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。

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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。

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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.

数据加载引擎执行数据映射与转换，并被BW Scheduler触发，它发送加载数据的请求给源系统，然后源系统选择数据并传输到BW。

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