摘要
实现自适应重合闸的方法已经很多,但是将输电线贝瑞隆模型应用其中的,国内外还没有见到,因此提出了基于贝瑞隆模型的特高压长线路单相自适应重合闸的新原理。具体方法是在单相重合前,保护使用贝瑞隆模型计算线路故障点两侧的电流,进而求出故障点处的潜供电流,然后根据其有无,来区分线路是永久性故障还是瞬时性故障,从而达到避免重合于永久性故障的目的。通过仿真表明,该原理区分度大,耐受过渡电阻能力强,并且对测距精度不敏感。因为线路越长,电压越高,输电线故障后潜供电流越大,所以该原理在特高压长线路上具有较强的实用价值。
We proposed the self-adaptive reclosure with the Bergeron model for UHV long transmission lines. The relay can calculate the current of both sides of fault point using the Bergeron model before single-phase reclosure, and get the secondary arc current of fault point. Finally the relay can identify that the line has transient faults or permanent faults by the value of secondary arc current. Simulation results confirm that this principle has good identification ability, can endure great fault resistance, and is not sensitive to fault locating accuracy. Longer transmission lines requre higher voltage and the greater secondary arc current,so the principle has more practical value for UHV transmission lines.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第5期1005-1008,共4页
High Voltage Engineering
关键词
自适应重合闸
贝瑞隆模型
故障识别
潜供电流
特高压线路
瞬时性故障
永久性故障
self-adaptive reclosure
Bergeron model
fault identification
secondary arc current
UHV transmission lines
transient faults
permanent faults
