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Advantages in Application-Design by using Direct-Light-Triggered Thyristors

In 1997, eupec manufactured his first direct-light- triggered 8kV thyristor with integrated protection functions. Since that time, eupec had sold more than 10000 LTTs in different sizes and with different blocking voltages. Direct-Light- Triggered Thyristors (LTT) have been developed for High Voltage Direct Current (HVDC) transmission applications because of the considerable advantage of high voltage blocking and the easy way of light triggering. Several protection functions were integrated in the LTT. Therefore that expensive and sensitive electronic components which are usually necessary for the external protection of electrically triggered thyristors (ETT) are dispensable. LTTs are in use in applications with high voltage where a series connection of thyristors is required. Typical examples are HVDC installations, Static VAR Compensation (SVC), converters and soft starters for medium voltage drives and various pulse power applications. To show the performance of LTTs it is important to have a closer look at the system costs and the reliability. In applications with high voltages and series connection, the LTT offers advantages because less electronics operating on high potential are required. This reduces the costs and improves the reliability of the system.

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• Feb 11, 2014