Redundancy and ring structure
The high-voltage transmission grid is designed so that parts of the network can be switched off for scheduled maintenance without impacting the electricity supply for our users. Certain grid components are serviced in this way every week .
Our transmission system has redundancy built in. This means the critical components are duplicated: there are two circuits for each high-voltage connection and extra transformers in the high-voltage substations. This redundancy allows us to continue transmitting electricity while we are doing maintenance work.
In addition, the grid is structured in a ring shape. If there is a disruption somewhere, we can reroute the electricity along an alternative path.
We only carry out maintenance work when the availability of the transmission grid permits this. We therefore have a coordinated plan for carrying out preventive maintenance work, so we are sure the system can also cope with any unscheduled disruptions during the planned service outages. We determine beforehand whether it is safe to proceed with the scheduled maintenance.
The safety of our employees during maintenance work is paramount. That is why it takes several people to shut down parts of the high-voltage grid and everyone involved has to follow strict procedures and wear protective clothing.