secondary harmonic

This paper introduces the fault finding procedure of frequently and secretly trips for circuit breaker at mid-voltage side of a 110 kV substation on the following aspects: secondary circuit, harmonic effect, protective device, etc. A treatment method is also offered as a reference.

针对某110kV变电站主变中压侧开关频繁偷跳的现象，从二次回路、谐波影响、保护装置等方面介绍了故障排查过程，井给出了解决办法。

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The results also indicate that when special filters are connected to secondary three-phase system, the primary harmonic currents decrease by about 28% than by using conventional two-phase filters.

结果还表明，当在二次侧三相系统接入文中提出的特殊滤波器时，谐波电流比用常规两相滤波器降低约28%。

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But inverter has its own inherent characteristics, and the output voltage contains much more high secondary harmonic component.

但是由于逆变器固有的特性，导致其输出电压中含有较多的高次谐波分量。

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Research on national secondary standard and harmonic standard of industrial frequency three-phase electric energy metrology

工频三相电能国家计量副基准和谐波计量标准的研究

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