampling frequency of 1024Hz. After averaging, 512 samples can be obtained. Fast Fourier transform (FFT) is performed on the 512-point samples to obtain a 512-point complex sequence, any of which can be represented at a certain frequency. The relationship is shown in the following formula.

[0033] (4) In formula (4), fn is the frequency of the signal; fs is the sampling frequency; n represents the nth point, n…N1; N1 is the number of change points of FFT.

[0034] Then, the transmission line conductor vibration is a signal similar to sinusoidal vibration, which can be calculated as follows from the sinusoidal vibration signal formula: (5) (6) When the phase shift of the transmission line conductor vibration is ignored, equations (7)-(9) are obtained: (7) (8) (9) In the formula: B is the amplitude of the sine; ω is the angular frequency of the sine function; v is the velocity value; a is the acceleration value; f is the frequency of the sine signal, that is, the fn signal frequency.

[0035] From equations (4), (7)-(9), we can find the amplitude of the wire vibration: (10) Therefore, the breeze vibration amplitude An and vibration frequency fn of the transmission line conductor can be calculated.

[0036] Finally, the bending stress of the transmission line conductor at a distance of 89 mm from the clamp can be calculated using equations (10) and (2).

[0037] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A power transmission line conductor breeze vibration monitoring device, characterized in that: It comprises a main control chip (1), a sensor (2) and a communication chip, wherein: The power transmission line conductor breeze vibration monitoring device is installed on the power transmission line, the sensor (2) and the communication chip are both connected to the main control chip (1), and the main control chip (1) communicates with the monitoring terminal via the communication chip; The sensor (2) is used to detect information about the angular velocity and angle at a position 89 mm away from the wire clamp outlet, and the sensor (2) can transmit the detected information to the main control chip (1); The main control chip (1) can calculate the vibration amplitude and frequency information at a position 89 mm away from the wire clamp outlet according to the received angular velocity and angle information, and can transmit the data information to the monitoring terminal through the communication chip.

2. The power transmission line conductor breeze vibration monitoring device according to claim 1, characterized in that: The communication chip comprises a NB-IOT chip (3), the monitoring terminal comprises a cloud system (4), and the main control chip (1) and the cloud system (4) are connected via the NB-IOT chip (3).

3. The power transmission line conductor breeze vibration monitoring device according to claim 1, characterized in that: The communication chip comprises an RFID chip (5), the monitoring terminal comprises a mobile terminal (6), and the main control chip (1) and the mobile terminal (6) are connected via the RFID chip (5).

4. The power transmission line conductor breeze vibration monitoring device according to claim 1, characterized in that: It also includes a linkage module, which is installed in the terminal equipment of other systems and is connected to the monitoring terminal through the communication chip.

5. The power transmission line conductor breeze vibration monitoring device according to claim 1, characterized in that: It also comprises a power management module (7), wherein the power management module (7) is electrically connected to the main control chip (1).

6. The power transmission line conductor breeze vibration monitoring device according to claim 5, characterized in that: The power management module (7) comprises a solar panel and a lithium battery.

7. The power transmission line conductor breeze vibration monitoring device according to claim 1, characterized in that: The monitoring terminal includes an alarm element, a storage element and a data display element.

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