问题 问答题 简答题

什么叫理论损失电量,为什么要进行线损理论计算?

答案

参考答案:

在电网实际运行中,电能表总供电量与总售电量之差值称为线损电量,其中有一部分是输、配电无法避免的,如变动损耗和固定损耗,可以通过计算得出,称为理论损失电量,又称为技术线损。但是在技术线损和不明损失电量中,其电网各元件中损失电量各占多少,无法知道,所以必须根据供电设备参数和实际负荷情况进行计算,算出不明损失电量,从而采取措施,减少损耗。

阅读理解

阅读理解。

     A meteorite (陨石) almost hit an 80-year-old man named Arthur Pettifer in Britain when he was

 working in his garden. The meteorite was the biggest in the past 26 years in Britain.

 The meteorite weighed (重量) one kilo, and might be over four thousand million (百万) years old.

 "I hear the big noise in the air. I looked up and saw the tops of the trees coming and going," he said.

 "I didn't know what it was."

 Meteorites are small things from the small planets in space. About 3,500 meteorites may fall on earth

  every year, but only very few are found. Mr. Pettifer's meteorite is the fifth to fall in Britain since the

 Second World War.

 Mr. Pettifer is glad. "When you think about it coming from so far away, it really is something strange."

1. The meteorite was _____ Mr Pettifer when it fell down.

    A. close to

    B. far from

    C. hitting

    D. coming to

2. The meteorite was already _____ years old.

    A. 40,000,000,000 

    B. 40,000,000

    C. 400,000,000 

     D. 4,000,000,000

3. Mr. Pettifer found the tops of the trees coming and going because _____.

    A. the trees were afraid

    B. the fast falling meteorite kept the tree tops moving

C. it was going to rain

    D. the moving was made by wind

4. _____ people see a meteorite fall although they visit the earth often each year.

    A. Quite a few 

    B. Some 

    C. Few 

    D. Many

5. Mr. Pettifer was _____ to see the falling of the meteorite.

    A. happy 

    B. afraid 

    C. sorry 

    D. angry

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