| Summary: | 碩士 === 國立彰化師範大學 === 電機工程學系 === 101 === Abstract
The primary purpose of the grounding system is to protect the safety of the power equipment and the employees and to enhance the quality and reliability of electricity supplied from the power system. When designing the grounding system, safety is of the utmost concern. To prevent the power system from malfunctioning due to a natural disaster and/or operational errors that could result in a safety hazard, it would be necessary to analyze and evaluate the related references to ensure that the real mesh voltage and step voltage are performed within a safe range.
This study investigates the usage of computation and designs information to establish appropriate screening criteria and procedures of the self-provided power equipment grounding system for users of 69kV and above. According to the Taiwan Power Company (TPC) guideline “Department of Transmission Line and Substation Projects Substation Grounding System Design Principles” and IEEE Std. 80-2000 “IEEE Guide for Safety in AC Substation Grounding”, the effects of the following parameters, such as earth soil resistivity, ground mesh wire diameter, earth surface resistivity, and surface layer resistance reducing factor, … etc., on eliciting the maximum voltage the human body can tolerate of the step voltage and touch voltage are evaluated. Further, the security of other grounding systems is examined. It is anticipated that these recommended screening criteria and procedures could be as an important reference for both Taiwan Power Company and users. As a result, the evaluation time could be shortened significantly.
Keywords: mesh voltage, step voltage, grounding impedance, soil resistivity.
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