The last of four PSTs arrived in Czechia


For the Bohemian substation in Hradec u Kadaně, a set of altogether four high performing phase-shifting transformers (PSTs) was ordered by Czech transmission system operator (TSO) and TSC member ČEPS. The PSTs are intended for establishing two new interconnectors between the Czech transmission grid and the transmission system in the eastern part of Germany operated by further TSC member 50Hertz. Three of the PSTs reached Czechia in June 2016, but unfortunately the delivery of the fourth was delayed due to not passing the ČEPS acceptance tests. Now it finally has arrived in Hradec u Kadaně, and ČEPS expects all four of the PSTs to be in full operation by the end of June.

Two of the technically advanced PSTs with phase angle regulation have already been commissioned in January 2017, regulating the electricity flow on the first interconnector ever since. “The partial commissioning helped minimise the use of expensive emergency corrective measures,” explains Jan Kalina, Chairman of the ČEPS Board of Directors. The PSTs allow ČEPS to transfer the maximum amount of electricity without compromising on the supply security. In combination with similar devices on the other side of the Czech-German and at the Polish-German border, the PSTs will ensure the stability of the transmission grid and of transit electricity flows in East-Central Europe.

The total investment costs for the PSTs including all the necessary supplementary measures amount to a maximum of CZK 2bn (about €74m). Jan Kalina comments on this considerable large investment: “The costs for the construction of these transformers are high, but a possible widespread power failure in the transmission system would cause far greater damage.”

> See ČEPS press release (html)


The last of four PSTs arrived in Czechia