Title :
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
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;
Conference_Titel :
Transmission and Distribution Conference and Exhibition: Asia and Pacific, 2005 IEEE/PES
Conference_Location :
Dalian
Print_ISBN :
0-7803-9114-4
DOI :
10.1109/TDC.2005.1547164
