Expertise in action: a project case
The Netherlands has around 110,000 km of underground medium-voltage (6-50 kV) cables, some of which date back to the early 1900s. Problems in underground cables are the biggest cause of power outages. In order to ensure a reliable energy supply, Distribution System Operators (DSOs) require a fast and accurate way of monitoring all their cables.
In early 2000, Dutch DSOs teamed up with DNV GL to develop a 24-hour cable monitoring system that can guard MV cables while these are in service (online). The solution is DNV GL’s Smart Cable Guard®*: a sensor-based solution for pinpointing faults and weak points in cables. DNV GL manages and monitors the system, analyzing sensor data to allow the DSOs to resolve problems fast.
Following successful testing, all Dutch DSOs, have rolled out the cable monitoring system across their networks.
The system is up to 70% more effective than previous failure detectors. Its accuracy means faults can be repaired faster and weak points are easier to identify, helping to prevent future faults.
The added value
It is forecasted by several DSOs that after a widespread roll out, power outages and the related outage time on their network can be reduced by around 25%. Time and cost of repairing failures is also predicted to fall considerably as well.
*Smart Cable Guard is registered under the trade mark name KEMA Smart Cable Guard®