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For several decades HVDC technology was used primarily for point-to-point bulk power transmission. Although multi terminal HVDC systems are very few in numbers, it is expected that multiple HVDC links may be interconnected into HVDC transmission grids. Since every meshed grid requires reliable protection solution, an HVDC circuit breaker must be developed and introduced. Development of a working test...
Gas insulated switchgears (GIS) are playing an important role in today's power systems. These are being used in many transmission and distribution substations because of their compactness and durability. The basic insulation coordination levels are well defined in the international standards. The ratio of lightning impulse withstand voltage level to per unit voltage varies for different system voltages...
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