A fault current calculation method in a neutral point ungrounded system for a single-phase ground fault

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%.

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Improved Fault Current Calculation Method for Pole-to-Pole Faults in MMC Multi-Terminal HVDC Grids Considering Control Dynamics

2018 IEEE Energy Conversion Congress and Exposition (ECCE) ◽

10.1109/ecce.2018.8557979 ◽

2018 ◽

Cited By ~ 3

Author(s):

Marius Langwasser ◽

Giovanni De Carne ◽

Marco Liserre ◽

Matthias Biskoping

Keyword(s):

Calculation Method ◽

Fault Current ◽

Current Calculation

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Development of the intelligent single phase-to-ground-fault current compensation system for 6–35 kV networks

2016 11th International Forum on Strategic Technology (IFOST) ◽

10.1109/ifost.2016.7884244 ◽

2016 ◽

Cited By ~ 2

Author(s):

A. A. Kuzmin

Keyword(s):

Single Phase ◽

Compensation System ◽

Fault Current ◽

Current Compensation ◽

Ground Fault

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Phasor and directions of a bolted single-phase-ground fault current in a high-resistance grounded (HRG) power system

2016 IEEE/IAS 52nd Industrial and Commercial Power Systems Technical Conference (I&CPS) ◽

10.1109/icps.2016.7490258 ◽

2016 ◽

Cited By ~ 2

Author(s):

Dev Paul

Keyword(s):

Power System ◽

High Resistance ◽

Single Phase ◽

Fault Current ◽

Ground Fault

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Automatic Tuning Arc Suppression Coil Current in a Small Grounding System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.620.398 ◽

2014 ◽

Vol 620 ◽

pp. 398-401 ◽

Cited By ~ 1

Author(s):

Hui Lin Zhang ◽

Yu Bo Zhao ◽

Feng Zhen Liu

Keyword(s):

Common Good ◽

Single Phase ◽

Short Circuit ◽

Neutral Point ◽

Automatic Tuning ◽

Normal Operation ◽

Ground Fault ◽

Arc Suppression Coil ◽

Current Flows ◽

Petersen Coil

Equipped Petersen coil systems can compensate for the capacitance of the line current, the single-phase ground fault current flows through the capacitor grounding point for the minimum point of the arc of a reliable ground fault arc , to avoid reigniting , prevent arcing ground fault point phase faults caused by short circuit . But will also prevent the neutral point displacement due to different switching operation of single-phase disconnection caused by other factors , to avoid the neutral point voltage is too high, the threat of insulation safety equipment . In addition Petersen coil in the normal operation of the power grid , and can effectively prevent resonance over-voltage , prevent equipment damage caused thereby , better protection of system security , stability, and high-quality operation. Automatic tuning arc suppression coil can meet the common good basis to eliminate the role of the Petersen coil grid resonance occurs , install and use the effect is significant.

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