问题 问答题 简答题

对线路故障预测应从哪些方面进行?

答案

参考答案:

应从以下方面进行。

(1)根据系统中性点接地方式以及故障后出现的跳闸或某相电压降低现象确定故障相和故障线路。

(2)根据重合闸装置的动作情况确定故障性质,即为永久性故障还是瞬时故障。

(3)根据保护装置的动作情况确定故障点的大致范围。

(4)结合故障时的天气状况分析可能引起线路故障的原因。

阅读理解

阅读理解。

 

     It was Christmas morning and she felt sorry. "Mr. Harriet, I'm so sorry to bother you today. I think you

 want a rest at Christmas like anybody else. "

     "Please don't worry about that," I said. "Which one is it this time?"

     "It's not one of the dogs. It's. . . Debbie. "

     "Debbie? She's at your house now?"

     "Yes… but there's something wrong. Please come quickly. "

     When I went to Mrs. Ainsworth's home, Debbie was there all right, but this time everything was

 different. She wasn't sitting in her usual place;  she was lying down quietly on her side, and close to her lay

  a little black kitten.

      I examined Debbie carefully while Mrs. Ainsworth looked at me. Her voice seemed to come from

 afar. "Is she ill,  Mr. Harriet?"

      "Yes… yes,  I'm afraid so. She is very ill. " I stood up. "There's really nothing you can do. I'm sorry. "

      Mrs. Ainsworth reached out and touched black Debbie's body. "Isn't it strange? She was dying and

 she brought her kitten here. And on Christmas Day. "

     Tears went down Mrs. Ainsworth's face and she was bright-eyed as she looked at me. "I've never had

 a cat before." She said.

     I smiled. "Well, it looks as though you've got one now. "

     "Debbie would be pleased. " She said.

      I nodded. "Yes,  she would. . . It was just a year ago that she came here,  wasn't it?"

     "That's right. " She looked at the kitten kindly. "The best Christmas present I have ever had. "

1. From the first paragraph, we mainly know_____.

    A. Mrs. Ainsworth was ill                

    B. Mrs. Ainsworth called Mr. Harriet

    C. Mrs. Ainsworth wasn't friendly            

    D. it was Christmas morning

2. Who was ill?

    A. Mrs. Ainsworth.                

    B. Mr. Harriet.

    C. Debbie.                        

    D. One of the dogs.

3. Mrs. Ainsworth's voice seemed to come from afar because _____.

    A. she worried about Debbie                    

    B. she was very ill

    C. she was afraid of Mr. Harriet                

    D. Debbie was dead

4. Which of the following statements is true?

    A. Debbie was one of Mrs. Ainsworth's dogs.

    B. Debbie left home after she sent her kitten to Mrs. Ainsworth.

    C. Debbie brought her kitten to Mrs. Ainsworth before she died.

    D. Mrs. Ainsworth would not like to look after the kitten.

5. The best title of the passage is _____.

    A. The Christmas Cat            

    B. She Tried Her Best

    C. Debbie Went Away            

    D. Mrs. Ainsworth

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