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題 名 | 變壓器過激磁高次諧波對過電流電驛動作特性之影響 |
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作 者 | 許瑞銘; | 書刊名 | 技術學刊 |
卷 期 | 3:1 1988.03[民77.03] |
頁 次 | 頁41-50 |
分類號 | 448.23 |
關鍵詞 | 特性; 高次諧波; 動作; 過電流; 過激磁; 電驛; 變壓器; |
語 文 | 中文(Chinese) |
中文摘要 | 當電力變壓器過激磁時,其鐵蕊會飽和,而得到含有高次諧波的感應電壓波形。本文藉著微電腦系統去執行快速傅利葉轉換,去獲得各次諧波的計算值。由實驗測試結果知當電力變壓器過激磁時,於低值的負載電流下,若其所含的諧波成倍愈大,則過電流 (CO) 電驛的時間動作特性會受到諧渡的影響而有稍許的延時作用。而對於電力系統中變壓器於高值的負載電流下,CO電驛 的時間動作特性較不受諧波存在的影響。因此,當變壓器過數磁現象發生時,CO電驛動作特性受影響的成份甚小,CO電驛能用作變壓器於過激磁下的保護電驛。 |
英文摘要 | When a transformer is used during over-excited conditions, its iron core is saturated and a non-sinusoidal voltage which contains many harmonic waves is produced. The harmonic contents are obtained by FFT analysis using a micro computer. The experimental results show that when the harmonic content is large under low load currents, the effect of delaying the CO relay time operation character is also increased. However, under heavy load currents, the CO relay time operation has a smaller amount of change under the harmonic waves. The paper therefore proposes that a CO relay can be used to protect the transformer from over-excitation. |
本系統中英文摘要資訊取自各篇刊載內容。