地铁基于干式变压器过负荷保护的研究

Study of Overload Protection Based on Dry-type Transformers in Subway

地铁干式变压器的过负荷保护没有标准的配置方案,国内外保护厂家主要采用基于热曲线特性和反时限特性两种原理配置干式变压器的过负荷保护。通过分析比较热曲线特性和反时限特性过负荷保护的原理及特点,提出干式变压器的过负荷保护方案应根据环境条件综合考虑,为今后地铁工程干式变压器过负荷保护的设计提供参考。

There is no standard configuration solution to overload protection for dry-type transformers in metro system.Two major types are usually adopted home and abroad to configure the dry-type transformers overload protection,which are based on the heat curve characteristics and inverse time characteristic respectively.The paper compared and analyzed the principles and characteristics of the heat curve and inverse-time overload protection.It proposed that environment should be considered in designing dry-type transformer overload protection.