基于DSP的高压容型电气设备介质损耗测量仪设计

针对电气设备易受电网频率波动和非整周期采样的影响,造成介质损耗因数tanδ测量精度和分辨率偏低的问题,提出一种基于DSP的高压电气设备介质损耗因数测量仪设计方案.将归一化工频电压信号和电流信号分别移相90°构成Hilbert变换对,再将两组复信号构造新的复三角信号模型实现对采样信号的去角频率处理.介绍了tanδ测量原理,给出了硬件各主要模块和系统软件实现方案.试验结果表明：该测量装置有效地解决了由于频率波动引起的非同步采样和非整周期截断问题,tanδ实际测量的绝对误差小于0.000 1,具有一定的实际推广价值.

Design of dielectric loss factor measurement with DSP for high voltage capacitive apparatus

Electrical equipment is vulnerable to fluctuations in the network frequency and non-integral period truncation conditions,and caused the dielectric loss factor measurement accuracy and resolution is low.An approach of dielectric loss factor measurement with DSP for high voltage capacitive apparatus is proposed.A Hilbert transform is build through moving voltage or current signals to 90 rad.The two signals are constructed a new complex triangle signal model.Introduced the dielectric loss factor measuring principle.The main modules and hardware system software scheme was given.Simulation and test results show that this algorithm reduced influence of non-synchronized sampling and non-integral period truncation caused by fluctuations in the network frequency.The absolute error of the dielectric loss factor is less than 0.000 1.It has practical application value.