Norway is in the forefront when it comes to national preparedness regulations for protection of power substations against EMI, electromagnetic interference, and EMP, electromagnetic pulses.
Since 2004, transmission system operator Statnett evaluates Roxtec EMC seals as one out of several tools for protection against threats such as HEMP, high-altitude electromagnetic pulse, and IEMI, intentional electromagnetic interference, in their power substations.
Terrorism, enemies in warfare and natural phenomena such as lightning count as threats to the power distribution. HEMP and IEMI incidents must not interfere with the transmission system. Norwegian preparedness regulations are strict to ensure safety – and a stop in the power supply would cost millions.
Sealing and shielding
Several transformer stations throughout the country are equipped with the Roxtec EMC system ES. According to Roxtec, the system combines sealing with electromagnetic shielding. The cable entries are tailor-made as huge boxes to ensure shielding but also to simplify installation – which can be seen as an example of how Roxtec provides technical support to cover customer needs.
Prepared for the future
Between 100 and 300 signal cables enter the control room through two boxes with Roxtec EMC transits under the raised floor. Roxtec has developed a solution making it possible to open the box covers and seals to add cables. Gunnar Svendsen appreciates this feature for the future:
"Our stations operate for typically 20-25 years, so we need to replace and add equipment."
80 Statnett transformer stations utilize the Roxtec EMC system.
Why use Roxtec?
- Certified protection
- Easy to use and install
- Customized solutions
- Flexibility for cables of different sizes
- Built-in spare capacity for future needs
Electromagnetic shielding of control rooms in transformer stations
Sealing of signal cables entering a shielded area
Customized EMC boxes with Roxtec EMC solutions (Roxtec ES transits)
Success stories within power
Taizhou ±800kV converter station, China
State Grid Corporation of China, SGCC, uses Roxtec BG™ solutions in their HVDC transmission projects.