Research on lightning stroke model and characteristics of electronic transformer

Mu Li,Lian Lian Li ,Shu Bo Fang ,Jing Jing Wang

doi:10.1051/matecconf/201816002007

Mu Li, Lian Lian Li + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/201816002007

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Abstract

In order to improve the reliability of power supply, a large number of electronic voltage and current transformers are used in digital substations. In this paper, the mathematical model of the electronic transformer is analyzed firstly, and its circuit model is given. According to the difference of working characteristics between voltage transformer and current transformer, the circuit model of voltage type electronic transformer and current type electronic transformer is given respectively. By analyzing their broadband transmission characteristics, the accuracy of the model is verified, and their lightning analysis models are obtained.

Highlights

In order to improve the reliability of power supply, a large number of electronic transformers are used instead of traditional transformers in the digital substation, so as to avoid the differential saturation, ferroresonance and other risks
We focus on analyzing the lightning stroke model of electronic voltage and current transformer and its lightning characteristics[1,2,3]
Taking voltage transformer as an example, it explains the method of establishing wide band mathematical model of transformer[4,5]

Summary

Introduction

In order to improve the reliability of power supply, a large number of electronic transformers are used instead of traditional transformers in the digital substation, so as to avoid the differential saturation, ferroresonance and other risks. It solves the problem of heavy equipment, inconvenient installation and transportation under the high voltage level. To ensure the safe and reliable operation of the electronic transformer, it is necessary to comprehensively and accurately grasp the characteristics of the over voltage surge in lightning wave shows, according to the characteristics of lightning and risk to develop the corresponding protective measures and strategies. We focus on analyzing the lightning stroke model of electronic voltage and current transformer and its lightning characteristics[1,2,3]

Model of electronic transformer

Mathematical model of electronic transformer

Y1ns 1

Circuit model of electronic voltage and current transformer

Voltage transformer

Conclusion