摘要
同塔多回线路由于零序互感的影响,当发生接地短路时,接地距离保护的测量阻抗会产生偏差,导致保护误动或拒动。分析计算了同塔四回线在不同运行方式下零序电流补偿系数及其对接地距离保护测量阻抗的影响,并分析了线路不同运行方式下测量阻抗的偏差的特点,进而提出了整定零序电流补偿系数的方法。算例表明,按各方式下最小的零序电流补偿系数来整定,可保证在所有方式下保护至少覆盖线路的50%,保证两侧保护范围有交叉。
The zero sequence mutual inductance among the multi-circuit transmission lines will cause the deviation of the measured impedance of the grounding distance protection,and potentially leading to the protection’s over-reach or under-reach.The zero sequence current compensation coefficient for the quadruple-circuit transmission lines on the same tower is analyzed under different operation modes.According to that,its influence on the measured impedance and the deviation of measured impedance along the lines are also discussed.Finally,a new method to calculate and coordinate the zero sequence current compensation coefficient is proposed.At least half of the line is covered under various operation modes by setting the minimum of all operation modes as the zero sequence current compensation coefficient, ensuring the overlap of protection zone.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第12期1-6,共6页
Power System Protection and Control
关键词
同塔四回线
接地距离保护
零序电流补偿系数
零序互感
测量阻抗
quadruple-circuit transmission lines on a same tower
grounding distance relay
zero sequence current compensation coefficient
zero sequence mutual inductance
measured impedance
