摘要
针对传统电磁式电流互感器绝缘复杂、容易磁饱和以及Rogowski线圈测量精度受骨架材料的温度特性和绕制工艺的影响等缺点,研制出一种仅采用一个低功率电流互感器(LPCT)实现大动态范围电流测量的电子式电流互感器。LPCT的输出经过A/D转换、电光转换,由光纤将高电位侧的电流信息传输到低电位侧;通过低电位侧的信号处理电路,同时提供测量和保护两种信号。试验表明,整套装置的准确度满足IEC 60044-8对0．2级计量和5P20保护电子式电流互感器的要求。通过对装置的温度试验得出:在-30℃-70℃温度范围内,系统的比差变化小于±0．1%,角差变化小于±2′,验证了装置的实用性。
An electronic current transformer based on a low power current transformer （LPCT） is developed to overcome the disadvantages of traditional current transformer for the complexity of insulation, magnetic saturation of coils as well as the measuring accuracy of Rogowski coils that can be influenced by temperature characteristic and manufacturing technology. The output of the LPCT is converted to digital light pulse signal using an active electronic circuit at the high tension side; the signal is then transmitted to the control room through a cable of optic fiber; the measuring and relay channels are provided after the signal processing unit in the control room, Testing results show that the electronic current transformer can meet the accuracy requirement of IEC 60044 8 0.2 class for measuring current transformer and 5P20 class for protective current transformer. Temperature test results show that the ratio error changes within ±0. 1% and phase error within ±2＇ at -30 ℃～70 ℃.
出处
《电力系统自动化》
EI
CSCD
北大核心
2006年第4期98-101,共4页
Automation of Electric Power Systems
关键词
电子式电流互感器
低功率电流互感器
光纤
温度特性
electronic current transformer
low-power current transformer （LPCT）
optical fiber
temperature characteristic
