CN203908712U - Online stress-monitoring system used for power line tower - Google Patents

Abstract

The utility model discloses an on-line stress monitoring system for an iron tower of a transmission line, comprising an on-site intelligent monitoring terminal and a 3G unit connected through an RS485 bus, and the 3G unit is sequentially connected with a transmission line state monitoring agency device and a monitoring center. The on-line stress monitoring system of the iron tower of the transmission line of the utility model realizes the on-line monitoring of the magnitude of the stress suffered by the iron tower of the transmission line.

Description

Online Tower Stress Monitoring System for Transmission Lines

technical field

The utility model belongs to the technical field of on-line stress monitoring equipment for transmission lines, in particular to an on-line stress monitoring system for iron towers of transmission lines.

Background technique

Due to the long-term external environmental loads such as icing load, wind load, and tower foundation looseness, the transmission line tower has a great impact on the safe and reliable operation of the transmission line, especially the wires and ground wires on both sides of the transmission tower. When the amount of ice is different, the transmission line tower will be tilted due to unbalanced tension. When the problem is serious, it will cause the tower to fall and break the line, which will not only bring huge economic losses to the society, but also seriously affect people. daily life.

With the continuous upgrading and development of the power system, frequent accidents of tower collapse and disconnection of transmission lines have seriously affected the safe operation of the power grid, and large-scale transmission lines have been damaged. In order to ensure the safe operation of the power grid, it is necessary to monitor the stress distribution of the transmission line tower online to obtain the most stressed parts of the transmission line towers, and finally to timely feedback the stress of the transmission line tower to the operation and maintenance personnel.

Utility model content

The purpose of the utility model is to provide an online monitoring system for the stress of the iron tower of the transmission line, which can monitor the stress on the iron tower of the transmission line in real time.

The technical solution adopted by the utility model is that the on-line monitoring system for the iron tower stress of the transmission line includes an on-site intelligent monitoring terminal and a 3G unit connected through the RS485 bus, and the 3G unit is sequentially connected with the transmission line state monitoring agent device and the monitoring center.

The utility model is also characterized in that,

The on-site intelligent monitoring terminal includes a microprocessor, the microprocessor is connected to the data storage unit through the parallel port, the microprocessor is connected to the A/D converter through the serial port, and the microprocessor is connected to the power supply through the wire; A/D The D converter is connected with the optical fiber stress sensor module, the temperature and humidity sensor and the wind direction and wind speed sensor respectively through the 485 communication line; the microprocessor is connected with the 3G unit through the serial port.

The 3G unit uses TD-SCDMA.

The fiber optic strain sensor module consists of multiple fiber optic strain sensors.

The fiber optic stress sensor uses an integrated wireless fiber optic stress sensor.

The power supply is 82AB2951 power supply.

The temperature and humidity sensor uses the SHT11 temperature and humidity sensor or the SHT71 temperature and humidity sensor.

The wind direction and wind speed sensor uses an ultrasonic wind direction and wind speed sensor.

What the microprocessor uses is MSP430 one-chip computer.

The beneficial effects of the utility model are:

1. The optical fiber stress sensor is used in the online monitoring system for the transmission line tower stress of the utility model, and the optical fiber stress sensor can monitor the strain on the elastic substrate when the transmission line iron tower is under stress, and has the characteristics of high sensitivity and high precision;

2. The utility model transmission line iron tower stress online monitoring system sends the data obtained by the on-site intelligent monitoring terminal to the monitoring center through the 3G unit, and the expert software in the monitoring center integrates the data. If the iron tower stress analysis exceeds the yield strength of the material , The utility model transmission line iron tower stress on-line monitoring system will timely notify the staff through the expert software interface display, sound alarm, GSM network mobile phone text message alarm light, so that the staff can take corresponding measures.

Description of drawings

Fig. 1 is the structural representation of the utility model transmission line iron tower stress on-line monitoring system;

Fig. 2 is a curve diagram of the relationship between ice thickness and stress obtained by using the on-line monitoring system for the transmission line iron tower stress of the utility model.

In the figure, 1. Optical fiber stress sensor, 2. Transmission line status monitoring agent device, 3. Data storage unit, 4.3G unit, 5. Monitoring center, 6. On-site intelligent monitoring terminal, 7. Temperature and humidity sensor, 8. Wind direction and wind speed Sensor, 9. Microprocessor, 10. Power supply, 11. A/D converter, 12. Optical fiber stress sensor module.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The utility model power transmission line iron tower stress on-line monitoring system, its structure as shown in Figure 1, includes the on-site intelligent monitoring terminal 6 connected by RS485 bus (on-site intelligent monitoring terminal is also referred to as CMD) and 3G unit 4, 3G unit 4 is connected with The power transmission line status monitoring agent device 2 (also referred to as CMA) and the monitoring center 5 (monitoring center is also referred to as CAG) are connected.

