以下为句子列表：
英文: 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.
中文: 摘要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，并举例说明。
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