CAJ | 학술논문

介绍了一种基于噪声数字化分析能快速预警变压器潜伏性故障的终端的具体设计。首先,分析了变压器的各种物理量,选择比温度和气体传感器具有更快物理响应特性的声音传感器,以及Delta-Sigma技术的采样芯片来设计硬件；其次,应用数字信号处理技术设计测量分析算法,其中,使用无限脉冲响应(infinite impulse response,IIR)数字滤波器算法计算 Z、C、A频率计权的连续等效声压级,使用实序列快速傅氏变换(fast Fou-rier transformation,FFT)算法分析噪声频谱。对噪声信号模型进行仿真,并使用实验设备进行调试,仿真与实验结果证明该终端具有较高的测量精度,能达到快速预警变压器异常工作状态,适合于智能电网变压器噪声实时监测与保护的场合。
개소료일충기우조성수자화분석능쾌속예경변압기잠복성고장적종단적구체설계。수선,분석료변압기적각충물리량,선택비온도화기체전감기구유경쾌물리향응특성적성음전감기,이급Delta-Sigma기술적채양심편래설계경건；기차,응용수자신호처리기술설계측량분석산법,기중,사용무한맥충향응(infinite impulse response,IIR)수자려파기산법계산 Z、C、A빈솔계권적련속등효성압급,사용실서렬쾌속부씨변환(fast Fou-rier transformation,FFT)산법분석조성빈보。대조성신호모형진행방진,병사용실험설비진행조시,방진여실험결과증명해종단구유교고적측량정도,능체도쾌속예경변압기이상공작상태,괄합우지능전망변압기조성실시감측여보호적장합。
This paper introduces specific design for a kind of terminal for rapid prewarning on potential failure of transform-ers based on noise digital analysis.It firstly analyzes various physical quantities and selects sound sensor of faster physical re-sponse characteristic than that of temperature or gas sensor and sampling chip with Delta-Sigma technology for designing hardware.Secondly,it applies digital information processing technology for designing measuring analysis algorithm among which it uses infinite impulse response digital filter algorithm for calculating continuous equivalent sound pressure levels of Z, C&A frequency weighting and fast Fourier transformation algorithm for analyzing noise frequency spectrum.By simulating on noise information model and using experimental equipments for commissioning,it proves that this terminal is provided with higher measuring precision for realizing rapid prewarning on abnormal working conditions of transformers and suitable for real-time monitoring and protection on transformer noise of the smart grid.