Transformer Inrush and Rectifier Transient Currents

Specht, T. R.

doi:10.1109/tpas.1969.292424

Cited by 37 publications

(18 citation statements)

References 7 publications

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“…It is to be noted that 5 is the angle where the current becomes maximum, and it is not the same where flux has its maximum value [6].…”

Section: Analysis With Mutual Coupling Methodsmentioning

confidence: 99%

“…Numerous research were carried out since early 1940's [1][2][3][4][5][6][7] to derive their mathematical f ormulations and explain these phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…Theory of inrush current in single-phase transformers has been suitably covered by Specht [6]. One of the shortcomings of the earlier approach [6] was that, it was based on the assumption that the transformer is always energized at voltage-zero condition. Analytical treatment did not encompass a generalized expression of energizing the transformer at any arbitrary angle on the voltage waveform.…”

Section: Introductionmentioning

confidence: 99%

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Digital Simulation of Magnetizing Inrush Currents in Three-Prase Transformers

Rahman

Gangopadhyay²

1986

IEEE Trans. Power Delivery

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An accurate simulation of magnetizing inrush currents is an important prerequisite for digital protection of power transformers.Generalized analytical expressions have been developed to simulate three-phase inrush currents based on sequence impedance and mutual coupling methods. The digitally simulated waveforms are compared with those obtained experimentally in a laboratory model transformer.There exists a reasonably close agreement between the computed and measured values.

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“…It is to be noted that 5 is the angle where the current becomes maximum, and it is not the same where flux has its maximum value [6].…”

Section: Analysis With Mutual Coupling Methodsmentioning

confidence: 99%

“…Numerous research were carried out since early 1940's [1][2][3][4][5][6][7] to derive their mathematical f ormulations and explain these phenomena.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Digital Simulation of Magnetizing Inrush Currents in Three-Prase Transformers

Rahman

Gangopadhyay²

1986

IEEE Trans. Power Delivery

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“…Over the past many decades, a large number of simulation and experimental studies have been reported on the production and control of inrush currents in single and three-phase transformers [1][2][3][4][5][6][7][8]. Commonly used techniques to reduce inrush current are insertion of series resistor, point-on-wave switching etc.…”

Section: Introductionmentioning

confidence: 99%

Reduction of magnetizing inrush current in a delta connected transformer

Basu

Ali

2008

2008 IEEE 2nd International Power and Energy Conference

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Magnetizing inrush current in power transformer creates severe power quality problems. Energization of the transformer from the delta side of a delta-star transformer does not allow the control of neutral resistor at the time of switching the supply for reducing the inrush current. Controlled switching at peak value of the voltage may reduce inrush current in one winding of the transformer, but the line currents are not reduced. Delayed and controlled energization of the third phase may reduce inrush winding currents in two windings and only one line current is reduced, but the inrush currents in the other two lines become very high [11].The inrush current may be reduced either by inserting suitable value of resistance connected to each of the line wire or by combining the controlled switching at peak value of the voltage in one winding and resistance switching in the third phase. The resistances are shorted within a very short time after switching on the delta winding. Simulation studies of delta side energization of a delta-star transformer depict the results under various operating conditions. Optimum resistance value is decided to get a quick decay of inrush current, low voltage drop and losses before it is shorted.

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“…For over 50 years, considerable work has been carried out to investigate the electro-magnetic origin of the inrush current when energizing a large transformer in a power system [1]. The inrush current would disturb the normal operation of any electrical equipment, such as power electronic converters, adjacent to the transformer being energized.…”

Section: Introductionmentioning

confidence: 99%

A new technique to mitigate inrush current caused by transformer energization

Cipcigan

Dinavahi

IEEE Power Engineering Society Summer Meeting,

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This paper presents a new method to mitigate inrush currents caused by transformer energization. The method uses a grounding resistor connected at the transformer neutral and delayed energization of each phase of the transformer. The proposed method was tested by PSCAD/EMTDC simulation and laboratory experiments. Both simulation and experimental result show that the proposed scheme has a performance similar to that of the resistor pre-insertion scheme, but it will be much less expensive since there is only one resistor involved. The level of the inrush current reduction depends of the value of the neutral resistance and of the transformer parameters.

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Transformer Inrush and Rectifier Transient Currents

Cited by 37 publications

References 7 publications

Digital Simulation of Magnetizing Inrush Currents in Three-Prase Transformers

Digital Simulation of Magnetizing Inrush Currents in Three-Prase Transformers

Reduction of magnetizing inrush current in a delta connected transformer

A new technique to mitigate inrush current caused by transformer energization

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