Simulation of arc models with the block modelling method

Simulation of current interruption is currently performed with non-ideal switching devices for large power systems. Nevertheless, for small networks, non-ideal switching devices can be substituted by arc models. However, this substitution has a negative impact on the computation time. At the same time, these simulations are useful to design...

Cross-bonding cable and box model based on pulse reflection measurement

Transients from lightning strikes can enter underground cables at overhead line to power cable transitions. Possible overvoltages on these surges at cross-bonding connections of the cable screens are of major concern. A model is developed for modelling overvoltages from transient signal propagation through a combined cross-bonding cable and box....

Transients in power systems: A literature survey

Lightning Induced Overvoltages in Mixed 380 kV OHL-Cable-OHL connections

Transmission of electric energy at high voltage levels is mainly performed by overhead lines. Nowadays, an increasing amount of power grid operators are replacing overhead transmission lines by underground cables. Cable presence in power systems may have consequences for the behavior of the total system, since cables have much larger capacitance...

Scalable Newton-Krylov solver for very large power flow problems

The power flow problem is generally solved by the Newton-Raphson method with a sparse direct solver for the linear system of equations in each iteration. While this works fine for small power flow problems, we will show that for very large problems the direct solver is very slow and we present alternatives that scale much better in the problem...

Experimental and theoretical analysis of vacuum circuit breaker prestrike effect on a transformer

The work presented in this paper deals with the investigation of circuit breaker prestrike effect that occurs during energizing a distribution transformer. An experimental test setup that consists of a supply transformer, a vacuum circuit breaker (VCB), a cable and a test transformer is built, and the prestrikes in the VCB are recorded. The test...

Application of Hybrid Modeling for Calculating Interturn Voltages in Transformer Windings

This letter deals with the hybrid modeling of transformers and the determination of interturn voltage distribution in transformers with layer-type windings. The hybrid model uses a combination of a multiconductor transmission-line model and a single transmission-line model. The good agreement between computed and measured voltage waveforms shows...

Transient stability analysis of a distribution network with distributed generators

This letter describes the transient stability analysis of a 10-kV distribution network with wind generators, microturbines, and CHP plants. The network being modeled in Matlab/Simulink takes into account detailed dynamic models of the generators. Fault simulations at various locations are investigated. For the studied cases, the critical...

Molecular simulation strategy for mechanical modeling of amorphous/porous low-dielectric constant materials

We propose an amorphous/porous molecular connection network generation algorithm for simulating the material stiffness of a low-k material (SiOC:H). Based on a given concentration of the basic building blocks, this algorithm will generate an approximate and large amorphous network. The molecular topology is obtained by distributing these blocks...

Digital metering of power components according to IEEE Standard 1459-2000 using the Newton-type algorithm

Analysis of very fast transients in layer-type transformer windings

Stochastic assessment of opportunities for wind power curtailment

Estimation of power system variability due to wind power

The incorporation of wind power generation to the power system leads to an increase in the variability of the system power flows. The assessment of this variability is necessary for the planning of the necessary system reinforcements. For the assessment of this variability, the uncertainty in the system inputs should be modeled, comprising of...

Vacuum circuit creaker postarc current modelling based on the theory of Langmuir probes

Modelling, simulation and measurement of fast transients in transformer windings with consideration of frequency-depent losses

Discussion of "Efficient method to compute transfer function of a transformer from eq. circuit"

The Application of Super Capacitors to relieve Battery-storage systems in Autonomous Renewable Energy Systems

A Comparison between Three Tools for Electrical Transient Computations