RCS－901B和RCS－931B保护、CSC－101B保护，交流电压或电流回路断线

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RCS－901B和RCS－931B保护、CSC－101B保护，交流电压或电流回路断线时如何处理？

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交流电压回路断线时，保护装置自动投退相关保护并发出信号，运行人员应请示值长，退出相关保护压板。RCS－931B保护应将距离保护和零序保护退出运行，且严禁拉合其直流电源。RCS－901B保护和CSC－101B保护应将保护装置退出运行。三相电压正常后，经10秒延时断线信号自动复归。电流回路断线后保护装置自动投退相关保护并发出信号，请示值长将保护装置退出运行。

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计算：-

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+0.05）=-8+1-0.04，这个运算应用了（　　）

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The mountain town of Canton is at an elevation(海拔) of 6,000 feet. It is 1 by thick underbrush and pine trees. Because of six years of drought, thes 2 are a major fire danger. Thousands of trees and tons of underbrush are going to be 3 over the next five years at a minimum cost of $ 3 million. The 4 will be removed first, then the trees will be overturned and removed. A cleared nonflammable area will then 5 surround the town of 4,000. Residents look forward to the work, 6 it will help their town survive a future inferno(地狱). "But there are two 7 ," said one resident. "All the extra trucks are going to make traffic 8 bad. Once the area is cleared, we have to make sure dirt bikers don't try to make the 9 area their personal playground. " A recent fire burned 4,000 acres and destroyed 11 homes in 10 Hamilton. The fire was raging(汹涌)toward Canton, but a sudden rainstorm 11 the fire. Residents know that they won't get lucky twice, so they are 12 this massive clearing operation. Ninety percent of the cutting and clearing will be paid 13 federal funds. Unfortunately, if the trees are on private property, they must be paid for by the residents 14 . Prices can range as high as $1,000 to cut and remove one tree. 15 say that residents can apply for state and federal loans if 16 . "Well, what good does that do me?" asked Thelma, a 65- year-old widow. "I'm living on 17 security. I've got four trees on my property. The government's not going to 18 me money when they know there's no way I can pay it back. 19 what am I supposed to do? These planners with all their big ideas ought to think of the 20 people. "
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