问题 问答题 简答题

母差保护CT回路切换不正确的现象及处理方法?有哪些危害?

答案

参考答案:

现象:警铃响,交流回路断线及母差直流回路断线光字牌来,母差保护屏LJS继电器励磁。处理方法:将CT切换连片按正确运行方式切换到正确位置,切换过程中应将母差保护退出运行,首先将CT连片一层投短接位置,严防造成CT二次开路,切换正确后,光子牌消失,LJS继电器失磁,联系值长测差流合格,投入母差保护。危害:母差保护被闭锁母线故障后不能正确动作。

阅读理解

It seems that some people go out of their way to get into trouble.That’s more or less what happened the night that Nashville Police officer Floyd Hyde was on duty.

“I was on the way to a personal-injury accident in West Nashville.As I got onto  Highway 40,blue lights and sirens(警笛)going.I fell in behind a gold Pontiac Firebird that suddenly seemed to take off quickly down the highway.The driver somehow panicked at the sight of me.He was going more than a hundred miles an hour and began passing cars on the shoulder.”

But Hyde couldn’t go after him.Taking care of injured people is always more important than worrying about speeders,so the officer had to stay on his way to the accident.But he did try to keep the Firebird in sight as he drove,hoping another nearby unit would be able to step in and stop the speeding car.As it turned out,keeping the Firebird in sight was not that difficult.Every turn the Pontiac made was the very turn the officer needed to get to the accident scene.

Hyde followed the Pontiac all the way to his destination(目的地).At that point he found another unit had already arrived at the accident scene.His help wasn’t needed.Now he was free to try to stop the driver of the Firebird,who by this time had developed something new to panic about.

“Just about that time,” Hyde said,“I saw fire coming out from under that car,with blue smoke and oil going everywhere.He’d blown his engine.Now he had to stop.”

“After I arrested him.I asked him why he was running.He told me he didn’t have a driver’s license(执照).”

That accident cost the driver of the Firebird plenty---a thousand dollars for the new engine---not to mention the charges for driving without a license,attempting to run away,and dangerous driving.

小题1:The underlined word“panicked”in Paragraph 2 means       .

A.feared

B.hated

C.excited

D.satisfied小题2:The driver of the Firebird suddenly speeded down the highway because         .

A.he was racing with another driver on the road

B.he realized he had to hurry to the accident scene

C.he thought the police officer wanted to stop him

D.he wanted to overtake other cars on the shoulder小题3:Which of the following statements is true?

A.Someone else was taking care of the injured person.

B.The Pontiac reached its destination at the accident scene.

C.Hyde knew where he was going by following the right car.

D.The policeman was running after a speeder on Highway 40小题4:Choose the best title for the passage.

A.Going My Way?

B.Help on the Way?

C.Fun All theWay?

D.Losing His Way?

填空题