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2 presentations for bctran:

Author(s): Bozidar Filipovic,Nina Stipetic, Franjo Vukovic
Type:Technical Presentation
Downloaded: 0
Date: 2023-04-01
Lightning Overvoltages Transferred Through Power Transformers - EMTP® Simulations & Measurements880
Abstract
In this presentation, different wideband transformer models will be presented: extended BCTRAN model and black-box model based on measurements of frequency-dependent admittance matrix. These models ar... see moree validated using transferred overvoltages measured in high voltage laboratory. Afterwards, the results of the EMTP simulations of the lightning overvoltages are presented and compared to the onsite measurements at power transformer terminals.
Tag(s): Step-Up Transformer, Short-Circuit, Protection Schemes, Real-Time Implementation, Sensitivity Analysis

Impact of Power Transformer Energization on Relay Protection Operation844
Abstract
One of the main causes of the incorrect operation of transformer relay protection are inrush currents. The transient inrush current occurs when energizing the unloaded transformer, and it is a consequ... see moreence of the transformer core saturation. This paper presents analysis of transients caused by energization of 300 MVA three-phase autotransformer with stabilizing winding and voltage ratios 400/115/10,47 kV.
Using the PAMSUITE Toolbox in EMTP, many simulations were performed to show the impact of model’s parameters on the amplitude and duration of inrush currents as well as the probability of 2nd harmonic differential current amplitude occurrence. Simulation results show that controlled switching reduces inrush currents amplitudes and increases 2nd harmonic content in differential currents. A Protection Toolbox in EMTP was used for modelling CT saturation and operation of transformer’s differential protection relay.
Based on the simulation results the optimal differential protection settings were determined, and the probability of false relay protection operation was calculated.
Tag(s): transformer, energization, inrush, differential, protection, harmonics, bctran, pamsuite