A self-adaptive protection method for diesel locomotive main generator

Abstract

The invention discloses a locomotive main generator self-adaptive protection method. The method comprises the steps that S1, P1 and P2 are preset; S2, in a locomotive main generator running process, the excitation current value I1 of a main generator is detected in real time; and S3, according to excitation current value I1, protection control is carried out. According to the step of S3, if I1 is more than or equal to P1 and the duration of I1 does not reach preset time T1, the output power of the locomotive main generator starts to be reduced; if the duration of I1 does not reach T1 and I1 is less than P1, the main generator carries out normal power output; if the duration of I1 does not reach T1 and I1 is more than or equal to P2, pulse output is directly blocked, and an excitation current overcurrent fault is reported; and if the duration of I1 reaches T1 and I1 is more than or equal to P1, pulse output is blocked, and the excitation current overcurrent fault is reported. The method provided by the invention has the advantages of comprehensive protection, easy operation, high efficiency and the like.

Description

technical field [0001] The invention mainly relates to a diesel locomotive, in particular to an adaptive protection method for a main generator of a diesel locomotive. Background technique [0002] When the main generator of the diesel locomotive is running normally, when the output terminal of the generator or the output rectifier fails, it often causes the peak voltage of the excitation coil to be too high, or the excitation current is too large. If the duration lasts for a long time, the fault at the output terminal of the generator will often expand , The generator coil is burned out, and other equipment in the excitation circuit is burned out at the same time. [0003] At present, the excitation current overcurrent protection method of the main generator is: when the actual excitation current exceeds the set protection value for a sustained period of time, the excitation pulse output is blocked to realize fault protection. The overcurrent protection of the main generat...

AI Technical Summary

Problems solved by technology

[0007] For method (1), the starting point of protection is to protect the main generator excitation controller itself, but not the main generator. When the main generator system is abnormal, if the excitation current is less than the excitation current that the excitation controller itself can bear, it will not Executing protection actions may lead to further expansion of the excitation current, resulting in the spread of faults

This method cannot reasonably protect the main generator according to the actual application, and the degree of protection of the main generator is not enough

[0008] For method (2), technicians need to track the actual required current for a long time, and then set the protection value, and the protection is not comprehensive enough

This method requires long-term investment of human resources and high cost

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