On-site intelligent monitoring terminal 6, as shown in Figure 1, comprises microprocessor 9 (microprocessor is called for short MCU again), and microprocessor 9 is connected with data storage unit 3 by parallel port, and microprocessor 9 communicates with A/D converter 11 is connected, and microprocessor 9 is connected with power supply 10 by wire, and A/D converter 11 is connected with optical fiber stress sensor module 12, temperature and humidity sensor 7 and wind direction wind speed sensor 8 by 485 communication lines respectively; The processor 9 is connected with the 3G unit 4 through a serial port.

The fiber optic stress sensor module 12 is composed of a plurality of fiber optic stress sensors 1; there are three fiber optic stress sensors 1; the fiber optic stress sensor 1 is an integrated wireless fiber optic stress sensor.

3G unit 4 uses TD-SCDMA.

What power supply 10 adopted is 82AB2951 power supply.

The temperature and humidity sensor 7 is a temperature and humidity sensor of SHT11/SHT71.

The wind direction and wind speed sensor 8 adopted an ultrasonic wind direction and wind speed sensor.

What microprocessor 9 adopted was MSP430 single-chip microcomputer.

During use, the optical fiber stress sensor module 12, the temperature and humidity sensor 14, and the wind direction and wind speed sensor 15 are all arranged on the transmission line iron tower to bear the icing load, the wind load, and other external environment impacts such as the tower head rod parts (towers) with high frequencies. head) on it.

The functions of each component in the utility model transmission line iron tower stress online monitoring system:

The optical fiber stress sensor 1, the temperature and humidity sensor 14 and the wind direction and wind speed sensor 15 are all installed on the tower head of the transmission line iron tower to monitor the corresponding data, including the stress value, temperature and humidity value and wind speed value of the rod. .

A plurality of optical fiber stress sensors 1 in the optical fiber stress sensor module 12 converts the monitored stress value of the bar into stress analog signals, and the stress analog signals are transmitted to the A/D converter 11 through the 485 communication line.

The A/D conversion module 11 converts the received stress analog signal into a stress digital signal.

Microprocessor 9 is the core component in the on-line monitoring system for the iron tower stress of the transmission line of the utility model, and is used for real-time processing of a large amount of data;

The data storage unit 3 can realize a large-capacity flash memory 512K, which is used to store the operation status of the transmission line iron tower stress online monitoring system and the monitored data information;

The 3G unit module 4 is used to send the data information currently monitored by the transmission line iron tower stress online monitoring system and receive commands from the monitoring center 5. The format of the data message of the acquisition unit taken in the 3G unit module 4 is specifically shown in Table 1:

Table 1 Data message format of acquisition unit

Power supply 10 is used for the power supply of microprocessor 9;

The monitoring center 5 is used to integrate and process the monitoring data obtained through monitoring, so as to transmit it to the engineering management system and notify the staff to take certain measures in time.

The transmission line status monitoring agent device 2 is used to locally manage and cooperate with the on-site intelligent monitoring terminals 6 on various transmission lines, collect and access the monitoring data of various on-site intelligent monitoring terminals 6, and perform two-way security with the monitoring center 5 Data communication; in addition, the monitoring center 5 can be connected to the project management system (also referred to as PMS), and the data received at this time will be transmitted to the project management system for further processing. The basic concept of the project management system is to use relevant optimization analysis methods to realize The overall function of the online monitoring system is improved.

The working process of the utility model transmission line iron tower stress online monitoring system is as follows:

The optical fiber stress sensor module 12, the temperature and humidity sensor 14 and the wind direction and wind speed sensor 15 respectively transmit the stress value, temperature and humidity value and wind speed value borne by the rod member obtained through monitoring to the A/D converter 11 through the 485 communication line; D conversion 11 converts the obtained stress analog signal of the bar into the stress digital signal of the bar and sends it to the microprocessor 9; the data storage unit 3 stores the stress digital signal of the bar received by the microprocessor 9 During this period, power is supplied to the microprocessor 9 through the power supply 10, and the stress analog signal borne by the rod after being processed by the microprocessor 9 is sent to the transmission line state monitoring agent device 2 through the 3G unit 4, and the transmission line state monitoring agent The device 2 is transported to the monitoring center 5, and the monitoring center 5 notifies the staff to take corresponding measures in time.

The monitoring mechanism of the optical fiber stress sensor 1 and the calculation method of the tower load of the transmission line are as follows:

When the transmission line tower is subjected to dynamic loads, the strain offsets on the upper and lower surfaces of the elastic body of the optical fiber stress sensor 1 caused by the bending moment on the transmission line iron tower are equal in magnitude and opposite in direction, and the elastic matrix of the optical fiber stress sensor 1 is used The method of calculating the average value of the measurement results of the two strain gauges above can effectively reduce the measurement error caused by the eccentric load. The relationship between stress and strain is shown in the following formula:

σ＝E(ε ₁ +ε ₂ )/2 (1);

In formula (1), σ is the stress of the elastic matrix, the unit is MPa; E is the modulus of elasticity, the unit is N/mm ² ; ε ₁ and ε ₂ are the strains of the elastic matrix, the unit is mm/m;

The transmission line tower has been subjected to the icing weight of the transmission wire and the wind load, and the icing weight per unit length _Qb and the wind load W of the tower structure are respectively implemented according to the following algorithm;

