The paper introduces the principle of LD-3 rotor one-point grounding relay that measures the admittance against the ground.
介绍测量对地导纳原理的LD 3型发电机转子一点接地继电器的保护原理。
2
New principle for feeder grounding fault protection based on zero sequence admittance is presented in this paper. Criterions for the line ground relay with zero sequence admittance are also discussed.