Influence of ion current on current transfomers of AC systems in near vicinity of DC systems
Influence of ion current on current transfomers of AC systems in near vicinity of DC systems
复制标题
离子电流对直流系统附近交流系统电流互感器的影响
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
T. Keil
中科院分区：
文献类型：
--
作者：
C. Romeis;J. Jaeger;K. Steckler;T. Keil
在一个支撑结构上同时安装直流和交流系统可以增加现有输电走廊的运输能力。直流系统的恒定电场在附近的交流系统中感应出恒定的直流分量。所有的磁性设备，包括铁芯，都有饱和的危险。特别是用于保护问题的电流互感器（CT）可以以减少饱和时间的方式受到影响。因此，保护继电器可能受到不利影响，并且选择性受到损害。本文评估这一重大影响，通过确定的瞬态尺寸因子和饱和的时间在故障电流和电抗器磁通中存在一个恒定的直流分量。对瞬态尺寸因子的影响很小，几乎可以忽略不计。但对于计量铁芯，由于不同的励磁曲线，这可能是一个问题，应该进行测试。
Equipping one support structure with DC and AC systems in parallel can increase the transport capacity of existing transmission corridors. The constant electric field of the DC system induces a constant DC component into the AC systems in near vicinity. All magnetic equipment including an iron core is in danger to saturate. Especially current transformers (CTs) for protection issues can be influenced in the way that the time-to-saturation is reduced. Therefore, maybe the protection relays are affected adversely and the selectivity is harmed. This paper evaluates this major impact by determining the transient dimensioning factor and the time-to-saturation in presence of a constant DC component in the fault current and remanent flux. The influence on the transient dimensioning factor is marginal and can be almost neglected. But for metering cores it could be a problem and should be tested because of the different excitation curves.