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基于RC網絡的相序保護器設計

2512872 2010-12-10 | rar | 603 | 次下載 | 10積分

資料介紹

為解決電動閥門控制系統中存在的三相交流電機反轉問題，提出了一種基于RC網絡的相序保護裝置，描述了電路硬件結構，工作原理和元器件選型方法。保護器通過RC網絡電路對三相電壓信號采樣和移相，經過整流濾波輸出開關信號控制繼電器。結合典型應用案例，根據380 V三相交流電源輸入和負載條件，計算出了電路元器件參數。實驗結果表明，在380 V三相交流系統中，保護器能夠對相序作出正確的判斷。與傳統相序保護裝置相比，電路結構簡單，方便移植。參數稍加改變，也可以應用到其他三相系統。

Abstract:: ?To resolve three-phase AC motor reversal in the electric valve control system，this paper proposes a phase-sequence protective device based on RC networks and describes the hardware construction and working principle as well as the component selection method. Three-phase voltage signal acquisition and phase-shifting were done by RC network circuit，a switch signal was generated to control the relay by the rectifier. According to 380V three-phase AC power input and load conditions in a specific application case，component parameters of the circuit were calculated. The experimental results show that phase-sequence protective device can make right judgments about the phase-sequences in the 380V three-phase AC system. Compared with conventional phase-sequence protective device，this protection has advantages of simple structure and convenient transplantation.Parameters are changed slightly，it can be applied to other three-phase system.