Method and device for predicting ground leakage fault of train power supply system

Abstract

The invention discloses a method and device for predicting a ground leakage fault of a train power supply system. The method steps include: S1, acquiring an output signal during the movement of the train power supply system in real time; S2, determining whether there is a ground leakage fault according to the output signal obtained in real time, obtaining the target parameter value of the power supply system in a current fault state and the fault data of the target parameter value if so, otherwise obtaining the degradation data of the target parameter value; and S3, obtaining the fault data and the degradation data of the target parameter value in a specified time period, obtaining the degradation trajectory of the target parameter value, and evaluating the degradation trajectory of the target parameter value to predict the fault state of the power supply system. The device includes a signal acquisition module, a fault real-time monitoring module and a fault status prediction module. The method is easy to achieve, can monitor the ground leakage fault of the power supply system and predict the fault state, and achieves high prediction precision.

Description

technical field [0001] The invention relates to the technical field of train power supply, in particular to a method and device for predicting ground leakage faults of a train power supply system. Background technique [0002] The train power supply system runs through the entire locomotive and passenger car, such as figure 1 As shown, the power supply system in the locomotive adopts AC-DC-AC structure, including rectifier unit, DC power supply unit, inverter output unit, etc. The entire power supply system includes various equipment in the power supply system of locomotives and buses. In the normal state, there is no current flowing in the protective ground. When a ground fault occurs, a circuit is formed, resulting in leakage current, that is, a leakage fault occurs. Since the power supply system is in the working state for a long time, the insulation performance of each equipment in the power supply system will gradually degrade. , if the insulation performance is reduce...

AI Technical Summary

Problems solved by technology

[0004] At present, although there are prediction methods for equipment failure, they are usually based on the failure prediction of a certain key component in the equipment. However, the structure of the train power supply system is complex, the application environment is complex, and there are many failure modes for earth leakage faults, such as figure 2 As shown, there are mainly 8 types of earth leakage faults: rectification side positive terminal (1), rectification side negative terminal (2), reactance front stage (3), DC600V positive output terminal (4), DC600V negative output terminal (5) , the ground faults of phase A (6) on the inverter side, phase B (7) on the inverter side, and phase C (8) on the inverter side. Each type of ground leakage fault has a different location in the power supply system. The fault state prediction of the power supply system cannot evaluate the overall fault state of the power supply system, so the existing fault prediction method based on key components cannot be directly adapted to the train power supply system

Images