针对某变电站10 k V馈线经常发生跳闸的情况,通过分析,认为其跳闸的原因是由于无功补偿装置中并联电容器组的串联电抗器参数设置不合理,在电网中的非线性负荷产生的谐波作用下,引起了并联电容器组的高次谐波电流放大而导致断路器跳闸,...针对某变电站10 k V馈线经常发生跳闸的情况,通过分析,认为其跳闸的原因是由于无功补偿装置中并联电容器组的串联电抗器参数设置不合理,在电网中的非线性负荷产生的谐波作用下,引起了并联电容器组的高次谐波电流放大而导致断路器跳闸,根据实际情况提出了解决的方案。展开更多
This paper reviews the interpretation of impedance and capacitance spectra for different capacitor technologies and discusses how basic electrical characteristics can be inferred from them.The basis of the interpretat...This paper reviews the interpretation of impedance and capacitance spectra for different capacitor technologies and discusses how basic electrical characteristics can be inferred from them.The basis of the interpretation is the equivalent circuit for capacitors.It is demonstrated how the model parameters,such as capacitance and equivalent series resistance,can be extracted from the measured spectra.The aspects of measurement accuracy are exemplarily discussed on the measured spectra.展开更多
针对现有直流变换器增益受寄生参数影响大、输出电容耐压高的缺点,提出一种输出电容串联型高增益直流变换器,所有的电容和输入电源串联起来给负载供电,减小了电容的电压等级;可通过多个单元的扩展,实现更高的增益;介绍了变换器的工作原...针对现有直流变换器增益受寄生参数影响大、输出电容耐压高的缺点,提出一种输出电容串联型高增益直流变换器,所有的电容和输入电源串联起来给负载供电,减小了电容的电压等级;可通过多个单元的扩展,实现更高的增益;介绍了变换器的工作原理和相关参数的计算方法,并在此基础上进行仿真和20 V DC输入的实验样机,结果验证了提出的直流变换器的可行性。展开更多
The glass-ceramic dielectrics and internal electrode structures are investigated for improving the general energy storage density of capacitors. Calculation indicates that glass-ceramics acquired from glass matrix ann...The glass-ceramic dielectrics and internal electrode structures are investigated for improving the general energy storage density of capacitors. Calculation indicates that glass-ceramics acquired from glass matrix annealing at 850℃ for 3 hours can be approximately up to 17 J/cm3 in energy storage density. They are appropriately chosen as the dielectrics for preparing high energy storage density capacitors (HESDCs). A series multilayer structure of internal electrode is developed for the HESDCs, in which each layer is a combination of gold film and silver paste. This electrode structure promises the capacitor immune from the residual porosity defects inevitably brought by electrode paste sintering process, and specifically improves the electrical breakdown strength of the capacitor. Based on this new electrode structure, the energy storage densities of capacitors are increased by more than one order of magnitude compared with those traditional ones with only single layer of internal electrode. Thus, HESDCs based on the optimized glass-ceramic dielectrics can potentially achieve 7.5 J/cm3 in energy storage density, even taking into consideration the enlargement of total capacitor volumes while encapsulating practicable capacitors from dielectrics media.展开更多
文摘This paper reviews the interpretation of impedance and capacitance spectra for different capacitor technologies and discusses how basic electrical characteristics can be inferred from them.The basis of the interpretation is the equivalent circuit for capacitors.It is demonstrated how the model parameters,such as capacitance and equivalent series resistance,can be extracted from the measured spectra.The aspects of measurement accuracy are exemplarily discussed on the measured spectra.
文摘针对现有直流变换器增益受寄生参数影响大、输出电容耐压高的缺点,提出一种输出电容串联型高增益直流变换器,所有的电容和输入电源串联起来给负载供电,减小了电容的电压等级;可通过多个单元的扩展,实现更高的增益;介绍了变换器的工作原理和相关参数的计算方法,并在此基础上进行仿真和20 V DC输入的实验样机,结果验证了提出的直流变换器的可行性。
文摘The glass-ceramic dielectrics and internal electrode structures are investigated for improving the general energy storage density of capacitors. Calculation indicates that glass-ceramics acquired from glass matrix annealing at 850℃ for 3 hours can be approximately up to 17 J/cm3 in energy storage density. They are appropriately chosen as the dielectrics for preparing high energy storage density capacitors (HESDCs). A series multilayer structure of internal electrode is developed for the HESDCs, in which each layer is a combination of gold film and silver paste. This electrode structure promises the capacitor immune from the residual porosity defects inevitably brought by electrode paste sintering process, and specifically improves the electrical breakdown strength of the capacitor. Based on this new electrode structure, the energy storage densities of capacitors are increased by more than one order of magnitude compared with those traditional ones with only single layer of internal electrode. Thus, HESDCs based on the optimized glass-ceramic dielectrics can potentially achieve 7.5 J/cm3 in energy storage density, even taking into consideration the enlargement of total capacitor volumes while encapsulating practicable capacitors from dielectrics media.
