Access to EMTP user presentations, webinars, and slide deck presentations.
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9 presentations for transmission lines:
Author(s): Umesh Sen - Power Grid
Type:Technical Presentation
Downloaded: 3
Date: 2021-06-21
POWERGRID experience with EMTP793
Abstract
To meet the increasing power demand, a number of extra high voltage (EHV) transmission lines is being added to the power system network, which enhances the complexity of power system network. It is es... see moresential duty of power engineer to fulfill the growing demand ensuring the reliability, stability & security of GRID. Transient simulation tools like EMTP play a vital role to provide the flexibility to power engineer for simulating/studying the various case scenarios which couldn’t be simulate in physical power system.
Such tools eventually help power engineer to build a sustainable and secure GRID. In POWERGRID, being a central transmission utility, various studies are being carried out to arrive the technical particular of new transmission system and optimize or fine tuning of existing system. Some of them i.e. Transient Recovery Voltage (TRV) study of 1200kV Transmission network, Smart Power from insulated earth wire of EHV transmission line and 1200kV Transformer Inrush current study are discussed in presentation. 1200kV National Test Station was established & successfully charged along with the transmission line in state of BINA in India.
TRV study was carried out for assessment of various test duties of 1200kV Circuit Breaker. Presentation cover the detailed discussion of 1200kV TRV study and a brief about the facilities like HIL, HVDC control Replica setup, STATCOM replica setup available at Powergrid Advanced Research and Technology Centre (PARTeC).
Simulation of switching Overvoltages and Field validations 754
Abstract
<p>This presentation is on the simulation of switching overvoltages on transmission lines with trapped charge, validation of EMTP line models, modeling of prestrike in statistical simula... see moretion studies and discussion of necessary simulation practices by means of validations with field tests.</p>
<p>Objectives: - Identify simulation practices to produce the field measurements en EMT simulation - Validation of line models - frequency dependence - Discussion on modeling approaches, simulation practices, sensitivity to electrical parameters - Evaluate maximum overvoltages - How to perform statistical simulations, model prestrike and include corona in statistical simulations efficiently.</p>
Author(s): Ilhan Kocar, Polytechnique Montréal
Type:Technical Presentation
Date: 2020-11-20
The validation of field measured switching overvoltages, inclusion of statistical prestrike and corona modeling750
Abstract
<h2 class="title">EMTP USA User Conference 2019 </h2> <p class="tagline"><b>The validation of field measured... see more switching overvoltages, inclusion of statistical prestrike and corona modeling</b></p> <p id="text-intro">This presentation is on the simulation of switching overvoltages on transmission lines with trapped charge, validation of EMTP line models, modeling of prestrike in statistical simulation studies and discussion of necessary simulation practices by means of validations with field tests. On transmission lines where switching surges are not mitigated with closing resistors and/or surge arresters, high-speed reclosing on a line with trapped charge will produce high overvoltages that have been measured above 3 pu. Careful simulations of these switching events using available Electromagnetic Transient (EMT) programs consistently produce significantly higher voltages than the measurements. It is demonstrated that the transient voltage waveforms can be reproduced very well using frequency-dependent line models, but the magnitude of the maximum overvoltage is significantly overestimated unless the effect of corona is considered. In principle, once a line model is validated, it is possible to proceed with statistical simulation phase to identify the worst-case overvoltage, which is of utmost importance for transmission line and substation related issues such as the evaluation of minimum approach distance and clearance practices. However, before proceeding with statistical simulation phase, it is also necessary to tune the prestrike model in EMTP. In this presentation, we also discuss how to benefit from field tests to fine tune the generic prestrike model in EMTP and then how to proceed with statistical simulation studies while taking corona into account in an efficient manner.</p>
Author(s): Antoine NAUD, RTE - Gaëtan GUTIERREZ, RTE - Wilfried FRELIN, EDF R&D - Minh NGUYEN TUAN, EDF R&D
Type:Technical Presentation
Date: 2020-11-20