Grid protection

Protection calculations

Protection technology in electrical grids has the task of switching off faults quickly, safely and as selectively as possible. This is the prerequisite for ensuring personal, fire and property protection and also for maintaining the power supply for network areas not affected by the fault. In order to meet the above-mentioned requirements, the settings of the protective devices and their coordination must be adapted to the respective conditions on site. Suitable settings can be determined by means of protection calculations which, among other things, make use of load flow calculations and short-circuit current calculations according to the specifications of DIN EN 60909-0 / VDE 0102. On this basis, we determine optimised protection settings for all types of UMZ/AMZ, distance and differential protection relays. The documentation of the calculations and resulting protective characteristics of the network is done via graphical representations (current-time diagrams, staggered diagrams) and/or a tabular summary of the specified protection setting values.
Distance protection relay plan
Current-time diagram

Protection concept

The coordination of several protection devices in a grid for fast, safe and selective fault handling is called a protection concept. Our activities in this area range from the review of the existing grid protection concept, cover its selective optimisation and end with the complete creation of a new protection concept, e.g. for new systems and grids or in the case of serious deficiencies in the existing protection concept. In doing so, we generally try to take up the often tried-and-tested protection philosophy of the plant or grid operator and, if necessary, develop it further. In addition, we are happy to advise you in connection with the protection-related detection, location and treatment of earth faults.
Optimized protection concept for an industrial network


Patrik Schorn
Project Engineer Electrical power engineering