In the electrotechnics basis theory, it's very convenient to solve one branch's voltage and current by the equivalent transformation between the voltage source and current source.
利用电压源与电流源之间的等效变换求解某一支路电压、电流，是电工基础理论中非常方便的方法。
2
If a transformation fails, then the source row is in error, and that row is written to the source error rows file.
如果转换失败，则源行有错误，该行会写入到源错误行文件。
3
Staging Engine implements data mapping and transformation. Triggered by BW Scheduler, it sends requests to a source system for data loading. The source system then selects and transfers data into BW.