Technical Presentations

Analysis of transient recovery voltage on circuit-breaker connected to HV terminals of step-up transformer located in hydro power plant 871

Abstract
This presentation deals with TRV on circuit-breaker installed in GIS at HV terminals of step-up transformer located in hydro power plant. An overview of standards covering TRV will be given. Modelling... see more of power system components in EMTP® for TRV studies will be shown (generator, power transformer, electric arc model inside circuit breaker, etc.). Results of EMTP® simulations will be presented covering different cases of TRV (for out-of-phase conditions, single-phase to ground and three-phase faults, short-line faults, switching off small capacitive currents, etc.).

Tag(s): Transient Recovery Voltage (TRV), Step-Up Transformer, Generator Synchronization, Out-of-Phase Switching, Short-Circuit

Secondary arc in hybrid AC DC overhead lines872

Abstract
This presentation covers a specific issue related to hybrid AC / DC overhead transmission lines: the extinction of the secondary arc current of a faulted DC pole. As a result of a pole-to-ground fault... see more, breaker openings interrupt the short-circuit current. Because of the inductive and capacitive coupling between the AC circuit and the faulted pole, a small AC current (a few 10ths Amps) keeps flowing in the fault. This current is known as the secondary arc current and it may disappear after some time.

Tag(s): AC/DC Lines, Secondary Arc, Sensitivity Analysis, Frequency Scan, Shunt Reactors, High-Speed Earthing Switches

EMTP in Transmission Planning Research859

Abstract
The initiation of inverter-based generation (IBG) has been changing the characteristics of the grid. The addition of non-traditional generation sources gives rise to several grid concerns, such as red... see moreuced short-circuit fault current capacity and harmonic concerns. Because of this, the use of EMT studies has been becoming more common to accommodate special studies. This presentation will highlight a few examples of the use of EMTP in transmission level planning research.

Tag(s): inverter-based generation, short-circuit fault, harmonic analysis, transmission planning

Use of EMTP in Transmission Planning Research772

Abstract
The initiation of inverter-based generation (IBG), has been changing the characteristics of the grid. The addition of non-traditional generation sources gives rise to several grid concerns, such as re... see moreduced short-circuit fault current capacity and system inertia as well as ineffective voltage regulation. Because of this – the use of EMT studies has been becoming more common to accommodate “special” studies. This presentation will just highlight a few examples of the use of EMTP in transmission level planning.