Chopping of Transformer Magnetizing Currents Part II: Three-Phase Transformers

Ihara, Satoshi; Panek, J.; Tuohy, E. J.

doi:10.1109/tpas.1983.318051

Cited by 9 publications

(2 citation statements)

References 5 publications

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“…This subject has also received very much attention in the literature; see for example [58], [60] and [61]. In this section we analyze the effects that hysteresis has in the disconnection of a transformer.…”

Section: Magnetizing Current Choppingmentioning

confidence: 99%

A simple representation of dynamic hysteresis losses in power transformers

León

Semlyen

1995

IEEE Trans. Power Delivery

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The paper describes a procedure for the representation of hysteresis in the laminations of power transformers in the simulation of electromagnetic transient phenomena. The model is based on the recognition that in today's iron cores the hysteresis loops are narrow and therefore the modeling details are only important in relation to the incurred losses and the associated attenuation effects. The resultant model produces losses proportional to the square of the flux density, as expected from measurement data. It is formulated as a simple, linear relationship between the variation B -Brev of the magnetic flux density B after a reversal point B,, and the resulting additional field intensity H , . This idea can be easily implemented in existing transformer models with or without frequency dependent modeling of eddy currents in the laminations. It has been found that in many simulation tests the representation of hysteresis is not necessary and those situations have been described where the modeling of hysteresis appears to be more meaningful.

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Section: Magnetizing Current Choppingmentioning

confidence: 99%

A simple representation of dynamic hysteresis losses in power transformers

León

Semlyen

1995

IEEE Trans. Power Delivery

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“…At high frequencies, for fast flux variations, the saturation and hysteresis of the transformer core can be neglected. The second case requires only the saturation and hysteresis [23], [24]. In order to calculate the electromagnetic transients accurately, one should consider the residual flux, because of its influence on the generation of overvoltage.…”

Section: Transformer Modelingmentioning

confidence: 99%

Improved calculations for no-load transformer switching surges

Popov

Sluis

2001

IEEE Trans. Power Delivery

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Abstract-This paper deals with a modeling of components and calculation of transient overvoltages that build up on the transformer primary terminals after the transformer has been switched off by a vacuum circuit breaker (VCB). The transformer is connected to the circuit breaker by a cable. The transient overvoltages are calculated for different cable lengths, and the cumulative probability of different arc angles is investigated.In this study two cases are considered: transient overvoltages due to steady-state magnetizing current switching, and transient overvoltages due to inrush current switching. It is shown that the case of inrush current switching is worse, as virtual current chopping is possible. The cable is modeled by pi sections, whereas the transformer model is based on a terminal impedance. The VCB re-ignitions are modeled by means of withstand voltage characteristics and high-frequency quenching capability. Due to shortage of field tests, this work uses only literature references to compare the results with actual measurements.

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Technical and economical analysis of 3‐LIMB and 4‐LIMB three phase transformers in Y_N/Y_N network

Elleuch¹,

Poloujadoff²

2002

Int Trans Elec Energy Syst

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This paper deals with the behaviour of the three phase three limb transformer (with or without tertiary winding) as well as the four limb tran@ormer under unbalanced steady states in a Y,/yn network. Technical and economical comparative analysis has been established among the different configurations of the transformers. The opportunity of the replacement of the four limb transformer, currently used in the Tunisian distribution network, by a three limb transformer equipped by a tertiary winding has been discussed. During the analysis, the example of a 20 KVA transformer with a tertiary winding and a fourth limb (which could be removed) has been tested. A satisfactory concurrent is obtained between theoretical and experimental results.

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Chopping of Transformer Magnetizing Currents Part II: Three-Phase Transformers

Cited by 9 publications

References 5 publications

A simple representation of dynamic hysteresis losses in power transformers

A simple representation of dynamic hysteresis losses in power transformers

Improved calculations for no-load transformer switching surges

Technical and economical analysis of 3‐LIMB and 4‐LIMB three phase transformers in Y_N/Y_N network

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Chopping of Transformer Magnetizing Currents Part II: Three-Phase Transformers

Cited by 9 publications

References 5 publications

A simple representation of dynamic hysteresis losses in power transformers

A simple representation of dynamic hysteresis losses in power transformers

Improved calculations for no-load transformer switching surges

Technical and economical analysis of 3‐LIMB and 4‐LIMB three phase transformers in YN/YN network

Contact Info

Product

Resources

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Technical and economical analysis of 3‐LIMB and 4‐LIMB three phase transformers in Y_N/Y_N network