(一)目前接地保护电路的弊病东风型内燃机车的接地保护电路是由一个接地继电器、接地电阻和接地刀闸组成的,如图1所示。接地保护电路的一端接于反向器,另一端接地(接于机体)。当主回路接地时,如图1的A点,由于AB之间存在电位差,使接地继电器线圈有电动作,断开主发电机F的激磁电 (A) the shortcomings of the current grounding protection circuit Dongfeng diesel locomotive grounding protection circuit is composed of a grounding relay, grounding resistance and grounding knife gate, as shown in Figure 1. Ground protection circuit connected to the inverter at one end, the other end of the ground (connected to the body). When the main circuit is grounded, as shown in Figure 1 point A, due to the potential difference between the AB, so that the ground relay coil has an electric action, disconnect the excitation of the main generator F