This paper is aimed at the propagation of discharges over a surface of insulator and the development of an analytical flashover model in air at atmospheric pressure. The experimental results show that the critical conditions of flashover are over the half of creeping distance.
Dimensionning of DC isulation is relatively complexe and need to take into account must more effects and parameters than in AC. This paper presents simulation methodology to applied for DC GIS and GIL.
In the future, Medium Frequency Transformers (MFT with a frequency range 5 kHz to 100 kHz) will be major components in DC-DC converter applications, for both Medium Voltage Direct Current (MVDC) and High Voltage Direct Current (HVDC) networks. Importantly, the corresponding power losses should be accurately calculated in order to reach performance targets (very high efficiency).
The paper focuses on the role of disconnectors for load transfer duties in the operation of MTDC meshed grids. As there are no topology existing today and no standard, some switching duties are presented for which disconnectors could act instead of using circuit breaker. Based on an empirical model relying on tests performed in air, severity of the different switching duties are presented and first conclusions are proposed.
In view of the increasing global market for high voltage (HV) vacuum circuit breakers in the voltage rating ≥ 72.5 kV, it is necessary to focus our attention on developing the vacuum interrupters (VIs) for these ratings. VCBs have already penetrated the 72.5 kV market and trials are progressing with introducing up to 145 kV VIs into the power networks. Prototype of the 252 kV VI has already been demonstrated.
Electricity networks of the future are moving towards supergrid networks. These networks will use HVDC voltage to supply center of consumption from sources that are far from them or to connect different countries together. The objective is to ensure network stability and security, especially with contribution renewable energies like large offshore wind farms and solar plants.
Electricity networks of the future are moving towards supergrid networks. These networks will use HVDC voltage to supply center of consumption from sources that are far from them or to connect different countries together. The objective is to ensure network stability and security, especially with contribution renewable energies like large offshore wind farms and solar plants.
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