R+D+ i activities, studies and projects

The LCOE carries out specific studies of transients of high-voltage electrical networks, especially in the field of high-voltage insulated cables with their connection to GIS and high-voltage overhead lines.

Studies of Transient Overvoltages / Measurements of Very Fast Transients

The burying of High Voltage cables and their connection to GIS have created numerous problems of overvoltages and insulation faults.

The LCOE carries out specific studies of transients of high-voltage electrical networks, especially in the field of high-voltage insulated cables with their connection to GIS and high-voltage overhead lines.

The studies are carried out using the ATP program and its own calculation tools, developed for the determination of overvoltages in screens of high voltage cables that are connected in different configurations (cross-bonding, single-point with or without equipotential conductor).

The tools make it possible to configure any type of connection architecture between the screens of high voltage cables, even when they are connected to overhead lines and GIS in order to be able to evaluate the most unfavorable conditions against different types of fault (substation fault, fault distant pass-through and siphon effect).

The tool has been used by designers of new isolated lines and existing lines. Situations such as the transition from an overhead line to underground to cross a highway or substation exits through insulated cable are commonly simulated case studies in order to choose the best solution.

Studies in ATP and field measurements have made it possible to model and predict the surges that appear in order to control their effect through the appropriate selection of overvoltage limiters and shield grounding.

Studies of overvoltages in cable screens.

  • Modeling and study of p.a.t. systems of insulated cables.
  • Studies in permanent and transitory regime.
  • Selection of voltage limiters.
  • Analysis of proposals to improve connections in cable screens.

Studies of overvoltages in GIS installations.

  • Modeling and study of overvoltages between GIS envelopes and insulated cable shields.
  • Studies in permanent and transitory regime.
  • Selection of GIS envelope voltage limiters.

Analysis and modeling of electrical systems. Isolation coordination studies.

  • Electric traction systems.
  • Studies of short-circuit and maneuvering regimes: temporary, transient and transient overvoltages of very high frequency.
  • Ferroresonance studies.

Modeling of components of electrical systems.

  • Development of advanced simulation models of insulated cables, transformers, GIS substations, lightning rods.
  • Models in the domain of frequency and time.