CAJ | 학술논문

频域介电谱响应测试技术广泛应用于评估变压器油纸绝缘系统的老化状态。为突出松弛极化过程及缩短测试时间，首次利用桥式电路和Chirp波形电压对现有的频域介电谱测试技术进行了改进。其中桥式电路用来消除几何电容的主导作用同时测量非瞬时极化过程的介电响应。桥电路的应用使虚导纳成为老化指标，即利于理解极化过程，又能简化系统辨识过程。该技术还采用扫频Chirp波形信号作为电压激励源来缩短测量时间，并设计 Chirp 匹配滤波器来提取Chirp信号的频域信息。测量结果表明，经桥电路测量的虚导纳能够作为老化指标来评估油纸绝缘系统老化状况，并且在10?4~1 Hz的频率范围内，测试仅耗时3.3 h，节省至少7 h测试时间。
빈역개전보향응측시기술엄범응용우평고변압기유지절연계통적노화상태。위돌출송이겁화과정급축단측시시간，수차이용교식전로화Chirp파형전압대현유적빈역개전보측시기술진행료개진。기중교식전로용래소제궤하전용적주도작용동시측량비순시겁화과정적개전향응。교전로적응용사허도납성위노화지표，즉리우리해겁화과정，우능간화계통변식과정。해기술환채용소빈Chirp파형신호작위전압격려원래축단측량시간，병설계 Chirp 필배려파기래제취Chirp신호적빈역신식。측량결과표명，경교전로측량적허도납능구작위노화지표래평고유지절연계통노화상황，병차재10?4~1 Hz적빈솔범위내，측시부모시3.3 h，절성지소7 h측시시간。
Frequency Domain Spectroscopy (FDS) is being widely used to assess oil-paper insulation condition of power transformers. To accentuate the relaxation polarization processes and reduce the measuring time, this paper for the first time utilized a bridge circuit and Chirp waveform voltage to improve the existing FDS method. The bridge circuit was designed with an attempt of eliminating the significant impacts from the geometric capacitance of insulation system whilst measuring the response only from the non-instantaneous polarization processes. This application enables the imaginary admittance to be an ageing indicator to assist in the interpretation of polarization processes and simplify the system identification. Also, the proposed method employed a Chirp excitation waveform for saving measurement time. Also, a Chirp-matched filter was designed to extract the spectrum of a Chirp waveform signal. According to the experimental results, the imaginary admittance response measured by the bridge circuit can provide a direct understanding of the ageing status and the time spent on a single measurement was only 3.3 hours from 10?4Hz to 1Hz, saving measuring time at least 7 hours.