Abstract: The method for detecting single-phase grounding fault based on the harmonic component of residual current is provided, in which collecting and calculating the phase differences of third harmonic waves relative to the fundamental wave of the residual current in the feeder line, and judging if the phase differences of the residual current in the feeder line is into a threshold range, and judging if there is a suspected grounding fault, and confirming the fault event by judging the duration and the generated times of the suspected grounding fault. Another method for detecting single-phase grounding fault based on the harmonic component of residual current is provided, in which the residual current of neutral point is used.
Type:
Grant
Filed:
October 26, 2009
Date of Patent:
December 23, 2014
Assignees:
Tsinghua University, Alstom Grid UK Limited
Abstract: A multilevel voltage source converter for high voltage DC power transmission and reactive power compensation. The voltage source converter includes at least one phase element including a plurality of semiconductor switches to interconnect a DC voltage and an AC voltage. The voltage source converter also includes at least one auxiliary converter to act as a waveform synthesizer to modify the DC voltage presented to the DC side of the phase element.
Type:
Application
Filed:
February 9, 2009
Publication date:
March 22, 2012
Applicant:
Alstom Grid UK Limited
Inventors:
David Trainer, Ruchira Withanage, Robert Whitehouse, Andrew Cross
Abstract: The method for detecting single-phase grounding fault based on the harmonic component of residual current is provided, in which collecting and calculating the phase differences of third harmonic waves relative to the fundamental wave of the residual current in the feeder line, and judging if the phase differences of the residual current in the feeder line is into a threshold range, and judging if there is a suspected grounding fault, and confirming the fault event by judging the duration and the generated times of the suspected grounding fault. Another method for detecting single-phase grounding fault based on the harmonic component of residual current is provided, in which the residual current of neutral point is used.
Type:
Application
Filed:
October 26, 2009
Publication date:
August 25, 2011
Applicants:
Tsinghua University, Alstom Grid UK Limited