捷運系統主變電站接地系統之開關突波特性分析

A Study on the Switching Surge Characteristics of Grounding System in the Main Substations of Rapid Transit Systems

黃鈺倫(Yu-Lun Huang)

指導教授 ： 周至如

中原大學/工學院/電機工程研究所/碩士(2002年)

https://doi.org/10.6840/cycu200200172

摘要

本文分析捷運系統主變電站接地系統的開關突波特性，即探討捷運系統161kV「氣封絕緣變電站」(GIS)的開關投入時，在主變電站接地系統產生的暫態地電位昇(GPR)、地電位差(GPD)及地面的電磁場及人員的步間電壓與接觸電壓。接地系統的架構是多地網，並有接地引線拉至GIS的接地匯流排，形成立體架構的接地系統。本文將考慮不同條件包括：地網互連與不互連的狀況、接地引線的佈設狀況、開關投入的操作模式、匯流排加壓及主變壓器加壓等狀況，分別分析其接地系統的特性，並以分析結果評估人員與設備的安全。分析結果顯示GIS接地匯流排之GPR及與其他接地點的GPD都可能造成設備的傷害，尤其當接地引線太長或沿著鋼骨佈設或穿於鋼管內最具危險性，對於增強設備對GPR及GPD的防護能力及人員安全改善措施，本文並加以整理以供參考。

關鍵字

接地系統 ； 氣封絕緣變電站 ； 開關突波

並列摘要

In the thesis, the switching surge characteristics of grounding system in the main substations of Rapid Transit System (RTS) are analyzed. The switching surge characteristics to be analyzed include the transient ground-potential-rises (GPR’s) and the ground-potential-differences (GPD’s) between various ground points on grounding system, and the electromagnetic fields and step and touch voltages on the ground surface due to the switching to close in the gas-insulated-substation (GIS) of RTS. The grounding system comprises of multiple ground grids and the ground wires distributed from the ground grids to the ground buses of GIS. The conditions to be considered for the analysis of switching surge characteristics include the states of connection or separation between various ground grids, the ground wires distributions, the operation modes of switching to close and the situations of energizing the bus of GIS and the main transformer.
The issues of personnel and equipments safeties affected by the switching surges are assessed. The analysis results have shown that the transient GPR and GPD on the ground buses may threaten the equipment safety. Especially, the ground wires are dangerous if their routes are along with the steel rebars of building or inner steel pipes or with long distances. The improvement measures for enhancing the equipment protecting against transient GPR and GPD and the measures for improving personnel safety are also presented in the thesis.

並列關鍵字

Switching Surge ； Grounding System ； Gas-Insulated-Substation

參考文獻

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