Comparative study on sudden short-circuit currents of a synchronous generator

Chiver, Olivian; Neamt, Liviu; Matei, Oliviu

doi:10.1109/eeeic.2015.7165426

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…In case of dependence on the short-circuit current of generators with salient poles, different values of direct and quadrature parameters of the generator should be taken into account [22,23,25,26]:…”

Section: The Characteristic Of Low-power Silent Poles Synchronous Generatorsmentioning

confidence: 99%

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The Short-Circuit Protections in Hybrid Systems with Low-Power Synchronous Generators

et al. 2020

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Single-phase short-circuits are most often faults in electrical systems. The analysis of this damage type is taken for backup power supply systems, from small power synchronous generators. For these hybrid installations, there is a need for standard protection devices, such as fuses or miniature circuit breaker (MCB) analysis. Experimental research mentioned that a typical protective apparatus in low-voltage installations, working correctly during supplying from the grid, does not guarantee fast off-switching, while short-circuits occur during supplication from the backup generator set. The analysis of single-phase short-circuits is executed both for current waveform character (including sub-transient and transient states) and the carried energy, to show the problems with the fuses and MCB usage, to protect circuits in installations fed in a hybrid way (from the grid and synchronous generator set).

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Section: The Characteristic Of Low-power Silent Poles Synchronous Generatorsmentioning

confidence: 99%

“…where: One important problem associated with the operation of low-power synchronous generators is the relatively small values of the sub-transient and transient electromagnetic time constants of these generators, generally defined as [22,23,25,26]:…”

Section: The Characteristic Of Low-power Silent Poles Synchronous Generatorsmentioning

confidence: 99%

The Short-Circuit Protections in Hybrid Systems with Low-Power Synchronous Generators

et al. 2020

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“…The literature has widely described the phenomena connected with the generator short-circuits [8][9][10][11], but the authors have rarely examined these phenomena in the context of low-power hybrid systems, for example, diesel generators (DGs), where the characteristic low values of the time constants cause fast reaching of the steady-state short-circuit current (which is low as well). The analysis of the obtained results allowed the verification of individual applications of generators in electrical installations in the context of the selection or checking of the installed safety equipment.…”

Section: Introductionmentioning

confidence: 99%

The Analysis of the Symmetrical Short-Circuit Currents in Backup Power Supply Systems with Low-Power Synchronous Generators

Mamcarz¹,

Albrechtowicz²,

Radwan-Pragłowska³

et al. 2020

Energies

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This paper presents an analysis of the short-circuit currents of a synchronous generator with a rated power of 16 kVA. For this purpose, the authors carried out measurements of real short-circuit currents during laboratory tests. Additionally, a simulation model of the generator was developed according to the individual machines data from the catalog and field calculations in ANSYS Maxwell software. Based on the mentioned research, the authors compared waveforms of the symmetrical short-circuit currents. In this paper, the last compared family of short-circuit current waveforms was obtained using analytic calculations. As the presented comparison shows, the assumed method of selecting short-circuit waveforms impacted their values. However, the difference in energy related to short-circuit currents did not influence on the selection of the short-circuit protections, especially at low values of steady-state short-circuit currents and short time constants characteristic for the generators, performing the functions of an alternative power supply. Regardless of the research method, the results presented in the article show that the selection of the short-circuit protections is complicated in case of hybrid electrical systems equipped with low power generators.

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“…In [12], a hybrid model for detecting and diagnosing the turn-to-turn short-circuit fault of wound-rotor synchronous generator is proposed. In [13], the three-phase, two-phase and single-phase transient shortcircuits of the three-phase salient poles synchronous generator are calculated and analyzed by finite elements analysis and experiment. In [14] and [15], the model of stator faults of permanent magnet synchronous generator is established, and the auto stator fault diagnosis of permanent magnet synchronous generator is realized by ANN.…”

Section: Introductionmentioning

confidence: 99%

Calculation and Analysis of the Strands Short-Circuit in Stator Transposition Bar for Large Generators

Wang

Liang

et al. 2019

IEEE Access

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The transposition of the stator bar is an important technique in the large generator design. Under the excitation of vibration and thermal effect, the insulation of strand is easily damaged, which leads to short-circuiting fault, and adversely impacts the generator's secure operation. To better protect the generator, there is a need for detailed research of the characteristics of stator transposition bar under the strands short-circuit condition. In this paper, we proposed a 3D finite numerical method (FEM) for calculating the strand short-circuit current. In the proposed method, the whole model of stator transposition bar is divided into multiple piecewise segments, and each segment is coupled together by the circuit. Based on this method, the electromagnetic properties of the 308 • stator transposition bar under the strands short-circuit fault condition are analyzed. Then, the properties of the strand short-circuit current is studied. Finally, the calculated results are compared with the measured data. The results show that the calculation of the strand short-circuit current with high precision and the strand short-circuit current jump is one of the characteristics of strands short-circuit fault in stator transposition bar.

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Comparative study on sudden short-circuit currents of a synchronous generator

Cited by 8 publications

References 6 publications

The Short-Circuit Protections in Hybrid Systems with Low-Power Synchronous Generators

The Short-Circuit Protections in Hybrid Systems with Low-Power Synchronous Generators

The Analysis of the Symmetrical Short-Circuit Currents in Backup Power Supply Systems with Low-Power Synchronous Generators

Calculation and Analysis of the Strands Short-Circuit in Stator Transposition Bar for Large Generators

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