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在东风型内燃机车上,为了保护电路内各电器元件不致因接地造成损坏,设置了接地保护线路,当主回路有接地点,接地继电器线圈通过7～10安培电流,DJ动作,切断LC及LLC线圈电路,使牵引发电机失去励磁,从而达到保护电器元件的目的。我们知道,主回路接地一般分为死接地(接地点接死)和瞬间接地两类,现就检查方法谈点看法。1.用兆欧表检查主回路死接地轮检、中检时可能发现主回路接地故障,在运行中也可能发生接地故障,但由于运行中
In the Dongfeng Diesel Locomotive, in order to protect the electrical components within the circuit will not cause damage due to grounding, set the ground protection circuit, when the main circuit has a grounding point, the grounding relay coil through the 7 ~ 10 ampere current, DJ action, cut off the LC and LLC coils Circuit, the traction generator lost excitation, so as to achieve the purpose of protecting electrical components. We know that the main loop grounding is generally divided into dead ground (ground connection then died) and instant grounding two types, now on the method of inspection point of view. 1 with the megger to check the main loop dead ground wheel inspection, inspection may find the main loop ground fault, ground fault may also occur during operation, but due to operation