摘要
为提高低压配电系统一级过电压防护间隙安全可靠性,设计了基于空心阴极效应的浪涌保护间隙（HC-SPG）;测量了在氮气条件下HCSPG的放电电压与工作气压的关系曲线;确定了电压保护水平≤4 kV的HCSPG的工作气压范围。研究表明：在氮气环境中对于间隙距离D和孔径φ均为3 mm时,HCSPG可工作在50-5×10^4Pa的气压范围。随着D的增大,HCSPG的电压保护水平略有下降;在D、φ均为3 mm和气压p=600 Pa的氮气环境中,HCSPG的直流电压（上升梯度〈1 kV/s）保护水平784 V,脉冲电压保护水平2.4 kV,对直流电压和1.2/50μs脉冲电压的响应时间ts分别为25.33和25.4 ns;通流容量经过10/350μs试验,单次电荷转移量Q达到48.26 C,比能量W/R达到2.14 MJ/Ω。研究结果证明了HCSPG应用于低压配电系统一级雷电防护的可行性。
The SPD（surge protective devices） were used as over-voltage protection devices in power system. In this paper, the surge protective gap based on hollow cathode effects was designed, the discharge curves were measured in air and nitrogen gas environment, and the critical pressure range was determined on condition that the voltage protective level Up was less than 4 kV. When the gap distance D and the hole diameter φ of HCSPG （hollow cathode surge protective gap） were all 3 mm, the working gas pressure which satisfy pulsed voltage protective level（Up ： 4 k） was from 5 ×10^1 Pa to 5×10^4 Pa. The experimental result can be derived that increasing the gap distances of the HCSPG can lead to the decrease of Up. While D=φ=3 mm and the nitrogen gas pressure is 6×10^2 Pa, the DC （the rise step of voltage waveform less than 1 kV/s ） voltage protective level and pulsed protective level are 784 V and 2. 14 kV respectively. The transferred charge per impulse produced by 10/350μs pulsed current waveform is 48.26 C, and the ratio energy W/R is up to 2 MJ/Ω. It is testified that the HCSPG can be used as the SPD of class （B） in power system of AC 220 V and 380 V and other circumstances similarly.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2007年第10期25-27,40,共4页
High Voltage Engineering
关键词
空心阴极效应
浪涌保护间隙
电压保护水平
放电特性
响应时间
单次电荷转移量
hollow cathode effects
surge protective gap
voltage protective level
discharging characteristics
response time
transferred charge per pulse
