A New Transient-Based Earth Fault Protection System for Unearthed Meshed Distribution Networks

2020 ◽  
pp. 1-1
Author(s):  
Juan DIEGO Riospenaloza ◽  
Alberto Borghetti ◽  
Fabio Napolitano ◽  
Fabio Tossani ◽  
Carlo Alberto Nucci
Keyword(s):  
Distribution Networks ◽  
Protection System ◽  
Earth Fault ◽  
Fault Protection

scholarly journals EARTH FAULT PROTECTION IMPROVEMENT ON DISTRIBUTION NETWORKS

2020 ◽  
Vol 2020 (5) ◽  
pp. 54-61
Author(s):  
V.F. Syvokobylenko ◽  
◽  
V.A. Lysenko ◽  
Keyword(s):  
Distribution Networks ◽  
Earth Fault ◽  
Fault Protection

scholarly journals Adaptive functions in G0> and YY0 earth fault protection

2018 ◽  
Vol 19 ◽  
pp. 01018
Author(s):  
Józef Lorenc ◽  
Krzysztof Łowczowski ◽  
Bogdan Staszak
Keyword(s):  
Protection System ◽  
Control Algorithms ◽  
Two Phase ◽  
Medium Voltage ◽  
Earth Fault ◽  
Fault Protection ◽  
Decision Algorithms

In this paper, the benefits resulting from the application of YY0 and G0> earth fault protection with adaptive functions − limiting the risk of outsiders being shocked and reducing the likelihood of two-phase short-circuiting with the ground, are presented. The possibilities of improving the effectiveness of admittance protection by introducing special adaptive functions in control algorithms of station automation and decision algorithms of YY0 and G0> criteria are shown. The rules for using such functions have been described and it has been shown that they have a very significant impact on improvement the effectiveness of protection system. It can be stated that in typical medium voltage networks and solutions of active adaptive functions, good conditions are obtained for the operation of admittance protections even at several times higher resistances in the place of earth fault than when these functions are deactivated or not implemented.

Study on the Intelligent Current Protection for Mining Power System

2011 ◽  
Vol 317-319 ◽  
pp. 1368-1372
Author(s):  
Li Jun Zheng ◽  
Jian Cheng Song ◽  
Yun Guang Gao
Keyword(s):  
Mining Industry ◽  
Distribution Networks ◽  
Protection System ◽  
Underground Cable ◽  
Fault Type ◽  
Fault Protection ◽  
Fault Parameters ◽  
Control Centre ◽  
Phase Sensitive ◽  
Negative Sequence Current

The overcurrent fault characters in underground cable distribution networks is analyzed, the symmetry current fault protection based on phase-sensitive detection, the asymmetrical current fault protection based on negative sequence current detection and the overload current fault protection based on the amplitude current are designed. The protection system was tested and the result shows that signal can accurately reflect the type of fault and fault parameters. It has been realized intelligent current protection through automatic identify fault type by PLC and has been applied to mine flameproof and intrinsically safety load control centre. Practice shows that the mine's intelligent current protection system is realiable and will be of great applied value in mining industry.

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