【多选题】变压器零差保护相对于反映相间短路的纵差保护来说有()优缺点
A.
零差保护的不平衡电流与空载合闸的励磁涌流、调压分接头的调整无关,因此,其最小动作电流小于纵差保护的最小动作电流,灵敏度较高
B.
零差保护所用电流互感器变比完全一致,与变压器变比无关
C.
零差保护与变压器任一侧断线的非全相运行方式无关
D.
由于零差保护反映的是零序电流有名值,因而当其用于自藕变压器时,在高压侧接地故障时,灵敏度较低
【判断题】变压器差分保护是反映调压器两侧电流差值而动作的保护装置。
【单选题】single choicewhich character means “to talk,word”?
【判断题】CONTENTS 1. Introduction 2. The metaphorical phenomena of English and Chinese 2.1 The same vehicle ha ving the same meaning of the metaphor 2.2 The metaphor having the same meaning with different vehi...
【单选题】single choicewhich character means “to have a rest ” ?
【简答题】试将下面这段文字翻译成中文。 Literal translation and free translation is one of the fundamental issues of translation theory. It is also a starting point for all kinds of translation approaches and studies. When it...
【单选题】变压器差动保护是反映被保护变压器各侧____而确定是否动作的保护。( )
【单选题】single choicewhich character means “ to pray,bless ”?