Point on Voltage Wave Switching for Sympathetic Inrush Current Reduction

Yahiou, Abdelghani; Bayadi, Abdelhafid; Babes, Badreddine

doi:10.1109/icass.2018.8651972

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…The laboratory tests conducted in order to quantify the peak value of the inrush current, to prevent some situations of failure require great expense and are not being performed. For this reason, analytical methods and the simulation of the phenomenon were used to determine the magnitude of the transient current generated when wiring the transformer, to avoid possible damage and to choose the adequate protections [18][19][20][21][22][23][24][25].…”

Section: The Inrush Current Generated On High-power Transformer Wiringmentioning

confidence: 99%

“…the thermal assessment is aimed at the faster-than-anticipated aging due to the excess temperatures caused by the hot spot of the winding, the hot spot in the core and the defects of paper-insulated hot metals; 2. dielectric evaluation follows the process of degradation of solid / liquid insulation due to high thermal or electrical voltage, moisture in the paper / dielectric liquid, manufacturing defects and contamination with conductive particles; 3. the mechanical assessment is aimed at the disintegration of the structure in the core, the windings and the solid insulation, due to one of the many reasons, such as the strong electromagnetic forces resulting from the flow of short-circuit current through the windings; the mechanical deformation of the windings due to the shocks during transportation, installation or during system failures, etc. ; and the degradation of solid insulating materials [16][17][18][19][20][21][22][23][24][25]. Some of the operations concerning the maintenance of power transformers can be established following the modeling of the transient phenomena, starting with the design stage.…”

Section: Introductionmentioning

confidence: 99%

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Transitory Regimes and Their Effects on the Insulation of High Power Transformers

Duță¹,

Nitu²,

Nicola³

2020

AJECE

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Transformers are the most important pieces of equipment in the electricity transmission and distribution system.Their importance derives both from their high cost and from the fact that they ensure a proper operation of the national power system. The transitory regimes generated during the operation of transformers, such as the overvoltage caused by the lightning impulse and the transient currents when wiring the transformers result in mechanical stress, thermal stress and electrical stress in transformers. These stresses lead to the aging of the insulation system, to avoid possible damage or even the decommissioning of transformers, this paper presents analytical methods for determining the overvoltage transmitted between the windings of transformers due to the lightning impulse and the transient currents that occur when connecting the transformers. The studies were performed on two high power transformers: TTOS-OFAF of 40 MVA, 123 6.3 kV was used to determine the overvoltages that propagate at the windings of the transformer subjected to lightning impulse, and on TTOS-OFAF of 15 MVA, 10.5 / 6.3 kV was performed the study on the effects of the appearance of the connection current on the transformer insulation. The studied phenomena can have a negative impact on the transformer operation.. The results obtained have been validated by laboratory tests, and they can be used to determine the measures to be taken in order to avoid possible damages as of the time of the transformer implementation in the system.

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Section: The Inrush Current Generated On High-power Transformer Wiringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transitory Regimes and Their Effects on the Insulation of High Power Transformers

Duță¹,

Nitu²,

Nicola³

2020

AJECE

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“…To measure the inrush current in a three-phase transformer, a laboratory experimental setup with an acquisition system (dSPACE card) is detailed and presented in this article. The technique presented and proposed by Yahiou et al [20,21] has exploited to reduce the three-phase transformer transient current. This technique is based on Faraday's law to estimate the magnetic flux waveform via the voltage waveform, then the value of residual flux at the de-energizing moment (the circuit breaker is open) is estimated.…”

Section: Introductionmentioning

confidence: 99%

Inrush Current Reduction by a Point-on-wave Energization Strategy and Sequential Phase Shifting in Three-Phase Transformer

Yahiou

Mellah

Bayadi

2022

IJE

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The main goal of this work is the mitigation of inrush current in a three-phase transformer. This inrush current appears when energizing a no-load or lightly loaded transformer. It can reach very high values and can cause failures in the electrical system. The control strategy is achieved by considering the value of the residual flux when the transformer is de-energized as well as by respecting the phase shifting between the three phases. To measure the inrush current, an experimental configuration with a data acquisition system using dSPACE 1104 card was developed and is presented in this paper. A technique to control the circuit breaker for energizing a 2 kVA three-phase transformer without the appearance of inrush current was also tested and applied in the experimental setup. The specific contribution of this work is that this technique is applied in the measurements with a thorough investigation of the residual flux. The proposed technique achieved complete elimination of the inrush current.

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