Abstract
In view of the threat of metal particles to the insulation performance of AC GIL (Gas insulated transmission line), this paper uses aluminum powder to simulate the metal particles which are closer to the engineering practice, A scaled-down model similar to the actual GIL structure was built to study the movement characteristics of aluminum powder in GIL. The discharge, movement and distribution characteristics of aluminum powder was recorded in experiment. The research shows that the particles from spacer to the part below the shielding should be prevented. The particles with particle size of about 150 mesh move more violently. At the same time, the movement of powder particle in GIL is affected by Van der Waals force. According to the characteristics of particle motion distribution, grid-shaped trap and strip-shaped trap were designed and compared in this paper, and the trap capture coefficient was proposed. Finally, the suggestion of particle trap arrangement is put forward, that is, grid-shaped trap can be set near the spacer, and strip-shaped trap can be selected for the rest of the GIL.
Highlights
Due to the gas-insulated transmission line (GIL) has advantages such as low transmission losses, low capacitive load, large transmission capacity, high reliability, and suitable for long-distance power transmission, since the 1970s, Germany, U.S, Japan, and other countries have been established 72∼1200 kV GIL successively
The results show that the ultra-high frequency (UHF) method has good detection performance in both laboratory and the practical
EXPERIMENT RESULTS Fig. 3 shows the typical UHF and ultrasonic signals collected in an experiment
Summary
Due to the gas-insulated transmission line (GIL) has advantages such as low transmission losses, low capacitive load, large transmission capacity, high reliability, and suitable for long-distance power transmission, since the 1970s, Germany, U.S, Japan, and other countries have been established 72∼1200 kV GIL successively. With the development of technology, GIL is gradually replacing traditional electric cables and overhead transmission lines, becoming the trend of power transmission in the future [1], [2]. GIL has been developing towards a higher voltage level and installing in a more complex environment. During the production, transportation, and installation of GIL, due to the influence of welding, abrade of sliding spacers and construction environment, powder and other particles will be inevitably introduced in the cavity. These particles are charged and forced to move in the nonuniform electric field in the GIL, which is easy to adsorb
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