摘要
详尽推导了三相电力网的零序网中谐波电流分布情况，分析了影响零序谐波电流的诸因素，指出谐波主要源自于进线的主变压器，其铁芯的非线性是主要因素，获得小电流系统中零序谐波电流按幅值大小排列的次序是基波、５次、７次、１１次、．．．谐波，和实测数据吻合，从而，为零序谐波保护装置的整定提供了理论依据。
This paper presents distribution of harmonic electric current in neutral-ponit-ungrounded systems. Electric transfouners of the supply line are the main sources of zero-sequence hannonic current due to their non-lincarity after analizing various causes. The amplitude orders are base, 5th, 7th, 11th,..., hannonic current from the biggest to smaller, which is showm as the the same as field test results. It provides the theory basis for the tuning of zero-sequence harmonic protodion apparatus.
关键词
谐波
零序电流
电网
harmonic analysis, zero-sequence current,neutral-point-ungrounded systems
