Method and device for detecting ground fault of traction converter

Abstract

The invention relates to ground fault detection of a traction converter, in particular to a ground fault detection method and device for a traction converter. The invention solves the problems existing in the existing traction converter ground fault detection method. The detection method of the present invention can detect various ground faults online in real time without shutting down and complicated detection logic, and can distinguish the input ground fault terminals of the four-quadrant rectifier and the U, V, W phase ground fault terminals of the inverter. The detection device of the present invention makes full use of the inherent resources on the locomotive, and only needs to add some detection boards to complete the construction of the detection circuit. Traction converter ground fault detection device, including collecting DC bus voltage U dc The sensor TV1 collects the DC bus negative terminal-to-ground voltage U gnd The sensor TV2 also includes a voltage comparator, a DC bus positive and negative ground fault judgment module, a trigger, a divider, a switch control module, a filter processing module, a multiplier, an integrator, and a four-quadrant inverter ground fault judgment module.

Description

technical field [0001] The invention relates to ground fault detection of a traction converter, in particular to a ground fault detection method and device for a traction converter. Background technique [0002] Traction converter is the core component of train electric transmission system, its high reliability is an important guarantee for the safe and stable operation of trains, ground fault is the most frequent type of fault among various faults of traction converter, generally speaking, single A point ground fault will not affect the operation of the converter, but when two or more point ground faults occur, it will cause a short circuit fault and cause serious damage to the train traction system, and even threaten the personal safety of passengers. Therefore, when a single-point ground fault occurs in the traction converter, how to quickly and accurately detect the ground point in the online state without shutting down is very critical, thereby avoiding the occurrence o...

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problems existing in the existing traction converter ground fault detection method, and provides a traction converter ground fault detection method and device. The detection method can detect various ground faults online in real time without shutting down and complex detection logic. At the same time, it can distinguish the four-quadrant rectifier input ground fault terminal and the inverter U, V, W phase ground fault terminal

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