In typical six-phase transmission system, half positive sequence, half zero sequence and half negativesequence fault components are independent of the variance of system impedance.
在典型的六相输电系统中，半正序、半零序和半负序故障分量不受系统阻抗变化的影响。
2
An adaptive impedance relay based on negativesequence voltage polarization is proposed, and its operating characteristic is analyzed.