Analysis of Switching Effects of Vacuum Circuit Breaker on Dry-Type Foil-Winding Transformers Validated by Experiments

Theocharis, Andreas; Popov, Marjan; Seibold, Robert; Voss, Stephan; Eiselt, Martin

doi:10.1109/tpwrd.2014.2327073

Cited by 42 publications

(12 citation statements)

References 43 publications

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“…shield between HV and LV windings results in the lowest SEb with value of 4.222×10 12 as seen in Table 7. Unshielded winding has lower SEb as compared to shield placement as conductor 7 and between conductors 1 and 2 as seen in Table 7.…”

Section: Plos Onementioning

confidence: 93%

“…Transformer winding equivalent circuits are traditionally used to examine the voltage surge distribution in the transformer windings [7][8][9]. Several studies have been carried out to examine the transient voltage surge propagations through simulations and experimental setups [10][11][12][13][14][15][16]. Lumped equivalent circuit model have been widely used to analyze the resonant responses of windings subjected to switching surges [6,[17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Effect of shield placement for transient voltage mitigation due to switching surges in a 33/11 kV transformer windings

et al. 2020

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This study presents an investigation on the effect of shield placement for mitigation of transient voltage in a 33/11 kV, 30 MVA transformer due to Standard Switching Impulse (SSI) and Oscillating Switching Impulse (OSI) surges. Generally, the winding and insulation in transformers could experience severe voltage stress due to the external impulses i.e. switching events. Hence, it is important to examine the voltage stress and identify the mitigation action i.e. shield placements in order to reduce the adverse effect to the transformer windings. First, the resistances, inductances, and capacitances (RLC) were calculated for disc type transformer in order to develop the winding RLC equivalent circuit. The SSI and OSI transient voltage waveforms were applied to the High Voltage (HV) winding whereby the transient voltages were simulated for each disc. The resulting voltage stresses were mitigated through different configurations of electrostatic shield placements. The resonant oscillations generated due to switching surges were analysed through initial voltage distribution. The analyses on the transient voltages of the transformer winding and standard error of the slope (SEb) reveal that the location of shield placement has a significant effect on the resonant switching voltages. The increment of the shield number in the windings does not guarantee optimize mitigation of the resonant switching transient voltages. It is found that the voltage stress along the windings is linear once a floating shield is placed between the HV and Low Voltage (LV) windings of the disc-type transformer under the SSI and OSI waveforms. These findings could assist the manufacturers with appropriate technical basis for mitigation of the transformer winding against the external transient switching overvoltage surges.

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Section: Plos Onementioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Effect of shield placement for transient voltage mitigation due to switching surges in a 33/11 kV transformer windings

et al. 2020

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“…For the capacitance of layer 2, i.e., layer 13 of HV winding was calculated for C ll and C ll,2 . Turn-to-turn capacitance of the layer 14 was also determined based on Equation (10). The capacitance for LV winding was obtained based on Equation 23:…”

Section: Calculation Of Capacitancementioning

confidence: 99%

“…Generally, a transformer's winding responses under impulses are mainly dependent on the design and system configuration. A number of studies have been carried out to examine the transient overvoltage surge propagations through simulations and experimental setups [8][9][10][11][12][13]. Under impulses, resonances in transformers could be initiated due to a frequency of the oscillating components that is similar to its frequency responses [14,15].…”

Section: Introductionmentioning

confidence: 99%

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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“…In [18], the possibilities of using VCBs instead of the power semiconductors are investigated on cost saving considerations. Theocharis et al [19] analyse the prestrike and the restrike effects during switching a VCB connected to a dry-type foil-winding transformer theoretically and experimentally. Wang et al [20] propose a multi-magnetic circuit PMA to satisfy the high-velocity requirements for 126 kV VCBs.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of a high‐speed permanent magnet characteristic actuator using eddy current effect for high‐voltage vacuum circuit breaker

Fang

Miao²,

Lin

et al. 2016

IET Electric Power Applications

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This study proposes a high-speed permanent magnet actuator (HSPMA) for high-voltage vacuum circuit breaker (VCB). The HSPMA comprises mainly of an eddy current repulsion force actuator and a permanent magnet (PM) actuator. The structural saliency of HSPMA is described and its control principle is elaborated in details. Finite element method is used and the eddy current is included in the computation of the electro-magnet fields of the HSPMA. The system equations, which couples the magnet field to circuit and mechanical equations, are built in ANSOFT Maxwell and Circuit Editor in this study of the making and breaking procedures of the HSPMA. The simulated characteristics show the design meets the requirement of the high-voltage VCB. The optimal thickness of the eddy current plate is 10 mm. The capacitor also has an economic optimal value of 10,000 µF. The simulated results indicate that the HSPMA has a sound characteristic when compared with circuit breakers with only PM actuator.

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Analysis of Switching Effects of Vacuum Circuit Breaker on Dry-Type Foil-Winding Transformers Validated by Experiments

Cited by 42 publications

References 43 publications

Effect of shield placement for transient voltage mitigation due to switching surges in a 33/11 kV transformer windings

Effect of shield placement for transient voltage mitigation due to switching surges in a 33/11 kV transformer windings

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

Analysis and design of a high‐speed permanent magnet characteristic actuator using eddy current effect for high‐voltage vacuum circuit breaker

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