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东风型机车接地继电器的动作值规定为10A左右。这样接地保护就存在较大的“死区”,使低电位接地往往不能及时发现,因而存在“两点接地”而烧损电机的危险。及时发现低电位接地,并采取相应措施是很必要的。例如:发现低电位接地,但接地继电器未动作,仍可关掉接地的那一组电机,以防止“两点接地”。另外,及时找出接地也是很必要的。本文介绍的低电位接地(牵引电机负端以后的接地)显示的三个电路,经试验证明是可行的。
Dongfeng locomotive grounding relay action is specified as about 10A. This grounding protection there is a larger “dead zone” so that low-potential ground often can not be found in time, so there is “two-point grounding” and the risk of burning the motor. Timely detection of low-potential ground, and take appropriate measures is necessary. For example: Found that the low potential of the ground, but the grounding relay is not moving, you can still turn off the grounding of that group of motors to prevent “two-point grounding.” In addition, the timely identification of ground is also necessary. This article describes the low potential ground (traction motor negative after grounding) shows the three circuits, the test proved feasible.