地下超高壓變電所接地系統開關突波特性及其影響研究

A Study on the Switching Surge Characteristics and Their Affections on the Grounding System in the Underground Extral-High Voltage Substation

鄒國彥(Kuo-Yan Chou)

指導教授 ： 周至如

國立臺北科技大學/電資學院/電機工程系研究所/碩士(2008年)

https://doi.org/10.6841/NTUT.2008.00284

摘要

地下超高壓變電所是將各種電力設備設置在地下不同樓層形成立體式架構，因土地面積有限難以建構大型接地網，必須廣設接地匯流排及接地引線，接地功能是否良好由接地匯流排、接地引線與地網的特性共同決定，其中它們的開關突波特性，對所內人員及各種設備的安全影響極大，亟須加以探討。

為此，本論文之主要目的在探討地下超高壓變電所接地系統之開關突波特性，以斷路器或開關動作切換時在接地系統所造成的突波為研究重點。首先採用電磁暫態分析軟體(EMTP/ATP)建立電路模型，並分析變電所一、二次側輸電線路及匯流排因開關操作所產生注入於接地系統的突波電流。並根據突波電流注入變電所地網之數據，進一步應用接地系統分析軟體(CDEGS)分析各項電磁特性，以評估接地系統之電磁特性對所內外人員、系統及設備影響的程度，並介紹一些改善策略以供參考。

關鍵字

地下超高壓變電所 ； 接地系統 ； 開關突波 ； 電磁特性

並列摘要

Underground Extra High Voltage (EHV) substation installs various electrical equipments on different floors to form a cubic structure. However, the land area is too limited to construct large grounding grid, so many grounding bus and grounding conductors must be widely installed. The grounding system performance will depends on the grounding buses, grounding conductors and the characteristics of ground gird altogether, where the switch surge characteristics bring rather significant influence on the safety of personnel and various facilities in substation, and are to be studied further.

Therefore, this thesis aims to study the characteristics of switching surges in the underground EHV substation and stress on surges in grounding system caused by operations of circuit breakers or switches. The circuit model used to analyze surge currents is first constructed by the electromagnetic transient program (EMTP/ATP). Then, the injection currents to grounding system due to the switching actions on the primary and secondary transmission lines and buses are analyzed. Furthermore, based on the analysis results of switching surge current injected into the ground grid of substation, various electromagnetic characteristics of grounding system are analyzed by a software package namely CDEGS (Current Distribution, Electromagnetic-Field, Grounding and Soil-Structure). Finally, the influences of electromagnetic characteristics of grounding system on the personal, equipments and systems in substation are evaluated, and some mitigation stratogies are introduced to provide as references.

並列關鍵字

Underground EHV Substation ； Grounding System ； Switching Surges ； Electromagnetic Characteristics

參考文獻

[10] 黃鈺倫，捷運系統主變電站接地系統之開關突波特性分析，碩士論文，私立中原大學電機工程學系，中壢，2002。

[24] 溫茂廷，特高壓地下環路接地系統開關突波特性研究，碩士論文，私立中原大學電機工程學系，中壢，2006。

[28] 陳哲樟，超高壓變電所內外接地故障之電磁特性研究，碩士論文，私立中原大學電機工程學系，中壢，2007。

[2] F. de la Rosa, R. Valdivia, H. Perez, J. Loza, “Discussion about the Inducing Effects of Lightning in an Experimental Power Distribution Line in Mexico,” IEEE Trans. on Power Delivery, Vol. 3, No. 3, July 1988, pp. 1080-1089.

[3] W. Xiong, F. P. Dawalibi, “Transient Performance of Substation Grounding Systems Subjected to Lightning and Similar Surge Currents,” IEEE Trans. on Power Delivery, Vol. 9, No. 3, July 1994.