An On-Line WSN-based Monitoring System for Transmission Line Sag of Power Grid
Date Issued
2014
Date
2014
Author(s)
Huang, Yu-Kai
Abstract
In recent years, the power transmission equipment around the world has suffered from severe accidents such as natural environmental disasters and vandalism, which cause a huge impact on the power supply of the whole country. Therefore, it is very important to ensure the safety of EHV (extra high voltage) transmission lines and electrical tower-related equipment. Traditional ways to monitor EHV transmission lines are to use human inspections, which are not efficient and cannot response to the events that occur on EHV transmission lines and electrical towers in real time.
In order to improve the aforementioned problem, it is necessary to develop new monitoring technologies to ensure the stability and security of EHV transmission lines in real time. In this research an autonomous power wireless sensing system used to monitor EHV transmission lines is proposed. This system combines with the long-distance WAN transmission technology to achieve the purpose of remote real-time monitoring. The monitoring objectives can be divided into two parts: for the EHV transmission lines and for the towers. For transmission lines, the monitored parameters include the voltage and current of transmission lines, conductor temperature, ambient temperature and humidity, ambient illumination, vibration levels and sag. Each power tower is equipped with a meteorological module which measures temperature and humidity, wind speed and direction, and rainfall mainly to monitor local climate change. Additionally, in order to prevent electrical tower sliding or collapsing, a triaxial accelerometer is used to monitor the vibration tilt in the electrical tower.
Another main objective of this study is to use an angle-sag relationship equation to directly estimate the sag of the EHV transmission lines. Different lengths and tension of transmission lines are tested to examine the accuracy of the proposed method. The research result shows that the sag errors are less than 10 cm. Because the degree of the sag of transmission lines is directly related to the tension of transmission lines, heat capacity, and head-room clearance, the sag can be evaluated without attaching extra costs. In addition, since the terrain where each electrical tower locates varies, this study proposes a sag-clearance estimated algorithm to calculate the relationship between each power line and ground obstructions to detect the critical location of the transmission line where the line is most likely to contact the obstacle.
Subjects
無線感測器網路
垂降估算
超高壓輸電線
測距演算法
Type
thesis
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