Simulation of Cable Current Transformers for Protection Against Single-Phase Ground Fault in 6–10 kV Networks

2020 ◽  
Author(s):  
Vladimir Shuin ◽  
Aleksey Evdakov ◽  
Galina Filatova ◽  
Maksim Batmanov
Keyword(s):  
Single Phase ◽  
Current Transformers ◽  
Ground Fault

Methods of Getting Zero Sequence Current in a Single-Phase-to-Ground Fault

2012 ◽  
Vol 614-615 ◽  
pp. 891-894
Author(s):  
Yu Xia Li
Keyword(s):  
Single Phase ◽  
Current Transformer ◽  
Fault Line ◽  
Current Transformers ◽  
Ground Fault ◽  
Electronic Current ◽  
Digital Substation ◽  
Current Transducer ◽  
Zero Sequence ◽  
The Common

After a single-phase-to ground fault, fault voltage and current information should be sampled accurately for automatic equipments to detect the fault line. And zero sequence current is the very key element to detect the fault line after an earth fault happens. The widely used methods of getting zero sequence current are in details described. The common methods are by zoro sequence current transformers, by wye connections of three CTs, and by zero-sequence current transducer. A new method by magnetic field induction and the structure of magnetic induction device are introduced, as well as a new way by electronic current transformer and its application in digital substation.

Research on Single-Phase Grounding Fault in Distribution Networks with a DC Power Positioning Method

2014 ◽  
Vol 530-531 ◽  
pp. 353-356
Author(s):  
Run Sheng Li
Keyword(s):  
Power Distribution ◽  
Single Phase ◽  
Distribution Network ◽  
Distribution Networks ◽  
Power Distribution Network ◽  
Power Outage ◽  
Location Method ◽  
Fault Resistance ◽  
Ground Fault ◽  
Positioning Method

Due to the high ground fault resistance and the complexity of power distribution network structure (such as too many nodes, branches and too long lines), adopting common traveling wave method and ac injection method can not effectively locate the single-phase grounding fault in the distribution network system.To solve above problems and determine the position of the point of failure prisely, this paper adopted the dc location method of injecting the dc signal from the point of failure under the power outage offline. This paper introduces the single phase dc method and the method of three phase dc, and the simulation shows that the dc location method is effective and feasible.

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