GIS金属法兰孔处的VFTO测量系统设计

doi:10.16180/j.cnki.issn1007-7820.2022.06.012

Abstract

Abstract:

The measurement sensor of the built-in sensor for VFTO is large in size and difficult to install, and cannot be applied to GIS in operation. In order to solve these problems, the VFTO measurement system for GIS metal flange holes is designed. The system adopts the scheme of combining FPC capacitor voltage divider and secondary resistance-capacitor voltage divider to realize VFTO measurement with external miniaturization of GIS. According to the size of the metal flange hole and the performance requirements of the measurement system, the structure and size of the FPC are designed, and the capacitance partial pressure probe is developed. In order to improve the performance of the measurement system, a broadband resistance-capacitance voltage divider is designed, and the matching resistance and the parameters of the coaxial cable are optimized through actual measurement. The results show that the bandwidth of VFTO measurement system is 22.45 Hz~111.45 MHz, and voltage division ratio is 112 790, indicating that the proposed system can accurately trace the source waveform and meet the requirements of VFTO measurement.

Key words: gas insulated switchgear, very fast transient overvoltage, resistance-capacitance divider, capacitive voltage divider, metal flange casting hole, amplitude-frequency response, impulse response, bandwidth

CLC Number:

TP212.1

LIANG Shiqi,ZHANG Wenbin. Design of VFTO Measuring System at the Metal Flange Hole[J].Electronic Science and Technology, 2022, 35(6): 76-82.

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References 21

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性能指标	U₀	22 Ω	30 Ω	50 Ω	100 Ω
M_p/%	45.2	53.1	44.6	34.8	21.1
t_r/ns	3.88	3.47	3.76	4.18	5.01

性能指标	U₀	0.2 m	0.5 m	1 m	2 m
M_p/%	43.07	42.81	44.58	63.43	93.58
t_r/ns	3.91	3.92	3.86	3.65	3.15

试验方式	30 kV	50 kV	100 kV	平均值
雷电分压比	102 588	102 720	102 356	102 555
工频分压比	112 830	112 980	112 560	112 790

Design of VFTO Measuring System at the Metal Flange Hole

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