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.
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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