铁氧体磁环加装位置对VFTO抑制效果研究*

doi:10.11985/2023.01.029

摘要/Abstract

摘要：

隔离开关开合闸时，会产生高幅值陡前沿的快速暂态过电压(Very fast transient overoltage，VFTO)，可能损坏GIS内部绝缘盆子及二次侧变压器等邻近设备，因此抑制VFTO极为重要。现有学者经研究分析发现铁氧体磁环具有抑制效果好、便于加工和加装的优点，但未对磁环加装位置影响抑制效果做分析。由此针对某1 000 kV GIS，用ATP-EMTP仿真分析出对VFTO危害最严重的三个点：断路器、BUS5端部和BUS1左端，再分析铁氧体磁环加装位置不同抑制VFTO的效果。为铁氧体磁环进一步应用到工程实际中提供参考。

关键词: 快速暂态过电压(VFTO), 铁氧体磁环, 抑制, 隔离开关

Abstract:

VFTO(Very fast transient overoltage) with high amplitude and steep front is produced when disconnector is switched on and off. It is possible to break down GIS internal insulation basin and the secondary side transformer and other adjacent equipment, so it is extremely important to suppress VFTO. Existing scholars have found that ferrite magnetic ring has the characteristics of good suppression effect, easy processing and installation, but the effect of magnetic ring installation position on suppression is not analyzed. Therefore, ATP-EMTP simulation is used to analyze the three most serious points of VFTO for a 1 000 kV GIS: the circuit breaker, the end of BUS5 and the left end of BUS1, and then the effect of different locations of ferrite magnetic ring on inhibiting VFTO is analyzed. It provides reference for further application of ferrite magnetic ring in engineering practice.

Key words: Very fast transient overoltage, ferrite magnetic ring, inhibition, disconnector

中图分类号:

TM863

胡洋, 张文斌, 欧阳娇, 谭清华, 柯毅. 铁氧体磁环加装位置对VFTO抑制效果研究^*[J]. 电气工程学报, 2023, 18(1): 258-264.

HU Yang, ZHANG Wenbin, OUYANG Jiao, TAN Qinghua, KE Yi. Research on the Suppression Effect of Ferrite Magnetic Ring on VFTO[J]. Journal of Electrical Engineering, 2023, 18(1): 258-264.

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测试位置	断路器上	BUS6 10 m处	隔离开关上	BUS5 25 m处
幅值/p.u.	1.70	1.46	1.44	2.06
	2.67	2.38	1.83	1.76
	2.05	1.78	1.43	1.96
测试位置	BUS4 15 m处	BUS3 1 m处	BUS2 10 m处	BUS1 10 m处
幅值/p.u.	1.80	2.01	2.06	1.55
	2.57	2.63	2.21	2.54
	1.54	1.81	1.78	1.46