电力机车三相电机微机保护装置研究

On Protecting Device of Three-phase Motors of Electric Power Locomotive Engine by Micro-computer

电力机车三相负载电动机采用接触器控制方式，可用微型单片机同时实现电流速断、反时限过流及单相接地等保护．简要阐述了电力机车三相电机微机保护装置的硬件结构和软件原理．

Contactor control is used by three-phase load motor in electric power locomotive. Current quick-break protection, inverse time over current protection and single-phase grounding protection can be realized by single chip micro-computer. The hardware structure and principle of software of protecting device of three-phase motors by micro-computer were summarized.