摘要
电流零区测量(CZM)系统可以用于评估断路器的开断能力,是电弧机理研究和产品开发、优化的有用工具。首先介绍了零区测量系统的原理以及据此开发的零区测量系统,该系统主要由高采样频率光纤隔离数采仪、分压器、Rogowski线圈和采集控制及数据处理程序组成。定制的分压器和Rogowski线圈经过校验后,可分别用于测量电弧电压和电流。随后将该系统应用于电压等级为252 k V、额定短路电流为50 k A/60 Hz的SF_6断路器的L90试验中,以获取不同燃弧时间的的零区特性数据。测试结果表明:过零前200 ns时刻的电导、过零前电弧电压下降率可以较好地表征SF_6断路器的热开断能力;对于被试断路器而言,过零前200 ns时刻的电导、过零前电弧电压下降率的开断临界值分别为Glim≈1.4 m S,Plim≈2 850 V/μs。该测量系统可对断路器开断能力进行定量测量和评定,将有助于提升高压断路器研发水平。
Current zero measurement（CZM） system can be used to evaluate interruption capability of circuit breakers （CBs）. Thus it is a useful instrument for studying the physical mechanisms during the arcing process, designing and optimizing the products. We put forward the principle of current zero measurement, and introduce a newly-built measurement system based on the former. The measurement system consists of an optic-fiber insulated acquisition equipment with a high rate of sample collection, a voltage divider, a Rogowski coil, and a data management platform. A specialized divider and coil after calibration are employed to output the measurement signals of the arc voltage and current, respectively. Then this system was applied to measure the current zero characteristics of a SF6 CB with a voltage level of 252 kV, a rated short current of 50 kA/60 Hz, under the type test L90 with various arcing durations. Test results show that the are conductivity of 200 ns before current zero and the decreasing rate of arc voltage before current zero can be treated as reasonable indicators of thermal interruption capability of SF6 CBs. The criterions of investigated CB are Glim≈1.4 mS, Plim≈2 850 V/μs, respectively. The measurement system can measure and evaluate the interrupting capability of CBs quantitatively, which will be helpful to improving the level of research and development of high voltage CBs.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第6期2055-2061,共7页
High Voltage Engineering
