从电工学基本原理出发，详细讨论了变压器有功功率差动保护原理如何实现的问题。

According to the principle of electrotechnics, how to carry out power differential theory of power transformer is discussed.

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论文从有功功率采样计算公式的基本定义出发，推导出时域谐波有功功率和误差计算公式。

Beginning with the basic definitions of active power, calculation formulas of the active power and it's error in time domain for various harmonic signals is developed.

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论文从有功功率采样计算公式的基本定义出发，推导出时域谐波有功功率和误差计算公式。

Beginning with the basic definitions of active power, calculation formulas of the active power and it's error in time domain for various harmonic signals is developed.

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