The Analysis and Handling of the Impact of Ground Current in DC Transmission on Power Grid Equipment

Author

Dizheng, Kuai ; Da, Wan ; Yun, Zou

Author_Institution

Jiangsu Electr. Power Co. Tech. Center, Nanjing

fYear

2005

fDate

2005

Firstpage

1

Lastpage

4

Abstract

Since the 500 kV DC transmission project was put into service by monopolar link in Dec. 2002, noises of the 500 kV main transformers around WuNan increase significantly (about 21 db). This article discussed the impact of ground direct current produced by DC monopolar link upon equipment in AC system. It includes the impact of DC magnetic biasing on transformers and current transformers, the impact of power grid harmonic on protection relay devices and the corrosion impact of ground DC magnetic biasing on the earthing network in substations. It also proposed the measures of injecting reverse direct current to neutral point of transformers to limit the DC magnetic biasing in transformers

Keywords

DC transmission networks; corrosion; current transformers; earthing; power grids; power system harmonics; power transformer protection; relay protection; transformer substations; 500 kV; AC system; DC magnetic biasing impact; DC monopolar link; DC transmission; corrosion impact; current transformers; earthing network; ground direct current impact; power grid equipment; power grid harmonic; protection relay devices; reverse direct current injection; substations; transformer noise; Corrosion; Current transformers; Magnetic devices; Magnetic noise; Power grids; Power system harmonics; Power system protection; Power system relaying; Protective relaying; Substation protection; Current Transformer; DC magnetic biasing; DC transmission; Grounding network; Harmonic; Relay Protection; Transformer;

fLanguage

English

Publisher

ieee

Conference_Titel

Transmission and Distribution Conference and Exhibition: Asia and Pacific, 2005 IEEE/PES

Conference_Location

Dalian

Print_ISBN

0-7803-9114-4

Type

conf

DOI

10.1109/TDC.2005.1547164

Filename

1547164