On line monitoring device for Beidou geological hazard of transmission line

model：DX-WPS100-DZ

1、 Demand analysis

In recent years, the ground deformation caused by mining subsidence of domestic transmission towers mainly includes vertical movement and deformation (subsidence, inclination, curvature and distortion), horizontal movement and deformation (horizontal movement, tensile and compression deformation) and shear strain in the surface plane. These surface deformations will directly affect the foundation, tower and span of the high-voltage transmission line tower, and further cause the deformation of other elements of the high-voltage transmission line, even collapse and destruction accidents from time to time, seriously endangering the safety of the power grid. Therefore, it is necessary to establish a set of online monitoring device for Beidou settlement of transmission line poles and towers. Through this device, you can know the real-time situation of the tilt settlement of each pole and tower at any time, and comprehensively improve the management level of transmission line poles and towers.

2、 Working principle

The transmission line Beidou geological disaster online monitoring device adopts the millimeter or centimeter Beidou high-precision relative positioning technology. The relative positioning is that two (or more) receivers are respectively placed at both ends of one (or more) baseline to synchronously observe the same Beidou satellite to determine the relative position or baseline vector of the baseline endpoint. During relative positioning, the difference of observation measurement can eliminate the satellite clock error and receiver clock error, weaken the influence of ionospheric and tropospheric refraction, eliminate the ambiguity parameter, etc., and improve the baseline accuracy. Beidou monitoring antenna is arranged on the iron tower to be located, combined with the data of Beidou ground-based enhancement station, and then the carrier phase data required for the calculation is calculated through the encrypted communication transmission network The ephemeris and other data are sent to the data center at the same time. The data center obtains the original real-time data stream of each monitoring point and the base station. The Beidou data processing engine is used to calculate the baseline between the base station and the positioning point to obtain high-precision real-time three-dimensional coordinates of the tower, so as to monitor the tower settlement.

3、 Technical characteristics

(1) Basic configuration of Beidou geological disaster monitoring: main control unit, Beidou settlement monitoring unit, communication unit, power supply unit, installation support and auxiliary materials;

(2) Collect high-precision real-time three-dimensional coordinates, base station observation data, monitoring point observation data, as well as ephemeris, precise ephemeris and other data. The encrypted data is sent to the service platform through 4G/5G signals for calculation, and then the data is analyzed using Beidou Foundation Enhancement Network resources. (3) Functions of Beidou receiver: including all equipment of security protection facilities such as data acquisition, centralized transmission, solution processing, display and recording, lightning protection and anti-theft, to realize the transmission and display of monitoring data to the monitoring center;

(4) The monitoring system is unattended: it is watched and operated automatically, with an annual operation reliability rate of more than 99%, and the system can meet 7 × It operates reliably for a long time in 24 hours, and the continuous trouble free operation time exceeds 100000 hours.

(5) Real time data display and analysis of variables to assess health status intermittently;

(6) Automatic calculation of the central software: the short response time can be from a few minutes to several hours, and the network adjustment can be carried out in real time, and the monitoring results can be automatically evaluated. Moreover, the parameters are completely set by the user according to different monitoring needs.

(7) Daily channel alarms are diverse: Web and APP releases and can alarm via SMS, so you can master the dynamics of power tower variants no matter when and where you are;

(8) Real time monitoring of the spatial displacement of the power tower deformation point to determine the deformation status and geometric alignment of the power tower deformation area;

(9) Provide high-quality dual frequency Beidou measurement data, and obtain position data with millimeter level accuracy in real time. The static accuracy is less than ± 2mm+0.5ppm for horizontal and less than ± 4mm+0.5ppm for vertical; Real time monitoring accuracy in wind load vibration of power tower: less than ± 10mm, vertical: less than ± 20mm

(10) The report is automatically generated. The user can design the period for generating the report, such as one week, one day, etc. Some necessary output information can also be automatically added or deleted by the user. At the same time, the weekly change curve and monthly change curve of each point can be automatically generated as required.

(11) The system adopts modular design and has standardized and integrated design to facilitate on-site installation and maintenance.

4、 Product parameters

Serial No	category	project	technical parameter
1	Overall performance	Complete machine configuration	Main control unit, Beidou settlement monitoring unit, communication unit, power supply unit, installation support and auxiliary materials;
		Overall quality	Less than 40KG (including solar panel and support)
		texture of material	Stainless steel body+hot galvanized support
2	Beidou Settlement Monitoring Unit	*Observation frequency	Receive multiple navigation satellite system BDS (B1/B2), GPS (L1/L2)
		*Measurement accuracy	Horizontal accuracy: ± 2.5 mm+0.5 ppm; Vertical accuracy: ± 5 mm+0.5 ppm;
		Signal receiving sensitivity	≤-133dBm
		Power Supply	Power input port
		antenna	One GNSS antenna interface, socket type TNC
		*Remote control	Remote upgrade, remote reset and remote parameter setting
		Number of Beidou modules	Support 4;
3	Beidou antenna unit	*Signal tracking	It can receive GPS satellite L1 · L2 · L5 signal, GLONASS satellite L1 · L2 signal, Beidou satellite B1 · B2 · B3 signal and Galileo satellite signal
		Phase center index	The phase center stability is better than 1mm, and the phase center deviation (elevation 20 °) is less than 1.5mm (1 σ)。
		Polarization mode	Right-handed circular polarization
		Antenna beam	Azimuth angle: 0 °～ 360 °, pitch angle: 5 °～ 90 °
		Axial ratio	≤ 2dB (elevation 90 °) ≤ 4dB (elevation 20 °～ 90 °)
		VSWR	≤1.5（50Ω）
4	Communication unit	communication mode	All Netcom 4G/5G/WIFI wireless transmissions
		Data security	VPN dedicated channel can be used for communication with the master station, and encryption transmission is optional.
		Access protocol	Access to monitoring platforms of provincial power companies such as Southern Power Grid and State Grid
5	Power supply unit	Battery capacity	100Ah/12V, lithium iron phosphate battery, high reliability battery
		Solar panel power	180W/18V, single crystal silicon high-efficiency solar panel
		Power supply duration	The power supply requirement that the device can operate normally for 15 days without continuous illumination.
6	Other parameters	work environment	Working temperature: - 40~+70 ℃; Relative humidity: 5-99% RH
		Overall service life	More than 8 years
		Degree of protection	IP67