The behavior principle of DDL protection for DC feeder in DC traction current supply system and the setting principle of protection parameters are introduced and illustrative examples are given.
介绍直流牵引供电系统中直流馈线ddl保护的动作原理，以及保护参数的设定原则，并举例说。
The principle of the relay protection of multi-car's DC traction supply system and the several DC feeder protection methods were presented.
介绍了地铁直流牵引供电系统保护的原理，和所采用的几种直流馈线保护方法。
FTU, as an important component of feeder automation for improving reliability of electricity supply is essential to improve the quality of power supply.
FTU作为馈线自动化的重要组成部分对于提高供电的可靠性改善供电质量来说至关重要。
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