On the same winding , at most three taps can be made to form four transformer ratios , but the difference between maximum current and minimum current should not exceed one time ( for example : 150 - 200 - 250 - 300 / 5a ) 在同一個繞組上最多可三次抽頭,組成四變比,但最大電流與最小電流相差不能超過一倍(如: 150 - 200 - 250 - 300 / 5a ) 。
The rbf network has a better performance , and better forecasting accuracy . then mathematical model of substation voltage / var control is constructed , the squares minimization of voltage differences as target , also considering requirement of voltage and power balance , taking it into consideration that the magnitude constraint of transformer ratio and compensating capacitor , also that constraint of operation times of one day transformer tap and capacitor switch 因此提高了學習性能,具有較好的預測精度。然后,建立變電站電壓無功控制的數學模型,考慮電壓的調壓要求和無功功率平衡,計及變壓器變比和并聯(lián)補償電容的上下限約束,變壓器分接頭和電容器允許的日調節(jié)次數的限制,以電壓偏差的平方和最小為目標函數。
The mechanical impedance analyzing method utilized , the mathematical formula for the input impedance and transformer ratio of ultrasonic horn are built up , some vibration performance of ultrasonic horns are discussed under different load impedance , the relationship and applicational conditions between the transformer ratio of ultrasonic horn and the radiational impedance are analyzed 采用機械阻抗分析方法,建立了超聲變幅器的輸入阻抗和變幅比的數學表達式,討論了不同負載阻抗下超聲變幅器的振動性能,分析了超聲變幅器的變幅比與換能器輻射阻抗之間的關系及應用條件。