设计了一种集成电路型具有二次五次谐波制动的变压器差动继电器。

An integrated-circuit transformer differential relay including secondary and fifth harmonics suppressor is designed.

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准确提取五次谐波信号和较灵敏的检测漏电保护启动值是谐波方向型高压电网漏电保护需要考虑的关键因素。

Extract the 5th harmonic signal accurately and More sensitive detection leakage protection launched is the key factor in harmonic direction type of HV distribution networks leakage protection.

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实验结果表明，在钢琴的中低音区，不论是单键发音，还是三度和声、五度和声或三度和弦，令第七、第九次谐波的幅度衰减，均能使钢琴声音的音质有所改善。

The result shows that, in the bass and median tone of piano, the timbre will be improved if the 7th and 9th harmonics are attenuated for either single-key, third harmony, fifth harmony or triad chord.

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