High-voltage substations must be able to handle electrical faults safely and effectively to protect people, animals, property, and the power supply. When a fault occurs in the substation or in the grid, the role of the protection system is to quickly identify the fault and disconnect the affected part of the installation, so the consequences are limited as much as possible. A correctly designed and configured protection system is therefore an essential part of any high-voltage installation.

L-Engineering works with the design, analysis, coordination and implementation of protection systems for both individual high-voltage installations and complex transmission and distribution networks. We provide advisory services for the protection of transformer substations, cable systems, overhead lines, generators, transformers, motors and industrial supply systems.

An effective protection system must not only detect faults quickly but also ensure selective disconnection so that only the faulted part of the installation is disconnected. This limits the impact on the rest of the power grid and reduces the risk of unnecessary outages. This places high demands on analysis, coordination, settings and testing of the protection systems.

For larger grid installations, we carry out detailed protection studies where different fault scenarios are analysed to ensure that the protection system operates correctly under relevant operating conditions. The results are used to define protection principles and settings that ensure fast fault clearance, correct selectivity and high security of supply.

We have experience with a wide range of protection solutions and relay manufacturers and can support the full process from initial analyses and design to configuration, testing and commissioning. Our goal is to create well-documented, selective and reliable protection systems that reduce the consequences of faults and support stable operation of the power grid for many years to come.