電力公司有許多發電廠與超高壓變電所，部分場所使用一段時間後，因應周遭環境需求，會在既有設施中另增加新設備，以符合實際所需，本文所探討場所為超高壓開關場內增加新設備。四條345 kV外電線路原無出口端之隔離開關(Disconnected Switch, DS)，在線路出口端各增設一組隔離開關，可增加變電所人員設備操作的靈活性。而原來僅一台啟動變壓器(以下簡稱啟變)供給所內用電，增設二號啟變，使二台啟變達到互為備用功能，上述二種新增設備，已改變原有開關場設備配置。運用電磁暫態分析程式(Electromagnetic Transient Program, EMTP)建立超高壓開關場模型，模擬利用既有設備操作時所造成之開關突波與線路發生雷擊時所產生之雷擊突波，根據模擬結果，比較新增設備之基準開關突波準位(Basic Switching Surge Level, BSL)與基準脈衝絕緣準位(Basic Impulse Insulation Level, BIL)，評估結果不致影響既有開關場之絕緣協調設計理念。。

A power company owns many power plants and extra high voltage (EHV) switchyards. Some power plants and EHV Switchyards after a period of time, because of their surrounding power demands, will add new facilities to their old ones in order to meet the power demands. Thus, the thesis studied the scenario of adding new facilities in an EHV switchyard. The thesis found that four 345kV power lines, which do not have disconnected switch (DS) in their outlets, once added one set of DS to their outlets respectively, this would increase flexibility when switchyard personnel operate facilities. The thesis also found that an EHV switchyard which has only one start-up transformer as its internal power supply, once added another start-up transformer, this would reach mutual backup functions. Those two new facilities mentioned above have changed its outfit of an EHV switchyard. An electromagnetic transient program (EMTP), which was used to establish a model of an EHV switchyard, simulated switching surges by operating its current facilities and lightning surges when a lightning occurs. Based on the results of the simulation and a comparison when new facilities were added, basic switching surge level (BSL) and basic impulse insulation level (BIL) were examined. The results of the examination should not affect its current insulation coordination design of an EHV switchyard.

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