题目内容

变压器差动保护继电器采用比率制动式,可以( )。

A. 躲开励磁涌流
B. 通过降低定值来提高保护内部故障时的灵敏度
C. 提高保护对于外部故障的安全性
D. 防止电流互感器二次回路断线时误动

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比率制动差动保护动作特性的确定必须知道最小动作电流、拐点电流和制动系数。

A. 对
B. 错

比率制动差动保护的动作电流随不平衡电流的增大而增大。

A. 对
B. 错

比率制动差动保护制动特性的斜率越大,灵敏度越高。

A. 对
B. 错

Listen to the conversation between Tom and Yi Fei. Then choose the best answer to each of the questions.听听力,完成下面四道选择题:[音频]1. What does Tom want to know from Yi Fei?

A. If Chinese people like dinner parties.
B. If it is traditional in China to introduce dishes at a party.
C. If Chinese guests would be too embarrassed to cook for others.
D. If Chinese guests would think it impolite to be asked to bring a dish.

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