Q _b =27.73b(b+d)×10 ^-3 (2);

W=β _z μ _s μ _z w ₀ F (3);

In formula (2), b-thickness of transmission wire ice coating, unit: mm; d-outer diameter of transmission wire, unit: mm;

In formula (3), w ₀ - basic wind pressure, unit: kN/m ² ; β _z - wind pressure adjustment coefficient; μ _s - wind carrier type coefficient of iron tower structure; μ _z - wind pressure height variation coefficient; F - iron tower The projected area of the structure perpendicular to the wind direction, unit: m ² ;

Wherein, the stress σ and the ice thickness b are the data obtained by the online monitoring system of the present invention, and other data can be obtained through table lookup and calculation.

The stress measurement principle of the optical fiber stress sensor 1 is that it is formed by using ultraviolet exposure technology to cause periodic changes in the refractive index in the optical fiber core. The installation position of the optical fiber stress sensor 1 depends on the stress distribution of each rod on the transmission line iron tower. .

In order to verify the measurement performance of the optical fiber stress sensor 1 in the online monitoring system for the transmission line tower stress of the present utility model, a finite element model of the transmission line iron tower was established through the ANSYS simulation software, and the wind speed was 25m/s and the ambient temperature was -15°C. The range of the ice-covered thickness of the transmission wire is 10mm to 60mm; then the nonlinear static analysis is performed on the transmission line tower model, and the ANSYS simulation analysis and the online monitoring of the transmission line iron tower rod (that is, the smallest unit of the iron tower) are carried out by the optical fiber stress sensor 1 The relationship between the corresponding maximum stress and ice thickness under different ice coating conditions, as shown in Figure 2, the wavelength of reflected light in the optical fiber stress sensor 1 is very sensitive to temperature, stress and strain, when the elastic body of the optical fiber stress sensor 1 is under pressure When the optical fiber and the elastic body are strained together, the peak wavelength of the reflected light of the optical fiber drifts, and the sensing of temperature, stress and strain is realized by measuring the wavelength drift; the stress and coverage of the transmission line tower analyzed by ANSYS simulation software The relationship between ice thickness is shown in Table 2:

Table 2 Relationship between transmission line tower stress and ice thickness

Through the ANSYS simulation software, the stress of the transmission line tower is analyzed, as shown in Table 2. From this, it can be analyzed that: with the continuous increase of the ice thickness on the transmission wire, the stress on the transmission line tower is also increasing; If the ice thickness on the transmission wire continues to increase, it may cause the stress on the transmission line tower to exceed its allowable stress, causing the transmission line tower to collapse.

The on-line monitoring and data analysis of the stress distribution of each rod of the transmission line iron tower by the online monitoring system for the transmission line iron tower stress of the utility model keeps the stress borne by the iron tower in the transmission line always within the range of safe and stable operation, and provides benefits to the society. Reduced certain economic losses.

Claims (9)

1. iron tower of power transmission line Stress On-Line system, it is characterized in that, include the site intelligent monitoring terminal (6) and 3G unit (4) that by RS485 bus, connect, described 3G unit (4) is connected with power transmission line state monitoring agent device (2), Surveillance center (5) successively.

2. iron tower of power transmission line Stress On-Line system according to claim 1, it is characterized in that, described site intelligent monitoring terminal (6), include microprocessor (9), described microprocessor (9) is connected with data storage cell (3) by parallel port, described microprocessor (9) is connected with A/D converter (11) by serial port, and described microprocessor (9) is connected with power supply (10) by wire;

Described A/D converter (11) is connected with optical fiber stress sensor module (12), Temperature Humidity Sensor (7) and wind direction and wind velocity sensor (8) by 485 order wires respectively;

Described microprocessor (9) is connected with described 3G unit (4) by serial ports.

3. iron tower of power transmission line Stress On-Line system according to claim 1 and 2, is characterized in that, that described 3G unit (4) adopts is TD-SCDMA.

4. iron tower of power transmission line Stress On-Line system according to claim 2, is characterized in that, described optical fiber stress sensor module (12) is comprised of a plurality of optical fiber stress sensors (1).

5. iron tower of power transmission line Stress On-Line system according to claim 4, is characterized in that, what described optical fiber stress sensor (1) adopted is integrated wireless optical fiber stress sensor.

6. iron tower of power transmission line Stress On-Line system according to claim 2, is characterized in that, what described power supply (10) adopted is 82AB2951 power supply.

7. iron tower of power transmission line Stress On-Line system according to claim 2, is characterized in that, what described Temperature Humidity Sensor (7) adopted is SHT11 Temperature Humidity Sensor or SHT71 Temperature Humidity Sensor.

8. iron tower of power transmission line Stress On-Line system according to claim 2, is characterized in that, what described wind direction and wind velocity sensor (8) adopted is ultrasonic type wind direction and wind velocity sensor.

9. iron tower of power transmission line Stress On-Line system according to claim 2, is characterized in that, what described microprocessor (9) adopted is MSP430 single-chip microcomputer.