A Study on the Ground Fault Current Distribution by Single Phase-to-Neutral Fault Tests in Power Distribution System

2013 ◽  
Vol 27 (7) ◽  
pp. 37-44
Author(s):  
Kyung-Chul Kim ◽  
Chang-Hun You
Keyword(s):  
Current Distribution ◽  
Power Distribution ◽  
Distribution System ◽  
Single Phase ◽  
Fault Current ◽  
Power Distribution System ◽  
Ground Fault ◽  
Fault Current Distribution

Recognition of the Single-Phase Ground Fault in Power Distribution System

2011 ◽  
Vol 480-481 ◽  
pp. 1581-1586
Author(s):  
Jun Zhang
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Single Phase ◽  
Transient State ◽  
Power Distribution Systems ◽  
Power Distribution System ◽  
Ground Fault ◽  
Analysis Computer ◽  
Novel Method

For power distribution systems, recognizing the single-phase ground fault is very difficult because there are several faults with similar features. This paper presents a novel method that can help to overcome this difficulty. The idea is to turns the original fault info into a whole system with transient state, steady state and transition state. Theoretical analysis, computer simulation and lab experiments verified the effectiveness of the proposed method.

The Study of Ferromagnetic Resonance Overvoltage and its Suppression Methods in 35kv Power System

2013 ◽  
Vol 748 ◽  
pp. 449-452
Author(s):  
Wei Jin ◽  
Kuang Shi ◽  
Jun Hao Li
Keyword(s):  
Power System ◽  
Simulation Model ◽  
Ferromagnetic Resonance ◽  
Power Distribution ◽  
Distribution System ◽  
Single Phase ◽  
Power Distribution System ◽  
Nonlinear Resistor ◽  
Ground Fault ◽  
Small Resistance

Ferromagnetic resonance overvoltage is an internal overvoltage and it often occurred in the power distribution system which neutral point ungrounded. A 35kV power system is used as the prototype to establish the 35 kV substation's simulation model which is based on the ATP - EMTP and ferromagnetic resonance overvoltage is researched and analyzed In this paper. The ferromagnetic resonance overvoltage which is stimulated by single-phase ground fault is studied in this paper studied and ferromagnetic resonance suppression methods were also studied. The results show that the nonlinear resistor is connected in the PT primary neutral side and small resistance is connected in the PT open delta are effectively methods which can restrain ferromagnetic resonance overvoltage.

scholarly journals A Single-Phase Buck-Boost Matrix Converter with Low Switching Stresses

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
Naveed Ashraf ◽  
Tahir Izhar ◽  
Ghulam Abbas
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Single Phase ◽  
Low Voltage ◽  
Sliding Mode ◽  
Low Frequency ◽  
Matrix Converter ◽  
Power Distribution System ◽  
Selective Approach ◽  
Switching Devices

The suggested single-phase ac-to-ac matrix converter operated with inverting and noninverting characteristics may solve the grid voltage swell and sag problem in power distribution system, respectively. It is also employed as a direct frequency changer for domestic induction heating. The output voltage is regulated through duty cycle control of high frequency direct PWM (DPWM) and indirect PWM (IDPWM) switching devices. The DPWM control switches control the switching states of IDPWM switching devices. The inverting and noninverting characteristics are achieved with low voltage stresses and hence low dv/dt across the high and low frequency-controlled switches. This reduces their voltage rating and losses. The high voltage overshoot problem in frequency step-up operation is also analyzed. The sliding mode (SM) controller is employed to solve this problem. Pulse selective approach determines the power quality of load voltage. The validity of the mathematically computed values is carried out by modelling the proposed topology in MATLAB/Simulink environment and through hardware results.

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