【摘要】 为在线监测tanδ,比较研究不同方案后 ,确定了基于过零比较法原理的设计方案 ,用双极性过零整形 ,并通过软件编程实现数字滤波、过零整形、逻辑与和计算 ,克服了因模拟滤波器滤波不彻底或零点漂移等影响 ,且能有效抑制高次谐波、直流、白噪声 ,将误差控制在角度的分辨率之内。更多还原

【Abstract】 Dielectric loss can reflect the insulation status of capacitance equipment, to get the on-line insulation result of tan δ, a new method based on crossing zero comparative method is schemed out with lots of studies on different methods. In this method, sieving wave, crossing zero integer, logic and calculating tan δ are processed in matlab. Using this method, the influences of zero point excursion, hypo-harmonic, direct current and white noise can be restrained. The error is smaller than the resolution of angle.更多还原