摘要
电力系统传统的限制短路电流的方式是加装限流电抗器，但它在系统正常运行时有电压降和能耗。中科院电工所在国家超导中心的支持下，研制了 ２２０ Ｖ／２５ Ａ 桥式超导故障限流器，它由 Ｎｂ Ｔｉ超导磁体、二极管桥路和直流偏压源组成。将其接入电网，当电力系统正常运行时，超导体电阻几乎为零，对电力系统运行无影响；当电网发生短路，超导线圈被自动串入线路，从而限制了短路电流。在 ４２ Ｋ 温度下进行短路试验， 短路电流缩减率达 ４０％ ，有效地抑制了短路电流。
Superconducting fault current lim iters⒙unlike current lim iting reactors⒙w illcontrolshort circuit currents w ithoutadding voltage drop and energy loss to electric pow er system during norm al operation. A 220 V/25 A class experim entalsuperconducting fault current lim iter ⒉ S F C L⒕prototype w ith a diode bridge is developed by the Institute of Electrical Engineering⒙ Chinese Academ y of Sciences⒙under the auspices of the National Center for R & D on Superconductivity of China. The lim iter consists of a Nb Tisuperconducting coil⒙a diode bridge and a bias voltage supply. The device presents noim pedance to the current flow ing through the pow er system during norm al operation. Under short circuit conditions⒙thesuperconducting coil w ill be autom atically inserted into the system and thereby lim its the fault current. W ith thesuperconducting fault current lim iter at 4 2 K tem perature in the test circuit⒙short circuit currents are w elllim ited in half ofa cycle. The short circuit current reduction is 40% .
出处
《电力系统自动化》
EI
CSCD
北大核心
1999年第18期9-11,共3页
Automation of Electric Power Systems
基金
国家超导联合中心资助
关键词
电力系统
超导故障限流器
超导磁体
短路
pow er system s superconducting fault current lim iter ⒉ S F C L⒕ superconducting coil short circuit
