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29 June 2004 - Finalizing a project that ran for 25 months, Siemens Power Transmission and Distribution (PTD) has handed over to the power supply company Transelectrica S.A. (with its head office in Bucharest, Romania) an air-insulated 400 kV outdoor turnkey substation. Located in the city of Oradea near the border with Hungary, the substation can be interconnected via the overhead line Bekescsaba leading to that country, thereby constituting the second link-up of the Romanian grid with the UCTE European interconnected network.
This turnkey project also included construction of a 110 kV outdoor substation, commissioned in September of last year. Siemens equipped the entire substation with numerical control and protection devices. The order is worth around � 22 million.
The Romanian Power Grid Company Transelectrica, the Electricity Transmission and System Operator of the National Power System, arranged for the construction - in Oradea near the frontier with Hungary - of an outdoor substation for the 110 kV and 400 kV voltage levels. As main contractor, Siemens was responsible for overall project execution and has now handed over the turnkey plant to the customer. Siemens commissioned the 16-bay 110 kV outdoor substation back in September 2003.
The substation in Oradea forms Romania's second 400 kV link with the UCTE European interconnected network. The stability of the entire Romanian network has consequently improved. The first connection with the European grid was established in 2001 via a Siemens substation in the city of Arad in western Romania.
For the 400 kV substation, Siemens supplied a total of five high-voltage circuit-breakers of type 3AP with spring stored energy mechanism. One of these 400 kV breakers is fitted with a synchronizer, enabling it to open or close a 100 MVAr reactor in synchronism with the network. The control and protection technology provided by Siemens comprises a redundant system with two hot-standby master units. The parameters for the numerical protective devices were remote-set. This can be performed at workstations in the control room and in the load dispatch center in Bucharest. The reliability of the overall substation is hereby enhanced.
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