摘要
介绍了一种基于"分流器+光纤传输"技术的高压直流电流传变系统。与利用铁芯线圈电磁效应的传统直流测量系统原理不同,该系统利用分流器测量直流电流,在高压侧把测量信号转换为光信号,利用光纤将信号从高压侧传输到低压侧,既克服了传统测量暂态性、抗饱和能力较差的缺点,又很好地解决了高低压侧之间的信号隔离问题。由分流器、导电连接等元件组成的一次电流传感器是该系统的关键组件,由于分流器输出为极易受干扰的毫伏级电压信号,在分析了温升、集肤效应、膨胀应力和结构设计等因素对测量精度所造成的影响后,提出了一次电流传感器的实现方案。最后,通过建模仿真和试验验证了该方案设计合理,精度、温升等主要指标满足我国高压直流传变系统的需求。
A HVDC measurement system based on＂shunt ＋ optical fiber transmission＂ technique is introduced,which measures DC current by the shunt,different from the conventional DC measurement system based on the electromagnetic effect of iron-core coil.It converts measurement to optical signal at HV side and transmits it to LV side through optical fiber,which avoids the poor performance of traditional DC measurement in transient and saturation,and provides better signal isolation between HV and LV sides.Its primary current sensor consists of the shunt,conductive connector and other components.The output voltage signal of the shunt is very susceptible to interference,to which a solution is proposed after the influencing factors on measurement accuracy are analyzed：temperature rise,skin effect,expansion stress,structure and so on.Its design rationality is proved by simulation and test,which meets the requirements of HVDC measurement system for accuracy and temperature rise.
出处
《电力自动化设备》
EI
CSCD
北大核心
2012年第2期131-136,共6页
Electric Power Automation Equipment
基金
南京南瑞集团公司资助项目~~
