The paper introduces the principle of LD-3 rotor one-point groundingrelay 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
The protection relay monitors the signals of currents real time and has performance characteristics of three-sect current protection, grounding leakage protection and other protections.
该保护继电器实时监控电流信号，具有3段电流保护和接地漏电保护等动作特性。
3
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.