一次變電所之雷擊突波特性分析及其對設備之影響評估

Analysis of Lightning Surge Characteristics in the Primary Substations and Assessment of the Affections on the equipments.

梁興華(Sing-Hua Liang)

指導教授 ： 周至如

國立臺北科技大學/電資學院/電機工程系 優質電力產業研發專班/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00409

摘要

本文探討161kV/69kV一次變電所雷擊突波特性，主要探討雷擊發生於161kV及69kV架空地線及匯流排時，出現於一、二次側不同位置與接地系統之雷突波電流及電壓，並評估其對設備之影響，包括分析系統上不同位置以及電力變壓器接地點之突波電流及電壓。
文中首先運用電磁暫態分析程式(ATP)建構一次變電所模型，然後分析模擬雷擊發生時之特性，模擬條件將考慮前述不同雷擊點、電力變壓器避雷器、負載準位及主變壓器161kV繞組中性點之接地方式。最後，藉由ATP分析結果，進一步評估變電所各設備可能發生之風險，設備仍指匯流排、開關、斷路器、電力變壓器及避雷器等，研究結果顯示一次變電所遭受重度雷擊時，對變電所電力變壓器二次側影響極為嚴重，即使已有安裝避雷器，仍會造成很大的傷害，亟待加強其防護，本研究相關之分析所得數據，可供後續研究加強防護措施之參考。

關鍵字

變電所 ； 避雷器 ； 暫態過電壓 ； 絕緣基準 ； 雷擊

並列摘要

In this thesis, the lightning surge characteristics of primary substation with voltage level 161/69kV are studied. The work mainly aims to analyze lightning current and voltage on the primary and secondary side (161kV side and 69kV side) and grounding system with respect to various lightning points on 69kV and 161kV ground wires and buses.
First of all, modeling of primary substation based on alternative transient program (ATP) is presented. Then, the lightning characteristics are analyzed by ATP simulations for lightning currents and voltages on the different locations of system and on grounding points of power transformers. For the simulation, different lightning points aforementioned, lightning arresters of power transformers, load levels and the grounding type of 161kV winding neutral points of main transformers are all taken into account. Finally, based on the ATP analysis results, the risks on the equipments such as buses, switches, breakers, power transformers and arresters in the substations due to lightning are evaluated. The study results have shown that lightning damages are very severe at secondary side of substation under heavy lightning even though it has lightning arresters, hence further lightning protection is required. The data presented in this thesis is valuable for further study on enhancing lightning protection for primary substation.

並列關鍵字

Substations ； Arrester ； Transient Overvoltage ； Basic Insulation Level (BIL) ； Lightning

參考文獻

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