摘要
在电子式电流互感器(ECT)的数据采集系统中,模拟积分器用于Rogowski线圈传感器与模数转换器之间,以防止高压电力开关误动作并抑制直流漂移.但由于高压ECT工作于户外环境,其工作环境的温度变化幅度较大(从-40℃到+40℃).这种温度变化会影响模拟积分器的相频特性和幅频特性,进而影响ECT输出信号的角差、比差精度,降低ECT的准确级.为了提高ECT的输出精度,保证ECT符合相关技术标准要求,必须解决环境温度变化影响模拟积分器的相位特性和幅频特性的问题.因此,分析了模拟积分器对ECT角差、比差的影响,提出了利用软件技术对其进行补偿的技术方法.在国家授权检测单位对采用此技术的ECT进行的检测结果证实,此方法可有效地解决上述问题.
In the data acquisition system of electronic current transformers （ECTs）, the analog integrator, located between the Rogowski coil and the A/D converter, is used to prevent the fault actions of high voltage switch and effectively restrain direct current excursion. The permitted working temperature for ECTs ranges from -40℃ to 40℃, because ECTs are designed to work outdoors. This temperature variation will affect the amplitude-frequency and phase-frequency characteristics of the analog integrators, resulting in the low accuracy of the output current and phase displacement, as well as the total accuracy level of the ECTs. To improve the output accuracy and ensure ECTs technical requirements, we use software digital filter to compensate the effects. The test results conducted in a nationally authorized institute proved that this scheme can effectively solve the problem mentioned above.
出处
《应用科技》
CAS
2008年第5期56-59,共4页
Applied Science and Technology
关键词
电子式电流互感器
模拟积分器
比差
角差
electronic current transformer
analog integrator
ratio error
angle error
