1 Reliability Enhancement of HVDC Transmission by Standardization of Thyristor Valves and Valve Testing

Abstract ⎯ After more than thirty years development bulk power transmission by means of HVDC thyristor valves has become an industry standard. Concept of standard thyristor valve design has been adopted in many HVDC projects for reliability enhancement in recent years. Choosing of standard components, using well-proven design structure and rigours valve design verification program and test circuit are the three most important aspects for thyristor valve standardization. Statistics has shown a significant decreased outage rate of thyristor valves after the implementation of valve design standardization. Index Terms ⎯ HVDC transmission, HVDC thyristor valves, design standardization, reliabilit