首页>
外国专利>
METHOD AND DEVICE FOR EVALUATING THE SECONDARY CURRENT OF A CURRENT TRANSFORMER PRIMARY CONNECTED TO AN ELECTRIC POWER SUPPLY LINE
METHOD AND DEVICE FOR EVALUATING THE SECONDARY CURRENT OF A CURRENT TRANSFORMER PRIMARY CONNECTED TO AN ELECTRIC POWER SUPPLY LINE
展开▼
机译:评估与电源线连接的电流互感器一次电流的二次电流的方法和设备
展开▼
页面导航
摘要
著录项
相似文献
摘要
The invention relates to a method and a system for analyzing the secondary current (J2) of a current transformer (20), the primary side of which is connected into a line (10) of an electric energy supply network. When the current transformer (20) is saturated as the result of a short-circuit on the line (10), a saturation signal (X) indicating this saturation and a polarity signal (P) indicating the polarity of the displacement of the short-circuit current (J1) are generated. The two signals (X, P) are used to select zero transitions of the secondary current (J2), corresponding to the polarity of the displacement of the short-circuit current (J1). After the selected zero-transitions, the secondary current (J2) is extrapolated by a current signal (C), in accordance with its saturation-free curve-shape. The current signal (C) is finally supplied to protective systems, instead of the secondary current (J2).
展开▼