Abstract
Tower grounding device provides the discharging channel for fault currents, ensuring the safe and reliable operation of transmission lines. However, the carbon steel tower grounding device is prone to corrosion, which affects the discharging performance and causes potential safety hazards. Existing evaluation methods are divided into subjective evaluation through excavating grounding device and objective evaluation through experimental detection. However, these methods suffer from poor accuracy in the evaluation results. In order to solve the above-mentioned problems, this paper proposed a comprehensive evaluation method for corrosivity of grounding device based on fuzzy theory, taking soil resistivity, PH value, water content and salt content as evaluation factors, and integrating subjective and objective weights based on game theory, which realizes complementary advantages of subjective and objective methods. Finally, a comprehensive evaluation algorithm for the grounding device corrosion is formed. Experiments are conducted to validate the effectiveness and accuracy of the proposed method.
Highlights
The grounding device can discharge the fault current rapidly when the power system fails
This paper selects the soil resistivity, PH value, moisture and salt content as the corrosion evaluation factor, which can be quantitatively measured on site
INTEGRATION OF SUBJECTIVE AND OBJECTIVE WEIGHT BASED ON GAME THEORY In order to ensure scientific results and achieve as much as possible complementary advantages, this paper proposes a comprehensive integration weight method based on game theory [23]: integrating subjective weight and objective weight, so as to minimize the deviation between the comprehensive weight and subjective and objective weight
Summary
The grounding device can discharge the fault current rapidly when the power system fails. Many factors in the soil environment affect the corrosion rate and residual life of the grounding device. The excavation is carried out only when abnormal grounding resistance is found, or an electrical accident happens This method has drawbacks of heavy workload, time-consuming, and is limited by the on-site testing conditions [4]. Sen studied the experimental data from the US National Bureau of Standards with 44 types of soils for 12 years He obtained the accurate fitting formula of the corrosion rate of the steel in the soil [9]. This paper proposes a comprehensive assessment method to improve the accuracy of the corrosion rate. This method mainly studies the natural corrosion of grounding device in soil environment. A typical experimental case is conducted to verify the accuracy of the comprehensive assessment method
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call