请问电气方面的“二次原理图”怎么翻译?

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请问电气方面的“二次原理图”怎么翻译?

secondary principle schematics

secondary principle diagrams
参考资料:
有使用说明书和必要的电路图和原理图.
The instrument must be accompanied by instructions manual with the necessary schematics and drawings.
如果可能,掌握各个设备串口的原理图是很有用的.
If possible it is often useful to have a schematic of the serial port of each device in a system.
给出硬件接口电路原理图以及主程序软件流程图.
Gives the principle diagram of the hardware interface circuit and the software flow chart of the main program.

就是单线图:single line diagram