frequency characteristics of fault 中文意思是什麼

frequency characteristics of fault 解釋
故障頻率特徵
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • characteristics : 產品性能描述
  • of : OF ＝Old French 古法語。
  • fault : n 1 過失，過錯；罪過，責任。2 缺點，缺陷，瑕疵。3 （獵狗的）失去嗅跡。4 【電學】故障，誤差；漏電...
  1. Through analysising the characteristics of the power system with floating neutral point deeply, the paper puts forward a new plan of single - phase to ground fault line selection on the base of s ' s signal injecton method and gives the hardware and software design. in this design, the high speed sampling and data processing is carried out through using dsp processor ; the large electrice current is drived through the application of a high - performance audio power amplifier and transformer ; the communication between host computer and detectors is realized through rs485 bus technology ; the difference multilevel frequency - selected amplifier is designed and the feeble signal of space is sampled on the base of the theory of magnetic induction ; the interface between dsp and exterior chip and rs485 interface logical is designed through using fpga ; the using of lcd module and keyboard interfacing chip makes the interface between human and machine ; the programme of host computer and detectors is designed through using blocking design method

    在本設計中，採用高速的dsp處理器，實現了對故障特徵信息的高速採集與處理;採用大功率的功放晶元與變壓器配合的方法，實現了大電流信號的驅動輸出;採用485總線技術，組建了裝置主機與多探測器之間的主從式通訊網路，實現了多干擾條件下裝置主機與多探測器的可靠通訊;設計了差分式多級選頻放大電路，採用磁感應的方法實現了對空間微弱信號的接收;利用fpga技術，實現了控制器與多外設的介面及數字信號的串並轉換;採用了先進的lcd液晶顯示模塊及鍵盤介面晶元，設計了人機信息交互的介面;採用了模塊化的軟體設計方法，開發了裝置主機及探測器的軟體程序。
  2. The recursive criterion of transient current protection based on mallat wavelet transform is presented in order to meet the real - time demands. the reserch shows deficiency existed in the prevenient principle of transient current protection, so a new improved scheme of transient current protection is proposed. the characteristics of transient protection at different bus distribution capacitance is also analysed in this thesis. the study shows that operate of transient protection is correct when the bus distribution capacitance change. other conclusion include : the trip of transient protection must be locked when the power circuit breaker of transimission line operated, because the trip is incorrect at this time ; the features of transient current and it ' s energy is different between the fault and thunder over - voltage in transimission line, and them can be identified ; the ratio of high frequency component of current in serise capaciters compensation line, svc and hvdc system is far little than fault transient current, so all of them do not affect the working of trasient current protection

    應用功率譜估計方法討論了故障高頻暫態噪聲信號在頻率軸上的分佈情況，利用功率譜分析結果實現的非參數化系統辨識方法研究了母線分佈電容對電流高頻暫態信號的衰減特性。論文的後半部分（第五，六，七章）著重分析了現有基於故障電流的暫態保護原理和判據存在的問題，提出了新的實現方案，並討論了暫態電流保護的運行性能。利用多分辨分析和小波分解快速演算法構成的遞推暫態保護判據，可以準確區分故障線路和非故障線路，實現超高速暫態電流保護，計算更為簡單方便，計算速度更快。
  3. Chaper six compared the emd - based time - frequency analysis method to the typical ' s : short time fourier analysis, wigner distribution and wavelet anlysis, the result showed that the emd - based ' s is better than the others. to weaken the crossing interfere in multi - components signal in wigner distribution the emd - based wigner distribution was proposed and the study result showed that the method is valid. chapter seven built a experiment system at the base of rotor test bed, discussed characteristics of several typical fault in rotating m

    第六章把基於emd的時頻分析方法分別與短時傅里葉變換、 wigner分佈分析、小波變換進行了比較研究，結果表明，基於emd時頻分析方法比上述方法有效；針對wigner分佈分析的交叉項干擾，提出了基於emd的wigner分佈分析新方法，研究結果表明新方法能有效地消除交叉項干擾。
  4. This method uses wavelet transform to pick up the transient fault information because of its multi - resolution characteristics and time - frequency localization nature. fault line is detected based on the modulus maxima or energy comparison under some scale of wavelet transform of phase currents or component current. this method is applicable for such power system as only furnished with ct on two phases, so the shortcoming of other methods presented in recent years is overcome

    即利用相應出線相電流或分量的暫態信息突變量在小波變換某一尺度下模極大值或能量比較來確定故障線路，該方法同樣適用於只裝設兩相ct的小電流接地系統，從而克服了迄今為止提出的一些選線方法在系統只裝設兩相ct時失效的問題。
  5. Firstly, a relevant algorithm is presented for locating single - line - to - ground ( slg ) fault in distribution networks, fault functions are reasoned out and analyzed for single - phase and three - phase distribution lines, and criterion measure, which are based on the frequency, phase and shape characteristics of the fault function spectrums, are also presented for locating slg faults

    首先論文對三相均勻換位線路的故障定位進行了公式推導和數值計算分析，並在頻域內對故障函數的頻譜曲線幅值、相角和頻率特性進行了分析，提出了相應的故障定位判據。
  6. After collecting the characteristics of this signal in frequency domain, the samples are learned to train the constructed wavelet neural network ( wnn ) for realizing the mapping relationship between the fault and the spectrum characteristic, this method can be used for diagnosis of the unit faults efficiently

    在對水電機組振動信號進行頻譜分析后，提取該信號在頻率域的特徵量，將頻譜特徵向量作為學習樣本，通過訓練，使構造的小波神經網路能夠反映頻譜特徵向量和故障類型之間的映射關系，從而達到故障診斷的目的。
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