摘要：This article deals with the advanced protection of metallic loops using addition electronic components. The main goal of this article is to improve especially Advanced Technology Zone (ATZ), which is the most applied method. The improvement consists of protection against overvoltage which can destroy the Control and Indicating Equipment (CIE) and it consist of adding more states which have the impact of numbers of connected detectors. All ideas are introduced with technical details, schematic and every idea also comes with an explanation.
