Numerical Simulations and Experimental Tests for the Analysis of Capacitive Load Switching in Power Circuits

Sălceanu, Cristian-Eugeniu; Nicola, Marcel; Nicola, Claudiu-Ionel; Ocoleanu, Daniel Constantin; Dobrea, Cătălin Răzvan; Iovan, Daniela; Enache, Sorin

doi:10.1109/epe56121.2022.9959792

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…In order to be equivalent to a direct test, the MTSC test technique must account for the restrike phenomena. When a restrike happens in a general direct test, the differential voltage between the poles becomes zero, and the injection current flows with the circuit's inherent frequency [3,4,15].…”

Section: Restrike Phenomenonmentioning

confidence: 99%

“…A phenomenon known as NSDD is when an electrical discharge happens but does not result in the current between the contacts starting up again. The polarity does not change and the Vt does not hold to zero in the case of NSDD [15]. Due to the fact that a restrike and NSDD have different impacts on the performance of the CB, it is crucial to make a distinction between the two.…”

Section: Nsdd Phenomenonmentioning

confidence: 99%

See 1 more Smart Citation

Improved Testing Method Using the Multi-Transformers Synthetic Circuit to Verify Capacitive Charging Current Switching Capability of High-Voltage Circuit Breakers

Kim

Choi

Patil³

et al. 2023

Energies

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To perform a capacitive current switching test (CCT) at AC extra-high-voltage (EHV) and above level, this paper proposes a new multi-transformer synthetic circuit (MTSC) test method that replaces the general synthetic test method using capacitor banks. An MTSC method has a simpler circuit structure compared to other synthetic testing methods and has higher equivalence (especially recovery voltage and TRV) and validity. Using this method, CCTs for circuit breakers (CBs) of the AC 420 kV voltage class were performed as a field test using the IEC 62271-100 standard. To verify that the test method was valid, test results were analyzed and compared with the requirements of a standard. Consequently, the MTSC method completely covered the requirements of the standard.

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Section: Restrike Phenomenonmentioning

confidence: 99%

Section: Nsdd Phenomenonmentioning

confidence: 99%

Improved Testing Method Using the Multi-Transformers Synthetic Circuit to Verify Capacitive Charging Current Switching Capability of High-Voltage Circuit Breakers

Kim

Choi

Patil³

et al. 2023

Energies

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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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Numerical Simulations and Experimental Tests for the Analysis of Capacitive Load Switching in Power Circuits

Cited by 2 publications

References 7 publications

Improved Testing Method Using the Multi-Transformers Synthetic Circuit to Verify Capacitive Charging Current Switching Capability of High-Voltage Circuit Breakers

Improved Testing Method Using the Multi-Transformers Synthetic Circuit to Verify Capacitive Charging Current Switching Capability of High-Voltage Circuit Breakers

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

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