以下为句子列表:
英文: The alternating current supply to UPS for the main telephony equipment will be connected to an essential supply bus so that power can be provided by generators, when necessary.
中文: 主电话设备所用的UPS交流电源将接到基本电源总线,以便需要时由发电机供电。
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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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