Analysis and Design of an Electronic On-Load Tap Changer Distribution Transformer for Automatic Voltage Regulation

Quevedo, Josemar de Oliveira; Cazakevicius, Fabricio Emmanuel; Beltrame, Rafael; Marchesan, Tiago Bandeira; Michels, Leandro; Rech, Cassiano; Schuch, Luciano

doi:10.1109/tie.2016.2592463

Cited by 50 publications

(25 citation statements)

References 32 publications

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“…The calculated voltage continues to decrease almost linearly for the other layers. This phenomenon of sudden voltage drop along the layers would exert voltage stresses on the insulation of winding layers [38][39][40][41]. The slight difference between the simulated and calculated voltage distributions along the layers might be due to several assumptions made during the simulation.…”

Section: Comparison Between Simulated and Calculated Voltage Distribumentioning

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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Section: Comparison Between Simulated and Calculated Voltage Distribumentioning

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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“…For designing solid state OLTC and electronic switches respectively the most important is to design it for a steady state voltage across the each switch during the normal operation. Considering that taps on a regulation side are magnetically coupled with each other, commutation of the switches will effect in a changed voltage across the each switch [10]. Steady state voltage across the opened switch Sp, when Sq is turned-on can be calculated by equation (1) if the following conditions are fulfilled: a) main windings have the same turns ratio, b) tap windings have the same turns ratio, c) voltage dip across taps is neglected.…”

Section: Steady State Stresses On Solid-state Switchesmentioning

confidence: 99%

Analysis of Affected Phenomena on Electronic Oltc Design for Distribution Transformers

Opačak¹

2017

JEEIT

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“…All TC can be divided into two main groups: mechanically operated [20][21][22][23][24][25][26] and based on pure electronic devices [27][28][29][30][31][32][33]. Mechanically operated TC, which are the most applicable today for control in feeder transformers, have a relatively slow time response extending to 5-10 s. As a result, during fast load variations TC cannot keep always voltage deviations inside the permissible level (±10%) of a nominal value.…”

Section: Introductionmentioning

confidence: 99%

Selecting Ultracapacitors for Smoothing Voltage Deviations in Local Grids Fed by Transformer with Tap-Changer and Distributed PV Facilities

2019

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Widespread use of photovoltaic (PV) small and middle-power plants close or inside existing townships and villages may cause significant deviations of the grid voltage. Owing to the oscillation of solar irradiation and corresponding power flows these voltage instabilities can damage equipment and must be prevented. Designated for the voltage regulation tap-changers in distribution transformers located in a significant distance of such settlements have a sluggish response time. As a possible answer for their delay is the smoothing energy of flows in PV power installation by intermittent capacitor low-pass filtering (LPF) located near those PV facilities. The application of ultracapacitors (UC) for LPF is remarkable due to their sustainability and relatively low costs of energy storage. The parameters selection of such appliances is a well-designed procedure for linear circuits. However, DC–AC inverters in PV facilities are represented by a power (instead of a voltage) source. As a result, the total circuit including such LPF becomes a non-linear and its transient process and consequently, its efficiency is difficult to assess requiring each time of development the UC storage an application complex numerical procedure. Engineers are usual to work with linear circuits that are describing fine by a time constant is designated as a multiplication of a capacitance times load equivalent resistance. In the case of PV DC–AC inverters, such an approach can be applied as well but a value of a time constant should be corrected. Considering a significant cost of UC storage, the non-optimal selection of a correcting coefficient may cause considerable loses. Submitted in the presented article is an original approximation procedure giving an efficiently approachable technique to select correcting coefficient for describing non-linear dynamic process by its linear analog. This way the development low-pass UC filtering in electrical systems with PV plants becomes more efficient and simpler task.

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Analysis and Design of an Electronic On-Load Tap Changer Distribution Transformer for Automatic Voltage Regulation

Cited by 50 publications

References 32 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

Analysis of Affected Phenomena on Electronic Oltc Design for Distribution Transformers

Selecting Ultracapacitors for Smoothing Voltage Deviations in Local Grids Fed by Transformer with Tap-Changer and Distributed PV Facilities

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