发电厂厂用电系统及发变组是电力系统运行的重要基础。

Station service electrical system and generator-transformer block is of importance to the operation of power system.

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采用了从一次系统加试验电压的方法进行发变组保护TA、TV回路试验的方法；

The method of adding voltage to the equipment is applied to test the circuit of the TA and TV.

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探讨了发变组保护与发电机励磁系统的一些相关问题，提出了这两个系统协调工作的方法。

This article discussed some relative problems between the generator-transformer protection and the excitation system, and provided the coordination methods of the tow system.

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And I responded to at least one email about this issue, someone quite correctly said tuple are immutable, how can I change one?

我在不止一封邮件里回复了这个问题,一些人很明智，知道元组不可变,但是疑问怎么能去改变他们，我的答案是？

麻省理工公开课 - 计算机科学及编程导论课程节选