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inrush n.纖入,闖入;流入。 an inrush of fre...

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In order to meet needs of reliability and speediness of power transformer protection , and to have protection blocking reliably in the presence of magnetizing inrush current , the wavelet transform is applied to the discrimination between inrush current and fault current 本文把小波變換應用于勵磁涌流的鑒別,詳細探討了用小波變換來區分勵磁涌流和故障電流的具體方法,提出了兩種比較適用于工程實際的方法。

Based on the mechanism of water inrust at karst collapse column , the factors which affect the rational size calculation of the coal column applied to prevent water inrush are analysed , and the formulas to determine the minimum size of the coal column are obtained 根據巖溶陷落柱突水的力學機理,分析了防突煤柱合理尺寸計算的影響因素;利用巖石強度理論得到了防突煤柱保持穩定所要求的最小尺寸計算公式。

The result shows that inrush identification scheme making use of fuzzy theory overcomes some deficiency of traditional protection , betters performance of transformer relaying , and gives attention to action speed and selectivity of protection 結果表明,利用模糊識別原理構成的涌流識別方案,克服了傳統保護中的某些不足,改善了變壓器保護的性能,兼顧了對保護的動作速度和選擇性的要求。

In view of this fact , a novel method based on identification of winding parameter is presented , which need not to distinguish magnetizing inrush . simulation results by using emtp and matlab demonstrate the feasibility and availability 該方法能有效的區分牽引變壓器內部故障與外部故障、勵磁涌流等情況,用emtp及matlab進行仿真計算,驗證了該方法的可行性和有效性。

In the course of settling new types of transformer microcomputer protection , it is still a key and difficult problem how to prevent protection miss - operating caused by magnetizing inrush when transformer suddenly is closed in no load 在研究新型微機變壓器保護過程中,如何防止變壓器突然空載合閘時出現的勵磁涌流所造成的保護誤動作,仍然是最關鍵和最困難的問題。

The paper analyses the principles of distinguishing internal faults current from inrush current and their defects at the present time on the basis of investigating widely the existing papers on identification of inrush current 本文在廣泛閱讀國內外現有的關于變壓器勵磁涌流識別的文獻的基礎上,分析了目前區分變壓器勵磁涌流和故障電流的多種原理及存在的問題。

According to the characteristics of inrush current a series of new approaches of discrimination inrush current by utilizing fuzzy set is presented . and then the algorithm of transformer protection is achieved based on 80c196 system 通過研究勵磁涌流的特征,提出了利用模糊識別原理來識別變壓器勵磁涌流,并基于80c196單片機系統編制了保護軟件。

According to these characters , water - inrush from coal floor could be hindered through adjusting and controllong the water - inrush condition from coal floor , so that the purpose of preventing the water - inrush from coal floor could be achieved 根據這些特性,可通過調控煤層底板突水條件使之不突水,從而達到煤層底板突水治理并防患于未然的目的。

Abstract : through appropriately changing the water - inrush condition based on mechanical analysis , the potential energy function of water - inrush from coal floor could be derived , which conforms to the catastrophic model 文摘:對建立在力學分析基礎上的突水條件進行適當變換,得到煤層底板突水勢函數,它符合尖點突變模型。

Thermistors - directly heated positive step - function temperature coefficient - part 1 - 3 : blank detail specification ; inrush current application ; assessment level ez iec 60738 - 1 - 3 : 1998 ; german version en 60738 - 1 - 3 : 1999 熱敏電阻.直熱式正階躍函數溫度系數.第1 - 3部分:空白

How to discriminate between internal fault and magnetizing inrush current is the difficulty of transformer protection when apply differential relay 變壓器主保護選擇差動在原理上存在不足,帶來的問題就是如何準確鑒別勵磁涌流與內部故障,這也是目前變壓器保護的難點。

Water - inrush from coal floor is found to have two routes , catastrophic and slowmoving , and to have divergent character and modality softening character and so on 進一步分析,發現煤層底板突水具有突變、緩慢兩條路徑,并在突水臨界點附近具有發散性和4模態軟化等性質。

The simulative test results show that the training speed of nn model designed by this thesis is faster and the identification of magnetizing inrush based on this method is effective 仿真實驗結果表明,用該方法所設計的神經網絡模型訓練速度快,識別效果好。

Thermistors - directly heated positive step - function temperature coefficient - part 1 - 3 : blank detail specification : inrush current application - assessment level ez 熱敏電阻器.直熱式突變型正溫度系數.第1 - 3部分:空白詳細規范:起動電流應用.評估級別ez

Thermistors directly heated positive step - function temperature coefficient part 1 - 3 : blank detail specification inrush current application assessment level ez 直熱式階躍型正溫度系數熱敏電阻器第1 - 3部分:浪涌電流用空白詳細規范評定水平ez

5 . the installation can limit the inrush transient current , which is caused by capacitor banks be put into operation , below 20 times of rated current 5 .裝置應能將電容器組投入運行瞬間產生的涌流限制在電容器組額定電流的20倍以下。

Thermistors - directly heated positive step - function temperature coefficient - blank detail specification - inrush current application - assessment level ez 熱敏電阻.直接熱無源分級功能溫度系數.空白詳細規范.涌電流應用. ez評定級

Connect rails along with china and the world , many new things inrush the entrance to a country , in which certainly also include the diet culture 隨著中國與世界接軌,許多新鮮事物涌入國門,其中當然也包括飲食文化。

However , without theoretical calculation , serious accidents such as the water inrush in shanghai subway line 4 occurred 然而,由于計算理論的不完善,也出現過諸如“上海地鐵四號線透水”的重大工程事故。