This paper described the principle of field weakening, analysed the main reason of over-load when field weakening, and gave the countermeasures to prevent over-loading when field weakening.
简要地说明磁场削弱的原理及磁场削弱时产生过载危害的主要原因，提出了防止磁场削弱时过载的措施。
A principle of preventing chain over-load trip based on wide-area information is proposed.
文中提出了基于广域信息的防连锁过载跳闸保护原理。
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