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High Voltage Disconnectors for Nuclear Power Plant Dukovany

Plzeň, Czech Republic, August 2020 – In July 2020, Czech installation company EGEM requested durable and reliable disconnectors with the voltage level of 420 kV, rated current of 4000 A and short-circuit current of 63 kA. R&S SERW will deliver the requested disconnectors to the end user ČEZ for the nuclear power plant substation in Dukovany, Czech Republic.

End user ČEZ, the biggest producer of energy in the Czech Republic, planned a reconstruction of the existing 420 kV substation. During the planning of the reconstruction, the company decided to replace the old disconnectors (type VOUI) with the new type of disconnectors.

The decision was based on the requirements to harmonize parameters with ČEPS. ČEPS is the main Transmission System Operator in the Czech Republic and uses R&S SERW disconnectors type 3SHJW-4240 (420 kV, 4000 A, 63 kA/1s, 160 kA). It is a new disconnector type with the high short-circuit capacity of 63 kA. Because of the increasing load of the grid, it is necessary to upgrade to a higher short-circuit capacity.

Some specifications of the project:

  • Horizontal disconnectors with two earthing switches
  • Type 3SHJW-4240
  • 420 kV, 4000 A, 63 kA/1s
  • 420 kV post insulators
  • Nuclear Power Plant Dukovany
  • Delivery from December 2020 to November 2021

In the future, it is expected that ČEZ will change the disconnectors in all plants to the higher short-circuit capability. It is the same approach which ČEPS is following.

About ČEZ
The Czech-based ČEZ Group is one of the largest energy companies in Europe. The company is responsible for the generation, distribution, trading, and sale of electricity and heat; trading and sale of natural gas; provision of comprehensive energy services from the new energy sector, and coal mining. With more than 8 million customers and over 32,000 employees, the company operates in Western, Central, and South-eastern Europe.

About EGEM
EGEM s.r.o. is a company from the Czech Republic that provides services to customers in the energy generation and distribution industry. The company focuses on comprehensive preparation, procurement, and implementation of energy works, including services and maintenance.

About R&S SERW
R&S SERW is part of the Swiss-based R&S Group, a leading provider of electrical infrastructure products in key markets. Founded in 1993 from the Skoda factory, R&S SERW has developed into one of the leading switching device manufacturers in Europe. Thanks to many years of experience in the field of power products with a focus on switching devices, R&S SERW is a competent and reliable partner for customers all over the world.