正弦波参数法测量介质损耗角

Sine Wave Parameters of Law Measured Dielectric Loss Angle

在线监测容性设备的介质损耗是判断其绝缘状况的有效手段。本文以傅里叶级数分离基波相位的方法为依据,通过曲线拟合求频谱幅值最大值处的频率,利用正弦波参数法求该频率处的相位角,从而计算出δ值和tanδ值。该方法不需要复杂的模拟信号处理电路,且能有效地抑制谐波干扰。理论分析和仿真结果表明,这种数字化测量方法检测方便,可以获得较高精度的相位角,因而具有较高的准确度,可实现介质损耗角的在线监测。

To assess the insulation condition of capacitive apparatus,the on-line monitoring of dielectric loss angle is an effective measure.This paper applies Fourier series to detach the fundamental waves phase,adopts the curve fitting to the frequency of the maximum spectrum amplitude,utilizes the sine wave parameters of law to the phase angle of this frequency,calculates δvalue and tanδvalue.The method doesn't require complicated analog signals processing circuit,and it can effectively restrain harmonic interfere...