摘要
为防止雷电波对单相变压器造成损坏,利用冲击电压发生器在不同幅值冲击电压及不同接线方式正反变换雷击过电压对单相变压器测试,并对试验结果进行了频谱分析,获得了单相变压器雷击频域传递特性。试验结果表明,雷电经变压器耦合到低压侧的电压值远高于实际变比感应到低压侧的幅值,正变换过电压冲击电压传递幅值高于反变换过电压。
In order to protect the transformers of secondary system from lightning over-voltage and make sure power system security of service,it is necessary to know the lightning transfer characteristic of single-phase transformers,including the waveform transferred from first side winding to secondary, peak value of lightning voltage in secondary side, and lightning spectrum characteristics of both sides.which could provide useful evidence for the lightning protection and EMC tests of equipments in substation. With the help of impulse voltage generator, single-phase transformers in different impulse voltage value and different connection mode of backward and forward transformation were tested; the lightning transfer characteristics of single-phase transformers were got through the frequency-domain analysis of test results. The results show that the voltage value of lightning coupling to the secondary side through single-phase transformer is much higher than actual transfer ratio, the transfer value of impulse voltage of positive transformation over-voltage is bigger than negative transformation over-voltage.
出处
《水电能源科学》
北大核心
2009年第5期204-206,210,共4页
Water Resources and Power
关键词
单相变压器
配电网
传变特性
冲击电压发生器
频谱分析
过电压
single-phase transformer
distribution network
transfer characteristics
impulse voltage generator
frequency-domain analysis
over-voltage
