Research on the inversion calculation method of overvoltage based on the nonlinear model of potential transformer

Author

Yan, Lizhi ; Liang, Guishu ; Sun, Haifeng ; Liu, Xin ; Liu, Xixiao

Author_Institution

Key Lab. of Power Equipments Defense of Hebei Province, North China Electr. Power Univ., Baoding, China

fYear

2011

fDate

1-4 Nov. 2011

Firstpage

727

Lastpage

730

Abstract

Monitoring overvoltage is essential to the power system´s operating well. Potential transformer is an important measuring instrument in power station. Because of the high amplitude of lightning overvoltage and switching overvoltage, the iron core of potential transformer reaches saturation in a very short time. The iron core shows nonlinear characteristic, so the distortion of secondary voltage and current happens. This article uses a nonlinear model of 10kV potential transformer to restore the primary voltage from the secondary voltage by the inversion calculation.

Keywords

lightning protection; overvoltage protection; potential transformers; power stations; power system measurement; inversion calculation method; iron core; lightning overvoltage amplitude; nonlinear model; overvoltage monitoring; potential transformer; power station measuring instrument; switching overvoltage; voltage 10 kV; Iron; Lightning; Switches; Transformer cores; Voltage control; Voltage measurement; Voltage transformers; inversion calculation; nonlinearities; overvoltage; potential transformer;

fLanguage

English

Publisher

ieee

Conference_Titel

Lightning (APL), 2011 7th Asia-Pacific International Conference on

Conference_Location

Chengdu

Print_ISBN

978-1-4577-1467-2

Type

conf

DOI

10.1109/APL.2011.6110222

Filename

6110222