Effect of shielding on surge overvoltages in multilayer type windings of power transformer

Adamczyk, B.; Florkowski, Marek; Świątkowski, Michał

doi:10.1109/tdei.2016.005691

Cited by 5 publications

(8 citation statements)

References 9 publications

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“…The oscillatory nature of the overvoltage surges in the windings due to the external SLI and CLI impulses are caused by the presence of passive RLCM elements in the transformer winding circuit [3]. The placement of shield conductor in the winding geometry would divert the generated voltage stresses on the surface of the shield as a result from to the increment of series capacitance [18]. This phenomenon would calibrate α as close to 0 and lead to linear initial voltage distribution.…”

Section: Discussion On the Effect Of Shield Placements On The Initialmentioning

confidence: 99%

“…The resonant overvoltages could exert electrical stresses on the insulation of the transformer windings. The resonant overvoltages can be characterized by the factor, α as given in Equation 1 [3,18,19]:…”

Section: Resonant Overvoltage In Transformer Windingmentioning

confidence: 99%

“…The effect of electrostatic shields on the voltage distributions of windings has been studied in [16][17][18][19][20]. A study in [21] reveals that the placement of a grounded shield between high voltage (HV) and low voltage (LV) windings has no impact on reducing the internal resonance frequencies of the voltage gradients.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Resonant Oscillations in an 11 kV Distribution Transformer under Standard and Chopped Lightning Impulse Overvoltages with Different Shield Placement Configurations

et al. 2019

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This paper presents an investigation on the resonant oscillations of an 11 kV layer-type winding transformer under standard and chopped lightning impulse overvoltage conditions based on calculated parameters. The resistances, inductances and capacitances were calculated in order to develop the transformer winding equivalent circuit. The impulse overvoltages were applied to the high voltage (HV) winding and the resonant oscillations were simulated for each of the layers based on different electrostatic shield placement configurations. It is found that the placement of grounded shields between layer 13 and layer 14 results in the highest resonant oscillation and non-linear initial voltage distribution. The oscillation and linear stress distributions are at the lowest for shield placement between the HV and low voltage (LV) windings.

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Section: Discussion On the Effect Of Shield Placements On The Initialmentioning

confidence: 99%

Section: Resonant Overvoltage In Transformer Windingmentioning

confidence: 99%

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Investigation on the Resonant Oscillations in an 11 kV Distribution Transformer under Standard and Chopped Lightning Impulse Overvoltages with Different Shield Placement Configurations

et al. 2019

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“…Since the conductors are located at considerable distance from transformer core, the effect of the core on the resistance is considered as negligible. The capacitance between 2 adjacent turns, Ctt was calculated based on (8) and (9).…”

Section: B Calculation Of Rlc Parameters For Transformer Modelingmentioning

confidence: 99%

“…Transformers could fail in-service due to sudden voltage surges even though it has passed the impulse test carried out during type test at manufacturing stage [4,5]. The distribution of transient voltage along a transformer winding is normally characterized by the factor α, as given in (1) [6][7][8],…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Transient Voltage in a 11 kV Transformer Under Lightning Surges

Murthy

Azis

Yousof

et al. 2018

2018 IEEE 5th International Conference on Smart Instrumentation, Measurement and Application (ICSIMA)

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This paper investigates the transient voltage distribution in a 11 kV layer type winding transformer under a standard 1.2/50 µs lightning impulse. The winding parameters known as resistance (R), inductance (L) and capacitance (C) were obtained through numerical calculation which were used to simulate the lumped equivalent circuit model. The calculated and simulated voltage distributions in all the layers of HV winding were analyzed. There is a steep and linear distribution of simulated and calculated voltage.

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Simulation of Fast-Rise Transients in a Large-Power Transformer Winding

Tarditi

et al. 2020

IEEE Trans. Electromagn. Compat.

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Effect of shielding on surge overvoltages in multilayer type windings of power transformer

Cited by 5 publications

References 9 publications

Investigation on the Resonant Oscillations in an 11 kV Distribution Transformer under Standard and Chopped Lightning Impulse Overvoltages with Different Shield Placement Configurations

Investigation on the Resonant Oscillations in an 11 kV Distribution Transformer under Standard and Chopped Lightning Impulse Overvoltages with Different Shield Placement Configurations

Investigation on the Transient Voltage in a 11 kV Transformer Under Lightning Surges

Simulation of Fast-Rise Transients in a Large-Power Transformer Winding

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