Estimation Method of Actual Discharge Quantity Inferred from Ultra-High Frequency Signals in Digital Modeling of GIS

doi:10.16183/j.cnki.jsjtu.2023.374

Abstract

Abstract:

The detection of partial discharge (PD) in gas insulated switchgear (GIS) is an effective method for state assessment and fault diagnosis. The estimation of discharge amount is important in PD detection. The common measurement method is the pulse current method, but it can not be applied online. To solve this problem, this paper proposes a method for estimating the maximum actual discharge based on the quadratic integral value of ultra high frequency (UHF) signal. A method for retrieving the actual discharge of GIS using the UHF signal in a digital model is proposed. First, a GIS digital model, local discharge power source, and UHF sensor model are established. Then, the finite difference time domain (FDTD) method, which is more suitable for large-scale operation, is used to simulate the process of electromagnetic wave propagation stimulated by discharge pulse, and the simulation data is used to verify the rationality of the method in estimating the actual discharge by using the time integral of the UHF signal. The distribution of the electromagnetic field in GIS is also given. Finally, the factors influencing the accuracy of actual discharge estimate are discussed by comparing with the high voltage test results. The findings provide a solution for the inverse analysis of the actual internal discharge in GIS based on the digital model. Compared to the finite element method, this approach offers more advantages in solving time.

Key words: gas insulated switchgear (GIS), partial discharge (PD), ultra high frequency (UHF), partial discharge quantification

CLC Number:

TM595

TAO Ran, SHEN Peifeng, CHEN Ting, LUO Lingen, SHENG Gehao, JIANG Xiuchen. Estimation Method of Actual Discharge Quantity Inferred from Ultra-High Frequency Signals in Digital Modeling of GIS[J]. Journal of Shanghai Jiao Tong University, 2025, 59(6): 800-811.

Figures/Tables 23

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Tab.5

Quadratic integral of apparent discharge and signal under different conditions

激励波形	Q/C	Q²/C²	U_L	$Q U L$ ×10^-10/C	$Q 2 U L$ /C²
高斯脉冲	5.77×10^-12	3.33×10^-23	2.17×10^-22	2.67	1.54×10^-1
	1.15×10^-11	1.33×10^-22	4.33×10^-22	2.61	3.08×10^-1
	2.66×10^-11	7.09×10^-22	1.01×10^-21	2.63	7.01×10^-1
高斯包络	7.73×10^-14	5.98×10^-27	2.83×10^-24	2.74	2.12×10^-3
	7.70×10^-12	5.93×10^-23	2.83×10^-22	2.73	2.10×10^-1
	9.74×10^-12	9.48×10^-23	3.80×10^-22	2.56	2.49×10^-1
	9.78×10^-12	9.57×10^-23	3.80×10^-22	2.57	2.52×10^-1
	1.18×10^-11	1.40×10^-22	4.65×10^-22	2.54	3.01×10^-1

Tab.5

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References 20

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相对角度/(°)	峰值/mV
相对角度/(°)	x=930 mm	x=1 450 mm	x=2 050 mm
0	0.059 0	0.035 8	0.033 9
90	0.034 4	0.029 9	0.021 9
180	0.053 3	0.032 0	0.034 9

相对角度/(°)	累积能量值/μJ
相对角度/(°)	x=930 mm	x=1 450 mm	x=2 050 mm
0	2.130	0.910	0.692
90	0.727	0.667	0.597
180	2.620	0.983	0.832

激励源x轴坐标/mm	探针x轴坐标/mm	Ω	Q₀
0	930	0.086 1	0.074 9
	1 450	0.187 0	0.256 0
	2 050	0.374 0	0.077 1
100	930	0.076 6	0.002 6
	1 450	0.201 0	0.016 9
	2 050	0.293 0	0.086 4
400	930	0.067 2	0.000 4
	1 450	0.172 0	136.000 0
	2 050	0.244 0	613.000 0

激励源x轴坐标/mm	探针x轴坐标/mm	Ω	Q₀
0	930	0.086 5	0.119 0
	1 450	0.185 0	0.256 0
	2 050	0.364 0	0.322 0
100	930	0.076 7	0.007 7
	1 450	0.193 0	0.209 0
	2 050	0.305 0	0.521 0
400	930	0.067 3	3.510 0
	1 450	0.169 0	1.310 0
	2 050	0.244 0	33.900 0