Symmetrical and Unsymmetrical Voltage Sag Effects on Three-Phase Transformers

Pedra, J.; Sainz, L.; Córcoles, F.; Guasch, Laura

doi:10.1109/tpwrd.2004.833910

Cited by 74 publications

(44 citation statements)

References 3 publications

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“…Since the load is purely resistive or purely inductive, only one discrepancy current component on the secondary side is presented. The discrepancy/errors (ɛ) are taken in accordance with 1 = X meas − X sim (16) where X meas is the measured value (current or voltage) and X sim is the simulated value. The nomenclature of the plots are as follows, u2 3 meaning the secondary voltage of the three-limb transformer.…”

Section: Comparisons Between Experiments and Modelsmentioning

confidence: 99%

Measurements and modelling of three‐ and five‐limb transformer behaviour during large voltage and frequency disturbances

Persson

Baig

Thiringer

2016

IET Generation, Transmission & Distribution

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This study presents the modelling of transformers for voltage disturbances. The focus in this study is on the security of the power supply for sensitive loads, for instance, the auxiliary systems for a nuclear power station feeding, for instance, pumps for emergency systems. Both steady-state operation as well as transient conditions have been analysed. A five-limb as well as a three-limb 4 kVA transformer was designed in order to verify theoretical assumptions with experimental results. The results show that the theoretical models provided results in conformity to the actual experiments with an average discrepancy of 3%. Moreover, it is shown that a five-limb transformer gives lower inrush currents, especially in the highly saturated region. In addition, it was demonstrated that an inductive load gives much higher inrush currents compared with a resistive load. A final observation was that the current drawn by the two transformers in their saturated state differ severely depending on the topology of the core.

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Section: Comparisons Between Experiments and Modelsmentioning

confidence: 99%

Measurements and modelling of three‐ and five‐limb transformer behaviour during large voltage and frequency disturbances

Persson

Baig

Thiringer

2016

IET Generation, Transmission & Distribution

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“…The behavior of the flux φ 2uv is affected by the voltage phase shift (v 2Suv ) caused by the fault and recovery. The simulation was carried out in the phase condition of maximum DC magnetic deviation [15], as will be explained below. As follows from Eq.…”

Section: Simulation Conditionsmentioning

confidence: 99%

“…In Ref. 15, the relationship between DC magnetic deviation and voltage depth (sag depth) in the presence of an SLG fault is mentioned but no quantitative formulation is proposed. The DC magnetizing current caused by magnetic deviation produces overcurrents in converter transformers, which results in magnetic saturation of the interconnection transformer.…”

Section: Introductionmentioning

confidence: 99%

Elucidation of DC magnetic deviation in converter transformers used for a self‐commutated BTB system during single‐line‐to‐ground faults

Hagiwara

Pham

Akagi

2009

Electrical Engineering Japan

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SUMMARYThis paper deals with a 50-MW self-commutated BTB (Back-To-Back) system intended for power flow control between transmission networks. It focuses on the dynamic behavior of the BTB system during single-line-toground (SLG) faults. During an SLG fault, a DC magnetic deviation appears in the converter transformers used for the BTB system just after the occurrence and restoration of the fault. It is indispensable to understand the magnitude of the deviation, because it may bring about magnetic saturation as well as subjecting the transformers to a large magnetizing current. This paper derives theoretical equations related to the deviation during the SLG fault. The theoretical analysis developed in this paper may make significant contributions to designing the transformers.

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“…Voltage sag can result in a mal-operation of the equipment [8]. Transformer saturation is caused precisely by the sudden voltage variation when voltage recovers, and it involves high inrush currents [5,9].…”

Section: Introductionmentioning

confidence: 99%

Simulation of effect of voltage sag on inrush current using MATLAB‐SIMULINK for educational purpose

Vahidi

Khorsandi

2012

Comp Applic In Engineering

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ABSTRACT:Transformer inrush currents are high-magnitude, harmonic-rich currents generated when transformer cores are driven into saturation during energization. These currents have undesirable effects, including potential damage to the transformer, reduced power quality on the system, and relay malfunction. In the present article the effect of voltage sag on inrush current are investigated. Due to aim of this article which is educational purpose the well-known software MATLAB-SIMULINK is used to simulate the effect of voltage sag on inrush current.

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Symmetrical and Unsymmetrical Voltage Sag Effects on Three-Phase Transformers

Cited by 74 publications

References 3 publications

Measurements and modelling of three‐ and five‐limb transformer behaviour during large voltage and frequency disturbances

Measurements and modelling of three‐ and five‐limb transformer behaviour during large voltage and frequency disturbances

Elucidation of DC magnetic deviation in converter transformers used for a self‐commutated BTB system during single‐line‐to‐ground faults

Simulation of effect of voltage sag on inrush current using MATLAB‐SIMULINK for educational purpose

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