问题
问答题 论述题
电气系统局部发热的主要原因有哪些？
答案
参考答案：主要概括为：电网短路或长期过载且保护失灵；电网有集中漏电且保护失灵；接头接触不良，长时通过电流引起温升过高；带油电气设备漏油、受潮致使绝缘水平下降，出现爬电、闪烁，发热电器散热不良，引起异常高温等。
搜题请搜索小程序“爱下问搜题”
电气系统局部发热的主要原因有哪些？
参考答案：主要概括为：电网短路或长期过载且保护失灵；电网有集中漏电且保护失灵；接头接触不良，长时通过电流引起温升过高；带油电气设备漏油、受潮致使绝缘水平下降，出现爬电、闪烁，发热电器散热不良，引起异常高温等。
| 根据短文内容，用方框中所给单词的适当形式填空，每词限用一次。 | |
in a blue 1_______ is good for the mind and body. Blue can 2_______ mean sadness. Someone who is feeling sad may say "I'm feeling blue." Some colors make us feel happy. Orange is such a happy color. It can bring you happiness and cheer you up when you are sad. If you feel 3_______ or weak, please wear colors that make you feel energetic. Green can give you energy, because it 4_______ new life. And you can also wear red. That makes it easier 5_______ you to take action. |