同步輻射研究中心之低壓配電系統對地洩漏電流與地電位分佈之案例研究

A Case Study of Earth Leakage Currents and Ground Potential Distributions of Low Voltage Power Distribution System in The SRRC Plant

黃景一(Jiing-Yi Hwang)

指導教授 ： 周至如

中原大學/工學院/電機工程研究所/碩士(2003年)

https://doi.org/10.6840/cycu200300021

摘要

摘 要

本論文探討同步輻射研究中心(Synchrotron Radiation Research Center, SRRC)之低壓配電系統對地洩漏電流(Earth Leakage Current)及地電位分佈(Ground Potential Rise)之案例，此案例是以電子加速器供電電力系統之電源回路為探討對象。文中首先建立三相五線式配電系統的電路模型，此模型是以「解耦技巧」(Decoupled Technique)為基礎所建立的，可大量簡化電路模型的元件；增加分析的精度。應用此電路模型，文中除對現況的對地洩漏電流及地電位分佈進行分析外，亦探討各種參數的影響，包括負載量變化、三相負載不平衡、接地電阻、中性線及設備接地線等相關參數對地洩漏電流及地電位分佈的影響，分析結果顯示現況的對地洩漏電流主要來自於負載不平衡及中性線多重接地所致，其值可達數安培，地電位可達十餘伏特，在主變壓器的系統接地點，對地洩漏電流及地電位的數據更高。
本文分析的結果與在一些配電盤接地匯流排實地量測的結果相互比較，其數據相當吻合，此顯示本文分析的結果對同步輻射研究中心的接地系統改善具有參考價值。

關鍵字

增能環 ； 儲存環 ； 直線加速器 ； 隔板磁鐵 ； 偏踢磁鐵 ； 特性準直性 ； 鑑別率 ； 偏振

並列摘要

Abstract

This thesis is to study a practical case of Earth Leakage Current and Ground Potential Distribution of Low Voltage Power Distribution System in The Synchrotron Radiation Research Center plant (SRRC). The distribution circuit to be studied is one of the circuits power supplying to the electron beam control system. A circuit model of the three-phase fire-wire distribution circuit is first constructed based on the “Decoupled Technique“ for the simulation. The Decoupled Technique will reduce the dimension of circuit model and increase the precision of simulation results. The simulations of earth leakage currents and potential distribution have done not only for the existent case but also for various affection parameters which include load variations, unbalance three phase loads, grounding resistances and the neutral lines and ground wires associated parameters. The simulation results have shown that the existent earth leakage current, and potentials can attain to several Ampere and over ten volt, respectively, due to the root causes of unbalance load and with multi-grounded neutral line. Higher earth leakage current can be found at the transformer neutral point. The simulation results of earth leakage current is agreement with the measurement data at some panel ground buses. This shows that the analysis results can provide valuable information of improving the performance of grounding system in SRRC.

並列關鍵字

Booster Ring ； Storage Ring ； Linac ； Septum ； Kicker ； Collimation ； Resolution ； Polarization

參考文獻

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