Self Cause Identification of Ground-fault Accident in Customer Premises Low-voltage Distribution Line by Current Waveform

2016 ◽  
Vol 136 (8) ◽  
pp. 567-573 ◽  
Author(s):  
Kazunori Nishimura ◽  
Yusaku Marui ◽  
Wataru Sunayama
Keyword(s):  
Low Voltage ◽  
Current Waveform ◽  
Voltage Distribution ◽  
Ground Fault ◽  
Distribution Line

Improved Equivalent Resistance Method for Low-Voltage Distribution Line Loss Calculation

2014 ◽  
Vol 1008-1009 ◽  
pp. 417-420 ◽  
Author(s):  
Xiao Hui Liu ◽  
Lin Ma ◽  
Yun Song Shi ◽  
Yu Jiang Wang ◽  
Jun Hua Li
Keyword(s):  
Low Voltage ◽  
Equivalent Resistance ◽  
Voltage Distribution ◽  
Phase Current ◽  
Resistance Method ◽  
Loss Calculation ◽  
Three Phase ◽  
Distribution Line ◽  
Line Loss

Aiming at the insufficiency of Equivalent Resistance Method for a low-voltage distribution line loss calculation, this article has been improved. Then this paper presents the method of using three-phase quantity of electricity to calculate three-phase current, it can calculate the three-phase unbalanced line loss without current date and facilitate the application of Three-phase Unbalanced Method. It develops our own program based on Visio to calculate low-voltage distribution line loss. The results showed: Improved Equivalent Resistance Method improves the accuracy; in the three-phase unbalanced the method of using three-phase quantity of electricity to calculate three-phase current is more easily modified and more practical value.

scholarly journals Design of a Microgrid with Low-Voltage Ride-Through Capability and Simulation Experiment

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Wenchao Fan ◽  
Zaijun Wu ◽  
Xiaobo Dou ◽  
Minqiang Hu ◽  
Jieru Wei ◽  
...  
Keyword(s):  
Low Voltage ◽  
Distribution Network ◽  
Fault Recovery ◽  
Voltage Distribution ◽  
Distribution Grid ◽  
Distributed Generations ◽  
Low Voltage Ride Through ◽  
Ground Fault ◽  
Islanded Mode ◽  
Network Fault

A microgrid with low-voltage ride-through capability is designed. The designed microgrid avoids operating in unplanned islanded mode during an asymmetric ground fault which occurs in the low voltage distribution network and supports fault recovery for distribution network. Furthermore, compared with the traditional microgrid topology, the proposed microgrid topology also saves a lot of power electronic devices. The simulation results with PSCAD/EMTDC show that the microgrid can keep the distributed generations and loads operate normally when an asymmetric ground fault occurs in the low voltage distribution grid. It can also increase the active power output according to the requirement of the distribution network to support the distribution network fault recovery.

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