问题 问答题 论述题

论述电能计量装置中电流互感器按分相接法的优缺点。

答案

参考答案:

电流互感器分相接法即电流互感器二次绕组与电能表之间六线连接,若电流互感器星形接法,即电流互感器二次绕组与电能表之间四线连接。星形接法虽然节约导线,但若公共线断开或一相电流互感器接反,会影响准确计量,并且错误接线机率增加,一般尽可能不采用此种接法。分相接法虽然使用导线较多,但错误接线机率相对较低,检查接线也较容易,并且便于互感器现场校验。

阅读理解

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English writer teaches us a lot about life

Charles Dickens is a great British writer in the 19th century. Most of his books are still popular even today.

In 1812, Charles Dickens was born in Portsmouth, England. Dickens didn't like playing with other boys when he was a little child, but he loved reading books. Childhood was not easy for Dickens. He began to work at a factory at the age of 12. Every day, he spent 10 hours washing bottles and cleaning shoes.

When Dickens was 16, he became a reporter for a newspaper. During that time, Dickens wrote his first book, The Pickwick Papers. The book came out in 1836-37 and made Dickens rich and famous. His hard times were at an end.

Most of Dickens' books are about the difficulties of living in Victorian England. The characters(人物)in his books are often children. They usually live a hard life in a boarding(寄宿)school, or have to work in a factory at a young age.

However, Dickens' works are all about hope. He wrote sad and dark stories, but they are always filled with humor(幽默). And most of his stories have happy endings, as with A Christmas Carol. It is about a selfish man. He finds love and friendship after looking back on his life one Christmas Eve.

小题1:Where was Dickens from?

小题2:Was life difficult for Dickens when he was a child?

小题3:What made Dickens rich and famous?

小题4:What do the children in his books usually do?

小题5:Why does the writer say "Dickens' works are all about hope."?

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