A novel method to reduce the harmonic currents in the residual earth fault current during a single phase to ground fault in compensated grids

2019 ◽  
Author(s):  
Michael Steglich ◽  
Christopher Lowe ◽  
Bjorn Bauernschmitt ◽  
Christian Rehtanz ◽  
Ralf Bohm ◽  
...  
Keyword(s):  
Single Phase ◽  
Fault Current ◽  
Earth Fault ◽  
Ground Fault ◽  
Harmonic Currents ◽  
Novel Method

scholarly journals Design of Automatic Detection Model for Single-phase Earth Fault in Distribution Network

1970 ◽  
Vol 1 (1) ◽  
Author(s):  
Yang Fan
Keyword(s):  
Fault Detection ◽  
Single Phase ◽  
Distribution Network ◽  
Automatic Detection ◽  
Input Vector ◽  
Detection Accuracy ◽  
Detection Model ◽  
Earth Fault ◽  
Ground Fault ◽  
Ground Fault Detection

The current distribution network single-phase ground fault detection model knowledge expression is poor, its production process only based on the normal distribution network sample data, no single-phase ground fault data, did not make full use of a prior knowledge, resulting in low detection accuracy. The automatic detection model of single-phase earth fault of new distribution network is proposed. The fault characteristic vector is taken as the input vector, and the degree of matching between the input vector and the weight vector element is introduced as the second layer. The fault vector is used as the input vector, and the fault vector is used as the input vector. Node input, the second layer of the output as the third layer of the input, the model training, the output of the results of the distribution network is a single-phase ground fault detection results. The experimental results show that the proposed model has high detection accuracy. 

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.

scholarly journals Analysis of the Influence of the Insulation Parameters of Medium Voltage Electrical Networks and of the Petersen Coil on the Single-Phase-to-Ground Fault Current

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1330
Author(s):  
Dumitru Toader ◽  
Marian Greconici ◽  
Daniela Vesa ◽  
Maria Vintan ◽  
Claudiu Solea
Keyword(s):  
Fault Location ◽  
Single Phase ◽  
Analytical Calculation ◽  
Electrical Network ◽  
Fault Current ◽  
Electrical Networks ◽  
Medium Voltage ◽  
Ground Fault ◽  
Fault Currents ◽  
Petersen Coil

Settings of protection are essential to ensure the sensitivity and selectivity needed to detect defects. Making the correct settings requires the calculation of the fault currents with as little error as possible. Fault currents are influenced by the parameters of the electrical networks, including the state of the insulation and the Petersen coil, which changes during their operation electrical networks. This paper analyzes how the insulation parameters of medium voltage power lines, the parameters of the Petersen coil used to treat the neutral of the medium voltage electrical network and the value of the resistance at the fault location influence the fault current in the case of a single-phase fault. The large number of single-phase faults that occur in medium voltage electrical networks justifies this analysis. The symmetrical components method was used to calculate the fault current. The results obtained by calculation were verified experimentally by causing a single-phase-to-ground fault in a real medium voltage network. The paper presents the situations in which the analytical calculation of the single-phase-to-ground fault current can lead to inadmissibly large errors, even over 50%, but also the situations in which the errors fall below 3%.

scholarly journals Diagnosis and Protection of Alternators Against Mass Faults

2020 ◽  
Vol 89 (1-4) ◽  
pp. 14-20
Author(s):  
Kouidri Mohammed Ali ◽  
Nouar Allal ◽  
Djilali Mahi
Keyword(s):  
Common Type ◽  
Fault Current ◽  
Circuit Breakers ◽  
Industrial Systems ◽  
Generator Protection ◽  
Earth Fault ◽  
High Impedance ◽  
Ground Fault ◽  
Fault Currents ◽  
Protection Systems

Generator protection system is one of the complicated industrial systems incorporating many group elements; measurement transformer, relays, circuit breakers and wiring connectors. Generally, protection systems are described using four characteristics; dependability, Sensitivity, rapidity and selectivity. The stator earth fault is a relatively common type of fault. The generators normally have grounded high impedance, that is to say, a ground via a neutral point resistor. This resistance is normally dimensioned to give a ground fault current of the order of 5 to 15 A in the event of permanent earth fault in high voltage terminals of the alternator. Relatively low ground fault currents cause. The new protection technique, it is called an intermittent defect, this type of defect usually has the following characteristics, A very short earth current pulse of high intensity (up to several hundred amps), lasting less than 1 ms. It occurs / disappears automatically over half a period, possibly over several periods, depending on the state of the power grid and the characteristics of the fault. Over longer periods (from several seconds to several minutes), it can evolve into a permanent fault.

scholarly journals Mathematical Modeling of Arc Faults in Networks with Low Single Phase-to-Ground Fault Currents

2019 ◽  
Vol 140 ◽  
pp. 05001
Author(s):  
Andrei Brilinskii ◽  
Georgiy Evdokunin ◽  
Anna Petrova ◽  
Irina Ryndina
Keyword(s):  
High Frequency ◽  
Gas Flow ◽  
Single Phase ◽  
Channel Model ◽  
Distribution Networks ◽  
Electric Arc ◽  
Fault Current ◽  
Zero Crossing ◽  
Ground Fault ◽  
Frequency Current

The article comprises the results of the research defining open-flame arcs self-quenching conditions in the event of a single phase-to-ground fault in overhead medium-voltage distribution networks according to existing theories of arc extinguishing. The calculations included metallic and arc faults modeling in a network with low phase-to-ground fault current. The arc gap simulation based on the mathematical channel model of a cylindrically symmetrical upright arc stabilized by rising convective gas flow was carried out in ATPDraw software program. The single phase-to-ground arc fault calculations results indicated an increase in high-frequency currents’ attenuation rate during transient processes as well as a reduce reduction in the electric arc lifetime from 8 ms to 2 ms in case of the breakdown voltage decrease from the peak value to zero. Notably, in case of low single phase-to-ground fault current the arc extinguishing took place at the first high-frequency current zero. For the cases of nonzero breakdown voltages, the electric arc extinguishing was detected at the fundamental frequency current component zero-crossing instant. The maximum overvoltage ratio of K = 2.8 was obtained as athe result of the single phase-to-ground fault at the peak phase voltage.

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