东风型内燃机车主操作手柄回零位时接地继电器产生动作是较为普遍的现象。这是由于牵引电动机主极绕组或其负端电刷或2C·F电机电枢接地所造成的。本文以牵引电动机6D负电刷接地为例对接地继电器DJ回手柄时动作进行定性分析和初步探讨(图1)。图1是所分析电路的有关部分,假定已出现低电位是A接地。当机车运行时电动机6D负电刷接地,接地继电器DJ When the main operating handle of the DFM diesel locomotive returns to zero, the action of the grounding relay is more common phenomenon. This is due to the traction motor primary winding or its negative brush or 2C · F motor armature ground. In this paper, the traction motor 6D negative brush ground as an example of grounding relay DJ back to the handle when the qualitative analysis and preliminary discussion (Figure 1). Figure 1 shows the relevant part of the circuit under analysis, assuming that a low potential has occurred and that A is grounded. When the locomotive running motor 6D negative brush ground, grounding relay DJ