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Basic Concepts of Dance

Overhead transmission lines in the operation process will be due to the role of natural conditions and a variety of disasters and accidents, dance is one of the more serious hazards. Dance is uneven ice-covered wire in the wind under the action of a low-frequency (about 0.1 ~ 5Hz), large amplitude (about 20 ~ 300 times the diameter of the wire) of the self-excited vibration, in the vibration of the form of a pitch in a stall only one or a few half-waves. Transmission line dance occurs usually depends on three elements: uneven ice cover on the conductor, wind excitation and line structural parameters. Dance generated by the harm is multi-faceted, the light will occur flashover, tripping, the heavy occurrence of gold and insulator damage, conductor strand breakage, wire breakage, tower bolts loose, fall off, or even fall tower, resulting in major grid accidents. Dance problem in essence for the nonlinear dynamics of the problem, coupled with a variety of complex random factors, making it difficult to manage thoroughly, is recognized as a worldwide problem in the field of mechanical mechanics of overhead transmission lines. With the development of China's power grid construction, in recent years, China's overhead transmission line dancing accident frequency and intensity increased significantly, dancing has become one of the most important factors threatening line safety in China.

System architecture

In the transmission line installed on the dance monitoring terminal, with the tower installed on the data transmission base station, real-time access to conductor dance amplitude, trajectory and location information, conductor dance state analysis, real-time monitoring of dance state and risk prevention and control, to remind the operation and inspection personnel in a timely manner to take effective protective measures to reduce the dance on the conductor brought about by the injury to improve the safety of power supply of transmission lines.

System function

● Data acquisition

1 Acquisition of the movement attitude of the guide line and meteorological parameters;

2 Acquisition of single-point localization position information of the dance monitoring terminal;

3 Obtain the temperature of the guide wire;

4 Power supply voltage, operating temperature, solar panel;

● Data processing

Dance monitoring terminal has edge computing capability with the following data processing functions:

Analysis function: pre-process the collected data, automatically identify and eliminate the interfering data;

Calculation function: derive data such as dance trajectory, dance amplitude, dance ellipse inclination angle and dance frequency.

● Data output

The output information includes dance waveform, dance amplitude, vertical dance amplitude, horizontal dance amplitude, elliptical tilt angle, dance frequency, meteorological parameters, as well as data such as power supply voltage and operating temperature.

● Data Communication

Data communication, information security and application layer data transmission protocols meet the relevant requirements of Q/GDW 1242.

● Remote Maintenance

The system is equipped with status self-test, self-diagnosis and self-recovery.

Dance monitoring terminal function

The transmission line dance monitoring terminal is installed on the monitored conductor and mainly consists of power supply system, main control unit, IMU inertial measurement unit and Lora RF communication unit.

Main technical features

 Advanced intelligent algorithm, accurately and efficiently restore the actual wiredance characteristics;

 Ultra-low power consumption design, no light working time is more than 40days;

 Solar + battery power supply, compact structure, small size, light weight, easy toinstall;

 Can be adapted to different voltage levels of different wire models;

 Has the performance of rain, moisture, corrosion, vibration, lightning,electromagnetic interference and so on;

 Conforms to the national standard GB/T 35697-2017 General TechnicalSpecification for Online Monitoring Device for Overhead Transmission Lines

 In line with the State Grid Corporation standard Q/GDW 10555-2016 TechnicalSpecification for Transmission Line Dance Monitoring Device

Data transmission base station

The data transmission base station is mounted on the tower, which mainly consists of solar panels, main control and power supply system, and communication unit. The communication unit consists of two units: Lora communication unit and 4Gcommunication unit, which communicate with the dance monitoring terminal installed on the conductor and with the transmission dance early warning and monitoring platform to realize reliable data transmission.

Main technical features

 Ultra-low power consumption design, no light working time is more than 30days;

 Adopts integrated design, compact structure, small volume, light weight, easy toinstall;

 Has the performance of rain, moisture, corrosion, vibration, lightning andelectromagnetic interference;

 Reserves expansion interface to support function expansion;

 Complies with the national standard GB/T 35697-2017 General TechnicalSpecification for Online Monitoring Devices for Overhead Transmission Lines

 Conforms to the State Grid Corporation standard Q/GDW 10555-2016 TechnicalSpecification for Transmission Line Dance Monitoring Device

Deployment program

Transmission line dance monitoring terminals are installed 1 per file, and the installation position is 2/9 from the wire clip. Adjacent stalls are installed in phase change; the first three orders of dance wave nodes should be avoided; if the line is installed with phase spacing bars, the installation location should be avoided;The data transmission base station is installed on the tower nearby, and one set is deployed for every two towers in the zone

Products Description of Dance monitoring terminal function

Technical Parameters: