问题 问答题 简答题

隔离开关在操作时应遵循什么操作原则?

答案

参考答案:

操作时要先拔出定位销,分、合闸动作要果断、迅速,终了不能用力过猛,操作完毕一定要用定位销销住,并目测其动触头位置是否符合要求。

用绝缘棒操作单级隔离开关时,合闸应先合两边相,后合中间相。分闸与此相反。

不管是合闸操作还是分闸操作,都应在不带负荷或负荷在隔离开关允许的操作范围之内进行。为此,操作隔离开关之前,必须先检查与之串联的断路器,应确实处于断开位置。如隔离开关带的负荷是规定容量范围内的变压器,则必须先停掉变压器全部低压负荷,令其空载之后在拉开隔离开关,送电时,先检查变压器低压侧主开关确在断开位置,方可合隔离开关。如果发生了带负荷分或合隔离开关的误操作,则应冷静地避免可能发生的另一种反方向的误操作。

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Anyone who doubts that children are born with a healthy amount of ambition need spend only a few minutes with a baby eagerly learning to walk or a headp toddler starting to talk. No matter how many times the little ones stumble in their initial efforts, most keep on trying, determined to master their amazing new skill. It is only several years later, around the start of middle or junior high school, many psychologists and teachers agree, that a good number of kids seem to lose their natural drive to succeed and end up joining the ranks of underachievers. For the parents of such kids, whose own ambition is often inseparately tied to their children’s success, it can be a bewildering, painful experience. So it is no wonder some parents find themselves hoping that ambition can be taught like any other subject at school.

It’s not quite that simple. "Kids can be given the opportunities, but they can’t be forced. " says Jacquelynne Eccles, a psychology professor at the University of Michigan who led a study examining what motivated first-and seventh-graders in three school districts. Even so, a growing number of educators and psychologists do believe it is possible to unearth ambition in students who don’t seem to have much. They say that by instilling confidence, encouraging some risk taking, being accepting of failure and expanding the areas in which children may be successful, both parents and teachers can reignite that innate desire to achieve.

Dubbed Brainology, the unorthodox approach uses basic neuroscience to teach kids how the brain works and how it can continue to develop throughout life. The message is that everything is within the kids’ control, that their intelligence is malleable.

Some experts say our education system, with its p emphasis on testing and rigid separation of students into different levels of ability, also bears blame for the disappearance of drive in some kids. Some educators say it’s important to expose kids to a world beyond homework and tests, through volunteer work, sports, hobbies and other extracurricular activities. "The crux of the issue is that many students experience education as irrelevant to their life goals and ambitions. " says Michael Nakkula, a Harvard education professor who runs a Boston-area mentoring program called Project IF (Inventing the Future), which works to get low-income underachievers in touch with their aspirations. The key to getting kids to aim higher at school is to tell them the notion that classwork is irrelevant is not true, to show them how doing well at school can actually help them fulfill their dreams beyond it. Like any ambitious toddler, they need to understand that they have to learn to walk before they can run.

Some experts suggest that many kids lose ambition in school because they are ().

A. cut off from the outside world

B. exposed to school work only

C. kept away from class competition

D. labeled as inferior to others