In early June 2016, three of the four phase-shifting transformers (PSTs) ordered by the Czech transmission system operator (TSO) and TSC member ČEPS were delivered to the northern Bohemian substation in Hradec u Kadaně. The delivery of the fourth and last custom-made PST has been delayed since the device did not pass the TSO’s acceptance tests at the Italian factory where it was built. “The safety of operation of the transmission system is the foremost priority for us,” explains Jan Kalina, Chairman of the ČEPS Board of Directors.
Despite the delay of the fourth PST, the ČEPS engineers are completing the installation of the already delivered machines according to the company’s schedule. The launching of the PSTs is expected in the first quarter of 2017 although the delivery date of the last transformer is still uncertain. Kalina points out that “the detected defect is being rectified at the factory” and that ČEPS is negotiating with the supplier.
The technically advanced PSTs with phase angle regulation are more complex than standard transformers. They are unique in Czechia and consist of two separate units in individual containers that are electrically connected. PSTs regulate the electrical power flow in electric networks. The new acquisitions will help ČEPS to attain the maximum electricity flow within the Czech transmission system without compromising on grid stability and supply security. On a European level, the operation of the ČEPS PSTs together with similar transformers operating at the German-Polish border will stabilise transnational electricity flows.
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