Weak Signal Measuring Techniques in On-Line System for Contaminated Insulators

摘要

On-line monitoring techniques for leakage current of contaminated insulators are introduced. Because the leakage current is weak and wide-banded, in order to measure it accurately in strong electromagnetic interference, a series of effective methods are adopted and realized, such as designing a special signal-acquisition instrument, realizing synchronal measurement, ect. The attributes of interference sources are analyzed. The key techniques both in software and hardware to suppress all kinds of interference and eliminate various noises are also presented.