摘要
GIS内开关操作产生的快速暂态过电压(VFTO)在传播过程中会诱发瞬态辐射电场,并通过传导或耦合影响变电站二次设备的正常工作,甚至造成设备永久性损坏,研究辐射电场特征规律对变电站二次设备电磁防护具有一定的指导意义。文中研制了一套适用于强电磁环境下电场测量的光纤测量系统,并在TEM小室中进行了标定实验。利用测量系统测量了某1 100 kV和550 kV单相GIS断路器操作产生的辐射电场,分析了电场的时频特性。测量及分析表明:电压等级越高,GIS断路器动作产生的辐射电场脉冲幅值越高、个数越多、衰减越迅速,主频范围分布更广,且多以特定脉冲形式出现。550 kV GIS辐射电场幅值最高可达0.13 kV/m,1 100 kV等级幅值最高可达0.75 kV/m;550 kV等级主频主要分布在5 MHz以下,1 100 kV等级主频主要分布在100 MHz以下。
Operations of switches in GIS will cause very fast transient overvoltage（VFTO）, which can induce transient radiation electric field. By the mode of conduction or radiation, the secondary equipment may be dis- turbed or even permanently damaged. In order to find the different characteristics of E-field amplitude and fre- quency of different voltage, a set of fiber measurement system meeting the required is built up and the calibration test is carried out. The E-fields caused by one 1 100 kV and one 550 kV singe-phase GIS breaker are measured. The result shows： the higher the voltages level, the higher the radiation electric field pulse amplitudes,and the more pulse numbers. The amplitudes of 550 kV GIS and 1 100 kV GIS are 0.13 kV/m and 0.75 kV/m respec- tively. The main frequency distribution range is widened with the voltage increase.
出处
《高压电器》
CAS
CSCD
北大核心
2017年第2期166-171,共6页
High Voltage Apparatus
关键词
GIS断路器
光纤测量系统
辐射电场
时频域分析
VFTO
GIS circuit breaker
fiber measuring system
radiation electric field
time-frequency analysis
VFTO
