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

Abstract

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

CLC Number:

TP301

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.

Figures/Tables 15

Figure 1.

Table1

Structural parameters of hollow shunt reactor"

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

Table1

Table2

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Table3

Table4

Table5

Figure 7.

Figure 8.

Figure 9.

Table6

References 16

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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	——

Analysis on Electric Field and Electrodynamics Force of Switching Air-core Reactor

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