Uncertainty Quantification for the Eulerian-Lagrangian simulation of evaporating sprays

2018-08-24T10:34:21+00:00July 26th, 2018|High Voltage Substation Equipment, Publications|

Evaporating sprays can be almost routinely simulated using an Eulerian-Lagrangian approach which relies on a RANS modeling of the continuous phase and a Lagrangian description of the discrete phase, including a turbulent dispersion model to express the effect of turbulent fluctuations within the carrier phase on the spray particles and an evaporation model for the spray droplets.

High Voltage Electrical Properties of Epoxy / h-BN Microcomposites

2018-08-22T09:40:27+00:00July 4th, 2018|High Voltage Substation Equipment, Publications|

Two high voltage properties – DC conductivity and AC breakdown strength – of epoxy composites filled with 30 wt% of micron sized hexagonal boron nitride (h-BN) are discussed in comparison to neat epoxy.

Design of a 4-Phase Intercell Transformer Converter for a Space Charge Measuring System

2018-09-03T10:00:15+00:00February 22nd, 2018|HVDC Cable Systems, Publications|

This paper presents the design of a power electronics converter to produce strong current pulses (about 400A) in the core of a HVDC cable in order to use the thermal step method to evaluate the ageing state of the dielectric component. The described converter uses a magnetic coupler with intercells transformers and is current controlled. Index Terms—magnetic coupler; intercell transformer; high current pulses; thermal step method; dielectrics.

Numerical investigations of ReBCO conductors with high limitation electric field for HVDC SFCL

2018-08-23T10:15:48+00:00February 14th, 2018|High Voltage Substation Equipment, Publications|

Superconducting fault current limiters (SFCL) are already in operation in alternative current medium voltage applications and their use in HVDC grids is very promising due to their capability of reducing high short-circuit currents.