Characteristic parameter estimations of EMP energy spectrum

Qin, Fangfang; Mao, Congguang; Wu, Gang; Zhou, Hui

doi:10.1109/apemc.2016.7522976

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…The middle section appears relatively smooth, with the high-voltage port showing significant capacitance to the ground, while the low-voltage port exhibits resonance points of capacitance and inductance to the ground. Additionally, the main energy frequency range of the HEMP conduction environment is 42.4kHz~16.3MHz [19], as depicted in the green grid area in Fig. 3.…”

Section: A Broadband Impedance Measurement Of Transformersmentioning

confidence: 99%

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Broadband Port Circuit Model for Distribution Transformers Based on Frequency Impedance Analysis

Qin,

Chen,

Nie

et al. 2024

IEEE Access

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Building a broadband equivalent circuit model of a transformer is highly significant for studying the characteristics of high-altitude electromagnetic pulse conduction environments in real scenarios and guiding the high-altitude electromagnetic pulse effect tests of power equipment. This paper utilized an impedance analyser to obtain the port impedance characteristics of distribution transformers with two insulation forms and five capacities within the range of 20Hz to 30MHz, based on the concept of passive system circuit modelling. By analysing the impedance characteristics of passive circuit components and observing the trend of changes in the port impedance curve, broadband port circuit models were constructed for both the high-voltage and low-voltage sides of transformers. Model parameter acquisition methods using a combination of function fitting and resonance point characteristics were provided. A high-altitude electromagnetic pulse injection test platform was constructed to verify the accuracy of the transformer model through comparison. Finally, the influence of transformer capacity and insulation form on the parameters of the transformer broadband port model was summarized. The results demonstrate that the proposed broadband port equivalent circuit model is suitable for different types and capacities of distribution transformers and can be employed to investigate the characteristics of high-altitude electromagnetic pulse conduction environments in transmission and distribution lines.

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Section: A Broadband Impedance Measurement Of Transformersmentioning

confidence: 99%

“…Their applicable frequency range is predominantly below 1MHz [16][17][18]. However, the upper limit of the primary energy concentration frequency band in high-altitude electromagnetic pulse transmission environments is approximately 30MHz [19]. This limitation restricts the usage of existing equivalent circuit models.…”

Section: Introductionmentioning

confidence: 99%

Broadband Port Circuit Model for Distribution Transformers Based on Frequency Impedance Analysis

Qin,

Chen,

Nie

et al. 2024

IEEE Access

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“…HEMP is a type of intense electromagnetic pulse interference that can simultaneously interfere with the entirety of a wide-area distribution system. This transmission region, involving thousands of amperes or hundreds of kilovolts, threatens key infrastructure such as electrical and communications systems [16][17][18][19]. The existing research results indicate that HEMP mainly damages power systems with voltage levels below 110kV, especially 10kV power distribution systems.…”

Section: Introductionmentioning

confidence: 99%

Response Characteristics of a ZnO Arrester Under Nanosecond Electromagnetic Pulse

et al. 2024

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Zinc oxide arresters, a major type of overvoltage protection equipment in power systems, can suppress transient lightning overvoltage, operation overvoltage, and other types of power surges. However, the response characteristics and protection effects under nanosecond pulses, such as those in a high-altitude electromagnetic pulse conduction region, remain unclear. Therefore, the surge protection performance of arresters should be properly understood, and high-performance arresters should be developed. In this study, critical parameters, including overshoot peak voltage, residual voltage, response time, and voltammetry characteristics of a representative 10 kV ZnO arrester under nanosecond pulses, were obtained using a double exponential pulse current injection source. The overshoot peak voltage of this arrester under a nanosecond pulse is 2.19 times of lightning impulse residual voltage, and the residual voltage ratio under a nanosecond pulse is 4.31. The average response time is approximately 45 ns, and the response time is independent of the nanosecond pulse amplitude. Furthermore, an electromagnetic transient model of this type of lightning arrester is established based on the CIGRE guidelines, as well as a method to determine the key parameters. The model can simultaneously account for the response characteristics of the small current region and the conduction region of the arrester, which properly agrees with the experimental results.INDEX TERMS ZnO arrester, response characteristics, nanosecond electromagnetic pulse, overvoltage protection, voltammetry characteristics.

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Analysis of Time-Domain Shielding Performance of Enclosure With Apertures Based on Analytic Algorithm

Qin

Sun

Liu

et al. 2019

2019 IEEE 2nd International Conference on Electronic Information and Communication Technology (ICEICT)

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Characteristic parameter estimations of EMP energy spectrum

Cited by 6 publications

References 2 publications

Broadband Port Circuit Model for Distribution Transformers Based on Frequency Impedance Analysis

Broadband Port Circuit Model for Distribution Transformers Based on Frequency Impedance Analysis

Response Characteristics of a ZnO Arrester Under Nanosecond Electromagnetic Pulse

Analysis of Time-Domain Shielding Performance of Enclosure With Apertures Based on Analytic Algorithm

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