1) metallic return operation
单极金属回线方式
1.
In this paper,the characteristic of the main parameters during the process of the line fault in metallic return operation is discussed and confirmed on RTDS first;then,based on the DC protection system of Tian-Guang,Gao-Zhao and Xing-An HVDC transmission projects,the correlative protection is introduced.
单极金属回线方式是直流输电系统中最常见的接线方式之一。
3) monopolar ground circuit operation mode
单极大地回线方式
1.
The analysis of these data shows that the monopolar ground circuit operation mode or the bipolar asymmetric mode of HVDC transmission system has great impact on the noise and neutral line direct current of transformers with earthed neutral point and the harmonic voltag.
列举了天生桥—广州直流输电系统、三峡—广东鹅城直流输电系统、贵州高坡—广东肇庆直流输电系统调试投运期间的大量现场实测数据,并对这些数据进行分析,结果表明直流输电系统单极大地回线方式或双极不对称方式运行时对交流系统中性点接地运行变压器的噪声、变压器中性线直流电流以及电网谐波电压均会产生较大影响,严重时可能损坏电力设备。
5) monometallic wire
单金属线
6) metallic return circuit
金属线回路
补充资料：单极
1.穷尽;竭尽。单，通"殚"。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条