Selecting the faulty line through correlation of zero-sequence currents in non-solid earthed network

2006 ◽  
Author(s):  
Lv Yan-ping ◽  
Xing Ya-hui
Keyword(s):  
Zero Sequence

Study on Selective Leakage Protection System of Mine High Voltage Grid Based on Harmonic Phase Comparison

2015 ◽  
Vol 9 (1) ◽  
pp. 253-262
Author(s):  
Liu Zhongfu ◽  
Zhang Junxing ◽  
Shi Lixin ◽  
Yang Yaning
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Neutral Point ◽  
Arc Suppression Coil ◽  
Zero Sequence ◽  
Harmonic Extraction ◽  
Power Direction ◽  
The Stability

As for the wide application of arc suppression coil to the grounding in neutral point of mine high voltage grid, grid leakage fault rules and harmonic characteristics of the neutral point grounding system through arc suppression coil are analyzed, the selective leakage protection program “zero-sequence voltage starts, fifth harmonics of grid zerosequence voltage and zero-sequence current are extracted for phase comparison” is proposed, and corresponding fifth harmonic extraction circuit and power direction discrimination circuit are designed. The experimental results show that the protective principle applies not only to the neutral point insulated power supply system, but also to the power supply system in which neutral point passes arc suppression coil, which can solve selective leakage protection problems under different neutral grounding ways, improving the reliability of selective leakage and guaranteeing the stability of the action value.

Modeling and control of zero-sequence current in multiple grid connected converter

2008 ◽  
Author(s):  
Weihao Hu ◽  
Yue Wang ◽  
Weizheng Yao ◽  
Hailong Zhang ◽  
Jinlong Wu ◽  
...  
Keyword(s):  
Modeling And Control ◽  
Zero Sequence ◽  
And Control
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