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。
The paper introduces the principle of LD-3 rotor one-point grounding relay that measures the admittance against the ground.
为改善地面操作起重机的起动、点动运行性能，可选用绕线型电动机加外延时继电器控制。
Slip-ring motor can be used in conjunction with time delay relays for floor operated cranes to improve their travelling quality during start and inching.
对受端继电器，提出仅利用保护安装处的电压变化值构成同相点切换判据，可以有效降低系统参数的影响。
For the receiving end, a new switching criterion based on the bus voltage is described, which is immune to the system parameters.
电脑板采用继电器输出，无需中间继断器减少了故障点，维修检测方便。
Relay output is used for the computer panel, medial relay is not necessary, reduced malfunctions and make maintain and inspecting convenient...
电脑板采用继电器输出，无需中间继断器减少了故障点，维修检测方便。
Relay output is used for the computer panel, medial relay is not necessary, reduced malfunctions and make maintain and inspecting convenient...
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