zero-phase lines

The relations between the pictures and 9 earthquakes Ms> 5.0 which occurred in and around the area during the measurement period are studied too. The earthquakes occurred nearby the zero lines of gravity anomalies.

测区及其周边共发生了9次Ms＞5.0级地震，地震发生在正负异常区变换带的零线附近；

The zero sequence component and the positive sequence component equations of transmission lines are derived on the basis of telegraph equations.

运用电报方程推导出三线－地耦合传输线零序分量和正序分量传输线方程。

The zero-input responses of distortionless lines are analyzed and the analytical expressions are got.

分析了无畸变线的零输入响应，导出了其响应的解析式。

Analysis of the reason of pilot zero sequence directional protection mal-function and study of negative sequence directional element on parallel double-circuit lines

平行双回线路纵联零序方向误动原因分析及负序功率方向研究零序电哩向保护装置

Secondly, the approach that switches the tripping equations to improve the tolerance of grounding resistance is not suitable when the zero sequence reactance relay is applied to double circuit lines or ring network.

零序电抗继电器应用于双回线或环网时，不适宜用切换动作方程的方法提高承受过渡电阻的能力。