问题
问答题 简答题
对变压器过电压保护的措施有哪些？
答案
参考答案：
（1）外部过电压保护：在变压器旁安装避雷器可以限制高峰值的雷电过电压侵入，但变压器仍要受到峰值低于变压器放电电压的冲击波的作用。
（2）内部过电压保护：主要是增大纵向电容，以改善绕组在冲击电压下的电位分布，设置：
A.采用静电板；
B.绕组采用纠结式绕法；
C.内屏蔽（插入电容）。
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对变压器过电压保护的措施有哪些？
参考答案：
（1）外部过电压保护：在变压器旁安装避雷器可以限制高峰值的雷电过电压侵入，但变压器仍要受到峰值低于变压器放电电压的冲击波的作用。
（2）内部过电压保护：主要是增大纵向电容，以改善绕组在冲击电压下的电位分布，设置：
A.采用静电板；
B.绕组采用纠结式绕法；
C.内屏蔽（插入电容）。
| 阅读理解。 | ||||
| About ten years ago, a young and very successful manager named Josh was traveling down a Chicago neighborhood street. He was going a bit too fast in his expensive new car, 1 was only two months old. He was 2 for kids rushing out from between parked cars and 3 down when he thought he saw something. As his car passed, no child rushed out, 4 a brick (砖) sailed out and-WHUMP!-it smashed (砸向) into the Jaguar XKE's (美洲豹车) shiny black side door! SCREECH...!!!! Josh became very 5 . He drove back to the place from where the brick had been thrown. Josh 6 out of the car, caught hold of the kid and pushed him up against a parked car. He shouted at the kid, "What was that all about and who are you? Just what 7 are you doing?!" Still angry, he went on. "That's my new car and that brick you threw is going to 8 you a lot of money. Why did you throw it?" "Please, mister, please... I'm sorry! I didn't know what else to do!" begged the boy. "I threw the brick 9 no one else would stop!" Tears were running down as he pointed around the parked cars. "It's my brother, mister," he said. "He fell out of his wheelchair and I can't 10 him up." Crying, the boy asked the manager, "Would you please help me get him back into his 11 ? He's hurt and he's too 12 for me." Deeply 13 by his words, the young manager tried hard to hide his feelings. With great effort (努力), he lifted the young man back into the wheelchair and took out his handkerchief (手帕) and wiped the scrapes and cuts (伤口), 14 to see that everything was going to be 15 . He then watched the younger brother push him down the sidewalk toward their 16 . It was a long walk back to his expensive Jaguar XKE-a long and 17 walk. Josh never did 18 the side door of his Jaguar. He kept the dent (痕迹) to 19 himself not to go through life so fast that someone has to throw a brick at him to get his 20 ... | ||||
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