In the power system, there are high-order harmonic components in the
induction potential of power supply. In addition, due to the
non-linearity of transformers, voltage transformers and other equipment
cores, a series of high-order harmonic components must be included in
the power grid, mainly the fifth harmonic component. For the system
whose neutral point is grounded by arc suppression coil, the inductance
of arc suppression coil to the 5th harmonic wave is 5 times that of the
fundamental wave, and the line capacitance is 1/5 of the fundamental
wave. Compared with the line capacitance, the arc suppression coil is
close to the open circuit state.
因此，5次谐波感性电液压钢坝流保定平面设计培训 保定空调维修 保定管道通风 包装盒定做 化粪池模具 废旧电缆回收 不锈钢铸件 可以忽略，系统单相接地时，5次谐波容性电流分布与中性点不接地系统中基波容性电流几乎相同，籍此可进行故障选线。
Therefore, the 5th harmonic inductive current can be neglected. When the
system is single-phase grounded, the 5th harmonic capacitive current
distribution is almost the same as that of the fundamental capacitive
current in the neutral-point ungrounded system, which can be used for
fault line selection.