问答题

为何真空断路器的体积小而使用寿命长？

发布日期：2020-12-11

试题解析

真空断路器

“真空断路器”因其灭弧介质和灭弧后触头间隙的绝缘介质都是高真空而得名；其具有体积小、重量轻、适用于频繁操作、灭弧不用检修的优点，在配电网中应用较为普及。真空断路器是3～10kV，50Hz三相交流系统中的户内配电装置，可供工矿企业、发电厂、变电站中作为电器设备的保护和控制之用，特别适用于要求无油化、少检修及频繁操作的使用场所，断路器可配置在中置柜、双层柜以及固定柜中作为控制和保护高压电气设备用。

中文名: 真空断路器
特点: 体积小、重量轻、适用于频繁操作
国内依据标准: JB/T 3855-2008、DL/T 403-2017

外文名: Vacuum circuit breaker
应用领域: 工矿企业、发电厂

标签：断路器体积小寿命长

查看答案

题王网让考试变得更简单

扫码关注题王，更多免费功能准备上线！

此试题出现在

大学试题

工学

去刷题

其他考试

乡镇临床执业助理医师招标师考试管理软件认证工程师护理正副高助理理财规划师(三级) 中西医结合骨伤学中级肿瘤内科学中级职称口腔执业医师土地估价师公共营养师三级

热门试题热门资讯相关试题

[问答题]Practice 4　　The answer is, in a sense, all in our minds. For the last century, our society’s basic drive has been toward more—toward a bigger national economy, toward more stuff for each of us. And it’ s worked. Our economy is enormous; our houses are enormous. We are living large. All that more is created by using cheap energy and hence built on carbon dioxide (CO2)—which makes up 72% of all greenhouse gases.　　Some pollutants decrease as we get richer. But carbon dioxide consistency tracks economic growth. As Harvard economist Friedman concluded last year, CO2 is “the one major environmental contaminant for which no study has ever found any indication of improvement as living standards rise.” This means that if we’re going to cope with global warming, we may also have to cope with the end of infinite economic expansion.　　That sounds gloomy, but maybe not. New data suggest that we’ve been overstating the issue for many decades. We made an assumption that more was better. It seemed a reasonable thinking. But in recent years, economists, sociologists and other researchers have begun to question that link. Indeed, they’re finding that at least since the 1950’s, more material prosperity has yielded little increase in humans’ satisfaction.

[多选题]以下属于电力系统元件的是（）

[单选题]下列最易合并坐骨神经损伤的是（）

[多选题]在对方程的总（离差）平方和作分解时，下列计算正确的是（　　）。

[问答题]机车周转次数如何计算？

[多选题]下列哪些过程涉及到哪些物理层：（）

[判断题]（）在Word2003中，单元格间距默认为0。