空心电抗器投切下的电场和电动力分析

doi:10.16180/j.cnki.issn1007-7820.2019.03.010

摘要/Abstract

摘要：

针对频繁投切操作对干式空心电抗器绝缘产生的影响,为保障电力系统的安全稳定运行,文中采用仿真和实验分析的方法,对空心电抗器稳态和投切暂态下的电场和电动力进行分析。通过建立基于Maxwell的空心电抗器仿真模型,进一步比较两种状态下电场和电动力的分布特性及数值变化。研究结果表明,投切下的电场强度和电动力较稳态运行下均有明显增大,绝缘厚度需要达到0.032 5 mm才能约束投切过程中产生的径向电动力。投切暂态过程对电抗器绝缘厚度提出了更高的要求,为空心电抗器的工业设计提供了一定的理论依据。

关键词: 干式空心电抗器, 电场分布, 有限元, 电动力, 耦合, 绝缘性能

Abstract:

For the influence of frequent switching operations on the insulation of dry-type air-core reactors, in order to ensure the safe and stable operation of the power system, the simulation and experimental analysis methods were applied to analyze the electric field and electrodynamics force of the reactor under steady state and switching transient state. The distribution and numerical changes of electric and electrodynamics force were further compared under the two states through the establishment of simulation model of Maxwell’s air-core reactor. The results showed that the electric field strength and electrodynamics force under the switching operation were significantly increased compared with that under the steady state operation, and the insulation thickness needed to reach 0.0325mm to constrain the radial electrodynamics force generated during the switching process. The transient switching process imposed a higher requirement for the insulation thickness of the reactor, which provided a certain theoretical basis for the industrial design of the air-core reactor.

Key words: dry-type air-core reactor, electric field distribution, finite element method, electrodynamics force, coupling, insulation performance

中图分类号:

TP301

汪洋,李英娜,李川. 空心电抗器投切下的电场和电动力分析[J]. 电子科技, 2019, 32(3): 47-52.

WANG Yang,LI Yingna,LI Chuan. Analysis on Electric Field and Electrodynamics Force of Switching Air-core Reactor[J]. Electronic Science and Technology, 2019, 32(3): 47-52.

图/表 15

图1

表1

空心并联电抗器结构参数"

参数	数值	参数	数值
额定电压/kV	34.5/ $3$	气道宽度/mm	35
额定电流/A	1 004	总体高度/mm	1900
额定容量/kVar	20 000	层绝缘厚度/mm	0.4
实测电抗/Ω	20.12	支路数	42
最高运行电压/kV	40.5/ $3$	包封数	11

表1

表2

图2

图3

图4

图5

图6

表3

表4

表5

图7

图8

图9

表6

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材料	拉伸强度/MPa	密度/kg·m^-3	泊松比
环氧树脂	300~700	1 100~1 400	0.33
玻璃纤维	3 430	2 540	0.22

分压器	测量位置	示波器输入端	测量内容
D₁	电抗器首端	1	电抗器首端电压(稳态)
		2	电抗器首端电压(暂态)
		3	电抗器两端的差分信号(稳态)
D₂	电抗器尾端	4	电抗器两端的差分信号(暂态)
		5	电抗器尾端(稳态)
		6	电抗器尾端(暂态)

序号	首端对地电压峰值/kV	尾端对地电压峰值/kV	两端电压峰值/kV
1	40.10	20.44	49.89
2	30.17	12.53	40.42
3	38.81	19.63	48.65
4	34.05	25.38	46.67
5	38.29	32.97	53.84
6	22.83	17.81	24.69
7	24.15	19.63	26.53
8	22.81	23.85	24.52
9	30.16	10.46	33.85
10	22.92	26.43	24.91

序号	首端对地电压峰值/kV	尾端对地电压峰值/kV	两端电压峰值/kV
1	42.52	23.72	25.85
2	41.87	24.08	25.37
3	52.27	24.54	59.84
4	40.82	23.11	24.81
5	36.38	22.49	40.82
6	40.53	22.81	24.52
7	41.86	24.12	25.31
8	41.40	23.02	24.76
9	22.80	21.87	25.05
10	40.85	23.21	24.79

运行状态	稳态过程		投切暂态过程
运行状态	径向	轴向	径向	轴向
最大电动力力出现位置	最内层中心高度	第10包封底端	最内层中心高度	第10包封底端
最大电动力力出现时刻/s	——	——	0.01	0.01
最大电动力数值N/匝	6.42	9.38	24.38	36.63
导线受力面积 /mm²	4.91	3.5×10⁴	4.91	3.5×10⁴
压强核算/MPa	1.31	2.68×10^-4	4.97	1.04×10^-3
绝缘厚度最小值/mm	0.008 6	——	0.032 5	——