頻率急降 的英文怎麼說
中文拼音 [bīnlǜjíjiàng]
頻率急降
英文
frequency breakdown-
Abstract : the paper presents the study on problems of self - excitation ， over - voltage ， frequency and voltage stability ， organizational measures and arrangement in the course of black start and restoration of the system. through simulation of black start on east china power system ， above problems are analyzed and solved ， it shows that working out strict black start scheme may not only speed up system restoration ， reduce outage losses ， but also have important significance to emergency release or power system islanding
文摘:研究電力系統黑啟動的過程及恢復中存在的自勵磁、過電壓、頻率和電壓穩定、組織措施及安排等問題，並通過華東系統黑啟動模擬對上述問題進行分析和解決，證明制定嚴格的黑啟動計劃不僅可以迅速恢復系統、降低事故損失，而且對處理緊急狀態或地區性解裂有重要意義。In the early 70 " s, the usd - centred international currency svstem collapsedo and the majority of western countries began to carrv out the floating - rate svstem. thus the rate fluctucates frequently subject to no limits. for example, the l ' sd rate once jumped to a very high point and then dropped down again during the 80 " s
70年代初期，以美元為中心的國際貨幣體系崩潰以後，西方主要國家先後實行了浮動匯率制度。從此，匯率的變化不再受什麼約束，波動頻繁。比如1985年2月以後的三、四年間，美元匯率從高峰急劇而持續下降，貶值達50以上， 1989年又一度大幅回升。
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