Experimental Study of HBC Fuses with Aluminium Fuse Element at Minimum Rated Breaking Current

Sălceanu, Cristian-Eugeniu; Nicola, Marcel; Ocoleanu, Daniel; Iovan, Daniela; Enache, Sorin

doi:10.1109/icate49685.2021.9465000

Cited by 6 publications

(3 citation statements)

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“…The wire material used was high purity copper (99.9%) with larger geometric characteristics (1.0 mm in diameter, with a length ranging from 150 to 180 mm). These experimental results showed the change in resistance and plasma formation and expansion of the current and voltage waveforms of the used pulses by X-ray imaging, photographic study and measurement [27][28][29][30][31][32]. Detail of the development of plasma spots was studied using photographic images.…”

Section: Literature Reviewmentioning

confidence: 99%

“…According to the procedure of experimental identification in the closed-loop of the astatic system with inertia second order and analytical expressions for calculation the tuning parameters, the algorithm for data-driven control of the astatic systems with inertia is following: 5. Tuning the PD controller by the expressions ( 9)-( 10), or PID controller by the expression ( 18)- (20), or ( 25)- (27).…”

Section: F Algorithm For Data Driven Controlmentioning

confidence: 99%

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Untitled

2023

AUCEE

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Characterized by very good performance in both steady-state and dynamic regimes and also by a relatively simple control structure, the induction motor control with rotor flux orientation is frequently adopted in electric drive systems, especially in electric traction applications. This paper analyses the possibilities of rotor flux estimation in a real Romanian electric traction system of locomotives. Thus, to estimate the magnitude of rotor flux and the angular position of the rotor flux vector, two possibilities are identified and discussed. First, the use of the sensed speed and stator currents is taken into consideration, and then the use of the measured supply voltages and the stator currents is the second alternative. Dedicated algorithms were designed for their related control. Both variants are analyzed through the results of the simulations obtained based on the specific models created in the Matlab/Simulink software. Four values of the imposed speed are taken into account in the performed analysis. It is highlighted that, in real conditions where the drive system is provided with speed sensor and there is no sine filter for the distorted motor supply voltage, the best option to estimate the rotor flux is to use the measured speed and the stator currents.Cuvinte cheie: motor asincon, control cu orientare după fluxul rotoric, estimarea fluxului rotoric, tracțiunea electrică a locomotivelor, controlul vitezei.

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Section: Literature Reviewmentioning

confidence: 99%

Section: F Algorithm For Data Driven Controlmentioning

confidence: 99%

Untitled

2023

AUCEE

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“…The no-load losses of the transformer reflect the condition of the iron core and windings. They are typically measured using offline no-load tests, which are difficult to implement in the field [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Dynamic Short-Circuit Withstand Capability of an 8400 kVA Power Transformer Specially Designed for Photovoltaic Applications

Sălceanu,

Dobrea,

Ocoleanu

et al. 2023

Machines

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This article, besides offering data of great value for any designer of high-power short-circuits of special three-winding design, illustrates the correlation with the corresponding FRA measurements, validating this type of measurement. The frequency response measurements can provide data about the transformer’s status after it is put into service, its vulnerability in incipient states, and, particularly for this type of transformer, its insulation, which is the subject of high dielectric stress due to its invertor working regime. This article presents the behavior of a three-phase 8400 kVA medium-voltage step-up transformer (corrugated hermetic tank) specially designed for photovoltaic applications during short-circuit tests. This transformer, fed by two inverters, has two secondaries with elliptical windings (non-circular aluminum foil for LV windings and an aluminum conductor for HV windings). Various experiments were performed, including measurements of winding resistance, measurements of voltage ratio, measurements of short-circuit impedance and load loss on three tappings, measurements of no-load loss and current, a frequency response analysis, and short-circuiting. These experiments were performed to study the behavior of the transformer, which, in real life, is powered by photovoltaic inverters on the LV side that feed into the MV grid on the HV side, making it the interface between the photovoltaic inverter and the MV grid. An auxiliary supply transformer may be connected to the LV side. Given these elements, concerning both the importance and the particularities of the problem studied, we can say that this article represents a niche study on the guarantee of good functioning and safety in operation given the passing of the test to withstand the dynamic effects of short-circuiting.

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